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gstreamer/gst/playback/gstdecodebin2.c
Sebastian Dröge c49531f1b7 decodebin: Let serialize queries before caps events through 
Otherwise we're going to deadlock forever because no autoplugging
happens without having caps, but caps can never be send because
we're blocking.

Serialized queries before caps should never be sent unless really
necessary.
2013-06-06 15:57:49 +02:00

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/* GStreamer
* Copyright (C) <2006> Edward Hervey <edward@fluendo.com>
* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
* Copyright (C) <2011> Hewlett-Packard Development Company, L.P.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
* Copyright (C) <2013> Collabora Ltd.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-decodebin
*
* #GstBin that auto-magically constructs a decoding pipeline using available
* decoders and demuxers via auto-plugging.
*
* decodebin is considered stable now and replaces the old #decodebin element.
* #uridecodebin uses decodebin internally and is often more convenient to
* use, as it creates a suitable source element as well.
*/
/* Implementation notes:
*
* The following section describes how decodebin works internally.
*
* The first part of decodebin is its typefind element, which tries
* to determine the media type of the input stream. If the type is found
* autoplugging starts.
*
* decodebin internally organizes the elements it autoplugged into GstDecodeChains
* and GstDecodeGroups. A decode chain is a single chain of decoding, this
* means that if decodebin every autoplugs an element with two+ srcpads
* (e.g. a demuxer) this will end the chain and everything following this
* demuxer will be put into decode groups below the chain. Otherwise,
* if an element has a single srcpad that outputs raw data the decode chain
* is ended too and a GstDecodePad is stored and blocked.
*
* A decode group combines a number of chains that are created by a
* demuxer element. All those chains are connected through a multiqueue to
* the demuxer. A new group for the same demuxer is only created if the
* demuxer has signaled no-more-pads, in which case all following pads
* create a new chain in the new group.
*
* This continues until the top-level decode chain is complete. A decode
* chain is complete if it either ends with a blocked endpad, if autoplugging
* stopped because no suitable plugins could be found or if the active group
* is complete. A decode group on the other hand is complete if all child
* chains are complete.
*
* If this happens at some point, all endpads of all active groups are exposed.
* For this decodebin adds the endpads, signals no-more-pads and then unblocks
* them. Now playback starts.
*
* If one of the chains that end on a endpad receives EOS decodebin checks
* if all chains and groups are drained. In that case everything goes into EOS.
* If there is a chain where the active group is drained but there exist next
* groups, the active group is hidden (endpads are removed) and the next group
* is exposed. This means that in some cases more pads may be created even
* after the initial no-more-pads signal. This happens for example with
* so-called "chained oggs", most commonly found among ogg/vorbis internet
* radio streams.
*
* Note 1: If we're talking about blocked endpads this really means that the
* *target* pads of the endpads are blocked. Pads that are exposed to the outside
* should never ever be blocked!
*
* Note 2: If a group is complete and the parent's chain demuxer adds new pads
* but never signaled no-more-pads this additional pads will be ignored!
*
*/
/* FIXME 0.11: suppress warnings for deprecated API such as GValueArray
* with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst-i18n-plugin.h>
#include <string.h>
#include <gst/gst.h>
#include <gst/pbutils/pbutils.h>
#include "gstplay-enum.h"
#include "gstplayback.h"
#include "gstrawcaps.h"
/* Also used by gsturidecodebin.c */
gint _decode_bin_compare_factories_func (gconstpointer p1, gconstpointer p2);
/* generic templates */
static GstStaticPadTemplate decoder_bin_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate decoder_bin_src_template =
GST_STATIC_PAD_TEMPLATE ("src_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_decode_bin_debug);
#define GST_CAT_DEFAULT gst_decode_bin_debug
typedef struct _GstPendingPad GstPendingPad;
typedef struct _GstDecodeElement GstDecodeElement;
typedef struct _GstDecodeChain GstDecodeChain;
typedef struct _GstDecodeGroup GstDecodeGroup;
typedef struct _GstDecodePad GstDecodePad;
typedef GstGhostPadClass GstDecodePadClass;
typedef struct _GstDecodeBin GstDecodeBin;
typedef struct _GstDecodeBinClass GstDecodeBinClass;
#define GST_TYPE_DECODE_BIN (gst_decode_bin_get_type())
#define GST_DECODE_BIN_CAST(obj) ((GstDecodeBin*)(obj))
#define GST_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DECODE_BIN,GstDecodeBin))
#define GST_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DECODE_BIN,GstDecodeBinClass))
#define GST_IS_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DECODE_BIN))
#define GST_IS_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DECODE_BIN))
/**
* GstDecodeBin:
*
* The opaque #GstDecodeBin data structure
*/
struct _GstDecodeBin
{
GstBin bin; /* we extend GstBin */
/* properties */
GstCaps *caps; /* caps on which to stop decoding */
gchar *encoding; /* encoding of subtitles */
gboolean use_buffering; /* configure buffering on multiqueues */
gint low_percent;
gint high_percent;
guint max_size_bytes;
guint max_size_buffers;
guint64 max_size_time;
gboolean post_stream_topology;
guint64 connection_speed;
GstElement *typefind; /* this holds the typefind object */
GMutex expose_lock; /* Protects exposal and removal of groups */
GstDecodeChain *decode_chain; /* Top level decode chain */
guint nbpads; /* unique identifier for source pads */
GMutex factories_lock;
guint32 factories_cookie; /* Cookie from last time when factories was updated */
GList *factories; /* factories we can use for selecting elements */
GMutex subtitle_lock; /* Protects changes to subtitles and encoding */
GList *subtitles; /* List of elements with subtitle-encoding,
* protected by above mutex! */
gboolean have_type; /* if we received the have_type signal */
guint have_type_id; /* signal id for have-type from typefind */
gboolean async_pending; /* async-start has been emitted */
GMutex dyn_lock; /* lock protecting pad blocking */
gboolean shutdown; /* if we are shutting down */
GList *blocked_pads; /* pads that have set to block */
gboolean expose_allstreams; /* Whether to expose unknow type streams or not */
GList *filtered; /* elements for which error messages are filtered */
};
struct _GstDecodeBinClass
{
GstBinClass parent_class;
/* signal fired when we found a pad that we cannot decode */
void (*unknown_type) (GstElement * element, GstPad * pad, GstCaps * caps);
/* signal fired to know if we continue trying to decode the given caps */
gboolean (*autoplug_continue) (GstElement * element, GstPad * pad,
GstCaps * caps);
/* signal fired to get a list of factories to try to autoplug */
GValueArray *(*autoplug_factories) (GstElement * element, GstPad * pad,
GstCaps * caps);
/* signal fired to sort the factories */
GValueArray *(*autoplug_sort) (GstElement * element, GstPad * pad,
GstCaps * caps, GValueArray * factories);
/* signal fired to select from the proposed list of factories */
GstAutoplugSelectResult (*autoplug_select) (GstElement * element,
GstPad * pad, GstCaps * caps, GstElementFactory * factory);
/* signal fired when a autoplugged element that is not linked downstream
* or exposed wants to query something */
gboolean (*autoplug_query) (GstElement * element, GstPad * pad,
GstQuery * query);
/* fired when the last group is drained */
void (*drained) (GstElement * element);
};
/* signals */
enum
{
SIGNAL_UNKNOWN_TYPE,
SIGNAL_AUTOPLUG_CONTINUE,
SIGNAL_AUTOPLUG_FACTORIES,
SIGNAL_AUTOPLUG_SELECT,
SIGNAL_AUTOPLUG_SORT,
SIGNAL_AUTOPLUG_QUERY,
SIGNAL_DRAINED,
LAST_SIGNAL
};
/* automatic sizes, while prerolling we buffer up to 2MB, we ignore time
* and buffers in this case. */
#define AUTO_PREROLL_SIZE_BYTES 2 * 1024 * 1024
#define AUTO_PREROLL_SIZE_BUFFERS 0
#define AUTO_PREROLL_NOT_SEEKABLE_SIZE_TIME 10 * GST_SECOND
#define AUTO_PREROLL_SEEKABLE_SIZE_TIME 0
/* whan playing, keep a max of 2MB of data but try to keep the number of buffers
* as low as possible (try to aim for 5 buffers) */
#define AUTO_PLAY_SIZE_BYTES 2 * 1024 * 1024
#define AUTO_PLAY_SIZE_BUFFERS 5
#define AUTO_PLAY_SIZE_TIME 0
#define DEFAULT_SUBTITLE_ENCODING NULL
#define DEFAULT_USE_BUFFERING FALSE
#define DEFAULT_LOW_PERCENT 10
#define DEFAULT_HIGH_PERCENT 99
/* by default we use the automatic values above */
#define DEFAULT_MAX_SIZE_BYTES 0
#define DEFAULT_MAX_SIZE_BUFFERS 0
#define DEFAULT_MAX_SIZE_TIME 0
#define DEFAULT_POST_STREAM_TOPOLOGY FALSE
#define DEFAULT_EXPOSE_ALL_STREAMS TRUE
#define DEFAULT_CONNECTION_SPEED 0
/* Properties */
enum
{
PROP_0,
PROP_CAPS,
PROP_SUBTITLE_ENCODING,
PROP_SINK_CAPS,
PROP_USE_BUFFERING,
PROP_LOW_PERCENT,
PROP_HIGH_PERCENT,
PROP_MAX_SIZE_BYTES,
PROP_MAX_SIZE_BUFFERS,
PROP_MAX_SIZE_TIME,
PROP_POST_STREAM_TOPOLOGY,
PROP_EXPOSE_ALL_STREAMS,
PROP_CONNECTION_SPEED,
PROP_LAST
};
static GstBinClass *parent_class;
static guint gst_decode_bin_signals[LAST_SIGNAL] = { 0 };
static GstStaticCaps default_raw_caps = GST_STATIC_CAPS (DEFAULT_RAW_CAPS);
static void do_async_start (GstDecodeBin * dbin);
static void do_async_done (GstDecodeBin * dbin);
static void type_found (GstElement * typefind, guint probability,
GstCaps * caps, GstDecodeBin * decode_bin);
static void decodebin_set_queue_size (GstDecodeBin * dbin,
GstElement * multiqueue, gboolean preroll, gboolean seekable);
static gboolean gst_decode_bin_autoplug_continue (GstElement * element,
GstPad * pad, GstCaps * caps);
static GValueArray *gst_decode_bin_autoplug_factories (GstElement *
element, GstPad * pad, GstCaps * caps);
static GValueArray *gst_decode_bin_autoplug_sort (GstElement * element,
GstPad * pad, GstCaps * caps, GValueArray * factories);
static GstAutoplugSelectResult gst_decode_bin_autoplug_select (GstElement *
element, GstPad * pad, GstCaps * caps, GstElementFactory * factory);
static gboolean gst_decode_bin_autoplug_query (GstElement * element,
GstPad * pad, GstQuery * query);
static void gst_decode_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_decode_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_decode_bin_set_caps (GstDecodeBin * dbin, GstCaps * caps);
static GstCaps *gst_decode_bin_get_caps (GstDecodeBin * dbin);
static void caps_notify_cb (GstPad * pad, GParamSpec * unused,
GstDecodeChain * chain);
static GstPad *find_sink_pad (GstElement * element);
static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element,
GstStateChange transition);
static void gst_decode_bin_handle_message (GstBin * bin, GstMessage * message);
static gboolean check_upstream_seekable (GstDecodeBin * dbin, GstPad * pad);
#define EXPOSE_LOCK(dbin) G_STMT_START { \
GST_LOG_OBJECT (dbin, \
"expose locking from thread %p", \
g_thread_self ()); \
g_mutex_lock (&GST_DECODE_BIN_CAST(dbin)->expose_lock); \
GST_LOG_OBJECT (dbin, \
"expose locked from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define EXPOSE_UNLOCK(dbin) G_STMT_START { \
GST_LOG_OBJECT (dbin, \
"expose unlocking from thread %p", \
g_thread_self ()); \
g_mutex_unlock (&GST_DECODE_BIN_CAST(dbin)->expose_lock); \
} G_STMT_END
#define DYN_LOCK(dbin) G_STMT_START { \
GST_LOG_OBJECT (dbin, \
"dynlocking from thread %p", \
g_thread_self ()); \
g_mutex_lock (&GST_DECODE_BIN_CAST(dbin)->dyn_lock); \
GST_LOG_OBJECT (dbin, \
"dynlocked from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define DYN_UNLOCK(dbin) G_STMT_START { \
GST_LOG_OBJECT (dbin, \
"dynunlocking from thread %p", \
g_thread_self ()); \
g_mutex_unlock (&GST_DECODE_BIN_CAST(dbin)->dyn_lock); \
} G_STMT_END
#define SUBTITLE_LOCK(dbin) G_STMT_START { \
GST_LOG_OBJECT (dbin, \
"subtitle locking from thread %p", \
g_thread_self ()); \
g_mutex_lock (&GST_DECODE_BIN_CAST(dbin)->subtitle_lock); \
GST_LOG_OBJECT (dbin, \
"subtitle lock from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define SUBTITLE_UNLOCK(dbin) G_STMT_START { \
GST_LOG_OBJECT (dbin, \
"subtitle unlocking from thread %p", \
g_thread_self ()); \
g_mutex_unlock (&GST_DECODE_BIN_CAST(dbin)->subtitle_lock); \
} G_STMT_END
struct _GstPendingPad
{
GstPad *pad;
GstDecodeChain *chain;
gulong event_probe_id;
gulong notify_caps_id;
};
struct _GstDecodeElement
{
GstElement *element;
GstElement *capsfilter; /* Optional capsfilter for Parser/Convert */
gulong pad_added_id;
gulong pad_removed_id;
gulong no_more_pads_id;
};
/* GstDecodeGroup
*
* Streams belonging to the same group/chain of a media file
*
* When changing something here lock the parent chain!
*/
struct _GstDecodeGroup
{
GstDecodeBin *dbin;
GstDecodeChain *parent;
GstElement *multiqueue; /* Used for linking all child chains */
gulong overrunsig; /* the overrun signal for multiqueue */
gboolean overrun; /* TRUE if the multiqueue signaled overrun. This
* means that we should really expose the group */
gboolean no_more_pads; /* TRUE if the demuxer signaled no-more-pads */
gboolean drained; /* TRUE if the all children are drained */
GList *children; /* List of GstDecodeChains in this group */
GList *reqpads; /* List of RequestPads for multiqueue, there is
* exactly one RequestPad per child chain */
};
struct _GstDecodeChain
{
GstDecodeGroup *parent;
GstDecodeBin *dbin;
GMutex lock; /* Protects this chain and its groups */
GstPad *pad; /* srcpad that caused creation of this chain */
gboolean drained; /* TRUE if the all children are drained */
gboolean demuxer; /* TRUE if elements->data is a demuxer */
gboolean seekable; /* TRUE if this chain ends on a demuxer and is seekable */
GList *elements; /* All elements in this group, first
is the latest and most downstream element */
/* Note: there are only groups if the last element of this chain
* is a demuxer, otherwise the chain will end with an endpad.
* The other way around this means, that endpad only exists if this
* chain doesn't end with a demuxer! */
GstDecodeGroup *active_group; /* Currently active group */
GList *next_groups; /* head is newest group, tail is next group.
a new group will be created only if the head
group had no-more-pads. If it's only exposed
all new pads will be ignored! */
GList *pending_pads; /* Pads that have no fixed caps yet */
GstDecodePad *current_pad; /* Current ending pad of the chain that can't
* be exposed yet but would be the same as endpad
* once it can be exposed */
GstDecodePad *endpad; /* Pad of this chain that could be exposed */
gboolean deadend; /* This chain is incomplete and can't be completed,
e.g. no suitable decoder could be found
e.g. stream got EOS without buffers
*/
GstCaps *endcaps; /* Caps that were used when linking to the endpad
or that resulted in the deadend
*/
/* FIXME: This should be done directly via a thread! */
GList *old_groups; /* Groups that should be freed later */
};
static void gst_decode_chain_free (GstDecodeChain * chain);
static GstDecodeChain *gst_decode_chain_new (GstDecodeBin * dbin,
GstDecodeGroup * group, GstPad * pad);
static void gst_decode_group_hide (GstDecodeGroup * group);
static void gst_decode_group_free (GstDecodeGroup * group);
static GstDecodeGroup *gst_decode_group_new (GstDecodeBin * dbin,
GstDecodeChain * chain);
static gboolean gst_decode_chain_is_complete (GstDecodeChain * chain);
static gboolean gst_decode_chain_expose (GstDecodeChain * chain,
GList ** endpads, gboolean * missing_plugin);
static gboolean gst_decode_chain_is_drained (GstDecodeChain * chain);
static gboolean gst_decode_chain_reset_buffering (GstDecodeChain * chain);
static gboolean gst_decode_group_is_complete (GstDecodeGroup * group);
static GstPad *gst_decode_group_control_demuxer_pad (GstDecodeGroup * group,
GstPad * pad);
static gboolean gst_decode_group_is_drained (GstDecodeGroup * group);
static gboolean gst_decode_group_reset_buffering (GstDecodeGroup * group);
static gboolean gst_decode_bin_expose (GstDecodeBin * dbin);
static void gst_decode_bin_reset_buffering (GstDecodeBin * dbin);
#define CHAIN_MUTEX_LOCK(chain) G_STMT_START { \
GST_LOG_OBJECT (chain->dbin, \
"locking chain %p from thread %p", \
chain, g_thread_self ()); \
g_mutex_lock (&chain->lock); \
GST_LOG_OBJECT (chain->dbin, \
"locked chain %p from thread %p", \
chain, g_thread_self ()); \
} G_STMT_END
#define CHAIN_MUTEX_UNLOCK(chain) G_STMT_START { \
GST_LOG_OBJECT (chain->dbin, \
"unlocking chain %p from thread %p", \
chain, g_thread_self ()); \
g_mutex_unlock (&chain->lock); \
} G_STMT_END
/* GstDecodePad
*
* GstPad private used for source pads of chains
*/
struct _GstDecodePad
{
GstGhostPad parent;
GstDecodeBin *dbin;
GstDecodeChain *chain;
gboolean blocked; /* the *target* pad is blocked */
gboolean exposed; /* the pad is exposed */
gboolean drained; /* an EOS has been seen on the pad */
gulong block_id;
};
GType gst_decode_pad_get_type (void);
G_DEFINE_TYPE (GstDecodePad, gst_decode_pad, GST_TYPE_GHOST_PAD);
#define GST_TYPE_DECODE_PAD (gst_decode_pad_get_type ())
#define GST_DECODE_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DECODE_PAD,GstDecodePad))
static GstDecodePad *gst_decode_pad_new (GstDecodeBin * dbin,
GstDecodeChain * chain);
static void gst_decode_pad_activate (GstDecodePad * dpad,
GstDecodeChain * chain);
static void gst_decode_pad_unblock (GstDecodePad * dpad);
static void gst_decode_pad_set_blocked (GstDecodePad * dpad, gboolean blocked);
static gboolean gst_decode_pad_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static void gst_pending_pad_free (GstPendingPad * ppad);
static GstPadProbeReturn pad_event_cb (GstPad * pad, GstPadProbeInfo * info,
gpointer data);
/********************************
* Standard GObject boilerplate *
********************************/
static void gst_decode_bin_class_init (GstDecodeBinClass * klass);
static void gst_decode_bin_init (GstDecodeBin * decode_bin);
static void gst_decode_bin_dispose (GObject * object);
static void gst_decode_bin_finalize (GObject * object);
static GType
gst_decode_bin_get_type (void)
{
static GType gst_decode_bin_type = 0;
if (!gst_decode_bin_type) {
static const GTypeInfo gst_decode_bin_info = {
sizeof (GstDecodeBinClass),
NULL,
NULL,
(GClassInitFunc) gst_decode_bin_class_init,
NULL,
NULL,
sizeof (GstDecodeBin),
0,
(GInstanceInitFunc) gst_decode_bin_init,
NULL
};
gst_decode_bin_type =
g_type_register_static (GST_TYPE_BIN, "GstDecodeBin",
&gst_decode_bin_info, 0);
}
return gst_decode_bin_type;
}
static gboolean
_gst_boolean_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
gboolean myboolean;
myboolean = g_value_get_boolean (handler_return);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_boolean (return_accu, myboolean);
/* stop emission if FALSE */
return myboolean;
}
static gboolean
_gst_boolean_or_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
gboolean myboolean;
gboolean retboolean;
myboolean = g_value_get_boolean (handler_return);
retboolean = g_value_get_boolean (return_accu);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_boolean (return_accu, myboolean || retboolean);
return TRUE;
}
/* we collect the first result */
static gboolean
_gst_array_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
gpointer array;
array = g_value_get_boxed (handler_return);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_boxed (return_accu, array);
return FALSE;
}
static gboolean
_gst_select_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
GstAutoplugSelectResult res;
res = g_value_get_enum (handler_return);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_enum (return_accu, res);
return FALSE;
}
static gboolean
_gst_array_hasvalue_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
gpointer array;
array = g_value_get_boxed (handler_return);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_boxed (return_accu, array);
if (array != NULL)
return FALSE;
return TRUE;
}
static void
gst_decode_bin_class_init (GstDecodeBinClass * klass)
{
GObjectClass *gobject_klass;
GstElementClass *gstelement_klass;
GstBinClass *gstbin_klass;
gobject_klass = (GObjectClass *) klass;
gstelement_klass = (GstElementClass *) klass;
gstbin_klass = (GstBinClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_klass->dispose = gst_decode_bin_dispose;
gobject_klass->finalize = gst_decode_bin_finalize;
gobject_klass->set_property = gst_decode_bin_set_property;
gobject_klass->get_property = gst_decode_bin_get_property;
/**
* GstDecodeBin::unknown-type:
* @bin: The decodebin.
* @pad: The new pad containing caps that cannot be resolved to a 'final'
* stream type.
* @caps: The #GstCaps of the pad that cannot be resolved.
*
* This signal is emitted when a pad for which there is no further possible
* decoding is added to the decodebin.
*/
gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE] =
g_signal_new ("unknown-type", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, unknown_type),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstDecodeBin::autoplug-continue:
* @bin: The decodebin.
* @pad: The #GstPad.
* @caps: The #GstCaps found.
*
* This signal is emitted whenever decodebin finds a new stream. It is
* emitted before looking for any elements that can handle that stream.
*
* <note>
* Invocation of signal handlers stops after the first signal handler
* returns #FALSE. Signal handlers are invoked in the order they were
* connected in.
* </note>
*
* Returns: #TRUE if you wish decodebin to look for elements that can
* handle the given @caps. If #FALSE, those caps will be considered as
* final and the pad will be exposed as such (see 'pad-added' signal of
* #GstElement).
*/
gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE] =
g_signal_new ("autoplug-continue", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_continue),
_gst_boolean_accumulator, NULL, g_cclosure_marshal_generic,
G_TYPE_BOOLEAN, 2, GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstDecodeBin::autoplug-factories:
* @bin: The decodebin.
* @pad: The #GstPad.
* @caps: The #GstCaps found.
*
* This function is emited when an array of possible factories for @caps on
* @pad is needed. Decodebin will by default return an array with all
* compatible factories, sorted by rank.
*
* If this function returns NULL, @pad will be exposed as a final caps.
*
* If this function returns an empty array, the pad will be considered as
* having an unhandled type media type.
*
* <note>
* Only the signal handler that is connected first will ever by invoked.
* Don't connect signal handlers with the #G_CONNECT_AFTER flag to this
* signal, they will never be invoked!
* </note>
*
* Returns: a #GValueArray* with a list of factories to try. The factories are
* by default tried in the returned order or based on the index returned by
* "autoplug-select".
*/
gst_decode_bin_signals[SIGNAL_AUTOPLUG_FACTORIES] =
g_signal_new ("autoplug-factories", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass,
autoplug_factories), _gst_array_accumulator, NULL,
g_cclosure_marshal_generic, G_TYPE_VALUE_ARRAY, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstDecodeBin::autoplug-sort:
* @bin: The decodebin.
* @pad: The #GstPad.
* @caps: The #GstCaps.
* @factories: A #GValueArray of possible #GstElementFactory to use.
*
* Once decodebin has found the possible #GstElementFactory objects to try
* for @caps on @pad, this signal is emited. The purpose of the signal is for
* the application to perform additional sorting or filtering on the element
* factory array.
*
* The callee should copy and modify @factories or return #NULL if the
* order should not change.
*
* <note>
* Invocation of signal handlers stops after one signal handler has
* returned something else than #NULL. Signal handlers are invoked in
* the order they were connected in.
* Don't connect signal handlers with the #G_CONNECT_AFTER flag to this
* signal, they will never be invoked!
* </note>
*
* Returns: A new sorted array of #GstElementFactory objects.
*/
gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT] =
g_signal_new ("autoplug-sort", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_sort),
_gst_array_hasvalue_accumulator, NULL,
g_cclosure_marshal_generic, G_TYPE_VALUE_ARRAY, 3, GST_TYPE_PAD,
GST_TYPE_CAPS, G_TYPE_VALUE_ARRAY | G_SIGNAL_TYPE_STATIC_SCOPE);
/**
* GstDecodeBin::autoplug-select:
* @bin: The decodebin.
* @pad: The #GstPad.
* @caps: The #GstCaps.
* @factory: A #GstElementFactory to use.
*
* This signal is emitted once decodebin has found all the possible
* #GstElementFactory that can be used to handle the given @caps. For each of
* those factories, this signal is emitted.
*
* The signal handler should return a #GST_TYPE_AUTOPLUG_SELECT_RESULT enum
* value indicating what decodebin should do next.
*
* A value of #GST_AUTOPLUG_SELECT_TRY will try to autoplug an element from
* @factory.
*
* A value of #GST_AUTOPLUG_SELECT_EXPOSE will expose @pad without plugging
* any element to it.
*
* A value of #GST_AUTOPLUG_SELECT_SKIP will skip @factory and move to the
* next factory.
*
* <note>
* Only the signal handler that is connected first will ever by invoked.
* Don't connect signal handlers with the #G_CONNECT_AFTER flag to this
* signal, they will never be invoked!
* </note>
*
* Returns: a #GST_TYPE_AUTOPLUG_SELECT_RESULT that indicates the required
* operation. the default handler will always return
* #GST_AUTOPLUG_SELECT_TRY.
*/
gst_decode_bin_signals[SIGNAL_AUTOPLUG_SELECT] =
g_signal_new ("autoplug-select", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_select),
_gst_select_accumulator, NULL,
g_cclosure_marshal_generic,
GST_TYPE_AUTOPLUG_SELECT_RESULT, 3, GST_TYPE_PAD, GST_TYPE_CAPS,
GST_TYPE_ELEMENT_FACTORY);
/**
* GstDecodeBin::autoplug-query:
* @bin: The decodebin.
* @child: The child element doing the query
* @pad: The #GstPad.
* @element: The #GstElement.
* @query: The #GstQuery.
*
* This signal is emitted whenever an autoplugged element that is
* not linked downstream yet and not exposed does a query. It can
* be used to tell the element about the downstream supported caps
* for example.
*
* Returns: #TRUE if the query was handled, #FALSE otherwise.
*/
gst_decode_bin_signals[SIGNAL_AUTOPLUG_QUERY] =
g_signal_new ("autoplug-query", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_query),
_gst_boolean_or_accumulator, NULL, g_cclosure_marshal_generic,
G_TYPE_BOOLEAN, 3, GST_TYPE_PAD, GST_TYPE_ELEMENT,
GST_TYPE_QUERY | G_SIGNAL_TYPE_STATIC_SCOPE);
/**
* GstDecodeBin::drained
* @bin: The decodebin
*
* This signal is emitted once decodebin has finished decoding all the data.
*
* Since: 0.10.16
*/
gst_decode_bin_signals[SIGNAL_DRAINED] =
g_signal_new ("drained", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, drained),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 0, G_TYPE_NONE);
g_object_class_install_property (gobject_klass, PROP_CAPS,
g_param_spec_boxed ("caps", "Caps", "The caps on which to stop decoding.",
GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_klass, PROP_SUBTITLE_ENCODING,
g_param_spec_string ("subtitle-encoding", "subtitle encoding",
"Encoding to assume if input subtitles are not in UTF-8 encoding. "
"If not set, the GST_SUBTITLE_ENCODING environment variable will "
"be checked for an encoding to use. If that is not set either, "
"ISO-8859-15 will be assumed.", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_klass, PROP_SINK_CAPS,
g_param_spec_boxed ("sink-caps", "Sink Caps",
"The caps of the input data. (NULL = use typefind element)",
GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin::use-buffering
*
* Activate buffering in decodebin. This will instruct the multiqueues behind
* decoders to emit BUFFERING messages.
* Since: 0.10.26
*/
g_object_class_install_property (gobject_klass, PROP_USE_BUFFERING,
g_param_spec_boolean ("use-buffering", "Use Buffering",
"Emit GST_MESSAGE_BUFFERING based on low-/high-percent thresholds",
DEFAULT_USE_BUFFERING, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin:low-percent
*
* Low threshold percent for buffering to start.
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_klass, PROP_LOW_PERCENT,
g_param_spec_int ("low-percent", "Low percent",
"Low threshold for buffering to start", 0, 100,
DEFAULT_LOW_PERCENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin:high-percent
*
* High threshold percent for buffering to finish.
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_klass, PROP_HIGH_PERCENT,
g_param_spec_int ("high-percent", "High percent",
"High threshold for buffering to finish", 0, 100,
DEFAULT_HIGH_PERCENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin:max-size-bytes
*
* Max amount of bytes in the queue (0=automatic).
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_klass, PROP_MAX_SIZE_BYTES,
g_param_spec_uint ("max-size-bytes", "Max. size (bytes)",
"Max. amount of bytes in the queue (0=automatic)",
0, G_MAXUINT, DEFAULT_MAX_SIZE_BYTES,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin:max-size-buffers
*
* Max amount of buffers in the queue (0=automatic).
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_klass, PROP_MAX_SIZE_BUFFERS,
g_param_spec_uint ("max-size-buffers", "Max. size (buffers)",
"Max. number of buffers in the queue (0=automatic)",
0, G_MAXUINT, DEFAULT_MAX_SIZE_BUFFERS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin:max-size-time
*
* Max amount of time in the queue (in ns, 0=automatic).
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_klass, PROP_MAX_SIZE_TIME,
g_param_spec_uint64 ("max-size-time", "Max. size (ns)",
"Max. amount of data in the queue (in ns, 0=automatic)",
0, G_MAXUINT64,
DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin::post-stream-topology
*
* Post stream-topology messages on the bus every time the topology changes.
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_klass, PROP_POST_STREAM_TOPOLOGY,
g_param_spec_boolean ("post-stream-topology", "Post Stream Topology",
"Post stream-topology messages",
DEFAULT_POST_STREAM_TOPOLOGY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin::expose-all-streams
*
* Expose streams of unknown type.
*
* If set to %FALSE, then only the streams that can be decoded to the final
* caps (see 'caps' property) will have a pad exposed. Streams that do not
* match those caps but could have been decoded will not have decoder plugged
* in internally and will not have a pad exposed.
*
* Since: 0.10.30
*/
g_object_class_install_property (gobject_klass, PROP_EXPOSE_ALL_STREAMS,
g_param_spec_boolean ("expose-all-streams", "Expose All Streams",
"Expose all streams, including those of unknown type or that don't match the 'caps' property",
DEFAULT_EXPOSE_ALL_STREAMS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstDecodeBin2::connection-speed
*
* Network connection speed in kbps (0 = unknownw)
*
* Since: 0.10.XX
*/
g_object_class_install_property (gobject_klass, PROP_CONNECTION_SPEED,
g_param_spec_uint64 ("connection-speed", "Connection Speed",
"Network connection speed in kbps (0 = unknown)",
0, G_MAXUINT64 / 1000, DEFAULT_CONNECTION_SPEED,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
klass->autoplug_continue =
GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_continue);
klass->autoplug_factories =
GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_factories);
klass->autoplug_sort = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_sort);
klass->autoplug_select = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_select);
klass->autoplug_query = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_query);
gst_element_class_add_pad_template (gstelement_klass,
gst_static_pad_template_get (&decoder_bin_sink_template));
gst_element_class_add_pad_template (gstelement_klass,
gst_static_pad_template_get (&decoder_bin_src_template));
gst_element_class_set_static_metadata (gstelement_klass,
"Decoder Bin", "Generic/Bin/Decoder",
"Autoplug and decode to raw media",
"Edward Hervey <edward.hervey@collabora.co.uk>, "
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
gstelement_klass->change_state =
GST_DEBUG_FUNCPTR (gst_decode_bin_change_state);
gstbin_klass->handle_message =
GST_DEBUG_FUNCPTR (gst_decode_bin_handle_message);
g_type_class_ref (GST_TYPE_DECODE_PAD);
}
gint
_decode_bin_compare_factories_func (gconstpointer p1, gconstpointer p2)
{
GstPluginFeature *f1, *f2;
gboolean is_parser1, is_parser2;
f1 = (GstPluginFeature *) p1;
f2 = (GstPluginFeature *) p2;
is_parser1 = gst_element_factory_list_is_type (GST_ELEMENT_FACTORY_CAST (f1),
GST_ELEMENT_FACTORY_TYPE_PARSER);
is_parser2 = gst_element_factory_list_is_type (GST_ELEMENT_FACTORY_CAST (f2),
GST_ELEMENT_FACTORY_TYPE_PARSER);
/* We want all parsers first as we always want to plug parsers
* before decoders */
if (is_parser1 && !is_parser2)
return -1;
else if (!is_parser1 && is_parser2)
return 1;
/* And if it's a both a parser we first sort by rank
* and then by factory name */
return gst_plugin_feature_rank_compare_func (p1, p2);
}
/* Must be called with factories lock! */
static void
gst_decode_bin_update_factories_list (GstDecodeBin * dbin)
{
guint cookie;
cookie = gst_registry_get_feature_list_cookie (gst_registry_get ());
if (!dbin->factories || dbin->factories_cookie != cookie) {
if (dbin->factories)
gst_plugin_feature_list_free (dbin->factories);
dbin->factories =
gst_element_factory_list_get_elements
(GST_ELEMENT_FACTORY_TYPE_DECODABLE, GST_RANK_MARGINAL);
dbin->factories =
g_list_sort (dbin->factories, _decode_bin_compare_factories_func);
dbin->factories_cookie = cookie;
}
}
static void
gst_decode_bin_init (GstDecodeBin * decode_bin)
{
/* first filter out the interesting element factories */
g_mutex_init (&decode_bin->factories_lock);
/* we create the typefind element only once */
decode_bin->typefind = gst_element_factory_make ("typefind", "typefind");
if (!decode_bin->typefind) {
g_warning ("can't find typefind element, decodebin will not work");
} else {
GstPad *pad;
GstPad *gpad;
GstPadTemplate *pad_tmpl;
/* add the typefind element */
if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->typefind)) {
g_warning ("Could not add typefind element, decodebin will not work");
gst_object_unref (decode_bin->typefind);
decode_bin->typefind = NULL;
}
/* get the sinkpad */
pad = gst_element_get_static_pad (decode_bin->typefind, "sink");
/* get the pad template */
pad_tmpl = gst_static_pad_template_get (&decoder_bin_sink_template);
/* ghost the sink pad to ourself */
gpad = gst_ghost_pad_new_from_template ("sink", pad, pad_tmpl);
gst_pad_set_active (gpad, TRUE);
gst_element_add_pad (GST_ELEMENT (decode_bin), gpad);
gst_object_unref (pad_tmpl);
gst_object_unref (pad);
}
g_mutex_init (&decode_bin->expose_lock);
decode_bin->decode_chain = NULL;
g_mutex_init (&decode_bin->dyn_lock);
decode_bin->shutdown = FALSE;
decode_bin->blocked_pads = NULL;
g_mutex_init (&decode_bin->subtitle_lock);
decode_bin->encoding = g_strdup (DEFAULT_SUBTITLE_ENCODING);
decode_bin->caps = gst_static_caps_get (&default_raw_caps);
decode_bin->use_buffering = DEFAULT_USE_BUFFERING;
decode_bin->low_percent = DEFAULT_LOW_PERCENT;
decode_bin->high_percent = DEFAULT_HIGH_PERCENT;
decode_bin->max_size_bytes = DEFAULT_MAX_SIZE_BYTES;
decode_bin->max_size_buffers = DEFAULT_MAX_SIZE_BUFFERS;
decode_bin->max_size_time = DEFAULT_MAX_SIZE_TIME;
decode_bin->expose_allstreams = DEFAULT_EXPOSE_ALL_STREAMS;
decode_bin->connection_speed = DEFAULT_CONNECTION_SPEED;
}
static void
gst_decode_bin_dispose (GObject * object)
{
GstDecodeBin *decode_bin;
decode_bin = GST_DECODE_BIN (object);
if (decode_bin->factories)
gst_plugin_feature_list_free (decode_bin->factories);
decode_bin->factories = NULL;
if (decode_bin->decode_chain)
gst_decode_chain_free (decode_bin->decode_chain);
decode_bin->decode_chain = NULL;
if (decode_bin->caps)
gst_caps_unref (decode_bin->caps);
decode_bin->caps = NULL;
g_free (decode_bin->encoding);
decode_bin->encoding = NULL;
g_list_free (decode_bin->subtitles);
decode_bin->subtitles = NULL;
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_decode_bin_finalize (GObject * object)
{
GstDecodeBin *decode_bin;
decode_bin = GST_DECODE_BIN (object);
g_mutex_clear (&decode_bin->expose_lock);
g_mutex_clear (&decode_bin->dyn_lock);
g_mutex_clear (&decode_bin->subtitle_lock);
g_mutex_clear (&decode_bin->factories_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* _set_caps
* Changes the caps on which decodebin will stop decoding.
* Will unref the previously set one. The refcount of the given caps will be
* increased.
* @caps can be NULL.
*
* MT-safe
*/
static void
gst_decode_bin_set_caps (GstDecodeBin * dbin, GstCaps * caps)
{
GST_DEBUG_OBJECT (dbin, "Setting new caps: %" GST_PTR_FORMAT, caps);
GST_OBJECT_LOCK (dbin);
gst_caps_replace (&dbin->caps, caps);
GST_OBJECT_UNLOCK (dbin);
}
/* _get_caps
* Returns the currently configured caps on which decodebin will stop decoding.
* The returned caps (if not NULL), will have its refcount incremented.
*
* MT-safe
*/
static GstCaps *
gst_decode_bin_get_caps (GstDecodeBin * dbin)
{
GstCaps *caps;
GST_DEBUG_OBJECT (dbin, "Getting currently set caps");
GST_OBJECT_LOCK (dbin);
caps = dbin->caps;
if (caps)
gst_caps_ref (caps);
GST_OBJECT_UNLOCK (dbin);
return caps;
}
static void
gst_decode_bin_set_sink_caps (GstDecodeBin * dbin, GstCaps * caps)
{
GST_DEBUG_OBJECT (dbin, "Setting new caps: %" GST_PTR_FORMAT, caps);
g_object_set (dbin->typefind, "force-caps", caps, NULL);
}
static GstCaps *
gst_decode_bin_get_sink_caps (GstDecodeBin * dbin)
{
GstCaps *caps;
GST_DEBUG_OBJECT (dbin, "Getting currently set caps");
g_object_get (dbin->typefind, "force-caps", &caps, NULL);
return caps;
}
static void
gst_decode_bin_set_subs_encoding (GstDecodeBin * dbin, const gchar * encoding)
{
GList *walk;
GST_DEBUG_OBJECT (dbin, "Setting new encoding: %s", GST_STR_NULL (encoding));
SUBTITLE_LOCK (dbin);
g_free (dbin->encoding);
dbin->encoding = g_strdup (encoding);
/* set the subtitle encoding on all added elements */
for (walk = dbin->subtitles; walk; walk = g_list_next (walk)) {
g_object_set (G_OBJECT (walk->data), "subtitle-encoding", dbin->encoding,
NULL);
}
SUBTITLE_UNLOCK (dbin);
}
static gchar *
gst_decode_bin_get_subs_encoding (GstDecodeBin * dbin)
{
gchar *encoding;
GST_DEBUG_OBJECT (dbin, "Getting currently set encoding");
SUBTITLE_LOCK (dbin);
encoding = g_strdup (dbin->encoding);
SUBTITLE_UNLOCK (dbin);
return encoding;
}
static void
gst_decode_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstDecodeBin *dbin;
dbin = GST_DECODE_BIN (object);
switch (prop_id) {
case PROP_CAPS:
gst_decode_bin_set_caps (dbin, g_value_get_boxed (value));
break;
case PROP_SUBTITLE_ENCODING:
gst_decode_bin_set_subs_encoding (dbin, g_value_get_string (value));
break;
case PROP_SINK_CAPS:
gst_decode_bin_set_sink_caps (dbin, g_value_get_boxed (value));
break;
case PROP_USE_BUFFERING:
dbin->use_buffering = g_value_get_boolean (value);
break;
case PROP_LOW_PERCENT:
dbin->low_percent = g_value_get_int (value);
break;
case PROP_HIGH_PERCENT:
dbin->high_percent = g_value_get_int (value);
break;
case PROP_MAX_SIZE_BYTES:
dbin->max_size_bytes = g_value_get_uint (value);
break;
case PROP_MAX_SIZE_BUFFERS:
dbin->max_size_buffers = g_value_get_uint (value);
break;
case PROP_MAX_SIZE_TIME:
dbin->max_size_time = g_value_get_uint64 (value);
break;
case PROP_POST_STREAM_TOPOLOGY:
dbin->post_stream_topology = g_value_get_boolean (value);
break;
case PROP_EXPOSE_ALL_STREAMS:
dbin->expose_allstreams = g_value_get_boolean (value);
break;
case PROP_CONNECTION_SPEED:
GST_OBJECT_LOCK (dbin);
dbin->connection_speed = g_value_get_uint64 (value) * 1000;
GST_OBJECT_UNLOCK (dbin);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_decode_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstDecodeBin *dbin;
dbin = GST_DECODE_BIN (object);
switch (prop_id) {
case PROP_CAPS:
g_value_take_boxed (value, gst_decode_bin_get_caps (dbin));
break;
case PROP_SUBTITLE_ENCODING:
g_value_take_string (value, gst_decode_bin_get_subs_encoding (dbin));
break;
case PROP_SINK_CAPS:
g_value_take_boxed (value, gst_decode_bin_get_sink_caps (dbin));
break;
case PROP_USE_BUFFERING:
g_value_set_boolean (value, dbin->use_buffering);
break;
case PROP_LOW_PERCENT:
g_value_set_int (value, dbin->low_percent);
break;
case PROP_HIGH_PERCENT:
g_value_set_int (value, dbin->high_percent);
break;
case PROP_MAX_SIZE_BYTES:
g_value_set_uint (value, dbin->max_size_bytes);
break;
case PROP_MAX_SIZE_BUFFERS:
g_value_set_uint (value, dbin->max_size_buffers);
break;
case PROP_MAX_SIZE_TIME:
g_value_set_uint64 (value, dbin->max_size_time);
break;
case PROP_POST_STREAM_TOPOLOGY:
g_value_set_boolean (value, dbin->post_stream_topology);
break;
case PROP_EXPOSE_ALL_STREAMS:
g_value_set_boolean (value, dbin->expose_allstreams);
break;
case PROP_CONNECTION_SPEED:
GST_OBJECT_LOCK (dbin);
g_value_set_uint64 (value, dbin->connection_speed / 1000);
GST_OBJECT_UNLOCK (dbin);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/*****
* Default autoplug signal handlers
*****/
static gboolean
gst_decode_bin_autoplug_continue (GstElement * element, GstPad * pad,
GstCaps * caps)
{
GST_DEBUG_OBJECT (element, "autoplug-continue returns TRUE");
/* by default we always continue */
return TRUE;
}
static GValueArray *
gst_decode_bin_autoplug_factories (GstElement * element, GstPad * pad,
GstCaps * caps)
{
GList *list, *tmp;
GValueArray *result;
GstDecodeBin *dbin = GST_DECODE_BIN_CAST (element);
GST_DEBUG_OBJECT (element, "finding factories");
/* return all compatible factories for caps */
g_mutex_lock (&dbin->factories_lock);
gst_decode_bin_update_factories_list (dbin);
list =
gst_element_factory_list_filter (dbin->factories, caps, GST_PAD_SINK,
gst_caps_is_fixed (caps));
g_mutex_unlock (&dbin->factories_lock);
result = g_value_array_new (g_list_length (list));
for (tmp = list; tmp; tmp = tmp->next) {
GstElementFactory *factory = GST_ELEMENT_FACTORY_CAST (tmp->data);
GValue val = { 0, };
g_value_init (&val, G_TYPE_OBJECT);
g_value_set_object (&val, factory);
g_value_array_append (result, &val);
g_value_unset (&val);
}
gst_plugin_feature_list_free (list);
GST_DEBUG_OBJECT (element, "autoplug-factories returns %p", result);
return result;
}
static GValueArray *
gst_decode_bin_autoplug_sort (GstElement * element, GstPad * pad,
GstCaps * caps, GValueArray * factories)
{
return NULL;
}
static GstAutoplugSelectResult
gst_decode_bin_autoplug_select (GstElement * element, GstPad * pad,
GstCaps * caps, GstElementFactory * factory)
{
GST_DEBUG_OBJECT (element, "default autoplug-select returns TRY");
/* Try factory. */
return GST_AUTOPLUG_SELECT_TRY;
}
static gboolean
gst_decode_bin_autoplug_query (GstElement * element, GstPad * pad,
GstQuery * query)
{
/* No query handled here */
return FALSE;
}
/********
* Discovery methods
*****/
static gboolean are_final_caps (GstDecodeBin * dbin, GstCaps * caps);
static gboolean is_demuxer_element (GstElement * srcelement);
static gboolean connect_pad (GstDecodeBin * dbin, GstElement * src,
GstDecodePad * dpad, GstPad * pad, GstCaps * caps, GValueArray * factories,
GstDecodeChain * chain);
static gboolean connect_element (GstDecodeBin * dbin, GstDecodeElement * delem,
GstDecodeChain * chain);
static void expose_pad (GstDecodeBin * dbin, GstElement * src,
GstDecodePad * dpad, GstPad * pad, GstCaps * caps, GstDecodeChain * chain);
static void pad_added_cb (GstElement * element, GstPad * pad,
GstDecodeChain * chain);
static void pad_removed_cb (GstElement * element, GstPad * pad,
GstDecodeChain * chain);
static void no_more_pads_cb (GstElement * element, GstDecodeChain * chain);
static GstDecodeGroup *gst_decode_chain_get_current_group (GstDecodeChain *
chain);
/* called when a new pad is discovered. It will perform some basic actions
* before trying to link something to it.
*
* - Check the caps, don't do anything when there are no caps or when they have
* no good type.
* - signal AUTOPLUG_CONTINUE to check if we need to continue autoplugging this
* pad.
* - if the caps are non-fixed, setup a handler to continue autoplugging when
* the caps become fixed (connect to notify::caps).
* - get list of factories to autoplug.
* - continue autoplugging to one of the factories.
*/
static void
analyze_new_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad,
GstCaps * caps, GstDecodeChain * chain)
{
gboolean apcontinue = TRUE;
GValueArray *factories = NULL, *result = NULL;
GstDecodePad *dpad;
GstElementFactory *factory;
const gchar *classification;
gboolean is_parser_converter = FALSE;
gboolean res;
GST_DEBUG_OBJECT (dbin, "Pad %s:%s caps:%" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), caps);
if (chain->elements
&& src != ((GstDecodeElement *) chain->elements->data)->element
&& src != ((GstDecodeElement *) chain->elements->data)->capsfilter) {
GST_ERROR_OBJECT (dbin, "New pad from not the last element in this chain");
return;
}
if (chain->endpad) {
GST_ERROR_OBJECT (dbin, "New pad in a chain that is already complete");
return;
}
if (chain->demuxer) {
GstDecodeGroup *group;
GstDecodeChain *oldchain = chain;
if (chain->current_pad)
gst_object_unref (chain->current_pad);
chain->current_pad = NULL;
/* we are adding a new pad for a demuxer (see is_demuxer_element(),
* start a new chain for it */
CHAIN_MUTEX_LOCK (oldchain);
group = gst_decode_chain_get_current_group (chain);
if (group && !g_list_find (group->children, chain)) {
chain = gst_decode_chain_new (dbin, group, pad);
group->children = g_list_prepend (group->children, chain);
}
CHAIN_MUTEX_UNLOCK (oldchain);
if (!group) {
GST_WARNING_OBJECT (dbin, "No current group");
return;
}
}
if ((caps == NULL) || gst_caps_is_empty (caps))
goto unknown_type;
if (gst_caps_is_any (caps))
goto any_caps;
if (!chain->current_pad)
chain->current_pad = gst_decode_pad_new (dbin, chain);
dpad = gst_object_ref (chain->current_pad);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), pad);
/* 1. Emit 'autoplug-continue' the result will tell us if this pads needs
* further autoplugging. Only do this for fixed caps, for unfixed caps
* we will later come here again from the notify::caps handler. The
* problem with unfixed caps is that we can reliably tell if the output
* is e.g. accepted by a sink because only parts of the possible final
* caps might be accepted by the sink. */
if (gst_caps_is_fixed (caps))
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE], 0, dpad, caps,
&apcontinue);
else
apcontinue = TRUE;
/* 1.a if autoplug-continue is FALSE or caps is a raw format, goto pad_is_final */
if ((!apcontinue) || are_final_caps (dbin, caps))
goto expose_pad;
/* 1.b For Parser/Converter that can output different stream formats
* we insert a capsfilter with the sorted caps of all possible next
* elements and continue with the capsfilter srcpad */
factory = gst_element_get_factory (src);
classification =
gst_element_factory_get_metadata (factory, GST_ELEMENT_METADATA_KLASS);
is_parser_converter = (strstr (classification, "Parser")
&& strstr (classification, "Converter"));
/* 1.c when the caps are not fixed yet, we can't be sure what element to
* connect. We delay autoplugging until the caps are fixed */
if (!is_parser_converter && !gst_caps_is_fixed (caps))
goto non_fixed;
/* 1.d else get the factories and if there's no compatible factory goto
* unknown_type */
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_AUTOPLUG_FACTORIES], 0, dpad, caps,
&factories);
/* NULL means that we can expose the pad */
if (factories == NULL)
goto expose_pad;
/* if the array is empty, we have a type for which we have no decoder */
if (factories->n_values == 0) {
if (!dbin->expose_allstreams) {
GstCaps *raw = gst_static_caps_get (&default_raw_caps);
/* If the caps are raw, this just means we don't want to expose them */
if (gst_caps_is_subset (caps, raw)) {
g_value_array_free (factories);
gst_caps_unref (raw);
gst_object_unref (dpad);
goto discarded_type;
}
gst_caps_unref (raw);
}
/* if not we have a unhandled type with no compatible factories */
g_value_array_free (factories);
gst_object_unref (dpad);
goto unknown_type;
}
/* 1.e sort some more. */
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT], 0, dpad, caps, factories,
&result);
if (result) {
g_value_array_free (factories);
factories = result;
}
/* At this point we have a potential decoder, but we might not need it
* if it doesn't match the output caps */
if (!dbin->expose_allstreams && gst_caps_is_fixed (caps)) {
guint i;
const GList *tmps;
gboolean dontuse = FALSE;
GST_DEBUG ("Checking if we can abort early");
/* 1.f Do an early check to see if the candidates are potential decoders, but
* due to the fact that they decode to a mediatype that is not final we don't
* need them */
for (i = 0; i < factories->n_values && !dontuse; i++) {
GstElementFactory *factory =
g_value_get_object (g_value_array_get_nth (factories, i));
GstCaps *tcaps;
/* We are only interested in skipping decoders */
if (strstr (gst_element_factory_get_metadata (factory,
GST_ELEMENT_METADATA_KLASS), "Decoder")) {
GST_DEBUG ("Trying factory %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
/* Check the source pad template caps to see if they match raw caps but don't match
* our final caps*/
for (tmps = gst_element_factory_get_static_pad_templates (factory);
tmps && !dontuse; tmps = tmps->next) {
GstStaticPadTemplate *st = (GstStaticPadTemplate *) tmps->data;
if (st->direction != GST_PAD_SRC)
continue;
tcaps = gst_static_pad_template_get_caps (st);
apcontinue = TRUE;
/* Emit autoplug-continue to see if the caps are considered to be raw caps */
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE], 0, dpad, tcaps,
&apcontinue);
/* If autoplug-continue returns TRUE and the caps are not final, don't use them */
if (apcontinue && !are_final_caps (dbin, tcaps))
dontuse = TRUE;
gst_caps_unref (tcaps);
}
}
}
if (dontuse) {
gst_object_unref (dpad);
g_value_array_free (factories);
goto discarded_type;
}
}
/* 1.g now get the factory template caps and insert the capsfilter if this
* is a parser/converter
*/
if (is_parser_converter) {
GstCaps *filter_caps;
gint i;
GstPad *p;
GstDecodeElement *delem;
g_assert (chain->elements != NULL);
delem = (GstDecodeElement *) chain->elements->data;
filter_caps = gst_caps_new_empty ();
for (i = 0; i < factories->n_values; i++) {
GstElementFactory *factory =
g_value_get_object (g_value_array_get_nth (factories, i));
GstCaps *tcaps, *intersection;
const GList *tmps;
GST_DEBUG ("Trying factory %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
if (gst_element_get_factory (src) == factory) {
GST_DEBUG ("Skipping factory");
continue;
}
for (tmps = gst_element_factory_get_static_pad_templates (factory); tmps;
tmps = tmps->next) {
GstStaticPadTemplate *st = (GstStaticPadTemplate *) tmps->data;
if (st->direction != GST_PAD_SINK || st->presence != GST_PAD_ALWAYS)
continue;
tcaps = gst_static_pad_template_get_caps (st);
intersection =
gst_caps_intersect_full (tcaps, caps, GST_CAPS_INTERSECT_FIRST);
filter_caps = gst_caps_merge (filter_caps, intersection);
gst_caps_unref (tcaps);
}
}
/* Append the parser caps to prevent any not-negotiated errors */
filter_caps = gst_caps_merge (filter_caps, gst_caps_ref (caps));
delem->capsfilter = gst_element_factory_make ("capsfilter", NULL);
g_object_set (G_OBJECT (delem->capsfilter), "caps", filter_caps, NULL);
gst_caps_unref (filter_caps);
gst_element_set_state (delem->capsfilter, GST_STATE_PAUSED);
gst_bin_add (GST_BIN_CAST (dbin), gst_object_ref (delem->capsfilter));
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), NULL);
p = gst_element_get_static_pad (delem->capsfilter, "sink");
gst_pad_link_full (pad, p, GST_PAD_LINK_CHECK_NOTHING);
gst_object_unref (p);
p = gst_element_get_static_pad (delem->capsfilter, "src");
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), p);
pad = p;
if (!gst_caps_is_fixed (caps)) {
g_value_array_free (factories);
goto non_fixed;
}
}
/* 1.h else continue autoplugging something from the list. */
GST_LOG_OBJECT (pad, "Let's continue discovery on this pad");
res = connect_pad (dbin, src, dpad, pad, caps, factories, chain);
/* Need to unref the capsfilter srcpad here if
* we inserted a capsfilter */
if (is_parser_converter)
gst_object_unref (pad);
gst_object_unref (dpad);
g_value_array_free (factories);
if (!res)
goto unknown_type;
return;
expose_pad:
{
GST_LOG_OBJECT (dbin, "Pad is final. autoplug-continue:%d", apcontinue);
expose_pad (dbin, src, dpad, pad, caps, chain);
gst_object_unref (dpad);
return;
}
discarded_type:
{
GST_LOG_OBJECT (pad, "Known type, but discarded because not final caps");
chain->deadend = TRUE;
chain->endcaps = gst_caps_ref (caps);
gst_object_replace ((GstObject **) & chain->current_pad, NULL);
/* Try to expose anything */
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain)) {
gst_decode_bin_expose (dbin);
}
EXPOSE_UNLOCK (dbin);
do_async_done (dbin);
return;
}
unknown_type:
{
GST_LOG_OBJECT (pad, "Unknown type, posting message and firing signal");
chain->deadend = TRUE;
chain->endcaps = gst_caps_ref (caps);
gst_object_replace ((GstObject **) & chain->current_pad, NULL);
gst_element_post_message (GST_ELEMENT_CAST (dbin),
gst_missing_decoder_message_new (GST_ELEMENT_CAST (dbin), caps));
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE], 0, pad, caps);
/* Try to expose anything */
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain)) {
gst_decode_bin_expose (dbin);
}
EXPOSE_UNLOCK (dbin);
if (src == dbin->typefind) {
gchar *desc;
if (caps && !gst_caps_is_empty (caps)) {
desc = gst_pb_utils_get_decoder_description (caps);
GST_ELEMENT_ERROR (dbin, STREAM, CODEC_NOT_FOUND,
(_("A %s plugin is required to play this stream, "
"but not installed."), desc),
("No decoder to handle media type '%s'",
gst_structure_get_name (gst_caps_get_structure (caps, 0))));
g_free (desc);
} else {
GST_ELEMENT_ERROR (dbin, STREAM, TYPE_NOT_FOUND,
(_("Could not determine type of stream")),
("Stream caps %" GST_PTR_FORMAT, caps));
}
do_async_done (dbin);
}
return;
}
non_fixed:
{
GST_DEBUG_OBJECT (pad, "pad has non-fixed caps delay autoplugging");
gst_object_unref (dpad);
goto setup_caps_delay;
}
any_caps:
{
GST_DEBUG_OBJECT (pad, "pad has ANY caps, delaying auto-pluggin");
goto setup_caps_delay;
}
setup_caps_delay:
{
GstPendingPad *ppad;
/* connect to caps notification */
CHAIN_MUTEX_LOCK (chain);
GST_LOG_OBJECT (dbin, "Chain %p has now %d dynamic pads", chain,
g_list_length (chain->pending_pads));
ppad = g_slice_new0 (GstPendingPad);
ppad->pad = gst_object_ref (pad);
ppad->chain = chain;
ppad->event_probe_id =
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
pad_event_cb, ppad, NULL);
chain->pending_pads = g_list_prepend (chain->pending_pads, ppad);
ppad->notify_caps_id = g_signal_connect (pad, "notify::caps",
G_CALLBACK (caps_notify_cb), chain);
CHAIN_MUTEX_UNLOCK (chain);
/* If we're here because we have a Parser/Converter
* we have to unref the pad */
if (is_parser_converter)
gst_object_unref (pad);
return;
}
}
static void
add_error_filter (GstDecodeBin * dbin, GstElement * element)
{
GST_OBJECT_LOCK (dbin);
dbin->filtered = g_list_prepend (dbin->filtered, element);
GST_OBJECT_UNLOCK (dbin);
}
static void
remove_error_filter (GstDecodeBin * dbin, GstElement * element)
{
GST_OBJECT_LOCK (dbin);
dbin->filtered = g_list_remove (dbin->filtered, element);
GST_OBJECT_UNLOCK (dbin);
}
/* connect_pad:
*
* Try to connect the given pad to an element created from one of the factories,
* and recursively.
*
* Note that dpad is ghosting pad, and so pad is linked; be sure to unset dpad's
* target before trying to link pad.
*
* Returns TRUE if an element was properly created and linked
*/
static gboolean
connect_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad,
GstPad * pad, GstCaps * caps, GValueArray * factories,
GstDecodeChain * chain)
{
gboolean res = FALSE;
GstPad *mqpad = NULL;
gboolean is_demuxer = chain->parent && !chain->elements; /* First pad after the demuxer */
g_return_val_if_fail (factories != NULL, FALSE);
g_return_val_if_fail (factories->n_values > 0, FALSE);
GST_DEBUG_OBJECT (dbin,
"pad %s:%s , chain:%p, %d factories, caps %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), chain, factories->n_values, caps);
/* 1. is element demuxer or parser */
if (is_demuxer) {
GST_LOG_OBJECT (src,
"is a demuxer, connecting the pad through multiqueue '%s'",
GST_OBJECT_NAME (chain->parent->multiqueue));
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), NULL);
if (!(mqpad = gst_decode_group_control_demuxer_pad (chain->parent, pad)))
goto beach;
src = chain->parent->multiqueue;
pad = mqpad;
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), pad);
}
/* 2. Try to create an element and link to it */
while (factories->n_values > 0) {
GstAutoplugSelectResult ret;
GstElementFactory *factory;
GstDecodeElement *delem;
GstElement *element;
GstPad *sinkpad;
GParamSpec *pspec;
gboolean subtitle;
/* Set dpad target to pad again, it might've been unset
* below but we came back here because something failed
*/
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), pad);
/* take first factory */
factory = g_value_get_object (g_value_array_get_nth (factories, 0));
/* Remove selected factory from the list. */
g_value_array_remove (factories, 0);
GST_LOG_OBJECT (src, "trying factory %" GST_PTR_FORMAT, factory);
/* Check if the caps are really supported by the factory. The
* factory list is non-empty-subset filtered while caps
* are only accepted by a pad if they are a subset of the
* pad caps.
*
* FIXME: Only do this for fixed caps here. Non-fixed caps
* can happen if a Parser/Converter was autoplugged before
* this. We then assume that it will be able to convert to
* everything that the decoder would want.
*
* A subset check will fail here because the parser caps
* will be generic and while the decoder will only
* support a subset of the parser caps.
*/
if (gst_caps_is_fixed (caps)) {
const GList *templs;
gboolean skip = FALSE;
templs = gst_element_factory_get_static_pad_templates (factory);
while (templs) {
GstStaticPadTemplate *templ = (GstStaticPadTemplate *) templs->data;
if (templ->direction == GST_PAD_SINK) {
GstCaps *templcaps = gst_static_caps_get (&templ->static_caps);
if (!gst_caps_is_subset (caps, templcaps)) {
GST_DEBUG_OBJECT (src,
"caps %" GST_PTR_FORMAT " not subset of %" GST_PTR_FORMAT, caps,
templcaps);
gst_caps_unref (templcaps);
skip = TRUE;
break;
}
gst_caps_unref (templcaps);
}
templs = g_list_next (templs);
}
if (skip)
continue;
}
/* If the factory is for a parser we first check if the factory
* was already used for the current chain. If it was used already
* we would otherwise create an infinite loop here because the
* parser apparently accepts its own output as input.
* This is only done for parsers because it's perfectly valid
* to have other element classes after each other because a
* parser is the only one that does not change the data. A
* valid example for this would be multiple id3demux in a row.
*/
if (strstr (gst_element_factory_get_metadata (factory,
GST_ELEMENT_METADATA_KLASS), "Parser")) {
gboolean skip = FALSE;
GList *l;
CHAIN_MUTEX_LOCK (chain);
for (l = chain->elements; l; l = l->next) {
GstDecodeElement *delem = (GstDecodeElement *) l->data;
GstElement *otherelement = delem->element;
if (gst_element_get_factory (otherelement) == factory) {
skip = TRUE;
break;
}
}
CHAIN_MUTEX_UNLOCK (chain);
if (skip) {
GST_DEBUG_OBJECT (dbin,
"Skipping factory '%s' because it was already used in this chain",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (factory)));
continue;
}
}
/* emit autoplug-select to see what we should do with it. */
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_AUTOPLUG_SELECT],
0, dpad, caps, factory, &ret);
switch (ret) {
case GST_AUTOPLUG_SELECT_TRY:
GST_DEBUG_OBJECT (dbin, "autoplug select requested try");
break;
case GST_AUTOPLUG_SELECT_EXPOSE:
GST_DEBUG_OBJECT (dbin, "autoplug select requested expose");
/* expose the pad, we don't have the source element */
expose_pad (dbin, src, dpad, pad, caps, chain);
res = TRUE;
goto beach;
case GST_AUTOPLUG_SELECT_SKIP:
GST_DEBUG_OBJECT (dbin, "autoplug select requested skip");
continue;
default:
GST_WARNING_OBJECT (dbin, "autoplug select returned unhandled %d", ret);
break;
}
/* 2.0. Unlink pad */
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), NULL);
/* 2.1. Try to create an element */
if ((element = gst_element_factory_create (factory, NULL)) == NULL) {
GST_WARNING_OBJECT (dbin, "Could not create an element from %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
continue;
}
/* Filter errors, this will prevent the element from causing the pipeline
* to error while we test it using READY state. */
add_error_filter (dbin, element);
/* We don't yet want the bin to control the element's state */
gst_element_set_locked_state (element, TRUE);
/* ... add it ... */
if (!(gst_bin_add (GST_BIN_CAST (dbin), element))) {
GST_WARNING_OBJECT (dbin, "Couldn't add %s to the bin",
GST_ELEMENT_NAME (element));
remove_error_filter (dbin, element);
gst_object_unref (element);
continue;
}
/* Find its sink pad. */
if (!(sinkpad = find_sink_pad (element))) {
GST_WARNING_OBJECT (dbin, "Element %s doesn't have a sink pad",
GST_ELEMENT_NAME (element));
remove_error_filter (dbin, element);
gst_bin_remove (GST_BIN (dbin), element);
continue;
}
/* ... and try to link */
if ((gst_pad_link (pad, sinkpad)) != GST_PAD_LINK_OK) {
GST_WARNING_OBJECT (dbin, "Link failed on pad %s:%s",
GST_DEBUG_PAD_NAME (sinkpad));
remove_error_filter (dbin, element);
gst_object_unref (sinkpad);
gst_bin_remove (GST_BIN (dbin), element);
continue;
}
/* ... activate it ... */
if ((gst_element_set_state (element,
GST_STATE_READY)) == GST_STATE_CHANGE_FAILURE) {
GST_WARNING_OBJECT (dbin, "Couldn't set %s to READY",
GST_ELEMENT_NAME (element));
remove_error_filter (dbin, element);
gst_object_unref (sinkpad);
gst_bin_remove (GST_BIN (dbin), element);
continue;
}
/* Stop filtering errors. */
remove_error_filter (dbin, element);
/* check if we still accept the caps on the pad after setting
* the element to READY */
if (!gst_pad_query_accept_caps (sinkpad, caps)) {
GST_WARNING_OBJECT (dbin, "Element %s does not accept caps",
GST_ELEMENT_NAME (element));
gst_element_set_state (element, GST_STATE_NULL);
gst_object_unref (sinkpad);
gst_bin_remove (GST_BIN (dbin), element);
continue;
}
gst_object_unref (sinkpad);
GST_LOG_OBJECT (dbin, "linked on pad %s:%s", GST_DEBUG_PAD_NAME (pad));
CHAIN_MUTEX_LOCK (chain);
delem = g_slice_new0 (GstDecodeElement);
delem->element = gst_object_ref (element);
delem->capsfilter = NULL;
chain->elements = g_list_prepend (chain->elements, delem);
chain->demuxer = is_demuxer_element (element);
CHAIN_MUTEX_UNLOCK (chain);
/* Set connection-speed property if needed */
if (chain->demuxer == TRUE) {
GParamSpec *pspec;
if ((pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (element),
"connection-speed"))) {
guint64 speed = dbin->connection_speed / 1000;
gboolean wrong_type = FALSE;
if (G_PARAM_SPEC_TYPE (pspec) == G_TYPE_PARAM_UINT) {
GParamSpecUInt *pspecuint = G_PARAM_SPEC_UINT (pspec);
speed = CLAMP (speed, pspecuint->minimum, pspecuint->maximum);
} else if (G_PARAM_SPEC_TYPE (pspec) == G_TYPE_PARAM_INT) {
GParamSpecInt *pspecint = G_PARAM_SPEC_INT (pspec);
speed = CLAMP (speed, pspecint->minimum, pspecint->maximum);
} else if (G_PARAM_SPEC_TYPE (pspec) == G_TYPE_PARAM_UINT64) {
GParamSpecUInt64 *pspecuint = G_PARAM_SPEC_UINT64 (pspec);
speed = CLAMP (speed, pspecuint->minimum, pspecuint->maximum);
} else if (G_PARAM_SPEC_TYPE (pspec) == G_TYPE_PARAM_INT64) {
GParamSpecInt64 *pspecint = G_PARAM_SPEC_INT64 (pspec);
speed = CLAMP (speed, pspecint->minimum, pspecint->maximum);
} else {
GST_WARNING_OBJECT (dbin,
"The connection speed property %" G_GUINT64_FORMAT " of type %s"
" is not usefull not setting it", speed,
g_type_name (G_PARAM_SPEC_TYPE (pspec)));
wrong_type = TRUE;
}
if (wrong_type == FALSE) {
GST_DEBUG_OBJECT (dbin, "setting connection-speed=%" G_GUINT64_FORMAT
" to demuxer element", speed);
g_object_set (element, "connection-speed", speed, NULL);
}
}
}
/* link this element further */
connect_element (dbin, delem, chain);
/* try to configure the subtitle encoding property when we can */
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (element),
"subtitle-encoding");
if (pspec && G_PARAM_SPEC_VALUE_TYPE (pspec) == G_TYPE_STRING) {
SUBTITLE_LOCK (dbin);
GST_DEBUG_OBJECT (dbin,
"setting subtitle-encoding=%s to element", dbin->encoding);
g_object_set (G_OBJECT (element), "subtitle-encoding", dbin->encoding,
NULL);
SUBTITLE_UNLOCK (dbin);
subtitle = TRUE;
} else {
subtitle = FALSE;
}
/* Bring the element to the state of the parent */
if ((gst_element_set_state (element,
GST_STATE_PAUSED)) == GST_STATE_CHANGE_FAILURE) {
GstDecodeElement *dtmp = NULL;
GstElement *tmp = NULL;
GST_WARNING_OBJECT (dbin, "Couldn't set %s to PAUSED",
GST_ELEMENT_NAME (element));
/* Remove all elements in this chain that were just added. No
* other thread could've added elements in the meantime */
CHAIN_MUTEX_LOCK (chain);
do {
GList *l;
dtmp = chain->elements->data;
tmp = dtmp->element;
/* Disconnect any signal handlers that might be connected
* in connect_element() or analyze_pad() */
if (dtmp->pad_added_id)
g_signal_handler_disconnect (tmp, dtmp->pad_added_id);
if (dtmp->pad_removed_id)
g_signal_handler_disconnect (tmp, dtmp->pad_removed_id);
if (dtmp->no_more_pads_id)
g_signal_handler_disconnect (tmp, dtmp->no_more_pads_id);
for (l = chain->pending_pads; l;) {
GstPendingPad *pp = l->data;
GList *n;
if (GST_PAD_PARENT (pp->pad) != tmp) {
l = l->next;
continue;
}
gst_pending_pad_free (pp);
/* Remove element from the list, update list head and go to the
* next element in the list */
n = l->next;
chain->pending_pads = g_list_delete_link (chain->pending_pads, l);
l = n;
}
if (dtmp->capsfilter) {
gst_bin_remove (GST_BIN (dbin), dtmp->capsfilter);
gst_element_set_state (dtmp->capsfilter, GST_STATE_NULL);
gst_object_unref (dtmp->capsfilter);
}
gst_bin_remove (GST_BIN (dbin), tmp);
gst_element_set_state (tmp, GST_STATE_NULL);
gst_object_unref (tmp);
g_slice_free (GstDecodeElement, dtmp);
chain->elements = g_list_delete_link (chain->elements, chain->elements);
} while (tmp != element);
CHAIN_MUTEX_UNLOCK (chain);
continue;
}
/* Now let the bin handle the state */
gst_element_set_locked_state (element, FALSE);
if (subtitle) {
SUBTITLE_LOCK (dbin);
/* we added the element now, add it to the list of subtitle-encoding
* elements when we can set the property */
dbin->subtitles = g_list_prepend (dbin->subtitles, element);
SUBTITLE_UNLOCK (dbin);
}
res = TRUE;
break;
}
beach:
if (mqpad)
gst_object_unref (mqpad);
return res;
}
static GstCaps *
get_pad_caps (GstPad * pad)
{
GstCaps *caps;
/* first check the pad caps, if this is set, we are positively sure it is
* fixed and exactly what the element will produce. */
caps = gst_pad_get_current_caps (pad);
/* then use the getcaps function if we don't have caps. These caps might not
* be fixed in some cases, in which case analyze_new_pad will set up a
* notify::caps signal to continue autoplugging. */
if (caps == NULL)
caps = gst_pad_query_caps (pad, NULL);
return caps;
}
static gboolean
connect_element (GstDecodeBin * dbin, GstDecodeElement * delem,
GstDecodeChain * chain)
{
GstElement *element = delem->element;
GList *pads;
gboolean res = TRUE;
gboolean dynamic = FALSE;
GList *to_connect = NULL;
GST_DEBUG_OBJECT (dbin, "Attempting to connect element %s [chain:%p] further",
GST_ELEMENT_NAME (element), chain);
/* 1. Loop over pad templates, grabbing existing pads along the way */
for (pads = GST_ELEMENT_GET_CLASS (element)->padtemplates; pads;
pads = g_list_next (pads)) {
GstPadTemplate *templ = GST_PAD_TEMPLATE (pads->data);
const gchar *templ_name;
/* we are only interested in source pads */
if (GST_PAD_TEMPLATE_DIRECTION (templ) != GST_PAD_SRC)
continue;
templ_name = GST_PAD_TEMPLATE_NAME_TEMPLATE (templ);
GST_DEBUG_OBJECT (dbin, "got a source pad template %s", templ_name);
/* figure out what kind of pad this is */
switch (GST_PAD_TEMPLATE_PRESENCE (templ)) {
case GST_PAD_ALWAYS:
{
/* get the pad that we need to autoplug */
GstPad *pad = gst_element_get_static_pad (element, templ_name);
if (pad) {
GST_DEBUG_OBJECT (dbin, "got the pad for always template %s",
templ_name);
/* here is the pad, we need to autoplug it */
to_connect = g_list_prepend (to_connect, pad);
} else {
/* strange, pad is marked as always but it's not
* there. Fix the element */
GST_WARNING_OBJECT (dbin,
"could not get the pad for always template %s", templ_name);
}
break;
}
case GST_PAD_SOMETIMES:
{
/* try to get the pad to see if it is already created or
* not */
GstPad *pad = gst_element_get_static_pad (element, templ_name);
if (pad) {
GST_DEBUG_OBJECT (dbin, "got the pad for sometimes template %s",
templ_name);
/* the pad is created, we need to autoplug it */
to_connect = g_list_prepend (to_connect, pad);
} else {
GST_DEBUG_OBJECT (dbin,
"did not get the sometimes pad of template %s", templ_name);
/* we have an element that will create dynamic pads */
dynamic = TRUE;
}
break;
}
case GST_PAD_REQUEST:
/* ignore request pads */
GST_DEBUG_OBJECT (dbin, "ignoring request padtemplate %s", templ_name);
break;
}
}
/* 2. if there are more potential pads, connect to relevant signals */
if (dynamic) {
GST_LOG_OBJECT (dbin, "Adding signals to element %s in chain %p",
GST_ELEMENT_NAME (element), chain);
delem->pad_added_id = g_signal_connect (element, "pad-added",
G_CALLBACK (pad_added_cb), chain);
delem->pad_removed_id = g_signal_connect (element, "pad-removed",
G_CALLBACK (pad_removed_cb), chain);
delem->no_more_pads_id = g_signal_connect (element, "no-more-pads",
G_CALLBACK (no_more_pads_cb), chain);
}
/* 3. for every available pad, connect it */
for (pads = to_connect; pads; pads = g_list_next (pads)) {
GstPad *pad = GST_PAD_CAST (pads->data);
GstCaps *caps;
caps = get_pad_caps (pad);
analyze_new_pad (dbin, element, pad, caps, chain);
if (caps)
gst_caps_unref (caps);
gst_object_unref (pad);
}
g_list_free (to_connect);
return res;
}
/* expose_pad:
*
* Expose the given pad on the chain as a decoded pad.
*/
static void
expose_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad,
GstPad * pad, GstCaps * caps, GstDecodeChain * chain)
{
GstPad *mqpad = NULL;
GST_DEBUG_OBJECT (dbin, "pad %s:%s, chain:%p",
GST_DEBUG_PAD_NAME (pad), chain);
/* If this is the first pad for this chain, there are no other elements
* and the source element is not the multiqueue we must link through the
* multiqueue.
*
* This is the case if a demuxer directly exposed a raw pad.
*/
if (chain->parent && !chain->elements && src != chain->parent->multiqueue) {
GST_LOG_OBJECT (src, "connecting the pad through multiqueue");
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), NULL);
if (!(mqpad = gst_decode_group_control_demuxer_pad (chain->parent, pad)))
goto beach;
pad = mqpad;
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), pad);
}
gst_decode_pad_activate (dpad, chain);
chain->endpad = gst_object_ref (dpad);
chain->endcaps = gst_caps_ref (caps);
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain)) {
gst_decode_bin_expose (dbin);
}
EXPOSE_UNLOCK (dbin);
if (mqpad)
gst_object_unref (mqpad);
beach:
return;
}
/* check_upstream_seekable:
*
* Check if upstream is seekable.
*/
static gboolean
check_upstream_seekable (GstDecodeBin * dbin, GstPad * pad)
{
GstQuery *query;
gint64 start = -1, stop = -1;
gboolean seekable = FALSE;
query = gst_query_new_seeking (GST_FORMAT_BYTES);
if (!gst_pad_peer_query (pad, query)) {
GST_DEBUG_OBJECT (dbin, "seeking query failed");
gst_query_unref (query);
return FALSE;
}
gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
gst_query_unref (query);
/* try harder to query upstream size if we didn't get it the first time */
if (seekable && stop == -1) {
GST_DEBUG_OBJECT (dbin, "doing duration query to fix up unset stop");
gst_pad_peer_query_duration (pad, GST_FORMAT_BYTES, &stop);
}
/* if upstream doesn't know the size, it's likely that it's not seekable in
* practice even if it technically may be seekable */
if (seekable && (start != 0 || stop <= start)) {
GST_DEBUG_OBJECT (dbin, "seekable but unknown start/stop -> disable");
return FALSE;
}
GST_DEBUG_OBJECT (dbin, "upstream seekable: %d", seekable);
return seekable;
}
static void
type_found (GstElement * typefind, guint probability,
GstCaps * caps, GstDecodeBin * decode_bin)
{
GstPad *pad, *sink_pad;
GST_DEBUG_OBJECT (decode_bin, "typefind found caps %" GST_PTR_FORMAT, caps);
/* If the typefinder (but not something else) finds text/plain - i.e. that's
* the top-level type of the file - then error out.
*/
if (gst_structure_has_name (gst_caps_get_structure (caps, 0), "text/plain")) {
GST_ELEMENT_ERROR (decode_bin, STREAM, WRONG_TYPE,
(_("This appears to be a text file")),
("decodebin cannot decode plain text files"));
goto exit;
}
/* FIXME: we can only deal with one type, we don't yet support dynamically changing
* caps from the typefind element */
if (decode_bin->have_type || decode_bin->decode_chain)
goto exit;
decode_bin->have_type = TRUE;
pad = gst_element_get_static_pad (typefind, "src");
sink_pad = gst_element_get_static_pad (typefind, "sink");
/* need some lock here to prevent race with shutdown state change
* which might yank away e.g. decode_chain while building stuff here.
* In typical cases, STREAM_LOCK is held and handles that, it need not
* be held (if called from a proxied setcaps), so grab it anyway */
GST_PAD_STREAM_LOCK (sink_pad);
decode_bin->decode_chain = gst_decode_chain_new (decode_bin, NULL, pad);
analyze_new_pad (decode_bin, typefind, pad, caps, decode_bin->decode_chain);
GST_PAD_STREAM_UNLOCK (sink_pad);
gst_object_unref (sink_pad);
gst_object_unref (pad);
exit:
return;
}
static GstPadProbeReturn
pad_event_cb (GstPad * pad, GstPadProbeInfo * info, gpointer data)
{
GstEvent *event = GST_PAD_PROBE_INFO_EVENT (info);
GstPendingPad *ppad = (GstPendingPad *) data;
GstDecodeChain *chain = ppad->chain;
GstDecodeBin *dbin = chain->dbin;
g_assert (ppad);
g_assert (chain);
g_assert (dbin);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_DEBUG_OBJECT (dbin, "Received EOS on a non final pad, this stream "
"ended too early");
chain->deadend = TRUE;
gst_object_replace ((GstObject **) & chain->current_pad, NULL);
/* we don't set the endcaps because NULL endcaps means early EOS */
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain))
gst_decode_bin_expose (dbin);
EXPOSE_UNLOCK (dbin);
break;
default:
break;
}
return GST_PAD_PROBE_OK;
}
static void
pad_added_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain)
{
GstCaps *caps;
GstDecodeBin *dbin;
dbin = chain->dbin;
GST_DEBUG_OBJECT (pad, "pad added, chain:%p", chain);
caps = get_pad_caps (pad);
analyze_new_pad (dbin, element, pad, caps, chain);
if (caps)
gst_caps_unref (caps);
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain)) {
GST_LOG_OBJECT (dbin,
"That was the last dynamic object, now attempting to expose the group");
if (!gst_decode_bin_expose (dbin))
GST_WARNING_OBJECT (dbin, "Couldn't expose group");
}
EXPOSE_UNLOCK (dbin);
}
static void
pad_removed_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain)
{
GList *l;
GST_LOG_OBJECT (pad, "pad removed, chain:%p", chain);
/* In fact, we don't have to do anything here, the active group will be
* removed when the group's multiqueue is drained */
CHAIN_MUTEX_LOCK (chain);
for (l = chain->pending_pads; l; l = l->next) {
GstPendingPad *ppad = l->data;
GstPad *opad = ppad->pad;
if (pad == opad) {
gst_pending_pad_free (ppad);
chain->pending_pads = g_list_delete_link (chain->pending_pads, l);
break;
}
}
CHAIN_MUTEX_UNLOCK (chain);
}
static void
no_more_pads_cb (GstElement * element, GstDecodeChain * chain)
{
GstDecodeGroup *group = NULL;
GST_LOG_OBJECT (element, "got no more pads");
CHAIN_MUTEX_LOCK (chain);
if (!chain->elements
|| ((GstDecodeElement *) chain->elements->data)->element != element) {
GST_LOG_OBJECT (chain->dbin, "no-more-pads from old chain element '%s'",
GST_OBJECT_NAME (element));
CHAIN_MUTEX_UNLOCK (chain);
return;
} else if (!chain->demuxer) {
GST_LOG_OBJECT (chain->dbin, "no-more-pads from a non-demuxer element '%s'",
GST_OBJECT_NAME (element));
CHAIN_MUTEX_UNLOCK (chain);
return;
}
/* when we received no_more_pads, we can complete the pads of the chain */
if (!chain->next_groups && chain->active_group) {
group = chain->active_group;
} else if (chain->next_groups) {
GList *iter;
for (iter = chain->next_groups; iter; iter = g_list_next (iter)) {
group = iter->data;
if (!group->no_more_pads)
break;
}
}
if (!group) {
GST_ERROR_OBJECT (chain->dbin, "can't find group for element");
CHAIN_MUTEX_UNLOCK (chain);
return;
}
GST_DEBUG_OBJECT (element, "Setting group %p to complete", group);
group->no_more_pads = TRUE;
/* this group has prerolled enough to not need more pads,
* we can probably set its buffering state to playing now */
GST_DEBUG_OBJECT (group->dbin, "Setting group %p multiqueue to "
"'playing' buffering mode", group);
decodebin_set_queue_size (group->dbin, group->multiqueue, FALSE,
(group->parent ? group->parent->seekable : TRUE));
CHAIN_MUTEX_UNLOCK (chain);
EXPOSE_LOCK (chain->dbin);
if (gst_decode_chain_is_complete (chain->dbin->decode_chain)) {
gst_decode_bin_expose (chain->dbin);
}
EXPOSE_UNLOCK (chain->dbin);
}
static void
caps_notify_cb (GstPad * pad, GParamSpec * unused, GstDecodeChain * chain)
{
GstElement *element;
GList *l;
GST_LOG_OBJECT (pad, "Notified caps for pad %s:%s", GST_DEBUG_PAD_NAME (pad));
/* Disconnect this; if we still need it, we'll reconnect to this in
* analyze_new_pad */
element = GST_ELEMENT_CAST (gst_pad_get_parent (pad));
CHAIN_MUTEX_LOCK (chain);
for (l = chain->pending_pads; l; l = l->next) {
GstPendingPad *ppad = l->data;
if (ppad->pad == pad) {
gst_pending_pad_free (ppad);
chain->pending_pads = g_list_delete_link (chain->pending_pads, l);
break;
}
}
CHAIN_MUTEX_UNLOCK (chain);
pad_added_cb (element, pad, chain);
gst_object_unref (element);
}
/* Decide whether an element is a demuxer based on the
* klass and number/type of src pad templates it has */
static gboolean
is_demuxer_element (GstElement * srcelement)
{
GstElementFactory *srcfactory;
GstElementClass *elemclass;
GList *walk;
const gchar *klass;
gint potential_src_pads = 0;
srcfactory = gst_element_get_factory (srcelement);
klass =
gst_element_factory_get_metadata (srcfactory, GST_ELEMENT_METADATA_KLASS);
/* Can't be a demuxer unless it has Demux in the klass name */
if (!strstr (klass, "Demux"))
return FALSE;
/* Walk the src pad templates and count how many the element
* might produce */
elemclass = GST_ELEMENT_GET_CLASS (srcelement);
walk = gst_element_class_get_pad_template_list (elemclass);
while (walk != NULL) {
GstPadTemplate *templ;
templ = (GstPadTemplate *) walk->data;
if (GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) {
switch (GST_PAD_TEMPLATE_PRESENCE (templ)) {
case GST_PAD_ALWAYS:
case GST_PAD_SOMETIMES:
if (strstr (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ), "%"))
potential_src_pads += 2; /* Might make multiple pads */
else
potential_src_pads += 1;
break;
case GST_PAD_REQUEST:
potential_src_pads += 2;
break;
}
}
walk = g_list_next (walk);
}
if (potential_src_pads < 2)
return FALSE;
return TRUE;
}
/* Returns TRUE if the caps are compatible with the caps specified in the 'caps'
* property (which by default are the raw caps)
*
* The decodebin_lock should be taken !
*/
static gboolean
are_final_caps (GstDecodeBin * dbin, GstCaps * caps)
{
gboolean res;
GST_LOG_OBJECT (dbin, "Checking with caps %" GST_PTR_FORMAT, caps);
/* lock for getting the caps */
GST_OBJECT_LOCK (dbin);
res = gst_caps_is_subset (caps, dbin->caps);
GST_OBJECT_UNLOCK (dbin);
GST_LOG_OBJECT (dbin, "Caps are %sfinal caps", res ? "" : "not ");
return res;
}
/* gst_decode_bin_reset_buffering:
*
* Enables buffering on the last multiqueue of each group only,
* disabling the rest
*
*/
static void
gst_decode_bin_reset_buffering (GstDecodeBin * dbin)
{
if (!dbin->use_buffering)
return;
GST_DEBUG_OBJECT (dbin, "Reseting multiqueues buffering");
CHAIN_MUTEX_LOCK (dbin->decode_chain);
gst_decode_chain_reset_buffering (dbin->decode_chain);
CHAIN_MUTEX_UNLOCK (dbin->decode_chain);
}
/****
* GstDecodeChain functions
****/
static gboolean
gst_decode_chain_reset_buffering (GstDecodeChain * chain)
{
GstDecodeGroup *group;
group = chain->active_group;
GST_LOG_OBJECT (chain->dbin, "Resetting chain %p buffering, active group: %p",
chain, group);
if (group) {
return gst_decode_group_reset_buffering (group);
}
return FALSE;
}
/* gst_decode_chain_get_current_group:
*
* Returns the current group of this chain, to which
* new chains should be attached or NULL if the last
* group didn't have no-more-pads.
*
* Not MT-safe: Call with parent chain lock!
*/
static GstDecodeGroup *
gst_decode_chain_get_current_group (GstDecodeChain * chain)
{
GstDecodeGroup *group;
if (!chain->next_groups && chain->active_group
&& chain->active_group->overrun && !chain->active_group->no_more_pads) {
GST_WARNING_OBJECT (chain->dbin,
"Currently active group %p is exposed"
" and wants to add a new pad without having signaled no-more-pads",
chain->active_group);
return NULL;
}
if (chain->next_groups && (group = chain->next_groups->data) && group->overrun
&& !group->no_more_pads) {
GST_WARNING_OBJECT (chain->dbin,
"Currently newest pending group %p "
"had overflow but didn't signal no-more-pads", group);
return NULL;
}
/* Now we know that we can really return something useful */
if (!chain->active_group) {
chain->active_group = group = gst_decode_group_new (chain->dbin, chain);
} else if (!chain->active_group->overrun
&& !chain->active_group->no_more_pads) {
group = chain->active_group;
} else {
GList *iter;
group = NULL;
for (iter = chain->next_groups; iter; iter = g_list_next (iter)) {
GstDecodeGroup *next_group = iter->data;
if (!next_group->overrun && !next_group->no_more_pads) {
group = next_group;
break;
}
}
}
if (!group) {
group = gst_decode_group_new (chain->dbin, chain);
chain->next_groups = g_list_append (chain->next_groups, group);
}
return group;
}
static void gst_decode_group_free_internal (GstDecodeGroup * group,
gboolean hide);
static void
gst_decode_chain_free_internal (GstDecodeChain * chain, gboolean hide)
{
GList *l;
CHAIN_MUTEX_LOCK (chain);
GST_DEBUG_OBJECT (chain->dbin, "%s chain %p", (hide ? "Hiding" : "Freeing"),
chain);
if (chain->active_group) {
gst_decode_group_free_internal (chain->active_group, hide);
if (!hide)
chain->active_group = NULL;
}
for (l = chain->next_groups; l; l = l->next) {
gst_decode_group_free_internal ((GstDecodeGroup *) l->data, hide);
if (!hide)
l->data = NULL;
}
if (!hide) {
g_list_free (chain->next_groups);
chain->next_groups = NULL;
}
if (!hide) {
for (l = chain->old_groups; l; l = l->next) {
GstDecodeGroup *group = l->data;
gst_decode_group_free (group);
}
g_list_free (chain->old_groups);
chain->old_groups = NULL;
}
for (l = chain->pending_pads; l; l = l->next) {
GstPendingPad *ppad = l->data;
gst_pending_pad_free (ppad);
l->data = NULL;
}
g_list_free (chain->pending_pads);
chain->pending_pads = NULL;
for (l = chain->elements; l; l = l->next) {
GstDecodeElement *delem = l->data;
GstElement *element = delem->element;
if (delem->pad_added_id)
g_signal_handler_disconnect (element, delem->pad_added_id);
delem->pad_added_id = 0;
if (delem->pad_removed_id)
g_signal_handler_disconnect (element, delem->pad_removed_id);
delem->pad_removed_id = 0;
if (delem->no_more_pads_id)
g_signal_handler_disconnect (element, delem->no_more_pads_id);
delem->no_more_pads_id = 0;
if (delem->capsfilter) {
if (GST_OBJECT_PARENT (delem->capsfilter) ==
GST_OBJECT_CAST (chain->dbin))
gst_bin_remove (GST_BIN_CAST (chain->dbin), delem->capsfilter);
if (!hide) {
gst_element_set_state (delem->capsfilter, GST_STATE_NULL);
}
}
if (GST_OBJECT_PARENT (element) == GST_OBJECT_CAST (chain->dbin))
gst_bin_remove (GST_BIN_CAST (chain->dbin), element);
if (!hide) {
gst_element_set_state (element, GST_STATE_NULL);
}
SUBTITLE_LOCK (chain->dbin);
/* remove possible subtitle element */
chain->dbin->subtitles = g_list_remove (chain->dbin->subtitles, element);
SUBTITLE_UNLOCK (chain->dbin);
if (!hide) {
if (delem->capsfilter) {
gst_object_unref (delem->capsfilter);
delem->capsfilter = NULL;
}
gst_object_unref (element);
l->data = NULL;
g_slice_free (GstDecodeElement, delem);
}
}
if (!hide) {
g_list_free (chain->elements);
chain->elements = NULL;
}
if (chain->endpad) {
if (chain->endpad->exposed) {
gst_element_remove_pad (GST_ELEMENT_CAST (chain->dbin),
GST_PAD_CAST (chain->endpad));
}
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (chain->endpad), NULL);
chain->endpad->exposed = FALSE;
if (!hide) {
gst_object_unref (chain->endpad);
chain->endpad = NULL;
}
}
if (!hide && chain->current_pad) {
gst_object_unref (chain->current_pad);
chain->current_pad = NULL;
}
if (chain->pad) {
gst_object_unref (chain->pad);
chain->pad = NULL;
}
if (chain->endcaps) {
gst_caps_unref (chain->endcaps);
chain->endcaps = NULL;
}
GST_DEBUG_OBJECT (chain->dbin, "%s chain %p", (hide ? "Hidden" : "Freed"),
chain);
CHAIN_MUTEX_UNLOCK (chain);
if (!hide) {
g_mutex_clear (&chain->lock);
g_slice_free (GstDecodeChain, chain);
}
}
/* gst_decode_chain_free:
*
* Completely frees and removes the chain and all
* child groups from decodebin.
*
* MT-safe, don't hold the chain lock or any child chain's lock
* when calling this!
*/
static void
gst_decode_chain_free (GstDecodeChain * chain)
{
gst_decode_chain_free_internal (chain, FALSE);
}
/* gst_decode_chain_new:
*
* Creates a new decode chain and initializes it.
*
* It's up to the caller to add it to the list of child chains of
* a group!
*/
static GstDecodeChain *
gst_decode_chain_new (GstDecodeBin * dbin, GstDecodeGroup * parent,
GstPad * pad)
{
GstDecodeChain *chain = g_slice_new0 (GstDecodeChain);
GST_DEBUG_OBJECT (dbin, "Creating new chain %p with parent group %p", chain,
parent);
chain->dbin = dbin;
chain->parent = parent;
g_mutex_init (&chain->lock);
chain->pad = gst_object_ref (pad);
return chain;
}
/****
* GstDecodeGroup functions
****/
/* The overrun callback is used to expose groups that have not yet had their
* no_more_pads called while the (large) multiqueue overflowed. When this
* happens we must assume that the no_more_pads will not arrive anymore and we
* must expose the pads that we have.
*/
static void
multi_queue_overrun_cb (GstElement * queue, GstDecodeGroup * group)
{
GstDecodeBin *dbin;
dbin = group->dbin;
GST_LOG_OBJECT (dbin, "multiqueue '%s' (%p) is full", GST_OBJECT_NAME (queue),
queue);
group->overrun = TRUE;
/* this group has prerolled enough to not need more pads,
* we can probably set its buffering state to playing now */
GST_DEBUG_OBJECT (group->dbin, "Setting group %p multiqueue to "
"'playing' buffering mode", group);
decodebin_set_queue_size (group->dbin, group->multiqueue, FALSE,
(group->parent ? group->parent->seekable : TRUE));
/* FIXME: We should make sure that everything gets exposed now
* even if child chains are not complete because the will never
* be complete! Ignore any non-complete chains when exposing
* and never expose them later
*/
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain)) {
if (!gst_decode_bin_expose (dbin))
GST_WARNING_OBJECT (dbin, "Couldn't expose group");
}
EXPOSE_UNLOCK (group->dbin);
}
static void
gst_decode_group_free_internal (GstDecodeGroup * group, gboolean hide)
{
GList *l;
GST_DEBUG_OBJECT (group->dbin, "%s group %p", (hide ? "Hiding" : "Freeing"),
group);
for (l = group->children; l; l = l->next) {
GstDecodeChain *chain = (GstDecodeChain *) l->data;
gst_decode_chain_free_internal (chain, hide);
if (!hide)
l->data = NULL;
}
if (!hide) {
g_list_free (group->children);
group->children = NULL;
}
if (!hide) {
for (l = group->reqpads; l; l = l->next) {
GstPad *pad = l->data;
gst_element_release_request_pad (group->multiqueue, pad);
gst_object_unref (pad);
l->data = NULL;
}
g_list_free (group->reqpads);
group->reqpads = NULL;
}
if (group->multiqueue) {
if (group->overrunsig) {
g_signal_handler_disconnect (group->multiqueue, group->overrunsig);
group->overrunsig = 0;
}
if (GST_OBJECT_PARENT (group->multiqueue) == GST_OBJECT_CAST (group->dbin))
gst_bin_remove (GST_BIN_CAST (group->dbin), group->multiqueue);
if (!hide) {
gst_element_set_state (group->multiqueue, GST_STATE_NULL);
gst_object_unref (group->multiqueue);
group->multiqueue = NULL;
}
}
GST_DEBUG_OBJECT (group->dbin, "%s group %p", (hide ? "Hided" : "Freed"),
group);
if (!hide)
g_slice_free (GstDecodeGroup, group);
}
/* gst_decode_group_free:
*
* Completely frees and removes the decode group and all
* it's children.
*
* Never call this from any streaming thread!
*
* Not MT-safe, call with parent's chain lock!
*/
static void
gst_decode_group_free (GstDecodeGroup * group)
{
gst_decode_group_free_internal (group, FALSE);
}
/* gst_decode_group_hide:
*
* Hide the decode group only, this means that
* all child endpads are removed from decodebin
* and all signals are unconnected.
*
* No element is set to NULL state and completely
* unrefed here.
*
* Can be called from streaming threads.
*
* Not MT-safe, call with parent's chain lock!
*/
static void
gst_decode_group_hide (GstDecodeGroup * group)
{
gst_decode_group_free_internal (group, TRUE);
}
/* configure queue sizes, this depends on the buffering method and if we are
* playing or prerolling. */
static void
decodebin_set_queue_size (GstDecodeBin * dbin, GstElement * multiqueue,
gboolean preroll, gboolean seekable)
{
guint max_bytes, max_buffers;
guint64 max_time;
gboolean use_buffering;
/* get the current config from the multiqueue */
g_object_get (multiqueue, "use-buffering", &use_buffering, NULL);
GST_DEBUG_OBJECT (multiqueue, "use buffering %d", use_buffering);
if (preroll || use_buffering) {
/* takes queue limits, initially we only queue up up to the max bytes limit,
* with a default of 2MB. we use the same values for buffering mode. */
if ((max_bytes = dbin->max_size_bytes) == 0)
max_bytes = AUTO_PREROLL_SIZE_BYTES;
if ((max_buffers = dbin->max_size_buffers) == 0)
max_buffers = AUTO_PREROLL_SIZE_BUFFERS;
if ((max_time = dbin->max_size_time) == 0)
max_time = seekable ? AUTO_PREROLL_SEEKABLE_SIZE_TIME :
AUTO_PREROLL_NOT_SEEKABLE_SIZE_TIME;
} else {
/* update runtime limits. At runtime, we try to keep the amount of buffers
* in the queues as low as possible (but at least 5 buffers). */
if (dbin->use_buffering)
max_bytes = 0;
else if ((max_bytes = dbin->max_size_bytes) == 0)
max_bytes = AUTO_PLAY_SIZE_BYTES;
if ((max_buffers = dbin->max_size_buffers) == 0)
max_buffers = AUTO_PLAY_SIZE_BUFFERS;
/* this is a multiqueue with disabled buffering, don't limit max_time */
if (dbin->use_buffering)
max_time = 0;
else if ((max_time = dbin->max_size_time) == 0)
max_time = AUTO_PLAY_SIZE_TIME;
}
GST_DEBUG_OBJECT (multiqueue, "setting limits %u bytes, %u buffers, "
"%" G_GUINT64_FORMAT, max_bytes, max_buffers, max_time);
g_object_set (multiqueue,
"max-size-bytes", max_bytes, "max-size-time", max_time,
"max-size-buffers", max_buffers, NULL);
}
/* gst_decode_group_new:
* @dbin: Parent decodebin
* @parent: Parent chain or %NULL
*
* Creates a new GstDecodeGroup. It is up to the caller to add it to the list
* of groups.
*/
static GstDecodeGroup *
gst_decode_group_new (GstDecodeBin * dbin, GstDecodeChain * parent)
{
GstDecodeGroup *group = g_slice_new0 (GstDecodeGroup);
GstElement *mq;
gboolean seekable;
GST_DEBUG_OBJECT (dbin, "Creating new group %p with parent chain %p", group,
parent);
group->dbin = dbin;
group->parent = parent;
mq = group->multiqueue = gst_element_factory_make ("multiqueue", NULL);
if (G_UNLIKELY (!group->multiqueue))
goto missing_multiqueue;
/* default is for use-buffering is FALSE */
if (dbin->use_buffering) {
g_object_set (mq,
"use-buffering", TRUE,
"low-percent", dbin->low_percent,
"high-percent", dbin->high_percent, NULL);
}
/* configure queue sizes for preroll */
seekable = FALSE;
if (parent && parent->demuxer) {
GstElement *element =
((GstDecodeElement *) parent->elements->data)->element;
GstPad *pad = gst_element_get_static_pad (element, "sink");
if (pad) {
seekable = parent->seekable = check_upstream_seekable (dbin, pad);
gst_object_unref (pad);
}
}
decodebin_set_queue_size (dbin, mq, TRUE, seekable);
group->overrunsig = g_signal_connect (mq, "overrun",
G_CALLBACK (multi_queue_overrun_cb), group);
gst_element_set_state (mq, GST_STATE_PAUSED);
gst_bin_add (GST_BIN (dbin), gst_object_ref (mq));
return group;
/* ERRORS */
missing_multiqueue:
{
gst_element_post_message (GST_ELEMENT_CAST (dbin),
gst_missing_element_message_new (GST_ELEMENT_CAST (dbin),
"multiqueue"));
GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), ("no multiqueue!"));
g_slice_free (GstDecodeGroup, group);
return NULL;
}
}
/* gst_decode_group_control_demuxer_pad
*
* Adds a new demuxer srcpad to the given group.
*
* Returns the srcpad of the multiqueue corresponding the given pad.
* Returns NULL if there was an error.
*/
static GstPad *
gst_decode_group_control_demuxer_pad (GstDecodeGroup * group, GstPad * pad)
{
GstDecodeBin *dbin;
GstPad *srcpad, *sinkpad;
GstIterator *it = NULL;
GValue item = { 0, };
dbin = group->dbin;
GST_LOG_OBJECT (dbin, "group:%p pad %s:%s", group, GST_DEBUG_PAD_NAME (pad));
srcpad = NULL;
if (G_UNLIKELY (!group->multiqueue))
return NULL;
if (!(sinkpad = gst_element_get_request_pad (group->multiqueue, "sink_%u"))) {
GST_ERROR_OBJECT (dbin, "Couldn't get sinkpad from multiqueue");
return NULL;
}
if ((gst_pad_link (pad, sinkpad) != GST_PAD_LINK_OK)) {
GST_ERROR_OBJECT (dbin, "Couldn't link demuxer and multiqueue");
goto error;
}
it = gst_pad_iterate_internal_links (sinkpad);
if (!it || (gst_iterator_next (it, &item)) != GST_ITERATOR_OK
|| ((srcpad = g_value_dup_object (&item)) == NULL)) {
GST_ERROR_OBJECT (dbin,
"Couldn't get srcpad from multiqueue for sinkpad %" GST_PTR_FORMAT,
sinkpad);
goto error;
}
CHAIN_MUTEX_LOCK (group->parent);
group->reqpads = g_list_prepend (group->reqpads, gst_object_ref (sinkpad));
CHAIN_MUTEX_UNLOCK (group->parent);
beach:
if (G_IS_VALUE (&item))
g_value_unset (&item);
if (it)
gst_iterator_free (it);
gst_object_unref (sinkpad);
return srcpad;
error:
gst_element_release_request_pad (group->multiqueue, sinkpad);
goto beach;
}
/* gst_decode_group_is_complete:
*
* Checks if the group is complete, this means that
* a) overrun of the multiqueue or no-more-pads happened
* b) all child chains are complete
*
* Not MT-safe, always call with decodebin expose lock
*/
static gboolean
gst_decode_group_is_complete (GstDecodeGroup * group)
{
GList *l;
gboolean complete = TRUE;
if (!group->overrun && !group->no_more_pads) {
complete = FALSE;
goto out;
}
for (l = group->children; l; l = l->next) {
GstDecodeChain *chain = l->data;
if (!gst_decode_chain_is_complete (chain)) {
complete = FALSE;
goto out;
}
}
out:
GST_DEBUG_OBJECT (group->dbin, "Group %p is complete: %d", group, complete);
return complete;
}
/* gst_decode_chain_is_complete:
*
* Returns TRUE if the chain is complete, this means either
* a) This chain is a dead end, i.e. we have no suitable plugins
* b) This chain ends in an endpad and this is blocked or exposed
*
* Not MT-safe, always call with decodebin expose lock
*/
static gboolean
gst_decode_chain_is_complete (GstDecodeChain * chain)
{
gboolean complete = FALSE;
CHAIN_MUTEX_LOCK (chain);
if (chain->dbin->shutdown)
goto out;
if (chain->deadend) {
complete = TRUE;
goto out;
}
if (chain->endpad && (chain->endpad->blocked || chain->endpad->exposed)) {
complete = TRUE;
goto out;
}
if (chain->demuxer) {
if (chain->active_group
&& gst_decode_group_is_complete (chain->active_group)) {
complete = TRUE;
goto out;
}
}
out:
CHAIN_MUTEX_UNLOCK (chain);
GST_DEBUG_OBJECT (chain->dbin, "Chain %p is complete: %d", chain, complete);
return complete;
}
static gboolean
drain_and_switch_chains (GstDecodeChain * chain, GstDecodePad * drainpad,
gboolean * last_group, gboolean * drained, gboolean * switched);
/* drain_and_switch_chains/groups:
*
* CALL WITH CHAIN LOCK (or group parent) TAKEN !
*
* Goes down the chains/groups until it finds the chain
* to which the drainpad belongs.
*
* It marks that pad/chain as drained and then will figure
* out which group to switch to or not.
*
* last_chain will be set to TRUE if the group to which the
* pad belongs is the last one.
*
* drained will be set to TRUE if the chain/group is drained.
*
* Returns: TRUE if the chain contained the target pad */
static gboolean
drain_and_switch_group (GstDecodeGroup * group, GstDecodePad * drainpad,
gboolean * last_group, gboolean * drained, gboolean * switched)
{
gboolean handled = FALSE;
GList *tmp;
GST_DEBUG ("Checking group %p (target pad %s:%s)",
group, GST_DEBUG_PAD_NAME (drainpad));
/* Definitely can't be in drained groups */
if (G_UNLIKELY (group->drained)) {
goto beach;
}
/* Figure out if all our chains are drained with the
* new information */
group->drained = TRUE;
for (tmp = group->children; tmp; tmp = tmp->next) {
GstDecodeChain *chain = (GstDecodeChain *) tmp->data;
gboolean subdrained = FALSE;
handled |=
drain_and_switch_chains (chain, drainpad, last_group, &subdrained,
switched);
if (!subdrained)
group->drained = FALSE;
}
beach:
GST_DEBUG ("group %p (last_group:%d, drained:%d, switched:%d, handled:%d)",
group, *last_group, group->drained, *switched, handled);
*drained = group->drained;
return handled;
}
static gboolean
drain_and_switch_chains (GstDecodeChain * chain, GstDecodePad * drainpad,
gboolean * last_group, gboolean * drained, gboolean * switched)
{
gboolean handled = FALSE;
GstDecodeBin *dbin = chain->dbin;
GST_DEBUG ("Checking chain %p (target pad %s:%s)",
chain, GST_DEBUG_PAD_NAME (drainpad));
CHAIN_MUTEX_LOCK (chain);
/* Definitely can't be in drained chains */
if (G_UNLIKELY (chain->drained)) {
goto beach;
}
if (chain->endpad) {
/* Check if we're reached the target endchain */
if (chain == drainpad->chain) {
GST_DEBUG ("Found the target chain");
drainpad->drained = TRUE;
handled = TRUE;
}
chain->drained = chain->endpad->drained;
goto beach;
}
/* We known there are groups to switch to */
if (chain->next_groups)
*last_group = FALSE;
/* Check the active group */
if (chain->active_group) {
gboolean subdrained = FALSE;
handled = drain_and_switch_group (chain->active_group, drainpad,
last_group, &subdrained, switched);
/* The group is drained, see if we can switch to another */
if (handled && subdrained && !*switched) {
if (chain->next_groups) {
/* Switch to next group */
GST_DEBUG_OBJECT (dbin, "Hiding current group %p", chain->active_group);
gst_decode_group_hide (chain->active_group);
chain->old_groups =
g_list_prepend (chain->old_groups, chain->active_group);
GST_DEBUG_OBJECT (dbin, "Switching to next group %p",
chain->next_groups->data);
chain->active_group = chain->next_groups->data;
chain->next_groups =
g_list_delete_link (chain->next_groups, chain->next_groups);
*switched = TRUE;
chain->drained = FALSE;
} else {
GST_DEBUG ("Group %p was the last in chain %p", chain->active_group,
chain);
chain->drained = TRUE;
/* We're drained ! */
}
} else {
if (subdrained && !chain->next_groups)
*drained = TRUE;
}
}
beach:
CHAIN_MUTEX_UNLOCK (chain);
GST_DEBUG ("Chain %p (handled:%d, last_group:%d, drained:%d, switched:%d)",
chain, handled, *last_group, chain->drained, *switched);
*drained = chain->drained;
if (*drained)
g_signal_emit (dbin, gst_decode_bin_signals[SIGNAL_DRAINED], 0, NULL);
return handled;
}
/* check if the group is drained, meaning all pads have seen an EOS
* event. */
static gboolean
gst_decode_pad_handle_eos (GstDecodePad * pad)
{
gboolean last_group = TRUE;
gboolean switched = FALSE;
gboolean drained = FALSE;
GstDecodeChain *chain = pad->chain;
GstDecodeBin *dbin = chain->dbin;
GST_LOG_OBJECT (dbin, "pad %p", pad);
drain_and_switch_chains (dbin->decode_chain, pad, &last_group, &drained,
&switched);
if (switched) {
/* If we resulted in a group switch, expose what's needed */
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain))
gst_decode_bin_expose (dbin);
EXPOSE_UNLOCK (dbin);
}
return last_group;
}
/* gst_decode_group_is_drained:
*
* Check is this group is drained and cache this result.
* The group is drained if all child chains are drained.
*
* Not MT-safe, call with group->parent's lock */
static gboolean
gst_decode_group_is_drained (GstDecodeGroup * group)
{
GList *l;
gboolean drained = TRUE;
if (group->drained) {
drained = TRUE;
goto out;
}
for (l = group->children; l; l = l->next) {
GstDecodeChain *chain = l->data;
CHAIN_MUTEX_LOCK (chain);
if (!gst_decode_chain_is_drained (chain))
drained = FALSE;
CHAIN_MUTEX_UNLOCK (chain);
if (!drained)
goto out;
}
group->drained = drained;
out:
GST_DEBUG_OBJECT (group->dbin, "Group %p is drained: %d", group, drained);
return drained;
}
/* gst_decode_chain_is_drained:
*
* Check is the chain is drained, which means that
* either
*
* a) it's endpad is drained
* b) there are no pending pads, the active group is drained
* and there are no next groups
*
* Not MT-safe, call with chain lock
*/
static gboolean
gst_decode_chain_is_drained (GstDecodeChain * chain)
{
gboolean drained = FALSE;
if (chain->endpad) {
drained = chain->endpad->drained;
goto out;
}
if (chain->pending_pads) {
drained = FALSE;
goto out;
}
if (chain->active_group && gst_decode_group_is_drained (chain->active_group)
&& !chain->next_groups) {
drained = TRUE;
goto out;
}
out:
GST_DEBUG_OBJECT (chain->dbin, "Chain %p is drained: %d", chain, drained);
return drained;
}
static gboolean
gst_decode_group_reset_buffering (GstDecodeGroup * group)
{
GList *l;
gboolean ret = TRUE;
GST_DEBUG_OBJECT (group->dbin, "Group reset buffering %p %s", group,
GST_ELEMENT_NAME (group->multiqueue));
for (l = group->children; l; l = l->next) {
GstDecodeChain *chain = l->data;
CHAIN_MUTEX_LOCK (chain);
if (!gst_decode_chain_reset_buffering (chain)) {
ret = FALSE;
}
CHAIN_MUTEX_UNLOCK (chain);
}
if (ret) {
/* all chains are buffering already, no need to do it here */
g_object_set (group->multiqueue, "use-buffering", FALSE, NULL);
} else {
g_object_set (group->multiqueue, "use-buffering", TRUE, NULL);
}
decodebin_set_queue_size (group->dbin, group->multiqueue, FALSE, FALSE);
GST_DEBUG_OBJECT (group->dbin, "Setting %s buffering to %d",
GST_ELEMENT_NAME (group->multiqueue), !ret);
return TRUE;
}
/* sort_end_pads:
* GCompareFunc to use with lists of GstPad.
* Sorts pads by mime type.
* First video (raw, then non-raw), then audio (raw, then non-raw),
* then others.
*
* Return: negative if a<b, 0 if a==b, positive if a>b
*/
static gint
sort_end_pads (GstDecodePad * da, GstDecodePad * db)
{
gint va, vb;
GstCaps *capsa, *capsb;
GstStructure *sa, *sb;
const gchar *namea, *nameb;
gchar *ida, *idb;
gint ret;
capsa = get_pad_caps (GST_PAD_CAST (da));
capsb = get_pad_caps (GST_PAD_CAST (db));
sa = gst_caps_get_structure ((const GstCaps *) capsa, 0);
sb = gst_caps_get_structure ((const GstCaps *) capsb, 0);
namea = gst_structure_get_name (sa);
nameb = gst_structure_get_name (sb);
if (g_strrstr (namea, "video/x-raw"))
va = 0;
else if (g_strrstr (namea, "video/"))
va = 1;
else if (g_strrstr (namea, "audio/x-raw"))
va = 2;
else if (g_strrstr (namea, "audio/"))
va = 3;
else
va = 4;
if (g_strrstr (nameb, "video/x-raw"))
vb = 0;
else if (g_strrstr (nameb, "video/"))
vb = 1;
else if (g_strrstr (nameb, "audio/x-raw"))
vb = 2;
else if (g_strrstr (nameb, "audio/"))
vb = 3;
else
vb = 4;
gst_caps_unref (capsa);
gst_caps_unref (capsb);
if (va != vb)
return va - vb;
/* if otherwise the same, sort by stream-id */
ida = gst_pad_get_stream_id (GST_PAD_CAST (da));
idb = gst_pad_get_stream_id (GST_PAD_CAST (db));
ret = (ida) ? ((idb) ? strcmp (ida, idb) : -1) : 1;
g_free (ida);
g_free (idb);
return ret;
}
static GstCaps *
_gst_element_get_linked_caps (GstElement * src, GstElement * sink,
GstPad ** srcpad)
{
GstIterator *it;
GstElement *parent;
GstPad *pad, *peer;
gboolean done = FALSE;
GstCaps *caps = NULL;
GValue item = { 0, };
it = gst_element_iterate_src_pads (src);
while (!done) {
switch (gst_iterator_next (it, &item)) {
case GST_ITERATOR_OK:
pad = g_value_get_object (&item);
peer = gst_pad_get_peer (pad);
if (peer) {
parent = gst_pad_get_parent_element (peer);
if (parent == sink) {
caps = gst_pad_get_current_caps (pad);
if (srcpad) {
gst_object_ref (pad);
*srcpad = pad;
}
done = TRUE;
}
if (parent)
gst_object_unref (parent);
gst_object_unref (peer);
}
g_value_reset (&item);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (it);
break;
case GST_ITERATOR_ERROR:
case GST_ITERATOR_DONE:
done = TRUE;
break;
}
}
g_value_unset (&item);
gst_iterator_free (it);
return caps;
}
static GQuark topology_structure_name = 0;
static GQuark topology_caps = 0;
static GQuark topology_next = 0;
static GQuark topology_pad = 0;
static GQuark topology_element_srcpad = 0;
/* FIXME: Invent gst_structure_take_structure() to prevent all the
* structure copying for nothing
*/
static GstStructure *
gst_decode_chain_get_topology (GstDecodeChain * chain)
{
GstStructure *s, *u;
GList *l;
GstCaps *caps;
if (G_UNLIKELY ((chain->endpad || chain->deadend)
&& (chain->endcaps == NULL))) {
GST_WARNING ("End chain without valid caps !");
return NULL;
}
u = gst_structure_new_id_empty (topology_structure_name);
/* Now at the last element */
if ((chain->elements || !chain->active_group) &&
(chain->endpad || chain->deadend)) {
s = gst_structure_new_id_empty (topology_structure_name);
gst_structure_id_set (u, topology_caps, GST_TYPE_CAPS, chain->endcaps,
NULL);
if (chain->endpad) {
gst_structure_id_set (u, topology_pad, GST_TYPE_PAD, chain->endpad, NULL);
gst_structure_id_set (u, topology_element_srcpad, GST_TYPE_PAD,
chain->endpad, NULL);
}
gst_structure_id_set (s, topology_next, GST_TYPE_STRUCTURE, u, NULL);
gst_structure_free (u);
u = s;
} else if (chain->active_group) {
GValue list = { 0, };
GValue item = { 0, };
g_value_init (&list, GST_TYPE_LIST);
g_value_init (&item, GST_TYPE_STRUCTURE);
for (l = chain->active_group->children; l; l = l->next) {
s = gst_decode_chain_get_topology (l->data);
if (s) {
gst_value_set_structure (&item, s);
gst_value_list_append_value (&list, &item);
g_value_reset (&item);
gst_structure_free (s);
}
}
gst_structure_id_set_value (u, topology_next, &list);
g_value_unset (&list);
g_value_unset (&item);
}
/* Get caps between all elements in this chain */
l = (chain->elements && chain->elements->next) ? chain->elements : NULL;
for (; l && l->next; l = l->next) {
GstDecodeElement *delem, *delem_next;
GstElement *elem, *elem_next;
GstCaps *caps;
GstPad *srcpad;
delem = l->data;
elem = delem->element;
delem_next = l->next->data;
elem_next = delem_next->element;
srcpad = NULL;
caps = _gst_element_get_linked_caps (elem_next, elem, &srcpad);
if (caps) {
s = gst_structure_new_id_empty (topology_structure_name);
gst_structure_id_set (u, topology_caps, GST_TYPE_CAPS, caps, NULL);
gst_caps_unref (caps);
gst_structure_id_set (s, topology_next, GST_TYPE_STRUCTURE, u, NULL);
gst_structure_free (u);
u = s;
}
if (srcpad) {
gst_structure_id_set (u, topology_element_srcpad, GST_TYPE_PAD, srcpad,
NULL);
gst_object_unref (srcpad);
}
}
/* Caps that resulted in this chain */
caps = gst_pad_get_current_caps (chain->pad);
if (!caps) {
caps = get_pad_caps (chain->pad);
if (G_UNLIKELY (!gst_caps_is_fixed (caps))) {
GST_ERROR_OBJECT (chain->pad,
"Couldn't get fixed caps, got %" GST_PTR_FORMAT, caps);
gst_caps_unref (caps);
caps = NULL;
}
}
gst_structure_id_set (u, topology_caps, GST_TYPE_CAPS, caps, NULL);
gst_structure_id_set (u, topology_element_srcpad, GST_TYPE_PAD, chain->pad,
NULL);
gst_caps_unref (caps);
return u;
}
static void
gst_decode_bin_post_topology_message (GstDecodeBin * dbin)
{
GstStructure *s;
GstMessage *msg;
s = gst_decode_chain_get_topology (dbin->decode_chain);
msg = gst_message_new_element (GST_OBJECT (dbin), s);
gst_element_post_message (GST_ELEMENT (dbin), msg);
}
static gboolean
debug_sticky_event (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GST_DEBUG_OBJECT (pad, "sticky event %s", GST_EVENT_TYPE_NAME (*event));
return TRUE;
}
/* Must only be called if the toplevel chain is complete and blocked! */
/* Not MT-safe, call with decodebin expose lock! */
static gboolean
gst_decode_bin_expose (GstDecodeBin * dbin)
{
GList *tmp, *endpads = NULL;
gboolean missing_plugin = FALSE;
gboolean already_exposed = TRUE;
GST_DEBUG_OBJECT (dbin, "Exposing currently active chains/groups");
/* Don't expose if we're currently shutting down */
DYN_LOCK (dbin);
if (G_UNLIKELY (dbin->shutdown == TRUE)) {
GST_WARNING_OBJECT (dbin, "Currently, shutting down, aborting exposing");
DYN_UNLOCK (dbin);
return FALSE;
}
DYN_UNLOCK (dbin);
/* Get the pads that we're going to expose and mark things as exposed */
if (!gst_decode_chain_expose (dbin->decode_chain, &endpads, &missing_plugin)) {
g_list_foreach (endpads, (GFunc) gst_object_unref, NULL);
g_list_free (endpads);
GST_ERROR_OBJECT (dbin, "Broken chain/group tree");
g_return_val_if_reached (FALSE);
return FALSE;
}
if (endpads == NULL) {
if (missing_plugin) {
GST_WARNING_OBJECT (dbin, "No suitable plugins found");
GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL),
("no suitable plugins found"));
} else {
/* in this case, the stream ended without buffers,
* just post a warning */
GST_WARNING_OBJECT (dbin, "All streams finished without buffers");
GST_ELEMENT_ERROR (dbin, STREAM, FAILED, (NULL),
("all streams without buffers"));
}
return FALSE;
}
/* Check if this was called when everything was exposed already */
for (tmp = endpads; tmp && already_exposed; tmp = tmp->next) {
GstDecodePad *dpad = tmp->data;
already_exposed &= dpad->exposed;
if (!already_exposed)
break;
}
if (already_exposed) {
GST_DEBUG_OBJECT (dbin, "Everything was exposed already!");
g_list_foreach (endpads, (GFunc) gst_object_unref, NULL);
g_list_free (endpads);
return TRUE;
}
/* going to expose something, reset buffering */
gst_decode_bin_reset_buffering (dbin);
/* Set all already exposed pads to blocked */
for (tmp = endpads; tmp; tmp = tmp->next) {
GstDecodePad *dpad = tmp->data;
if (dpad->exposed) {
GST_DEBUG_OBJECT (dpad, "blocking exposed pad");
gst_decode_pad_set_blocked (dpad, TRUE);
}
}
/* re-order pads : video, then audio, then others */
endpads = g_list_sort (endpads, (GCompareFunc) sort_end_pads);
/* Expose pads */
for (tmp = endpads; tmp; tmp = tmp->next) {
GstDecodePad *dpad = (GstDecodePad *) tmp->data;
gchar *padname;
/* 1. rewrite name */
padname = g_strdup_printf ("src_%u", dbin->nbpads);
dbin->nbpads++;
GST_DEBUG_OBJECT (dbin, "About to expose dpad %s as %s",
GST_OBJECT_NAME (dpad), padname);
gst_object_set_name (GST_OBJECT (dpad), padname);
g_free (padname);
gst_pad_sticky_events_foreach (GST_PAD_CAST (dpad), debug_sticky_event,
dpad);
/* 2. activate and add */
if (!dpad->exposed) {
dpad->exposed = TRUE;
if (!gst_element_add_pad (GST_ELEMENT (dbin), GST_PAD_CAST (dpad))) {
/* not really fatal, we can try to add the other pads */
g_warning ("error adding pad to decodebin");
dpad->exposed = FALSE;
continue;
}
}
/* 3. emit signal */
GST_INFO_OBJECT (dpad, "added new decoded pad");
}
/* 4. Signal no-more-pads. This allows the application to hook stuff to the
* exposed pads */
GST_LOG_OBJECT (dbin, "signaling no-more-pads");
gst_element_no_more_pads (GST_ELEMENT (dbin));
/* 5. Send a custom element message with the stream topology */
if (dbin->post_stream_topology)
gst_decode_bin_post_topology_message (dbin);
/* 6. Unblock internal pads. The application should have connected stuff now
* so that streaming can continue. */
for (tmp = endpads; tmp; tmp = tmp->next) {
GstDecodePad *dpad = (GstDecodePad *) tmp->data;
GST_DEBUG_OBJECT (dpad, "unblocking");
gst_decode_pad_unblock (dpad);
GST_DEBUG_OBJECT (dpad, "unblocked");
gst_object_unref (dpad);
}
g_list_free (endpads);
do_async_done (dbin);
GST_DEBUG_OBJECT (dbin, "Exposed everything");
return TRUE;
}
/* gst_decode_chain_expose:
*
* Check if the chain can be exposed and add all endpads
* to the endpads list.
*
* Also update the active group's multiqueue to the
* runtime limits.
*
* Not MT-safe, call with decodebin expose lock! *
*/
static gboolean
gst_decode_chain_expose (GstDecodeChain * chain, GList ** endpads,
gboolean * missing_plugin)
{
GstDecodeGroup *group;
GList *l;
GstDecodeBin *dbin;
if (chain->deadend) {
if (chain->endcaps)
*missing_plugin = TRUE;
return TRUE;
}
if (chain->endpad) {
if (!chain->endpad->blocked && !chain->endpad->exposed)
return FALSE;
*endpads = g_list_prepend (*endpads, gst_object_ref (chain->endpad));
return TRUE;
}
group = chain->active_group;
if (!group)
return FALSE;
if (!group->no_more_pads && !group->overrun)
return FALSE;
dbin = group->dbin;
/* configure queues for playback */
decodebin_set_queue_size (dbin, group->multiqueue, FALSE, TRUE);
/* we can now disconnect any overrun signal, which is used to expose the
* group. */
if (group->overrunsig) {
GST_LOG_OBJECT (dbin, "Disconnecting overrun");
g_signal_handler_disconnect (group->multiqueue, group->overrunsig);
group->overrunsig = 0;
}
for (l = group->children; l; l = l->next) {
GstDecodeChain *childchain = l->data;
if (!gst_decode_chain_expose (childchain, endpads, missing_plugin))
return FALSE;
}
return TRUE;
}
/*************************
* GstDecodePad functions
*************************/
static void
gst_decode_pad_class_init (GstDecodePadClass * klass)
{
}
static void
gst_decode_pad_init (GstDecodePad * pad)
{
pad->chain = NULL;
pad->blocked = FALSE;
pad->exposed = FALSE;
pad->drained = FALSE;
gst_object_ref_sink (pad);
}
static GstPadProbeReturn
source_pad_blocked_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstDecodePad *dpad = user_data;
GstDecodeChain *chain;
GstDecodeBin *dbin;
GstPadProbeReturn ret = GST_PAD_PROBE_OK;
if (GST_PAD_PROBE_INFO_TYPE (info) & GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) {
GstEvent *event = GST_PAD_PROBE_INFO_EVENT (info);
GST_LOG_OBJECT (pad, "Seeing event '%s'", GST_EVENT_TYPE_NAME (event));
if (!GST_EVENT_IS_SERIALIZED (event)) {
/* do not block on sticky or out of band events otherwise the allocation query
from demuxer might block the loop thread */
GST_LOG_OBJECT (pad, "Letting OOB event through");
return GST_PAD_PROBE_PASS;
}
if (GST_EVENT_IS_STICKY (event) && GST_EVENT_TYPE (event) != GST_EVENT_EOS) {
/* manually push sticky events to ghost pad to avoid exposing pads
* that don't have the sticky events. Handle EOS separately as we
* want to block the pad on it if we didn't get any buffers before
* EOS and expose the pad then. */
gst_pad_push_event (GST_PAD_CAST (dpad), gst_event_ref (event));
/* let the sticky events pass */
ret = GST_PAD_PROBE_PASS;
/* we only want to try to expose on CAPS events */
if (GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
GST_LOG_OBJECT (pad, "Letting sticky non-CAPS event through");
goto done;
}
}
} else if (GST_PAD_PROBE_INFO_TYPE (info) &
GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM) {
GstQuery *query = GST_PAD_PROBE_INFO_QUERY (info);
if (!GST_QUERY_IS_SERIALIZED (query)) {
/* do not block on non-serialized queries */
GST_LOG_OBJECT (pad, "Letting non-serialized query through");
return GST_PAD_PROBE_PASS;
}
if (!gst_pad_has_current_caps (pad)) {
/* do not block on allocation queries before we have caps,
* this would deadlock because we are doing no autoplugging
* without caps.
* TODO: Try to do autoplugging based on the query caps
*/
GST_LOG_OBJECT (pad, "Letting serialized query before caps through");
return GST_PAD_PROBE_PASS;
}
}
chain = dpad->chain;
dbin = chain->dbin;
GST_LOG_OBJECT (dpad, "blocked: dpad->chain:%p", chain);
dpad->blocked = TRUE;
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain)) {
if (!gst_decode_bin_expose (dbin))
GST_WARNING_OBJECT (dbin, "Couldn't expose group");
}
EXPOSE_UNLOCK (dbin);
done:
return ret;
}
static GstPadProbeReturn
source_pad_event_probe (GstPad * pad, GstPadProbeInfo * info,
gpointer user_data)
{
GstEvent *event = GST_PAD_PROBE_INFO_EVENT (info);
GstDecodePad *dpad = user_data;
gboolean res = TRUE;
GST_LOG_OBJECT (pad, "%s dpad:%p", GST_EVENT_TYPE_NAME (event), dpad);
if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
GST_DEBUG_OBJECT (pad, "we received EOS");
/* Check if all pads are drained.
* * If there is no next group, we will let the EOS go through.
* * If there is a next group but the current group isn't completely
* drained, we will drop the EOS event.
* * If there is a next group to expose and this was the last non-drained
* pad for that group, we will remove the ghostpad of the current group
* first, which unlinks the peer and so drops the EOS. */
res = gst_decode_pad_handle_eos (dpad);
}
if (res)
return GST_PAD_PROBE_OK;
else
return GST_PAD_PROBE_DROP;
}
static void
gst_decode_pad_set_blocked (GstDecodePad * dpad, gboolean blocked)
{
GstDecodeBin *dbin = dpad->dbin;
GstPad *opad;
DYN_LOCK (dbin);
GST_DEBUG_OBJECT (dpad, "blocking pad: %d", blocked);
opad = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (dpad));
if (!opad)
goto out;
/* do not block if shutting down.
* we do not consider/expect it blocked further below, but use other trick */
if (!blocked || !dbin->shutdown) {
if (blocked) {
if (dpad->block_id == 0)
dpad->block_id =
gst_pad_add_probe (opad,
GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM |
GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM, source_pad_blocked_cb,
gst_object_ref (dpad), (GDestroyNotify) gst_object_unref);
} else {
if (dpad->block_id != 0) {
gst_pad_remove_probe (opad, dpad->block_id);
dpad->block_id = 0;
}
dpad->blocked = FALSE;
}
}
if (blocked) {
if (dbin->shutdown) {
/* deactivate to force flushing state to prevent NOT_LINKED errors */
gst_pad_set_active (GST_PAD_CAST (dpad), FALSE);
/* note that deactivating the target pad would have no effect here,
* since elements are typically connected first (and pads exposed),
* and only then brought to PAUSED state (so pads activated) */
} else {
gst_object_ref (dpad);
dbin->blocked_pads = g_list_prepend (dbin->blocked_pads, dpad);
}
} else {
GList *l;
if ((l = g_list_find (dbin->blocked_pads, dpad))) {
gst_object_unref (dpad);
dbin->blocked_pads = g_list_delete_link (dbin->blocked_pads, l);
}
}
gst_object_unref (opad);
out:
DYN_UNLOCK (dbin);
}
static void
gst_decode_pad_add_drained_check (GstDecodePad * dpad)
{
gst_pad_add_probe (GST_PAD_CAST (dpad), GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
source_pad_event_probe, dpad, NULL);
}
static void
gst_decode_pad_activate (GstDecodePad * dpad, GstDecodeChain * chain)
{
g_return_if_fail (chain != NULL);
dpad->chain = chain;
gst_pad_set_active (GST_PAD_CAST (dpad), TRUE);
gst_decode_pad_set_blocked (dpad, TRUE);
gst_decode_pad_add_drained_check (dpad);
}
static void
gst_decode_pad_unblock (GstDecodePad * dpad)
{
gst_decode_pad_set_blocked (dpad, FALSE);
}
static gboolean
gst_decode_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstDecodePad *dpad = GST_DECODE_PAD (parent);
gboolean ret = FALSE;
CHAIN_MUTEX_LOCK (dpad->chain);
if (!dpad->exposed && !dpad->dbin->shutdown && !dpad->chain->deadend
&& dpad->chain->elements) {
GstDecodeElement *delem = dpad->chain->elements->data;
ret = FALSE;
GST_DEBUG_OBJECT (dpad->dbin,
"calling autoplug-query for %s (element %s): %" GST_PTR_FORMAT,
GST_PAD_NAME (dpad), GST_ELEMENT_NAME (delem->element), query);
g_signal_emit (G_OBJECT (dpad->dbin),
gst_decode_bin_signals[SIGNAL_AUTOPLUG_QUERY], 0, dpad, delem->element,
query, &ret);
if (ret)
GST_DEBUG_OBJECT (dpad->dbin,
"autoplug-query returned %d: %" GST_PTR_FORMAT, ret, query);
else
GST_DEBUG_OBJECT (dpad->dbin, "autoplug-query returned %d", ret);
}
CHAIN_MUTEX_UNLOCK (dpad->chain);
/* If exposed or nothing handled the query use the default handler */
if (!ret)
ret = gst_pad_query_default (pad, parent, query);
return ret;
}
/*gst_decode_pad_new:
*
* Creates a new GstDecodePad for the given pad.
*/
static GstDecodePad *
gst_decode_pad_new (GstDecodeBin * dbin, GstDecodeChain * chain)
{
GstDecodePad *dpad;
GstProxyPad *ppad;
GstPadTemplate *pad_tmpl;
GST_DEBUG_OBJECT (dbin, "making new decodepad");
pad_tmpl = gst_static_pad_template_get (&decoder_bin_src_template);
dpad =
g_object_new (GST_TYPE_DECODE_PAD, "direction", GST_PAD_SRC,
"template", pad_tmpl, NULL);
gst_ghost_pad_construct (GST_GHOST_PAD_CAST (dpad));
dpad->chain = chain;
dpad->dbin = dbin;
gst_object_unref (pad_tmpl);
ppad = gst_proxy_pad_get_internal (GST_PROXY_PAD (dpad));
gst_pad_set_query_function (GST_PAD_CAST (ppad), gst_decode_pad_query);
gst_object_unref (ppad);
return dpad;
}
static void
gst_pending_pad_free (GstPendingPad * ppad)
{
g_assert (ppad);
g_assert (ppad->pad);
if (ppad->event_probe_id != 0)
gst_pad_remove_probe (ppad->pad, ppad->event_probe_id);
if (ppad->notify_caps_id)
g_signal_handler_disconnect (ppad->pad, ppad->notify_caps_id);
gst_object_unref (ppad->pad);
g_slice_free (GstPendingPad, ppad);
}
/*****
* Element add/remove
*****/
static void
do_async_start (GstDecodeBin * dbin)
{
GstMessage *message;
dbin->async_pending = TRUE;
message = gst_message_new_async_start (GST_OBJECT_CAST (dbin));
parent_class->handle_message (GST_BIN_CAST (dbin), message);
}
static void
do_async_done (GstDecodeBin * dbin)
{
GstMessage *message;
if (dbin->async_pending) {
message =
gst_message_new_async_done (GST_OBJECT_CAST (dbin),
GST_CLOCK_TIME_NONE);
parent_class->handle_message (GST_BIN_CAST (dbin), message);
dbin->async_pending = FALSE;
}
}
/*****
* convenience functions
*****/
/* find_sink_pad
*
* Returns the first sink pad of the given element, or NULL if it doesn't have
* any.
*/
static GstPad *
find_sink_pad (GstElement * element)
{
GstIterator *it;
GstPad *pad = NULL;
GValue item = { 0, };
it = gst_element_iterate_sink_pads (element);
if ((gst_iterator_next (it, &item)) == GST_ITERATOR_OK)
pad = g_value_dup_object (&item);
g_value_unset (&item);
gst_iterator_free (it);
return pad;
}
/* call with dyn_lock held */
static void
unblock_pads (GstDecodeBin * dbin)
{
GList *tmp;
GST_LOG_OBJECT (dbin, "unblocking pads");
for (tmp = dbin->blocked_pads; tmp; tmp = tmp->next) {
GstDecodePad *dpad = (GstDecodePad *) tmp->data;
GstPad *opad;
opad = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (dpad));
if (!opad)
continue;
GST_DEBUG_OBJECT (dpad, "unblocking");
if (dpad->block_id != 0) {
gst_pad_remove_probe (opad, dpad->block_id);
dpad->block_id = 0;
}
dpad->blocked = FALSE;
/* make flushing, prevent NOT_LINKED */
GST_PAD_SET_FLUSHING (GST_PAD_CAST (dpad));
gst_object_unref (dpad);
gst_object_unref (opad);
GST_DEBUG_OBJECT (dpad, "unblocked");
}
/* clear, no more blocked pads */
g_list_free (dbin->blocked_pads);
dbin->blocked_pads = NULL;
}
static GstStateChangeReturn
gst_decode_bin_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstDecodeBin *dbin = GST_DECODE_BIN (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (dbin->typefind == NULL)
goto missing_typefind;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* Make sure we've cleared all existing chains */
EXPOSE_LOCK (dbin);
if (dbin->decode_chain) {
gst_decode_chain_free (dbin->decode_chain);
dbin->decode_chain = NULL;
}
EXPOSE_UNLOCK (dbin);
DYN_LOCK (dbin);
GST_LOG_OBJECT (dbin, "clearing shutdown flag");
dbin->shutdown = FALSE;
DYN_UNLOCK (dbin);
dbin->have_type = FALSE;
ret = GST_STATE_CHANGE_ASYNC;
do_async_start (dbin);
/* connect a signal to find out when the typefind element found
* a type */
dbin->have_type_id =
g_signal_connect (dbin->typefind, "have-type",
G_CALLBACK (type_found), dbin);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (dbin->have_type_id)
g_signal_handler_disconnect (dbin->typefind, dbin->have_type_id);
dbin->have_type_id = 0;
DYN_LOCK (dbin);
GST_LOG_OBJECT (dbin, "setting shutdown flag");
dbin->shutdown = TRUE;
unblock_pads (dbin);
DYN_UNLOCK (dbin);
default:
break;
}
{
GstStateChangeReturn bret;
bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (G_UNLIKELY (bret == GST_STATE_CHANGE_FAILURE))
goto activate_failed;
else if (G_UNLIKELY (bret == GST_STATE_CHANGE_NO_PREROLL)) {
do_async_done (dbin);
ret = bret;
}
}
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
do_async_done (dbin);
EXPOSE_LOCK (dbin);
if (dbin->decode_chain) {
gst_decode_chain_free (dbin->decode_chain);
dbin->decode_chain = NULL;
}
EXPOSE_UNLOCK (dbin);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
default:
break;
}
return ret;
/* ERRORS */
missing_typefind:
{
gst_element_post_message (element,
gst_missing_element_message_new (element, "typefind"));
GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), ("no typefind!"));
return GST_STATE_CHANGE_FAILURE;
}
activate_failed:
{
GST_DEBUG_OBJECT (element,
"element failed to change states -- activation problem?");
return GST_STATE_CHANGE_FAILURE;
}
}
static void
gst_decode_bin_handle_message (GstBin * bin, GstMessage * msg)
{
GstDecodeBin *dbin = GST_DECODE_BIN (bin);
gboolean drop = FALSE;
if (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_ERROR) {
GST_OBJECT_LOCK (dbin);
drop = (g_list_find (dbin->filtered, GST_MESSAGE_SRC (msg)) != NULL);
GST_OBJECT_UNLOCK (dbin);
}
if (drop)
gst_message_unref (msg);
else
GST_BIN_CLASS (parent_class)->handle_message (bin, msg);
}
gboolean
gst_decode_bin_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_decode_bin_debug, "decodebin", 0, "decoder bin");
/* Register some quarks here for the stream topology message */
topology_structure_name = g_quark_from_static_string ("stream-topology");
topology_caps = g_quark_from_static_string ("caps");
topology_next = g_quark_from_static_string ("next");
topology_pad = g_quark_from_static_string ("pad");
topology_element_srcpad = g_quark_from_static_string ("element-srcpad");
return gst_element_register (plugin, "decodebin", GST_RANK_NONE,
GST_TYPE_DECODE_BIN);
}
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