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gstreamer/gst/playback/gstdecodebin2.c
Mark Nauwelaerts 2482a536ac decodebin2: sprinkle some more locking 
... to avoid races and ensure some data structure consistency.

See also #574289.
2010-01-16 18:48:00 +01:00

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/* GStreamer
* Copyright (C) <2006> Edward Hervey <edward@fluendo.com>
* Copyright (C) <2009> 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-decodebin2
*
* #GstBin that auto-magically constructs a decoding pipeline using available
* decoders and demuxers via auto-plugging.
*
* At this stage, decodebin2 is considered UNSTABLE. The API provided in the
* signals is expected to change in the near future.
*
* To try out decodebin2, you can set the USE_DECODEBIN2 environment
* variable (USE_DECODEBIN2=1 for example). This will cause playbin to use
* decodebin2 instead of the older #GstDecodeBin for its internal auto-plugging.
*/
/* Implementation notes:
*
* The following section describes how decodebin2 works internally.
*
* The first part of decodebin2 is it's typefind element, which tries
* to get the type of the input stream. If the type is found autoplugging starts.
*
* decodebin2 internally organizes the elements it autoplugged into GstDecodeChains
* and GstDecodeGroups. A decode chain is a single chain of decoding, this
* means that if decodebin2 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 OTOH is complete if all child chains are complete.
*
* If this happens at some point, all endpads of all active groups are exposed.
* For this decodebin2 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 decodebin2 checks upwards
* via the parent pointers 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.
*
* 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!
*
*/
#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-marshal.h"
#include "gstplay-enum.h"
#include "gstfactorylists.h"
#include "gstrawcaps.h"
/* 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%d",
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 _GstDecodeChain GstDecodeChain;
typedef struct _GstDecodeGroup GstDecodeGroup;
typedef struct _GstDecodePad GstDecodePad;
typedef GstGhostPadClass GstDecodePadClass;
typedef struct _GstDecodeBin GstDecodeBin;
typedef struct _GstDecodeBin GstDecodeBin2;
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))
/**
* GstDecodeBin2:
*
* The opaque #DecodeBin2 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;
GstElement *typefind; /* this holds the typefind object */
GMutex *expose_lock; /* Protects exposal and removal of groups */
GstDecodeChain *decode_chain; /* Top level decode chain */
gint nbpads; /* unique identifier for source pads */
GMutex *factories_lock;
guint32 factories_cookie; /* Cookie from last time when factories was updated */
GValueArray *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 emited */
GMutex *dyn_lock; /* lock protecting pad blocking */
gboolean shutdown; /* if we are shutting down */
GList *blocked_pads; /* pads that have set to block */
};
struct _GstDecodeBinClass
{
GstBinClass parent_class;
/* signal we fire when a new pad has been decoded into raw audio/video */
void (*new_decoded_pad) (GstElement * element, GstPad * pad, gboolean last);
/* signal we fire when a pad has been removed */
void (*removed_decoded_pad) (GstElement * element, GstPad * pad);
/* 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);
/* fired when the last group is drained */
void (*drained) (GstElement * element);
};
/* signals */
enum
{
SIGNAL_NEW_DECODED_PAD,
SIGNAL_REMOVED_DECODED_PAD,
SIGNAL_UNKNOWN_TYPE,
SIGNAL_AUTOPLUG_CONTINUE,
SIGNAL_AUTOPLUG_FACTORIES,
SIGNAL_AUTOPLUG_SELECT,
SIGNAL_AUTOPLUG_SORT,
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_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
/* 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_LAST
};
static GstBinClass *parent_class;
static guint gst_decode_bin_signals[LAST_SIGNAL] = { 0 };
static const GstElementDetails gst_decode_bin_details =
GST_ELEMENT_DETAILS ("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>");
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);
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 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);
#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;
};
/* 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 demuxer; /* TRUE if elements->data is a demuxer */
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 *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 void gst_decode_chain_handle_eos (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_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_bin_expose (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 */
};
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, GstPad * pad,
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 void gst_pending_pad_free (GstPendingPad * ppad);
static gboolean pad_event_cb (GstPad * pad, GstEvent * event, 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, "GstDecodeBin2",
&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;
}
/* 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 void
gst_decode_bin_class_init (GstDecodeBinClass * klass)
{
GObjectClass *gobject_klass;
GstElementClass *gstelement_klass;
gobject_klass = (GObjectClass *) klass;
gstelement_klass = (GstElementClass *) 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;
/**
* GstDecodeBin2::new-decoded-pad:
* @bin: The decodebin
* @pad: The newly created pad
* @islast: #TRUE if this is the last pad to be added. Deprecated.
*
* This signal gets emitted as soon as a new pad of the same type as one of
* the valid 'raw' types is added.
*/
gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD] =
g_signal_new ("new-decoded-pad", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDecodeBinClass, new_decoded_pad), NULL, NULL,
gst_play_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2, GST_TYPE_PAD,
G_TYPE_BOOLEAN);
/**
* GstDecodeBin2::removed-decoded-pad:
* @bin: The decodebin
* @pad: The pad that was removed
*
* This signal is emitted when a 'final' caps pad has been removed.
*/
gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD] =
g_signal_new ("removed-decoded-pad", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDecodeBinClass, removed_decoded_pad), NULL, NULL,
gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
/**
* GstDecodeBin2::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, gst_marshal_VOID__OBJECT_BOXED, G_TYPE_NONE, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstDecodeBin2::autoplug-continue:
* @bin: The decodebin
* @pad: The #GstPad.
* @caps: The #GstCaps found.
*
* This signal is emitted whenever decodebin2 finds a new stream. It is
* emitted before looking for any elements that can handle that stream.
*
* Returns: #TRUE if you wish decodebin2 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 'new-decoded-pad'
* signal).
*/
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, gst_play_marshal_BOOLEAN__OBJECT_BOXED,
G_TYPE_BOOLEAN, 2, GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstDecodeBin2::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. Decodebin2 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.
*
* 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,
gst_play_marshal_BOXED__OBJECT_BOXED, G_TYPE_VALUE_ARRAY, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstDecodeBin2::autoplug-sort:
* @bin: The decodebin
* @pad: The #GstPad.
* @caps: The #GstCaps.
* @factories: A #GValueArray of possible #GstElementFactory to use.
*
* Once decodebin2 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.
*
* 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),
NULL, NULL, gst_play_marshal_BOXED__OBJECT_BOXED_BOXED,
G_TYPE_VALUE_ARRAY, 3, GST_TYPE_PAD, GST_TYPE_CAPS, G_TYPE_VALUE_ARRAY);
/**
* GstDecodeBin2::autoplug-select:
* @bin: The decodebin
* @pad: The #GstPad.
* @caps: The #GstCaps.
* @factory: A #GstElementFactory to use
*
* This signal is emitted once decodebin2 has found all the possible
* #GstElementFactory that can be used to handle the given @caps. For each of
* those factories, this signal is emited.
*
* The signal handler should return a #GST_TYPE_AUTOPLUG_SELECT_RESULT enum
* value indicating what decodebin2 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.
*
* 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,
gst_play_marshal_ENUM__OBJECT_BOXED_OBJECT,
GST_TYPE_AUTOPLUG_SELECT_RESULT, 3, GST_TYPE_PAD, GST_TYPE_CAPS,
GST_TYPE_ELEMENT_FACTORY);
/**
* GstDecodeBin2::drained
* @bin: The decodebin
*
* This signal is emitted once decodebin2 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, gst_marshal_VOID__VOID, 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));
/**
* GstDecodeBin2::use-buffering
*
* Activate buffering in decodebin2. 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));
/**
* GstDecodebin2: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));
/**
* GstDecodebin2: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));
/**
* GstDecodebin2:max-size-bytes
*
* Max amount 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));
/**
* GstDecodebin2:max-size-buffers
*
* Max amount 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));
/**
* GstDecodebin2:max-size-time
*
* Max amount 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));
/**
* GstDecodeBin2::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));
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);
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_details (gstelement_klass, &gst_decode_bin_details);
gstelement_klass->change_state =
GST_DEBUG_FUNCPTR (gst_decode_bin_change_state);
}
/* Must be called with factories lock! */
static void
gst_decode_bin_update_factories_list (GstDecodeBin * dbin)
{
if (!dbin->factories
|| dbin->factories_cookie !=
gst_default_registry_get_feature_list_cookie ()) {
if (dbin->factories)
g_value_array_free (dbin->factories);
dbin->factories = gst_factory_list_get_elements (GST_FACTORY_LIST_DECODER);
dbin->factories_cookie = gst_default_registry_get_feature_list_cookie ();
}
}
static void
gst_decode_bin_init (GstDecodeBin * decode_bin)
{
/* first filter out the interesting element factories */
decode_bin->factories_lock = g_mutex_new ();
gst_decode_bin_update_factories_list (decode_bin);
/* 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;
/* 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");
/* ghost the sink pad to ourself */
gpad = gst_ghost_pad_new ("sink", pad);
gst_pad_set_active (gpad, TRUE);
gst_element_add_pad (GST_ELEMENT (decode_bin), gpad);
gst_object_unref (pad);
/* connect a signal to find out when the typefind element found
* a type */
decode_bin->have_type_id =
g_signal_connect (G_OBJECT (decode_bin->typefind), "have-type",
G_CALLBACK (type_found), decode_bin);
}
decode_bin->expose_lock = g_mutex_new ();
decode_bin->decode_chain = NULL;
decode_bin->dyn_lock = g_mutex_new ();
decode_bin->shutdown = FALSE;
decode_bin->blocked_pads = NULL;
decode_bin->subtitle_lock = g_mutex_new ();
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;
}
static void
gst_decode_bin_dispose (GObject * object)
{
GstDecodeBin *decode_bin;
decode_bin = GST_DECODE_BIN (object);
if (decode_bin->factories)
g_value_array_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);
if (decode_bin->expose_lock) {
g_mutex_free (decode_bin->expose_lock);
decode_bin->expose_lock = NULL;
}
if (decode_bin->dyn_lock) {
g_mutex_free (decode_bin->dyn_lock);
decode_bin->dyn_lock = NULL;
}
if (decode_bin->subtitle_lock) {
g_mutex_free (decode_bin->subtitle_lock);
decode_bin->subtitle_lock = NULL;
}
if (decode_bin->factories_lock) {
g_mutex_free (decode_bin->factories_lock);
decode_bin->factories_lock = NULL;
}
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;
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;
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)
{
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);
result = gst_factory_list_filter (dbin->factories, caps);
g_mutex_unlock (dbin->factories_lock);
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)
{
GValueArray *result;
result = g_value_array_copy (factories);
GST_DEBUG_OBJECT (element, "autoplug-sort returns %p", result);
/* return input */
return result;
}
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;
}
/********
* Discovery methods
*****/
static gboolean are_raw_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, GstElement * element,
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;
GST_DEBUG_OBJECT (dbin, "Pad %s:%s caps:%" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), caps);
if (chain->elements && src != chain->elements->data) {
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;
CHAIN_MUTEX_LOCK (oldchain);
group = gst_decode_chain_get_current_group (chain);
if (group) {
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;
dpad = gst_decode_pad_new (dbin, pad, chain);
/* 1. Emit 'autoplug-continue' the result will tell us if this pads needs
* further autoplugging. */
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE], 0, dpad, caps,
&apcontinue);
/* 1.a if autoplug-continue is FALSE or caps is a raw format, goto pad_is_final */
if ((!apcontinue) || are_raw_caps (dbin, caps))
goto expose_pad;
/* 1.b 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 (!gst_caps_is_fixed (caps))
goto non_fixed;
/* 1.c 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 an unknown type */
if (factories->n_values == 0) {
/* no compatible factories */
g_value_array_free (factories);
gst_object_unref (dpad);
goto unknown_type;
}
/* 1.d sort some more. */
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT], 0, dpad, caps, factories,
&result);
g_value_array_free (factories);
factories = result;
/* 1.e else continue autoplugging something from the list. */
GST_LOG_OBJECT (pad, "Let's continue discovery on this pad");
connect_pad (dbin, src, dpad, pad, caps, factories, chain);
gst_object_unref (dpad);
g_value_array_free (factories);
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;
}
unknown_type:
{
GST_LOG_OBJECT (pad, "Unknown type, firing signal");
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE], 0, pad, caps);
chain->deadend = TRUE;
chain->endcaps = gst_caps_ref (caps);
gst_element_post_message (GST_ELEMENT_CAST (dbin),
gst_missing_decoder_message_new (GST_ELEMENT_CAST (dbin), 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);
do_async_done (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));
}
}
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_WARNING_OBJECT (pad,
"pad has ANY caps, not able to autoplug to anything");
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_event_probe (pad, (GCallback) pad_event_cb, ppad);
chain->pending_pads = g_list_prepend (chain->pending_pads, ppad);
CHAIN_MUTEX_UNLOCK (chain);
g_signal_connect (G_OBJECT (pad), "notify::caps",
G_CALLBACK (caps_notify_cb), chain);
return;
}
}
/* 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",
GST_DEBUG_PAD_NAME (pad), chain);
/* 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;
GstElement *element;
GstPad *sinkpad;
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);
/* 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;
}
/* ... activate it ... We do this before adding it to the bin so that we
* don't accidentally make it post error messages that will stop
* everything. */
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));
gst_object_unref (element);
continue;
}
/* 2.3. Find its sink pad, this should work after activating it. */
if (!(sinkpad = find_sink_pad (element))) {
GST_WARNING_OBJECT (dbin, "Element %s doesn't have a sink pad",
GST_ELEMENT_NAME (element));
gst_element_set_state (element, GST_STATE_NULL);
gst_object_unref (element);
continue;
}
/* 2.4 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));
gst_object_unref (sinkpad);
gst_element_set_state (element, GST_STATE_NULL);
gst_object_unref (element);
continue;
}
/* 2.5 ...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));
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);
chain->elements =
g_list_prepend (chain->elements, gst_object_ref (element));
chain->demuxer = is_demuxer_element (element);
CHAIN_MUTEX_UNLOCK (chain);
/* link this element further */
connect_element (dbin, element, chain);
/* try to configure the subtitle encoding property when we can */
if (g_object_class_find_property (G_OBJECT_GET_CLASS (element),
"subtitle-encoding")) {
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) {
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 {
tmp = chain->elements->data;
gst_element_set_state (tmp, GST_STATE_NULL);
gst_bin_remove (GST_BIN (dbin), tmp);
chain->elements = g_list_delete_link (chain->elements, chain->elements);
} while (tmp != element);
CHAIN_MUTEX_UNLOCK (chain);
continue;
}
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 gboolean
connect_element (GstDecodeBin * dbin, GstElement * element,
GstDecodeChain * chain)
{
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);
g_signal_connect (G_OBJECT (element), "pad-added",
G_CALLBACK (pad_added_cb), chain);
g_signal_connect (G_OBJECT (element), "pad-removed",
G_CALLBACK (pad_removed_cb), chain);
g_signal_connect (G_OBJECT (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 = gst_pad_get_caps_reffed (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;
}
static void
type_found (GstElement * typefind, guint probability,
GstCaps * caps, GstDecodeBin * decode_bin)
{
GstPad *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")),
("decodebin2 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");
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_object_unref (pad);
exit:
return;
}
static gboolean
pad_event_cb (GstPad * pad, GstEvent * event, gpointer data)
{
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;
/* 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 TRUE;
}
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 = gst_pad_get_caps_reffed (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) {
g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain);
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 || (GstElement *) chain->elements->data != 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) {
group = chain->next_groups->data;
}
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);
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 */
g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain);
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_klass (srcfactory);
/* 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 raw, or if they are compatible with the caps
* specified in the 'caps' property
*
* The decodebin_lock should be taken !
*/
static gboolean
are_raw_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_can_intersect (dbin->caps, caps);
GST_OBJECT_UNLOCK (dbin);
GST_LOG_OBJECT (dbin, "Caps are %sfinal caps", res ? "" : "not ");
return res;
}
/****
* GstDecodeChain functions
****/
/* 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 if (chain->next_groups && (group = chain->next_groups->data)
&& !group->overrun && !group->no_more_pads) {
/* group = chain->next_groups->data */
} else {
group = gst_decode_group_new (chain->dbin, chain);
chain->next_groups = g_list_prepend (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;
GstPad *pad = ppad->pad;
g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain);
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) {
GstElement *element = GST_ELEMENT (l->data);
g_signal_handlers_disconnect_by_func (element, pad_added_cb, chain);
g_signal_handlers_disconnect_by_func (element, pad_removed_cb, chain);
g_signal_handlers_disconnect_by_func (element, no_more_pads_cb, chain);
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) {
gst_object_unref (element);
l->data = NULL;
}
}
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));
chain->endpad->exposed = FALSE;
if (!hide) {
gst_object_unref (chain->endpad);
chain->endpad = 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_free (chain->lock);
g_slice_free (GstDecodeChain, chain);
}
}
/* gst_decode_chain_free:
*
* Completely frees and removes the chain and all
* child groups from decodebin2.
*
* 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;
chain->lock = g_mutex_new ();
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;
/* 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 decodebin2
* 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)
{
guint max_bytes, max_buffers;
guint64 max_time;
if (preroll || dbin->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 = AUTO_PREROLL_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 ((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;
if ((max_time = dbin->max_size_time) == 0)
max_time = AUTO_PLAY_SIZE_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;
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;
g_object_set (mq, "use-buffering", dbin->use_buffering, NULL);
if (dbin->use_buffering) {
g_object_set (mq, "low-percent", dbin->low_percent, NULL);
g_object_set (mq, "high-percent", dbin->high_percent, NULL);
}
/* configure queue sizes for preroll */
decodebin_set_queue_size (dbin, mq, TRUE);
group->overrunsig = g_signal_connect (G_OBJECT (mq), "overrun",
G_CALLBACK (multi_queue_overrun_cb), group);
gst_bin_add (GST_BIN (dbin), gst_object_ref (mq));
gst_element_set_state (mq, GST_STATE_PAUSED);
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;
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%d"))) {
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, (gpointer) & srcpad)) != GST_ITERATOR_OK
|| srcpad == 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 (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->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;
}
/* check if the group is drained, meaning all pads have seen an EOS
* event. */
static void
gst_decode_pad_handle_eos (GstDecodePad * pad)
{
GstDecodeChain *chain = pad->chain;
GST_LOG_OBJECT (pad->dbin, "chain : %p, pad %p", chain, pad);
pad->drained = TRUE;
gst_decode_chain_handle_eos (chain);
}
/* gst_decode_chain_handle_eos:
*
* Checks if there are next groups in any parent chain
* to which we can switch or if everything is drained.
*
* If there are groups to switch to, hide the current active
* one and expose the new one.
*
* MT-safe, don't call with chain lock!
*/
static void
gst_decode_chain_handle_eos (GstDecodeChain * eos_chain)
{
GstDecodeBin *dbin = eos_chain->dbin;
GstDecodeGroup *group = eos_chain->parent;
GstDecodeChain *chain = eos_chain;
gboolean drained;
g_return_if_fail (eos_chain->endpad);
CHAIN_MUTEX_LOCK (chain);
while ((group = chain->parent)) {
CHAIN_MUTEX_UNLOCK (chain);
chain = group->parent;
CHAIN_MUTEX_LOCK (chain);
if (gst_decode_group_is_drained (group)) {
continue;
}
break;
}
drained = chain->active_group ?
gst_decode_group_is_drained (chain->active_group) : TRUE;
/* Now either group == NULL and chain == dbin->decode_chain
* or chain is the lowest chain that has a non-drained group */
if (chain->active_group && drained && chain->next_groups) {
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);
CHAIN_MUTEX_UNLOCK (chain);
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain))
gst_decode_bin_expose (dbin);
EXPOSE_UNLOCK (dbin);
} else if (!chain->active_group || drained) {
g_assert (chain == dbin->decode_chain);
CHAIN_MUTEX_UNLOCK (chain);
GST_LOG_OBJECT (dbin, "all groups drained, fire signal");
g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_DRAINED], 0,
NULL);
} else {
CHAIN_MUTEX_UNLOCK (chain);
GST_DEBUG_OBJECT (dbin,
"Current active group in chain %p is not drained yet", chain);
}
}
/* 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;
}
/* 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;
capsa = gst_pad_get_caps_reffed (GST_PAD_CAST (da));
capsb = gst_pad_get_caps_reffed (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);
return va - vb;
}
static GstCaps *
_gst_element_get_linked_caps (GstElement * src, GstElement * sink)
{
GstIterator *it;
GstElement *parent;
GstPad *pad, *peer;
gboolean done = FALSE;
GstCaps *caps = NULL;
it = gst_element_iterate_src_pads (src);
while (!done) {
switch (gst_iterator_next (it, (gpointer) & pad)) {
case GST_ITERATOR_OK:
peer = gst_pad_get_peer (pad);
if (peer) {
parent = gst_pad_get_parent_element (peer);
if (parent == sink) {
caps = gst_pad_get_negotiated_caps (pad);
done = TRUE;
}
if (parent)
gst_object_unref (parent);
gst_object_unref (peer);
}
gst_object_unref (pad);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (it);
break;
case GST_ITERATOR_ERROR:
case GST_ITERATOR_DONE:
done = TRUE;
break;
}
}
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;
/* 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;
u = gst_structure_id_empty_new (topology_structure_name);
/* Now at the last element */
if (chain->elements && (chain->endpad || chain->deadend)) {
s = gst_structure_id_empty_new (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 (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);
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->next : NULL;
for (; l && l->next; l = l->next) {
GstCaps *caps = _gst_element_get_linked_caps (l->next->data, l->data);
s = gst_structure_id_empty_new (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;
}
/* Caps that resulted in this chain */
caps = gst_pad_get_negotiated_caps (chain->pad);
if (!caps) {
caps = gst_pad_get_caps_reffed (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_set (u, "caps", GST_TYPE_CAPS, caps, 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);
}
/* 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;
}
/* 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%d", 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);
/* 2. activate and add */
if (!dpad->exposed
&& !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 decodebin2");
continue;
}
dpad->exposed = TRUE;
/* 3. emit signal */
GST_DEBUG_OBJECT (dbin, "emitting new-decoded-pad");
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD], 0, dpad,
(tmp->next == NULL));
GST_DEBUG_OBJECT (dbin, "emitted new-decoded-pad");
}
/* 4. Signal no-more-pads. This allows the application to hook stuff to the
* exposed pads */
GST_LOG_OBJECT (dbin, "signalling 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);
/* 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 (pad);
gst_object_sink (pad);
}
static void
source_pad_blocked_cb (GstPad * pad, gboolean blocked, GstDecodePad * dpad)
{
GstDecodeChain *chain;
GstDecodeBin *dbin;
chain = dpad->chain;
dbin = chain->dbin;
GST_LOG_OBJECT (dpad, "blocked:%d, dpad->chain:%p", blocked, chain);
dpad->blocked = blocked;
if (dpad->blocked) {
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);
}
}
static gboolean
source_pad_event_probe (GstPad * pad, GstEvent * event, GstDecodePad * dpad)
{
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 a next group to expose, we
* will remove the ghostpad of the current group first, which unlinks the
* peer and so drops the EOS. */
gst_decode_pad_handle_eos (dpad);
}
/* never drop events */
return TRUE;
}
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)
gst_pad_set_blocked_async_full (opad, blocked,
(GstPadBlockCallback) source_pad_blocked_cb, gst_object_ref (dpad),
(GDestroyNotify) gst_object_unref);
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_event_probe (GST_PAD_CAST (dpad),
G_CALLBACK (source_pad_event_probe), dpad);
}
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);
}
/*gst_decode_pad_new:
*
* Creates a new GstDecodePad for the given pad.
*/
static GstDecodePad *
gst_decode_pad_new (GstDecodeBin * dbin, GstPad * pad, GstDecodeChain * chain)
{
GstDecodePad *dpad;
GST_DEBUG_OBJECT (dbin, "making new decodepad");
dpad =
g_object_new (GST_TYPE_DECODE_PAD, "direction", GST_PAD_DIRECTION (pad),
NULL);
gst_ghost_pad_construct (GST_GHOST_PAD_CAST (dpad));
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (dpad), pad);
dpad->chain = chain;
dpad->dbin = dbin;
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_event_probe (ppad->pad, ppad->event_probe_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), FALSE);
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));
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;
gpointer point;
it = gst_element_iterate_sink_pads (element);
if ((gst_iterator_next (it, &point)) == GST_ITERATOR_OK)
pad = (GstPad *) point;
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");
gst_pad_set_blocked_async_full (opad, FALSE,
(GstPadBlockCallback) source_pad_blocked_cb, gst_object_ref (dpad),
(GDestroyNotify) gst_object_unref);
/* 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;
g_mutex_lock (dbin->factories_lock);
gst_decode_bin_update_factories_list (dbin);
g_mutex_unlock (dbin->factories_lock);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
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);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
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);
if (dbin->decode_chain) {
gst_decode_chain_free (dbin->decode_chain);
dbin->decode_chain = NULL;
}
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;
}
}
gboolean
gst_decode_bin_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_decode_bin_debug, "decodebin2", 0,
"decoder bin");
#ifdef ENABLE_NLS
GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
LOCALEDIR);
bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
#endif /* ENABLE_NLS */
/* 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");
return gst_element_register (plugin, "decodebin2", GST_RANK_NONE,
GST_TYPE_DECODE_BIN);
}
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