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gstreamer/gst/playback/gstdecodebin2.c
Sebastian Dröge 1da5a3f7d3 playback: Update factories list on every access if the registry has changed 
This makes application's simpler because the element doesn't need to
go to NULL first to make use of newly installed plugins.

Fixes bug #601480.
2009-11-11 14:00:26 +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 _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 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
/* 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
*/
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);
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);
/********************************
* 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:
{
/* 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));
chain->pending_pads =
g_list_prepend (chain->pending_pads, gst_object_ref (pad));
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 (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 (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 (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 (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 (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 (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 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) {
GstPad *opad = l->data;
if (pad == opad) {
g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain);
gst_object_unref (pad);
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");
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));
return;
} else if (!chain->demuxer) {
GST_LOG_OBJECT (chain->dbin, "no-more-pads from a non-demuxer element '%s'",
GST_OBJECT_NAME (element));
return;
}
CHAIN_MUTEX_LOCK (chain);
/* 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;
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) {
if (l->data == pad) {
gst_object_unref (GST_OBJECT_CAST (l->data));
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) {
GstPad *pad = GST_PAD (l->data);
g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain);
gst_object_unref (pad);
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 ? "Hided" : "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;
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:
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 (da));
capsb = gst_pad_get_caps_reffed (GST_PAD (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 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)) {
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) {
GST_WARNING_OBJECT (dbin, "No suitable plugins found");
GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL),
("no suitable plugins found"));
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_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 (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)
{
GstDecodeGroup *group;
GList *l;
GstDecodeBin *dbin;
if (chain->deadend)
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))
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);
opad = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (dpad));
if (!opad)
goto out;
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 (dpad), FALSE);
} 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 (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 (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;
dpad =
g_object_new (GST_TYPE_DECODE_PAD, "direction", GST_PAD_DIRECTION (pad),
NULL);
gst_ghost_pad_construct (GST_GHOST_PAD (dpad));
gst_ghost_pad_set_target (GST_GHOST_PAD (dpad), pad);
dpad->chain = chain;
dpad->dbin = dbin;
return dpad;
}
/*****
* 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;
for (tmp = dbin->blocked_pads; tmp; tmp = tmp->next) {
GstDecodePad *dpad = (GstDecodePad *) tmp->data;
GstPad *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 (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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