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gstreamer/gst/playback/gstdecodebin2.c
Wim Taymans 74e5172181 gst/playback/gstdecodebin2.c: Expose the right pad in the right place with the right element. 
Original commit message from CVS:
* gst/playback/gstdecodebin2.c: (analyze_new_pad), (connect_pad):
Expose the right pad in the right place with the right element.
2007-12-13 12:31:38 +00:00

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/* GStreamer
* Copyright (C) <2006> Edward Hervey <edward@fluendo.com>
*
* 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
* @short_description: Next-generation automatic decoding bin
*
* #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 decodebin for its internal auto-plugging.
*/
#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"
/* 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 _GstDecodeGroup GstDecodeGroup;
typedef struct _GstDecodePad GstDecodePad;
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 */
GstElement *typefind; /* this holds the typefind object */
GstElement *fakesink;
GMutex *lock; /* Protects activegroup and groups */
GstDecodeGroup *activegroup; /* group currently active */
GList *groups; /* List of non-active GstDecodeGroups, sorted in
* order of creation. */
GList *oldgroups; /* List of no-longer-used GstDecodeGroups.
* Should be freed in dispose */
gint nbpads; /* unique identifier for source pads */
GValueArray *factories; /* factories we can use for selecting elements */
gboolean have_type; /* if we received the have_type signal */
guint have_type_id; /* signal id for have-type from typefind */
};
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
};
/* Properties */
enum
{
PROP_0,
PROP_CAPS,
PROP_SUBTITLE_ENCODING
};
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@fluendo.com>");
static gboolean add_fakesink (GstDecodeBin * decode_bin);
static void remove_fakesink (GstDecodeBin * decode_bin);
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_group_cb (GstPad * pad, GParamSpec * unused,
GstDecodeGroup * group);
static void caps_notify_cb (GstPad * pad, GParamSpec * unused,
GstDecodeBin * dbin);
static GstPad *find_sink_pad (GstElement * element);
static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element,
GstStateChange transition);
#define DECODE_BIN_LOCK(dbin) G_STMT_START { \
GST_LOG_OBJECT (dbin, \
"locking from thread %p", \
g_thread_self ()); \
g_mutex_lock (GST_DECODE_BIN_CAST(dbin)->lock); \
GST_LOG_OBJECT (dbin, \
"locked from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define DECODE_BIN_UNLOCK(dbin) G_STMT_START { \
GST_LOG_OBJECT (dbin, \
"unlocking from thread %p", \
g_thread_self ()); \
g_mutex_unlock (GST_DECODE_BIN_CAST(dbin)->lock); \
} G_STMT_END
/* GstDecodeGroup
*
* Streams belonging to the same group/chain of a media file
*
*/
struct _GstDecodeGroup
{
GstDecodeBin *dbin;
GMutex *lock;
GstElement *multiqueue;
gboolean exposed; /* TRUE if this group is exposed */
gboolean drained; /* TRUE if EOS went throug all endpads */
gboolean blocked; /* TRUE if all endpads are blocked */
gboolean complete; /* TRUE if we are not expecting anymore streams
* on this group */
gulong overrunsig;
gulong underrunsig;
guint nbdynamic; /* number of dynamic pads in the group. */
GList *endpads; /* List of GstDecodePad of source pads to be exposed */
GList *ghosts; /* List of GstGhostPad for the endpads */
GList *reqpads; /* List of RequestPads for multiqueue. */
};
#define GROUP_MUTEX_LOCK(group) G_STMT_START { \
GST_LOG_OBJECT (group->dbin, \
"locking group %p from thread %p", \
group, g_thread_self ()); \
g_mutex_lock (group->lock); \
GST_LOG_OBJECT (group->dbin, \
"locked group %p from thread %p", \
group, g_thread_self ()); \
} G_STMT_END
#define GROUP_MUTEX_UNLOCK(group) G_STMT_START { \
GST_LOG_OBJECT (group->dbin, \
"unlocking group %p from thread %p", \
group, g_thread_self ()); \
g_mutex_unlock (group->lock); \
} G_STMT_END
static GstDecodeGroup *gst_decode_group_new (GstDecodeBin * decode_bin,
gboolean use_queue);
static GstPad *gst_decode_group_control_demuxer_pad (GstDecodeGroup * group,
GstPad * pad);
static gboolean gst_decode_group_control_source_pad (GstDecodeGroup * group,
GstPad * pad);
static gboolean gst_decode_group_expose (GstDecodeGroup * group);
static void gst_decode_group_check_if_blocked (GstDecodeGroup * group);
static void gst_decode_group_set_complete (GstDecodeGroup * group);
static void gst_decode_group_hide (GstDecodeGroup * group);
static void gst_decode_group_free (GstDecodeGroup * group);
/* GstDecodePad
*
* GstPad private used for source pads of groups
*/
struct _GstDecodePad
{
GstPad *pad;
GstDecodeGroup *group;
gboolean blocked;
gboolean drained;
};
static GstDecodePad *gst_decode_pad_new (GstDecodeGroup * group, GstPad * pad,
gboolean block);
static void source_pad_blocked_cb (GstPad * pad, gboolean blocked,
GstDecodePad * dpad);
/* TempPadStruct
* Internal structure used for pads which have more than one structure.
*/
typedef struct _TempPadStruct
{
GstDecodeBin *dbin;
GstDecodeGroup *group;
} TempPadStruct;
/********************************
* 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;
GstBinClass *gstbin_klass;
gobject_klass = (GObjectClass *) klass;
gstelement_klass = (GstElementClass *) klass;
gstbin_klass = (GstBinClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_klass->dispose = GST_DEBUG_FUNCPTR (gst_decode_bin_dispose);
gobject_klass->finalize = GST_DEBUG_FUNCPTR (gst_decode_bin_finalize);
gobject_klass->set_property = GST_DEBUG_FUNCPTR (gst_decode_bin_set_property);
gobject_klass->get_property = GST_DEBUG_FUNCPTR (gst_decode_bin_get_property);
/**
* GstDecodeBin2::new-decoded-pad:
* @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:
* @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:
* @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_OBJECT, G_TYPE_NONE, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstDecodeBin2::autoplug-continue:
* @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_OBJECT,
G_TYPE_BOOLEAN, 2, GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstDecodeBin2::autoplug-factories:
* @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_OBJECT, G_TYPE_VALUE_ARRAY, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstDecodeBin2::autoplug-sort:
* @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_OBJECT_BOXED,
G_TYPE_VALUE_ARRAY, 3, GST_TYPE_PAD, GST_TYPE_CAPS, G_TYPE_VALUE_ARRAY);
/**
* GstDecodeBin2::autoplug-select:
* @pad: The #GstPad.
* @caps: The #GstCaps.
* @factories: A #GValueArray of possible #GstElementFactory to use, sorted by
* rank (higher ranks come first).
*
* This signal is emitted once decodebin2 has found all the possible
* #GstElementFactory that can be used to handle the given @caps.
*
* Returns: A #gint indicating what factory index from the @factories array
* that you wish decodebin2 to use for trying to decode the given @caps.
* Return -1 to stop selection of a factory and expose the pad as a raw type.
* The default handler always returns the first possible factory (index 0).
*/
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_OBJECT_OBJECT,
GST_TYPE_AUTOPLUG_SELECT_RESULT, 3, GST_TYPE_PAD, GST_TYPE_CAPS,
GST_TYPE_ELEMENT_FACTORY);
/**
* GstDecodeBin2::drained
*
* 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_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));
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);
}
static void
gst_decode_bin_init (GstDecodeBin * decode_bin)
{
/* first filter out the interesting element factories */
decode_bin->factories =
gst_factory_list_get_elements (GST_FACTORY_LIST_DECODER);
/* 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_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->lock = g_mutex_new ();
decode_bin->activegroup = NULL;
decode_bin->groups = NULL;
decode_bin->caps =
gst_caps_from_string ("video/x-raw-yuv;video/x-raw-rgb;video/x-raw-gray;"
"audio/x-raw-int;audio/x-raw-float;" "text/plain;text/x-pango-markup");
add_fakesink (decode_bin);
/* FILLME */
}
static void
gst_decode_bin_dispose (GObject * object)
{
GstDecodeBin *decode_bin;
GList *tmp;
decode_bin = GST_DECODE_BIN (object);
if (decode_bin->factories)
g_value_array_free (decode_bin->factories);
decode_bin->factories = NULL;
if (decode_bin->activegroup) {
gst_decode_group_free (decode_bin->activegroup);
decode_bin->activegroup = NULL;
}
/* remove groups */
for (tmp = decode_bin->groups; tmp; tmp = g_list_next (tmp)) {
GstDecodeGroup *group = (GstDecodeGroup *) tmp->data;
gst_decode_group_free (group);
}
g_list_free (decode_bin->groups);
decode_bin->groups = NULL;
for (tmp = decode_bin->oldgroups; tmp; tmp = g_list_next (tmp)) {
GstDecodeGroup *group = (GstDecodeGroup *) tmp->data;
gst_decode_group_free (group);
}
g_list_free (decode_bin->oldgroups);
decode_bin->oldgroups = NULL;
if (decode_bin->caps)
gst_caps_unref (decode_bin->caps);
decode_bin->caps = NULL;
g_free (decode_bin->encoding);
decode_bin->encoding = NULL;
remove_fakesink (decode_bin);
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->lock) {
g_mutex_free (decode_bin->lock);
decode_bin->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);
DECODE_BIN_LOCK (dbin);
if (dbin->caps)
gst_caps_unref (dbin->caps);
if (caps)
gst_caps_ref (caps);
dbin->caps = caps;
DECODE_BIN_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");
DECODE_BIN_LOCK (dbin);
caps = dbin->caps;
if (caps)
gst_caps_ref (caps);
DECODE_BIN_UNLOCK (dbin);
return caps;
}
static void
gst_decode_bin_set_subs_encoding (GstDecodeBin * dbin, const gchar * encoding)
{
GST_DEBUG_OBJECT (dbin, "Setting new encoding: %s", GST_STR_NULL (encoding));
DECODE_BIN_LOCK (dbin);
g_free (dbin->encoding);
dbin->encoding = g_strdup (encoding);
DECODE_BIN_UNLOCK (dbin);
}
static gchar *
gst_decode_bin_get_subs_encoding (GstDecodeBin * dbin)
{
gchar *encoding;
GST_DEBUG_OBJECT (dbin, "Getting currently set encoding");
DECODE_BIN_LOCK (dbin);
encoding = g_strdup (dbin->encoding);
DECODE_BIN_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;
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;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GValueArray *find_compatibles (GstDecodeBin * decode_bin,
GstPad * pad, const GstCaps * caps);
/*****
* 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;
/* return all compatible factories for caps */
result = find_compatibles (GST_DECODE_BIN (element), pad, caps);
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,
GstPad * pad, GstCaps * caps, GValueArray * factories,
GstDecodeGroup * group);
static gboolean connect_element (GstDecodeBin * dbin, GstElement * element,
GstDecodeGroup * group);
static void expose_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad,
GstDecodeGroup * group);
static void pad_added_group_cb (GstElement * element, GstPad * pad,
GstDecodeGroup * group);
static void pad_removed_group_cb (GstElement * element, GstPad * pad,
GstDecodeGroup * group);
static void no_more_pads_group_cb (GstElement * element,
GstDecodeGroup * group);
static void pad_added_cb (GstElement * element, GstPad * pad,
GstDecodeBin * dbin);
static void pad_removed_cb (GstElement * element, GstPad * pad,
GstDecodeBin * dbin);
static void no_more_pads_cb (GstElement * element, GstDecodeBin * dbin);
static GstDecodeGroup *get_current_group (GstDecodeBin * dbin);
/* 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, GstDecodeGroup * group)
{
gboolean apcontinue = TRUE;
GValueArray *factories = NULL, *result = NULL;
GST_DEBUG_OBJECT (dbin, "Pad %s:%s caps:%" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), caps);
if ((caps == NULL) || gst_caps_is_empty (caps))
goto unknown_type;
if (gst_caps_is_any (caps))
goto any_caps;
/* 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, pad, 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, pad, 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);
goto unknown_type;
}
/* 1.d sort some more. */
g_signal_emit (G_OBJECT (dbin),
gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT], 0, pad, 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, pad, caps, factories, group);
g_value_array_free (factories);
return;
expose_pad:
{
GST_LOG_OBJECT (dbin, "Pad is final. autoplug-continue:%d", apcontinue);
expose_pad (dbin, src, pad, group);
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);
/* Check if there are no pending groups, if so, remove fakesink */
if (dbin->groups == NULL)
remove_fakesink (dbin);
if (src == dbin->typefind) {
gchar *desc;
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);
}
gst_element_post_message (GST_ELEMENT_CAST (dbin),
gst_missing_decoder_message_new (GST_ELEMENT_CAST (dbin), caps));
return;
}
non_fixed:
{
GST_DEBUG_OBJECT (pad, "pad has non-fixed caps delay autoplugging");
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 */
if (group) {
GROUP_MUTEX_LOCK (group);
group->nbdynamic++;
GST_LOG ("Group %p has now %d dynamic elements", group, group->nbdynamic);
GROUP_MUTEX_UNLOCK (group);
g_signal_connect (G_OBJECT (pad), "notify::caps",
G_CALLBACK (caps_notify_group_cb), group);
} else
g_signal_connect (G_OBJECT (pad), "notify::caps",
G_CALLBACK (caps_notify_cb), dbin);
return;
}
}
/* connect_pad:
*
* Try to connect the given pad to an element created from one of the factories,
* and recursively.
*
* Returns TRUE if an element was properly created and linked
*/
static gboolean
connect_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad,
GstCaps * caps, GValueArray * factories, GstDecodeGroup * group)
{
gboolean res = FALSE;
GstPad *mqpad = NULL;
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 , group:%p",
GST_DEBUG_PAD_NAME (pad), group);
/* 1. is element demuxer or parser */
if (is_demuxer_element (src)) {
GST_LOG_OBJECT (src, "is a demuxer, connecting the pad through multiqueue");
if (!group)
if (!(group = get_current_group (dbin))) {
group = gst_decode_group_new (dbin, TRUE);
DECODE_BIN_LOCK (dbin);
dbin->groups = g_list_append (dbin->groups, group);
DECODE_BIN_UNLOCK (dbin);
}
if (!(mqpad = gst_decode_group_control_demuxer_pad (group, pad)))
goto beach;
src = group->multiqueue;
pad = mqpad;
}
/* 2. Try to create an element and link to it */
while (factories->n_values > 0) {
GstAutoplugSelectResult ret;
GstElementFactory *factory;
GstElement *element;
GstPad *sinkpad;
/* 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, pad, 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, pad, group);
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;
}
/* 2.1. 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_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_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));
/* link this element further */
connect_element (dbin, element, group);
/* Bring the element to the state of the parent */
if ((gst_element_set_state (element,
GST_STATE_PAUSED)) == GST_STATE_CHANGE_FAILURE) {
GST_WARNING_OBJECT (dbin, "Couldn't set %s to PAUSED",
GST_ELEMENT_NAME (element));
gst_element_set_state (element, GST_STATE_NULL);
gst_bin_remove (GST_BIN (dbin), element);
continue;
}
res = TRUE;
break;
}
beach:
if (mqpad)
gst_object_unref (mqpad);
return res;
}
static gboolean
connect_element (GstDecodeBin * dbin, GstElement * element,
GstDecodeGroup * group)
{
GList *pads;
gboolean res = TRUE;
gboolean dynamic = FALSE;
GList *to_connect = NULL;
GST_DEBUG_OBJECT (dbin, "Attempting to connect element %s [group:%p] further",
GST_ELEMENT_NAME (element), group);
/* 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_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_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 relevent signals */
if (dynamic) {
if (group) {
GST_LOG ("Adding signals to element %s in group %p",
GST_ELEMENT_NAME (element), group);
GROUP_MUTEX_LOCK (group);
group->nbdynamic++;
GST_LOG ("Group %p has now %d dynamic elements", group, group->nbdynamic);
GROUP_MUTEX_UNLOCK (group);
g_signal_connect (G_OBJECT (element), "pad-added",
G_CALLBACK (pad_added_group_cb), group);
g_signal_connect (G_OBJECT (element), "pad-removed",
G_CALLBACK (pad_removed_group_cb), group);
g_signal_connect (G_OBJECT (element), "no-more-pads",
G_CALLBACK (no_more_pads_group_cb), group);
} else {
/* This is a non-grouped element, the handlers are different */
g_signal_connect (G_OBJECT (element), "pad-added",
G_CALLBACK (pad_added_cb), dbin);
g_signal_connect (G_OBJECT (element), "pad-removed",
G_CALLBACK (pad_removed_cb), dbin);
g_signal_connect (G_OBJECT (element), "no-more-pads",
G_CALLBACK (no_more_pads_cb), dbin);
}
}
/* 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 (pad);
analyze_new_pad (dbin, element, pad, caps, group);
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 group as a decoded pad.
* If group is NULL, a GstDecodeGroup will be created and setup properly.
*/
static void
expose_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad,
GstDecodeGroup * group)
{
gboolean newgroup = FALSE;
gboolean isdemux;
GstPad *mqpad = NULL;
GST_DEBUG_OBJECT (dbin, "pad %s:%s, group:%p",
GST_DEBUG_PAD_NAME (pad), group);
isdemux = is_demuxer_element (src);
if (!group)
if (!(group = get_current_group (dbin))) {
group = gst_decode_group_new (dbin, isdemux);
DECODE_BIN_LOCK (dbin);
dbin->groups = g_list_append (dbin->groups, group);
DECODE_BIN_UNLOCK (dbin);
newgroup = TRUE;
}
if (isdemux) {
GST_LOG_OBJECT (src, "connecting the pad through multiqueue");
if (!(mqpad = gst_decode_group_control_demuxer_pad (group, pad)))
goto beach;
pad = mqpad;
}
gst_decode_group_control_source_pad (group, pad);
if (newgroup && !isdemux) {
/* If we have discovered a raw pad and it doesn't belong to any group,
* that means there wasn't any demuxer. In that case, we consider the
* group as being complete. */
gst_decode_group_set_complete (group);
}
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);
/* we can only deal with one type, we don't yet support dynamically changing
* caps from the typefind element */
if (decode_bin->have_type)
goto exit;
decode_bin->have_type = TRUE;
pad = gst_element_get_static_pad (typefind, "src");
analyze_new_pad (decode_bin, typefind, pad, caps, NULL);
gst_object_unref (pad);
exit:
return;
}
static void
pad_added_group_cb (GstElement * element, GstPad * pad, GstDecodeGroup * group)
{
GstCaps *caps;
gboolean expose = FALSE;
GST_DEBUG_OBJECT (pad, "pad added, group:%p", group);
caps = gst_pad_get_caps (pad);
analyze_new_pad (group->dbin, element, pad, caps, group);
if (caps)
gst_caps_unref (caps);
GROUP_MUTEX_LOCK (group);
group->nbdynamic--;
GST_LOG ("Group %p has now %d dynamic objects", group, group->nbdynamic);
if (group->nbdynamic == 0)
expose = TRUE;
GROUP_MUTEX_UNLOCK (group);
if (expose) {
GST_LOG
("That was the last dynamic object, now attempting to expose the group");
DECODE_BIN_LOCK (group->dbin);
gst_decode_group_expose (group);
DECODE_BIN_UNLOCK (group->dbin);
}
}
static void
pad_removed_group_cb (GstElement * element, GstPad * pad,
GstDecodeGroup * group)
{
GST_LOG_OBJECT (pad, "pad removed, group:%p", group);
/* In fact, we don't have to do anything here, the active group will be
* removed when the group's multiqueue is drained */
}
static void
no_more_pads_group_cb (GstElement * element, GstDecodeGroup * group)
{
GST_LOG_OBJECT (element, "no more pads, setting group %p to complete", group);
/* FIXME : FILLME */
gst_decode_group_set_complete (group);
}
static void
pad_added_cb (GstElement * element, GstPad * pad, GstDecodeBin * dbin)
{
GstCaps *caps;
GST_LOG_OBJECT (pad, "Pad added to non-grouped element");
caps = gst_pad_get_caps (pad);
analyze_new_pad (dbin, element, pad, caps, NULL);
if (caps)
gst_caps_unref (caps);
}
static void
pad_removed_cb (GstElement * element, GstPad * pad, GstDecodeBin * dbin)
{
GST_LOG_OBJECT (pad, "Pad removed from non-grouped element");
}
static void
no_more_pads_cb (GstElement * element, GstDecodeBin * dbin)
{
GstDecodeGroup *group;
GST_LOG_OBJECT (element, "No more pads, setting current group to complete");
/* Find the non-complete group, there should only be one */
if (!(group = get_current_group (dbin)))
goto no_group;
gst_decode_group_set_complete (group);
return;
no_group:
{
GST_WARNING_OBJECT (dbin, "We couldn't find a non-completed group !!");
return;
}
}
static void
caps_notify_cb (GstPad * pad, GParamSpec * unused, GstDecodeBin * dbin)
{
GstElement *element;
GST_LOG_OBJECT (dbin, "Notified caps for pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
element = GST_ELEMENT_CAST (gst_pad_get_parent (pad));
pad_added_cb (element, pad, dbin);
gst_object_unref (element);
}
static void
caps_notify_group_cb (GstPad * pad, GParamSpec * unused, GstDecodeGroup * group)
{
GstElement *element;
GST_LOG_OBJECT (pad, "Notified caps for pad %s:%s", GST_DEBUG_PAD_NAME (pad));
element = GST_ELEMENT_CAST (gst_pad_get_parent (pad));
pad_added_group_cb (element, pad, group);
gst_object_unref (element);
}
/* this function runs through the element factories and returns a value array of
* all elements that are able to sink the given caps
*/
static GValueArray *
find_compatibles (GstDecodeBin * decode_bin, GstPad * pad, const GstCaps * caps)
{
GValueArray *result;
GST_DEBUG_OBJECT (decode_bin, "finding factories");
result = gst_factory_list_filter (decode_bin->factories, caps);
return result;
}
/* 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 *templates, *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 = templates = 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)
{
GstCaps *intersection;
gboolean res;
GST_LOG_OBJECT (dbin, "Checking with caps %" GST_PTR_FORMAT, caps);
intersection = gst_caps_intersect (dbin->caps, caps);
res = (!(gst_caps_is_empty (intersection)));
gst_caps_unref (intersection);
GST_LOG_OBJECT (dbin, "Caps are %sfinal caps", res ? "" : "not ");
return res;
}
/****
* GstDecodeGroup functions
****/
static void
multi_queue_overrun_cb (GstElement * queue, GstDecodeGroup * group)
{
GST_LOG_OBJECT (group->dbin, "multiqueue is full");
/* if we haven't exposed the group, do it */
DECODE_BIN_LOCK (group->dbin);
gst_decode_group_expose (group);
DECODE_BIN_UNLOCK (group->dbin);
}
static void
multi_queue_underrun_cb (GstElement * queue, GstDecodeGroup * group)
{
GstDecodeBin *dbin = group->dbin;
GST_LOG_OBJECT (dbin, "multiqueue is empty for group %p", group);
/* Check if we need to activate another group */
DECODE_BIN_LOCK (dbin);
if ((group == dbin->activegroup) && dbin->groups) {
GST_DEBUG_OBJECT (dbin, "Switching to new group");
/* unexpose current active */
gst_decode_group_hide (group);
/* expose first group of groups */
gst_decode_group_expose ((GstDecodeGroup *) dbin->groups->data);
}
DECODE_BIN_UNLOCK (dbin);
}
/* gst_decode_group_new
*
* 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, gboolean use_queue)
{
GstDecodeGroup *group;
GstElement *mq;
GST_LOG_OBJECT (dbin, "Creating new group");
if (use_queue) {
if (!(mq = gst_element_factory_make ("multiqueue", NULL))) {
GST_WARNING ("Couldn't create multiqueue element");
return NULL;
}
} else {
mq = NULL;
}
group = g_new0 (GstDecodeGroup, 1);
group->lock = g_mutex_new ();
group->dbin = dbin;
group->multiqueue = mq;
group->exposed = FALSE;
group->drained = FALSE;
group->blocked = FALSE;
group->complete = FALSE;
group->endpads = NULL;
group->reqpads = NULL;
if (mq) {
/* we first configure the multiqueue to buffer an unlimited number of
* buffers up to 5 seconds or, when no timestamps are present, up to 2 MB of
* memory. When this queue overruns, we assume the group is complete and can
* be exposed. */
g_object_set (G_OBJECT (mq),
"max-size-bytes", 2 * 1024 * 1024,
"max-size-time", 5 * GST_SECOND, "max-size-buffers", 0, NULL);
/* will expose the group */
group->overrunsig = g_signal_connect (G_OBJECT (mq), "overrun",
G_CALLBACK (multi_queue_overrun_cb), group);
/* will hide the group again, this is usually called when the multiqueue is
* drained because of EOS. */
group->underrunsig = g_signal_connect (G_OBJECT (mq), "underrun",
G_CALLBACK (multi_queue_underrun_cb), group);
gst_bin_add (GST_BIN (dbin), mq);
gst_element_set_state (mq, GST_STATE_PAUSED);
}
GST_LOG_OBJECT (dbin, "Returning new group %p", group);
return group;
}
/** get_current_group:
*
* Returns the current non-completed group.
*
* Returns NULL if no groups are available, or all groups are completed.
*/
static GstDecodeGroup *
get_current_group (GstDecodeBin * dbin)
{
GList *tmp;
GstDecodeGroup *group = NULL;
DECODE_BIN_LOCK (dbin);
for (tmp = dbin->groups; tmp; tmp = g_list_next (tmp)) {
GstDecodeGroup *this = (GstDecodeGroup *) tmp->data;
GST_LOG_OBJECT (dbin, "group %p, complete:%d", this, this->complete);
if (!this->complete) {
group = this;
break;
}
}
DECODE_BIN_UNLOCK (dbin);
GST_LOG_OBJECT (dbin, "Returning group %p", group);
return group;
}
static gboolean
group_demuxer_event_probe (GstPad * pad, GstEvent * event,
GstDecodeGroup * group)
{
if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
GST_DEBUG_OBJECT (group->dbin,
"Got EOS on group input pads, exposing group if it wasn't before");
DECODE_BIN_LOCK (group->dbin);
gst_decode_group_expose (group);
DECODE_BIN_UNLOCK (group->dbin);
}
return TRUE;
}
/* 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)
{
GstPad *srcpad, *sinkpad;
gchar *nb, *sinkname, *srcname;
GST_LOG ("group:%p pad %s:%s", group, GST_DEBUG_PAD_NAME (pad));
srcpad = NULL;
if (!(sinkpad = gst_element_get_request_pad (group->multiqueue, "sink%d"))) {
GST_ERROR ("Couldn't get sinkpad from multiqueue");
return NULL;
}
if ((gst_pad_link (pad, sinkpad) != GST_PAD_LINK_OK)) {
GST_ERROR ("Couldn't link demuxer and multiqueue");
goto beach;
}
group->reqpads = g_list_append (group->reqpads, sinkpad);
sinkname = gst_pad_get_name (sinkpad);
nb = sinkname + 4;
srcname = g_strdup_printf ("src%s", nb);
g_free (sinkname);
GROUP_MUTEX_LOCK (group);
if (!(srcpad = gst_element_get_pad (group->multiqueue, srcname))) {
GST_ERROR ("Couldn't get srcpad %s from multiqueue", srcname);
goto chiringuito;
}
/* connect event handler on pad to intercept EOS events */
gst_pad_add_event_probe (pad, G_CALLBACK (group_demuxer_event_probe), group);
chiringuito:
g_free (srcname);
GROUP_MUTEX_UNLOCK (group);
beach:
gst_object_unref (sinkpad);
return srcpad;
}
static gboolean
gst_decode_group_control_source_pad (GstDecodeGroup * group, GstPad * pad)
{
GstDecodePad *dpad;
g_return_val_if_fail (group != NULL, FALSE);
GST_LOG ("group:%p , pad %s:%s", group, GST_DEBUG_PAD_NAME (pad));
/* FIXME : check if pad is already controlled */
GROUP_MUTEX_LOCK (group);
/* Create GstDecodePad for the pad */
dpad = gst_decode_pad_new (group, pad, TRUE);
group->endpads = g_list_append (group->endpads, dpad);
GROUP_MUTEX_UNLOCK (group);
return TRUE;
}
/* gst_decode_group_check_if_blocked:
*
* Call this when one of the pads blocked status has changed.
* If the group is complete and blocked, the group will be marked as blocked
* and will ghost/expose all pads on decodebin if the group is the current one.
*
* Call with the group lock taken ! MT safe
*/
static void
gst_decode_group_check_if_blocked (GstDecodeGroup * group)
{
GList *tmp;
gboolean blocked = TRUE;
GST_LOG ("group : %p , ->complete:%d , ->nbdynamic:%d",
group, group->complete, group->nbdynamic);
/* 1. don't do anything if group is not complete */
if (!group->complete || group->nbdynamic) {
GST_DEBUG_OBJECT (group->dbin, "Group isn't complete yet");
return;
}
for (tmp = group->endpads; tmp; tmp = g_list_next (tmp)) {
GstDecodePad *dpad = (GstDecodePad *) tmp->data;
if (!dpad->blocked) {
blocked = FALSE;
break;
}
}
/* 2. Update status of group */
group->blocked = blocked;
GST_LOG ("group is blocked:%d", blocked);
/* 3. don't do anything if not blocked completely */
if (!blocked)
return;
/* 4. if we're the current group, expose pads */
DECODE_BIN_LOCK (group->dbin);
if (!gst_decode_group_expose (group))
GST_WARNING_OBJECT (group->dbin, "Couldn't expose group");
DECODE_BIN_UNLOCK (group->dbin);
}
static void
gst_decode_group_check_if_drained (GstDecodeGroup * group)
{
GList *tmp;
GstDecodeBin *dbin = group->dbin;
gboolean drained = TRUE;
GST_LOG ("group : %p", group);
for (tmp = group->endpads; tmp; tmp = g_list_next (tmp)) {
GstDecodePad *dpad = (GstDecodePad *) tmp->data;
GST_LOG ("testing dpad %p", dpad);
if (!dpad->drained) {
drained = FALSE;
break;
}
}
group->drained = drained;
if (!drained)
return;
/* we are drained. Check if there is a next group to activate */
DECODE_BIN_LOCK (dbin);
if ((group == dbin->activegroup) && dbin->groups) {
GST_DEBUG_OBJECT (dbin, "Switching to new group");
/* hide current group */
gst_decode_group_hide (group);
/* expose next group */
gst_decode_group_expose ((GstDecodeGroup *) dbin->groups->data);
/* we're not yet drained now */
drained = FALSE;
}
DECODE_BIN_UNLOCK (dbin);
if (drained) {
/* no more groups to activate, we're completely drained now */
GST_LOG ("all groups drained, fire signal");
g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_DRAINED], 0,
NULL);
}
}
/* 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)
{
GstPad *a, *b;
gint va, vb;
GstCaps *capsa, *capsb;
GstStructure *sa, *sb;
const gchar *namea, *nameb;
a = da->pad;
b = db->pad;
capsa = gst_pad_get_caps (a);
capsb = gst_pad_get_caps (b);
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;
}
/* gst_decode_group_expose:
*
* Expose this group's pads.
*
* Not MT safe, please take the group lock
*/
static gboolean
gst_decode_group_expose (GstDecodeGroup * group)
{
GList *tmp;
GList *next = NULL;
if (group->dbin->activegroup) {
GST_DEBUG_OBJECT (group->dbin, "A group is already active and exposed");
return TRUE;
}
if (group->dbin->activegroup == group) {
GST_WARNING ("Group %p is already exposed", group);
return TRUE;
}
if (!group->dbin->groups
|| (group != (GstDecodeGroup *) group->dbin->groups->data)) {
GST_WARNING ("Group %p is not the first group to expose", group);
return FALSE;
}
if (group->nbdynamic) {
GST_WARNING ("Group %p still has %d dynamic objects, not exposing yet",
group, group->nbdynamic);
return FALSE;
}
GST_LOG ("Exposing group %p", group);
if (group->multiqueue) {
/* 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). */
g_object_set (G_OBJECT (group->multiqueue),
"max-size-bytes", 2 * 1024 * 1024,
"max-size-time", 2 * GST_SECOND, "max-size-buffers", 5, NULL);
/* we can now disconnect any overrun signal, which is used to expose the
* group. */
if (group->overrunsig) {
GST_LOG ("Disconnecting overrun");
g_signal_handler_disconnect (group->multiqueue, group->overrunsig);
group->overrunsig = 0;
}
}
/* re-order pads : video, then audio, then others */
group->endpads = g_list_sort (group->endpads, (GCompareFunc) sort_end_pads);
/* Expose pads */
for (tmp = group->endpads; tmp; tmp = next) {
GstDecodePad *dpad = (GstDecodePad *) tmp->data;
gchar *padname;
GstPad *ghost;
next = g_list_next (tmp);
/* 1. ghost pad */
padname = g_strdup_printf ("src%d", group->dbin->nbpads);
group->dbin->nbpads++;
GST_LOG_OBJECT (group->dbin, "About to expose pad %s:%s",
GST_DEBUG_PAD_NAME (dpad->pad));
ghost = gst_ghost_pad_new (padname, dpad->pad);
gst_pad_set_active (ghost, TRUE);
gst_element_add_pad (GST_ELEMENT (group->dbin), ghost);
group->ghosts = g_list_append (group->ghosts, ghost);
g_free (padname);
/* 2. emit signal */
GST_DEBUG_OBJECT (group->dbin, "emitting new-decoded-pad");
g_signal_emit (G_OBJECT (group->dbin),
gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD], 0, ghost,
(next == NULL));
GST_DEBUG_OBJECT (group->dbin, "emitted new-decoded-pad");
}
/* signal no-more-pads. This allows the application to hook stuff to the
* exposed pads */
GST_LOG_OBJECT (group->dbin, "signalling no-more-pads");
gst_element_no_more_pads (GST_ELEMENT (group->dbin));
/* 3. Unblock internal pads. The application should have connected stuff now
* so that streaming can continue. */
for (tmp = group->endpads; tmp; tmp = next) {
GstDecodePad *dpad = (GstDecodePad *) tmp->data;
next = g_list_next (tmp);
GST_DEBUG_OBJECT (dpad->pad, "unblocking");
gst_pad_set_blocked_async (dpad->pad, FALSE,
(GstPadBlockCallback) source_pad_blocked_cb, dpad);
GST_DEBUG_OBJECT (dpad->pad, "unblocked");
}
group->dbin->activegroup = group;
/* pop off the first group */
group->dbin->groups =
g_list_delete_link (group->dbin->groups, group->dbin->groups);
remove_fakesink (group->dbin);
group->exposed = TRUE;
GST_LOG_OBJECT (group->dbin, "Group %p exposed", group);
return TRUE;
}
static void
gst_decode_group_hide (GstDecodeGroup * group)
{
GList *tmp;
GST_LOG ("Hiding group %p", group);
if (group != group->dbin->activegroup) {
GST_WARNING ("This group is not the active one, aborting");
return;
}
GROUP_MUTEX_LOCK (group);
/* Remove ghost pads */
for (tmp = group->ghosts; tmp; tmp = g_list_next (tmp))
gst_element_remove_pad (GST_ELEMENT (group->dbin), (GstPad *) tmp->data);
g_list_free (group->ghosts);
group->ghosts = NULL;
group->exposed = FALSE;
GROUP_MUTEX_UNLOCK (group);
group->dbin->activegroup = NULL;
group->dbin->oldgroups = g_list_append (group->dbin->oldgroups, group);
}
static void
deactivate_free_recursive (GstDecodeGroup * group, GstElement * element)
{
GstIterator *it;
GstIteratorResult res;
gpointer point;
GST_LOG ("element:%s", GST_ELEMENT_NAME (element));
/* call on downstream elements */
it = gst_element_iterate_src_pads (element);
restart:
while (1) {
res = gst_iterator_next (it, &point);
switch (res) {
case GST_ITERATOR_DONE:
goto done;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (it);
goto restart;
case GST_ITERATOR_ERROR:
{
GST_WARNING ("Had an error while iterating source pads of element: %s",
GST_ELEMENT_NAME (element));
goto beach;
}
case GST_ITERATOR_OK:
{
GstPad *pad = GST_PAD (point);
GstPad *peerpad = NULL;
if ((peerpad = gst_pad_get_peer (pad))) {
GstObject *parent;
parent = gst_pad_get_parent (peerpad);
gst_object_unref (peerpad);
if (parent && GST_IS_ELEMENT (parent))
deactivate_free_recursive (group, GST_ELEMENT (parent));
if (parent)
gst_object_unref (parent);
}
}
break;
default:
break;
}
}
done:
gst_element_set_state (element, GST_STATE_NULL);
gst_bin_remove (GST_BIN (group->dbin), element);
beach:
gst_iterator_free (it);
return;
}
static void
gst_decode_group_free (GstDecodeGroup * group)
{
GList *tmp;
GST_LOG ("group %p", group);
GROUP_MUTEX_LOCK (group);
/* free ghost pads */
if (group == group->dbin->activegroup) {
for (tmp = group->ghosts; tmp; tmp = g_list_next (tmp))
gst_element_remove_pad (GST_ELEMENT (group->dbin), (GstPad *) tmp->data);
g_list_free (group->ghosts);
group->ghosts = NULL;
}
/* Clear all GstDecodePad */
for (tmp = group->endpads; tmp; tmp = g_list_next (tmp)) {
GstDecodePad *dpad = (GstDecodePad *) tmp->data;
g_free (dpad);
}
g_list_free (group->endpads);
group->endpads = NULL;
/* release request pads */
for (tmp = group->reqpads; tmp; tmp = g_list_next (tmp)) {
gst_element_release_request_pad (group->multiqueue, GST_PAD (tmp->data));
}
g_list_free (group->reqpads);
group->reqpads = NULL;
/* disconnect signal handlers on multiqueue */
if (group->multiqueue) {
if (group->underrunsig)
g_signal_handler_disconnect (group->multiqueue, group->underrunsig);
if (group->overrunsig)
g_signal_handler_disconnect (group->multiqueue, group->overrunsig);
deactivate_free_recursive (group, group->multiqueue);
}
/* remove all elements */
GROUP_MUTEX_UNLOCK (group);
g_mutex_free (group->lock);
g_free (group);
}
/* gst_decode_group_set_complete:
*
* Mark the group as complete. This means no more streams will be controlled
* through this group.
*
* MT safe
*/
static void
gst_decode_group_set_complete (GstDecodeGroup * group)
{
GST_LOG_OBJECT (group->dbin, "Setting group %p to COMPLETE", group);
GROUP_MUTEX_LOCK (group);
group->complete = TRUE;
gst_decode_group_check_if_blocked (group);
GROUP_MUTEX_UNLOCK (group);
}
/*************************
* GstDecodePad functions
*************************/
static void
source_pad_blocked_cb (GstPad * pad, gboolean blocked, GstDecodePad * dpad)
{
GST_LOG_OBJECT (pad, "blocked:%d , dpad:%p, dpad->group:%p",
blocked, dpad, dpad->group);
/* Update this GstDecodePad status */
dpad->blocked = blocked;
if (blocked) {
GROUP_MUTEX_LOCK (dpad->group);
gst_decode_group_check_if_blocked (dpad->group);
GROUP_MUTEX_UNLOCK (dpad->group);
}
}
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) {
/* Set our pad as drained */
dpad->drained = TRUE;
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_group_check_if_drained (dpad->group);
}
/* never drop events */
return TRUE;
}
/*gst_decode_pad_new:
*
* Creates a new GstDecodePad for the given pad.
* If block is TRUE, Sets the pad blocking asynchronously
*/
static GstDecodePad *
gst_decode_pad_new (GstDecodeGroup * group, GstPad * pad, gboolean block)
{
GstDecodePad *dpad;
dpad = g_new0 (GstDecodePad, 1);
dpad->pad = pad;
dpad->group = group;
dpad->blocked = FALSE;
dpad->drained = TRUE;
if (block)
gst_pad_set_blocked_async (pad, TRUE,
(GstPadBlockCallback) source_pad_blocked_cb, dpad);
gst_pad_add_event_probe (pad, G_CALLBACK (source_pad_event_probe), dpad);
return dpad;
}
/*****
* Element add/remove
*****/
/*
* add_fakesink / remove_fakesink
*
* We use a sink so that the parent ::change_state returns GST_STATE_CHANGE_ASYNC
* when that sink is present (since it's not connected to anything it will
* always return GST_STATE_CHANGE_ASYNC).
*
* But this is an ugly way of achieving this goal.
* Ideally, we shouldn't use a sink and just return GST_STATE_CHANGE_ASYNC in
* our ::change_state if we have not exposed the active group.
* We also need to override ::get_state to fake the asynchronous behaviour.
* Once the active group is exposed, we would then post a
* GST_MESSAGE_STATE_DIRTY and return GST_STATE_CHANGE_SUCCESS (which will call
* ::get_state .
*/
static gboolean
add_fakesink (GstDecodeBin * decode_bin)
{
GST_DEBUG_OBJECT (decode_bin, "Adding the fakesink");
if (decode_bin->fakesink)
return TRUE;
decode_bin->fakesink =
gst_element_factory_make ("fakesink", "async-fakesink");
if (!decode_bin->fakesink)
goto no_fakesink;
/* enable sync so that we force ASYNC preroll */
g_object_set (G_OBJECT (decode_bin->fakesink), "sync", TRUE, NULL);
/* hacky, remove sink flag, we don't want our decodebin to become a sink
* just because we add a fakesink element to make us ASYNC */
GST_OBJECT_FLAG_UNSET (decode_bin->fakesink, GST_ELEMENT_IS_SINK);
if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->fakesink))
goto could_not_add;
return TRUE;
/* ERRORS */
no_fakesink:
{
g_warning ("can't find fakesink element, decodebin will not work");
return FALSE;
}
could_not_add:
{
g_warning ("Could not add fakesink to decodebin, decodebin will not work");
gst_object_unref (decode_bin->fakesink);
decode_bin->fakesink = NULL;
return FALSE;
}
}
static void
remove_fakesink (GstDecodeBin * decode_bin)
{
if (decode_bin->fakesink == NULL)
return;
GST_DEBUG_OBJECT (decode_bin, "Removing the fakesink");
gst_element_set_state (decode_bin->fakesink, GST_STATE_NULL);
gst_bin_remove (GST_BIN (decode_bin), decode_bin->fakesink);
decode_bin->fakesink = NULL;
}
/*****
* 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;
}
static GstStateChangeReturn
gst_decode_bin_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstDecodeBin *dbin = GST_DECODE_BIN (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (dbin->typefind == NULL)
goto missing_typefind;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:{
dbin->have_type = FALSE;
if (!add_fakesink (dbin))
goto missing_fakesink;
break;
}
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
/* FIXME : put some cleanup functions here.. if needed */
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;
}
missing_fakesink:
{
gst_element_post_message (element,
gst_missing_element_message_new (element, "fakesink"));
GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), ("no fakesink!"));
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);
#endif /* ENABLE_NLS */
return gst_element_register (plugin, "decodebin2", GST_RANK_NONE,
GST_TYPE_DECODE_BIN);
}
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