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gstreamer/gst/playback/gstplaybin.c
Wim Taymans 5d374bf5ea gst/playback/: Cleanups and some more documentation. 
Original commit message from CVS:
* gst/playback/README:
* gst/playback/gstdecodebin.c: (close_pad_link), (try_to_link_1):
* gst/playback/gstplaybin.c: (gst_play_bin_init),
(gst_play_bin_dispose), (gst_play_bin_set_property),
(remove_sinks), (setup_sinks), (gst_play_bin_change_state),
(gst_play_bin_get_event_masks), (gst_play_bin_send_event),
(gst_play_bin_get_formats), (gst_play_bin_convert),
(gst_play_bin_get_query_types), (gst_play_bin_query):
Cleanups and some more documentation.
2004-11-09 14:37:51 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include "gstplaybasebin.h"
GST_DEBUG_CATEGORY_STATIC (gst_play_bin_debug);
#define GST_CAT_DEFAULT gst_play_bin_debug
#define GST_TYPE_PLAY_BIN (gst_play_bin_get_type())
#define GST_PLAY_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PLAY_BIN,GstPlayBin))
#define GST_PLAY_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PLAY_BIN,GstPlayBinClass))
#define GST_IS_PLAY_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PLAY_BIN))
#define GST_IS_PLAY_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PLAY_BIN))
#define VOLUME_MAX_DOUBLE 4.0
typedef struct _GstPlayBin GstPlayBin;
typedef struct _GstPlayBinClass GstPlayBinClass;
struct _GstPlayBin
{
GstPlayBaseBin parent;
/* the configurable elements */
GstElement *audio_sink;
GstElement *video_sink;
GstElement *visualisation;
GstElement *volume_element;
gfloat volume;
/* these are the currently active sinks */
GList *sinks;
/* these are the sink elements used for seeking/query etc.. */
GList *seekables;
/* the last captured frame for snapshots */
GstBuffer *frame;
/* our cache for the sinks */
GHashTable *cache;
};
struct _GstPlayBinClass
{
GstPlayBaseBinClass parent_class;
};
/* props */
enum
{
ARG_0,
ARG_AUDIO_SINK,
ARG_VIDEO_SINK,
ARG_VIS_PLUGIN,
ARG_VOLUME,
ARG_FRAME
};
/* signals */
enum
{
LAST_SIGNAL
};
static void gst_play_bin_class_init (GstPlayBinClass * klass);
static void gst_play_bin_init (GstPlayBin * play_bin);
static void gst_play_bin_dispose (GObject * object);
static void setup_sinks (GstPlayBaseBin * play_base_bin);
static void remove_sinks (GstPlayBin * play_bin);
static void gst_play_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * spec);
static void gst_play_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * spec);
static GstElementStateReturn gst_play_bin_change_state (GstElement * element);
static const GstEventMask *gst_play_bin_get_event_masks (GstElement * element);
static gboolean gst_play_bin_send_event (GstElement * element,
GstEvent * event);
static const GstFormat *gst_play_bin_get_formats (GstElement * element);
static gboolean gst_play_bin_convert (GstElement * element,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value);
static const GstQueryType *gst_play_bin_get_query_types (GstElement * element);
static gboolean gst_play_bin_query (GstElement * element, GstQueryType type,
GstFormat * format, gint64 * value);
static GstElementClass *parent_class;
//static guint gst_play_bin_signals[LAST_SIGNAL] = { 0 };
static GstElementDetails gst_play_bin_details = {
"Player Bin",
"Generic/Bin/Player",
"Autoplug and play media from an uri",
"Wim Taymans <wim@fluendo.com>"
};
static GType
gst_play_bin_get_type (void)
{
static GType gst_play_bin_type = 0;
if (!gst_play_bin_type) {
static const GTypeInfo gst_play_bin_info = {
sizeof (GstPlayBinClass),
NULL,
NULL,
(GClassInitFunc) gst_play_bin_class_init,
NULL,
NULL,
sizeof (GstPlayBin),
0,
(GInstanceInitFunc) gst_play_bin_init,
NULL
};
gst_play_bin_type = g_type_register_static (GST_TYPE_PLAY_BASE_BIN,
"GstPlayBin", &gst_play_bin_info, 0);
}
return gst_play_bin_type;
}
static void
gst_play_bin_class_init (GstPlayBinClass * klass)
{
GObjectClass *gobject_klass;
GstElementClass *gstelement_klass;
GstBinClass *gstbin_klass;
GstPlayBaseBinClass *playbasebin_klass;
gobject_klass = (GObjectClass *) klass;
gstelement_klass = (GstElementClass *) klass;
gstbin_klass = (GstBinClass *) klass;
playbasebin_klass = (GstPlayBaseBinClass *) klass;
parent_class = g_type_class_ref (gst_play_base_bin_get_type ());
gobject_klass->set_property = gst_play_bin_set_property;
gobject_klass->get_property = gst_play_bin_get_property;
g_object_class_install_property (gobject_klass, ARG_VIDEO_SINK,
g_param_spec_object ("video-sink", "Video Sink",
"the video output element to use (NULL = default sink)",
GST_TYPE_ELEMENT, G_PARAM_READWRITE));
g_object_class_install_property (gobject_klass, ARG_AUDIO_SINK,
g_param_spec_object ("audio-sink", "Audio Sink",
"the audio output element to use (NULL = default sink)",
GST_TYPE_ELEMENT, G_PARAM_READWRITE));
g_object_class_install_property (gobject_klass, ARG_VIS_PLUGIN,
g_param_spec_object ("vis-plugin", "Vis plugin",
"the visualization element to use (NULL = none)",
GST_TYPE_ELEMENT, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (gobject_klass), ARG_VOLUME,
g_param_spec_double ("volume", "volume", "volume",
0.0, VOLUME_MAX_DOUBLE, 1.0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (gobject_klass), ARG_FRAME,
g_param_spec_boxed ("frame", "Frame",
"The last frame (NULL = no video available)",
GST_TYPE_BUFFER, G_PARAM_READABLE));
gobject_klass->dispose = GST_DEBUG_FUNCPTR (gst_play_bin_dispose);
gst_element_class_set_details (gstelement_klass, &gst_play_bin_details);
gstelement_klass->change_state =
GST_DEBUG_FUNCPTR (gst_play_bin_change_state);
gstelement_klass->get_event_masks =
GST_DEBUG_FUNCPTR (gst_play_bin_get_event_masks);
gstelement_klass->send_event = GST_DEBUG_FUNCPTR (gst_play_bin_send_event);
gstelement_klass->get_formats = GST_DEBUG_FUNCPTR (gst_play_bin_get_formats);
gstelement_klass->convert = GST_DEBUG_FUNCPTR (gst_play_bin_convert);
gstelement_klass->get_query_types =
GST_DEBUG_FUNCPTR (gst_play_bin_get_query_types);
gstelement_klass->query = GST_DEBUG_FUNCPTR (gst_play_bin_query);
playbasebin_klass->setup_output_pads = setup_sinks;
}
static void
gst_play_bin_init (GstPlayBin * play_bin)
{
play_bin->video_sink = NULL;
play_bin->audio_sink = NULL;
play_bin->visualisation = NULL;
play_bin->volume_element = NULL;
play_bin->volume = 1.0;
play_bin->seekables = NULL;
play_bin->sinks = NULL;
play_bin->frame = NULL;
play_bin->cache = g_hash_table_new_full (g_str_hash, g_str_equal,
NULL, g_object_unref);
/* no iterate is needed */
GST_FLAG_SET (play_bin, GST_BIN_SELF_SCHEDULABLE);
}
static void
gst_play_bin_dispose (GObject * object)
{
GstPlayBin *play_bin;
play_bin = GST_PLAY_BIN (object);
remove_sinks (play_bin);
g_hash_table_destroy (play_bin->cache);
if (G_OBJECT_CLASS (parent_class)->dispose) {
G_OBJECT_CLASS (parent_class)->dispose (object);
}
}
static void
gst_play_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPlayBin *play_bin;
g_return_if_fail (GST_IS_PLAY_BIN (object));
play_bin = GST_PLAY_BIN (object);
switch (prop_id) {
case ARG_VIDEO_SINK:
play_bin->video_sink = g_value_get_object (value);
/* when changing the videosink, we just remove the
* video pipeline from the cache so that it will be
* regenerated with the new sink element */
g_hash_table_remove (play_bin->cache, "vbin");
break;
case ARG_AUDIO_SINK:
play_bin->audio_sink = g_value_get_object (value);
g_hash_table_remove (play_bin->cache, "abin");
break;
case ARG_VIS_PLUGIN:
play_bin->visualisation = g_value_get_object (value);
break;
case ARG_VOLUME:
if (play_bin->volume_element) {
play_bin->volume = g_value_get_double (value);
g_object_set (G_OBJECT (play_bin->volume_element), "volume",
play_bin->volume, NULL);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_play_bin_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstPlayBin *play_bin;
g_return_if_fail (GST_IS_PLAY_BIN (object));
play_bin = GST_PLAY_BIN (object);
switch (prop_id) {
case ARG_VIDEO_SINK:
g_value_set_object (value, play_bin->video_sink);
break;
case ARG_AUDIO_SINK:
g_value_set_object (value, play_bin->audio_sink);
break;
case ARG_VIS_PLUGIN:
g_value_set_object (value, play_bin->visualisation);
break;
case ARG_VOLUME:
g_value_set_double (value, play_bin->volume);
break;
case ARG_FRAME:
g_value_set_boxed (value, play_bin->frame);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* signal fired when the identity has received a new buffer. This is used for
* making screenshots.
*/
static void
handoff (GstElement * identity, GstBuffer * frame, gpointer data)
{
GstPlayBin *play_bin = GST_PLAY_BIN (data);
if (play_bin->frame) {
gst_buffer_unref (play_bin->frame);
}
play_bin->frame = gst_buffer_ref (frame);
}
/* make the element (bin) that contains the elements needed to perform
* video display. We connect a handoff signal to identity so that we
* can grab snapshots. Identity's sinkpad is ghosted to vbin.
*
* +-------------------------------------------------------------+
* | vbin |
* | +--------+ +----------+ +----------+ +---------+ |
* | |identity| |colorspace| |videoscale| |videosink| |
* | +-sink src-sink src-sink src-sink | |
* | | +---+----+ +----------+ +----------+ +---------+ |
* sink-+ | |
* +----------|--------------------------------------------------+
* handoff
*/
static GstElement *
gen_video_element (GstPlayBin * play_bin)
{
GstElement *element;
GstElement *conv;
GstElement *scale;
GstElement *sink;
GstElement *identity;
/* first see if we have it in the cache */
element = g_hash_table_lookup (play_bin->cache, "vbin");
if (element != NULL) {
g_object_ref (G_OBJECT (element));
/* need to get the video sink element as we need to add it to the
* list of seekable elements */
sink = g_hash_table_lookup (play_bin->cache, "video_sink");
goto done;
}
element = gst_bin_new ("vbin");
identity = gst_element_factory_make ("identity", "id");
g_signal_connect (identity, "handoff", G_CALLBACK (handoff), play_bin);
conv = gst_element_factory_make ("ffmpegcolorspace", "vconv");
scale = gst_element_factory_make ("videoscale", "vscale");
if (play_bin->video_sink) {
gst_object_ref (GST_OBJECT (play_bin->video_sink));
sink = play_bin->video_sink;
} else {
sink = gst_element_factory_make ("xvimagesink", "sink");
}
g_hash_table_insert (play_bin->cache, "video_sink", sink);
gst_bin_add (GST_BIN (element), identity);
gst_bin_add (GST_BIN (element), conv);
gst_bin_add (GST_BIN (element), scale);
gst_bin_add (GST_BIN (element), sink);
gst_element_link_pads (identity, "src", conv, "sink");
gst_element_link_pads (conv, "src", scale, "sink");
gst_element_link_pads (scale, "src", sink, "sink");
gst_element_add_ghost_pad (element, gst_element_get_pad (identity, "sink"),
"sink");
gst_element_set_state (element, GST_STATE_READY);
/* ref before adding to the cache */
g_object_ref (G_OBJECT (element));
g_hash_table_insert (play_bin->cache, "vbin", element);
done:
play_bin->seekables = g_list_append (play_bin->seekables, sink);
return element;
}
/* make the element (bin) that contains the elements needed to perform
* audio playback.
*
* +-------------------------------------------------------------+
* | abin |
* | +---------+ +----------+ +---------+ +---------+ |
* | |audioconv| |audioscale| | volume | |audiosink| |
* | +-sink src-sink src-sink src-sink | |
* | | +---------+ +----------+ +---------+ +---------+ |
* sink-+ |
* +-------------------------------------------------------------+
*
*/
static GstElement *
gen_audio_element (GstPlayBin * play_bin)
{
GstElement *element;
GstElement *conv;
GstElement *sink;
GstElement *volume;
GstElement *scale;
element = g_hash_table_lookup (play_bin->cache, "abin");
if (element != NULL) {
g_object_ref (G_OBJECT (element));
sink = g_hash_table_lookup (play_bin->cache, "audio_sink");
goto done;
}
element = gst_bin_new ("abin");
conv = gst_element_factory_make ("audioconvert", "aconv");
scale = gst_element_factory_make ("audioscale", "ascale");
volume = gst_element_factory_make ("volume", "volume");
g_object_set (G_OBJECT (volume), "volume", play_bin->volume, NULL);
play_bin->volume_element = volume;
if (play_bin->audio_sink) {
gst_object_ref (GST_OBJECT (play_bin->audio_sink));
sink = play_bin->audio_sink;
} else {
sink = gst_element_factory_make ("osssink", "sink");
}
g_hash_table_insert (play_bin->cache, "audio_sink", sink);
gst_bin_add (GST_BIN (element), conv);
gst_bin_add (GST_BIN (element), scale);
gst_bin_add (GST_BIN (element), volume);
gst_bin_add (GST_BIN (element), sink);
gst_element_link_pads (conv, "src", scale, "sink");
gst_element_link_pads (scale, "src", volume, "sink");
gst_element_link_pads (volume, "src", sink, "sink");
gst_element_add_ghost_pad (element,
gst_element_get_pad (conv, "sink"), "sink");
gst_element_set_state (element, GST_STATE_READY);
/* ref before adding to the cache */
g_object_ref (G_OBJECT (element));
g_hash_table_insert (play_bin->cache, "abin", element);
done:
play_bin->seekables = g_list_prepend (play_bin->seekables, sink);
return element;
}
/* make the element (bin) that contains the elements needed to perform
* visualisation ouput. The idea is to split the audio using tee, then
* sending the output to the regular audio bin and the other output to
* the vis plugin that transforms it into a video that is rendered with the
* normal video bin. The video bin is run in a thread to make sure it does
* not block the audio playback pipeline.
*
* +--------------------------------------------------------------------------+
* | visbin |
* | +------+ +----------------+ |
* | | tee | | abin ... | |
* | +-sink src-sink | |
* | | | | +----------------+ +-------------------+ |
* | | | | | vthread | |
* | | | | +---------+ +------+ +------+ | +--------------+ | |
* | | | | |audioconv| | vis | |vqueue| | | vbin ... | | |
* | | | src-sink src-sink src-sink src-sink | | |
* | | | | +---------+ +------+ +------+ | +--------------+ | |
* | | | | +-------------------+ |
* | | +------+ |
* sink-+ |
* +--------------------------------------------------------------------------+
*/
static GstElement *
gen_vis_element (GstPlayBin * play_bin)
{
GstElement *element;
GstElement *tee;
GstElement *asink;
GstElement *vsink;
GstElement *conv;
GstElement *vis;
GstElement *vqueue;
GstElement *vthread;
element = gst_bin_new ("visbin");
tee = gst_element_factory_make ("tee", "tee");
vqueue = gst_element_factory_make ("queue", "vqueue");
vthread = gst_element_factory_make ("thread", "vthread");
asink = gen_audio_element (play_bin);
vsink = gen_video_element (play_bin);
gst_bin_add (GST_BIN (element), asink);
gst_bin_add (GST_BIN (element), vqueue);
gst_bin_add (GST_BIN (vthread), vsink);
gst_bin_add (GST_BIN (element), vthread);
gst_bin_add (GST_BIN (element), tee);
conv = gst_element_factory_make ("audioconvert", "aconv");
if (play_bin->visualisation) {
gst_object_ref (GST_OBJECT (play_bin->visualisation));
vis = play_bin->visualisation;
} else {
vis = gst_element_factory_make ("goom", "vis");
}
gst_bin_add (GST_BIN (element), conv);
gst_bin_add (GST_BIN (element), vis);
gst_element_link_pads (conv, "src", vis, "sink");
gst_element_link_pads (vis, "src", vqueue, "sink");
gst_element_link_pads (vqueue, "src", vsink, "sink");
gst_pad_link (gst_element_get_request_pad (tee, "src%d"),
gst_element_get_pad (asink, "sink"));
gst_pad_link (gst_element_get_request_pad (tee, "src%d"),
gst_element_get_pad (conv, "sink"));
gst_element_add_ghost_pad (element,
gst_element_get_pad (tee, "sink"), "sink");
return element;
}
/* get rid of all installed sinks */
static void
remove_sinks (GstPlayBin * play_bin)
{
GList *sinks;
GstObject *parent;
GstElement *element;
GST_DEBUG ("removesinks");
element = g_hash_table_lookup (play_bin->cache, "abin");
if (element != NULL) {
parent = gst_element_get_parent (element);
if (parent != NULL) {
/* we remove the element from the parent so that
* there is no unwanted state change when the parent
* is disposed */
gst_bin_remove (GST_BIN (parent), element);
}
}
element = g_hash_table_lookup (play_bin->cache, "vbin");
if (element != NULL) {
parent = gst_element_get_parent (element);
if (parent != NULL) {
gst_bin_remove (GST_BIN (parent), element);
}
}
for (sinks = play_bin->sinks; sinks; sinks = g_list_next (sinks)) {
GstElement *element = GST_ELEMENT (sinks->data);
GST_LOG ("removing sink %p", element);
gst_bin_remove (GST_BIN (play_bin), element);
}
g_list_free (play_bin->sinks);
g_list_free (play_bin->seekables);
play_bin->sinks = NULL;
play_bin->seekables = NULL;
if (play_bin->frame) {
gst_buffer_unref (play_bin->frame);
play_bin->frame = NULL;
}
}
/* loop over the streams and set up the pipeline to play this
* media file. First we count the number of audio and video streams.
* If there is no video stream but there exists an audio stream,
* we install a visualisation pipeline.
*
* Also make sure to only connect the first audio and video pad. FIXME
* this should eventually be handled with a tuner interface so that
* one can switch the streams.
*/
static void
setup_sinks (GstPlayBaseBin * play_base_bin)
{
GstPlayBin *play_bin = GST_PLAY_BIN (play_base_bin);
GList *streaminfo;
GList *s;
gint num_audio = 0;
gint num_video = 0;
gboolean need_vis = FALSE;
/* FIXME: do this nicer, like taking a look at the installed
* bins and figuring out if we can simply reconnect them, remove
* or add them. */
if (GST_STATE (play_base_bin) == GST_STATE_PLAYING) {
remove_sinks (play_bin);
}
GST_DEBUG ("setupsinks");
/* get info about the stream */
g_object_get (G_OBJECT (play_bin), "stream-info", &streaminfo, NULL);
/* first examine the streams we have */
for (s = streaminfo; s; s = g_list_next (s)) {
GObject *obj = G_OBJECT (s->data);
gint type;
GstPad *srcpad;
g_object_get (obj, "type", &type, NULL);
/* we don't care about streams with their own sink */
if (type == 4)
continue;
/* else we need to get the pad */
g_object_get (obj, "object", &srcpad, NULL);
/* hmm.. pad is allready linked */
if (gst_pad_is_linked (srcpad))
continue;
if (type == 1) {
num_audio++;
} else if (type == 2) {
num_video++;
}
}
/* no video, use vis */
if (num_video == 0 && num_audio > 0 && play_bin->visualisation) {
need_vis = TRUE;
}
num_audio = 0;
num_video = 0;
/* now actually connect everything */
for (s = streaminfo; s; s = g_list_next (s)) {
GObject *obj = G_OBJECT (s->data);
gint type;
GstPad *srcpad, *sinkpad;
GstElement *sink = NULL;
gboolean res;
gboolean mute = FALSE;
GstObject *object;
g_object_get (obj, "type", &type, NULL);
g_object_get (obj, "object", &object, NULL);
/* use the sink elements as seek entry point */
if (type == 4) {
play_bin->seekables = g_list_prepend (play_bin->seekables, object);
continue;
}
srcpad = GST_PAD (object);
/* pas is allready linked, go to the next pad */
if (gst_pad_is_linked (srcpad))
continue;
if (type == 1) {
if (num_audio > 0) {
g_warning ("two audio streams found, playing first one");
mute = TRUE;
} else {
if (need_vis) {
sink = gen_vis_element (play_bin);
} else {
sink = gen_audio_element (play_bin);
}
num_audio++;
}
} else if (type == 2) {
if (num_video > 0) {
g_warning ("two video streams found, playing first one");
mute = TRUE;
} else {
sink = gen_video_element (play_bin);
num_video++;
}
} else if (type == 4) {
/* we can ignore these streams here */
} else {
g_warning ("unknown stream found");
mute = TRUE;
}
/* we found a sink for this stream, now try to install it */
if (sink != NULL) {
gst_object_ref (GST_OBJECT (sink));
gst_bin_add (GST_BIN (play_bin), sink);
GST_DEBUG ("Adding sink with state %d (parent: %d, peer: %d)\n",
GST_STATE (sink), GST_STATE (play_bin),
GST_STATE (gst_pad_get_parent (srcpad)));
sinkpad = gst_element_get_pad (sink, "sink");
/* try to link the pad of the sink to the stream */
res = gst_pad_link (srcpad, sinkpad);
if (!res) {
gchar *capsstr;
/* could not link this stream */
capsstr = gst_caps_to_string (gst_pad_get_caps (srcpad));
g_warning ("could not link %s", capsstr);
g_free (capsstr);
GST_LOG ("removing sink %p", sink);
gst_bin_remove (GST_BIN (play_bin), sink);
mute = TRUE;
} else {
/* we got the sink succesfully linked, now keep the sink
* in out internal list */
play_bin->sinks = g_list_prepend (play_bin->sinks, sink);
}
}
if (mute) {
/* no sink found/needed for this stream. We mute the stream
* so that it does not take any resources */
g_object_set (G_OBJECT (obj), "mute", TRUE, NULL);
}
}
}
static GstElementStateReturn
gst_play_bin_change_state (GstElement * element)
{
GstElementStateReturn ret;
GstPlayBin *play_bin;
int transition;
play_bin = GST_PLAY_BIN (element);
transition = GST_STATE_TRANSITION (element);
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
if (ret == GST_STATE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
remove_sinks (play_bin);
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
static const GstEventMask *
gst_play_bin_get_event_masks (GstElement * element)
{
/* FIXME, get the list from the number of installed sinks */
return NULL;
}
/* send an event to all the sinks */
static gboolean
gst_play_bin_send_event (GstElement * element, GstEvent * event)
{
gboolean res = FALSE;
GList *s;
GstPlayBin *play_bin;
GstElementState state;
gboolean need_pause = FALSE;
play_bin = GST_PLAY_BIN (element);
state = gst_element_get_state (element);
/* we pause the pipeline first before sending the event. We only
* do this if the pipeline was playing. */
if (state == GST_STATE_PLAYING) {
need_pause = TRUE;
gst_element_set_state (element, GST_STATE_PAUSED);
}
/* loop over all seekables and send the event to them */
for (s = play_bin->seekables; s; s = g_list_next (s)) {
GstElement *element = GST_ELEMENT (s->data);
gboolean ok;
/* ref each event before sending it */
gst_event_ref (event);
ok = gst_element_send_event (element, event);
res |= ok;
}
gst_event_unref (event);
/* and restart the pipeline if we paused it */
if (need_pause)
gst_element_set_state (element, GST_STATE_PLAYING);
return res;
}
static const GstFormat *
gst_play_bin_get_formats (GstElement * element)
{
/* FIXME, compile this list from the installed sinks */
static GstFormat formats[] = {
GST_FORMAT_TIME,
0,
};
return formats;
}
static gboolean
gst_play_bin_convert (GstElement * element,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = FALSE;
GList *s;
GstPlayBin *play_bin;
play_bin = GST_PLAY_BIN (element);
/* do a conversion, loop over all sinks, stop as soon as one of the
* sinks returns a successful result */
for (s = play_bin->seekables; s; s = g_list_next (s)) {
GstElement *element = GST_ELEMENT (s->data);
res = gst_element_convert (element, src_format, src_value,
dest_format, dest_value);
if (res)
break;
}
return res;
}
static const GstQueryType *
gst_play_bin_get_query_types (GstElement * element)
{
/* FIXME, compile from the installed sinks */
static const GstQueryType query_types[] = {
GST_QUERY_TOTAL,
GST_QUERY_POSITION,
0
};
return query_types;
}
static gboolean
gst_play_bin_query (GstElement * element, GstQueryType type,
GstFormat * format, gint64 * value)
{
gboolean res = FALSE;
GList *s;
GstPlayBin *play_bin;
play_bin = GST_PLAY_BIN (element);
for (s = play_bin->seekables; s; s = g_list_next (s)) {
GstElement *element = GST_ELEMENT (s->data);
res = gst_element_query (element, type, format, value);
if (res)
break;
}
return res;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_play_bin_debug, "playbin", 0, "play bin");
return gst_element_register (plugin, "playbin", GST_RANK_NONE,
GST_TYPE_PLAY_BIN);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"playbin",
"player bin", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)
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