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gstreamer/gst/playback/gstplaybin.c
Tim-Philipp Müller d35f4efe67 gst/playback/gstplaybin.c: Improve docs: point out that the application needs to assist playbin with buffering. 
Original commit message from CVS:
* gst/playback/gstplaybin.c:
Improve docs: point out that the application needs to assist playbin
with buffering.
2007-02-23 18:49:29 +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.
*/
/**
* SECTION:element-playbin
*
* <refsect2>
* <para>
* Playbin provides a stand-alone everything-in-one abstraction for an
* audio and/or video player.
* </para>
* <para>
* It can handle both audio and video files and features
* <itemizedlist>
* <listitem>
* automatic file type recognition and based on that automatic
* selection and usage of the right audio/video/subtitle demuxers/decoders
* </listitem>
* <listitem>
* visualisations for audio files
* </listitem>
* <listitem>
* subtitle support for video files
* </listitem>
* <listitem>
* stream selection between different audio/subtitles streams
* </listitem>
* <listitem>
* meta info (tag) extraction
* </listitem>
* <listitem>
* easy access to the last video frame
* </listitem>
* <listitem>
* buffering when playing streams over a network
* </listitem>
* <listitem>
* volume control
* </listitem>
* </itemizedlist>
* </para>
* <title>Usage</title>
* <para>
* A playbin element can be created just like any other element using
* gst_element_factory_make(). The file/URI to play should be set via the "uri"
* property. This must be an absolute URI, relative file paths are not allowed.
* Example URIs are file:///home/joe/movie.avi or http://www.joedoe.com/foo.ogg
* </para>
* <para>
* Playbin is a #GstPipeline. It will notify the application of everything
* that's happening (errors, end of stream, tags found, state changes, etc.)
* by posting messages on its #GstBus. The application needs to watch the
* bus.
* </para>
* <para>
* Playback can be initiated by setting the element to PLAYING state using
* gst_element_set_state(). Note that the state change will take place in
* the background in a separate thread, when the function returns playback
* is probably not happening yet and any errors might not have occured yet.
* Applications using playbin should ideally be written to deal with things
* completely asynchroneous.
* </para>
* <para>
* When playback has finished (an EOS message has been received on the bus)
* or an error has occured (an ERROR message has been received on the bus) or
* the user wants to play a different track, playbin should be set back to
* READY or NULL state, then the "uri" property should be set to the new
* location and then playbin be set to PLAYING state again.
* </para>
* <para>
* Seeking can be done using gst_element_seek_simple() or gst_element_seek()
* on the playbin element. Again, the seek will not be executed
* instantaneously, but will be done in a background thread. When the seek
* call returns the seek will most likely still be in process. An application
* may wait for the seek to finish (or fail) using gst_element_get_state() with
* -1 as the timeout, but this will block the user interface and is not
* recommended at all.
* </para>
* <para>
* Applications may query the current position and duration of the stream
* via gst_element_query_position() and gst_element_query_duration() and
* setting the format passed to GST_FORMAT_TIME. If the query was successful,
* the duration or position will have been returned in units of nanoseconds.
* </para>
* <title>Advanced Usage: specifying the audio and video sink</title>
* <para>
* By default, if no audio sink or video sink has been specified via the
* "audio-sink" or "video-sink" property, playbin will use the autoaudiosink
* and autovideosink elements to find the first-best available output method.
* This should work in most cases, but is not always desirable. Often either
* the user or application might want to specify more explicitly what to use
* for audio and video output.
* </para>
* <para>
* If the application wants more control over how audio or video should be
* output, it may create the audio/video sink elements itself (for example
* using gst_element_factory_make()) and provide them to playbin using the
* "audio-sink" or "video-sink" property.
* </para>
* <para>
* GNOME-based applications, for example, will usually want to create
* gconfaudiosink and gconfvideosink elements and make playbin use those,
* so that output happens to whatever the user has configured in the GNOME
* Multimedia System Selector confinguration dialog.
* </para>
* <para>
* The sink elements do not necessarily need to be ready-made sinks. It is
* possible to create container elements that look like a sink to playbin,
* but in reality contain a number of custom elements linked together. This
* can be achieved by creating a #GstBin and putting elements in there and
* linking them, and then creating a sink #GstGhostPad for the bin and pointing
* it to the sink pad of the first element within the bin. This can be used
* for a number of purposes, for example to force output to a particular
* format or to modify or observe the data before it is output.
* </para>
* <para>
* It is also possible to 'suppress' audio and/or video output by using
* 'fakesink' elements (or capture it from there using the fakesink element's
* "handoff" signal, which, nota bene, is fired from the streaming thread!).
* </para>
* <title>Retrieving Tags and Other Meta Data</title>
* <para>
* Most of the common meta data (artist, title, etc.) can be retrieved by
* watching for TAG messages on the pipeline's bus (see above).
* </para>
* <para>
* Other more specific meta information like width/height/framerate of video
* streams or samplerate/number of channels of audio streams can be obtained
* using the "stream-info" property, which will return a GList of stream info
* objects, one for each stream. These are opaque objects that can only be
* accessed via the standard GObject property interface, ie. g_object_get().
* Each stream info object has the following properties:
* <itemizedlist>
* <listitem>"object" (GstObject) (the decoder source pad usually)</listitem>
* <listitem>"type" (enum) (if this is an audio/video/subtitle stream)</listitem>
* <listitem>"decoder" (string) (name of decoder used to decode this stream)</listitem>
* <listitem>"mute" (boolean) (to mute or unmute this stream)</listitem>
* <listitem>"caps" (GstCaps) (caps of the decoded stream)</listitem>
* <listitem>"language-code" (string) (ISO-639 language code for this stream, mostly used for audio/subtitle streams)</listitem>
* <listitem>"codec" (string) (format this stream was encoded in)</listitem>
* </itemizedlist>
* Stream information from the stream-info properties is best queried once
* playbin has changed into PAUSED or PLAYING state (which can be detected
* via a state-changed message on the bus where old_state=READY and
* new_state=PAUSED), since before that the list might not be complete yet or
* not contain all available information (like language-codes).
* </para>
* <title>Buffering</title>
* <para>
* Playbin handles buffering automatically for the most part, but applications
* need to handle parts of the buffering process as well. Whenever playbin is
* buffering, it will post BUFFERING messages on the bus with a percentage
* value that shows the progress of the buffering process. Applications need
* to set playbin to PLAYING or PAUSED state in response to these messages.
* They may also want to convey the buffering progress to the user in some
* way. Here is how to extract the percentage information from the message
* (requires GStreamer >= 0.10.11):
* </para>
* <para>
* <programlisting>
* switch (GST_MESSAGE_TYPE (msg)) {
* case GST_MESSAGE_BUFFERING: {
* gint percent = 0;
* gst_message_parse_buffering (msg, &amp;percent);
* g_print ("Buffering (%%u percent done)", percent);
* break;
* }
* ...
* }
* </programlisting>
* Note that applications should keep/set the pipeline in the PAUSED state when
* a BUFFERING message is received with a buffer percent value < 100 and set
* the pipeline back to PLAYING state when a BUFFERING message with a value
* of 100 percent is received (if PLAYING is the desired state, that is).
* </para>
* <title>Embedding the video window in your application</title>
* <para>
* By default, playbin (or rather the video sinks used) will create their own
* window. Applications will usually want to force output to a window of their
* own, however. This can be done using the GstXOverlay interface, which most
* video sinks implement. See the documentation there for more details.
* </para>
* <title>Specifying which CD/DVD device to use</title>
* <para>
* The device to use for CDs/DVDs needs to be set on the source element
* playbin creates before it is opened. The only way to do this at the moment
* is to connect to playbin's "notify::source" signal, which will be emitted
* by playbin when it has created the source element for a particular URI.
* In the signal callback you can check if the source element has a "device"
* property and set it appropriately. In future ways might be added to specify
* the device as part of the URI, but at the time of writing this is not
* possible yet.
* </para>
* <title>Examples</title>
* <para>
* Here is a simple pipeline to play back a video or audio file:
* <programlisting>
* gst-launch -v playbin uri=file:///path/to/somefile.avi
* </programlisting>
* This will play back the given AVI video file, given that the video and
* audio decoders required to decode the content are installed. Since no
* special audio sink or video sink is supplied (not possible via gst-launch),
* playbin will try to find a suitable audio and video sink automatically
* using the autoaudiosink and autovideosink elements.
* </para>
* <para>
* Here is a another pipeline to play track 4 of an audio CD:
* <programlisting>
* gst-launch -v playbin uri=cdda://4
* </programlisting>
* This will play back track 4 on an audio CD in your disc drive (assuming
* the drive is detected automatically by the plugin).
* </para>
* <para>
* Here is a another pipeline to play title 1 of a DVD:
* <programlisting>
* gst-launch -v playbin uri=dvd://1
* </programlisting>
* This will play back title 1 of a DVD in your disc drive (assuming
* the drive is detected automatically by the plugin).
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gst/gst-i18n-plugin.h>
#include <gst/utils/base-utils.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 10.0
#define CONNECTION_SPEED_DEFAULT 0
typedef struct _GstPlayBin GstPlayBin;
typedef struct _GstPlayBinClass GstPlayBinClass;
struct _GstPlayBin
{
GstPlayBaseBin parent;
/* the configurable elements */
GstElement *fakesink;
GstElement *audio_sink;
GstElement *video_sink;
GstElement *visualisation;
GstElement *pending_visualisation;
GstElement *volume_element;
GstElement *textoverlay_element;
gfloat volume;
/* these are the currently active sinks */
GList *sinks;
/* the last captured frame for snapshots */
GstBuffer *frame;
/* our cache for the sinks */
GHashTable *cache;
/* font description */
gchar *font_desc;
/* connection speed in bits/sec (0 = unknown) */
guint connection_speed;
/* indication if the pipeline is live */
gboolean is_live;
};
struct _GstPlayBinClass
{
GstPlayBaseBinClass parent_class;
};
/* props */
enum
{
ARG_0,
ARG_AUDIO_SINK,
ARG_VIDEO_SINK,
ARG_VIS_PLUGIN,
ARG_VOLUME,
ARG_FRAME,
ARG_FONT_DESC,
ARG_CONNECTION_SPEED
};
/* 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 gboolean setup_sinks (GstPlayBaseBin * play_base_bin,
GstPlayBaseGroup * group);
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 gboolean gst_play_bin_send_event (GstElement * element,
GstEvent * event);
static gboolean gst_play_bin_set_clock_func (GstElement * element,
GstClock * clock);
static GstStateChangeReturn gst_play_bin_change_state (GstElement * element,
GstStateChange transition);
static void gst_play_bin_handle_message (GstBin * bin, GstMessage * message);
static GstElementClass *parent_class;
//static guint gst_play_bin_signals[LAST_SIGNAL] = { 0 };
static const GstElementDetails gst_play_bin_details =
GST_ELEMENT_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_peek_parent (klass);
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 (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 (gobject_klass, ARG_FRAME,
gst_param_spec_mini_object ("frame", "Frame",
"The last frame (NULL = no video available)",
GST_TYPE_BUFFER, G_PARAM_READABLE));
g_object_class_install_property (gobject_klass, ARG_FONT_DESC,
g_param_spec_string ("subtitle-font-desc",
"Subtitle font description",
"Pango font description of font "
"to be used for subtitle rendering", NULL, G_PARAM_WRITABLE));
/**
* GstPlayBin::connection-speed
*
* Network connection speed in kbps (0 = unknown)
*
* Since: 0.10.10
**/
g_object_class_install_property (gobject_klass, ARG_CONNECTION_SPEED,
g_param_spec_uint ("connection-speed", "Connection Speed",
"Network connection speed in kbps (0 = unknown)",
0, G_MAXUINT, CONNECTION_SPEED_DEFAULT, G_PARAM_READWRITE));
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->send_event = GST_DEBUG_FUNCPTR (gst_play_bin_send_event);
gstelement_klass->set_clock = GST_DEBUG_FUNCPTR (gst_play_bin_set_clock_func);
gstbin_klass->handle_message =
GST_DEBUG_FUNCPTR (gst_play_bin_handle_message);
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->pending_visualisation = NULL;
play_bin->volume_element = NULL;
play_bin->textoverlay_element = NULL;
play_bin->volume = 1.0;
play_bin->sinks = NULL;
play_bin->frame = NULL;
play_bin->font_desc = NULL;
play_bin->cache = g_hash_table_new_full (g_str_hash, g_str_equal,
NULL, (GDestroyNotify) gst_object_unref);
}
static void
gst_play_bin_dispose (GObject * object)
{
GstPlayBin *play_bin;
play_bin = GST_PLAY_BIN (object);
if (play_bin->cache != NULL) {
remove_sinks (play_bin);
g_hash_table_destroy (play_bin->cache);
play_bin->cache = NULL;
}
if (play_bin->audio_sink != NULL) {
gst_element_set_state (play_bin->audio_sink, GST_STATE_NULL);
gst_object_unref (play_bin->audio_sink);
play_bin->audio_sink = NULL;
}
if (play_bin->video_sink != NULL) {
gst_element_set_state (play_bin->video_sink, GST_STATE_NULL);
gst_object_unref (play_bin->video_sink);
play_bin->video_sink = NULL;
}
if (play_bin->visualisation != NULL) {
gst_element_set_state (play_bin->visualisation, GST_STATE_NULL);
gst_object_unref (play_bin->visualisation);
play_bin->visualisation = NULL;
}
if (play_bin->pending_visualisation != NULL) {
gst_element_set_state (play_bin->pending_visualisation, GST_STATE_NULL);
gst_object_unref (play_bin->pending_visualisation);
play_bin->pending_visualisation = NULL;
}
if (play_bin->textoverlay_element != NULL) {
gst_object_unref (play_bin->textoverlay_element);
play_bin->textoverlay_element = NULL;
}
g_free (play_bin->font_desc);
play_bin->font_desc = NULL;
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_play_bin_vis_unblocked (GstPad * tee_pad, gboolean blocked,
gpointer user_data)
{
/* Unblocked */
}
static void
gst_play_bin_vis_blocked (GstPad * tee_pad, gboolean blocked,
gpointer user_data)
{
GstPlayBin *play_bin = GST_PLAY_BIN (user_data);
GstBin *vis_bin = NULL;
GstPad *vis_sink_pad = NULL, *vis_src_pad = NULL, *vqueue_pad = NULL;
GstState bin_state;
/* We want to disable visualisation */
if (!GST_IS_ELEMENT (play_bin->pending_visualisation)) {
/* Set visualisation element to READY */
gst_element_set_state (play_bin->visualisation, GST_STATE_READY);
goto beach;
}
vis_bin =
GST_BIN_CAST (gst_object_get_parent (GST_OBJECT_CAST (play_bin->
visualisation)));
if (!GST_IS_BIN (vis_bin) || !GST_IS_PAD (tee_pad)) {
goto beach;
}
vis_src_pad = gst_element_get_pad (play_bin->visualisation, "src");
vis_sink_pad = gst_pad_get_peer (tee_pad);
/* Can be fakesink */
if (GST_IS_PAD (vis_src_pad)) {
vqueue_pad = gst_pad_get_peer (vis_src_pad);
}
if (!GST_IS_PAD (vis_sink_pad)) {
goto beach;
}
/* Check the bin's state */
GST_OBJECT_LOCK (vis_bin);
bin_state = GST_STATE (vis_bin);
GST_OBJECT_UNLOCK (vis_bin);
/* Unlink */
gst_pad_unlink (tee_pad, vis_sink_pad);
gst_object_unref (vis_sink_pad);
vis_sink_pad = NULL;
if (GST_IS_PAD (vqueue_pad)) {
gst_pad_unlink (vis_src_pad, vqueue_pad);
gst_object_unref (vis_src_pad);
vis_src_pad = NULL;
}
/* Remove from vis_bin */
gst_bin_remove (vis_bin, play_bin->visualisation);
/* Set state to NULL */
gst_element_set_state (play_bin->visualisation, GST_STATE_NULL);
/* And loose our ref */
gst_object_unref (play_bin->visualisation);
if (play_bin->pending_visualisation) {
/* Ref this new visualisation element before adding to the bin */
gst_object_ref (play_bin->pending_visualisation);
/* Add the new one */
gst_bin_add (vis_bin, play_bin->pending_visualisation);
/* Synchronizing state */
gst_element_set_state (play_bin->pending_visualisation, bin_state);
vis_sink_pad = gst_element_get_pad (play_bin->pending_visualisation,
"sink");
vis_src_pad = gst_element_get_pad (play_bin->pending_visualisation, "src");
if (!GST_IS_PAD (vis_sink_pad) || !GST_IS_PAD (vis_src_pad)) {
goto beach;
}
/* Link */
gst_pad_link (tee_pad, vis_sink_pad);
gst_pad_link (vis_src_pad, vqueue_pad);
}
/* We are done */
gst_object_unref (play_bin->visualisation);
play_bin->visualisation = play_bin->pending_visualisation;
play_bin->pending_visualisation = NULL;
beach:
if (vis_sink_pad) {
gst_object_unref (vis_sink_pad);
}
if (vis_src_pad) {
gst_object_unref (vis_src_pad);
}
if (vqueue_pad) {
gst_object_unref (vqueue_pad);
}
if (vis_bin) {
gst_object_unref (vis_bin);
}
/* Unblock the pad */
gst_pad_set_blocked_async (tee_pad, FALSE, gst_play_bin_vis_unblocked,
play_bin);
}
static void
gst_play_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPlayBin *play_bin;
play_bin = GST_PLAY_BIN (object);
switch (prop_id) {
case ARG_VIDEO_SINK:
if (play_bin->video_sink != NULL) {
gst_object_unref (play_bin->video_sink);
}
play_bin->video_sink = g_value_get_object (value);
if (play_bin->video_sink != NULL) {
gst_object_ref (play_bin->video_sink);
gst_object_sink (GST_OBJECT_CAST (play_bin->video_sink));
}
/* 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:
if (play_bin->audio_sink != NULL) {
gst_object_unref (play_bin->audio_sink);
}
play_bin->audio_sink = g_value_get_object (value);
if (play_bin->audio_sink != NULL) {
gst_object_ref (play_bin->audio_sink);
gst_object_sink (GST_OBJECT_CAST (play_bin->audio_sink));
}
g_hash_table_remove (play_bin->cache, "abin");
break;
case ARG_VIS_PLUGIN:
{
/* Do we already have a visualisation change pending ? */
if (play_bin->pending_visualisation) {
gst_object_unref (play_bin->pending_visualisation);
play_bin->pending_visualisation = g_value_get_object (value);
/* Take ownership */
if (play_bin->pending_visualisation) {
gst_object_ref (play_bin->pending_visualisation);
gst_object_sink (GST_OBJECT_CAST (play_bin->pending_visualisation));
}
} else {
play_bin->pending_visualisation = g_value_get_object (value);
/* Take ownership */
if (play_bin->pending_visualisation) {
gst_object_ref (play_bin->pending_visualisation);
gst_object_sink (GST_OBJECT_CAST (play_bin->pending_visualisation));
}
/* Was there a visualisation already set ? */
if (play_bin->visualisation != NULL) {
GstBin *vis_bin = NULL;
vis_bin =
GST_BIN_CAST (gst_object_get_parent (GST_OBJECT_CAST (play_bin->
visualisation)));
/* Check if the visualisation is already in a bin */
if (GST_IS_BIN (vis_bin)) {
GstPad *vis_sink_pad = NULL, *tee_pad = NULL;
/* Now get tee pad and block it async */
vis_sink_pad = gst_element_get_pad (play_bin->visualisation,
"sink");
if (!GST_IS_PAD (vis_sink_pad)) {
goto beach;
}
tee_pad = gst_pad_get_peer (vis_sink_pad);
if (!GST_IS_PAD (tee_pad)) {
goto beach;
}
/* Block with callback */
gst_pad_set_blocked_async (tee_pad, TRUE, gst_play_bin_vis_blocked,
play_bin);
beach:
if (vis_sink_pad) {
gst_object_unref (vis_sink_pad);
}
if (tee_pad) {
gst_object_unref (tee_pad);
}
gst_object_unref (vis_bin);
} else {
play_bin->visualisation = play_bin->pending_visualisation;
play_bin->pending_visualisation = NULL;
}
} else {
play_bin->visualisation = play_bin->pending_visualisation;
play_bin->pending_visualisation = NULL;
}
}
break;
}
case ARG_VOLUME:
play_bin->volume = g_value_get_double (value);
if (play_bin->volume_element) {
g_object_set (G_OBJECT (play_bin->volume_element), "volume",
play_bin->volume, NULL);
}
break;
case ARG_FONT_DESC:
g_free (play_bin->font_desc);
play_bin->font_desc = g_strdup (g_value_get_string (value));
if (play_bin->textoverlay_element) {
g_object_set (G_OBJECT (play_bin->textoverlay_element),
"font-desc", g_value_get_string (value), NULL);
}
break;
case ARG_CONNECTION_SPEED:
play_bin->connection_speed = g_value_get_uint (value) * 1000;
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;
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:{
GstBuffer *cur_frame = NULL;
gst_buffer_replace (&cur_frame, play_bin->frame);
gst_value_take_buffer (value, cur_frame);
break;
}
case ARG_CONNECTION_SPEED:
g_value_set_uint (value, play_bin->connection_speed / 1000);
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);
/* applications need to know the buffer caps,
* make sure they are always set on the frame */
if (GST_BUFFER_CAPS (frame) == NULL) {
GstPad *pad;
if ((pad = gst_element_get_pad (identity, "sink"))) {
gst_buffer_set_caps (frame, GST_PAD_CAPS (pad));
gst_object_unref (pad);
}
}
gst_buffer_replace (&play_bin->frame, frame);
}
static void
post_missing_element_message (GstPlayBin * playbin, const gchar * name)
{
GstMessage *msg;
msg = gst_missing_element_message_new (GST_ELEMENT_CAST (playbin), name);
gst_element_post_message (GST_ELEMENT_CAST (playbin), msg);
}
/* 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;
GstPad *pad;
/* first see if we have it in the cache */
element = g_hash_table_lookup (play_bin->cache, "vbin");
if (element != NULL) {
return element;
}
if (play_bin->video_sink) {
sink = play_bin->video_sink;
} else {
sink = gst_element_factory_make ("autovideosink", "videosink");
if (sink == NULL) {
sink = gst_element_factory_make ("xvimagesink", "videosink");
}
if (sink == NULL)
goto no_sinks;
}
gst_object_ref (sink);
g_hash_table_insert (play_bin->cache, "video_sink", sink);
/* create a bin to hold objects, as we create them we add them to this bin so
* that when something goes wrong we only need to unref the bin */
element = gst_bin_new ("vbin");
gst_bin_add (GST_BIN_CAST (element), sink);
conv = gst_element_factory_make ("ffmpegcolorspace", "vconv");
if (conv == NULL)
goto no_colorspace;
gst_bin_add (GST_BIN_CAST (element), conv);
scale = gst_element_factory_make ("videoscale", "vscale");
if (scale == NULL)
goto no_videoscale;
gst_bin_add (GST_BIN_CAST (element), scale);
identity = gst_element_factory_make ("identity", "id");
g_object_set (identity, "silent", TRUE, NULL);
g_signal_connect (identity, "handoff", G_CALLBACK (handoff), play_bin);
gst_bin_add (GST_BIN_CAST (element), identity);
gst_element_link_pads (identity, "src", conv, "sink");
gst_element_link_pads (conv, "src", scale, "sink");
/* be more careful with the pad from the custom sink element, it might not
* be named 'sink' */
if (!gst_element_link_pads (scale, "src", sink, NULL))
goto link_failed;
pad = gst_element_get_pad (identity, "sink");
gst_element_add_pad (element, gst_ghost_pad_new ("sink", pad));
gst_object_unref (pad);
gst_element_set_state (element, GST_STATE_READY);
/* since we're gonna add it to a bin but don't want to lose it,
* we keep a reference. */
gst_object_ref (element);
g_hash_table_insert (play_bin->cache, "vbin", element);
return element;
/* ERRORS */
no_sinks:
{
post_missing_element_message (play_bin, "autovideosink");
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Both autovideosink and xvimagesink elements are missing.")),
(NULL));
return NULL;
}
no_colorspace:
{
post_missing_element_message (play_bin, "ffmpegcolorspace");
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Missing element '%s' - check your GStreamer installation."),
"ffmpegcolorspace"), (NULL));
gst_object_unref (element);
return NULL;
}
no_videoscale:
{
post_missing_element_message (play_bin, "videoscale");
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Missing element '%s' - check your GStreamer installation."),
"videoscale"), ("possibly a liboil version mismatch?"));
gst_object_unref (element);
return NULL;
}
link_failed:
{
GST_ELEMENT_ERROR (play_bin, CORE, PAD,
(NULL), ("Failed to configure the video sink."));
gst_object_unref (element);
return NULL;
}
}
/* make an element for playback of video with subtitles embedded.
*
* +--------------------------------------------------+
* | tbin +-------------+ |
* | +-----+ | textoverlay | +------+ |
* | | csp | +--video_sink | | vbin | |
* video_sink-sink src+ +-text_sink src-sink | |
* | +-----+ | +-------------+ +------+ |
* text_sink-------------+ |
* +--------------------------------------------------+
*
* If there is no subtitle renderer this function will simply return the
* videosink without the text_sink pad.
*/
static GstElement *
gen_text_element (GstPlayBin * play_bin)
{
GstElement *element, *csp, *overlay, *vbin;
GstPad *pad;
/* Create the video rendering bin, error is posted when this fails. */
vbin = gen_video_element (play_bin);
if (!vbin)
return NULL;
/* Text overlay */
overlay = gst_element_factory_make ("textoverlay", "overlay");
/* If no overlay return the video bin without subtitle support. */
if (!overlay)
goto no_overlay;
/* Create our bin */
element = gst_bin_new ("textbin");
/* Set some parameters */
g_object_set (G_OBJECT (overlay),
"halign", "center", "valign", "bottom", NULL);
if (play_bin->font_desc) {
g_object_set (G_OBJECT (overlay), "font-desc", play_bin->font_desc, NULL);
}
/* Take a ref */
play_bin->textoverlay_element = GST_ELEMENT_CAST (gst_object_ref (overlay));
/* we know this will succeed, as the video bin already created one before */
csp = gst_element_factory_make ("ffmpegcolorspace", "subtitlecsp");
/* Add our elements */
gst_bin_add_many (GST_BIN_CAST (element), csp, overlay, vbin, NULL);
/* Link */
gst_element_link_pads (csp, "src", overlay, "video_sink");
gst_element_link_pads (overlay, "src", vbin, "sink");
/* Add ghost pads on the subtitle bin */
pad = gst_element_get_pad (overlay, "text_sink");
gst_element_add_pad (element, gst_ghost_pad_new ("text_sink", pad));
gst_object_unref (pad);
pad = gst_element_get_pad (csp, "sink");
gst_element_add_pad (element, gst_ghost_pad_new ("sink", pad));
gst_object_unref (pad);
/* Set state to READY */
gst_element_set_state (element, GST_STATE_READY);
return element;
/* ERRORS */
no_overlay:
{
post_missing_element_message (play_bin, "textoverlay");
GST_WARNING_OBJECT (play_bin,
"No overlay (pango) element, subtitles disabled");
return vbin;
}
}
/* 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)
{
gboolean res;
GstElement *element;
GstElement *conv;
GstElement *scale;
GstElement *sink;
GstElement *volume;
GstPad *pad;
element = g_hash_table_lookup (play_bin->cache, "abin");
if (element != NULL)
return element;
if (play_bin->audio_sink) {
sink = play_bin->audio_sink;
} else {
sink = gst_element_factory_make ("autoaudiosink", "audiosink");
if (sink == NULL) {
sink = gst_element_factory_make ("alsasink", "audiosink");
}
if (sink == NULL)
goto no_sinks;
play_bin->audio_sink = GST_ELEMENT_CAST (gst_object_ref (sink));
}
gst_object_ref (sink);
g_hash_table_insert (play_bin->cache, "audio_sink", sink);
element = gst_bin_new ("abin");
gst_bin_add (GST_BIN_CAST (element), sink);
conv = gst_element_factory_make ("audioconvert", "aconv");
if (conv == NULL)
goto no_audioconvert;
gst_bin_add (GST_BIN_CAST (element), conv);
scale = gst_element_factory_make ("audioresample", "aresample");
if (scale == NULL)
goto no_audioresample;
gst_bin_add (GST_BIN_CAST (element), scale);
volume = gst_element_factory_make ("volume", "volume");
g_object_set (G_OBJECT (volume), "volume", play_bin->volume, NULL);
play_bin->volume_element = volume;
gst_bin_add (GST_BIN_CAST (element), volume);
res = gst_element_link_pads (conv, "src", scale, "sink");
res &= gst_element_link_pads (scale, "src", volume, "sink");
res &= gst_element_link_pads (volume, "src", sink, NULL);
if (!res)
goto link_failed;
pad = gst_element_get_pad (conv, "sink");
gst_element_add_pad (element, gst_ghost_pad_new ("sink", pad));
gst_object_unref (pad);
gst_element_set_state (element, GST_STATE_READY);
/* since we're gonna add it to a bin but don't want to lose it,
* we keep a reference. */
gst_object_ref (element);
g_hash_table_insert (play_bin->cache, "abin", element);
return element;
/* ERRORS */
no_sinks:
{
post_missing_element_message (play_bin, "autoaudiosink");
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Both autoaudiosink and alsasink elements are missing.")), (NULL));
return NULL;
}
no_audioconvert:
{
post_missing_element_message (play_bin, "audioconvert");
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Missing element '%s' - check your GStreamer installation."),
"audioconvert"), ("possibly a liboil version mismatch?"));
gst_object_unref (element);
return NULL;
}
no_audioresample:
{
post_missing_element_message (play_bin, "audioresample");
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Missing element '%s' - check your GStreamer installation."),
"audioresample"), ("possibly a liboil version mismatch?"));
gst_object_unref (element);
return NULL;
}
link_failed:
{
GST_ELEMENT_ERROR (play_bin, CORE, PAD,
(NULL), ("Failed to configure the audio sink."));
gst_object_unref (element);
return NULL;
}
}
/* 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 | | aqueue | | abin ... | |
* | +-sink src-sink src-sink | |
* | | | | +--------+ +----------------+ |
* | | | | |
* | | | | +------+ +------------+ +------+ +-----------+ |
* | | | | |vqueue| | audioconv | | vis | | vbin ... | |
* | | | src-sink src-sink + samp src-sink src-sink | |
* | | | | +------+ +------------+ +------+ +-----------+ |
* | | | | |
* | | +------+ |
* sink-+ |
+------------------------------------------------------------------------+
*/
static GstElement *
gen_vis_element (GstPlayBin * play_bin)
{
gboolean res;
GstElement *element;
GstElement *tee;
GstElement *asink;
GstElement *vsink;
GstElement *conv;
GstElement *resamp;
GstElement *conv2;
GstElement *vis;
GstElement *vqueue, *aqueue;
GstPad *pad, *rpad;
/* errors are already posted when these fail. */
asink = gen_audio_element (play_bin);
if (!asink)
return NULL;
vsink = gen_video_element (play_bin);
if (!vsink) {
gst_object_unref (asink);
return NULL;
}
element = gst_bin_new ("visbin");
tee = gst_element_factory_make ("tee", "tee");
vqueue = gst_element_factory_make ("queue", "vqueue");
aqueue = gst_element_factory_make ("queue", "aqueue");
gst_bin_add (GST_BIN_CAST (element), asink);
gst_bin_add (GST_BIN_CAST (element), vqueue);
gst_bin_add (GST_BIN_CAST (element), aqueue);
gst_bin_add (GST_BIN_CAST (element), vsink);
gst_bin_add (GST_BIN_CAST (element), tee);
conv = gst_element_factory_make ("audioconvert", "aconv");
if (conv == NULL)
goto no_audioconvert;
gst_bin_add (GST_BIN_CAST (element), conv);
resamp = gst_element_factory_make ("audioresample", "aresamp");
if (resamp == NULL)
goto no_audioresample;
gst_bin_add (GST_BIN_CAST (element), resamp);
conv2 = gst_element_factory_make ("audioconvert", "aconv2");
if (conv2 == NULL)
goto no_audioconvert;
gst_bin_add (GST_BIN_CAST (element), conv2);
if (play_bin->visualisation) {
gst_object_ref (play_bin->visualisation);
vis = play_bin->visualisation;
} else {
vis = gst_element_factory_make ("goom", "vis");
if (!vis)
goto no_goom;
}
gst_bin_add (GST_BIN_CAST (element), vis);
res = gst_element_link_pads (vqueue, "src", conv, "sink");
res &= gst_element_link_pads (conv, "src", resamp, "sink");
res &= gst_element_link_pads (resamp, "src", conv2, "sink");
res &= gst_element_link_pads (conv2, "src", vis, "sink");
res &= gst_element_link_pads (vis, "src", vsink, "sink");
if (!res)
goto link_failed;
pad = gst_element_get_pad (aqueue, "sink");
rpad = gst_element_get_request_pad (tee, "src%d");
gst_pad_link (rpad, pad);
gst_object_unref (rpad);
gst_object_unref (pad);
gst_element_link_pads (aqueue, "src", asink, "sink");
pad = gst_element_get_pad (vqueue, "sink");
rpad = gst_element_get_request_pad (tee, "src%d");
gst_pad_link (rpad, pad);
gst_object_unref (rpad);
gst_object_unref (pad);
pad = gst_element_get_pad (tee, "sink");
gst_element_add_pad (element, gst_ghost_pad_new ("sink", pad));
gst_object_unref (pad);
return element;
/* ERRORS */
no_audioconvert:
{
post_missing_element_message (play_bin, "audioconvert");
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Missing element '%s' - check your GStreamer installation."),
"audioconvert"), ("possibly a liboil version mismatch?"));
gst_object_unref (element);
return NULL;
}
no_audioresample:
{
post_missing_element_message (play_bin, "audioresample");
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Missing element '%s' - check your GStreamer installation."),
"audioresample"), (NULL));
gst_object_unref (element);
return NULL;
}
no_goom:
{
post_missing_element_message (play_bin, "goom");
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Missing element '%s' - check your GStreamer installation."),
"goom"), (NULL));
gst_object_unref (element);
return NULL;
}
link_failed:
{
GST_ELEMENT_ERROR (play_bin, CORE, PAD,
(NULL), ("Failed to configure the visualisation element."));
gst_object_unref (element);
return NULL;
}
}
/* get rid of all installed sinks */
static void
remove_sinks (GstPlayBin * play_bin)
{
GList *sinks;
GstObject *parent;
GstElement *element;
GstPad *pad, *peer;
if (play_bin->cache == NULL)
return;
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 */
play_bin->sinks = g_list_remove (play_bin->sinks, element);
gst_element_set_state (element, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (parent), element);
gst_object_unref (parent);
}
pad = gst_element_get_pad (element, "sink");
if (pad != NULL) {
peer = gst_pad_get_peer (pad);
if (peer != NULL) {
gst_pad_unlink (peer, pad);
gst_object_unref (peer);
}
gst_object_unref (pad);
}
}
element = g_hash_table_lookup (play_bin->cache, "vbin");
if (element != NULL) {
parent = gst_element_get_parent (element);
if (parent != NULL) {
play_bin->sinks = g_list_remove (play_bin->sinks, element);
gst_element_set_state (element, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (parent), element);
gst_object_unref (parent);
}
pad = gst_element_get_pad (element, "sink");
if (pad != NULL) {
peer = gst_pad_get_peer (pad);
if (peer != NULL) {
gst_pad_unlink (peer, pad);
gst_object_unref (peer);
}
gst_object_unref (pad);
}
}
for (sinks = play_bin->sinks; sinks; sinks = g_list_next (sinks)) {
GstElement *element = GST_ELEMENT_CAST (sinks->data);
GstPad *pad;
GstPad *peer;
pad = gst_element_get_pad (element, "sink");
GST_LOG ("removing sink %p", element);
peer = gst_pad_get_peer (pad);
if (peer) {
gst_pad_unlink (peer, pad);
gst_object_unref (peer);
}
gst_object_unref (pad);
gst_element_set_state (element, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (play_bin), element);
}
g_list_free (play_bin->sinks);
play_bin->sinks = NULL;
if (play_bin->visualisation) {
GstElement *vis_bin;
vis_bin =
GST_ELEMENT_CAST (gst_element_get_parent (play_bin->visualisation));
gst_element_set_state (play_bin->visualisation, GST_STATE_NULL);
if (vis_bin) {
gst_bin_remove (GST_BIN_CAST (vis_bin), play_bin->visualisation);
gst_object_unref (vis_bin);
}
}
if (play_bin->frame) {
gst_buffer_unref (play_bin->frame);
play_bin->frame = NULL;
}
if (play_bin->textoverlay_element) {
gst_object_unref (play_bin->textoverlay_element);
play_bin->textoverlay_element = 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.
*
* This function takes ownership of @sink.*
*/
static gboolean
add_sink (GstPlayBin * play_bin, GstElement * sink, GstPad * srcpad,
GstPad * subtitle_pad)
{
GstPad *sinkpad;
GstPadLinkReturn linkres;
GstElement *parent;
GstStateChangeReturn stateret;
GstState state;
g_return_val_if_fail (sink != NULL, FALSE);
/* For live pipelines we need to add the bin in the same state as the
* parent so that it starts as soon as it is prerolled. */
if (play_bin->is_live)
state = GST_STATE_PLAYING;
else
state = GST_STATE_PAUSED;
/* this is only for debugging */
parent = gst_pad_get_parent_element (srcpad);
if (parent) {
GST_DEBUG ("Adding sink with state %d (parent: %d, peer: %d)",
GST_STATE (sink), GST_STATE (play_bin), GST_STATE (parent));
gst_object_unref (parent);
}
gst_bin_add (GST_BIN_CAST (play_bin), sink);
/* for live pipelines, disable the sync in the sinks until core handles this
* correctly. */
if (play_bin->is_live)
gst_element_set_clock (sink, NULL);
/* bring it to the PAUSED state so we can link to the peer without
* breaking the flow */
stateret = gst_element_set_state (sink, state);
if (stateret == GST_STATE_CHANGE_FAILURE)
goto state_failed;
/* we found a sink for this stream, now try to install it */
sinkpad = gst_element_get_pad (sink, "sink");
linkres = gst_pad_link (srcpad, sinkpad);
gst_object_unref (sinkpad);
/* try to link the pad of the sink to the stream */
if (GST_PAD_LINK_FAILED (linkres))
goto link_failed;
if (GST_IS_PAD (subtitle_pad)) {
sinkpad = gst_element_get_pad (sink, "text_sink");
linkres = gst_pad_link (subtitle_pad, sinkpad);
gst_object_unref (sinkpad);
}
/* try to link the subtitle pad of the sink to the stream, this is not
* fatal. */
if (GST_PAD_LINK_FAILED (linkres))
goto subtitle_failed;
done:
/* we got the sink succesfully linked, now keep the sink
* in our internal list */
play_bin->sinks = g_list_prepend (play_bin->sinks, sink);
return TRUE;
/* ERRORS */
state_failed:
{
gst_element_set_state (sink, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (play_bin), sink);
GST_DEBUG_OBJECT (play_bin, "state change failure when adding sink");
return FALSE;
}
link_failed:
{
gchar *capsstr;
GstCaps *caps;
/* could not link this stream */
caps = gst_pad_get_caps (srcpad);
capsstr = gst_caps_to_string (caps);
g_warning ("could not link %s: %d", capsstr, linkres);
GST_DEBUG_OBJECT (play_bin,
"link failed when adding sink, caps %s, reason %d", capsstr, linkres);
g_free (capsstr);
gst_caps_unref (caps);
gst_element_set_state (sink, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (play_bin), sink);
return FALSE;
}
subtitle_failed:
{
gchar *capsstr;
GstCaps *caps;
/* could not link this stream */
caps = gst_pad_get_caps (subtitle_pad);
capsstr = gst_caps_to_string (caps);
GST_DEBUG_OBJECT (play_bin,
"subtitle link failed when adding sink, caps %s, reason %d", capsstr,
linkres);
g_free (capsstr);
gst_caps_unref (caps);
/* not fatal */
goto done;
}
}
static gboolean
setup_sinks (GstPlayBaseBin * play_base_bin, GstPlayBaseGroup * group)
{
GstPlayBin *play_bin = GST_PLAY_BIN (play_base_bin);
GList *streaminfo = NULL, *s;
gboolean need_vis = FALSE;
gboolean need_text = FALSE;
GstPad *textsrcpad = NULL, *pad = NULL;
GstElement *sink;
gboolean res = TRUE;
/* get rid of existing sinks */
if (play_bin->sinks) {
remove_sinks (play_bin);
}
GST_DEBUG_OBJECT (play_base_bin, "setupsinks");
/* find out what to do */
if (group->type[GST_STREAM_TYPE_VIDEO - 1].npads > 0 &&
group->type[GST_STREAM_TYPE_TEXT - 1].npads > 0) {
need_text = TRUE;
} else if (group->type[GST_STREAM_TYPE_VIDEO - 1].npads == 0 &&
group->type[GST_STREAM_TYPE_AUDIO - 1].npads > 0 &&
play_bin->visualisation != NULL) {
need_vis = TRUE;
}
/* now actually connect everything */
g_object_get (G_OBJECT (play_base_bin), "stream-info", &streaminfo, NULL);
for (s = streaminfo; s; s = g_list_next (s)) {
GObject *obj = G_OBJECT (s->data);
gint type;
GstObject *object;
g_object_get (obj, "type", &type, NULL);
g_object_get (obj, "object", &object, NULL);
}
/* link audio */
if (group->type[GST_STREAM_TYPE_AUDIO - 1].npads > 0) {
if (need_vis) {
sink = gen_vis_element (play_bin);
} else {
sink = gen_audio_element (play_bin);
}
if (!sink)
return FALSE;
pad = gst_element_get_pad (group->type[GST_STREAM_TYPE_AUDIO - 1].preroll,
"src");
res = add_sink (play_bin, sink, pad, NULL);
gst_object_unref (pad);
}
/* link video */
if (group->type[GST_STREAM_TYPE_VIDEO - 1].npads > 0) {
if (need_text) {
GstObject *parent = NULL, *grandparent = NULL;
GstPad *ghost = NULL;
sink = gen_text_element (play_bin);
textsrcpad =
gst_element_get_pad (group->type[GST_STREAM_TYPE_TEXT - 1].preroll,
"src");
/* This pad is from subtitle-bin, we need to create a ghost pad to have
common grandparents */
parent = gst_object_get_parent (GST_OBJECT_CAST (textsrcpad));
if (!parent) {
GST_WARNING_OBJECT (textsrcpad, "subtitle pad has no parent !");
gst_object_unref (textsrcpad);
textsrcpad = NULL;
goto beach;
}
grandparent = gst_object_get_parent (parent);
if (!grandparent) {
GST_WARNING_OBJECT (textsrcpad, "subtitle pad has no grandparent !");
gst_object_unref (parent);
gst_object_unref (textsrcpad);
textsrcpad = NULL;
goto beach;
}
/* We ghost the pad on subtitle_bin only, if the text pad is from the
media demuxer we keep it as it is */
if (!GST_IS_PLAY_BIN (grandparent)) {
GST_DEBUG_OBJECT (textsrcpad, "this subtitle pad is from a subtitle "
"file, ghosting to a suitable hierarchy");
ghost = gst_ghost_pad_new ("text_src", textsrcpad);
if (!GST_IS_PAD (ghost)) {
GST_WARNING_OBJECT (textsrcpad, "failed creating ghost pad for "
"subtitle-bin");
gst_object_unref (parent);
gst_object_unref (grandparent);
gst_object_unref (textsrcpad);
textsrcpad = NULL;
goto beach;
}
gst_pad_set_active (ghost, TRUE);
if (gst_element_add_pad (GST_ELEMENT_CAST (grandparent), ghost)) {
gst_object_unref (textsrcpad);
textsrcpad = gst_object_ref (ghost);
} else {
GST_WARNING_OBJECT (ghost, "failed adding ghost pad on subtitle-bin");
gst_pad_set_active (ghost, FALSE);
gst_object_unref (ghost);
gst_object_unref (textsrcpad);
textsrcpad = NULL;
}
} else {
GST_DEBUG_OBJECT (textsrcpad, "this subtitle pad is from the demuxer "
"no changes to hierarchy needed");
}
gst_object_unref (parent);
gst_object_unref (grandparent);
} else {
sink = gen_video_element (play_bin);
}
beach:
if (!sink)
return FALSE;
pad = gst_element_get_pad (group->type[GST_STREAM_TYPE_VIDEO - 1].preroll,
"src");
res = add_sink (play_bin, sink, pad, textsrcpad);
gst_object_unref (pad);
if (textsrcpad)
gst_object_unref (textsrcpad);
}
/* remove the sinks now, pipeline get_state will now wait for the
* sinks to preroll */
if (play_bin->fakesink) {
gst_element_set_state (play_bin->fakesink, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (play_bin), play_bin->fakesink);
play_bin->fakesink = NULL;
}
return res;
}
/* Send an event to our sinks until one of them works; don't then send to the
* remaining sinks (unlike GstBin)
*/
static gboolean
gst_play_bin_send_event_to_sink (GstPlayBin * play_bin, GstEvent * event)
{
GList *sinks = play_bin->sinks;
gboolean res = TRUE;
while (sinks) {
GstElement *sink = GST_ELEMENT_CAST (sinks->data);
gst_event_ref (event);
if ((res = gst_element_send_event (sink, event))) {
GST_DEBUG_OBJECT (play_bin,
"Sent event succesfully to sink %" GST_PTR_FORMAT, sink);
break;
}
GST_DEBUG_OBJECT (play_bin,
"Event failed when sent to sink %" GST_PTR_FORMAT, sink);
sinks = g_list_next (sinks);
}
gst_event_unref (event);
return res;
}
static gboolean
do_playbin_seek (GstElement * element, GstEvent * event)
{
gdouble rate;
GstSeekFlags flags;
gboolean flush;
gboolean was_playing = FALSE;
gboolean res;
gst_event_parse_seek (event, &rate, NULL, &flags, NULL, NULL, NULL, NULL);
flush = flags & GST_SEEK_FLAG_FLUSH;
if (flush) {
GstState state;
/* need to call _get_state() since a bin state is only updated
* with this call. */
gst_element_get_state (element, &state, NULL, 0);
was_playing = state == GST_STATE_PLAYING;
if (was_playing) {
gst_element_set_state (element, GST_STATE_PAUSED);
gst_element_get_state (element, NULL, NULL, 50 * GST_MSECOND);
}
}
GST_DEBUG_OBJECT (element, "Sending seek event to a sink");
res = gst_play_bin_send_event_to_sink (GST_PLAY_BIN (element), event);
if (flush) {
/* need to reset the stream time to 0 after a flushing seek */
if (res)
gst_pipeline_set_new_stream_time (GST_PIPELINE (element), 0);
if (was_playing)
/* and continue playing */
gst_element_set_state (element, GST_STATE_PLAYING);
}
return res;
}
/* We only want to send the event to a single sink (overriding GstBin's
* behaviour), but we want to keep GstPipeline's behaviour - wrapping seek
* events appropriately. So, this is a messy duplication of code. */
static gboolean
gst_play_bin_send_event (GstElement * element, GstEvent * event)
{
gboolean res = FALSE;
GstEventType event_type = GST_EVENT_TYPE (event);
switch (event_type) {
case GST_EVENT_SEEK:
res = do_playbin_seek (element, event);
break;
default:
res = gst_play_bin_send_event_to_sink (GST_PLAY_BIN (element), event);
break;
}
return res;
}
/* Override the set_clock function, we don't want to set a clock on the sinks
* when we are live pipeline so that they don't synchronize until this is
* fixed in core. */
static gboolean
gst_play_bin_set_clock_func (GstElement * element, GstClock * clock)
{
GList *children;
GstBin *bin;
GstPlayBin *play_bin;
gboolean res = TRUE;
GstElement *asink, *vsink;
bin = GST_BIN (element);
play_bin = GST_PLAY_BIN (element);
asink = g_hash_table_lookup (play_bin->cache, "audio_sink");
vsink = g_hash_table_lookup (play_bin->cache, "video_sink");
GST_DEBUG_OBJECT (play_bin, "setting clock, is_live %d", play_bin->is_live);
GST_OBJECT_LOCK (bin);
if (element->clock != clock) {
for (children = bin->children; children; children = g_list_next (children)) {
GstElement *child = GST_ELEMENT (children->data);
if (play_bin->is_live && (child == asink || child == vsink))
res &= gst_element_set_clock (child, NULL);
else
res &= gst_element_set_clock (child, clock);
}
}
GST_OBJECT_UNLOCK (bin);
return res;
}
static void
value_list_append_structure_list (GValue * list_val, GstStructure ** first,
GList * structure_list)
{
GList *l;
for (l = structure_list; l != NULL; l = l->next) {
GValue val = { 0, };
if (*first == NULL)
*first = gst_structure_copy ((GstStructure *) l->data);
g_value_init (&val, GST_TYPE_STRUCTURE);
g_value_take_boxed (&val, gst_structure_copy ((GstStructure *) l->data));
gst_value_list_append_value (list_val, &val);
g_value_unset (&val);
}
}
/* if it's a redirect message with multiple redirect locations we might
* want to pick a different 'best' location depending on the required
* bitrates and the connection speed */
static GstMessage *
gst_play_bin_handle_redirect_message (GstPlayBin * playbin, GstMessage * msg)
{
const GValue *locations_list, *location_val;
GstMessage *new_msg;
GstStructure *new_structure = NULL;
GList *l_good = NULL, *l_neutral = NULL, *l_bad = NULL;
GValue new_list = { 0, };
guint size, i;
GST_DEBUG_OBJECT (playbin, "redirect message: %" GST_PTR_FORMAT, msg);
GST_DEBUG_OBJECT (playbin, "connection speed: %u", playbin->connection_speed);
if (playbin->connection_speed == 0 || msg->structure == NULL)
return msg;
locations_list = gst_structure_get_value (msg->structure, "locations");
if (locations_list == NULL)
return msg;
size = gst_value_list_get_size (locations_list);
if (size < 2)
return msg;
/* maintain existing order as much as possible, just sort references
* with too high a bitrate to the end (the assumption being that if
* bitrates are given they are given for all interesting streams and
* that the you-need-at-least-version-xyz redirect has the same bitrate
* as the lowest referenced redirect alternative) */
for (i = 0; i < size; ++i) {
const GstStructure *s;
gint bitrate = 0;
location_val = gst_value_list_get_value (locations_list, i);
s = (const GstStructure *) g_value_get_boxed (location_val);
if (!gst_structure_get_int (s, "minimum-bitrate", &bitrate) || bitrate <= 0) {
GST_DEBUG_OBJECT (playbin, "no bitrate: %" GST_PTR_FORMAT, s);
l_neutral = g_list_append (l_neutral, (gpointer) s);
} else if (bitrate > playbin->connection_speed) {
GST_DEBUG_OBJECT (playbin, "bitrate too high: %" GST_PTR_FORMAT, s);
l_bad = g_list_append (l_bad, (gpointer) s);
} else if (bitrate <= playbin->connection_speed) {
GST_DEBUG_OBJECT (playbin, "bitrate OK: %" GST_PTR_FORMAT, s);
l_good = g_list_append (l_good, (gpointer) s);
}
}
g_value_init (&new_list, GST_TYPE_LIST);
value_list_append_structure_list (&new_list, &new_structure, l_good);
value_list_append_structure_list (&new_list, &new_structure, l_neutral);
value_list_append_structure_list (&new_list, &new_structure, l_bad);
gst_structure_set_value (new_structure, "locations", &new_list);
g_value_unset (&new_list);
g_list_free (l_good);
g_list_free (l_neutral);
g_list_free (l_bad);
new_msg = gst_message_new_element (msg->src, new_structure);
gst_message_unref (msg);
GST_DEBUG_OBJECT (playbin, "new redirect message: %" GST_PTR_FORMAT, new_msg);
return new_msg;
}
static void
gst_play_bin_handle_message (GstBin * bin, GstMessage * msg)
{
if (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_ELEMENT && msg->structure != NULL
&& gst_structure_has_name (msg->structure, "redirect")) {
msg = gst_play_bin_handle_redirect_message (GST_PLAY_BIN (bin), msg);
}
GST_BIN_CLASS (parent_class)->handle_message (bin, msg);
}
static GstStateChangeReturn
gst_play_bin_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstPlayBin *play_bin;
play_bin = GST_PLAY_BIN (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* this really is the easiest way to make the state change return
* ASYNC until we added the sinks */
if (!play_bin->fakesink) {
play_bin->fakesink = gst_element_factory_make ("fakesink", "test");
gst_bin_add (GST_BIN_CAST (play_bin), play_bin->fakesink);
}
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* remember us being a live pipeline */
play_bin->is_live = (ret == GST_STATE_CHANGE_NO_PREROLL);
GST_DEBUG_OBJECT (play_bin, "is live: %d", play_bin->is_live);
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
/* FIXME Release audio device when we implement that */
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
/* remove sinks we added */
remove_sinks (play_bin);
/* and there might be a fakesink we need to clean up now */
if (play_bin->fakesink) {
gst_element_set_state (play_bin->fakesink, GST_STATE_NULL);
gst_bin_remove (GST_BIN_CAST (play_bin), play_bin->fakesink);
play_bin->fakesink = NULL;
}
break;
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_play_bin_debug, "playbin", 0, "play bin");
gst_base_utils_init ();
#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, "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_NAME,
GST_PACKAGE_ORIGIN)
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