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gstreamer/gst/playback/gstplaybin.c
Julien Moutte 950ab0ef96 gst/playback/: Implement subtitles. 
Original commit message from CVS:
2006-01-30  Julien MOUTTE  <julien@moutte.net>

* gst/playback/gstplaybasebin.c: (group_commit),
(queue_overrun),
(setup_subtitle), (setup_source), (set_active_source):
* gst/playback/gstplaybin.c: (gst_play_bin_dispose),
(gen_text_element), (gen_audio_element), (gen_vis_element),
(remove_sinks), (add_sink), (setup_sinks): Implement subtitles.
2006-01-30 08:11:14 +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 <gst/gst-i18n-plugin.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
#ifndef GST_HAVE_GLIB_2_8
#define _gst_gvalue_set_gstobject(gvalue,obj) \
if (obj != NULL) { \
gst_object_ref (obj); \
g_value_set_object (gvalue, obj); \
g_object_unref (obj); \
} else { \
g_value_set_object (gvalue, NULL); \
}
#else
#define _gst_gvalue_set_gstobject(gvalue,obj) \
g_value_set_object (gvalue, obj);
#endif
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;
};
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
};
/* 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 GstStateChangeReturn gst_play_bin_change_state (GstElement * element,
GstStateChange transition);
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 (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));
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);
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 (gst_object_get_parent (GST_OBJECT (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;
g_return_if_fail (GST_IS_PLAY_BIN (object));
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 (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 (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 (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 (play_bin->pending_visualisation));
}
/* Was there a visualisation already set ? */
if (play_bin->visualisation != NULL) {
GstBin *vis_bin = NULL;
vis_bin =
GST_BIN (gst_object_get_parent (GST_OBJECT (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;
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:
_gst_gvalue_set_gstobject (value, play_bin->video_sink);
break;
case ARG_AUDIO_SINK:
_gst_gvalue_set_gstobject (value, play_bin->audio_sink);
break;
case ARG_VIS_PLUGIN:
_gst_gvalue_set_gstobject (value, play_bin->visualisation);
break;
case ARG_VOLUME:
g_value_set_double (value, play_bin->volume);
break;
case ARG_FRAME:
gst_value_set_mini_object (value, GST_MINI_OBJECT (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);
gst_mini_object_replace ((GstMiniObject **) & play_bin->frame,
GST_MINI_OBJECT_CAST (frame));
/* applications need to know the buffer caps,
* make sure they are always set on the frame */
if (GST_BUFFER_CAPS (play_bin->frame) == NULL) {
GstPad *pad;
if ((pad = gst_element_get_pad (identity, "sink"))) {
gst_buffer_set_caps (play_bin->frame, GST_PAD_CAPS (pad));
gst_object_unref (pad);
}
}
}
/* 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
*/
/* FIXME: this might return NULL if no videosink was found, handle
* this in callers */
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");
}
/* FIXME: this warrants adding a CORE error category for missing
* elements/plugins */
if (sink == NULL) {
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Both autovideosink and xvimagesink elements are missing.")),
(NULL));
return NULL;
}
}
gst_object_ref (sink);
g_hash_table_insert (play_bin->cache, "video_sink", sink);
element = gst_bin_new ("vbin");
identity = gst_element_factory_make ("identity", "id");
g_object_set (identity, "silent", TRUE, NULL);
g_signal_connect (identity, "handoff", G_CALLBACK (handoff), play_bin);
conv = gst_element_factory_make ("ffmpegcolorspace", "vconv");
scale = gst_element_factory_make ("videoscale", "vscale");
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");
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;
}
/* 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-------------+ |
* +--------------------------------------------------+
*/
static GstElement *
gen_text_element (GstPlayBin * play_bin)
{
GstElement *element, *csp, *overlay, *vbin;
GstPad *pad;
/* Create our bin */
element = gst_bin_new ("textbin");
/* Text overlay */
overlay = gst_element_factory_make ("textoverlay", "overlay");
/* Create the video rendering bin */
vbin = gen_video_element (play_bin);
/* If no overlay return the video bin */
if (!overlay) {
GST_WARNING ("No overlay (pango) element, subtitles disabled");
return vbin;
}
/* Set some parameters */
g_object_set (G_OBJECT (overlay),
"halign", "center", "valign", "bottom", NULL);
if (play_bin->font_desc) {
g_object_set (G_OBJECT (play_bin->textoverlay_element),
"font-desc", play_bin->font_desc, NULL);
}
/* Take a ref */
play_bin->textoverlay_element = GST_ELEMENT (gst_object_ref (overlay));
csp = gst_element_factory_make ("ffmpegcolorspace", "subtitlecsp");
/* Add our elements */
gst_bin_add_many (GST_BIN (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;
}
/* 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;
GstPad *pad;
element = g_hash_table_lookup (play_bin->cache, "abin");
if (element != NULL) {
return element;
}
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) {
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) {
GST_ELEMENT_ERROR (play_bin, CORE, MISSING_PLUGIN,
(_("Both autoaudiosink and alsasink elements are missing.")), (NULL));
return NULL;
}
play_bin->audio_sink = GST_ELEMENT (gst_object_ref (sink));
}
gst_object_ref (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");
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;
}
/* 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, *aqueue;
GstPad *pad, *rpad;
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 (element), asink);
gst_bin_add (GST_BIN (element), vqueue);
gst_bin_add (GST_BIN (element), aqueue);
gst_bin_add (GST_BIN (element), vsink);
gst_bin_add (GST_BIN (element), tee);
conv = gst_element_factory_make ("audioconvert", "aconv");
if (play_bin->visualisation) {
gst_object_ref (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");
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 (conv, "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;
}
/* get rid of all installed sinks */
static void
remove_sinks (GstPlayBin * play_bin)
{
GList *sinks;
GstObject *parent;
GstElement *element;
GstPad *pad, *peer;
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 (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 (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 (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 (play_bin), element);
}
g_list_free (play_bin->sinks);
play_bin->sinks = NULL;
/* FIXME: this is probably some refcounting problem */
if (play_bin->visualisation && GST_OBJECT_PARENT (play_bin->visualisation)) {
gst_element_set_state (play_bin->visualisation, GST_STATE_NULL);
gst_bin_remove (GST_BIN (GST_OBJECT_PARENT (play_bin->visualisation)),
play_bin->visualisation);
}
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.
*/
static gboolean
add_sink (GstPlayBin * play_bin, GstElement * sink, GstPad * srcpad,
GstPad * subtitle_pad)
{
GstPad *sinkpad;
GstPadLinkReturn linkres;
GstElement *parent;
GstStateChangeReturn stateret;
g_return_val_if_fail (sink != NULL, FALSE);
/* 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);
}
/* bring it to the PAUSED state so we can link to the peer without
* breaking the flow */
if ((stateret = gst_element_set_state (sink, GST_STATE_PAUSED)) ==
GST_STATE_CHANGE_FAILURE)
goto state_failed;
gst_bin_add (GST_BIN (play_bin), sink);
/* 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 */
if (GST_PAD_LINK_FAILED (linkres)) {
goto subtitle_failed;
}
/* 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_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);
g_free (caps);
gst_element_set_state (sink, GST_STATE_NULL);
gst_bin_remove (GST_BIN (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);
g_free (caps);
return TRUE;
}
}
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 (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;
}
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;
}
if (gst_element_add_pad (GST_ELEMENT (grandparent), ghost)) {
gst_object_unref (textsrcpad);
textsrcpad = ghost;
} else {
GST_WARNING_OBJECT (ghost, "failed adding ghost pad on subtitle-bin");
gst_object_unref (ghost);
gst_object_unref (textsrcpad);
textsrcpad = NULL;
}
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);
}
/* 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 (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)))
break;
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);
}
}
res = gst_play_bin_send_event_to_sink (GST_PLAY_BIN (element), event);
if (flush && res) {
/* need to reset the stream time to 0 after a flushing seek */
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;
}
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 (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_PLAYING_TO_PAUSED:
/* Set audio sink state to NULL to release the sound device,
* but only if we own it (else we might be in chain-transition). */
//if (play_bin->audio_sink != NULL &&
// GST_STATE (play_bin->audio_sink) == GST_STATE_PAUSED) {
// gst_element_set_state (play_bin->audio_sink, GST_STATE_NULL);
//}
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
/* Check for NULL because the state transition may be done by
* gst_bin_dispose which is called by gst_play_bin_dispose, and in that
* case, we don't want to run remove_sinks.
* FIXME: should the NULL test be done in remove_sinks? Should we just
* set the state to NULL in gst_play_bin_dispose?
*/
if (play_bin->cache != NULL) {
remove_sinks (play_bin);
}
if (play_bin->fakesink) {
gst_element_set_state (play_bin->fakesink, GST_STATE_NULL);
gst_bin_remove (GST_BIN (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");
#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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