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examples/app/: Added 3 more example application for using appsrc in random-access mode, pull-mode streaming and pull ...

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Original commit message from CVS:
* examples/app/Makefile.am:
* examples/app/appsrc-ra.c: (feed_data), (seek_data),
(found_source), (bus_message), (main):
* examples/app/appsrc-seekable.c: (feed_data), (seek_data),
(found_source), (bus_message), (main):
* examples/app/appsrc-stream2.c: (feed_data), (found_source),
(bus_message), (main):
Added 3 more example application for using appsrc in random-access mode,
pull-mode streaming and pull mode seekable.
* gst-libs/gst/app/gstappsrc.c: (gst_app_src_class_init),
(gst_app_src_start), (gst_app_src_do_get_size),
(gst_app_src_create):
* gst-libs/gst/app/gstappsrc.h:
Make stream-type property writable.
Unset flushing when starting so that we reuse appsrc.
Inform basesrc about the configured size.
Emit seek-data signal when we are going to a different offset in
random-access mode.
This commit is contained in:
Wim Taymans 2008-06-06 16:50:51 +00:00
parent 23692b06a0
commit 1ec82dec72
7 changed files with 782 additions and 16 deletions
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22
ChangeLog
View file

@ -1,3 +1,25 @@
2008-06-06 Wim Taymans <wim.taymans@collabora.co.uk>
* examples/app/Makefile.am:
* examples/app/appsrc-ra.c: (feed_data), (seek_data),
(found_source), (bus_message), (main):
* examples/app/appsrc-seekable.c: (feed_data), (seek_data),
(found_source), (bus_message), (main):
* examples/app/appsrc-stream2.c: (feed_data), (found_source),
(bus_message), (main):
Added 3 more example application for using appsrc in random-access mode,
pull-mode streaming and pull mode seekable.
* gst-libs/gst/app/gstappsrc.c: (gst_app_src_class_init),
(gst_app_src_start), (gst_app_src_do_get_size),
(gst_app_src_create):
* gst-libs/gst/app/gstappsrc.h:
Make stream-type property writable.
Unset flushing when starting so that we reuse appsrc.
Inform basesrc about the configured size.
Emit seek-data signal when we are going to a different offset in
random-access mode.
2008-06-06 Wim Taymans <wim.taymans@collabora.co.uk>
* examples/app/appsrc-stream.c: (found_source), (main):

15
examples/app/Makefile.am
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@ -1,5 +1,6 @@
noinst_PROGRAMS = appsrc_ex appsrc-stream
noinst_PROGRAMS = appsrc_ex appsrc-stream appsrc-stream2 appsrc-ra \
appsrc-seekable
appsrc_ex_SOURCES = appsrc_ex.c
appsrc_ex_CFLAGS = $(GST_CFLAGS) $(GCONF_CFLAGS)
@ -10,3 +11,15 @@ appsrc_ex_LDFLAGS = \
appsrc_stream_SOURCES = appsrc-stream.c
appsrc_stream_CFLAGS = $(GST_CFLAGS) $(GCONF_CFLAGS)
appsrc_stream_LDFLAGS = $(GST_LIBS)
appsrc_stream2_SOURCES = appsrc-stream2.c
appsrc_stream2_CFLAGS = $(GST_CFLAGS) $(GCONF_CFLAGS)
appsrc_stream2_LDFLAGS = $(GST_LIBS)
appsrc_ra_SOURCES = appsrc-ra.c
appsrc_ra_CFLAGS = $(GST_CFLAGS) $(GCONF_CFLAGS)
appsrc_ra_LDFLAGS = $(GST_LIBS)
appsrc_seekable_SOURCES = appsrc-seekable.c
appsrc_seekable_CFLAGS = $(GST_CFLAGS) $(GCONF_CFLAGS)
appsrc_seekable_LDFLAGS = $(GST_LIBS)

222
examples/app/appsrc-ra.c Normal file
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@ -0,0 +1,222 @@
/* GStreamer
*
* appsrc-ra.c: example for using appsrc in random-access mode.
*
* Copyright (C) 2008 Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
GST_DEBUG_CATEGORY (appsrc_playbin_debug);
#define GST_CAT_DEFAULT appsrc_playbin_debug
/**
* an example application of using appsrc in random-access mode. When the
* appsrc requests data with the need-data signal, we retrieve a buffer of the
* requested size and push it to appsrc.
*
* This is a good example how one would deal with a local file resource.
*
* Appsrc in random-access mode needs seeking support and we must thus connect
* to the seek signal to perform any seeks when requested.
*
* In random-access mode we must set the size of the source material.
*/
typedef struct _App App;
struct _App
{
GstElement *playbin;
GstElement *appsrc;
GMainLoop *loop;
GMappedFile *file;
guint8 *data;
gsize length;
guint64 offset;
};
App s_app;
/* This method is called by the need-data signal callback, we feed data into the
* appsrc with the requested size.
*/
static void
feed_data (GstElement * appsrc, guint size, App * app)
{
GstBuffer *buffer;
GstFlowReturn ret;
buffer = gst_buffer_new ();
if (app->offset >= app->length) {
/* we are EOS, send end-of-stream */
g_signal_emit_by_name (app->appsrc, "end-of-stream", &ret);
return;
}
/* read the amount of data, we are allowed to return less if we are EOS */
if (app->offset + size > app->length)
size = app->length - app->offset;
GST_BUFFER_DATA (buffer) = app->data + app->offset;
GST_BUFFER_SIZE (buffer) = size;
/* we need to set an offset for random access */
GST_BUFFER_OFFSET (buffer) = app->offset;
GST_BUFFER_OFFSET_END (buffer) = app->offset + size;
GST_DEBUG ("feed buffer %p, offset %" G_GUINT64_FORMAT "-%u", buffer,
app->offset, size);
g_signal_emit_by_name (app->appsrc, "push-buffer", buffer, &ret);
app->offset += size;
return;
}
/* called when appsrc wants us to return data from a new position with the next
* call to push-buffer. */
static gboolean
seek_data (GstElement * appsrc, guint64 position, App * app)
{
GST_DEBUG ("seek to offset %" G_GUINT64_FORMAT, position);
app->offset = position;
return TRUE;
}
/* this callback is called when playbin2 has constructed a source object to read
* from. Since we provided the appsrc:// uri to playbin2, this will be the
* appsrc that we must handle. We set up some signals to push data into appsrc
* and one to perform a seek. */
static void
found_source (GObject * object, GObject * orig, GParamSpec * pspec, App * app)
{
/* get a handle to the appsrc */
g_object_get (orig, pspec->name, &app->appsrc, NULL);
GST_DEBUG ("got appsrc %p", app->appsrc);
/* we can set the length in appsrc. This allows some elements to estimate the
* total duration of the stream. It's a good idea to set the property when you
* can but it's not required. */
g_object_set (app->appsrc, "size", app->length, NULL);
g_object_set (app->appsrc, "stream-type", 2, NULL);
/* configure the appsrc, we will push a buffer to appsrc when it needs more
* data */
g_signal_connect (app->appsrc, "need-data", G_CALLBACK (feed_data), app);
g_signal_connect (app->appsrc, "seek-data", G_CALLBACK (seek_data), app);
}
static gboolean
bus_message (GstBus * bus, GstMessage * message, App * app)
{
GST_DEBUG ("got message %s",
gst_message_type_get_name (GST_MESSAGE_TYPE (message)));
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:
g_error ("received error");
g_main_loop_quit (app->loop);
break;
case GST_MESSAGE_EOS:
g_main_loop_quit (app->loop);
break;
default:
break;
}
return TRUE;
}
int
main (int argc, char *argv[])
{
App *app = &s_app;
GError *error = NULL;
GstBus *bus;
gst_init (&argc, &argv);
GST_DEBUG_CATEGORY_INIT (appsrc_playbin_debug, "appsrc-playbin", 0,
"appsrc playbin example");
if (argc < 2) {
g_print ("usage: %s <filename>\n", argv[0]);
return -1;
}
/* try to open the file as an mmapped file */
app->file = g_mapped_file_new (argv[1], FALSE, &error);
if (error) {
g_print ("failed to open file: %s\n", error->message);
g_error_free (error);
return -2;
}
/* get some vitals, this will be used to read data from the mmapped file and
* feed it to appsrc. */
app->length = g_mapped_file_get_length (app->file);
app->data = (guint8 *) g_mapped_file_get_contents (app->file);
app->offset = 0;
/* create a mainloop to get messages */
app->loop = g_main_loop_new (NULL, TRUE);
app->playbin = gst_element_factory_make ("playbin2", NULL);
g_assert (app->playbin);
bus = gst_pipeline_get_bus (GST_PIPELINE (app->playbin));
/* add watch for messages */
gst_bus_add_watch (bus, (GstBusFunc) bus_message, app);
/* set to read from appsrc */
g_object_set (app->playbin, "uri", "appsrc://", NULL);
/* get notification when the source is created so that we get a handle to it
* and can configure it */
g_signal_connect (app->playbin, "deep-notify::source",
(GCallback) found_source, app);
/* go to playing and wait in a mainloop. */
gst_element_set_state (app->playbin, GST_STATE_PLAYING);
/* this mainloop is stopped when we receive an error or EOS */
g_main_loop_run (app->loop);
GST_DEBUG ("stopping");
gst_element_set_state (app->playbin, GST_STATE_NULL);
/* free the file */
g_mapped_file_free (app->file);
gst_object_unref (bus);
g_main_loop_unref (app->loop);
return 0;
}

228
examples/app/appsrc-seekable.c Normal file
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@ -0,0 +1,228 @@
/* GStreamer
*
* appsrc-seekable.c: example for using appsrc in seekable mode.
*
* Copyright (C) 2008 Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
GST_DEBUG_CATEGORY (appsrc_playbin_debug);
#define GST_CAT_DEFAULT appsrc_playbin_debug
/**
* an example application of using appsrc in seekable mode. When the
* appsrc requests data with the need-data signal, we retrieve a buffer and
* push it to appsrc. We can also use the method as demonstrated in
* appsrc-stream.c, ie. pushing buffers when we can.
*
* This is a good example how one would deal with a remote http server that
* supports range requests.
*
* Appsrc in seekable mode needs seeking support and we must thus connect
* to the seek signal to perform any seeks when requested.
*
* In seekable mode we should set the size of the source material.
*/
typedef struct _App App;
struct _App
{
GstElement *playbin;
GstElement *appsrc;
GMainLoop *loop;
GMappedFile *file;
guint8 *data;
gsize length;
guint64 offset;
};
App s_app;
#define CHUNK_SIZE 4096
/* This method is called by the need-data signal callback, we feed data into the
* appsrc with an arbitrary size.
*/
static void
feed_data (GstElement * appsrc, guint size, App * app)
{
GstBuffer *buffer;
guint len;
GstFlowReturn ret;
buffer = gst_buffer_new ();
if (app->offset >= app->length) {
/* we are EOS, send end-of-stream */
g_signal_emit_by_name (app->appsrc, "end-of-stream", &ret);
return;
}
/* read any amount of data, we are allowed to return less if we are EOS */
len = CHUNK_SIZE;
if (app->offset + len > app->length)
len = app->length - app->offset;
GST_BUFFER_DATA (buffer) = app->data + app->offset;
GST_BUFFER_SIZE (buffer) = len;
GST_DEBUG ("feed buffer %p, offset %" G_GUINT64_FORMAT "-%u", buffer,
app->offset, len);
g_signal_emit_by_name (app->appsrc, "push-buffer", buffer, &ret);
app->offset += len;
return;
}
/* called when appsrc wants us to return data from a new position with the next
* call to push-buffer. */
static gboolean
seek_data (GstElement * appsrc, guint64 position, App * app)
{
GST_DEBUG ("seek to offset %" G_GUINT64_FORMAT, position);
app->offset = position;
return TRUE;
}
/* this callback is called when playbin2 has constructed a source object to read
* from. Since we provided the appsrc:// uri to playbin2, this will be the
* appsrc that we must handle. We set up some signals to push data into appsrc
* and one to perform a seek. */
static void
found_source (GObject * object, GObject * orig, GParamSpec * pspec, App * app)
{
/* get a handle to the appsrc */
g_object_get (orig, pspec->name, &app->appsrc, NULL);
GST_DEBUG ("got appsrc %p", app->appsrc);
/* we can set the length in appsrc. This allows some elements to estimate the
* total duration of the stream. It's a good idea to set the property when you
* can but it's not required. */
g_object_set (app->appsrc, "size", app->length, NULL);
/* we are seekable in push mode, this means that the element usually pushes
* out buffers of an undefined size and that seeks happen only occasionally
* and only by request of the user. */
g_object_set (app->appsrc, "stream-type", 1, NULL);
/* configure the appsrc, we will push a buffer to appsrc when it needs more
* data */
g_signal_connect (app->appsrc, "need-data", G_CALLBACK (feed_data), app);
g_signal_connect (app->appsrc, "seek-data", G_CALLBACK (seek_data), app);
}
static gboolean
bus_message (GstBus * bus, GstMessage * message, App * app)
{
GST_DEBUG ("got message %s",
gst_message_type_get_name (GST_MESSAGE_TYPE (message)));
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:
g_error ("received error");
g_main_loop_quit (app->loop);
break;
case GST_MESSAGE_EOS:
g_main_loop_quit (app->loop);
break;
default:
break;
}
return TRUE;
}
int
main (int argc, char *argv[])
{
App *app = &s_app;
GError *error = NULL;
GstBus *bus;
gst_init (&argc, &argv);
GST_DEBUG_CATEGORY_INIT (appsrc_playbin_debug, "appsrc-playbin", 0,
"appsrc playbin example");
if (argc < 2) {
g_print ("usage: %s <filename>\n", argv[0]);
return -1;
}
/* try to open the file as an mmapped file */
app->file = g_mapped_file_new (argv[1], FALSE, &error);
if (error) {
g_print ("failed to open file: %s\n", error->message);
g_error_free (error);
return -2;
}
/* get some vitals, this will be used to read data from the mmapped file and
* feed it to appsrc. */
app->length = g_mapped_file_get_length (app->file);
app->data = (guint8 *) g_mapped_file_get_contents (app->file);
app->offset = 0;
/* create a mainloop to get messages */
app->loop = g_main_loop_new (NULL, TRUE);
app->playbin = gst_element_factory_make ("playbin2", NULL);
g_assert (app->playbin);
bus = gst_pipeline_get_bus (GST_PIPELINE (app->playbin));
/* add watch for messages */
gst_bus_add_watch (bus, (GstBusFunc) bus_message, app);
/* set to read from appsrc */
g_object_set (app->playbin, "uri", "appsrc://", NULL);
/* get notification when the source is created so that we get a handle to it
* and can configure it */
g_signal_connect (app->playbin, "deep-notify::source",
(GCallback) found_source, app);
/* go to playing and wait in a mainloop. */
gst_element_set_state (app->playbin, GST_STATE_PLAYING);
/* this mainloop is stopped when we receive an error or EOS */
g_main_loop_run (app->loop);
GST_DEBUG ("stopping");
gst_element_set_state (app->playbin, GST_STATE_NULL);
/* free the file */
g_mapped_file_free (app->file);
gst_object_unref (bus);
g_main_loop_unref (app->loop);
return 0;
}

218
examples/app/appsrc-stream2.c Normal file
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@ -0,0 +1,218 @@
/* GStreamer
*
* appsrc-stream2.c: example for using appsrc in streaming mode.
*
* Copyright (C) 2008 Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
GST_DEBUG_CATEGORY (appsrc_playbin_debug);
#define GST_CAT_DEFAULT appsrc_playbin_debug
/**
* an example application of using appsrc in streaming pull mode. When the
* appsrc request data with the need-data signal, we retrieve a buffer of an
* arbitrary size and push it to appsrc.
*
* This example keeps the internal buffer queue of appsrc to a minimal size,
* only feeding data to appsrc when needed.
*
* This is a good example how one would deal with a live resource, such as a udp
* socket where one would feed the most recently acquired buffer to appsrc.
*
* Usually one would timestamp the buffers with the running_time of the
* pipeline or configure the appsrc to do timestamping by setting the
* do-timestamp property to TRUE.
*
* Appsrc in streaming mode (the default) does not support seeking so we don't
* have to handle any seek callbacks.
*
* Some formats are able to estimate the duration of the media file based on the
* file length (mp3, mpeg,..), others report an unknown length (ogg,..).
*/
typedef struct _App App;
struct _App
{
GstElement *playbin;
GstElement *appsrc;
GMainLoop *loop;
GMappedFile *file;
guint8 *data;
gsize length;
guint64 offset;
};
App s_app;
#define CHUNK_SIZE 4096
/* This method is called by the need-data signal callback, we feed data into the
* appsrc.
*/
static void
feed_data (GstElement * appsrc, guint size, App * app)
{
GstBuffer *buffer;
guint len;
GstFlowReturn ret;
buffer = gst_buffer_new ();
if (app->offset >= app->length) {
/* we are EOS, send end-of-stream */
g_signal_emit_by_name (app->appsrc, "end-of-stream", &ret);
return;
}
/* read the next chunk */
len = CHUNK_SIZE;
if (app->offset + len > app->length)
len = app->length - app->offset;
GST_BUFFER_DATA (buffer) = app->data + app->offset;
GST_BUFFER_SIZE (buffer) = len;
GST_DEBUG ("feed buffer %p, offset %" G_GUINT64_FORMAT "-%u", buffer,
app->offset, len);
g_signal_emit_by_name (app->appsrc, "push-buffer", buffer, &ret);
app->offset += len;
return;
}
/* this callback is called when playbin2 has constructed a source object to read
* from. Since we provided the appsrc:// uri to playbin2, this will be the
* appsrc that we must handle. We set up a signals to push data into appsrc. */
static void
found_source (GObject * object, GObject * orig, GParamSpec * pspec, App * app)
{
/* get a handle to the appsrc */
g_object_get (orig, pspec->name, &app->appsrc, NULL);
GST_DEBUG ("got appsrc %p", app->appsrc);
/* we can set the length in appsrc. This allows some elements to estimate the
* total duration of the stream. It's a good idea to set the property when you
* can but it's not required. */
g_object_set (app->appsrc, "size", app->length, NULL);
/* configure the appsrc, we will push a buffer to appsrc when it needs more
* data */
g_signal_connect (app->appsrc, "need-data", G_CALLBACK (feed_data), app);
}
static gboolean
bus_message (GstBus * bus, GstMessage * message, App * app)
{
GST_DEBUG ("got message %s",
gst_message_type_get_name (GST_MESSAGE_TYPE (message)));
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:
g_error ("received error");
g_main_loop_quit (app->loop);
break;
case GST_MESSAGE_EOS:
g_main_loop_quit (app->loop);
break;
default:
break;
}
return TRUE;
}
int
main (int argc, char *argv[])
{
App *app = &s_app;
GError *error = NULL;
GstBus *bus;
gst_init (&argc, &argv);
GST_DEBUG_CATEGORY_INIT (appsrc_playbin_debug, "appsrc-playbin", 0,
"appsrc playbin example");
if (argc < 2) {
g_print ("usage: %s <filename>\n", argv[0]);
return -1;
}
/* try to open the file as an mmapped file */
app->file = g_mapped_file_new (argv[1], FALSE, &error);
if (error) {
g_print ("failed to open file: %s\n", error->message);
g_error_free (error);
return -2;
}
/* get some vitals, this will be used to read data from the mmapped file and
* feed it to appsrc. */
app->length = g_mapped_file_get_length (app->file);
app->data = (guint8 *) g_mapped_file_get_contents (app->file);
app->offset = 0;
/* create a mainloop to get messages */
app->loop = g_main_loop_new (NULL, TRUE);
app->playbin = gst_element_factory_make ("playbin2", NULL);
g_assert (app->playbin);
bus = gst_pipeline_get_bus (GST_PIPELINE (app->playbin));
/* add watch for messages */
gst_bus_add_watch (bus, (GstBusFunc) bus_message, app);
/* set to read from appsrc */
g_object_set (app->playbin, "uri", "appsrc://", NULL);
/* get notification when the source is created so that we get a handle to it
* and can configure it */
g_signal_connect (app->playbin, "deep-notify::source",
(GCallback) found_source, app);
/* go to playing and wait in a mainloop. */
gst_element_set_state (app->playbin, GST_STATE_PLAYING);
/* this mainloop is stopped when we receive an error or EOS */
g_main_loop_run (app->loop);
GST_DEBUG ("stopping");
gst_element_set_state (app->playbin, GST_STATE_NULL);
/* free the file */
g_mapped_file_free (app->file);
gst_object_unref (bus);
g_main_loop_unref (app->loop);
return 0;
}

92
gst-libs/gst/app/gstappsrc.c
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@ -115,6 +115,7 @@ static gboolean gst_app_src_unlock_stop (GstBaseSrc * bsrc);
static gboolean gst_app_src_do_seek (GstBaseSrc * src, GstSegment * segment);
static gboolean gst_app_src_is_seekable (GstBaseSrc * src);
static gboolean gst_app_src_check_get_range (GstBaseSrc * src);
static gboolean gst_app_src_do_get_size (GstBaseSrc * src, guint64 * size);
static guint gst_app_src_signals[LAST_SIGNAL] = { 0 };
@ -177,7 +178,8 @@ gst_app_src_class_init (GstAppSrcClass * klass)
g_object_class_install_property (gobject_class, PROP_STREAM_TYPE,
g_param_spec_enum ("stream-type", "Stream Type",
"the type of the stream", GST_TYPE_APP_STREAM_TYPE,
DEFAULT_PROP_STREAM_TYPE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
DEFAULT_PROP_STREAM_TYPE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_BYTES,
g_param_spec_uint64 ("max-bytes", "Max bytes",
@ -268,6 +270,7 @@ gst_app_src_class_init (GstAppSrcClass * klass)
basesrc_class->do_seek = gst_app_src_do_seek;
basesrc_class->is_seekable = gst_app_src_is_seekable;
basesrc_class->check_get_range = gst_app_src_check_get_range;
basesrc_class->get_size = gst_app_src_do_get_size;
klass->push_buffer = gst_app_src_push_buffer;
klass->end_of_stream = gst_app_src_end_of_stream;
@ -421,6 +424,10 @@ gst_app_src_start (GstBaseSrc * bsrc)
g_mutex_lock (appsrc->mutex);
GST_DEBUG_OBJECT (appsrc, "starting");
appsrc->started = TRUE;
/* set the offset to -1 so that we always do a first seek. This is only used
* in random-access mode. */
appsrc->offset = -1;
appsrc->flushing = FALSE;
g_mutex_unlock (appsrc->mutex);
gst_base_src_set_format (bsrc, appsrc->format);
@ -478,6 +485,16 @@ gst_app_src_check_get_range (GstBaseSrc * src)
return res;
}
static gboolean
gst_app_src_do_get_size (GstBaseSrc * src, guint64 * size)
{
GstAppSrc *appsrc = GST_APP_SRC (src);
*size = gst_app_src_get_size (appsrc);
return TRUE;
}
/* will be called in push mode */
static gboolean
gst_app_src_do_seek (GstBaseSrc * src, GstSegment * segment)
@ -516,45 +533,84 @@ gst_app_src_create (GstBaseSrc * bsrc, guint64 offset, guint size,
GstFlowReturn ret;
g_mutex_lock (appsrc->mutex);
while (TRUE) {
/* check flushing first */
if (appsrc->flushing)
goto flushing;
/* check flushing first */
if (G_UNLIKELY (appsrc->flushing))
goto flushing;
if (appsrc->stream_type == GST_APP_STREAM_TYPE_RANDOM_ACCESS) {
/* if we are dealing with a random-access stream, issue a seek if the offset
* changed. */
if (G_UNLIKELY (appsrc->offset != offset)) {
gboolean res;
g_mutex_unlock (appsrc->mutex);
GST_DEBUG_OBJECT (appsrc,
"we are at %" G_GINT64_FORMAT ", seek to %" G_GINT64_FORMAT,
appsrc->offset, offset);
g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_SEEK_DATA], 0,
offset, &res);
if (G_UNLIKELY (!res))
/* failing to seek is fatal */
goto seek_error;
g_mutex_lock (appsrc->mutex);
appsrc->offset = offset;
}
}
while (TRUE) {
/* return data as long as we have some */
if (!g_queue_is_empty (appsrc->queue)) {
again:
*buf = g_queue_pop_head (appsrc->queue);
guint buf_size;
appsrc->queued_bytes -= GST_BUFFER_SIZE (*buf);
*buf = g_queue_pop_head (appsrc->queue);
buf_size = GST_BUFFER_SIZE (*buf);
GST_DEBUG_OBJECT (appsrc, "we have buffer %p of size %u", *buf, buf_size);
appsrc->queued_bytes -= buf_size;
/* only update the offset when in random_access mode */
if (appsrc->stream_type == GST_APP_STREAM_TYPE_RANDOM_ACCESS) {
appsrc->offset += buf_size;
}
gst_buffer_set_caps (*buf, appsrc->caps);
GST_DEBUG_OBJECT (appsrc, "we have buffer %p", *buf);
ret = GST_FLOW_OK;
break;
} else {
/* we have no data, we need some. We fire the signal with the size hint. */
g_mutex_unlock (appsrc->mutex);
/* we have no data, we need some. We fire the signal with the size hint. */
g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_NEED_DATA], 0, size,
NULL);
g_mutex_lock (appsrc->mutex);
/* we can be flushing now because we released the lock */
if (appsrc->flushing)
if (G_UNLIKELY (appsrc->flushing))
goto flushing;
/* if we have a buffer now, retry to return it */
/* if we have a buffer now, continue the loop and try to return it. In
* random-access mode (where a buffer is normally pushed in the above
* signal) we can still be empty because the pushed buffer got flushed or
* when the application pushes the requested buffer later, we support both
* possiblities. */
if (!g_queue_is_empty (appsrc->queue))
goto again;
continue;
/* no buffer yet, maybe we are EOS, if not, block for more data. */
}
/* check EOS */
if (appsrc->is_eos)
if (G_UNLIKELY (appsrc->is_eos))
goto eos;
/* nothing to return, wait a while for new data or flushing */
/* nothing to return, wait a while for new data or flushing. */
g_cond_wait (appsrc->cond, appsrc->mutex);
}
g_mutex_unlock (appsrc->mutex);
@ -574,6 +630,12 @@ eos:
g_mutex_unlock (appsrc->mutex);
return GST_FLOW_UNEXPECTED;
}
seek_error:
{
GST_ELEMENT_ERROR (appsrc, RESOURCE, READ, ("failed to seek"),
GST_ERROR_SYSTEM);
return GST_FLOW_ERROR;
}
}
/* external API */

1
gst-libs/gst/app/gstappsrc.h
View file

@ -76,6 +76,7 @@ struct _GstAppSrc
gboolean started;
gboolean is_eos;
guint64 queued_bytes;
guint64 offset;
GstAppStreamType current_type;
};