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Xavi Artigas 2013-05-21 17:31:15 +02:00
parent 1d0cd2fc9a
commit 1db12234ad
2 changed files with 962 additions and 962 deletions
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1136
gst-sdk/tutorials/android-tutorial-4/jni/tutorial-4.c
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788
gst-sdk/tutorials/xcode iOS/Tutorial 4/GStreamerBackend.m
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@ -1,394 +1,394 @@
#import "GStreamerBackend.h"
#include <gst/gst.h>
#include <gst/interfaces/xoverlay.h>
#include <gst/video/video.h>
GST_DEBUG_CATEGORY_STATIC (debug_category);
#define GST_CAT_DEFAULT debug_category
/* Do not allow seeks to be performed closer than this distance. It is visually useless, and will probably
* confuse some demuxers. */
#define SEEK_MIN_DELAY (500 * GST_MSECOND)
@interface GStreamerBackend()
-(void)setUIMessage:(gchar*) message;
-(void)app_function;
-(void)check_initialization_complete;
@end
@implementation GStreamerBackend {
id ui_delegate; /* Class that we use to interact with the user interface */
GstElement *pipeline; /* The running pipeline */
GstElement *video_sink; /* The video sink element which receives XOverlay commands */
GMainContext *context; /* GLib context used to run the main loop */
GMainLoop *main_loop; /* GLib main loop */
gboolean initialized; /* To avoid informing the UI multiple times about the initialization */
UIView *ui_video_view; /* UIView that holds the video */
GstState state; /* Current pipeline state */
GstState target_state; /* Desired pipeline state, to be set once buffering is complete */
gint64 duration; /* Cached clip duration */
gint64 desired_position; /* Position to seek to, once the pipeline is running */
GstClockTime last_seek_time; /* For seeking overflow prevention (throttling) */
gboolean is_live; /* Live streams do not use buffering */
}
/*
* Interface methods
*/
-(id) init:(id) uiDelegate videoView:(UIView *)video_view
{
if (self = [super init])
{
self->ui_delegate = uiDelegate;
self->ui_video_view = video_view;
self->duration = GST_CLOCK_TIME_NONE;
GST_DEBUG_CATEGORY_INIT (debug_category, "tutorial-4", 0, "iOS tutorial 4");
gst_debug_set_threshold_for_name("tutorial-4", GST_LEVEL_DEBUG);
/* Start the bus monitoring task */
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self app_function];
});
}
return self;
}
-(void) deinit
{
if (main_loop) {
g_main_loop_quit(main_loop);
}
}
-(void) play
{
target_state = GST_STATE_PLAYING;
is_live = (gst_element_set_state (pipeline, GST_STATE_PLAYING) == GST_STATE_CHANGE_NO_PREROLL);
}
-(void) pause
{
target_state = GST_STATE_PAUSED;
is_live = (gst_element_set_state (pipeline, GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
}
-(void) setUri:(NSString*)uri
{
const char *char_uri = [uri UTF8String];
g_object_set(pipeline, "uri", char_uri, NULL);
GST_DEBUG ("URI set to %s", char_uri);
}
-(void) setPosition:(NSInteger)milliseconds
{
gint64 position = (gint64)(milliseconds * GST_MSECOND);
if (state >= GST_STATE_PAUSED) {
execute_seek(position, self);
} else {
GST_DEBUG ("Scheduling seek to %" GST_TIME_FORMAT " for later", GST_TIME_ARGS (position));
self->desired_position = position;
}
}
/*
* Private methods
*/
/* Change the message on the UI through the UI delegate */
-(void)setUIMessage:(gchar*) message
{
NSString *string = [NSString stringWithUTF8String:message];
if(ui_delegate && [ui_delegate respondsToSelector:@selector(gstreamerSetUIMessage:)])
{
[ui_delegate gstreamerSetUIMessage:string];
}
}
/* Tell the application what is the current position and clip duration */
-(void) setCurrentUIPosition:(gint)pos duration:(gint)dur
{
if(ui_delegate && [ui_delegate respondsToSelector:@selector(setCurrentPosition:duration:)])
{
[ui_delegate setCurrentPosition:pos duration:dur];
}
}
/* If we have pipeline and it is running, query the current position and clip duration and inform
* the application */
static gboolean refresh_ui (GStreamerBackend *self) {
GstFormat fmt = GST_FORMAT_TIME;
gint64 position;
/* We do not want to update anything unless we have a working pipeline in the PAUSED or PLAYING state */
if (!self || !self->pipeline || self->state < GST_STATE_PAUSED)
return TRUE;
/* If we didn't know it yet, query the stream duration */
if (!GST_CLOCK_TIME_IS_VALID (self->duration)) {
gst_element_query_duration (self->pipeline, &fmt, &self->duration);
}
if (gst_element_query_position (self->pipeline, &fmt, &position)) {
/* The UI expects these values in milliseconds, and GStreamer provides nanoseconds */
[self setCurrentUIPosition:position / GST_MSECOND duration:self->duration / GST_MSECOND];
}
return TRUE;
}
/* Forward declaration for the delayed seek callback */
static gboolean delayed_seek_cb (GStreamerBackend *self);
/* Perform seek, if we are not too close to the previous seek. Otherwise, schedule the seek for
* some time in the future. */
static void execute_seek (gint64 position, GStreamerBackend *self) {
gint64 diff;
if (position == GST_CLOCK_TIME_NONE)
return;
diff = gst_util_get_timestamp () - self->last_seek_time;
if (GST_CLOCK_TIME_IS_VALID (self->last_seek_time) && diff < SEEK_MIN_DELAY) {
/* The previous seek was too close, delay this one */
GSource *timeout_source;
if (self->desired_position == GST_CLOCK_TIME_NONE) {
/* There was no previous seek scheduled. Setup a timer for some time in the future */
timeout_source = g_timeout_source_new ((SEEK_MIN_DELAY - diff) / GST_MSECOND);
g_source_set_callback (timeout_source, (GSourceFunc)delayed_seek_cb, (__bridge void *)self, NULL);
g_source_attach (timeout_source, self->context);
g_source_unref (timeout_source);
}
/* Update the desired seek position. If multiple petitions are received before it is time
* to perform a seek, only the last one is remembered. */
self->desired_position = position;
GST_DEBUG ("Throttling seek to %" GST_TIME_FORMAT ", will be in %" GST_TIME_FORMAT,
GST_TIME_ARGS (position), GST_TIME_ARGS (SEEK_MIN_DELAY - diff));
} else {
/* Perform the seek now */
GST_DEBUG ("Seeking to %" GST_TIME_FORMAT, GST_TIME_ARGS (position));
self->last_seek_time = gst_util_get_timestamp ();
gst_element_seek_simple (self->pipeline, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT, position);
self->desired_position = GST_CLOCK_TIME_NONE;
}
}
/* Delayed seek callback. This gets called by the timer setup in the above function. */
static gboolean delayed_seek_cb (GStreamerBackend *self) {
GST_DEBUG ("Doing delayed seek to %" GST_TIME_FORMAT, GST_TIME_ARGS (self->desired_position));
execute_seek (self->desired_position, self);
return FALSE;
}
/* Retrieve errors from the bus and show them on the UI */
static void error_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
{
GError *err;
gchar *debug_info;
gchar *message_string;
gst_message_parse_error (msg, &err, &debug_info);
message_string = g_strdup_printf ("Error received from element %s: %s", GST_OBJECT_NAME (msg->src), err->message);
g_clear_error (&err);
g_free (debug_info);
[self setUIMessage:message_string];
g_free (message_string);
gst_element_set_state (self->pipeline, GST_STATE_NULL);
}
/* Called when the End Of the Stream is reached. Just move to the beginning of the media and pause. */
static void eos_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self) {
self->target_state = GST_STATE_PAUSED;
self->is_live = (gst_element_set_state (self->pipeline, GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
execute_seek (0, self);
}
/* Called when the duration of the media changes. Just mark it as unknown, so we re-query it in the next UI refresh. */
static void duration_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self) {
self->duration = GST_CLOCK_TIME_NONE;
}
/* Called when buffering messages are received. We inform the UI about the current buffering level and
* keep the pipeline paused until 100% buffering is reached. At that point, set the desired state. */
static void buffering_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self) {
gint percent;
if (self->is_live)
return;
gst_message_parse_buffering (msg, &percent);
if (percent < 100 && self->target_state >= GST_STATE_PAUSED) {
gchar * message_string = g_strdup_printf ("Buffering %d%%", percent);
gst_element_set_state (self->pipeline, GST_STATE_PAUSED);
[self setUIMessage:message_string];
g_free (message_string);
} else if (self->target_state >= GST_STATE_PLAYING) {
gst_element_set_state (self->pipeline, GST_STATE_PLAYING);
} else if (self->target_state >= GST_STATE_PAUSED) {
[self setUIMessage:"Buffering complete"];
}
}
/* Called when the clock is lost */
static void clock_lost_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self) {
if (self->target_state >= GST_STATE_PLAYING) {
gst_element_set_state (self->pipeline, GST_STATE_PAUSED);
gst_element_set_state (self->pipeline, GST_STATE_PLAYING);
}
}
/* Retrieve the video sink's Caps and tell the application about the media size */
static void check_media_size (GStreamerBackend *self) {
GstElement *video_sink;
GstPad *video_sink_pad;
GstCaps *caps;
GstVideoFormat fmt;
int width;
int height;
/* Retrieve the Caps at the entrance of the video sink */
g_object_get (self->pipeline, "video-sink", &video_sink, NULL);
/* Do nothing if there is no video sink (this might be an audio-only clip */
if (!video_sink) return;
video_sink_pad = gst_element_get_static_pad (video_sink, "sink");
caps = gst_pad_get_negotiated_caps (video_sink_pad);
if (gst_video_format_parse_caps(caps, &fmt, &width, &height)) {
int par_n, par_d;
if (gst_video_parse_caps_pixel_aspect_ratio (caps, &par_n, &par_d)) {
width = width * par_n / par_d;
}
GST_DEBUG ("Media size is %dx%d, notifying application", width, height);
if (self->ui_delegate && [self->ui_delegate respondsToSelector:@selector(mediaSizeChanged:height:)])
{
[self->ui_delegate mediaSizeChanged:width height:height];
}
}
gst_caps_unref(caps);
gst_object_unref (video_sink_pad);
gst_object_unref(video_sink);
}
/* Notify UI about pipeline state changes */
static void state_changed_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
{
GstState old_state, new_state, pending_state;
gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
/* Only pay attention to messages coming from the pipeline, not its children */
if (GST_MESSAGE_SRC (msg) == GST_OBJECT (self->pipeline)) {
self->state = new_state;
gchar *message = g_strdup_printf("State changed to %s", gst_element_state_get_name(new_state));
[self setUIMessage:message];
g_free (message);
if (old_state == GST_STATE_READY && new_state == GST_STATE_PAUSED)
{
check_media_size(self);
/* If there was a scheduled seek, perform it now that we have moved to the Paused state */
if (GST_CLOCK_TIME_IS_VALID (self->desired_position))
execute_seek (self->desired_position, self);
}
}
}
/* Check if all conditions are met to report GStreamer as initialized.
* These conditions will change depending on the application */
-(void) check_initialization_complete
{
if (!initialized && main_loop) {
GST_DEBUG ("Initialization complete, notifying application.");
if (ui_delegate && [ui_delegate respondsToSelector:@selector(gstreamerInitialized)])
{
[ui_delegate gstreamerInitialized];
}
initialized = TRUE;
}
}
/* Main method for the bus monitoring code */
-(void) app_function
{
GstBus *bus;
GSource *timeout_source;
GSource *bus_source;
GError *error = NULL;
GST_DEBUG ("Creating pipeline");
/* Create our own GLib Main Context and make it the default one */
context = g_main_context_new ();
g_main_context_push_thread_default(context);
/* Build pipeline */
pipeline = gst_parse_launch("playbin2", &error);
if (error) {
gchar *message = g_strdup_printf("Unable to build pipeline: %s", error->message);
g_clear_error (&error);
[self setUIMessage:message];
g_free (message);
return;
}
/* Set the pipeline to READY, so it can already accept a window handle */
gst_element_set_state(pipeline, GST_STATE_READY);
video_sink = gst_bin_get_by_interface(GST_BIN(pipeline), GST_TYPE_X_OVERLAY);
if (!video_sink) {
GST_ERROR ("Could not retrieve video sink");
return;
}
gst_x_overlay_set_window_handle(GST_X_OVERLAY(video_sink), (guintptr) (id) ui_video_view);
/* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
bus = gst_element_get_bus (pipeline);
bus_source = gst_bus_create_watch (bus);
g_source_set_callback (bus_source, (GSourceFunc) gst_bus_async_signal_func, NULL, NULL);
g_source_attach (bus_source, context);
g_source_unref (bus_source);
g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::eos", (GCallback)eos_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::state-changed", (GCallback)state_changed_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::duration", (GCallback)duration_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::buffering", (GCallback)buffering_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::clock-lost", (GCallback)clock_lost_cb, (__bridge void *)self);
gst_object_unref (bus);
/* Register a function that GLib will call 4 times per second */
timeout_source = g_timeout_source_new (250);
g_source_set_callback (timeout_source, (GSourceFunc)refresh_ui, (__bridge void *)self, NULL);
g_source_attach (timeout_source, context);
g_source_unref (timeout_source);
/* Create a GLib Main Loop and set it to run */
GST_DEBUG ("Entering main loop...");
main_loop = g_main_loop_new (context, FALSE);
[self check_initialization_complete];
g_main_loop_run (main_loop);
GST_DEBUG ("Exited main loop");
g_main_loop_unref (main_loop);
main_loop = NULL;
/* Free resources */
g_main_context_pop_thread_default(context);
g_main_context_unref (context);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
pipeline = NULL;
ui_delegate = NULL;
ui_video_view = NULL;
return;
}
@end
#import "GStreamerBackend.h"
#include <gst/gst.h>
#include <gst/interfaces/xoverlay.h>
#include <gst/video/video.h>
GST_DEBUG_CATEGORY_STATIC (debug_category);
#define GST_CAT_DEFAULT debug_category
/* Do not allow seeks to be performed closer than this distance. It is visually useless, and will probably
* confuse some demuxers. */
#define SEEK_MIN_DELAY (500 * GST_MSECOND)
@interface GStreamerBackend()
-(void)setUIMessage:(gchar*) message;
-(void)app_function;
-(void)check_initialization_complete;
@end
@implementation GStreamerBackend {
id ui_delegate; /* Class that we use to interact with the user interface */
GstElement *pipeline; /* The running pipeline */
GstElement *video_sink; /* The video sink element which receives XOverlay commands */
GMainContext *context; /* GLib context used to run the main loop */
GMainLoop *main_loop; /* GLib main loop */
gboolean initialized; /* To avoid informing the UI multiple times about the initialization */
UIView *ui_video_view; /* UIView that holds the video */
GstState state; /* Current pipeline state */
GstState target_state; /* Desired pipeline state, to be set once buffering is complete */
gint64 duration; /* Cached clip duration */
gint64 desired_position; /* Position to seek to, once the pipeline is running */
GstClockTime last_seek_time; /* For seeking overflow prevention (throttling) */
gboolean is_live; /* Live streams do not use buffering */
}
/*
* Interface methods
*/
-(id) init:(id) uiDelegate videoView:(UIView *)video_view
{
if (self = [super init])
{
self->ui_delegate = uiDelegate;
self->ui_video_view = video_view;
self->duration = GST_CLOCK_TIME_NONE;
GST_DEBUG_CATEGORY_INIT (debug_category, "tutorial-4", 0, "iOS tutorial 4");
gst_debug_set_threshold_for_name("tutorial-4", GST_LEVEL_DEBUG);
/* Start the bus monitoring task */
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self app_function];
});
}
return self;
}
-(void) deinit
{
if (main_loop) {
g_main_loop_quit(main_loop);
}
}
-(void) play
{
target_state = GST_STATE_PLAYING;
is_live = (gst_element_set_state (pipeline, GST_STATE_PLAYING) == GST_STATE_CHANGE_NO_PREROLL);
}
-(void) pause
{
target_state = GST_STATE_PAUSED;
is_live = (gst_element_set_state (pipeline, GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
}
-(void) setUri:(NSString*)uri
{
const char *char_uri = [uri UTF8String];
g_object_set(pipeline, "uri", char_uri, NULL);
GST_DEBUG ("URI set to %s", char_uri);
}
-(void) setPosition:(NSInteger)milliseconds
{
gint64 position = (gint64)(milliseconds * GST_MSECOND);
if (state >= GST_STATE_PAUSED) {
execute_seek(position, self);
} else {
GST_DEBUG ("Scheduling seek to %" GST_TIME_FORMAT " for later", GST_TIME_ARGS (position));
self->desired_position = position;
}
}
/*
* Private methods
*/
/* Change the message on the UI through the UI delegate */
-(void)setUIMessage:(gchar*) message
{
NSString *string = [NSString stringWithUTF8String:message];
if(ui_delegate && [ui_delegate respondsToSelector:@selector(gstreamerSetUIMessage:)])
{
[ui_delegate gstreamerSetUIMessage:string];
}
}
/* Tell the application what is the current position and clip duration */
-(void) setCurrentUIPosition:(gint)pos duration:(gint)dur
{
if(ui_delegate && [ui_delegate respondsToSelector:@selector(setCurrentPosition:duration:)])
{
[ui_delegate setCurrentPosition:pos duration:dur];
}
}
/* If we have pipeline and it is running, query the current position and clip duration and inform
* the application */
static gboolean refresh_ui (GStreamerBackend *self) {
GstFormat fmt = GST_FORMAT_TIME;
gint64 position;
/* We do not want to update anything unless we have a working pipeline in the PAUSED or PLAYING state */
if (!self || !self->pipeline || self->state < GST_STATE_PAUSED)
return TRUE;
/* If we didn't know it yet, query the stream duration */
if (!GST_CLOCK_TIME_IS_VALID (self->duration)) {
gst_element_query_duration (self->pipeline, &fmt, &self->duration);
}
if (gst_element_query_position (self->pipeline, &fmt, &position)) {
/* The UI expects these values in milliseconds, and GStreamer provides nanoseconds */
[self setCurrentUIPosition:position / GST_MSECOND duration:self->duration / GST_MSECOND];
}
return TRUE;
}
/* Forward declaration for the delayed seek callback */
static gboolean delayed_seek_cb (GStreamerBackend *self);
/* Perform seek, if we are not too close to the previous seek. Otherwise, schedule the seek for
* some time in the future. */
static void execute_seek (gint64 position, GStreamerBackend *self) {
gint64 diff;
if (position == GST_CLOCK_TIME_NONE)
return;
diff = gst_util_get_timestamp () - self->last_seek_time;
if (GST_CLOCK_TIME_IS_VALID (self->last_seek_time) && diff < SEEK_MIN_DELAY) {
/* The previous seek was too close, delay this one */
GSource *timeout_source;
if (self->desired_position == GST_CLOCK_TIME_NONE) {
/* There was no previous seek scheduled. Setup a timer for some time in the future */
timeout_source = g_timeout_source_new ((SEEK_MIN_DELAY - diff) / GST_MSECOND);
g_source_set_callback (timeout_source, (GSourceFunc)delayed_seek_cb, (__bridge void *)self, NULL);
g_source_attach (timeout_source, self->context);
g_source_unref (timeout_source);
}
/* Update the desired seek position. If multiple requests are received before it is time
* to perform a seek, only the last one is remembered. */
self->desired_position = position;
GST_DEBUG ("Throttling seek to %" GST_TIME_FORMAT ", will be in %" GST_TIME_FORMAT,
GST_TIME_ARGS (position), GST_TIME_ARGS (SEEK_MIN_DELAY - diff));
} else {
/* Perform the seek now */
GST_DEBUG ("Seeking to %" GST_TIME_FORMAT, GST_TIME_ARGS (position));
self->last_seek_time = gst_util_get_timestamp ();
gst_element_seek_simple (self->pipeline, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT, position);
self->desired_position = GST_CLOCK_TIME_NONE;
}
}
/* Delayed seek callback. This gets called by the timer setup in the above function. */
static gboolean delayed_seek_cb (GStreamerBackend *self) {
GST_DEBUG ("Doing delayed seek to %" GST_TIME_FORMAT, GST_TIME_ARGS (self->desired_position));
execute_seek (self->desired_position, self);
return FALSE;
}
/* Retrieve errors from the bus and show them on the UI */
static void error_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
{
GError *err;
gchar *debug_info;
gchar *message_string;
gst_message_parse_error (msg, &err, &debug_info);
message_string = g_strdup_printf ("Error received from element %s: %s", GST_OBJECT_NAME (msg->src), err->message);
g_clear_error (&err);
g_free (debug_info);
[self setUIMessage:message_string];
g_free (message_string);
gst_element_set_state (self->pipeline, GST_STATE_NULL);
}
/* Called when the End Of the Stream is reached. Just move to the beginning of the media and pause. */
static void eos_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self) {
self->target_state = GST_STATE_PAUSED;
self->is_live = (gst_element_set_state (self->pipeline, GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
execute_seek (0, self);
}
/* Called when the duration of the media changes. Just mark it as unknown, so we re-query it in the next UI refresh. */
static void duration_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self) {
self->duration = GST_CLOCK_TIME_NONE;
}
/* Called when buffering messages are received. We inform the UI about the current buffering level and
* keep the pipeline paused until 100% buffering is reached. At that point, set the desired state. */
static void buffering_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self) {
gint percent;
if (self->is_live)
return;
gst_message_parse_buffering (msg, &percent);
if (percent < 100 && self->target_state >= GST_STATE_PAUSED) {
gchar * message_string = g_strdup_printf ("Buffering %d%%", percent);
gst_element_set_state (self->pipeline, GST_STATE_PAUSED);
[self setUIMessage:message_string];
g_free (message_string);
} else if (self->target_state >= GST_STATE_PLAYING) {
gst_element_set_state (self->pipeline, GST_STATE_PLAYING);
} else if (self->target_state >= GST_STATE_PAUSED) {
[self setUIMessage:"Buffering complete"];
}
}
/* Called when the clock is lost */
static void clock_lost_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self) {
if (self->target_state >= GST_STATE_PLAYING) {
gst_element_set_state (self->pipeline, GST_STATE_PAUSED);
gst_element_set_state (self->pipeline, GST_STATE_PLAYING);
}
}
/* Retrieve the video sink's Caps and tell the application about the media size */
static void check_media_size (GStreamerBackend *self) {
GstElement *video_sink;
GstPad *video_sink_pad;
GstCaps *caps;
GstVideoFormat fmt;
int width;
int height;
/* Retrieve the Caps at the entrance of the video sink */
g_object_get (self->pipeline, "video-sink", &video_sink, NULL);
/* Do nothing if there is no video sink (this might be an audio-only clip */
if (!video_sink) return;
video_sink_pad = gst_element_get_static_pad (video_sink, "sink");
caps = gst_pad_get_negotiated_caps (video_sink_pad);
if (gst_video_format_parse_caps(caps, &fmt, &width, &height)) {
int par_n, par_d;
if (gst_video_parse_caps_pixel_aspect_ratio (caps, &par_n, &par_d)) {
width = width * par_n / par_d;
}
GST_DEBUG ("Media size is %dx%d, notifying application", width, height);
if (self->ui_delegate && [self->ui_delegate respondsToSelector:@selector(mediaSizeChanged:height:)])
{
[self->ui_delegate mediaSizeChanged:width height:height];
}
}
gst_caps_unref(caps);
gst_object_unref (video_sink_pad);
gst_object_unref(video_sink);
}
/* Notify UI about pipeline state changes */
static void state_changed_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
{
GstState old_state, new_state, pending_state;
gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
/* Only pay attention to messages coming from the pipeline, not its children */
if (GST_MESSAGE_SRC (msg) == GST_OBJECT (self->pipeline)) {
self->state = new_state;
gchar *message = g_strdup_printf("State changed to %s", gst_element_state_get_name(new_state));
[self setUIMessage:message];
g_free (message);
if (old_state == GST_STATE_READY && new_state == GST_STATE_PAUSED)
{
check_media_size(self);
/* If there was a scheduled seek, perform it now that we have moved to the Paused state */
if (GST_CLOCK_TIME_IS_VALID (self->desired_position))
execute_seek (self->desired_position, self);
}
}
}
/* Check if all conditions are met to report GStreamer as initialized.
* These conditions will change depending on the application */
-(void) check_initialization_complete
{
if (!initialized && main_loop) {
GST_DEBUG ("Initialization complete, notifying application.");
if (ui_delegate && [ui_delegate respondsToSelector:@selector(gstreamerInitialized)])
{
[ui_delegate gstreamerInitialized];
}
initialized = TRUE;
}
}
/* Main method for the bus monitoring code */
-(void) app_function
{
GstBus *bus;
GSource *timeout_source;
GSource *bus_source;
GError *error = NULL;
GST_DEBUG ("Creating pipeline");
/* Create our own GLib Main Context and make it the default one */
context = g_main_context_new ();
g_main_context_push_thread_default(context);
/* Build pipeline */
pipeline = gst_parse_launch("playbin2", &error);
if (error) {
gchar *message = g_strdup_printf("Unable to build pipeline: %s", error->message);
g_clear_error (&error);
[self setUIMessage:message];
g_free (message);
return;
}
/* Set the pipeline to READY, so it can already accept a window handle */
gst_element_set_state(pipeline, GST_STATE_READY);
video_sink = gst_bin_get_by_interface(GST_BIN(pipeline), GST_TYPE_X_OVERLAY);
if (!video_sink) {
GST_ERROR ("Could not retrieve video sink");
return;
}
gst_x_overlay_set_window_handle(GST_X_OVERLAY(video_sink), (guintptr) (id) ui_video_view);
/* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
bus = gst_element_get_bus (pipeline);
bus_source = gst_bus_create_watch (bus);
g_source_set_callback (bus_source, (GSourceFunc) gst_bus_async_signal_func, NULL, NULL);
g_source_attach (bus_source, context);
g_source_unref (bus_source);
g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::eos", (GCallback)eos_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::state-changed", (GCallback)state_changed_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::duration", (GCallback)duration_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::buffering", (GCallback)buffering_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::clock-lost", (GCallback)clock_lost_cb, (__bridge void *)self);
gst_object_unref (bus);
/* Register a function that GLib will call 4 times per second */
timeout_source = g_timeout_source_new (250);
g_source_set_callback (timeout_source, (GSourceFunc)refresh_ui, (__bridge void *)self, NULL);
g_source_attach (timeout_source, context);
g_source_unref (timeout_source);
/* Create a GLib Main Loop and set it to run */
GST_DEBUG ("Entering main loop...");
main_loop = g_main_loop_new (context, FALSE);
[self check_initialization_complete];
g_main_loop_run (main_loop);
GST_DEBUG ("Exited main loop");
g_main_loop_unref (main_loop);
main_loop = NULL;
/* Free resources */
g_main_context_pop_thread_default(context);
g_main_context_unref (context);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
pipeline = NULL;
ui_delegate = NULL;
ui_video_view = NULL;
return;
}
@end