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