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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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Add some code comments.
This commit is contained in:
Xavi Artigas
parent
232d63a6b2
commit
0df42274ec
4 changed files with 96 additions and 80 deletions
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@ -184,41 +184,6 @@ static gboolean delayed_seek_cb (GStreamerBackend *self) {
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return FALSE;
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}
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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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/* 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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@ -276,6 +241,42 @@ static void clock_lost_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
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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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@ -4,11 +4,11 @@
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@interface VideoViewController () {
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GStreamerBackend *gst_backend;
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int media_width;
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int media_height;
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Boolean dragging_slider;
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Boolean is_local_media;
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Boolean is_playing_desired;
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int media_width; /* Width of the clip */
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int media_height; /* height ofthe clip */
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Boolean dragging_slider; /* Whether the time slider is being dragged or not */
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Boolean is_local_media; /* Whether this clip is stored locally or is being streamed */
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Boolean is_playing_desired; /* Whether the user asked to go to PLAYING */
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}
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@end
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@ -20,6 +20,9 @@
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/*
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* Private methods
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*/
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/* The text widget acts as an slave for the seek bar, so it reflects what the seek bar shows, whether
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* it is an actual pipeline position or the position the user is currently dragging to. */
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- (void) updateTimeWidget
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{
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NSInteger position = time_slider.value / 1000;
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@ -94,6 +97,8 @@
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is_playing_desired = NO;
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}
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/* Called when the time slider position has changed, either because the user dragged it or
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* we programmatically changed its position. dragging_slider tells us which one happened */
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- (IBAction)sliderValueChanged:(id)sender {
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if (!dragging_slider) return;
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// If this is a local file, allow scrub seeking, this is, seek as soon as the slider is moved.
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@ -102,11 +107,13 @@
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[self updateTimeWidget];
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}
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/* Called when the user starts to drag the time slider */
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- (IBAction)sliderTouchDown:(id)sender {
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[gst_backend pause];
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dragging_slider = YES;
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}
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/* Called when the user stops dragging the time slider */
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- (IBAction)sliderTouchUp:(id)sender {
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dragging_slider = NO;
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// If this is a remote file, scrub seeking is probably not going to work smoothly enough.
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@ -184,41 +184,6 @@ static gboolean delayed_seek_cb (GStreamerBackend *self) {
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return FALSE;
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}
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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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/* 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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@ -276,6 +241,42 @@ static void clock_lost_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
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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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@ -4,11 +4,11 @@
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@interface VideoViewController () {
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GStreamerBackend *gst_backend;
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int media_width;
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int media_height;
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Boolean dragging_slider;
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Boolean is_local_media;
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Boolean is_playing_desired;
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int media_width; /* Width of the clip */
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int media_height; /* height ofthe clip */
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Boolean dragging_slider; /* Whether the time slider is being dragged or not */
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Boolean is_local_media; /* Whether this clip is stored locally or is being streamed */
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Boolean is_playing_desired; /* Whether the user asked to go to PLAYING */
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}
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@end
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@ -20,6 +20,9 @@
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/*
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* Private methods
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*/
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/* The text widget acts as an slave for the seek bar, so it reflects what the seek bar shows, whether
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* it is an actual pipeline position or the position the user is currently dragging to. */
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- (void) updateTimeWidget
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{
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NSInteger position = time_slider.value / 1000;
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@ -94,6 +97,8 @@
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is_playing_desired = NO;
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}
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/* Called when the time slider position has changed, either because the user dragged it or
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* we programmatically changed its position. dragging_slider tells us which one happened */
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- (IBAction)sliderValueChanged:(id)sender {
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if (!dragging_slider) return;
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// If this is a local file, allow scrub seeking, this is, seek as soon as the slider is moved.
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@ -102,11 +107,13 @@
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[self updateTimeWidget];
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}
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/* Called when the user starts to drag the time slider */
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- (IBAction)sliderTouchDown:(id)sender {
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[gst_backend pause];
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dragging_slider = YES;
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}
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/* Called when the user stops dragging the time slider */
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- (IBAction)sliderTouchUp:(id)sender {
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dragging_slider = NO;
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// If this is a remote file, scrub seeking is probably not going to work smoothly enough.
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