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Retrieve media size from video sink once the pipe is in PAUSED and infom the application.

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This commit is contained in:
Xavi Artigas 2012-10-24 18:14:36 +02:00
parent 9b4ce1ee63
commit df304f1bae
1 changed files with 37 additions and 23 deletions
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60
gst-sdk/tutorials/android-tutorial-4/jni/tutorial-4.c
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@ -110,6 +110,40 @@ static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
gst_element_set_state (data->pipeline, GST_STATE_NULL);
}
/* Called when Pad Caps change on the video sink */
static void check_media_size (CustomData *data) {
JNIEnv *env = get_jni_env ();
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 (data->pipeline, "video-sink", &video_sink, NULL);
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 changed to %dx%d, notifying application", width, height);
(*env)->CallVoidMethod (env, data->app, on_media_size_changed_method_id, (jint)width, (jint)height);
if ((*env)->ExceptionCheck (env)) {
GST_ERROR ("Failed to call Java method");
(*env)->ExceptionClear (env);
}
}
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, CustomData *data) {
GstState old_state, new_state, pending_state;
@ -119,32 +153,12 @@ static void state_changed_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
gchar *message = g_strdup_printf("State changed to %s", gst_element_state_get_name(new_state));
set_ui_message(message, data);
g_free (message);
}
}
/* Called when Pad Caps change on the video sink */
static void caps_cb (GstPad *pad, GParamSpec *pspec, CustomData *data) {
JNIEnv *env = get_jni_env ();
GstVideoFormat fmt;
int width;
int height;
GstCaps *caps;
caps = gst_pad_get_negotiated_caps (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 changed to %dx%d", width, height);
(*env)->CallVoidMethod (env, data->app, on_media_size_changed_method_id, (jint)width, (jint)height);
if ((*env)->ExceptionCheck (env)) {
GST_ERROR ("Failed to call Java method");
(*env)->ExceptionClear (env);
if (old_state == GST_STATE_READY && new_state == GST_STATE_PAUSED) {
/* By now the sink already knows the media size */
check_media_size(data);
}
}
gst_caps_unref(caps);
}
/* Check if all conditions are met to report GStreamer as initialized.