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Fix rate changes by using seeks instead of steps.

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This commit is contained in:
Xavi Artigas 2012-07-03 18:31:49 +02:00
parent ecff617bf3
commit 7fa1aede37
1 changed files with 39 additions and 10 deletions
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49
gst-sdk/tutorials/basic-tutorial-13.c
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@ -3,13 +3,45 @@
typedef struct _CustomData { typedef struct _CustomData {
GstElement *pipeline; GstElement *pipeline;
GstElement *video_sink;
GMainLoop *loop; GMainLoop *loop;
gboolean playing; /* Playing or Paused */ gboolean playing; /* Playing or Paused */
gdouble rate; /* Current playback rate */ gdouble rate; /* Current playback rate (can be negative) */
gboolean backward; /* Forward or backwards */
} CustomData; } CustomData;
/* Send seek event to change rate */
static void send_seek_event (CustomData *data) {
gint64 position;
GstFormat format = GST_FORMAT_TIME;
GstEvent *seek_event;
/* Obtain the current position, needed for the seek event */
if (!gst_element_query_position (data->pipeline, &format, &position)) {
g_printerr ("Unable to retrieve current position.\n");
return;
}
/* Create the seek event */
if (data->rate > 0) {
seek_event = gst_event_new_seek (data->rate, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE,
GST_SEEK_TYPE_SET, position, GST_SEEK_TYPE_NONE, 0);
} else {
seek_event = gst_event_new_seek (data->rate, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE,
GST_SEEK_TYPE_NONE, 0, GST_SEEK_TYPE_SET, position);
}
if (data->video_sink == NULL) {
/* If we have not done so, obtain the sink through which we will send the seek events */
g_object_get (data->pipeline, "video_sink", &data->video_sink, NULL);
}
/* Send the event */
gst_element_send_event (data->video_sink, seek_event);
g_print ("Current rate: %g\n", data->rate);
}
/* Process keyboard input */ /* Process keyboard input */
static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomData *data) { static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomData *data) {
gchar *str = NULL; gchar *str = NULL;
@ -30,16 +62,11 @@ static gboolean handle_keyboard (GIOChannel *source, GIOCondition cond, CustomDa
} else { } else {
data->rate /= 2.0; data->rate /= 2.0;
} }
gst_element_send_event (data->pipeline, send_seek_event (data);
gst_event_new_step (GST_FORMAT_TIME, -1, data->rate, TRUE, FALSE));
g_print ("Current rate: %g\n", data->rate);
break; break;
case 'd': case 'd':
data->backward = !data->backward; data->rate *= -1.0;
gst_element_send_event (data->pipeline, send_seek_event (data);
gst_event_new_seek (data->backward ? -data->rate : data->rate,
GST_FORMAT_TIME, GST_SEEK_FLAG_NONE, GST_SEEK_TYPE_NONE, 0, GST_SEEK_TYPE_NONE, 0));
g_print ("Going %s\n", data->backward ? "backwards" : "forward");
break; break;
case 'n': case 'n':
gst_element_send_event (data->pipeline, gst_element_send_event (data->pipeline,
@ -107,6 +134,8 @@ int main(int argc, char *argv[]) {
g_main_loop_unref (data.loop); g_main_loop_unref (data.loop);
g_io_channel_unref (io_stdin); g_io_channel_unref (io_stdin);
gst_element_set_state (data.pipeline, GST_STATE_NULL); gst_element_set_state (data.pipeline, GST_STATE_NULL);
if (data.video_sink != NULL)
gst_object_unref (data.video_sink);
gst_object_unref (data.pipeline); gst_object_unref (data.pipeline);
return 0; return 0;
} }