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assrender: Synchronize text and video by taking the running time instead of the stream time

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This commit is contained in:
Sebastian Dröge 2009-11-05 17:06:18 +01:00
parent 8feed39593
commit 51da9d976f
1 changed files with 51 additions and 21 deletions
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72
ext/assrender/gstassrender.c
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@ -175,6 +175,7 @@ gst_assrender_init (Gstassrender * render, GstassrenderClass * gclass)
render->embeddedfonts = TRUE;
gst_segment_init (&render->video_segment, GST_FORMAT_TIME);
gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME);
render->ass_library = ass_library_init ();
ass_set_fonts_dir (render->ass_library, "./");
@ -264,6 +265,8 @@ gst_assrender_change_state (GstElement * element, GstStateChange transition)
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
render->subtitle_flushing = FALSE;
gst_segment_init (&render->video_segment, GST_FORMAT_TIME);
gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME);
break;
case GST_STATE_CHANGE_NULL_TO_READY:
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
@ -451,17 +454,22 @@ gst_assrender_setcaps_text (GstPad * pad, GstCaps * caps)
static void
gst_assrender_process_text (Gstassrender * render, GstBuffer * buffer)
gst_assrender_process_text (Gstassrender * render, GstBuffer * buffer,
GstClockTime running_time, GstClockTime duration)
{
char *data = (gchar *) GST_BUFFER_DATA (buffer);
guint size = GST_BUFFER_SIZE (buffer);
double pts_start, pts_end;
pts_start = GST_BUFFER_TIMESTAMP (buffer);
pts_start = running_time;
pts_start /= GST_MSECOND;
pts_end = GST_BUFFER_DURATION (buffer);
pts_end = duration;
pts_end /= GST_MSECOND;
GST_DEBUG_OBJECT (render,
"Processing subtitles with running time %" GST_TIME_FORMAT
" and duration %" GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
GST_TIME_ARGS (duration));
ass_process_chunk (render->ass_track, data, size, pts_start, pts_end);
gst_buffer_unref (buffer);
}
@ -473,8 +481,6 @@ gst_assrender_chain_video (GstPad * pad, GstBuffer * buffer)
GstFlowReturn ret = GST_FLOW_OK;
gboolean in_seg = FALSE;
gint64 start, stop, clip_start = 0, clip_stop = 0;
double timestamp;
double step;
ASS_Image *ass_image;
render = GST_ASSRENDER (GST_PAD_PARENT (pad));
@ -520,14 +526,25 @@ gst_assrender_chain_video (GstPad * pad, GstBuffer * buffer)
g_mutex_lock (render->subtitle_mutex);
if (render->subtitle_pending) {
if (GST_BUFFER_TIMESTAMP (render->subtitle_pending) <=
GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer)) {
gst_assrender_process_text (render, render->subtitle_pending);
GstClockTime sub_running_time, vid_running_time;
GstClockTime sub_duration, vid_duration;
sub_running_time =
gst_segment_to_running_time (&render->subtitle_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (render->subtitle_pending));
vid_running_time =
gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buffer));
sub_duration = GST_BUFFER_DURATION (render->subtitle_pending);
vid_duration = GST_BUFFER_DURATION (buffer);
if (sub_running_time <= vid_running_time + vid_duration) {
gst_assrender_process_text (render, render->subtitle_pending,
sub_running_time, sub_duration);
render->subtitle_pending = NULL;
g_cond_signal (render->subtitle_cond);
} else if (GST_BUFFER_TIMESTAMP (render->subtitle_pending) +
GST_BUFFER_DURATION (render->subtitle_pending) <=
GST_BUFFER_TIMESTAMP (buffer)) {
} else if (sub_running_time + sub_duration <= vid_running_time) {
gst_buffer_unref (render->subtitle_pending);
render->subtitle_pending = NULL;
g_cond_signal (render->subtitle_cond);
@ -538,19 +555,24 @@ gst_assrender_chain_video (GstPad * pad, GstBuffer * buffer)
/* now start rendering subtitles, if all conditions are met */
if (render->renderer_init_ok && render->track_init_ok && render->enable) {
int counter;
GstClockTime running_time;
double timestamp;
double step;
timestamp = GST_BUFFER_TIMESTAMP (buffer);
GST_DEBUG_OBJECT (render, "rendering frame for timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
running_time =
gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buffer));
GST_DEBUG_OBJECT (render,
"rendering frame for running time %" GST_TIME_FORMAT,
GST_TIME_ARGS (running_time));
/* libass needs timestamps in ms */
timestamp = timestamp / GST_MSECOND;
timestamp = running_time / GST_MSECOND;
/* only for testing right now. could possibly be used for optimizations? */
step = ass_step_sub (render->ass_track, timestamp, 1);
GST_DEBUG_OBJECT (render, "Current timestamp: %" GST_TIME_FORMAT
GST_DEBUG_OBJECT (render, "Current running time: %" GST_TIME_FORMAT
" // Next event: %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (step * GST_MSECOND));
GST_TIME_ARGS (running_time), GST_TIME_ARGS (step * GST_MSECOND));
/* not sure what the last parameter to this call is for (detect_change) */
ass_image = ass_render_frame (render->ass_renderer, render->ass_track,
@ -612,6 +634,7 @@ gst_assrender_chain_text (GstPad * pad, GstBuffer * buffer)
GstFlowReturn ret = GST_FLOW_OK;
Gstassrender *render;
GstClockTime timestamp, duration;
GstClockTime sub_running_time, vid_running_time;
render = GST_ASSRENDER (GST_PAD_PARENT (pad));
@ -629,7 +652,14 @@ gst_assrender_chain_text (GstPad * pad, GstBuffer * buffer)
return GST_FLOW_OK;
}
if (timestamp > render->video_segment.last_stop) {
sub_running_time =
gst_segment_to_running_time (&render->subtitle_segment, GST_FORMAT_TIME,
timestamp);
vid_running_time =
gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
render->video_segment.last_stop);
if (sub_running_time > vid_running_time) {
g_assert (render->subtitle_pending == NULL);
g_mutex_lock (render->subtitle_mutex);
if (G_UNLIKELY (render->subtitle_flushing)) {
@ -642,12 +672,12 @@ gst_assrender_chain_text (GstPad * pad, GstBuffer * buffer)
render->subtitle_pending = buffer;
g_cond_wait (render->subtitle_cond, render->subtitle_mutex);
g_mutex_unlock (render->subtitle_mutex);
} else if (timestamp + duration < render->video_segment.last_stop) {
} else if (sub_running_time + duration < vid_running_time) {
GST_DEBUG_OBJECT (render, "Too late text buffer, dropping");
gst_buffer_unref (buffer);
ret = GST_FLOW_OK;
} else {
gst_assrender_process_text (render, buffer);
gst_assrender_process_text (render, buffer, sub_running_time, duration);
}
GST_DEBUG_OBJECT (render,