#include "i18n.h"
using std::min;
+using std::cout;
+using std::list;
using boost::shared_ptr;
Matcher::Matcher (shared_ptr<Log> log, int sample_rate, float frames_per_second)
- : AudioVideoProcessor (log)
+ : Processor (log)
, _sample_rate (sample_rate)
, _frames_per_second (frames_per_second)
, _video_frames (0)
, _audio_frames (0)
+ , _had_first_video (false)
+ , _had_first_audio (false)
{
}
void
-Matcher::process_video (shared_ptr<Image> i, bool same, shared_ptr<Subtitle> s)
+Matcher::process_video (shared_ptr<Image> image, bool same, boost::shared_ptr<Subtitle> sub, double t)
{
- Video (i, same, s);
- _video_frames++;
+ _pixel_format = image->pixel_format ();
+ _size = image->size ();
- _pixel_format = i->pixel_format ();
- _size = i->size ();
+ _log->log(String::compose("Matcher video @ %1 [audio=%2, video=%3, pending_audio=%4]", t, _audio_frames, _video_frames, _pending_audio.size()));
+
+ if (!_first_input) {
+ _first_input = t;
+ }
+
+ bool const this_is_first_video = !_had_first_video;
+ _had_first_video = true;
+
+ if (this_is_first_video && _had_first_audio) {
+ /* First video since we got audio */
+ fix_start (t);
+ }
+
+ /* Video before audio is fine, since we can make up an arbitrary difference
+ with audio samples (contrasting with video which is quantised to frames)
+ */
+
+ /* Difference between where this video is and where it should be */
+ double const delta = t - _first_input.get() - _video_frames / _frames_per_second;
+ double const one_frame = 1 / _frames_per_second;
+
+ if (delta > one_frame) {
+ /* Insert frames to make up the difference */
+ int const extra = rint (delta / one_frame);
+ for (int i = 0; i < extra; ++i) {
+ repeat_last_video ();
+ _log->log (String::compose ("Extra video frame inserted at %1s", _video_frames / _frames_per_second));
+ }
+ }
+
+ if (delta > -one_frame) {
+ Video (image, same, sub);
+ ++_video_frames;
+ } else {
+ /* We are omitting a frame to keep things right */
+ _log->log (String::compose ("Frame removed at %1s", t));
+ }
+
+ _last_image = image;
+ _last_subtitle = sub;
}
void
-Matcher::process_audio (shared_ptr<AudioBuffers> b)
+Matcher::process_audio (shared_ptr<AudioBuffers> b, double t)
{
- Audio (b);
- _audio_frames += b->frames ();
-
_channels = b->channels ();
+
+ _log->log (String::compose ("Matcher audio @ %1 [video=%2, audio=%3, pending_audio=%4]", t, _video_frames, _audio_frames, _pending_audio.size()));
+
+ if (!_first_input) {
+ _first_input = t;
+ }
+
+ bool const this_is_first_audio = _had_first_audio;
+ _had_first_audio = true;
+
+ if (!_had_first_video) {
+ /* No video yet; we must postpone these data until we have some */
+ _pending_audio.push_back (AudioRecord (b, t));
+ } else if (this_is_first_audio && !_had_first_video) {
+ /* First audio since we got video */
+ _pending_audio.push_back (AudioRecord (b, t));
+ fix_start (_first_input.get ());
+ } else {
+ /* Normal running. We assume audio time stamps are consecutive */
+ Audio (b);
+ _audio_frames += b->frames ();
+ }
}
void
/* We won't do anything */
return;
}
+
+ _log->log (String::compose ("Matcher has seen %1 video frames (which equals %2 audio frames) and %3 audio frames",
+ _video_frames, video_frames_to_audio_frames (_video_frames, _sample_rate, _frames_per_second), _audio_frames));
- int64_t audio_short_by_frames = video_frames_to_audio_frames (_video_frames, _sample_rate, _frames_per_second) - _audio_frames;
-
- _log->log (
- String::compose (
- N_("Matching processor has seen %1 video frames (which equals %2 audio frames) and %3 audio frames"),
- _video_frames,
- video_frames_to_audio_frames (_video_frames, _sample_rate, _frames_per_second),
- _audio_frames
- )
- );
+ match ((double (_audio_frames) / _sample_rate) - (double (_video_frames) / _frames_per_second));
+}
+
+void
+Matcher::fix_start (double first_video)
+{
+ assert (!_pending_audio.empty ());
+
+ _log->log (String::compose ("Fixing start; video at %1, audio at %2", first_video, _pending_audio.front().time));
+
+ match (first_video - _pending_audio.front().time);
+
+ for (list<AudioRecord>::iterator i = _pending_audio.begin(); i != _pending_audio.end(); ++i) {
+ process_audio (i->audio, i->time);
+ }
- if (audio_short_by_frames < 0) {
-
- _log->log (String::compose (N_("%1 too many audio frames"), -audio_short_by_frames));
-
- /* We have seen more audio than video. Emit enough black video frames so that we reverse this */
- int const black_video_frames = ceil (-audio_short_by_frames * _frames_per_second / _sample_rate);
+ _pending_audio.clear ();
+}
+
+void
+Matcher::match (double extra_video_needed)
+{
+ _log->log (String::compose ("Match %1", extra_video_needed));
+
+ if (extra_video_needed > 0) {
+
+ /* Emit black video frames */
+ int const black_video_frames = ceil (extra_video_needed * _frames_per_second);
+
_log->log (String::compose (N_("Emitting %1 frames of black video"), black_video_frames));
shared_ptr<Image> black (new SimpleImage (_pixel_format.get(), _size.get(), true));
black->make_black ();
for (int i = 0; i < black_video_frames; ++i) {
Video (black, i != 0, shared_ptr<Subtitle>());
+ ++_video_frames;
}
-
- /* Now recompute our check value */
- audio_short_by_frames = video_frames_to_audio_frames (_video_frames, _sample_rate, _frames_per_second) - _audio_frames;
+
+ extra_video_needed -= black_video_frames / _frames_per_second;
}
-
- if (audio_short_by_frames > 0) {
- _log->log (String::compose (N_("Emitted %1 too few audio frames"), audio_short_by_frames));
+
+ if (extra_video_needed < 0) {
+
+ /* Emit silence */
+
+ int64_t to_do = -extra_video_needed * _sample_rate;
+ _log->log (String::compose (N_("Emitting %1 frames of silence"), to_do));
/* Do things in half second blocks as I think there may be limits
to what FFmpeg (and in particular the resampler) can cope with.
shared_ptr<AudioBuffers> b (new AudioBuffers (_channels.get(), block));
b->make_silent ();
- int64_t to_do = audio_short_by_frames;
while (to_do > 0) {
int64_t const this_time = min (to_do, block);
b->set_frames (this_time);
}
}
}
+
+void
+Matcher::repeat_last_video ()
+{
+ if (!_last_image) {
+ _last_image.reset (new SimpleImage (_pixel_format.get(), _size.get(), true));
+ _last_image->make_black ();
+ }
+
+ Video (_last_image, true, _last_subtitle);
+ ++_video_frames;
+}
+
projects / dcpomatic.git / blobdiff