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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "matcher.h"
#include "image.h"
#include "log.h"
#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)
: 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 (boost::shared_ptr<const Image> image, bool same, boost::shared_ptr<Subtitle> sub, double t)
{
_pixel_format = image->pixel_format ();
_size = image->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 (boost::shared_ptr<const AudioBuffers> b, double t)
{
_channels = b->channels ();
_log->log (String::compose (
"Matcher audio (%1 frames) @ %2 [video=%3, audio=%4, pending_audio=%5]",
b->frames(), 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
Matcher::process_end ()
{
if (_audio_frames == 0 || !_pixel_format || !_size || !_channels) {
/* 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));
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);
}
_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;
}
extra_video_needed -= black_video_frames / _frames_per_second;
}
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.
*/
int64_t const block = _sample_rate / 2;
shared_ptr<AudioBuffers> b (new AudioBuffers (_channels.get(), block));
b->make_silent ();
while (to_do > 0) {
int64_t const this_time = min (to_do, block);
b->set_frames (this_time);
Audio (b);
_audio_frames += b->frames ();
to_do -= this_time;
}
}
}
void
Matcher::repeat_last_video ()
{
if (!_last_image) {
shared_ptr<Image> im (new SimpleImage (_pixel_format.get(), _size.get(), true));
im->make_black ();
_last_image = im;
}
Video (_last_image, true, _last_subtitle);
++_video_frames;
}
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