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/*
Copyright (C) 2013 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 <boost/shared_ptr.hpp>
#include <stdint.h>
#include "trimmer.h"
using std::cout;
using std::max;
using boost::shared_ptr;
/** @param audio_sample_rate Audio sampling rate, or 0 if there is no audio */
Trimmer::Trimmer (
shared_ptr<Log> log,
int video_trim_start,
int video_trim_end,
int video_length,
int audio_sample_rate,
float frames_per_second,
int dcp_frames_per_second
)
: AudioVideoProcessor (log)
, _video_start (video_trim_start)
, _video_end (video_length - video_trim_end)
, _video_in (0)
, _audio_in (0)
{
FrameRateConversion frc (frames_per_second, dcp_frames_per_second);
if (frc.skip) {
_video_start /= 2;
_video_end /= 2;
} else if (frc.repeat) {
_video_start *= 2;
_video_end *= 2;
}
if (audio_sample_rate) {
_audio_start = video_frames_to_audio_frames (_video_start, audio_sample_rate, frames_per_second);
_audio_end = video_frames_to_audio_frames (_video_end, audio_sample_rate, frames_per_second);
}
/* XXX: this is a hack; if there is no trim at the end, set
the audio end point to infinity so that
shorter-video-than-audio does not trim audio (which breaks
the current set of regression tests). This could be
removed if a) the regression tests are regenerated and b) I
can work out what DCP length should be.
*/
if (video_trim_end == 0) {
_audio_end = INT64_MAX;
}
}
void
Trimmer::process_video (shared_ptr<const Image> image, bool same, shared_ptr<Subtitle> sub)
{
if (_video_in >= _video_start && _video_in < _video_end) {
Video (image, same, sub);
}
++_video_in;
}
void
Trimmer::process_audio (shared_ptr<const AudioBuffers> audio)
{
int64_t offset = _audio_start - _audio_in;
if (offset > audio->frames()) {
/* we haven't reached the start of the untrimmed section yet */
_audio_in += audio->frames ();
return;
}
if (offset < 0) {
offset = 0;
}
int64_t length = _audio_end - max (_audio_in, _audio_start);
if (length < 0) {
_audio_in += audio->frames ();
return;
}
if (length > (audio->frames() - offset)) {
length = audio->frames () - offset;
}
_audio_in += audio->frames ();
if (offset != 0 || length != audio->frames ()) {
shared_ptr<AudioBuffers> copy (new AudioBuffers (audio));
copy->move (offset, 0, length);
copy->set_frames (length);
audio = copy;
}
Audio (audio);
}
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