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/*
Copyright (C) 2015 Robin Gareus <robin@gareus.org>
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 <fcntl.h>
#include <sys/stat.h>
#include <glib.h>
#include "pbd/gstdio_compat.h"
#include <assert.h>
#include <string.h>
#include <glibmm.h>
#include "pbd/error.h"
#include "pbd/failed_constructor.h"
#include "timecode/time.h"
#include "ardour/ltc_file_reader.h"
#include "pbd/i18n.h"
using namespace std;
using namespace ARDOUR;
using namespace PBD;
using std::string;
#define BUFFER_SIZE 1024 // audio chunk size
LTCFileReader::LTCFileReader (std::string path, double expected_fps, LTC_TV_STANDARD tv_standard)
: _path (path)
, _expected_fps (expected_fps)
, _ltc_tv_standard (tv_standard)
, _sndfile (0)
, _interleaved_audio_buffer (0)
, _frames_decoded (0)
, _samples_read (0)
{
memset (&_info, 0, sizeof (_info));
assert (Glib::file_test (_path, Glib::FILE_TEST_EXISTS));
if (open ()) {
throw failed_constructor ();
}
const int apv = rintf (_info.samplerate / _expected_fps);
decoder = ltc_decoder_create (apv, 8); // must be able to hold frmes for BUFFER_SIZE
#if 0 // TODO allow to auto-detect
if (expected_fps == 25.0) {
_ltc_tv_standard = LTC_TV_625_50;
}
else if (expected_fps == 30.0) {
_ltc_tv_standard = LTC_TV_525_60;
}
else {
_ltc_tv_standard = LTC_TV_FILM_24;
}
#endif
}
LTCFileReader::~LTCFileReader ()
{
close ();
ltc_decoder_free (decoder);
free (_interleaved_audio_buffer);
}
int
LTCFileReader::open ()
{
if (_sndfile) {
return 0;
}
#ifdef PLATFORM_WINDOWS
int fd = g_open (_path.c_str (), O_RDONLY, 0444);
#else
int fd = ::open (_path.c_str (), O_RDONLY, 0444);
#endif
if (fd == -1) {
error << string_compose (_("LTCFileReader: cannot open file \"%1\""), _path) << endmsg;
return -1;
}
_sndfile = sf_open_fd (fd, SFM_READ, &_info, true);
if (_sndfile == 0) {
char errbuf[1024];
sf_error_str (0, errbuf, sizeof (errbuf) - 1);
error << string_compose (_("LTCFileReader: cannot open file \"%1\" (%3)"), _path, errbuf) << endmsg;
return -1;
}
if (_info.frames == 0 || _info.channels < 1) {
error << string_compose (_("LTCFileReader: \"%1\" is an empty audio file"), _path) << endmsg;
return -1;
}
_interleaved_audio_buffer = (float*) calloc (_info.channels * BUFFER_SIZE, sizeof (float));
return 0;
}
void
LTCFileReader::close ()
{
if (_sndfile) {
sf_close (_sndfile);
_sndfile = 0;
}
}
std::vector<LTCFileReader::LTCMap>
LTCFileReader::read_ltc (uint32_t channel, uint32_t max_frames)
{
std::vector<LTCFileReader::LTCMap> rv;
ltcsnd_sample_t sound[BUFFER_SIZE];
LTCFrameExt frame;
const uint32_t channels = _info.channels;
if (channel >= channels) {
warning << _("LTCFileReader:: invalid audio channel selected") << endmsg;
return rv;
}
while (1) {
int64_t n = sf_readf_float (_sndfile, _interleaved_audio_buffer, BUFFER_SIZE);
if (n <= 0) {
break;
}
// convert audio to 8bit unsigned
for (int64_t i = 0; i < n; ++i) {
sound [i]= 128 + _interleaved_audio_buffer[channels * i + channel] * 127;
}
ltc_decoder_write (decoder, sound, n, _samples_read);
while (ltc_decoder_read (decoder, &frame)) {
SMPTETimecode stime;
++_frames_decoded;
ltc_frame_to_time (&stime, &frame.ltc, /*use_date*/ 0);
// convert Timecode to samples @ audio-file rate
Timecode::Time timecode (_expected_fps);
timecode.hours = stime.hours;
timecode.minutes = stime.mins;
timecode.seconds = stime.secs;
timecode.frames = stime.frame;
int64_t sample = 0;
Timecode::timecode_to_sample (
timecode, sample, false, false,
_info.samplerate,
0, 0, 0);
// align LTC frame relative to video-frame
sample -= ltc_frame_alignment (
_info.samplerate / _expected_fps,
_ltc_tv_standard);
// convert to seconds (session can use session-rate)
double fp_sec = frame.off_start / (double) _info.samplerate;
double tc_sec = sample / (double) _info.samplerate;
rv.push_back (LTCMap (fp_sec, tc_sec));
#if 0 // DEBUG
printf("LTC %02d:%02d:%02d:%02d @%9lld -> %9lld -> %fsec\n",
stime.hours,
stime.mins,
stime.secs,
stime.frame,
frame.off_start,
sample,
tc_sec);
#endif
}
if (n > 0) {
_samples_read += n;
}
if (max_frames > 0 && rv.size () >= max_frames) {
break;
}
}
return rv;
}
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