ardour/livetrax
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Refactor LTC File decoder, prepare for Lua bindings

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This commit is contained in:
Robin Gareus 2018-07-17 09:12:38 +02:00
parent 854df0ae24
commit e5a181c323
2 changed files with 91 additions and 32 deletions
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21
libs/ardour/ardour/ltc_file_reader.h
View File

@ -29,6 +29,22 @@
namespace ARDOUR {
class LIBARDOUR_API LTCReader
{
public:
LTCReader (int expected_apv, LTC_TV_STANDARD tv_standard = LTC_TV_FILM_24);
~LTCReader ();
void write (float const*, samplecnt_t n_samples, samplepos_t pos = -1);
void raw_write (ltcsnd_sample_t*, size_t, ltc_off_t);
bool read (uint32_t& hh, uint32_t& mm, uint32_t& ss, uint32_t& ff);
private:
LTCDecoder* _decoder;
samplecnt_t _position;
};
class LIBARDOUR_API LTCFileReader
{
public:
@ -60,9 +76,8 @@ private:
SNDFILE* _sndfile;
SF_INFO _info;
LTCDecoder* decoder;
float* _interleaved_audio_buffer;
uint32_t _frames_decoded;
LTCReader* _reader;
float* _interleaved_audio_buffer;
samplecnt_t _samples_read;
};

102
libs/ardour/ltc_file_reader.cc
View File

@ -42,13 +42,80 @@ using std::string;
#define BUFFER_SIZE 1024 // audio chunk size
LTCReader::LTCReader (int expected_apv, LTC_TV_STANDARD tv_standard)
: _position (0)
{
_decoder = ltc_decoder_create (expected_apv, 8); // must be able to hold frmes for BUFFER_SIZE
}
LTCReader::~LTCReader ()
{
ltc_decoder_free (_decoder);
}
void
LTCReader::write (float const* data, samplecnt_t n_samples, samplepos_t pos)
{
ltc_off_t off = _position;
if (pos < 0) {
off = _position;
_position += n_samples;
}
samplecnt_t remain = n_samples;
while (remain > 0) {
ltcsnd_sample_t sound[BUFFER_SIZE];
int c = std::min (remain, (samplecnt_t)BUFFER_SIZE);
for (int i = 0; i < c; ++i) {
sound[i] = 128 + (*data++) * 127.0;
}
ltc_decoder_write (_decoder, sound, c, off);
off += c;
remain -= c;
}
}
void
LTCReader::raw_write (ltcsnd_sample_t* buf, size_t size, ltc_off_t off)
{
ltc_decoder_write (_decoder, buf, size, off);
}
bool
LTCReader::read (uint32_t& hh, uint32_t& mm, uint32_t& ss, uint32_t& ff)
{
LTCFrameExt ltc_frame;
bool rv = 0 != ltc_decoder_read (_decoder, &ltc_frame);
if (rv) {
SMPTETimecode stime;
ltc_frame_to_time (&stime, &ltc_frame.ltc, /*use_date*/ 0);
hh = stime.hours;
mm = stime.mins;
ss = stime.secs;
ff = stime.frame;
#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
}
return rv;
}
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)
, _reader (0)
, _interleaved_audio_buffer (0)
, _frames_decoded (0)
, _samples_read (0)
{
memset (&_info, 0, sizeof (_info));
@ -59,7 +126,6 @@ LTCFileReader::LTCFileReader (std::string path, double expected_fps, LTC_TV_STAN
}
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) {
@ -72,12 +138,13 @@ LTCFileReader::LTCFileReader (std::string path, double expected_fps, LTC_TV_STAN
_ltc_tv_standard = LTC_TV_FILM_24;
}
#endif
_reader = new LTCReader (apv, _ltc_tv_standard);
}
LTCFileReader::~LTCFileReader ()
{
close ();
ltc_decoder_free (decoder);
delete _reader;
free (_interleaved_audio_buffer);
}
@ -147,21 +214,10 @@ LTCFileReader::read_ltc (uint32_t channel, uint32_t max_frames)
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;
_reader->raw_write (sound, n, _samples_read);
Timecode::Time timecode (_expected_fps);
while (_reader->read (timecode.hours, timecode.minutes, timecode.seconds, timecode.frames)) {
int64_t sample = 0;
Timecode::timecode_to_sample (
timecode, sample, false, false,
@ -177,17 +233,6 @@ LTCFileReader::read_ltc (uint32_t channel, uint32_t max_frames)
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) {
@ -197,7 +242,6 @@ LTCFileReader::read_ltc (uint32_t channel, uint32_t max_frames)
if (max_frames > 0 && rv.size () >= max_frames) {
break;
}
}
return rv;