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authorRobin Gareus <robin@gareus.org>2018-07-17 09:12:38 +0200
committerRobin Gareus <robin@gareus.org>2018-07-17 09:44:34 +0200
commite5a181c323243a03338f5a9934a5df254986370d (patch)
treed916ff7dbc9905222414205c74d207b907c33bf0 /libs/ardour/ltc_file_reader.cc
parent854df0ae24ff997979fa5d3e005a4a5cb4eb3acb (diff)
Refactor LTC File decoder, prepare for Lua bindings
Diffstat (limited to 'libs/ardour/ltc_file_reader.cc')
-rw-r--r--libs/ardour/ltc_file_reader.cc102
1 files changed, 73 insertions, 29 deletions
diff --git a/libs/ardour/ltc_file_reader.cc b/libs/ardour/ltc_file_reader.cc
index 0ffc164051..45b91bfa5d 100644
--- a/libs/ardour/ltc_file_reader.cc
+++ b/libs/ardour/ltc_file_reader.cc
@@ -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;