Consistent AU factory Preset IDs

[ardour.git] / libs / ardour / ltc_file_reader.cc

diff --git a/libs/ardour/ltc_file_reader.cc b/libs/ardour/ltc_file_reader.cc
index 0ffc16405121eb633a51658801a8175f667f129a..6c510956b129e6e9456c6d547f94cad3a88a3365 100644 (file)
--- a/libs/ardour/ltc_file_reader.cc
+++ b/libs/ardour/ltc_file_reader.cc
@@ -42,13 +42,70 @@ 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);
+}
+
+samplepos_t
+LTCReader::read (uint32_t& hh, uint32_t& mm, uint32_t& ss, uint32_t& ff)
+{
+       LTCFrameExt ltc_frame;
+       if (0 == ltc_decoder_read (_decoder, &ltc_frame)) {
+               return -1;
+       }
+
+       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;
+       return ltc_frame.off_start;
+}
+
+
 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 +116,6 @@ 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 +128,13 @@ 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);
 }
 
@@ -128,7 +185,6 @@ 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) {
@@ -142,52 +198,32 @@ LTCFileReader::read_ltc (uint32_t channel, uint32_t max_frames)
                        break;
                }
 
-               // convert audio to 8bit unsigned
+               /* 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);
+               _reader->raw_write (sound, n, _samples_read);
+               Timecode::Time timecode (_expected_fps);
 
-                       // 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;
+               samplepos_t off_start;
 
+               while ((off_start = _reader->read (timecode.hours, timecode.minutes, timecode.seconds, timecode.frames)) >= 0) {
                        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 (
+                       /* align LTC frame relative to video-frame */
+                       off_start += 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;
+                       /* convert to seconds (session can use session-rate) */
+                       double fp_sec = 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 +233,6 @@ LTCFileReader::read_ltc (uint32_t channel, uint32_t max_frames)
                if (max_frames > 0 && rv.size () >= max_frames) {
                        break;
                }
-
        }
 
        return rv;