2 Copyright (C) 2015 Robin Gareus <robin@gareus.org>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include "pbd/error.h"
26 #include "pbd/failed_constructor.h"
28 #include "timecode/time.h"
29 #include "ardour/ltc_file_reader.h"
34 using namespace ARDOUR;
38 #define BUFFER_SIZE 1024 // audio chunk size
40 LTCFileReader::LTCFileReader (std::string path, double expected_fps, LTC_TV_STANDARD tv_standard)
42 , _expected_fps (expected_fps)
43 , _ltc_tv_standard (tv_standard)
45 , _interleaved_audio_buffer (0)
49 memset (&_info, 0, sizeof (_info));
50 assert (Glib::file_test (_path, Glib::FILE_TEST_EXISTS));
53 throw failed_constructor ();
56 const int apv = rintf (_info.samplerate / _expected_fps);
57 decoder = ltc_decoder_create (apv, 8); // must be able to hold frmes for BUFFER_SIZE
59 #if 0 // TODO allow to auto-detect
60 if (expected_fps == 25.0) {
61 _ltc_tv_standard = LTC_TV_625_50;
63 else if (expected_fps == 30.0) {
64 _ltc_tv_standard = LTC_TV_525_60;
67 _ltc_tv_standard = LTC_TV_FILM_24;
72 LTCFileReader::~LTCFileReader ()
75 ltc_decoder_free (decoder);
76 free (_interleaved_audio_buffer);
80 LTCFileReader::open ()
86 #ifdef PLATFORM_WINDOWS
87 int fd = g_open (_path.c_str (), O_RDONLY, 0444);
89 int fd = ::open (_path.c_str (), O_RDONLY, 0444);
92 error << string_compose (_("LTCFileReader: cannot open file \"%1\""), _path) << endmsg;
96 _sndfile = sf_open_fd (fd, SFM_READ, &_info, true);
100 sf_error_str (0, errbuf, sizeof (errbuf) - 1);
101 error << string_compose (_("LTCFileReader: cannot open file \"%1\" (%3)"), _path, errbuf) << endmsg;
104 if (_info.frames == 0 || _info.channels < 1) {
105 error << string_compose (_("LTCFileReader: \"%1\" is an empty audio file"), _path) << endmsg;
108 _interleaved_audio_buffer = (float*) calloc (_info.channels * BUFFER_SIZE, sizeof (float));
113 LTCFileReader::close ()
121 std::vector<LTCFileReader::LTCMap>
122 LTCFileReader::read_ltc (uint32_t channel, uint32_t max_frames)
124 std::vector<LTCFileReader::LTCMap> rv;
125 ltcsnd_sample_t sound[BUFFER_SIZE];
128 const uint32_t channels = _info.channels;
129 if (channel >= channels) {
130 warning << _("LTCFileReader:: invalid audio channel selected") << endmsg;
135 int64_t n = sf_readf_float (_sndfile, _interleaved_audio_buffer, BUFFER_SIZE);
140 // convert audio to 8bit unsigned
141 for (int64_t i = 0; i < n; ++i) {
142 sound [i]= 128 + _interleaved_audio_buffer[channels * i + channel] * 127;
145 ltc_decoder_write (decoder, sound, n, _samples_read);
147 while (ltc_decoder_read (decoder, &frame)) {
151 ltc_frame_to_time (&stime, &frame.ltc, /*use_date*/ 0);
153 // convert Timecode to samples @ audio-file rate
154 Timecode::Time timecode (_expected_fps);
155 timecode.hours = stime.hours;
156 timecode.minutes = stime.mins;
157 timecode.seconds = stime.secs;
158 timecode.frames = stime.frame;
161 Timecode::timecode_to_sample (
162 timecode, sample, false, false,
166 // align LTC frame relative to video-frame
167 sample -= ltc_frame_alignment (
168 _info.samplerate / _expected_fps,
171 // convert to seconds (session can use session-rate)
172 double fp_sec = frame.off_start / (double) _info.samplerate;
173 double tc_sec = sample / (double) _info.samplerate;
174 rv.push_back (LTCMap (fp_sec, tc_sec));
177 printf("LTC %02d:%02d:%02d:%02d @%9lld -> %9lld -> %fsec\n",
192 if (max_frames > 0 && rv.size () >= max_frames) {