From 8bee256e4f004488e8998b4418d919fd9803c021 Mon Sep 17 00:00:00 2001 From: Robin Gareus Date: Sun, 20 Sep 2015 03:17:26 +0200 Subject: prepare LTC File Reader --- libs/ardour/ardour/ltc_file_reader.h | 72 +++++++++++++ libs/ardour/ltc_file_reader.cc | 199 +++++++++++++++++++++++++++++++++++ libs/ardour/wscript | 1 + 3 files changed, 272 insertions(+) create mode 100644 libs/ardour/ardour/ltc_file_reader.h create mode 100644 libs/ardour/ltc_file_reader.cc diff --git a/libs/ardour/ardour/ltc_file_reader.h b/libs/ardour/ardour/ltc_file_reader.h new file mode 100644 index 0000000000..92ea07f87f --- /dev/null +++ b/libs/ardour/ardour/ltc_file_reader.h @@ -0,0 +1,72 @@ +/* + Copyright (C) 2015 Robin Gareus + + 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. +*/ + +#ifndef __libardour_ltc_file_reader_h__ +#define __libardour_ltc_file_reader_h__ + +#include +#include + +#include + +#include "ardour/libardour_visibility.h" +#include "ardour/types.h" + +namespace ARDOUR { + +class LIBARDOUR_API LTCFileReader +{ +public: + struct LTCMap { + double framepos_sec; // relative to start of file + double timecode_sec; // timecode + + LTCMap (double p, double t) { + framepos_sec = p; + timecode_sec = t; + } + }; + + LTCFileReader (std::string path, double expected_fps, LTC_TV_STANDARD tv_standard = LTC_TV_FILM_24); + ~LTCFileReader (); + + uint32_t channels () const { return _info.channels; } + std::vector read_ltc (uint32_t channel, uint32_t max_frames = 1); + +private: + int open(); + void close (); + + std::string _path; + + double _expected_fps; + LTC_TV_STANDARD _ltc_tv_standard; + + SNDFILE* _sndfile; + SF_INFO _info; + + LTCDecoder* decoder; + float* _interleaved_audio_buffer; + uint32_t _frames_decoded; + framecnt_t _samples_read; + +}; + +} // namespace ARDOUR + +#endif /* __libardour_ltc_file_reader_h__ */ diff --git a/libs/ardour/ltc_file_reader.cc b/libs/ardour/ltc_file_reader.cc new file mode 100644 index 0000000000..5f68a2d5ce --- /dev/null +++ b/libs/ardour/ltc_file_reader.cc @@ -0,0 +1,199 @@ +/* + Copyright (C) 2015 Robin Gareus + + 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 +#include + +#include +#include + +#include "pbd/error.h" +#include "pbd/failed_constructor.h" + +#include "timecode/time.h" +#include "ardour/ltc_file_reader.h" + +#include "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::read_ltc (uint32_t channel, uint32_t max_frames) +{ + std::vector 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; +} diff --git a/libs/ardour/wscript b/libs/ardour/wscript index 8ca25ebb38..af5b266987 100644 --- a/libs/ardour/wscript +++ b/libs/ardour/wscript @@ -106,6 +106,7 @@ libardour_sources = [ 'legatize.cc', 'location.cc', 'location_importer.cc', + 'ltc_file_reader.cc', 'ltc_slave.cc', 'meter.cc', 'midi_automation_list_binder.cc', -- cgit v1.2.3