2 Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
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.
20 #include "sound_asset_writer.h"
21 #include "sound_asset.h"
22 #include "exceptions.h"
23 #include "dcp_assert.h"
24 #include "compose.hpp"
29 struct SoundAssetWriter::ASDCPState
31 ASDCP::PCM::MXFWriter mxf_writer;
32 ASDCP::PCM::FrameBuffer frame_buffer;
33 ASDCP::WriterInfo writer_info;
34 ASDCP::PCM::AudioDescriptor audio_desc;
37 SoundAssetWriter::SoundAssetWriter (SoundAsset* asset, boost::filesystem::path file, Standard standard)
38 : AssetWriter (asset, file)
39 , _state (new SoundAssetWriter::ASDCPState)
40 , _sound_asset (asset)
41 , _frame_buffer_offset (0)
43 /* Derived from ASDCP::Wav::SimpleWaveHeader::FillADesc */
44 _state->audio_desc.EditRate = ASDCP::Rational (_sound_asset->edit_rate().numerator, _sound_asset->edit_rate().denominator);
45 _state->audio_desc.AudioSamplingRate = ASDCP::Rational (_sound_asset->sampling_rate(), 1);
46 _state->audio_desc.Locked = 0;
47 _state->audio_desc.ChannelCount = _sound_asset->channels ();
48 _state->audio_desc.QuantizationBits = 24;
49 _state->audio_desc.BlockAlign = 3 * _sound_asset->channels();
50 _state->audio_desc.AvgBps = _sound_asset->sampling_rate() * _state->audio_desc.BlockAlign;
51 _state->audio_desc.LinkedTrackID = 0;
52 _state->audio_desc.ChannelFormat = ASDCP::PCM::CF_NONE;
54 _state->frame_buffer.Capacity (ASDCP::PCM::CalcFrameBufferSize (_state->audio_desc));
55 _state->frame_buffer.Size (ASDCP::PCM::CalcFrameBufferSize (_state->audio_desc));
56 memset (_state->frame_buffer.Data(), 0, _state->frame_buffer.Capacity());
58 _sound_asset->fill_writer_info (&_state->writer_info, _sound_asset->id(), standard);
60 Kumu::Result_t r = _state->mxf_writer.OpenWrite (file.string().c_str(), _state->writer_info, _state->audio_desc);
61 if (ASDCP_FAILURE (r)) {
62 boost::throw_exception (FileError ("could not open audio MXF for writing", file.string(), r));
65 _sound_asset->set_file (file);
69 SoundAssetWriter::write (float const * const * data, int frames)
71 DCP_ASSERT (!_finalized);
73 for (int i = 0; i < frames; ++i) {
75 byte_t* out = _state->frame_buffer.Data() + _frame_buffer_offset;
77 /* Write one sample per channel */
78 for (int j = 0; j < _sound_asset->channels(); ++j) {
79 int32_t const s = data[j][i] * (1 << 23);
81 *out++ = (s & 0xff00) >> 8;
82 *out++ = (s & 0xff0000) >> 16;
84 _frame_buffer_offset += 3 * _sound_asset->channels();
86 DCP_ASSERT (_frame_buffer_offset <= int (_state->frame_buffer.Capacity()));
88 /* Finish the MXF frame if required */
89 if (_frame_buffer_offset == int (_state->frame_buffer.Capacity())) {
90 write_current_frame ();
91 _frame_buffer_offset = 0;
92 memset (_state->frame_buffer.Data(), 0, _state->frame_buffer.Capacity());
98 SoundAssetWriter::write_current_frame ()
100 ASDCP::Result_t const r = _state->mxf_writer.WriteFrame (_state->frame_buffer, _encryption_context, 0);
101 if (ASDCP_FAILURE (r)) {
102 boost::throw_exception (MiscError (String::compose ("could not write audio MXF frame (%1)", int (r))));
109 SoundAssetWriter::finalize ()
111 if (_frame_buffer_offset > 0) {
112 write_current_frame ();
115 if (ASDCP_FAILURE (_state->mxf_writer.Finalize())) {
116 boost::throw_exception (MiscError ("could not finalise audio MXF"));
119 _sound_asset->_intrinsic_duration = _frames_written;
120 AssetWriter::finalize ();