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/*
Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
This file is part of libdcp.
libdcp 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.
libdcp 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 libdcp. If not, see <http://www.gnu.org/licenses/>.
*/
#include "sound_asset_writer.h"
#include "sound_asset.h"
#include "exceptions.h"
#include "dcp_assert.h"
#include "compose.hpp"
#include "AS_DCP.h"
using std::min;
using std::max;
using namespace dcp;
struct SoundAssetWriter::ASDCPState
{
ASDCP::PCM::MXFWriter mxf_writer;
ASDCP::PCM::FrameBuffer frame_buffer;
ASDCP::WriterInfo writer_info;
ASDCP::PCM::AudioDescriptor audio_desc;
};
SoundAssetWriter::SoundAssetWriter (SoundAsset* asset, boost::filesystem::path file, Standard standard)
: AssetWriter (asset, file, standard)
, _state (new SoundAssetWriter::ASDCPState)
, _sound_asset (asset)
, _frame_buffer_offset (0)
{
/* Derived from ASDCP::Wav::SimpleWaveHeader::FillADesc */
_state->audio_desc.EditRate = ASDCP::Rational (_sound_asset->edit_rate().numerator, _sound_asset->edit_rate().denominator);
_state->audio_desc.AudioSamplingRate = ASDCP::Rational (_sound_asset->sampling_rate(), 1);
_state->audio_desc.Locked = 0;
_state->audio_desc.ChannelCount = _sound_asset->channels ();
_state->audio_desc.QuantizationBits = 24;
_state->audio_desc.BlockAlign = 3 * _sound_asset->channels();
_state->audio_desc.AvgBps = _sound_asset->sampling_rate() * _state->audio_desc.BlockAlign;
_state->audio_desc.LinkedTrackID = 0;
_state->audio_desc.ChannelFormat = ASDCP::PCM::CF_NONE;
_state->frame_buffer.Capacity (ASDCP::PCM::CalcFrameBufferSize (_state->audio_desc));
_state->frame_buffer.Size (ASDCP::PCM::CalcFrameBufferSize (_state->audio_desc));
memset (_state->frame_buffer.Data(), 0, _state->frame_buffer.Capacity());
_sound_asset->fill_writer_info (&_state->writer_info, _sound_asset->id(), standard);
}
void
SoundAssetWriter::write (float const * const * data, int frames)
{
DCP_ASSERT (!_finalized);
static float const clip = 1.0f - (1.0f / pow (2, 23));
if (!_started) {
Kumu::Result_t r = _state->mxf_writer.OpenWrite (_file.string().c_str(), _state->writer_info, _state->audio_desc);
if (ASDCP_FAILURE (r)) {
boost::throw_exception (FileError ("could not open audio MXF for writing", _file.string(), r));
}
_sound_asset->set_file (_file);
_started = true;
}
for (int i = 0; i < frames; ++i) {
byte_t* out = _state->frame_buffer.Data() + _frame_buffer_offset;
/* Write one sample per channel */
for (int j = 0; j < _sound_asset->channels(); ++j) {
/* Convert sample to 24-bit int, clipping if necessary. */
int32_t const s = min (clip, max (-clip, data[j][i])) * (1 << 23);
*out++ = (s & 0xff);
*out++ = (s & 0xff00) >> 8;
*out++ = (s & 0xff0000) >> 16;
}
_frame_buffer_offset += 3 * _sound_asset->channels();
DCP_ASSERT (_frame_buffer_offset <= int (_state->frame_buffer.Capacity()));
/* Finish the MXF frame if required */
if (_frame_buffer_offset == int (_state->frame_buffer.Capacity())) {
write_current_frame ();
_frame_buffer_offset = 0;
memset (_state->frame_buffer.Data(), 0, _state->frame_buffer.Capacity());
}
}
}
void
SoundAssetWriter::write_current_frame ()
{
ASDCP::Result_t const r = _state->mxf_writer.WriteFrame (_state->frame_buffer, _encryption_context, _hmac_context);
if (ASDCP_FAILURE (r)) {
boost::throw_exception (MiscError (String::compose ("could not write audio MXF frame (%1)", int (r))));
}
++_frames_written;
}
bool
SoundAssetWriter::finalize ()
{
if (_frame_buffer_offset > 0) {
write_current_frame ();
}
if (_started && ASDCP_FAILURE (_state->mxf_writer.Finalize())) {
boost::throw_exception (MiscError ("could not finalise audio MXF"));
}
_sound_asset->_intrinsic_duration = _frames_written;
return AssetWriter::finalize ();
}
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