/*
Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
- This program is free software; you can redistribute it and/or modify
+ 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.
- This program is distributed in the hope that it will be useful,
+ 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 this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
+ along with libdcp. If not, see <http://www.gnu.org/licenses/>.
+
+ In addition, as a special exception, the copyright holders give
+ permission to link the code of portions of this program with the
+ OpenSSL library under certain conditions as described in each
+ individual source file, and distribute linked combinations
+ including the two.
+
+ You must obey the GNU General Public License in all respects
+ for all of the code used other than OpenSSL. If you modify
+ file(s) with this exception, you may extend this exception to your
+ version of the file(s), but you are not obligated to do so. If you
+ do not wish to do so, delete this exception statement from your
+ version. If you delete this exception statement from all source
+ files in the program, then also delete it here.
*/
#include "sound_asset_writer.h"
#include "compose.hpp"
#include "AS_DCP.h"
+using std::min;
+using std::max;
using namespace dcp;
struct SoundAssetWriter::ASDCPState
};
SoundAssetWriter::SoundAssetWriter (SoundAsset* asset, boost::filesystem::path file, Standard standard)
- : AssetWriter (asset, file)
+ : AssetWriter (asset, file, standard)
, _state (new SoundAssetWriter::ASDCPState)
, _sound_asset (asset)
, _frame_buffer_offset (0)
_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);
-
- 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);
+ _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) {
- int32_t const s = data[j][i] * (1 << 23);
+ /* 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;
void
SoundAssetWriter::write_current_frame ()
{
- ASDCP::Result_t const r = _state->mxf_writer.WriteFrame (_state->frame_buffer, _encryption_context, 0);
+ 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;
}
-void
+bool
SoundAssetWriter::finalize ()
{
if (_frame_buffer_offset > 0) {
write_current_frame ();
}
-
- if (ASDCP_FAILURE (_state->mxf_writer.Finalize())) {
+
+ if (_started && ASDCP_FAILURE (_state->mxf_writer.Finalize())) {
boost::throw_exception (MiscError ("could not finalise audio MXF"));
}
_sound_asset->_intrinsic_duration = _frames_written;
- AssetWriter::finalize ();
+ return AssetWriter::finalize ();
}