sm64pc/tools/audiofile-0.3.6/libaudiofile/modules/G711.cpp

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2020-05-07 18:21:22 +00:00
/*
Audio File Library
Copyright (C) 2000-2001, Silicon Graphics, Inc.
Copyright (C) 2010-2013, Michael Pruett <michael@68k.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "G711.h"
#include <assert.h>
#include "Compiler.h"
#include "FileModule.h"
#include "Track.h"
#include "afinternal.h"
#include "audiofile.h"
#include "byteorder.h"
#include "compression.h"
#include "units.h"
#include "util.h"
#include "../g711.h"
static void ulaw2linear_buf (const uint8_t *ulaw, int16_t *linear, int nsamples)
{
for (int i=0; i < nsamples; i++)
linear[i] = _af_ulaw2linear(ulaw[i]);
}
static void linear2ulaw_buf (const int16_t *linear, uint8_t *ulaw, int nsamples)
{
for (int i=0; i < nsamples; i++)
ulaw[i] = _af_linear2ulaw(linear[i]);
}
static void alaw2linear_buf (const uint8_t *alaw, int16_t *linear, int nsamples)
{
for (int i=0; i < nsamples; i++)
linear[i] = _af_alaw2linear(alaw[i]);
}
static void linear2alaw_buf (const int16_t *linear, uint8_t *alaw, int nsamples)
{
for (int i=0; i < nsamples; i++)
alaw[i] = _af_linear2alaw(linear[i]);
}
bool _af_g711_format_ok (AudioFormat *f)
{
if (f->sampleFormat != AF_SAMPFMT_TWOSCOMP || f->sampleWidth != 16)
{
_af_error(AF_BAD_COMPRESSION,
"G.711 compression requires 16-bit signed integer format");
return false;
}
if (f->byteOrder != _AF_BYTEORDER_NATIVE)
{
_af_error(AF_BAD_COMPRESSION,
"G.711 compression requires native byte order");
return false;
}
return true;
}
class G711 : public FileModule
{
public:
static G711 *createCompress(Track *trk, File *fh, bool canSeek,
bool headerless, AFframecount *chunkframes);
static G711 *createDecompress(Track *trk, File *fh, bool canSeek,
bool headerless, AFframecount *chunkframes);
virtual const char *name() const OVERRIDE
{
return mode() == Compress ? "g711compress" : "g711decompress";
}
virtual void describe() OVERRIDE;
virtual void runPull() OVERRIDE;
virtual void reset2() OVERRIDE;
virtual void runPush() OVERRIDE;
virtual void sync1() OVERRIDE;
virtual void sync2() OVERRIDE;
private:
G711(Mode mode, Track *track, File *fh, bool canSeek);
AFfileoffset m_savedPositionNextFrame;
AFframecount m_savedNextFrame;
};
G711::G711(Mode mode, Track *track, File *fh, bool canSeek) :
FileModule(mode, track, fh, canSeek),
m_savedPositionNextFrame(-1),
m_savedNextFrame(-1)
{
if (mode == Decompress)
track->f.compressionParams = AU_NULL_PVLIST;
}
G711 *G711::createCompress(Track *track, File *fh,
bool canSeek, bool headerless, AFframecount *chunkframes)
{
return new G711(Compress, track, fh, canSeek);
}
void G711::runPush()
{
AFframecount framesToWrite = m_inChunk->frameCount;
AFframecount samplesToWrite = m_inChunk->frameCount * m_inChunk->f.channelCount;
int framesize = m_inChunk->f.channelCount;
assert(m_track->f.compressionType == AF_COMPRESSION_G711_ULAW ||
m_track->f.compressionType == AF_COMPRESSION_G711_ALAW);
/* Compress frames into i->outc. */
if (m_track->f.compressionType == AF_COMPRESSION_G711_ULAW)
linear2ulaw_buf(static_cast<const int16_t *>(m_inChunk->buffer),
static_cast<uint8_t *>(m_outChunk->buffer), samplesToWrite);
else
linear2alaw_buf(static_cast<const int16_t *>(m_inChunk->buffer),
static_cast<uint8_t *>(m_outChunk->buffer), samplesToWrite);
/* Write the compressed data. */
ssize_t bytesWritten = write(m_outChunk->buffer, framesize * framesToWrite);
AFframecount framesWritten = bytesWritten >= 0 ? bytesWritten / framesize : 0;
if (framesWritten != framesToWrite)
reportWriteError(framesWritten, framesToWrite);
m_track->nextfframe += framesWritten;
m_track->totalfframes = m_track->nextfframe;
assert(!canSeek() || (tell() == m_track->fpos_next_frame));
}
void G711::sync1()
{
m_savedPositionNextFrame = m_track->fpos_next_frame;
m_savedNextFrame = m_track->nextfframe;
}
void G711::sync2()
{
/* sanity check. */
assert(!canSeek() || (tell() == m_track->fpos_next_frame));
/* We can afford to do an lseek just in case because sync2 is rare. */
m_track->fpos_after_data = tell();
m_track->fpos_next_frame = m_savedPositionNextFrame;
m_track->nextfframe = m_savedNextFrame;
}
void G711::describe()
{
if (mode() == Compress)
{
m_outChunk->f.compressionType = m_track->f.compressionType;
}
else
{
m_outChunk->f.byteOrder = _AF_BYTEORDER_NATIVE;
m_outChunk->f.compressionType = AF_COMPRESSION_NONE;
}
}
G711 *G711::createDecompress(Track *track, File *fh,
bool canSeek, bool headerless, AFframecount *chunkframes)
{
return new G711(Decompress, track, fh, canSeek);
}
void G711::runPull()
{
AFframecount framesToRead = m_outChunk->frameCount;
AFframecount samplesToRead = m_outChunk->frameCount * m_outChunk->f.channelCount;
int framesize = m_outChunk->f.channelCount;
/* Read the compressed frames. */
ssize_t bytesRead = read(m_inChunk->buffer, framesize * framesToRead);
AFframecount framesRead = bytesRead >= 0 ? bytesRead / framesize : 0;
/* Decompress into i->outc. */
if (m_track->f.compressionType == AF_COMPRESSION_G711_ULAW)
ulaw2linear_buf(static_cast<const uint8_t *>(m_inChunk->buffer),
static_cast<int16_t *>(m_outChunk->buffer), samplesToRead);
else
alaw2linear_buf(static_cast<const uint8_t *>(m_inChunk->buffer),
static_cast<int16_t *>(m_outChunk->buffer), samplesToRead);
m_track->nextfframe += framesRead;
assert(!canSeek() || (tell() == m_track->fpos_next_frame));
/*
If we got EOF from read, then we return the actual amount read.
Complain only if there should have been more frames in the file.
*/
if (m_track->totalfframes != -1 && framesRead != framesToRead)
reportReadError(framesRead, framesToRead);
m_outChunk->frameCount = framesRead;
}
void G711::reset2()
{
int framesize = m_inChunk->f.channelCount;
m_track->fpos_next_frame = m_track->fpos_first_frame +
framesize * m_track->nextfframe;
m_track->frames2ignore = 0;
}
FileModule *_AFg711initcompress(Track *track, File *fh, bool canSeek,
bool headerless, AFframecount *chunkFrames)
{
return G711::createCompress(track, fh, canSeek, headerless, chunkFrames);
}
FileModule *_AFg711initdecompress(Track *track, File *fh, bool canSeek,
bool headerless, AFframecount *chunkFrames)
{
return G711::createDecompress(track, fh, canSeek, headerless, chunkFrames);
}