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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "sound/vorbis.h"
#ifdef USE_VORBIS
#include "common/debug.h"
#include "common/stream.h"
#include "common/util.h"
#include "sound/audiostream.h"
#include "sound/audiocd.h"
#ifdef USE_TREMOR
#ifdef __GP32__ // GP32 uses custom libtremor
#include <ivorbisfile.h>
#else
#include <tremor/ivorbisfile.h>
#endif
#else
#include <vorbis/vorbisfile.h>
#endif
namespace Audio {
// These are wrapper functions to allow using a SeekableReadStream object to
// provide data to the OggVorbis_File object.
static size_t read_stream_wrap(void *ptr, size_t size, size_t nmemb, void *datasource) {
Common::SeekableReadStream *stream = (Common::SeekableReadStream *)datasource;
uint32 result = stream->read(ptr, size * nmemb);
return result / size;
}
static int seek_stream_wrap(void *datasource, ogg_int64_t offset, int whence) {
Common::SeekableReadStream *stream = (Common::SeekableReadStream *)datasource;
stream->seek((int32)offset, whence);
return stream->pos();
}
static int close_stream_wrap(void *datasource) {
// Do nothing -- we leave it up to the VorbisInputStream to free memory as appropriate.
return 0;
}
static long tell_stream_wrap(void *datasource) {
Common::SeekableReadStream *stream = (Common::SeekableReadStream *)datasource;
return stream->pos();
}
static ov_callbacks g_stream_wrap = {
read_stream_wrap, seek_stream_wrap, close_stream_wrap, tell_stream_wrap
};
#pragma mark -
#pragma mark --- Ogg Vorbis stream ---
#pragma mark -
class VorbisInputStream : public SeekableAudioStream {
protected:
Common::SeekableReadStream *_inStream;
bool _disposeAfterUse;
bool _isStereo;
int _rate;
Timestamp _length;
OggVorbis_File _ovFile;
int16 _buffer[4096];
const int16 *_bufferEnd;
const int16 *_pos;
public:
// startTime / duration are in milliseconds
VorbisInputStream(Common::SeekableReadStream *inStream, bool dispose);
~VorbisInputStream();
int readBuffer(int16 *buffer, const int numSamples);
bool endOfData() const { return _pos >= _bufferEnd; }
bool isStereo() const { return _isStereo; }
int getRate() const { return _rate; }
bool seek(const Timestamp &where);
Timestamp getLength() const { return _length; }
protected:
bool refill();
};
VorbisInputStream::VorbisInputStream(Common::SeekableReadStream *inStream, bool dispose) :
_inStream(inStream),
_disposeAfterUse(dispose),
_length(0, 1000),
_bufferEnd(_buffer + ARRAYSIZE(_buffer)) {
int res = ov_open_callbacks(inStream, &_ovFile, NULL, 0, g_stream_wrap);
if (res < 0) {
warning("Could not create Vorbis stream (%d)", res);
_pos = _bufferEnd;
return;
}
#ifdef USE_TREMOR
_length = Timestamp(ov_time_total(&_ovFile, -1), getRate());
#else
_length = Timestamp(uint32(ov_time_total(&_ovFile, -1) * 1000.0), getRate());
#endif
// Read in initial data
if (!refill())
return;
// Setup some header information
_isStereo = ov_info(&_ovFile, -1)->channels >= 2;
_rate = ov_info(&_ovFile, -1)->rate;
}
VorbisInputStream::~VorbisInputStream() {
ov_clear(&_ovFile);
if (_disposeAfterUse)
delete _inStream;
}
int VorbisInputStream::readBuffer(int16 *buffer, const int numSamples) {
int samples = 0;
while (samples < numSamples && _pos < _bufferEnd) {
const int len = MIN(numSamples - samples, (int)(_bufferEnd - _pos));
memcpy(buffer, _pos, len * 2);
buffer += len;
_pos += len;
samples += len;
if (_pos >= _bufferEnd) {
if (!refill())
break;
}
}
return samples;
}
bool VorbisInputStream::seek(const Timestamp &where) {
int res = ov_pcm_seek(&_ovFile, calculateSampleOffset(where, getRate()));
if (res) {
warning("Error seeking in Vorbis stream (%d)", res);
_pos = _bufferEnd;
return false;
}
return refill();
}
bool VorbisInputStream::refill() {
// Read the samples
uint len_left = sizeof(_buffer);
char *read_pos = (char *)_buffer;
while (len_left > 0) {
long result;
#ifdef USE_TREMOR
// Tremor ov_read() always returns data as signed 16 bit interleaved PCM
// in host byte order. As such, it does not take arguments to request
// specific signedness, byte order or bit depth as in Vorbisfile.
result = ov_read(&_ovFile, read_pos, len_left,
NULL);
#else
#ifdef SCUMM_BIG_ENDIAN
result = ov_read(&_ovFile, read_pos, len_left,
1,
2, // 16 bit
1, // signed
NULL);
#else
result = ov_read(&_ovFile, read_pos, len_left,
0,
2, // 16 bit
1, // signed
NULL);
#endif
#endif
if (result == OV_HOLE) {
// Possibly recoverable, just warn about it
warning("Corrupted data in Vorbis file");
} else if (result == 0) {
//warning("End of file while reading from Vorbis file");
//_pos = _bufferEnd;
//return false;
break;
} else if (result < 0) {
warning("Error reading from Vorbis stream (%d)", int(result));
_pos = _bufferEnd;
// Don't delete it yet, that causes problems in
// the CD player emulation code.
return false;
} else {
len_left -= result;
read_pos += result;
}
}
_pos = _buffer;
_bufferEnd = (int16 *)read_pos;
return true;
}
#pragma mark -
#pragma mark --- Ogg Vorbis factory functions ---
#pragma mark -
SeekableAudioStream *makeVorbisStream(
Common::SeekableReadStream *stream,
bool disposeAfterUse) {
return new VorbisInputStream(stream, disposeAfterUse);
}
} // End of namespace Audio
#endif // #ifdef USE_VORBIS
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