1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257
|
/* 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.
*
*/
// Disable symbol overrides for FILE and fseek as those are used in the
// Vorbis headers.
#define FORBIDDEN_SYMBOL_EXCEPTION_FILE
#define FORBIDDEN_SYMBOL_EXCEPTION_fseek
#include "audio/decoders/vorbis.h"
#ifdef USE_VORBIS
#include "common/ptr.h"
#include "common/stream.h"
#include "common/textconsole.h"
#include "common/util.h"
#include "audio/audiostream.h"
#ifdef USE_TREMOR
#ifdef USE_TREMOLO
#include <tremolo/ivorbisfile.h>
#else
#include <tremor/ivorbisfile.h>
#endif
#else
#define OV_EXCLUDE_STATIC_CALLBACKS
#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 VorbisStream 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 VorbisStream : public SeekableAudioStream {
protected:
Common::DisposablePtr<Common::SeekableReadStream> _inStream;
bool _isStereo;
int _rate;
Timestamp _length;
OggVorbis_File _ovFile;
int16 _buffer[4096];
const int16 *_bufferEnd;
const int16 *_pos;
public:
// startTime / duration are in milliseconds
VorbisStream(Common::SeekableReadStream *inStream, DisposeAfterUse::Flag dispose);
~VorbisStream();
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();
};
VorbisStream::VorbisStream(Common::SeekableReadStream *inStream, DisposeAfterUse::Flag dispose) :
_inStream(inStream, dispose),
_length(0, 1000),
_bufferEnd(ARRAYEND(_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;
}
// Read in initial data
if (!refill())
return;
// Setup some header information
_isStereo = ov_info(&_ovFile, -1)->channels >= 2;
_rate = ov_info(&_ovFile, -1)->rate;
#ifdef USE_TREMOR
_length = Timestamp(ov_time_total(&_ovFile, -1), getRate());
#else
_length = Timestamp(uint32(ov_time_total(&_ovFile, -1) * 1000.0), getRate());
#endif
}
VorbisStream::~VorbisStream() {
ov_clear(&_ovFile);
}
int VorbisStream::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 VorbisStream::seek(const Timestamp &where) {
// Vorbisfile uses the sample pair number, thus we always use "false" for the isStereo parameter
// of the convertTimeToStreamPos helper.
int res = ov_pcm_seek(&_ovFile, convertTimeToStreamPos(where, getRate(), false).totalNumberOfFrames());
if (res) {
warning("Error seeking in Vorbis stream (%d)", res);
_pos = _bufferEnd;
return false;
}
return refill();
}
bool VorbisStream::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,
DisposeAfterUse::Flag disposeAfterUse) {
SeekableAudioStream *s = new VorbisStream(stream, disposeAfterUse);
if (s && s->endOfData()) {
delete s;
return 0;
} else {
return s;
}
}
} // End of namespace Audio
#endif // #ifdef USE_VORBIS
|