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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.
*
*/
/*
* The code in this file is based on information found at
* http://www.borg.com/~jglatt/tech/aiff.htm
*
* Also partially based on libav's aiffdec.c
*/
#include "common/debug.h"
#include "common/endian.h"
#include "common/stream.h"
#include "common/substream.h"
#include "common/textconsole.h"
#include "audio/audiostream.h"
#include "audio/decoders/aiff.h"
#include "audio/decoders/raw.h"
#include "audio/decoders/3do.h"
namespace Audio {
uint32 readExtended(Common::SeekableReadStream &stream) {
// The sample rate is stored as an "80 bit IEEE Standard 754 floating
// point number (Standard Apple Numeric Environment [SANE] data type
// Extended).
byte buf[10];
uint32 mantissa;
uint32 last = 0;
byte exp;
stream.read(buf, 10);
mantissa = READ_BE_UINT32(buf + 2);
exp = 30 - buf[1];
while (exp--) {
last = mantissa;
mantissa >>= 1;
}
if (last & 0x00000001)
mantissa++;
return mantissa;
}
// AIFF versions
static const uint32 kVersionAIFF = MKTAG('A', 'I', 'F', 'F');
static const uint32 kVersionAIFC = MKTAG('A', 'I', 'F', 'C');
// Codecs
static const uint32 kCodecPCM = MKTAG('N', 'O', 'N', 'E'); // very original
RewindableAudioStream *makeAIFFStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse) {
if (stream->readUint32BE() != MKTAG('F', 'O', 'R', 'M')) {
warning("makeAIFFStream: No 'FORM' header");
if (disposeAfterUse == DisposeAfterUse::YES)
delete stream;
return 0;
}
stream->readUint32BE(); // file size
uint32 version = stream->readUint32BE();
if (version != kVersionAIFF && version != kVersionAIFC) {
warning("makeAIFFStream: No 'AIFF' or 'AIFC' header");
if (disposeAfterUse == DisposeAfterUse::YES)
delete stream;
return 0;
}
// From here on, we only care about the COMM and SSND chunks, which are
// the only required chunks.
bool foundCOMM = false;
bool foundSSND = false;
uint16 channels = 0, bitsPerSample = 0;
uint32 blockAlign = 0, rate = 0;
uint32 codec = kCodecPCM; // AIFF default
Common::SeekableReadStream *dataStream = 0;
while (!(foundCOMM && foundSSND) && !stream->err() && !stream->eos()) {
uint32 tag = stream->readUint32BE();
uint32 length = stream->readUint32BE();
uint32 pos = stream->pos();
if (stream->eos() || stream->err())
break;
switch (tag) {
case MKTAG('C', 'O', 'M', 'M'):
foundCOMM = true;
channels = stream->readUint16BE();
/* frameCount = */ stream->readUint32BE();
bitsPerSample = stream->readUint16BE();
rate = readExtended(*stream);
if (version == kVersionAIFC)
codec = stream->readUint32BE();
break;
case MKTAG('S', 'S', 'N', 'D'):
foundSSND = true;
/* uint32 offset = */ stream->readUint32BE();
blockAlign = stream->readUint32BE();
dataStream = new Common::SeekableSubReadStream(stream, stream->pos(), stream->pos() + length - 8, disposeAfterUse);
break;
case MKTAG('F', 'V', 'E', 'R'):
switch (stream->readUint32BE()) {
case 0:
version = kVersionAIFF;
break;
case 0xA2805140:
version = kVersionAIFC;
break;
default:
warning("Unknown AIFF version chunk version");
break;
}
break;
case MKTAG('w', 'a', 'v', 'e'):
warning("Found unhandled AIFF-C extra data chunk");
if (!dataStream && disposeAfterUse == DisposeAfterUse::YES)
delete stream;
delete dataStream;
return 0;
default:
debug(1, "Skipping AIFF '%s' chunk", tag2str(tag));
break;
}
stream->seek(pos + length + (length & 1)); // ensure we're also word-aligned
}
if (!foundCOMM) {
warning("makeAIFFStream: Cound not find 'COMM' chunk");
if (!dataStream && disposeAfterUse == DisposeAfterUse::YES)
delete stream;
delete dataStream;
return 0;
}
if (!foundSSND) {
warning("makeAIFFStream: Cound not find 'SSND' chunk");
if (disposeAfterUse == DisposeAfterUse::YES)
delete stream;
return 0;
}
// We only implement a subset of the AIFF standard.
if (channels < 1 || channels > 2) {
warning("makeAIFFStream: Only 1 or 2 channels are supported, not %d", channels);
delete dataStream;
return 0;
}
// Seek to the start of dataStream, required for at least FileStream
dataStream->seek(0);
switch (codec) {
case kCodecPCM:
case MKTAG('t', 'w', 'o', 's'):
case MKTAG('s', 'o', 'w', 't'): {
// PCM samples are always signed.
byte rawFlags = 0;
if (bitsPerSample == 16)
rawFlags |= Audio::FLAG_16BITS;
if (channels == 2)
rawFlags |= Audio::FLAG_STEREO;
if (codec == MKTAG('s', 'o', 'w', 't'))
rawFlags |= Audio::FLAG_LITTLE_ENDIAN;
return makeRawStream(dataStream, rate, rawFlags);
}
case MKTAG('i', 'm', 'a', '4'):
// TODO: Use QT IMA ADPCM
warning("Unhandled AIFF-C QT IMA ADPCM compression");
break;
case MKTAG('Q', 'D', 'M', '2'):
// TODO: Need to figure out how to integrate this
// (But hopefully never needed)
warning("Unhandled AIFF-C QDM2 compression");
break;
case MKTAG('A', 'D', 'P', '4'):
// ADP4 on 3DO
return make3DO_ADP4AudioStream(dataStream, rate, channels == 2);
case MKTAG('S', 'D', 'X', '2'):
// SDX2 on 3DO
return make3DO_SDX2AudioStream(dataStream, rate, channels == 2);
default:
warning("Unhandled AIFF-C compression tag '%s'", tag2str(codec));
}
delete dataStream;
return 0;
}
} // End of namespace Audio
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