2005-01-09 15:49:43 +00:00
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/* ScummVM - Scumm Interpreter
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2005-01-09 16:14:56 +00:00
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* Copyright (C) 2005 The ScummVM project
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2005-01-09 15:49:43 +00:00
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "stdafx.h"
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#include "common/util.h"
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#include "common/stream.h"
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#include "sound/audiostream.h"
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#include "sound/mixer.h"
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#include "sound/wave.h"
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2005-05-03 22:12:23 +00:00
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#include "sound/adpcm.h"
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2005-01-09 15:49:43 +00:00
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2005-05-03 22:12:23 +00:00
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bool loadWAVFromStream(Common::SeekableReadStream &stream, int &size, int &rate, byte &flags, uint16 *wavType) {
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2005-01-09 15:49:43 +00:00
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const uint32 initialPos = stream.pos();
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byte buf[4+1];
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buf[4] = 0;
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stream.read(buf, 4);
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if (memcmp(buf, "RIFF", 4) != 0) {
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warning("getWavInfo: No 'RIFF' header");
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return false;
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}
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uint32 wavLength = stream.readUint32LE();
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stream.read(buf, 4);
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if (memcmp(buf, "WAVE", 4) != 0) {
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warning("getWavInfo: No 'WAVE' header");
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return false;
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}
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stream.read(buf, 4);
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if (memcmp(buf, "fmt ", 4) != 0) {
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warning("getWavInfo: No 'fmt' header");
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return false;
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}
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uint32 fmtLength = stream.readUint32LE();
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if (fmtLength < 16) {
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// A valid fmt chunk always contains at least 16 bytes
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warning("getWavInfo: 'fmt' header is too short");
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return false;
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}
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// Next comes the "type" field of the fmt header. Some typical
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// values for it:
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2005-05-03 22:12:23 +00:00
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// 1 -> uncompressed PCM
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// 17 -> IMA ADPCM compressed WAVE
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2005-05-04 01:57:03 +00:00
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// See <http://www.saettler.com/RIFFNEW/RIFFNEW.htm> for a more complete
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2005-01-09 15:49:43 +00:00
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// list of common WAVE compression formats...
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uint16 type = stream.readUint16LE(); // == 1 for PCM data
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uint16 numChannels = stream.readUint16LE(); // 1 for mono, 2 for stereo
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uint32 samplesPerSec = stream.readUint32LE(); // in Hz
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uint32 avgBytesPerSec = stream.readUint32LE(); // == SampleRate * NumChannels * BitsPerSample/8
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uint16 blockAlign = stream.readUint16LE(); // == NumChannels * BitsPerSample/8
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uint16 bitsPerSample = stream.readUint16LE(); // 8, 16 ...
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// 8 bit data is unsigned, 16 bit data signed
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2005-05-03 22:12:23 +00:00
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if (wavType != 0)
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*wavType = type;
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2005-01-09 15:49:43 +00:00
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#if 0
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printf("WAVE information:\n");
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printf(" total size: %d\n", wavLength);
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printf(" fmt size: %d\n", fmtLength);
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printf(" type: %d\n", type);
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printf(" numChannels: %d\n", numChannels);
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printf(" samplesPerSec: %d\n", samplesPerSec);
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printf(" avgBytesPerSec: %d\n", avgBytesPerSec);
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printf(" blockAlign: %d\n", blockAlign);
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printf(" bitsPerSample: %d\n", bitsPerSample);
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#endif
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2005-05-03 22:12:23 +00:00
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if (type != 1 && type != 17) {
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warning("getWavInfo: only PCM or IMA ADPCM data is supported (type %d)", type);
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2005-01-09 15:49:43 +00:00
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return false;
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}
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if (blockAlign != numChannels * bitsPerSample / 8) {
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debug(0, "getWavInfo: blockAlign is invalid");
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}
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if (avgBytesPerSec != samplesPerSec * blockAlign) {
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debug(0, "getWavInfo: avgBytesPerSec is invalid");
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}
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// Prepare the return values.
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rate = samplesPerSec;
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flags = 0;
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if (bitsPerSample == 8) // 8 bit data is unsigned
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2005-05-10 23:48:48 +00:00
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flags |= Audio::Mixer::FLAG_UNSIGNED;
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2005-01-11 08:30:28 +00:00
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else if (bitsPerSample == 16) // 16 bit data is signed little endian
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2005-05-10 23:48:48 +00:00
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flags |= (Audio::Mixer::FLAG_16BITS | Audio::Mixer::FLAG_LITTLE_ENDIAN);
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2005-05-04 01:57:03 +00:00
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else if (bitsPerSample == 4 && type == 17) // IMA ADPCM compressed. We decompress it
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2005-05-10 23:48:48 +00:00
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flags |= (Audio::Mixer::FLAG_16BITS | Audio::Mixer::FLAG_LITTLE_ENDIAN);
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2005-01-09 15:49:43 +00:00
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else {
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warning("getWavInfo: unsupported bitsPerSample %d", bitsPerSample);
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return false;
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}
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if (numChannels == 2)
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2005-05-10 23:48:48 +00:00
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flags |= Audio::Mixer::FLAG_STEREO;
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2005-01-09 15:49:43 +00:00
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else if (numChannels != 1) {
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warning("getWavInfo: unsupported number of channels %d", numChannels);
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return false;
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}
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// It's almost certainly a WAV file, but we still need to find its
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// 'data' chunk.
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// Skip over the rest of the fmt chunk.
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int offset = fmtLength - 16;
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do {
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stream.seek(offset, SEEK_CUR);
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if (stream.pos() >= initialPos + wavLength + 8) {
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warning("getWavInfo: Can't find 'data' chunk");
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return false;
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}
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stream.read(buf, 4);
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offset = stream.readUint32LE();
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#if 0
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printf(" found a '%s' tag of size %d\n", buf, offset);
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#endif
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} while (memcmp(buf, "data", 4) != 0);
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// Stream now points at 'offset' bytes of sample data...
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size = offset;
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return true;
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}
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AudioStream *makeWAVStream(Common::SeekableReadStream &stream) {
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int size, rate;
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byte flags;
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2005-05-03 22:12:23 +00:00
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uint16 type;
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2005-01-09 15:49:43 +00:00
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2005-05-03 22:12:23 +00:00
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if (!loadWAVFromStream(stream, size, rate, flags, &type))
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2005-01-09 15:49:43 +00:00
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return 0;
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2005-05-03 22:12:23 +00:00
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if (type == 17) // IMA ADPCM
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return makeADPCMStream(stream, size, kADPCMIma);
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2005-01-09 15:49:43 +00:00
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byte *data = (byte *)malloc(size);
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assert(data);
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stream.read(data, size);
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2005-05-10 23:48:48 +00:00
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flags |= Audio::Mixer::FLAG_AUTOFREE;
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2005-01-09 15:49:43 +00:00
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return makeLinearInputStream(rate, flags, data, size, 0, 0);
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}
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