mirror of
https://github.com/libretro/scummvm.git
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182 lines
4.7 KiB
C++
182 lines
4.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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/*
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* The code in this file is based on information found at
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* http://www.borg.com/~jglatt/tech/aiff.htm
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*
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* We currently only implement uncompressed AIFF. If we ever need AIFF-C, SoX
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* (http://sox.sourceforge.net) may be a good place to start from.
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*/
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#include "common/endian.h"
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#include "common/stream.h"
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#include "common/textconsole.h"
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#include "audio/decoders/aiff.h"
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#include "audio/decoders/raw.h"
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namespace Audio {
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uint32 readExtended(Common::SeekableReadStream &stream) {
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// The sample rate is stored as an "80 bit IEEE Standard 754 floating
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// point number (Standard Apple Numeric Environment [SANE] data type
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// Extended).
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byte buf[10];
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uint32 mantissa;
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uint32 last = 0;
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byte exp;
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stream.read(buf, 10);
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mantissa = READ_BE_UINT32(buf + 2);
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exp = 30 - buf[1];
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while (exp--) {
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last = mantissa;
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mantissa >>= 1;
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}
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if (last & 0x00000001)
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mantissa++;
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return mantissa;
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}
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bool loadAIFFFromStream(Common::SeekableReadStream &stream, int &size, int &rate, byte &flags) {
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byte buf[4];
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stream.read(buf, 4);
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if (memcmp(buf, "FORM", 4) != 0) {
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warning("loadAIFFFromStream: No 'FORM' header");
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return false;
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}
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stream.readUint32BE();
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// This could be AIFC, but we don't handle that case.
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stream.read(buf, 4);
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if (memcmp(buf, "AIFF", 4) != 0) {
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warning("loadAIFFFromStream: No 'AIFF' header");
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return false;
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}
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// From here on, we only care about the COMM and SSND chunks, which are
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// the only required chunks.
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bool foundCOMM = false;
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bool foundSSND = false;
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uint16 numChannels = 0, bitsPerSample = 0;
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uint32 numSampleFrames = 0, offset = 0, blockSize = 0, soundOffset = 0;
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while (!(foundCOMM && foundSSND) && !stream.err() && !stream.eos()) {
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uint32 length, pos;
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stream.read(buf, 4);
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length = stream.readUint32BE();
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pos = stream.pos();
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if (memcmp(buf, "COMM", 4) == 0) {
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foundCOMM = true;
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numChannels = stream.readUint16BE();
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numSampleFrames = stream.readUint32BE();
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bitsPerSample = stream.readUint16BE();
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rate = readExtended(stream);
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size = numSampleFrames * numChannels * (bitsPerSample / 8);
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} else if (memcmp(buf, "SSND", 4) == 0) {
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foundSSND = true;
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offset = stream.readUint32BE();
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blockSize = stream.readUint32BE();
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soundOffset = stream.pos();
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}
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stream.seek(pos + length);
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}
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if (!foundCOMM) {
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warning("loadAIFFFromStream: Cound not find 'COMM' chunk");
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return false;
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}
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if (!foundSSND) {
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warning("loadAIFFFromStream: Cound not find 'SSND' chunk");
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return false;
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}
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// We only implement a subset of the AIFF standard.
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if (numChannels < 1 || numChannels > 2) {
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warning("loadAIFFFromStream: Only 1 or 2 channels are supported, not %d", numChannels);
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return false;
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}
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if (bitsPerSample != 8 && bitsPerSample != 16) {
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warning("loadAIFFFromStream: Only 8 or 16 bits per sample are supported, not %d", bitsPerSample);
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return false;
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}
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if (offset != 0 || blockSize != 0) {
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warning("loadAIFFFromStream: Block-aligned data is not supported");
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return false;
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}
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// Samples are always signed, and big endian.
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flags = 0;
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if (bitsPerSample == 16)
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flags |= Audio::FLAG_16BITS;
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if (numChannels == 2)
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flags |= Audio::FLAG_STEREO;
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stream.seek(soundOffset);
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// Stream now points at the sample data
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return true;
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}
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SeekableAudioStream *makeAIFFStream(Common::SeekableReadStream *stream,
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DisposeAfterUse::Flag disposeAfterUse) {
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int size, rate;
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byte *data, flags;
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if (!loadAIFFFromStream(*stream, size, rate, flags)) {
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if (disposeAfterUse == DisposeAfterUse::YES)
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delete stream;
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return 0;
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}
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data = (byte *)malloc(size);
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assert(data);
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stream->read(data, size);
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if (disposeAfterUse == DisposeAfterUse::YES)
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delete stream;
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// Since we allocated our own buffer for the data, we must specify DisposeAfterUse::YES.
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return makeRawStream(data, size, rate, flags);
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}
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} // End of namespace Audio
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