mirror of
https://github.com/scummvm/scummvm.git
synced 2026-06-20 05:45:29 +00:00
Colin Snover
e6228f3ff6
Due to the need to calculate the audio duration with millisecond precision from the file size, it is possible to overflow a 32-bit integer in games with long background audio loops, like RAMA, during the calculation of the duration. It is also not necessary to give some framerate here, so eliminate the unnecessary explicit Timestamp construction with the second argument.
288 lines
10 KiB
C++
288 lines
10 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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*
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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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*
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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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#include "audio/audiostream.h"
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#include "audio/rate.h"
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#include "audio/decoders/raw.h"
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#include "common/substream.h"
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#include "common/util.h"
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#include "sci/sci.h"
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#include "sci/sound/decoders/sol.h"
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#include "sci/resource.h"
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namespace Sci {
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// Note that the 16-bit version is also used in coktelvideo.cpp
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static const uint16 tableDPCM16[128] = {
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0x0000, 0x0008, 0x0010, 0x0020, 0x0030, 0x0040, 0x0050, 0x0060, 0x0070, 0x0080,
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0x0090, 0x00A0, 0x00B0, 0x00C0, 0x00D0, 0x00E0, 0x00F0, 0x0100, 0x0110, 0x0120,
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0x0130, 0x0140, 0x0150, 0x0160, 0x0170, 0x0180, 0x0190, 0x01A0, 0x01B0, 0x01C0,
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0x01D0, 0x01E0, 0x01F0, 0x0200, 0x0208, 0x0210, 0x0218, 0x0220, 0x0228, 0x0230,
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0x0238, 0x0240, 0x0248, 0x0250, 0x0258, 0x0260, 0x0268, 0x0270, 0x0278, 0x0280,
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0x0288, 0x0290, 0x0298, 0x02A0, 0x02A8, 0x02B0, 0x02B8, 0x02C0, 0x02C8, 0x02D0,
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0x02D8, 0x02E0, 0x02E8, 0x02F0, 0x02F8, 0x0300, 0x0308, 0x0310, 0x0318, 0x0320,
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0x0328, 0x0330, 0x0338, 0x0340, 0x0348, 0x0350, 0x0358, 0x0360, 0x0368, 0x0370,
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0x0378, 0x0380, 0x0388, 0x0390, 0x0398, 0x03A0, 0x03A8, 0x03B0, 0x03B8, 0x03C0,
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0x03C8, 0x03D0, 0x03D8, 0x03E0, 0x03E8, 0x03F0, 0x03F8, 0x0400, 0x0440, 0x0480,
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0x04C0, 0x0500, 0x0540, 0x0580, 0x05C0, 0x0600, 0x0640, 0x0680, 0x06C0, 0x0700,
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0x0740, 0x0780, 0x07C0, 0x0800, 0x0900, 0x0A00, 0x0B00, 0x0C00, 0x0D00, 0x0E00,
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0x0F00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000
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};
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static const byte tableDPCM8[8] = { 0, 1, 2, 3, 6, 10, 15, 21 };
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/**
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* Decompresses one channel of 16-bit DPCM compressed audio.
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*/
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static void deDPCM16Channel(int16 *out, int16 &sample, uint8 delta) {
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int32 nextSample = sample;
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if (delta & 0x80) {
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nextSample -= tableDPCM16[delta & 0x7f];
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} else {
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nextSample += tableDPCM16[delta];
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}
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// Emulating x86 16-bit signed register overflow
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if (nextSample > 32767) {
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nextSample -= 65536;
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} else if (nextSample < -32768) {
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nextSample += 65536;
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}
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*out = sample = nextSample;
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}
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/**
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* Decompresses 16-bit DPCM compressed audio. Each byte read
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* outputs one sample into the decompression buffer.
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*/
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static void deDPCM16Mono(int16 *out, Common::ReadStream &audioStream, const uint32 numBytes, int16 &sample) {
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for (uint32 i = 0; i < numBytes; ++i) {
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const uint8 delta = audioStream.readByte();
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deDPCM16Channel(out++, sample, delta);
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}
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}
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// Used by Robot
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void deDPCM16Mono(int16 *out, const byte *in, const uint32 numBytes, int16 &sample) {
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for (uint32 i = 0; i < numBytes; ++i) {
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const uint8 delta = *in++;
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deDPCM16Channel(out++, sample, delta);
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}
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}
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static void deDPCM16Stereo(int16 *out, Common::ReadStream &audioStream, const uint32 numBytes, int16 &sampleL, int16 &sampleR) {
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assert((numBytes % 2) == 0);
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for (uint32 i = 0; i < numBytes / 2; ++i) {
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deDPCM16Channel(out++, sampleL, audioStream.readByte());
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deDPCM16Channel(out++, sampleR, audioStream.readByte());
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}
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}
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/**
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* Decompresses one half of an 8-bit DPCM compressed audio
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* byte.
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*/
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template <bool OLD>
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static void deDPCM8Nibble(int16 *out, uint8 &sample, uint8 delta) {
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const uint8 lastSample = sample;
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if (delta & 8) {
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sample -= tableDPCM8[OLD ? (7 - (delta & 7)) : (delta & 7)];
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} else {
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sample += tableDPCM8[delta & 7];
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}
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*out = ((lastSample + sample) << 7) ^ 0x8000;
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}
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/**
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* Decompresses 8-bit DPCM compressed audio. Each byte read
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* outputs two samples into the decompression buffer.
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*/
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template <bool OLD>
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static void deDPCM8Mono(int16 *out, Common::ReadStream &audioStream, uint32 numBytes, uint8 &sample) {
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for (uint32 i = 0; i < numBytes; ++i) {
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const uint8 delta = audioStream.readByte();
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deDPCM8Nibble<OLD>(out++, sample, delta >> 4);
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deDPCM8Nibble<OLD>(out++, sample, delta & 0xf);
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}
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}
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static void deDPCM8Stereo(int16 *out, Common::ReadStream &audioStream, uint32 numBytes, uint8 &sampleL, uint8 &sampleR) {
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for (uint32 i = 0; i < numBytes; ++i) {
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const uint8 delta = audioStream.readByte();
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deDPCM8Nibble<false>(out++, sampleL, delta >> 4);
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deDPCM8Nibble<false>(out++, sampleR, delta & 0xf);
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}
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}
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# pragma mark -
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template<bool STEREO, bool S16BIT, bool OLDDPCM8>
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SOLStream<STEREO, S16BIT, OLDDPCM8>::SOLStream(Common::SeekableReadStream *stream, const DisposeAfterUse::Flag disposeAfterUse, const uint16 sampleRate, const int32 rawDataSize) :
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_stream(stream, disposeAfterUse),
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_sampleRate(sampleRate),
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// SSCI aligns the size of SOL data to 32 bits
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_rawDataSize(rawDataSize & ~3) {
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if (S16BIT) {
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_dpcmCarry16.l = _dpcmCarry16.r = 0;
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} else {
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_dpcmCarry8.l = _dpcmCarry8.r = 0x80;
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}
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const uint8 compressionRatio = 2;
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const uint8 numChannels = STEREO ? 2 : 1;
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const uint8 bytesPerSample = S16BIT ? 2 : 1;
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_length = ((uint64)_rawDataSize * compressionRatio * 1000) / (_sampleRate * numChannels * bytesPerSample);
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}
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template <bool STEREO, bool S16BIT, bool OLDDPCM8>
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bool SOLStream<STEREO, S16BIT, OLDDPCM8>::seek(const Audio::Timestamp &where) {
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if (where != 0) {
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// In order to seek in compressed SOL files, all previous bytes must be
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// known since it uses differential compression. Therefore, only seeking
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// to the beginning is supported now (SSCI does not offer seeking
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// anyway)
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return false;
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}
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if (S16BIT) {
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_dpcmCarry16.l = _dpcmCarry16.r = 0;
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} else {
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_dpcmCarry8.l = _dpcmCarry8.r = 0x80;
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}
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return _stream->seek(0, SEEK_SET);
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}
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template <bool STEREO, bool S16BIT, bool OLDDPCM8>
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Audio::Timestamp SOLStream<STEREO, S16BIT, OLDDPCM8>::getLength() const {
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return _length;
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}
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template <bool STEREO, bool S16BIT, bool OLDDPCM8>
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int SOLStream<STEREO, S16BIT, OLDDPCM8>::readBuffer(int16 *buffer, const int numSamples) {
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// Reading an odd number of 8-bit samples will result in a loss of samples
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// since one byte represents two samples and we do not store the second
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// nibble in this case; it should never happen in reality
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assert(S16BIT || (numSamples % 2) == 0);
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const int samplesPerByte = S16BIT ? 1 : 2;
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int32 bytesToRead = numSamples / samplesPerByte;
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if (_stream->pos() + bytesToRead > _rawDataSize) {
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bytesToRead = _rawDataSize - _stream->pos();
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}
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if (S16BIT) {
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if (STEREO) {
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deDPCM16Stereo(buffer, *_stream, bytesToRead, _dpcmCarry16.l, _dpcmCarry16.r);
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} else {
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deDPCM16Mono(buffer, *_stream, bytesToRead, _dpcmCarry16.l);
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}
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} else {
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if (STEREO) {
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deDPCM8Stereo(buffer, *_stream, bytesToRead, _dpcmCarry8.l, _dpcmCarry8.r);
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} else {
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deDPCM8Mono<OLDDPCM8>(buffer, *_stream, bytesToRead, _dpcmCarry8.l);
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}
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}
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const int samplesRead = bytesToRead * samplesPerByte;
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return samplesRead;
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}
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template <bool STEREO, bool S16BIT, bool OLDDPCM8>
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bool SOLStream<STEREO, S16BIT, OLDDPCM8>::isStereo() const {
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return STEREO;
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}
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template <bool STEREO, bool S16BIT, bool OLDDPCM8>
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int SOLStream<STEREO, S16BIT, OLDDPCM8>::getRate() const {
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return _sampleRate;
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}
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template <bool STEREO, bool S16BIT, bool OLDDPCM8>
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bool SOLStream<STEREO, S16BIT, OLDDPCM8>::endOfData() const {
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return _stream->eos() || _stream->pos() >= _rawDataSize;
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}
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template <bool STEREO, bool S16BIT, bool OLDDPCM8>
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bool SOLStream<STEREO, S16BIT, OLDDPCM8>::rewind() {
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return seek(0);
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}
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Audio::SeekableAudioStream *makeSOLStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse) {
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int32 initialPosition = stream->pos();
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byte header[6];
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if (stream->read(header, sizeof(header)) != sizeof(header)) {
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stream->seek(initialPosition, SEEK_SET);
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return nullptr;
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}
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if ((header[0] & 0x7f) != kResourceTypeAudio || READ_BE_UINT32(header + 2) != MKTAG('S', 'O', 'L', 0)) {
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stream->seek(initialPosition, SEEK_SET);
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return nullptr;
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}
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const uint8 headerSize = header[1] + kResourceHeaderSize;
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const uint16 sampleRate = stream->readUint16LE();
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const byte flags = stream->readByte();
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const uint32 dataSize = stream->readUint32LE();
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initialPosition += headerSize;
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if (flags & kCompressed) {
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if (flags & kStereo && flags & k16Bit) {
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return new SOLStream<true, true, false>(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), DisposeAfterUse::YES, sampleRate, dataSize);
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} else if (flags & kStereo) {
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if (getSciVersion() < SCI_VERSION_2_1_EARLY) {
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error("SCI2 and earlier did not support stereo SOL audio");
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}
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return new SOLStream<true, false, false>(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), DisposeAfterUse::YES, sampleRate, dataSize);
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} else if (flags & k16Bit) {
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return new SOLStream<false, true, false>(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), DisposeAfterUse::YES, sampleRate, dataSize);
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} else {
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if (getSciVersion() < SCI_VERSION_2_1_EARLY) {
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return new SOLStream<false, false, true>(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), DisposeAfterUse::YES, sampleRate, dataSize);
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} else {
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return new SOLStream<false, false, false>(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), DisposeAfterUse::YES, sampleRate, dataSize);
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}
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}
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}
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byte rawFlags = Audio::FLAG_LITTLE_ENDIAN;
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if (flags & k16Bit) {
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rawFlags |= Audio::FLAG_16BITS;
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} else {
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rawFlags |= Audio::FLAG_UNSIGNED;
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}
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if (flags & kStereo) {
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rawFlags |= Audio::FLAG_STEREO;
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}
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return Audio::makeRawStream(new Common::SeekableSubReadStream(stream, initialPosition, initialPosition + dataSize, disposeAfterUse), sampleRate, rawFlags, disposeAfterUse);
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}
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}
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