mirror of
https://github.com/libretro/scummvm.git
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636a28c0dd
(static array were not reset to NULL after being freed and therefore didn't get reallocated on restart)
657 lines
16 KiB
C++
657 lines
16 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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#include "common/scummsys.h"
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#include "common/endian.h"
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#include "common/util.h"
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#include "scumm/imuse_digi/dimuse_codecs.h"
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#include "audio/decoders/adpcm_intern.h"
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namespace Scumm {
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namespace BundleCodecs {
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uint32 decode12BitsSample(const byte *src, byte **dst, uint32 size) {
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uint32 loop_size = size / 3;
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uint32 s_size = loop_size * 4;
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byte *ptr = *dst = (byte *)malloc(s_size);
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assert(ptr);
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uint32 tmp;
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while (loop_size--) {
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byte v1 = *src++;
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byte v2 = *src++;
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byte v3 = *src++;
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tmp = ((((v2 & 0x0f) << 8) | v1) << 4) - 0x8000;
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WRITE_BE_UINT16(ptr, tmp); ptr += 2;
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tmp = ((((v2 & 0xf0) << 4) | v3) << 4) - 0x8000;
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WRITE_BE_UINT16(ptr, tmp); ptr += 2;
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}
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return s_size;
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}
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/*
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* The "IMC" codec below (see cases 13 & 15 in decompressCodec) is actually a
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* variant of the IMA codec, see also
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* <http://www.multimedia.cx/simpleaudio.html>
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*
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* It is somewhat different, though: the standard ADPCM codecs use a fixed
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* size for their data packets (4 bits), while the codec implemented here
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* varies the size of each "packet" between 2 and 7 bits.
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*/
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static byte *_destImcTable = NULL;
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static uint32 *_destImcTable2 = NULL;
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// This table is the "big brother" of Audio::ADPCMStream::_stepAdjustTable.
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static const byte imxOtherTable[6][64] = {
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{
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0xFF,
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4
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},
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{
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0xFF, 0xFF,
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2, 8
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},
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{
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0xFF, 0xFF, 0xFF, 0xFF,
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1, 2, 4, 6
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},
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{
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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1, 2, 4, 6, 8, 12, 16, 32
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},
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{
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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1, 2, 4, 6, 8, 10, 12, 14,
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16, 18, 20, 22, 24, 26, 28, 32
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},
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{
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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1, 2, 3, 4, 5, 6, 7, 8,
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9, 10, 11, 12, 13, 14, 15, 16,
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17, 18, 19, 20, 21, 22, 23, 24,
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25, 26, 27, 28, 29, 30, 31, 32
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}
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};
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void releaseImcTables() {
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free(_destImcTable);
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_destImcTable = NULL;
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free(_destImcTable2);
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_destImcTable2 = NULL;
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}
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void initializeImcTables() {
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int pos;
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if (!_destImcTable) _destImcTable = (byte *)calloc(89, sizeof(byte));
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if (!_destImcTable2) _destImcTable2 = (uint32 *)calloc(89 * 64, sizeof(uint32));
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for (pos = 0; pos <= 88; ++pos) {
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byte put = 1;
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int32 tableValue = ((Audio::Ima_ADPCMStream::_imaTable[pos] * 4) / 7) / 2;
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while (tableValue != 0) {
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tableValue /= 2;
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put++;
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}
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if (put < 3) {
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put = 3;
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}
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if (put > 8) {
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put = 8;
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}
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_destImcTable[pos] = put - 1;
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}
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for (int n = 0; n < 64; n++) {
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for (pos = 0; pos <= 88; ++pos) {
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int32 count = 32;
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int32 put = 0;
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int32 tableValue = Audio::Ima_ADPCMStream::_imaTable[pos];
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do {
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if ((count & n) != 0) {
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put += tableValue;
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}
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count /= 2;
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tableValue /= 2;
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} while (count != 0);
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_destImcTable2[n + pos * 64] = put;
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}
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}
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}
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#define NextBit \
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do { \
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bit = mask & 1; \
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mask >>= 1; \
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if (!--bitsleft) { \
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mask = READ_LE_UINT16(srcptr); \
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srcptr += 2; \
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bitsleft = 16; \
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} \
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} while (0)
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static int32 compDecode(byte *src, byte *dst) {
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byte *result, *srcptr = src, *dstptr = dst;
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int data, size, bit, bitsleft = 16, mask = READ_LE_UINT16(srcptr);
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srcptr += 2;
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for (;;) {
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NextBit;
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if (bit) {
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*dstptr++ = *srcptr++;
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} else {
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NextBit;
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if (!bit) {
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NextBit;
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size = bit << 1;
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NextBit;
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size = (size | bit) + 3;
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data = *srcptr++ | 0xffffff00;
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} else {
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data = *srcptr++;
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size = *srcptr++;
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data |= 0xfffff000 + ((size & 0xf0) << 4);
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size = (size & 0x0f) + 3;
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if (size == 3)
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if (((*srcptr++) + 1) == 1)
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return dstptr - dst;
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}
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result = dstptr + data;
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while (size--)
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*dstptr++ = *result++;
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}
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}
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}
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#undef NextBit
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int32 decompressADPCM(byte *compInput, byte *compOutput, int channels) {
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byte *src;
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// Decoder for the the IMA ADPCM variants used in COMI.
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// Contrary to regular IMA ADPCM, this codec uses a variable
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// bitsize for the encoded data.
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const int MAX_CHANNELS = 2;
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int32 outputSamplesLeft;
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int32 destPos;
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int16 firstWord;
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byte initialTablePos[MAX_CHANNELS] = {0, 0};
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//int32 initialimcTableEntry[MAX_CHANNELS] = {7, 7};
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int32 initialOutputWord[MAX_CHANNELS] = {0, 0};
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int32 totalBitOffset, curTablePos, outputWord;
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byte *dst;
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int i;
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// We only support mono and stereo
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assert(channels == 1 || channels == 2);
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src = compInput;
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dst = compOutput;
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outputSamplesLeft = 0x1000;
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// Every data packet contains 0x2000 bytes of audio data
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// when extracted. In order to encode bigger data sets,
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// one has to split the data into multiple blocks.
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//
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// Every block starts with a 2 byte word. If that word is
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// non-zero, it indicates the size of a block of raw audio
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// data (not encoded) following it. That data we simply copy
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// to the output buffer and then proceed by decoding the
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// remaining data.
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//
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// If on the other hand the word is zero, then what follows
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// are 7*channels bytes containing seed data for the decoder.
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firstWord = READ_BE_UINT16(src);
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src += 2;
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if (firstWord != 0) {
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// Copy raw data
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memcpy(dst, src, firstWord);
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dst += firstWord;
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src += firstWord;
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assert((firstWord & 1) == 0);
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outputSamplesLeft -= firstWord / 2;
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} else {
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// Read the seed values for the decoder.
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for (i = 0; i < channels; i++) {
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initialTablePos[i] = *src;
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src += 1;
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//initialimcTableEntry[i] = READ_BE_UINT32(src);
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src += 4;
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initialOutputWord[i] = READ_BE_UINT32(src);
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src += 4;
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}
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}
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totalBitOffset = 0;
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// The channels are encoded separately.
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for (int chan = 0; chan < channels; chan++) {
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// Read initial state (this makes it possible for the data stream
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// to be split & spread across multiple data chunks.
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curTablePos = initialTablePos[chan];
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//imcTableEntry = initialimcTableEntry[chan];
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outputWord = initialOutputWord[chan];
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// We need to interleave the channels in the output; we achieve
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// that by using a variables dest offset:
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destPos = chan * 2;
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const int bound = (channels == 1)
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? outputSamplesLeft
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: ((chan == 0)
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? (outputSamplesLeft+1) / 2
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: outputSamplesLeft / 2);
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for (i = 0; i < bound; ++i) {
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// Determine the size (in bits) of the next data packet
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const int32 curTableEntryBitCount = _destImcTable[curTablePos];
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assert(2 <= curTableEntryBitCount && curTableEntryBitCount <= 7);
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// Read the next data packet
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const byte *readPos = src + (totalBitOffset >> 3);
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const uint16 readWord = (uint16)(READ_BE_UINT16(readPos) << (totalBitOffset & 7));
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const byte packet = (byte)(readWord >> (16 - curTableEntryBitCount));
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// Advance read position to the next data packet
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totalBitOffset += curTableEntryBitCount;
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// Decode the data packet into a delta value for the output signal.
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const byte signBitMask = (1 << (curTableEntryBitCount - 1));
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const byte dataBitMask = (signBitMask - 1);
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const byte data = (packet & dataBitMask);
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const int32 tmpA = (data << (7 - curTableEntryBitCount));
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const int32 imcTableEntry = Audio::Ima_ADPCMStream::_imaTable[curTablePos] >> (curTableEntryBitCount - 1);
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int32 delta = imcTableEntry + _destImcTable2[tmpA + (curTablePos * 64)];
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// The topmost bit in the data packet tells is a sign bit
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if ((packet & signBitMask) != 0) {
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delta = -delta;
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}
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// Accumulate the delta onto the output data
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outputWord += delta;
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// Clip outputWord to 16 bit signed, and write it into the destination stream
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outputWord = CLIP<int32>(outputWord, -0x8000, 0x7fff);
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WRITE_BE_UINT16(dst + destPos, outputWord);
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destPos += channels << 1;
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// Adjust the curTablePos
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curTablePos += (int8)imxOtherTable[curTableEntryBitCount - 2][data];
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curTablePos = CLIP<int32>(curTablePos, 0, ARRAYSIZE(Audio::Ima_ADPCMStream::_imaTable) - 1);
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}
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}
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return 0x2000;
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}
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int32 decompressCodec(int32 codec, byte *compInput, byte *compOutput, int32 inputSize) {
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int32 outputSize;
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int32 offset1, offset2, offset3, length, k, c, s, j, r, t, z;
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byte *src, *t_table, *p, *ptr;
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byte t_tmp1, t_tmp2;
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switch (codec) {
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case 0:
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memcpy(compOutput, compInput, inputSize);
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outputSize = inputSize;
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break;
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case 1:
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outputSize = compDecode(compInput, compOutput);
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break;
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case 2:
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outputSize = compDecode(compInput, compOutput);
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p = compOutput;
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for (z = 1; z < outputSize; z++)
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p[z] += p[z - 1];
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break;
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case 3:
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outputSize = compDecode(compInput, compOutput);
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p = compOutput;
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for (z = 2; z < outputSize; z++)
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p[z] += p[z - 1];
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for (z = 1; z < outputSize; z++)
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p[z] += p[z - 1];
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break;
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case 4:
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outputSize = compDecode(compInput, compOutput);
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p = compOutput;
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for (z = 2; z < outputSize; z++)
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p[z] += p[z - 1];
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for (z = 1; z < outputSize; z++)
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p[z] += p[z - 1];
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t_table = (byte *)malloc(outputSize);
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assert(t_table);
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src = compOutput;
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length = (outputSize << 3) / 12;
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k = 0;
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if (length > 0) {
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c = -12;
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s = 0;
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j = 0;
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do {
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ptr = src + length + (k >> 1);
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t_tmp2 = src[j];
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if (k & 1) {
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r = c >> 3;
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t_table[r + 2] = ((t_tmp2 & 0x0f) << 4) | (ptr[1] >> 4);
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t_table[r + 1] = (t_tmp2 & 0xf0) | (t_table[r + 1]);
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} else {
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r = s >> 3;
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t_table[r + 0] = ((t_tmp2 & 0x0f) << 4) | (ptr[0] & 0x0f);
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t_table[r + 1] = t_tmp2 >> 4;
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}
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s += 12;
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c += 12;
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k++;
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j++;
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} while (k < length);
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}
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offset1 = ((length - 1) * 3) >> 1;
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t_table[offset1 + 1] = (t_table[offset1 + 1]) | (src[length - 1] & 0xf0);
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memcpy(src, t_table, outputSize);
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free(t_table);
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break;
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case 5:
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outputSize = compDecode(compInput, compOutput);
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p = compOutput;
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for (z = 2; z < outputSize; z++)
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p[z] += p[z - 1];
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for (z = 1; z < outputSize; z++)
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p[z] += p[z - 1];
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t_table = (byte *)malloc(outputSize);
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assert(t_table);
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src = compOutput;
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length = (outputSize << 3) / 12;
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k = 1;
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c = 0;
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s = 12;
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t_table[0] = src[length] >> 4;
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t = length + k;
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j = 1;
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if (t > k) {
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do {
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t_tmp1 = *(src + length + (k >> 1));
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t_tmp2 = src[j - 1];
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if (k & 1) {
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r = c >> 3;
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t_table[r + 0] = (t_tmp2 & 0xf0) | t_table[r];
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t_table[r + 1] = ((t_tmp2 & 0x0f) << 4) | (t_tmp1 & 0x0f);
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} else {
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r = s >> 3;
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t_table[r + 0] = t_tmp2 >> 4;
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t_table[r - 1] = ((t_tmp2 & 0x0f) << 4) | (t_tmp1 >> 4);
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}
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s += 12;
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c += 12;
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k++;
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j++;
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} while (k < t);
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}
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memcpy(src, t_table, outputSize);
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free(t_table);
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break;
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case 6:
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outputSize = compDecode(compInput, compOutput);
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p = compOutput;
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for (z = 2; z < outputSize; z++)
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p[z] += p[z - 1];
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for (z = 1; z < outputSize; z++)
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p[z] += p[z - 1];
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t_table = (byte *)malloc(outputSize);
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assert(t_table);
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src = compOutput;
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length = (outputSize << 3) / 12;
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k = 0;
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c = 0;
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j = 0;
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s = -12;
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t_table[0] = src[outputSize - 1];
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t_table[outputSize - 1] = src[length - 1];
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t = length - 1;
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if (t > 0) {
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do {
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t_tmp1 = *(src + length + (k >> 1));
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t_tmp2 = src[j];
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if (k & 1) {
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r = s >> 3;
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t_table[r + 2] = (t_tmp2 & 0xf0) | t_table[r + 2];
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t_table[r + 3] = ((t_tmp2 & 0x0f) << 4) | (t_tmp1 >> 4);
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} else {
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r = c >> 3;
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t_table[r + 2] = t_tmp2 >> 4;
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t_table[r + 1] = ((t_tmp2 & 0x0f) << 4) | (t_tmp1 & 0x0f);
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}
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s += 12;
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c += 12;
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k++;
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j++;
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} while (k < t);
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}
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memcpy(src, t_table, outputSize);
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free(t_table);
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break;
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case 10:
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outputSize = compDecode(compInput, compOutput);
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p = compOutput;
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for (z = 2; z < outputSize; z++)
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p[z] += p[z - 1];
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for (z = 1; z < outputSize; z++)
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p[z] += p[z - 1];
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t_table = (byte *)malloc(outputSize);
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assert(t_table);
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memcpy(t_table, p, outputSize);
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offset1 = outputSize / 3;
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offset2 = offset1 << 1;
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offset3 = offset2;
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src = compOutput;
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while (offset1--) {
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offset2 -= 2;
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offset3--;
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t_table[offset2 + 0] = src[offset1];
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t_table[offset2 + 1] = src[offset3];
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}
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src = compOutput;
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length = (outputSize << 3) / 12;
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k = 0;
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if (length > 0) {
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c = -12;
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s = 0;
|
|
do {
|
|
j = length + (k >> 1);
|
|
t_tmp1 = t_table[k];
|
|
if (k & 1) {
|
|
r = c >> 3;
|
|
t_tmp2 = t_table[j + 1];
|
|
src[r + 2] = ((t_tmp1 & 0x0f) << 4) | (t_tmp2 >> 4);
|
|
src[r + 1] = (src[r + 1]) | (t_tmp1 & 0xf0);
|
|
} else {
|
|
r = s >> 3;
|
|
t_tmp2 = t_table[j];
|
|
src[r + 0] = ((t_tmp1 & 0x0f) << 4) | (t_tmp2 & 0x0f);
|
|
src[r + 1] = t_tmp1 >> 4;
|
|
}
|
|
s += 12;
|
|
c += 12;
|
|
k++;
|
|
} while (k < length);
|
|
}
|
|
offset1 = ((length - 1) * 3) >> 1;
|
|
src[offset1 + 1] = (t_table[length] & 0xf0) | src[offset1 + 1];
|
|
free(t_table);
|
|
break;
|
|
|
|
case 11:
|
|
outputSize = compDecode(compInput, compOutput);
|
|
p = compOutput;
|
|
for (z = 2; z < outputSize; z++)
|
|
p[z] += p[z - 1];
|
|
for (z = 1; z < outputSize; z++)
|
|
p[z] += p[z - 1];
|
|
|
|
t_table = (byte *)malloc(outputSize);
|
|
assert(t_table);
|
|
memcpy(t_table, p, outputSize);
|
|
|
|
offset1 = outputSize / 3;
|
|
offset2 = offset1 << 1;
|
|
offset3 = offset2;
|
|
src = compOutput;
|
|
|
|
while (offset1--) {
|
|
offset2 -= 2;
|
|
offset3--;
|
|
t_table[offset2 + 0] = src[offset1];
|
|
t_table[offset2 + 1] = src[offset3];
|
|
}
|
|
|
|
src = compOutput;
|
|
length = (outputSize << 3) / 12;
|
|
k = 1;
|
|
c = 0;
|
|
s = 12;
|
|
t_tmp1 = t_table[length] >> 4;
|
|
src[0] = t_tmp1;
|
|
t = length + k;
|
|
if (t > k) {
|
|
do {
|
|
j = length + (k >> 1);
|
|
t_tmp1 = t_table[k - 1];
|
|
t_tmp2 = t_table[j];
|
|
if (k & 1) {
|
|
r = c >> 3;
|
|
src[r + 0] = (src[r]) | (t_tmp1 & 0xf0);
|
|
src[r + 1] = ((t_tmp1 & 0x0f) << 4) | (t_tmp2 & 0x0f);
|
|
} else {
|
|
r = s >> 3;
|
|
src[r + 0] = t_tmp1 >> 4;
|
|
src[r - 1] = ((t_tmp1 & 0x0f) << 4) | (t_tmp2 >> 4);
|
|
}
|
|
s += 12;
|
|
c += 12;
|
|
k++;
|
|
} while (k < t);
|
|
}
|
|
free(t_table);
|
|
break;
|
|
|
|
case 12:
|
|
outputSize = compDecode(compInput, compOutput);
|
|
p = compOutput;
|
|
for (z = 2; z < outputSize; z++)
|
|
p[z] += p[z - 1];
|
|
for (z = 1; z < outputSize; z++)
|
|
p[z] += p[z - 1];
|
|
|
|
t_table = (byte *)malloc(outputSize);
|
|
assert(t_table);
|
|
memcpy(t_table, p, outputSize);
|
|
|
|
offset1 = outputSize / 3;
|
|
offset2 = offset1 << 1;
|
|
offset3 = offset2;
|
|
src = compOutput;
|
|
|
|
while (offset1--) {
|
|
offset2 -= 2;
|
|
offset3--;
|
|
t_table[offset2 + 0] = src[offset1];
|
|
t_table[offset2 + 1] = src[offset3];
|
|
}
|
|
|
|
src = compOutput;
|
|
length = (outputSize << 3) / 12;
|
|
k = 0;
|
|
c = 0;
|
|
s = -12;
|
|
src[0] = t_table[outputSize - 1];
|
|
src[outputSize - 1] = t_table[length - 1];
|
|
t = length - 1;
|
|
if (t > 0) {
|
|
do {
|
|
j = length + (k >> 1);
|
|
t_tmp1 = t_table[k];
|
|
t_tmp2 = t_table[j];
|
|
if (k & 1) {
|
|
r = s >> 3;
|
|
src[r + 2] = (src[r + 2]) | (t_tmp1 & 0xf0);
|
|
src[r + 3] = ((t_tmp1 & 0x0f) << 4) | (t_tmp2 >> 4);
|
|
} else {
|
|
r = c >> 3;
|
|
src[r + 2] = t_tmp1 >> 4;
|
|
src[r + 1] = ((t_tmp1 & 0x0f) << 4) | (t_tmp2 & 0x0f);
|
|
}
|
|
s += 12;
|
|
c += 12;
|
|
k++;
|
|
} while (k < t);
|
|
}
|
|
free(t_table);
|
|
break;
|
|
|
|
case 13:
|
|
case 15:
|
|
outputSize = decompressADPCM(compInput, compOutput, (codec == 13) ? 1 : 2);
|
|
break;
|
|
|
|
default:
|
|
error("BundleCodecs::decompressCodec() Unknown codec %d", (int)codec);
|
|
outputSize = 0;
|
|
break;
|
|
}
|
|
|
|
return outputSize;
|
|
}
|
|
|
|
} // End of namespace BundleCodecs
|
|
|
|
} // End of namespace Scumm
|