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/*
TXboxAdpcmDecoder class
(c) 2005 Benjamin Haisch
Revision 2 with stereo support
###
C conversion 0.1.3
by Luigi Auriemma
e-mail: aluigi@autistici.org
web: aluigi.org
Copyright 2005,2006 Luigi Auriemma
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
http://www.gnu.org/licenses/gpl.txt
*/
#include "uXboxAdpcmDecoder.h"
#define TXboxAdpcmDecoder_delimit(x,h,l) \
if(x > h) { \
x = h; \
} else if(x < l) { \
x = l; \
}
typedef struct {
int8_t Index;
int16_t StepSize;
int16_t Predictor;
} TAdpcmState;
const static int16_t StepTable[89] = {
7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
};
const static int8_t IndexTable[16] = {
-1, -1, -1, -1, 2, 4, 6, 8,
-1, -1, -1, -1, 2, 4, 6, 8
};
int TXboxAdpcmDecoder_DecodeSample(int Code, TAdpcmState *State) {
int Delta,
Result;
Delta = State->StepSize >> 3;
if(Code & 4) Delta += State->StepSize;
if(Code & 2) Delta += State->StepSize >> 1;
if(Code & 1) Delta += State->StepSize >> 2;
if(Code & 8) Delta = -Delta;
Result = State->Predictor + Delta;
TXboxAdpcmDecoder_delimit(Result, 32767, -32768);
State->Index += IndexTable[Code];
TXboxAdpcmDecoder_delimit(State->Index, 88, 0);
State->StepSize = StepTable[State->Index];
State->Predictor = Result;
return(Result);
}
int TXboxAdpcmDecoder_Decode_Memory(uint8_t *in, int inlen, uint8_t *out, int FChannels) {
TAdpcmState FAdpcmState[6];
int16_t Buffers[6][8];
uint32_t CodeBuf;
int i,
j,
c,
outlen;
inlen = (inlen / XBOX_ADPCM_SRCSIZE) / FChannels;
for(outlen = 0; inlen--; outlen++) {
for(c = 0; c < FChannels; c++) {
*out++ = in[0];
*out++ = in[1];
FAdpcmState[c].Predictor = in[0] | (in[1] << 8); in += 2;
FAdpcmState[c].Index = in[0] | (in[1] << 8); in += 2;
TXboxAdpcmDecoder_delimit(FAdpcmState[c].Index, 88, 0);
FAdpcmState[c].StepSize = StepTable[FAdpcmState[c].Index];
}
for(i = 0; i < 8; i++) {
for(c = 0; c < FChannels; c++) {
CodeBuf = in[0] | (in[1] << 8) | (in[2] << 16) | (in[3] << 24);
in += 4;
for(j = 0; j < 8; j++) {
Buffers[c][j] = TXboxAdpcmDecoder_DecodeSample(CodeBuf & 15, &FAdpcmState[c]);
CodeBuf >>= 4;
}
}
for(j = 0; j < 8; j++) {
for(c = 0; c < FChannels; c++) {
*out++ = (Buffers[c][j] ) & 0xff;
*out++ = (Buffers[c][j] >> 8) & 0xff;
}
}
}
}
return(outlen * XBOX_ADPCM_DSTSIZE * FChannels);
}
int TXboxAdpcmDecoder_Decode(FILE *ASource, FILE *ADest, int SourcePos, int SourceSize, int FChannels) {
int DestSize;
uint8_t in[XBOX_ADPCM_SRCSIZE * 6],
out[XBOX_ADPCM_DSTSIZE * 6];
if(FChannels <= 0) return(0);
if(SourcePos >= 0) {
if(fseek(ASource, SourcePos, SEEK_SET) < 0) return(0);
}
if(SourceSize > 0) {
SourceSize -= (SourceSize % XBOX_ADPCM_SRCSIZE);
SourceSize = (SourceSize / XBOX_ADPCM_SRCSIZE) / FChannels;
}
for(DestSize = 0; SourceSize; SourceSize--) {
if(!fread(in, sizeof(in), 1, ASource)) break;
DestSize += TXboxAdpcmDecoder_Decode_Memory(in, sizeof(in), out, FChannels);
if(!fwrite(out, sizeof(out), 1, ADest)) break;
}
return(DestSize);
}
int TXboxAdpcmDecoder_guess_output_size(int SourceSize) {
return((SourceSize / XBOX_ADPCM_SRCSIZE) * XBOX_ADPCM_DSTSIZE);
}
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