mirror of
https://github.com/vgmstream/vgmstream.git
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cabea09cca
git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@844 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
215 lines
6.6 KiB
C
215 lines
6.6 KiB
C
#include <math.h>
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#include "coding.h"
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#include "../util.h"
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double VAG_f[5][2] = { { 0.0 , 0.0 },
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{ 60.0 / 64.0 , 0.0 },
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{ 115.0 / 64.0 , -52.0 / 64.0 },
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{ 98.0 / 64.0 , -55.0 / 64.0 } ,
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{ 122.0 / 64.0 , -60.0 / 64.0 } } ;
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long VAG_coefs[5][2] = { { 0 , 0 },
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{ 60 , 0 },
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{ 115 , -52 },
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{ 98 , -55 } ,
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{ 122 , -60 } } ;
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void decode_psx(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
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int predict_nr, shift_factor, sample;
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int32_t hist1=stream->adpcm_history1_32;
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int32_t hist2=stream->adpcm_history2_32;
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short scale;
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int i;
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int32_t sample_count;
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uint8_t flag;
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int framesin = first_sample/28;
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predict_nr = read_8bit(stream->offset+framesin*16,stream->streamfile) >> 4;
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shift_factor = read_8bit(stream->offset+framesin*16,stream->streamfile) & 0xf;
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flag = read_8bit(stream->offset+framesin*16+1,stream->streamfile);
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first_sample = first_sample % 28;
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for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
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sample=0;
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if(flag<0x07) {
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short sample_byte = (short)read_8bit(stream->offset+(framesin*16)+2+i/2,stream->streamfile);
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scale = ((i&1 ?
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sample_byte >> 4 :
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sample_byte & 0x0f)<<12);
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sample=(int)((scale >> shift_factor)+hist1*VAG_f[predict_nr][0]+hist2*VAG_f[predict_nr][1]);
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}
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outbuf[sample_count] = clamp16(sample);
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hist2=hist1;
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hist1=sample;
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}
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stream->adpcm_history1_32=hist1;
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stream->adpcm_history2_32=hist2;
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}
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void decode_invert_psx(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
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int predict_nr, shift_factor, sample;
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int32_t hist1=stream->adpcm_history1_32;
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int32_t hist2=stream->adpcm_history2_32;
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short scale;
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int i;
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int32_t sample_count;
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uint8_t flag;
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int framesin = first_sample/28;
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int head = read_8bit(stream->offset+framesin*16,stream->streamfile) ^ stream->bmdx_xor;
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predict_nr = ((head >> 4) & 0xf);
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shift_factor = (head & 0xf);
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flag = read_8bit(stream->offset+framesin*16+1,stream->streamfile);
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first_sample = first_sample % 28;
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for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
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sample=0;
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if(flag<0x07) {
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short sample_byte = (short)read_8bit(stream->offset+(framesin*16)+2+i/2,stream->streamfile);
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if (i/2 == 0)
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sample_byte = (short)(int8_t)(sample_byte+stream->bmdx_add);
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scale = ((i&1 ?
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sample_byte >> 4 :
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sample_byte & 0x0f)<<12);
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sample=(int)((scale >> shift_factor)+hist1*VAG_f[predict_nr][0]+hist2*VAG_f[predict_nr][1]);
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}
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outbuf[sample_count] = clamp16(sample);
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hist2=hist1;
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hist1=sample;
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}
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stream->adpcm_history1_32=hist1;
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stream->adpcm_history2_32=hist2;
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}
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/* some TAITO games have garbage (?) in their flags, this decoder
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* just ignores that byte */
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void decode_psx_badflags(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
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int predict_nr, shift_factor, sample;
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int32_t hist1=stream->adpcm_history1_32;
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int32_t hist2=stream->adpcm_history2_32;
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short scale;
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int i;
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int32_t sample_count;
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int framesin = first_sample/28;
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predict_nr = read_8bit(stream->offset+framesin*16,stream->streamfile) >> 4;
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shift_factor = read_8bit(stream->offset+framesin*16,stream->streamfile) & 0xf;
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first_sample = first_sample % 28;
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for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
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short sample_byte = (short)read_8bit(stream->offset+(framesin*16)+2+i/2,stream->streamfile);
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scale = ((i&1 ?
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sample_byte >> 4 :
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sample_byte & 0x0f)<<12);
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sample=(int)((scale >> shift_factor)+hist1*VAG_f[predict_nr][0]+hist2*VAG_f[predict_nr][1]);
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outbuf[sample_count] = clamp16(sample);
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hist2=hist1;
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hist1=sample;
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}
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stream->adpcm_history1_32=hist1;
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stream->adpcm_history2_32=hist2;
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}
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/* FF XI's Vag-ish format */
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void decode_ffxi_adpcm(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
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int predict_nr, shift_factor, sample;
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int32_t hist1=stream->adpcm_history1_32;
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int32_t hist2=stream->adpcm_history2_32;
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short scale;
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int i;
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int32_t sample_count;
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long predictor;
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int framesin = first_sample/16;
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predict_nr = read_8bit(stream->offset+framesin*9,stream->streamfile) >> 4;
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shift_factor = read_8bit(stream->offset+framesin*9,stream->streamfile) & 0xf;
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first_sample = first_sample % 16;
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for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
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short sample_byte = (short)read_8bit(stream->offset+(framesin*9)+1+i/2,stream->streamfile);
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sample=0;
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scale = ((i&1 ?
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sample_byte >> 4 :
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sample_byte & 0x0f)<<12);
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#if 1
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predictor =
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(int)((hist1*VAG_f[predict_nr][0]+hist2*VAG_f[predict_nr][1]));
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#else
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predictor =
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(hist1*VAG_coefs[predict_nr][0]+hist2*VAG_coefs[predict_nr][1])/64;
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#endif
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sample=(scale >> shift_factor) + predictor;
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outbuf[sample_count] = clamp16(sample);
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hist2=hist1;
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hist1=sample;
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}
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stream->adpcm_history1_32=hist1;
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stream->adpcm_history2_32=hist2;
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}
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void decode_blur_adpcm(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
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int predict_nr, shift_factor, sample;
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int32_t hist1=stream->adpcm_history1_32;
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int32_t hist2=stream->adpcm_history2_32;
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short scale;
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int i;
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int32_t sample_count;
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int framesin = first_sample/64;
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predict_nr = read_8bit(stream->offset+framesin*33,stream->streamfile) >> 4;
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shift_factor = read_8bit(stream->offset+framesin*33,stream->streamfile) & 0xf;
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first_sample = first_sample % 64;
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for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
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short sample_byte = (short)read_8bit(stream->offset+(framesin*33)+1+i/2,stream->streamfile);
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scale = ((i&1 ?
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sample_byte >> 4 :
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sample_byte & 0x0f)<<12);
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sample=(int)((scale >> shift_factor)+hist1*VAG_f[predict_nr][0]+hist2*VAG_f[predict_nr][1]);
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outbuf[sample_count] = clamp16(sample);
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hist2=hist1;
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hist1=sample;
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}
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stream->adpcm_history1_32=hist1;
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stream->adpcm_history2_32=hist2;
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}
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