mirror of https://github.com/sm64pc/sm64pc.git
74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
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#include <stdio.h>
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#include "vadpcm.h"
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void vdecodeframe(FILE *ifile, s32 *outp, s32 order, s32 ***coefTable)
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{
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s32 optimalp;
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s32 scale;
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s32 maxlevel;
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s32 i;
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s32 j;
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s32 in_vec[16];
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s32 ix[16];
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u8 header;
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u8 c;
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maxlevel = 7;
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fread(&header, 1, 1, ifile);
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scale = 1 << (header >> 4);
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optimalp = header & 0xf;
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for (i = 0; i < 16; i += 2)
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{
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fread(&c, 1, 1, ifile);
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ix[i] = c >> 4;
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ix[i + 1] = c & 0xf;
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if (ix[i] <= maxlevel)
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{
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ix[i] *= scale;
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}
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else
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{
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ix[i] = (-0x10 - -ix[i]) * scale;
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}
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if (ix[i + 1] <= maxlevel)
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{
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ix[i + 1] *= scale;
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}
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else
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{
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ix[i + 1] = (-0x10 - -ix[i + 1]) * scale;
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}
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}
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for (j = 0; j < 2; j++)
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{
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for (i = 0; i < 8; i++)
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{
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in_vec[i + order] = ix[j * 8 + i];
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}
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if (j == 0)
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{
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for (i = 0; i < order; i++)
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{
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in_vec[i] = outp[16 - order + i];
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}
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}
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else
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{
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for (i = 0; i < order; i++)
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{
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in_vec[i] = outp[j * 8 - order + i];
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}
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}
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for (i = 0; i < 8; i++)
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{
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outp[i + j * 8] = inner_product(order + 8, coefTable[optimalp][i], in_vec);
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}
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}
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}
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