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49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
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#include "coding.h"
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/* originally only positives are stored (pre-init by copying negatives) */
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static const int wady_table[64+64] = {
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0, 2, 4, 6, 8, 10, 12, 15,
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18, 21, 24, 28, 32, 36, 40, 44,
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49, 54, 59, 64, 70, 76, 82, 88,
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95, 102, 109, 116, 124, 132, 140, 148,
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160, 170, 180, 190, 200, 210, 220, 230,
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240, 255, 270, 285, 300, 320, 340, 360,
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380, 400, 425, 450, 475, 500, 525, 550,
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580, 610, 650, 700, 750, 800, 900, 1000,
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-0, -2, -4, -6, -8, -10, -12, -15,
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-18, -21, -24, -28, -32, -36, -40, -44,
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-49, -54, -59, -64, -70, -76, -82, -88,
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-95, -102,-109,-116,-124,-132,-140,-148,
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-160,-170,-180,-190,-200,-210,-220,-230,
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-240,-255,-270,-285,-300,-320,-340,-360,
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-380,-400,-425,-450,-475,-500,-525,-550,
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-580,-610,-650,-700,-750,-800,-900,-1000,
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};
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/* There is another decoding mode mainly for SFX. Uses headered frames/blocks (big),
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* L-frame then R-frame, DPCM uses another table plus a RLE/LZ-like mode */
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/* Marble engine WADY decoder, decompiled from the exe
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* (some info from: https://github.com/morkt/GARbro/blob/master/ArcFormats/Marble/AudioWADY.cs) */
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void decode_wady(VGMSTREAMCHANNEL* stream, sample_t* outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
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int i, sample_pos = 0;
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off_t frame_offset = stream->offset; /* frame size is 1 */
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int32_t hist = stream->adpcm_history1_32;
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int scale = stream->adpcm_scale;
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for (i = first_sample; i < first_sample + samples_to_do; i++) {
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int8_t code = read_s8(frame_offset + i, stream->streamfile);
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if (code & 0x80)
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hist = (code << 9); /* PCM */
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else
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hist += scale * wady_table[code]; /* DPCM */
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outbuf[sample_pos] = hist; /* no clamp */
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sample_pos += channelspacing;
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}
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stream->adpcm_history1_32 = hist;
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}
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