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30 lines
969 B
C
30 lines
969 B
C
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#include "coding.h"
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/* Circus XPCM mode 2 decoding, verified vs EF.exe (info from foo_adpcm/libpcm and https://github.com/lioncash/ExtractData) */
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void decode_circus_adpcm(VGMSTREAMCHANNEL * stream, sample * 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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int32_t hist = stream->adpcm_history1_32;
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int scale = stream->adpcm_scale;
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off_t frame_offset = stream->offset; /* frame size is 1 */
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for (i = first_sample; i < first_sample + samples_to_do; i++) {
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int8_t code = read_8bit(frame_offset+i,stream->streamfile);
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hist += code << scale;
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if (code == 0) {
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if (scale > 0)
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scale--;
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}
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else if (code == 127 || code == -128) {
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if (scale < 8)
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scale++;
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}
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outbuf[sample_pos] = hist;
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}
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stream->adpcm_history1_32 = hist;
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stream->adpcm_scale = scale;
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}
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