mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-21 02:45:52 +01:00
30 lines
969 B
C
30 lines
969 B
C
#include "coding.h"
|
|
|
|
|
|
/* Circus XPCM mode 2 decoding, verified vs EF.exe (info from foo_adpcm/libpcm and https://github.com/lioncash/ExtractData) */
|
|
void decode_circus_adpcm(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
|
|
int i, sample_pos = 0;
|
|
int32_t hist = stream->adpcm_history1_32;
|
|
int scale = stream->adpcm_scale;
|
|
off_t frame_offset = stream->offset; /* frame size is 1 */
|
|
|
|
|
|
for (i = first_sample; i < first_sample + samples_to_do; i++) {
|
|
int8_t code = read_8bit(frame_offset+i,stream->streamfile);
|
|
|
|
hist += code << scale;
|
|
if (code == 0) {
|
|
if (scale > 0)
|
|
scale--;
|
|
}
|
|
else if (code == 127 || code == -128) {
|
|
if (scale < 8)
|
|
scale++;
|
|
}
|
|
outbuf[sample_pos] = hist;
|
|
}
|
|
|
|
stream->adpcm_history1_32 = hist;
|
|
stream->adpcm_scale = scale;
|
|
}
|