mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-11-17 20:07:08 +01:00
2a686eeea2
git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@89 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
#include "coding.h"
|
|
#include "../util.h"
|
|
|
|
void decode_adx(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
|
|
int i;
|
|
int32_t sample_count;
|
|
|
|
int framesin = first_sample/32;
|
|
|
|
int32_t scale = read_16bitBE(stream->offset+framesin*18,stream->streamfile) + 1;
|
|
int32_t hist1 = stream->adpcm_history1_32;
|
|
int32_t hist2 = stream->adpcm_history2_32;
|
|
int coef1 = stream->adpcm_coef[0];
|
|
int coef2 = stream->adpcm_coef[1];
|
|
|
|
first_sample = first_sample%32;
|
|
|
|
for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
|
|
int sample_byte = read_8bit(stream->offset+framesin*18+2+i/2,stream->streamfile);
|
|
|
|
outbuf[sample_count] = clamp16(
|
|
(i&1?
|
|
get_low_nibble_signed(sample_byte):
|
|
get_high_nibble_signed(sample_byte)
|
|
) * scale +
|
|
((coef1 * hist1 + coef2 * hist2) >> 12)
|
|
);
|
|
|
|
hist2 = hist1;
|
|
hist1 = outbuf[sample_count];
|
|
}
|
|
|
|
stream->adpcm_history1_32 = hist1;
|
|
stream->adpcm_history2_32 = hist2;
|
|
}
|