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Improve Dreamcast AICA decoding (not very noticeable)

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On decoding start step_size was 0, but Yamaha ADPCM is supposed to start
at 127 so there was some deviation, usually minor as most files start in
silence.
This commit is contained in:
bnnm 2018-03-24 12:13:04 +01:00
parent fbd8e94e41
commit d821ecb117
1 changed files with 4 additions and 0 deletions
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4
src/coding/aica_decoder.c
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@ -22,6 +22,10 @@ void decode_aica(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing,
int32_t hist1 = stream->adpcm_history1_16;
int step_size = stream->adpcm_step_index;
/* no header (external setup), pre-clamp for wrong values */
if (step_size < 0x7f) step_size = 0x7f;
if (step_size > 0x6000) step_size = 0x6000;
for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
int sample_nibble, sample_decoded, sample_delta;
off_t byte_offset = (stream->offset) + i/2;