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Update ASF decoder based on decompilation of original decoder.

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This commit is contained in:
Christopher Snowhill 2018-07-23 18:56:35 -07:00
parent 8e16eb108c
commit e799a27446
1 changed files with 5 additions and 7 deletions
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12
src/coding/asf_decoder.c
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@ -3,6 +3,7 @@
/* Decodes Argonaut's ASF ADPCM codec. Algorithm follows Croc2_asf2raw.exe, and the waveform
* looks almost correct, but should reverse engineer asfcodec.adl (DLL) for accuracy. */
#define carry(a, b) (((uint32_t)(a) > (uint32_t)((a) + (b))))
void decode_asf(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do) {
off_t frame_offset;
int i, frames_in, sample_count = 0;
@ -30,17 +31,15 @@ void decode_asf(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing,
new_sample = i&1 ? /* high nibble first */
get_low_nibble_signed(nibbles):
get_high_nibble_signed(nibbles);
new_sample = new_sample << shift;
new_sample = new_sample << (shift + 6);
switch(mode) {
case 0x00:
new_sample = new_sample + hist1;
//new_sample = (new_sample + (hist1 << 6)) >> 6; /* maybe? */
new_sample = (new_sample + (hist1 << 6)) >> 6;
break;
case 0x04:
new_sample = new_sample + hist1*2 - hist2;
//new_sample = (new_sample + (hist1 << 7) - (hist2 << 6)) >> 6; /* maybe? */
new_sample = (new_sample + (hist1 << 7) - (hist2 << 6)) >> 6;
break;
default: /* other modes (ex 0x02/09) seem only at last frame as 0 */
@ -50,9 +49,8 @@ void decode_asf(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing,
}
//new_sample = clamp16(new_sample); /* must not */
new_sample = new_sample & 0xFFFF; /* probably unnecessary and only casting is needed */
outbuf[sample_count] = new_sample;
outbuf[sample_count] = (int16_t)new_sample;
sample_count += channelspacing;
hist2 = hist1;