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Revert changes for extended mode in SPU-ADPCM

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korenkonder 2020-03-04 01:53:56 +03:00 committed by GitHub
parent b715cb023b
commit 281c6ca73e
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1 changed files with 22 additions and 38 deletions
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src/coding/psx_decoder.c
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@ -133,6 +133,7 @@ void decode_psx_configurable(VGMSTREAMCHANNEL* stream, sample_t* outbuf, int cha
int32_t hist1 = stream->adpcm_history1_32;
int32_t hist2 = stream->adpcm_history2_32;
int extended_mode = (config == 1);
int float_mode = (config == 1);
/* external interleave (variable size), mono */
@ -147,52 +148,35 @@ void decode_psx_configurable(VGMSTREAMCHANNEL* stream, sample_t* outbuf, int cha
coef_index = (frame[0] >> 4) & 0xf;
shift_factor = (frame[0] >> 0) & 0xf;
if (extended_mode) { /*float logic*/
shift_factor = 20 - shift_factor;
/* decode nibbles */
for (i = first_sample; i < first_sample + samples_to_do; i++) {
int32_t sample = 0;
uint8_t nibbles = frame[0x01 + i/2];
sample = (i&1 ? /* low nibble first */
get_high_nibble_signed(nibbles):
get_low_nibble_signed(nibbles)) << shift_factor; /*scale*/
sample = sample + (int32_t)((ps_adpcm_coefs_f[coef_index][0]*hist1 + ps_adpcm_coefs_f[coef_index][1]*hist2) * 256.0f);
sample >>= 8;
outbuf[sample_count] = clamp16(sample); /*clamping*/
sample_count += channelspacing;
hist2 = hist1;
hist1 = sample;
}
}
else { /*int logic*/
/* upper filters only used in few PS3 games, normally 0 */
/* upper filters only used in few PS3 games, normally 0 */
if (!extended_mode) {
VGM_ASSERT_ONCE(coef_index > 5 || shift_factor > 12, "PS-ADPCM: incorrect coefs/shift at %x\n", (uint32_t)frame_offset);
if (coef_index > 5)
coef_index = 0;
if (shift_factor > 12)
shift_factor = 9; /* supposedly, from Nocash PSX docs */
}
shift_factor = 18 - shift_factor;
/* decode nibbles */
for (i = first_sample; i < first_sample + samples_to_do; i++) {
int32_t sample = 0;
uint8_t nibbles = frame[0x01 + i/2];
sample = (i&1 ? /* low nibble first */
get_high_nibble_signed(nibbles):
get_low_nibble_signed(nibbles)) << shift_factor; /*scale*/
sample = sample + (ps_adpcm_coefs_i[coef_index][0]*hist1 + ps_adpcm_coefs_i[coef_index][1]*hist2);
sample >>= 6;
outbuf[sample_count] = clamp16(sample); /*clamping*/
sample_count += channelspacing;
/* decode nibbles */
for (i = first_sample; i < first_sample + samples_to_do; i++) {
int32_t sample = 0;
uint8_t nibbles = frame[0x01 + i/2];
hist2 = hist1;
hist1 = sample;
}
sample = i&1 ? /* low nibble first */
(nibbles >> 4) & 0x0f :
(nibbles >> 0) & 0x0f;
sample = (int16_t)((sample << 12) & 0xf000) >> shift_factor; /* 16b sign extend + scale */
sample = float_mode ?
(int32_t)(sample + ps_adpcm_coefs_f[coef_index][0]*hist1 + ps_adpcm_coefs_f[coef_index][1]*hist2) :
sample + ((ps_adpcm_coefs_i[coef_index][0]*hist1 + ps_adpcm_coefs_i[coef_index][1]*hist2) >> 6);
sample = clamp16(sample);
outbuf[sample_count] = sample;
sample_count += channelspacing;
hist2 = hist1;
hist1 = sample;
}
stream->adpcm_history1_32 = hist1;