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Better decode for PSX & PSV ADPCM

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This commit is contained in:
korenkonder 2020-03-02 17:28:56 +03:00
parent c40d364e87
commit b715cb023b
2 changed files with 63 additions and 50 deletions
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20
src/coding/psv_decoder.c
View File

@ -173,25 +173,25 @@ void decode_hevag(VGMSTREAMCHANNEL * stream, sample_t * outbuf, int channelspaci
if (shift_factor > 12)
shift_factor = 9; /* ? */
shift_factor = 20 - shift_factor;
/* decode nibbles */
for (i = first_sample; i < first_sample + samples_to_do; i++) {
int32_t sample = 0, scale = 0;
int32_t sample = 0;
if (flag < 0x07) { /* with flag 0x07 decoded sample must be 0 */
uint8_t nibbles = frame[0x02 + i/2];
scale = i&1 ? /* low nibble first */
sample = (i&1 ? /* low nibble first */
get_high_nibble_signed(nibbles):
get_low_nibble_signed(nibbles);
sample = (hist1 * hevag_coefs[coef_index][0] +
hist2 * hevag_coefs[coef_index][1] +
hist3 * hevag_coefs[coef_index][2] +
hist4 * hevag_coefs[coef_index][3] ) / 32;
sample = (sample + (scale << (20 - shift_factor)) + 128) >> 8;
sample = clamp16(sample);
get_low_nibble_signed(nibbles)) << shift_factor; /*scale*/
sample = ((hist1 * hevag_coefs[coef_index][0] +
hist2 * hevag_coefs[coef_index][1] +
hist3 * hevag_coefs[coef_index][2] +
hist4 * hevag_coefs[coef_index][3]) >> 5) + sample;
sample >>= 8;
}
outbuf[sample_count] = sample;
outbuf[sample_count] = clamp16(sample); /*clamping*/
sample_count += channelspacing;
hist4 = hist3;

93
src/coding/psx_decoder.c
View File

@ -93,22 +93,22 @@ void decode_psx(VGMSTREAMCHANNEL* stream, sample_t* outbuf, int channelspacing,
VGM_ASSERT_ONCE(flag > 7,"PS-ADPCM: unknown flag at %x\n", (uint32_t)frame_offset); /* meta should use PSX-badflags */
shift_factor = 20 - shift_factor;
/* decode nibbles */
for (i = first_sample; i < first_sample + samples_to_do; i++) {
int32_t sample = 0;
if (flag < 0x07) { /* with flag 0x07 decoded sample must be 0 */
uint8_t nibbles = frame[0x02 + i/2];
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 = (int32_t)(sample + ps_adpcm_coefs_f[coef_index][0]*hist1 + ps_adpcm_coefs_f[coef_index][1]*hist2);
sample = clamp16(sample);
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] = sample;
outbuf[sample_count] = clamp16(sample); /*clamping*/
sample_count += channelspacing;
hist2 = hist1;
@ -133,7 +133,6 @@ 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 */
@ -148,35 +147,52 @@ void decode_psx_configurable(VGMSTREAMCHANNEL* stream, sample_t* outbuf, int cha
coef_index = (frame[0] >> 4) & 0xf;
shift_factor = (frame[0] >> 0) & 0xf;
/* upper filters only used in few PS3 games, normally 0 */
if (!extended_mode) {
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 */
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;
/* decode nibbles */
for (i = first_sample; i < first_sample + samples_to_do; i++) {
int32_t sample = 0;
uint8_t nibbles = frame[0x01 + i/2];
outbuf[sample_count] = clamp16(sample); /*clamping*/
sample_count += channelspacing;
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;
hist2 = hist1;
hist1 = sample;
}
}
stream->adpcm_history1_32 = hist1;
@ -192,7 +208,6 @@ void decode_psx_pivotal(VGMSTREAMCHANNEL * stream, sample_t * outbuf, int channe
uint8_t coef_index, shift_factor;
int32_t hist1 = stream->adpcm_history1_32;
int32_t hist2 = stream->adpcm_history2_32;
float scale;
/* external interleave (variable size), mono */
@ -213,21 +228,19 @@ void decode_psx_pivotal(VGMSTREAMCHANNEL * stream, sample_t * outbuf, int channe
if (shift_factor > 12) /* same */
shift_factor = 12;
scale = (float)(1.0 / (double)(1 << shift_factor));
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 */
(nibbles >> 0) & 0x0f :
(nibbles >> 4) & 0x0f;
sample = (int16_t)((sample << 12) & 0xf000); /* 16b sign extend + default scale */
sample = sample*scale + ps_adpcm_coefs_f[coef_index][0]*hist1 + ps_adpcm_coefs_f[coef_index][1]*hist2; /* actually substracts negative coefs but whatevs */
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); /* actually substracts negative coefs but whatevs */
sample >>= 8;
outbuf[sample_count] = clamp16(sample);
outbuf[sample_count] = clamp16(sample); /*clamping*/
sample_count += channelspacing;
hist2 = hist1;