80486DX2-66/86Box-fork
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Implement ESPCM_3 decoding

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This commit is contained in:
Kagamiin~
2024-03-13 11:39:56 -03:00
parent e2200f8d75
commit 9d54a78918
2 changed files with 91 additions and 1 deletions
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1
src/include/86box/snd_sb_dsp.h
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@@ -153,6 +153,7 @@ typedef struct sb_dsp_t {
uint8_t espcm_range;
uint8_t espcm_byte_buffer[4];
uint8_t espcm_code_buffer[10]; /* used for ESPCM_3 */
uint8_t espcm_table_index; /* used for ESPCM_3 */
uint8_t espcm_last_value; /* used for ESPCM_3 */
mpu_t *mpu;

91
src/sound/snd_sb_dsp.c
View File

@@ -2301,7 +2301,96 @@ pollsb(void *priv)
break;
case ESPCM_3:
// TODO
if (dsp->espcm_sample_idx >= 19)
{
dsp->espcm_sample_idx = 0;
}
if (dsp->espcm_sample_idx == 0)
{
dsp->espcm_byte_buffer[0] = dsp->dma_readb(dsp->dma_priv);
dsp->sb_8_length--;
dsp->ess_dma_counter++;
dsp->espcm_sample_idx++;
dsp->espcm_range = dsp->espcm_byte_buffer[0] & 0x0F;
tempi = dsp->espcm_byte_buffer[0] >> 4;
dsp->espcm_last_value = tempi;
}
else if (dsp->espcm_sample_idx == 1)
{
for (tempi = 0; tempi < 4; tempi++)
{
dsp->espcm_byte_buffer[tempi] = dsp->dma_readb(dsp->dma_priv);
dsp->sb_8_length--;
dsp->ess_dma_counter++;
}
dsp->espcm_table_index = dsp->espcm_byte_buffer[0] & 0x03;
dsp->espcm_code_buffer[0] = (dsp->espcm_byte_buffer[0] >> 2) & 0x07;
dsp->espcm_code_buffer[1] = (dsp->espcm_byte_buffer[0] >> 5) & 0x07;
dsp->espcm_code_buffer[2] = (dsp->espcm_byte_buffer[1]) & 0x07;
dsp->espcm_code_buffer[3] = (dsp->espcm_byte_buffer[1] >> 3) & 0x07;
dsp->espcm_code_buffer[4] = ((dsp->espcm_byte_buffer[1] >> 6) & 0x03) | ((dsp->espcm_byte_buffer[2] & 0x01) << 2);
dsp->espcm_code_buffer[5] = (dsp->espcm_byte_buffer[2] >> 1) & 0x07;
dsp->espcm_code_buffer[6] = (dsp->espcm_byte_buffer[2] >> 4) & 0x07;
dsp->espcm_code_buffer[7] = ((dsp->espcm_byte_buffer[2] >> 7) & 0x01) | ((dsp->espcm_byte_buffer[3] & 0x03) << 1);
dsp->espcm_code_buffer[8] = (dsp->espcm_byte_buffer[3] >> 2) & 0x07;
dsp->espcm_code_buffer[9] = (dsp->espcm_byte_buffer[3] >> 5) & 0x07;
tempi = (dsp->espcm_table_index << 8) | (dsp->espcm_last_value << 3) | dsp->espcm_code_buffer[0];
tempi = espcm3_dpcm_tables[tempi];
dsp->espcm_last_value = tempi;
dsp->espcm_sample_idx++;
}
else if (dsp->espcm_sample_idx == 11)
{
for (tempi = 1; tempi < 4; tempi++)
{
dsp->espcm_byte_buffer[tempi] = dsp->dma_readb(dsp->dma_priv);
dsp->sb_8_length--;
dsp->ess_dma_counter++;
}
dsp->espcm_code_buffer[0] = (dsp->espcm_byte_buffer[1]) & 0x07;
dsp->espcm_code_buffer[1] = (dsp->espcm_byte_buffer[1] >> 3) & 0x07;
dsp->espcm_code_buffer[2] = ((dsp->espcm_byte_buffer[1] >> 6) & 0x03) | ((dsp->espcm_byte_buffer[2] & 0x01) << 2);
dsp->espcm_code_buffer[3] = (dsp->espcm_byte_buffer[2] >> 1) & 0x07;
dsp->espcm_code_buffer[4] = (dsp->espcm_byte_buffer[2] >> 4) & 0x07;
dsp->espcm_code_buffer[5] = ((dsp->espcm_byte_buffer[2] >> 7) & 0x01) | ((dsp->espcm_byte_buffer[3] & 0x03) << 1);
dsp->espcm_code_buffer[6] = (dsp->espcm_byte_buffer[3] >> 2) & 0x07;
dsp->espcm_code_buffer[7] = (dsp->espcm_byte_buffer[3] >> 5) & 0x07;
tempi = (dsp->espcm_table_index << 8) | (dsp->espcm_last_value << 3) | dsp->espcm_code_buffer[0];
tempi = espcm3_dpcm_tables[tempi];
dsp->espcm_last_value = tempi;
dsp->espcm_sample_idx++;
}
else
{
tempi = (dsp->espcm_table_index << 8) | (dsp->espcm_last_value << 3) | dsp->espcm_code_buffer[(dsp->espcm_sample_idx - 1) % 10];
tempi = espcm3_dpcm_tables[tempi];
dsp->espcm_last_value = tempi;
dsp->espcm_sample_idx++;
}
tempi |= (dsp->espcm_range << 4);
data[0] = espcm_range_map[tempi];
dsp->sbdat = data[0] << 8;
if (dsp->stereo)
{
sb_dsp_log("pollsb: ESPCM 3, dsp->stereo, %s channel, %04X\n",
dsp->sbleftright ? "left" : "right", dsp->sbdat);
if (dsp->sbleftright)
dsp->sbdatl = dsp->sbdat;
else
dsp->sbdatr = dsp->sbdat;
dsp->sbleftright = !dsp->sbleftright;
}
else
{
dsp->sbdatl = dsp->sbdatr = dsp->sbdat;
}
break;
case ESPCM_1: