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AD1848: Use the correct algorithm for CS423x ADPCM

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Still has level and DC offset issues, but actual use cases are lacking (all validation was done with ALSA's adpcm conversion plugin)
This commit is contained in:
RichardG867
2025-09-27 16:31:11 -03:00
parent bc41f8bbb6
commit 37eb2cb359
2 changed files with 48 additions and 24 deletions
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6
src/include/86box/snd_ad1848.h
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@@ -66,10 +66,10 @@ typedef struct ad1848_t {
uint8_t enable : 1;
uint8_t irq : 4;
uint8_t dma : 3;
uint8_t adpcm_ref;
int8_t adpcm_step;
int adpcm_predictor[2];
int16_t adpcm_step_index[2];
int freq;
int adpcm_data;
uint8_t adpcm_data;
int adpcm_pos;
uint8_t dma_ff;