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Minor FADPCM cleanup

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This commit is contained in:
bnnm 2018-03-08 22:55:50 +01:00
parent b8641db34c
commit 67a2f29f75
3 changed files with 19 additions and 23 deletions
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32
src/coding/fadpcm_decoder.c
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@ -1,5 +1,5 @@
#include "coding.h"
#include "../util.h"
/* FADPCM table */
static const int8_t fadpcm_coefs[8][2] = {
@ -20,7 +20,7 @@ void decode_fadpcm(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacin
off_t frame_offset;
int i, j, k;
int block_samples, num_frame, samples_done = 0, sample_count = 0;
int coef_index[8], shift_factor[8];
uint32_t coefs, shifts;
int32_t hist1; //= stream->adpcm_history1_32;
int32_t hist2; //= stream->adpcm_history2_32;
@ -32,29 +32,25 @@ void decode_fadpcm(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacin
frame_offset = stream->offset + 0x8c*num_frame;
/* parse 0xc header */
{
uint32_t coefs, shifts;
/* parse 0xc header (header samples are not written to outbuf) */
coefs = read_32bitLE(frame_offset + 0x00, stream->streamfile);
shifts = read_32bitLE(frame_offset + 0x04, stream->streamfile);
hist1 = read_16bitLE(frame_offset + 0x08, stream->streamfile);
hist2 = read_16bitLE(frame_offset + 0x0a, stream->streamfile);
/* decode nibbles, grouped in 8 sets of 0x10 * 0x04 * 2 */
for (i = 0; i < 8; i++) {
coef_index[i] = (coefs >> i*4) & 0x0f;
shift_factor[i] = (shifts >> i*4) & 0x0f;
}
/* header samples are not written to outbuf */
}
/* decode nibbles, grouped in 0x10 * 0x04 * 2 */
for (i = 0; i < 8; i++) {
int32_t coef1, coef2, shift, coef_index, shift_factor;
off_t group_offset = frame_offset + 0x0c + 0x10*i;
int32_t coef1 = fadpcm_coefs[(coef_index[i] % 0x07)][0]; /* indexes > 7 are repeats (ex. 0x9 is 0x2) */
int32_t coef2 = fadpcm_coefs[(coef_index[i] % 0x07)][1];
int32_t shift = 0x16 - shift_factor[i];
/* each set has its own coefs/shifts (indexes > 7 are repeat, ex. 0x9 is 0x2) */
coef_index = ((coefs >> i*4) & 0x0f) % 0x07;
shift_factor = (shifts >> i*4) & 0x0f;
coef1 = fadpcm_coefs[coef_index][0];
coef2 = fadpcm_coefs[coef_index][1];
shift = 0x16 - shift_factor;
for (j = 0; j < 4; j++) {
uint32_t nibbles = read_32bitLE(group_offset + 0x04*j, stream->streamfile);

2
src/formats.c
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@ -500,7 +500,7 @@ static const coding_info coding_info_list[] = {
{coding_MTAF, "Konami MTAF 4-bit ADPCM"},
{coding_MTA2, "Konami MTA2 4-bit ADPCM"},
{coding_MC3, "Paradigm MC3 3-bit ADPCM"},
{coding_FADPCM, "FMOD FADPCM 4-bit ADCPM"},
{coding_FADPCM, "FMOD FADPCM 4-bit ADPCM"},
{coding_SDX2, "Squareroot-delta-exact (SDX2) 8-bit DPCM"},
{coding_SDX2_int, "Squareroot-delta-exact (SDX2) 8-bit DPCM with 1 byte interleave"},

2
src/vgmstream.h
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@ -152,7 +152,7 @@ typedef enum {
coding_MTAF, /* Konami MTAF ADPCM */
coding_MTA2, /* Konami MTA2 ADPCM */
coding_MC3, /* Paradigm MC3 3-bit ADPCM */
coding_FADPCM, /* FMOD FADPCM 4-bit ADCPM */
coding_FADPCM, /* FMOD FADPCM 4-bit ADPCM */
/* others */
coding_SDX2, /* SDX2 2:1 Squareroot-Delta-Exact compression DPCM */