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Fixed regression/segfault in multistream .mtaf [MGS3]; cleanup

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Apparently some MTAF ripped with an old tool contain block data, and a
previous change attempted to support them. This broke multistream MTAF
(block header starts with 0x01, and frame header starts with 0x00, but
also 0x01 in multistreams).
Those MTAF should be re-ripped without blocks.
This commit is contained in:
bnnm 2016-12-27 14:35:23 +01:00
parent e6b6a34a67
commit 08a1a50ccb
1 changed files with 63 additions and 47 deletions
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110
src/coding/mtaf_decoder.c
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@ -3,6 +3,8 @@
#include "coding.h"
#include "../util.h"
#define MTAF_BLOCK_SUPPORT 0
// A hybrid of IMA and Yamaha ADPCM found in Metal Gear Solid 3
// Thanks to X_Tra (http://metalgear.in/) for pointing me to the step size table.
@ -81,62 +83,79 @@ static int16_t step_size[32][16] = {
void decode_mtaf(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do, int channel, int channels) {
int32_t sample_count;
unsigned long cur_off = stream->offset;
off_t cur_off = stream->offset;
int i;
int c = channel%2;
int16_t init_idx;
int16_t init_hist;
int c = channel%2; /* global channel to stream channel */
int32_t hist = stream->adpcm_history1_16;
int step_idx = stream->adpcm_step_index;
//printf("channel %d: first_sample = %d, stream->offset = 0x%lx, cur_off = 0x%lx init_idx = %d\n", channel, first_sample, (unsigned long)stream->offset, cur_off, init_idx);
int32_t step_idx = stream->adpcm_step_index;
uint8_t byte = 0;
#if 0
if (init_idx < 0 || init_idx > 31) {
fprintf(stderr, "step idx out of range at 0x%lx ch %d\n", cur_off, c);
exit(1);
}
if (0 != read_16bitLE(cur_off+10+c*4, stream->streamfile)) {
fprintf(stderr, "exp. zero after hist at 0x%lx ch %d\n", cur_off, c);
exit(1);
#if MTAF_BLOCK_SUPPORT
{
/* "macroblock" support (layout/mtaf_block.c) was removed since the extractor now produces clean files;
* this a hack to skip those blocks, left as a reminder (not well tested) */
int unk, size, empty, frames, repeat = 1;
do {
unk = read_32bitLE(cur_off+0x00, stream->streamfile); /* always BE 0x01001100? */
size = read_32bitLE(cur_off+0x04, stream->streamfile); /* block size */
empty = read_32bitLE(cur_off+0x08, stream->streamfile); /* always 0? */
frames = read_32bitLE(cur_off+0x0c, stream->streamfile); /* total frames of 0x110 */
if (unk == 0x00110001 && empty == 0 && size > 0) {
if (frames == 0) {
stream->offset += size; /* full skip */
} else if ((size-0x10) == frames*0x110) {
stream->offset += 0x10; /* header skip */
repeat = 0;
}
cur_off = stream->offset;
}
else {
repeat = 0;
}
} while(repeat);
}
#endif
first_sample = first_sample%0x100;
if (first_sample%0x100 == 0) {
while (read_8bit(cur_off, stream->streamfile) != 0) {
cur_off += 16;
}
stream->offset = cur_off;
first_sample = first_sample % 0x100;
init_idx = read_16bitLE(cur_off+4+c*2, stream->streamfile);
init_hist = read_16bitLE(cur_off+8+c*4, stream->streamfile);
hist = init_hist;
/* read header when we hit a new frame every 0x100 samples */
if (first_sample == 0) {
int32_t init_idx, init_hist;
#if 0
if (step_idx != init_idx) {
fprintf(stderr, "step_idx does not match at 0x%lx, %d!=%d\n",cur_off,step_idx, init_idx);
exit(1);
/* 0x10 header: owner stream, frame count, step-L, step-R, hist-L, hist-R */
/* uint32_t stream = read_8bit(cur_off+0+c*2, stream->streamfile); */ /* 0=first */
/* uint24_t frames = (uint24_t)read_16bitLE(cur_off+1, stream->streamfile); */ /* 1=first */
init_idx = read_16bitLE(cur_off+4+c*2, stream->streamfile); /* step-L/R */
init_hist = read_16bitLE(cur_off+4+4+c*4, stream->streamfile); /* hist-L/R: hist 16bit + empty 16bit */
VGM_ASSERT( read_16bitLE(cur_off+4+4+2+c*4, stream->streamfile) != 0,
"init_hist not 16bit at 0x%lx, ch=%d\n", cur_off, c);
VGM_ASSERT( init_idx < 0 || init_idx > 31,
"init_idx out of range at 0x%lx, ch=%d\n", cur_off, c);
VGM_ASSERT( step_idx != init_idx,
"step_idx does not match init_idx at 0x%lx, step=%d, init=%d\n",cur_off,step_idx, init_idx);
/* avoid index out of range in corrupt files */
if (init_idx < 0) {
init_idx = 0;
} else if (init_idx > 31) {
init_idx = 31;
}
#endif
step_idx = init_idx;
hist = init_hist;
}
for (i=first_sample,sample_count=0; i<first_sample+samples_to_do; i++,sample_count+=channelspacing) {
uint8_t byte, nibble;
byte = read_8bit(cur_off + 0x10 + 0x80*c + i/2, stream->streamfile);
if (i%2!=1)
{
// low nibble first
nibble = byte&0xf;
}
else
{
// high nibble last
uint8_t nibble;
if (i%2 != 1) { /* low nibble first */
byte = read_8bit(cur_off + 0x10 + 0x80*c + i/2, stream->streamfile);
nibble = byte & 0x0f;
} else { /* high nibble last */
nibble = byte >> 4;
}
@ -145,12 +164,9 @@ void decode_mtaf(VGMSTREAMCHANNEL * stream, sample * outbuf, int channelspacing,
outbuf[sample_count] = hist;
step_idx += index_table[nibble];
if (step_idx < 0)
{
if (step_idx < 0) { /* clip step */
step_idx = 0;
}
if (step_idx > 31)
{
} else if (step_idx > 31) {
step_idx = 31;
}
} /* end sample loop */