mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-14 07:32:52 +01:00
105 lines
3.9 KiB
C
105 lines
3.9 KiB
C
#include "meta.h"
|
|
#include "../util.h"
|
|
|
|
|
|
/* MTA2 - found in Metal Gear Solid 4 */
|
|
VGMSTREAM * init_vgmstream_ps3_mta2(STREAMFILE *streamFile) {
|
|
VGMSTREAM * vgmstream = NULL;
|
|
off_t header_offset, start_offset;
|
|
int loop_flag, channel_count, sample_rate; //block_offset;
|
|
int32_t loop_start, loop_end;
|
|
|
|
|
|
/* check extension */
|
|
/* .mta2: normal file, .bgm: mta2 with block layout, .dbm: iPod metadata + block layout mta2 */
|
|
if ( !check_extensions(streamFile,"mta2,bgm,dbm"))
|
|
goto fail;
|
|
|
|
/* base header (everything is very similar to MGS3's MTAF but BE) */
|
|
if (read_32bitBE(0x00,streamFile) == 0x4d544132) { /* "MTA2" (.mta) */
|
|
//block_offset = 0;
|
|
header_offset = 0x00;
|
|
} else if (read_32bitBE(0x20,streamFile) == 0x4d544132) { /* "MTA2" @ 0x20 (.bgm) */
|
|
//block_offset = 0x10;
|
|
header_offset = 0x20;
|
|
} else if (read_32bitBE(0x00, streamFile) == 0x444C424D
|
|
&& read_32bitBE(0x820,streamFile) == 0x4d544132) { /* "DLBM" + "MTA2" @ 0x820 (.dbm) */
|
|
//block_offset = 0x810;
|
|
header_offset = 0x820;
|
|
} else {
|
|
goto fail;
|
|
}
|
|
/* 0x04(4): file size -4-4 (not including block headers in case of block layout) */
|
|
/* 0x08(4): version? (1), 0x0c(52): null */
|
|
|
|
|
|
/* HEAD chunk */
|
|
if (read_32bitBE(header_offset+0x40, streamFile) != 0x48454144) /* "HEAD" */
|
|
goto fail;
|
|
if (read_32bitBE(header_offset+0x44, streamFile) != 0xB0) /* HEAD size */
|
|
goto fail;
|
|
|
|
|
|
|
|
/* 0x48(4): null, 0x4c: ? (0x10), 0x50(4): 0x7F (vol?), 0x54(2): 0x40 (pan?) */
|
|
channel_count = read_16bitBE(header_offset+0x56, streamFile); /* counting all tracks */
|
|
/* 0x60(4): full block size (0x110 * channels), indirectly channels_per_track = channels / (block_size / 0x110) */
|
|
/* 0x80 .. 0xf8: null */
|
|
|
|
loop_start = read_32bitBE(header_offset+0x58, streamFile);
|
|
loop_end = read_32bitBE(header_offset+0x5c, streamFile);
|
|
loop_flag = (loop_start != loop_end); /* also flag possibly @ 0x73 */
|
|
#if 0
|
|
/* those values look like some kind of loop offsets */
|
|
if (loop_start/0x100 != read_32bitBE(header_offset+0x68, streamFile) ||
|
|
loop_end /0x100 != read_32bitBE(header_offset+0x6C, streamFile) ) {
|
|
VGM_LOG("MTA2: wrong loop points\n");
|
|
goto fail;
|
|
}
|
|
#endif
|
|
|
|
sample_rate = read_32bitBE(header_offset+0x7c, streamFile);
|
|
if (sample_rate) { /* sample rate in 32b float (WHY?) typically 48000.0 */
|
|
float sample_float;
|
|
memcpy(&sample_float, &sample_rate, 4);
|
|
sample_rate = (int)sample_float;
|
|
} else { /* default when not specified (most of the time) */
|
|
sample_rate = 48000;
|
|
}
|
|
|
|
|
|
/* TRKP chunks (x16) */
|
|
/* just seem to contain pan/vol stuff (0x7f/0x40), TRKP per track (sometimes +1 main track?) */
|
|
/* there is channel layout bitmask @ 0x0f (ex. 1ch = 0x04, 3ch = 0x07, 4ch = 0x33, 6ch = 0x3f), surely:
|
|
* FRONT_L = 0x01, FRONT_R = 0x02, FRONT_M = 0x04, BACK_L = 0x08, BACK_R = 0x10, BACK_M = 0x20 */
|
|
|
|
/* DATA chunk */
|
|
if (read_32bitBE(header_offset+0x7f8, streamFile) != 0x44415441) // "DATA"
|
|
goto fail;
|
|
/* 0x7fc: data size (without blocks in case of blocked layout) */
|
|
|
|
start_offset = header_offset + 0x800;
|
|
|
|
/* build the VGMSTREAM */
|
|
vgmstream = allocate_vgmstream(channel_count,loop_flag);
|
|
if (!vgmstream) goto fail;
|
|
|
|
vgmstream->sample_rate = sample_rate;
|
|
vgmstream->num_samples = loop_end;
|
|
vgmstream->loop_start_sample = loop_start;
|
|
vgmstream->loop_end_sample = loop_end;
|
|
|
|
vgmstream->coding_type = coding_MTA2;
|
|
vgmstream->layout_type = layout_none;
|
|
vgmstream->meta_type = meta_PS3_MTA2;
|
|
|
|
/* open the file for reading */
|
|
if ( !vgmstream_open_stream(vgmstream, streamFile, start_offset) )
|
|
goto fail;
|
|
return vgmstream;
|
|
|
|
fail:
|
|
close_vgmstream(vgmstream);
|
|
return NULL;
|
|
}
|