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