78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
#include "meta.h"
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#include "../util.h"
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/* MTAF - found in Metal Gear Solid 3: Snake Eater (PS2), Subsistence and HD too */
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VGMSTREAM * init_vgmstream_mtaf(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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int loop_flag, channel_count;
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int32_t loop_start, loop_end;
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/* checks */
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if ( !check_extensions(streamFile,"mtaf"))
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goto fail;
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if (read_32bitBE(0x00, streamFile) != 0x4d544146) /* "MTAF" */
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goto fail;
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/* 0x04(4): pseudo file size (close but smaller) */
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/* 0x08(4): version? (0), 0x0c(20): null, 0x30(32): some kind of id or config? */
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/* HEAD chunk */
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if (read_32bitBE(0x40, streamFile) != 0x48454144) /* "HEAD" */
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goto fail;
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if (read_32bitLE(0x44, streamFile) != 0xB0) /* HEAD size */
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goto fail;
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/* 0x48(4): null, 0x4c: usually channel count (sometimes 0x10 with 2ch), 0x50(4): 0x7F (vol?), 0x54(2): 0x40 (pan?) */
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channel_count = 2 * read_8bit(0x61, streamFile); /* 0x60(4): full block size (0x110 * channels), but this works */
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/* 0x70(4): ? (00/05/07), 0x80 .. 0xf8: null */
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loop_start = read_32bitLE(0x58, streamFile);
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loop_end = read_32bitLE(0x5c, streamFile);
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loop_flag = read_32bitLE(0x70, streamFile) & 1;
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/* check loop points vs frame counts */
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if (loop_start/0x100 != read_32bitLE(0x64, streamFile) ||
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loop_end /0x100 != read_32bitLE(0x68, streamFile) ) {
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VGM_LOG("MTAF: wrong loop points\n");
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goto fail;
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}
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/* TRKP chunks (x16) */
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/* just seem to contain pan/vol stuff (0x7f/0x40), one TRKP with data per channel and the rest fixed values */
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/* DATA chunk */
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if (read_32bitBE(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 = 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 = 48000; /* always */
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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_MTAF;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 0x110 / 2; /* kinda hacky for MTAF (stereo codec) track layout */
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vgmstream->meta_type = meta_MTAF;
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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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