mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-13 15:21:04 +01:00
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
#include "meta.h"
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#include "../util.h"
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#include "../coding/coding.h"
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/* Guerrilla's MSS - Found in ShellShock Nam '67 (PS2/Xbox), Killzone (PS2) */
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VGMSTREAM * init_vgmstream_mss(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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size_t data_size;
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int loop_flag = 0, channel_count;
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/* checks */
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if (!check_extensions(streamFile, "mss"))
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goto fail;
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if (read_32bitBE(0x00,streamFile) != 0x4D435353) /* "MCSS" */
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goto fail;
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loop_flag = 0;
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channel_count = read_16bitLE(0x16,streamFile);
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/* 0x04: version? (always 0x00000100 LE) */
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start_offset = read_32bitLE(0x08,streamFile);
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data_size = read_32bitLE(0x0c,streamFile);
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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 = read_32bitLE(0x10,streamFile);
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/* 0x14(1): 1/2/3/4 if 2/4/6/8ch, 0x15(1): 0/1?, 0x16: ch */
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = read_32bitLE(0x18,streamFile);
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vgmstream->num_samples = read_32bitLE(0x1C,streamFile);
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vgmstream->meta_type = meta_MSS;
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/* no other way to know */
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if (vgmstream->interleave_block_size == 0x4800) {
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vgmstream->coding_type = coding_XBOX_IMA;
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/* in stereo multichannel this value is distance between 2ch pair, but we need
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* interleave*ch = full block (2ch 0x4800 + 2ch 0x4800 = 4ch, 0x4800+4800 / 4 = 0x2400) */
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vgmstream->interleave_block_size = vgmstream->interleave_block_size / 2;
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if (vgmstream->channels > 2 && vgmstream->channels % 2 != 0)
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goto fail; /* only 2ch+..+2ch layout is known */
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/* header values are somehow off? */
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data_size = get_streamfile_size(streamFile) - start_offset;
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vgmstream->num_samples = xbox_ima_bytes_to_samples(data_size, vgmstream->channels);
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}
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else {
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/* 0x800 interleave */
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vgmstream->coding_type = coding_PSX;
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if (vgmstream->num_samples * vgmstream->channels <= data_size)
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vgmstream->num_samples = vgmstream->num_samples / 16 * 28;
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}
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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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