54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* AST - from MicroVision lib games [P.T.O. IV (PS2), Naval Ops: Warship Gunner (PS2)] */
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VGMSTREAM* init_vgmstream_ast_mv(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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uint32_t start_offset, data_size, check;
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int loop_flag, channels, interleave, sample_rate;
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/* checks */
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if (!is_id32be(0x00,sf, "AST\0"))
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goto fail;
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if (!check_extensions(sf,"ast"))
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goto fail;
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channels = 2;
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sample_rate = read_s32le(0x04, sf);
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interleave = read_u32le(0x08,sf);
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data_size = read_u32le(0x0c,sf); /* may have garbage */
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check = read_u32be(0x10, sf);
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/* rest: null/garbage */
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loop_flag = 0;
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start_offset = 0x800;
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/* there is a variation in .ikm (Zwei), with loops and different start offset */
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if (check != 0x20002000 && /* NO:WG (garbage up to start) */
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check != 0x00000000) /* PTO4 */
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goto fail;
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channels, 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 = ps_bytes_to_samples(data_size - start_offset, channels);
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vgmstream->interleave_block_size = interleave;
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vgmstream->coding_type = coding_PSX;
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vgmstream->layout_type = layout_interleave;
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vgmstream->meta_type = meta_AST_MV;
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if (!vgmstream_open_stream(vgmstream, sf, 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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