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https://github.com/vgmstream/vgmstream.git
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63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* AST - from Koei and Marvelous games (same internal dev?) */
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VGMSTREAM * init_vgmstream_ps2_ast(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, variant_type;
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/* check extension */
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if (!check_extensions(streamFile,"ast")) goto fail;
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/* check header */
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if (read_32bitBE(0x00,streamFile) != 0x41535400) /* "AST\0" */
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goto fail;
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/* determine variant (after 0x10 is garbage/code data in type 1 until 0x800, but consistent in all songs) */
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if (read_32bitBE(0x10,streamFile) == 0x00000000 || read_32bitBE(0x10,streamFile) == 0x20002000) {
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variant_type = 1; /* Koei: P.T.O. IV (0x00000000), Naval Ops: Warship Gunner (0x20002000) */
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channel_count = 2;
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}
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else {
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variant_type = 2; /* Marvelous: Katekyoo Hitman Reborn! Dream Hyper Battle!, Binchou-tan: Shiawasegoyomi */
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channel_count = read_32bitLE(0x0C,streamFile);
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}
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loop_flag = 0;
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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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/* fill in the vital statistics */
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if (variant_type == 1) {
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start_offset = 0x800;
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vgmstream->sample_rate = read_32bitLE(0x04,streamFile);
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vgmstream->num_samples = ps_bytes_to_samples(read_32bitLE(0x0C,streamFile)-start_offset,channel_count);
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vgmstream->interleave_block_size = read_32bitLE(0x08,streamFile);
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}
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else if (variant_type == 2) {
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start_offset = 0x100;
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vgmstream->sample_rate = read_32bitLE(0x08,streamFile);
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vgmstream->num_samples = ps_bytes_to_samples(read_32bitLE(0x04,streamFile)-start_offset,channel_count);
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vgmstream->interleave_block_size = read_32bitLE(0x10,streamFile);
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}
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else {
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goto fail;
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}
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vgmstream->layout_type = layout_interleave;
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vgmstream->coding_type = coding_PSX;
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vgmstream->meta_type = meta_PS2_AST;
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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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