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64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* VGS - from Princess Soft games [Gin no Eclipse (PS2), Metal Wolf REV (PS2)] */
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VGMSTREAM* init_vgmstream_vgs_ps(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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off_t start_offset;
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size_t data_size, channel_size, interleave, sample_rate;
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int loop_flag, channels;
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int32_t loop_start = 0, loop_end = 0;
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/* check */
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if (!check_extensions(sf,"vgs"))
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goto fail;
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if (!is_id32be(0x00,sf, "VGS\0")) /* 'VAG stereo', presumably (simple VAG clone) */
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goto fail;
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start_offset = 0x30;
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data_size = get_streamfile_size(sf) - start_offset;
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/* test PS-ADPCM null frame for 2nd channel to detect interleave */
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if (read_u32be(0x20000 + start_offset,sf) == 0) {
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interleave = 0x20000; /* common */
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}
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else if (read_u32be(0x8000 + start_offset,sf) == 0) {
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interleave = 0x8000; /* Ishikura Noboru no Igo Kouza: Chuukyuuhen (PS2) */
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}
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else {
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goto fail;
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}
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channels = 2;
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channel_size = read_u32be(0x0c,sf);
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sample_rate = read_s32be(0x10,sf);
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loop_flag = 0; /* all files have loop flags but simply fade out normally and repeat */
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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->meta_type = meta_VGS_PS;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = ps_bytes_to_samples(channel_size, 1);
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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_PSX;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = interleave;
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if (vgmstream->interleave_block_size)
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vgmstream->interleave_last_block_size = (data_size % (vgmstream->interleave_block_size * channels)) / channels;
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read_string(vgmstream->stream_name,0x10+1, 0x20,sf); /* always, can be null */
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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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