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https://github.com/vgmstream/vgmstream.git
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104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* EXST - from Sony games [Shadow of the Colossus (PS2), Gacha Mecha Stadium Saru Battle (PS2)] */
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VGMSTREAM* init_vgmstream_exst(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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STREAMFILE* sf_body = NULL;
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off_t start_offset;
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int loop_flag, channels, sample_rate;
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int32_t interleave, num_samples, loop_start, loop_end;
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size_t data_size;
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int is_cp3 = 0;
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/* checks */
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/* .sts+int: standard [Shadow of the Colossus (PS2)] (some fake .sts have manually joined header+body)
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* .x: header+body [Ape Escape 3 (PS2)]
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* .sts_cp3+int_cp3: Shadow of the Colossus (PS3) */
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if (!check_extensions(sf, "sts,sts_cp3,x"))
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goto fail;
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if (!is_id32be(0x00,sf, "EXST"))
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goto fail;
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/* also detectable since PS2 .sts uses blocks and PS3 offsets */
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is_cp3 = check_extensions(sf, "sts_cp3");
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if (is_cp3)
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sf_body = open_streamfile_by_ext(sf,"int_cp3");
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else
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sf_body = open_streamfile_by_ext(sf,"int");
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if (sf_body) {
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/* separate header+body (header is 0x78) */
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start_offset = 0x00;
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data_size = get_streamfile_size(sf_body);
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}
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else {
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/* joint header+body (.x and assumed .sts) */
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start_offset = 0x78;
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data_size = get_streamfile_size(sf);
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/* Gacharoku 2 has header+data but padded header (ELF has pointers + size to SOUND.PCK, and
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* treats them as single files, no extension but there are Sg2ExStAdpcm* calls in the ELF) */
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if ((data_size % 0x10) == 0)
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start_offset = 0x80;
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if (data_size <= start_offset)
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goto fail;
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data_size = data_size - start_offset;
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}
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channels = read_u16le(0x06,sf);
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sample_rate = read_u32le(0x08,sf);
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loop_flag = read_u32le(0x0C,sf);
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loop_start = read_u32le(0x10,sf);
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loop_end = read_u32le(0x14,sf);
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/* 0x18: 0x24 config per channel? (volume+panning+etc?) */
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/* rest is padding up to 0x78 */
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if (!is_cp3) {
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interleave = 0x400;
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loop_flag = (loop_flag == 1);
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num_samples = ps_bytes_to_samples(data_size, channels); /* same or very close to loop end */
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loop_start = ps_bytes_to_samples(loop_start * interleave * channels, channels); /* blocks */
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loop_end = ps_bytes_to_samples(loop_end * interleave * channels, channels); /* blocks */
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}
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else {
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interleave = 0x10;
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loop_flag = !(loop_start == 0 && loop_end == data_size); /* flag always set even for jingles */
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num_samples = ps_bytes_to_samples(data_size, channels); /* not same as loop end */
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loop_start = ps_bytes_to_samples(loop_start, channels); /* offset */
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loop_end = ps_bytes_to_samples(loop_end, channels); /* offset */
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}
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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_EXST;
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vgmstream->sample_rate = sample_rate;
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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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vgmstream->num_samples = num_samples;
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vgmstream->loop_start_sample = loop_start;
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vgmstream->loop_end_sample = loop_end;
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if (!vgmstream_open_stream(vgmstream, sf_body ? sf_body : sf, start_offset))
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goto fail;
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close_streamfile(sf_body);
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return vgmstream;
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fail:
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close_streamfile(sf_body);
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close_vgmstream(vgmstream);
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return NULL;
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}
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