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https://github.com/vgmstream/vgmstream.git
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55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* SVS - SeqVagStream from Square games [Unlimited Saga (PS2) music] */
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VGMSTREAM * init_vgmstream_svs(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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int channel_count, loop_flag, pitch;
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/* checks */
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/* .svs: header id (probably ok like The Bouncer's .vs) */
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if (!check_extensions(streamFile, "svs"))
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goto fail;
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if (read_32bitBE(0x00,streamFile) != 0x53565300) /* "SVS\0" */
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goto fail;
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/* 0x04: flags (1=stereo?, 2=loop) */
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pitch = read_32bitLE(0x10,streamFile); /* usually 0x1000 = 48000 */
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/* 0x14: volume? */
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/* 0x18: file id (may be null) */
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/* 0x1c: null */
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loop_flag = (read_32bitLE(0x08,streamFile) > 0); /* loop start frame, min is 1 */
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channel_count = 2;
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start_offset = 0x20;
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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->meta_type = meta_SVS;
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vgmstream->sample_rate = round10((48000 * pitch) / 4096); /* music = ~44100, ambience = 48000 (rounding makes more sense but not sure) */
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vgmstream->num_samples = ps_bytes_to_samples(get_streamfile_size(streamFile) - start_offset, channel_count);
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if (loop_flag) {
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vgmstream->loop_start_sample = read_32bitLE(0x08,streamFile) * 28; /* frame count (0x10*ch) */
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vgmstream->loop_end_sample = read_32bitLE(0x0c,streamFile) * 28; /* frame count, (not exact num_samples when no loop) */
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/* start/end on the same frame rarely happens too (ex. file_id 63 SVS), perhaps loop should be +1 */
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}
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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 = 0x10;
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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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