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https://github.com/vgmstream/vgmstream.git
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798d33c295
git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@443 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
#include "meta.h"
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#include "../util.h"
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/* EXST
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PS2 INT format is an interleaved format found in Shadow of the Colossus
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The header start with a EXST id.
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The headers and bgm datas was separated in the game, and joined in order
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to add support for vgmstream
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The interleave value is allways 0x400
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known extensions : .STS
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2008-05-13 - Fastelbja : First version ...
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*/
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VGMSTREAM * init_vgmstream_ps2_exst(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[260];
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int loop_flag=0;
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int channel_count;
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int i;
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/* check extension, case insensitive */
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streamFile->get_name(streamFile,filename,sizeof(filename));
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if (strcasecmp("sts",filename_extension(filename))) goto fail;
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/* check EXST Header */
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if (read_32bitBE(0x00,streamFile) != 0x45585354)
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goto fail;
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/* check loop */
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loop_flag = (read_32bitLE(0x0C,streamFile)==1);
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channel_count=read_16bitLE(0x06,streamFile);
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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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vgmstream->channels = read_16bitLE(0x06,streamFile);
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vgmstream->sample_rate = read_32bitLE(0x08,streamFile);
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/* Compression Scheme */
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vgmstream->coding_type = coding_PSX;
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vgmstream->num_samples = (read_32bitLE(0x14,streamFile)*0x400)/16*28;
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/* Get loop point values */
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if(vgmstream->loop_flag) {
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vgmstream->loop_start_sample = (read_32bitLE(0x10,streamFile)*0x400)/16*28;
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vgmstream->loop_end_sample = (read_32bitLE(0x14,streamFile)*0x400)/16*28;
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}
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vgmstream->interleave_block_size = 0x400;
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vgmstream->layout_type = layout_interleave;
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vgmstream->meta_type = meta_PS2_EXST;
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/* open the file for reading by each channel */
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{
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,0x8000);
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if (!vgmstream->ch[i].streamfile) goto fail;
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vgmstream->ch[i].channel_start_offset=
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vgmstream->ch[i].offset=
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(off_t)(0x78+vgmstream->interleave_block_size*i);
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}
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}
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return vgmstream;
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/* clean up anything we may have opened */
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fail:
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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