mirror of
https://github.com/vgmstream/vgmstream.git
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f303c080ac
.vs added (incomplete) git-svn-id: https://vgmstream.svn.sourceforge.net/svnroot/vgmstream@497 51a99a44-fe44-0410-b1ba-c3e57ba2b86b
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
#include "meta.h"
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#include "../util.h"
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/* VGS (from Guitar Hero Encore - Rocks the 80s) */
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VGMSTREAM * init_vgmstream_vgs(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[260];
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off_t start_offset;
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int loop_flag;
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int channel_flag;
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int channel_flag_offset;
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int channel_count;
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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("vgs",filename_extension(filename))) goto fail;
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/* check header */
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if (read_32bitBE(0x00,streamFile) != 0x56675321) /* "VgS!" */
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goto fail;
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loop_flag = 0;
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channel_flag_offset = get_streamfile_size(streamFile)-0x10;
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channel_flag = read_32bitBE(channel_flag_offset,streamFile);
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/* Only seen files up to 5 channels, but just
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to be sure we will look up to 8 chanels */
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switch (channel_flag) {
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case 0x00800000:
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channel_count = 1;
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break;
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case 0x00810000:
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channel_count = 2;
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break;
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case 0x00820000:
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channel_count = 3;
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break;
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case 0x00830000:
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channel_count = 4;
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break;
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case 0x00840000:
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channel_count = 5;
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break;
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case 0x00850000:
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channel_count = 6;
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break;
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case 0x00860000:
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channel_count = 7;
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break;
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case 0x00870000:
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channel_count = 8;
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break;
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default:
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goto fail;
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}
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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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start_offset = 0x80;
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = read_32bitLE(0x08,streamFile);
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vgmstream->coding_type = coding_PSX_badflags;
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vgmstream->num_samples = (read_32bitLE(0x0C,streamFile)*channel_count*0x10)*28/16/channel_count;
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if (loop_flag) {
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vgmstream->loop_start_sample = 0;
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vgmstream->loop_end_sample = (read_32bitLE(0x0C,streamFile)*channel_count*0x10)*28/16/channel_count;
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}
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 0x10;
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vgmstream->meta_type = meta_VGS;
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/* open the file for reading */
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{
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int i;
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STREAMFILE * file;
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file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!file) goto fail;
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = file;
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vgmstream->ch[i].channel_start_offset=
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vgmstream->ch[i].offset=start_offset+
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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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