mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-13 15:21:04 +01:00
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
#include "meta.h"
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#include "../util.h"
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/* GBTS : Pop'n'Music 9 Bgm File */
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VGMSTREAM * init_vgmstream_ps2_gbts(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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int loop_flag=0;
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int channel_count;
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off_t start_offset;
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off_t loopStart = 0;
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off_t loopEnd = 0;
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size_t filelength;
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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("gbts",filename_extension(filename))) goto fail;
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/* check loop */
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start_offset=0x801;
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filelength = get_streamfile_size(streamFile);
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do {
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// Loop Start ...
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if(read_8bit(start_offset,streamFile)==0x06) {
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if(loopStart==0) loopStart = start_offset-0x801;
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}
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// Loop End ...
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if(read_8bit(start_offset,streamFile)==0x03) {
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if(loopEnd==0) loopEnd = start_offset-0x801-0x10;
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}
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start_offset+=0x10;
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} while (start_offset<(int32_t)filelength);
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loop_flag = (loopEnd!=0);
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channel_count=read_32bitLE(0x1C,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 = channel_count;
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vgmstream->sample_rate = read_32bitLE(0x18,streamFile);;
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/* Check for Compression Scheme */
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vgmstream->coding_type = coding_PSX;
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vgmstream->num_samples = read_32bitLE(0x0C,streamFile)/16*28/vgmstream->channels;
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vgmstream->interleave_block_size = 0x10;
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/* Get loop point values */
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if(vgmstream->loop_flag) {
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vgmstream->loop_start_sample = (loopStart/(vgmstream->interleave_block_size)*vgmstream->interleave_block_size)/16*28;
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vgmstream->loop_start_sample += (loopStart%vgmstream->interleave_block_size)/16*28;
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vgmstream->loop_start_sample /=vgmstream->channels;
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vgmstream->loop_end_sample = (loopEnd/(vgmstream->interleave_block_size)*vgmstream->interleave_block_size)/16*28;
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vgmstream->loop_end_sample += (loopEnd%vgmstream->interleave_block_size)/16*28;
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vgmstream->loop_end_sample /=vgmstream->channels;
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}
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vgmstream->layout_type = layout_interleave;
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vgmstream->meta_type = meta_PS2_GBTS;
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start_offset = (off_t)0x800;
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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,vgmstream->interleave_block_size);
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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)(start_offset+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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