mirror of
https://github.com/vgmstream/vgmstream.git
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68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
#include "meta.h"
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#include "../util.h"
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/* GUN (Gunvari Streams) */
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VGMSTREAM * init_vgmstream_ps2_mcg(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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off_t start_offset;
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int loop_flag = 0;
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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("mcg",filename_extension(filename))) goto fail;
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/* check header */
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if (!((read_32bitBE(0x00,streamFile) == 0x4D434700) &&
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(read_32bitBE(0x20,streamFile) == 0x56414770) &&
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(read_32bitBE(0x50,streamFile) == 0x56414770)))
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goto fail;
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loop_flag = (read_32bitLE(0x34,streamFile)!=0);
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channel_count = 2;
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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_32bitBE(0x30,streamFile);
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vgmstream->coding_type = coding_PSX;
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vgmstream->num_samples = read_32bitBE(0x2C,streamFile)/16*14*channel_count;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = read_32bitLE(0x14,streamFile);
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vgmstream->meta_type = meta_PS2_MCG;
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if (vgmstream->loop_flag)
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{
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vgmstream->loop_start_sample = read_32bitLE(0x34,streamFile);
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vgmstream->loop_end_sample = vgmstream->num_samples;
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}
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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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