mirror of
https://github.com/vgmstream/vgmstream.git
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78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
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#include "meta.h"
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#include "../layout/layout.h"
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#include "../util.h"
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/* STR (Future Cop L.A.P.D.) */
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VGMSTREAM * init_vgmstream_psx_mgav(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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off_t current_chunk;
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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 dataBuffer = 0;
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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("str",filename_extension(filename))) goto fail;
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/* check header */
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if (read_32bitBE(0x00,streamFile) != 0x52565753) /* "RVWS" */
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goto fail;
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loop_flag = 1;
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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 = read_32bitLE(0x4,streamFile);
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vgmstream->channels = channel_count;
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vgmstream->sample_rate = 16000;
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vgmstream->coding_type = coding_PSX;
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vgmstream->layout_type = layout_psx_mgav_blocked;
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vgmstream->meta_type = meta_PSX_MGAV;
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/* open the file for reading */
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{
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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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}
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}
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// calculate samples
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current_chunk = start_offset;
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vgmstream->num_samples = 0;
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while ((current_chunk + start_offset) < (get_streamfile_size(streamFile)))
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{
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dataBuffer = (read_32bitBE(current_chunk,streamFile));
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if (dataBuffer == 0x4D474156) /* "MGAV" */
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{
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psx_mgav_block_update(start_offset,vgmstream);
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vgmstream->num_samples += vgmstream->current_block_size/16*28;
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current_chunk += vgmstream->current_block_size + 0x1C;
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}
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current_chunk += 0x10;
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}
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if (loop_flag) {
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vgmstream->loop_start_sample = 0;
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vgmstream->loop_end_sample = vgmstream->num_samples;
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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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