mirror of
https://github.com/vgmstream/vgmstream.git
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55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
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#include "layout.h"
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#include "../vgmstream.h"
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/* set up for the block at the given offset */
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void str_ctrl_block_update(off_t block_offset, VGMSTREAM * vgmstream) {
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off_t current_chunk;
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size_t file_size;
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int i;
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STREAMFILE *streamfile;
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int FoundSSMP = 0;
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off_t SSMP_offset = -1;
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current_chunk = block_offset;
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streamfile = vgmstream->ch[0].streamfile;
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file_size = get_streamfile_size(streamfile);
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/* we may have to skip some chunks */
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while (!FoundSSMP && current_chunk < file_size) {
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if (current_chunk+read_32bitBE(current_chunk+4,streamfile)>=file_size)
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break;
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switch (read_32bitBE(current_chunk,streamfile)) {
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case 0x534e4453: /* SNDS */
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/* SSMP */
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if (read_32bitBE(current_chunk+0x10,streamfile)==0x53534d50) {
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FoundSSMP = 1;
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SSMP_offset = current_chunk;
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}
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break;
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case 0x46494c4c: /* FILL, the main culprit */
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default:
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break;
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}
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current_chunk += read_32bitBE(current_chunk+4,streamfile);
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}
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if (!FoundSSMP) {
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/* if we couldn't find it all we can do is try playing the current
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* block, which is going to suck */
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vgmstream->current_block_offset = block_offset;
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}
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vgmstream->current_block_offset = SSMP_offset;
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vgmstream->current_block_size = (read_32bitBE(
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vgmstream->current_block_offset+4,
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vgmstream->ch[0].streamfile) - 0x18) * vgmstream->channels;
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vgmstream->next_block_offset = vgmstream->current_block_offset +
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read_32bitBE(vgmstream->current_block_offset+4,
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vgmstream->ch[0].streamfile);
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for (i=0;i<vgmstream->channels;i++) {
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vgmstream->ch[i].offset = vgmstream->current_block_offset + 0x18;
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}
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}
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