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https://github.com/vgmstream/vgmstream.git
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39 lines
1.4 KiB
C
39 lines
1.4 KiB
C
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#include "layout.h"
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#include "../coding/coding.h"
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#include "../vgmstream.h"
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/* EA "SNS "blocks (most common in .SNS) */
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void ea_sns_block_update(off_t block_offset, VGMSTREAM * vgmstream) {
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STREAMFILE* streamFile = vgmstream->ch[0].streamfile;
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uint32_t block_size, block_samples;
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size_t file_size = get_streamfile_size(streamFile);
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int i;
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/* always BE */
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block_size = read_32bitBE(block_offset + 0x00,streamFile);
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block_samples = read_32bitBE(block_offset + 0x04,streamFile);
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/* EOF */
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if (block_size == 0 || block_offset >= file_size) {
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vgmstream->current_block_offset = file_size;
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vgmstream->next_block_offset = file_size + 0x04;
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vgmstream->current_block_samples = vgmstream->num_samples;
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return;
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}
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/* known: 0x80 = last block, 0x40, 0x08, 0x04, 0x01 */
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if (block_size & 0xFF000000) {
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VGM_ASSERT(!(block_size & 0x80000000), "EA SNS: unknown flag found at %lx\n", block_offset);
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block_size &= 0x00FFFFFF;
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}
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for (i = 0; i < vgmstream->channels; i++) {
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off_t channel_start = 0x00;
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vgmstream->ch[i].offset = block_offset + 0x08 + channel_start;
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}
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vgmstream->current_block_offset = block_offset;
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vgmstream->next_block_offset = block_offset + block_size;
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vgmstream->current_block_samples = block_samples;
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}
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