76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
#include "layout.h"
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#include "../coding/coding.h"
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#include "../vgmstream.h"
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/* EA SNS/SPS blocks */
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void block_update_ea_sns(off_t block_offset, VGMSTREAM* vgmstream) {
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STREAMFILE* sf = vgmstream->ch[0].streamfile;
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uint32_t block_id, block_size, block_samples;
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off_t channel_start;
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size_t channel_interleave;
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int i;
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/* EOF reads: signal we have nothing and let the layout fail */
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if (block_offset >= get_streamfile_size(sf)) {
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vgmstream->current_block_offset = block_offset;
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vgmstream->next_block_offset = block_offset;
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vgmstream->current_block_samples = -1;
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return;
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}
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/* always BE */
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block_size = read_32bitBE(block_offset + 0x00,sf);
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/* At 0x00(1): block flag
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* - in SNS: 0x00=normal block, 0x80=last block (not mandatory)
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* - in SPS: 0x48=header, 0x44=normal block, 0x45=last block (empty) */
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block_id = (block_size & 0xFF000000) >> 24;
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block_size &= 0x00FFFFFF;
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if (block_id == 0x00 || block_id == 0x80 || block_id == 0x44) {
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block_samples = read_32bitBE(block_offset + 0x04, sf);
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} else {
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block_samples = 0;
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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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/* no need to setup offsets (plus could read over filesize near EOF) */
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if (block_samples == 0)
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return;
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switch (vgmstream->coding_type) {
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case coding_PCM16_int:
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channel_start = 0x00;
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channel_interleave = 0x02;
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break;
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case coding_NGC_DSP:
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/* 0x04: unknown (0x00/02), 0x08: some size?, 0x34: null? */
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channel_start = read_32bitBE(block_offset + 0x08 + 0x00, sf);
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channel_interleave = read_32bitBE(block_offset + 0x08 + 0x0c, sf);
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/* guessed as all known EA DSP only have one block with subheader (maybe changes coefs every block?) */
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if (channel_start >= 0x40) {
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dsp_read_coefs_be(vgmstream, sf, block_offset + 0x08 + 0x10, 0x28);
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dsp_read_hist_be(vgmstream, sf, block_offset + 0x08 + 0x30, 0x28);//todo guessed and doesn't fix clicks in full loops
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}
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break;
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default:
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channel_start = 0x00;
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channel_interleave = 0x00;
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break;
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}
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for (i = 0; i < vgmstream->channels; i++) {
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vgmstream->ch[i].offset = block_offset + 0x08 + channel_start + i * channel_interleave;
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/* also fix first offset (for EALayer3) */
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if (block_offset == vgmstream->ch[i].channel_start_offset) {
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vgmstream->ch[i].channel_start_offset = vgmstream->ch[i].offset;
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}
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}
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}
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