vgmstream/src/layout/ea_block.c
2009-09-24 09:59:49 +00:00

150 lines
6.0 KiB
C

#include "layout.h"
#include "../coding/coding.h"
#include "../vgmstream.h"
/* set up for the block at the given offset */
void ea_block_update(off_t block_offset, VGMSTREAM * vgmstream) {
int i;
init_get_high_nibble(vgmstream);
// Search for next SCDL or SCEl block ...
do {
block_offset+=4;
if(block_offset>=(off_t)get_streamfile_size(vgmstream->ch[0].streamfile)) {
vgmstream->next_block_offset=block_offset;
return;
}
} while (read_32bitBE(block_offset,vgmstream->ch[0].streamfile)!=0x5343446C);
// reset channel offset
for(i=0;i<vgmstream->channels;i++) {
vgmstream->ch[i].channel_start_offset=0;
}
vgmstream->current_block_offset = block_offset;
vgmstream->next_block_offset = block_offset+read_32bitLE(block_offset+4,vgmstream->ch[0].streamfile)-4;
if(vgmstream->ea_big_endian) {
vgmstream->current_block_size = read_32bitBE(block_offset+8,vgmstream->ch[0].streamfile);
for(i=0;i<vgmstream->channels;i++) {
vgmstream->ch[i].offset=read_32bitBE(block_offset+0x0C+(i*4),vgmstream->ch[0].streamfile)+(4*vgmstream->channels);
vgmstream->ch[i].offset+=vgmstream->current_block_offset+0x0C;
}
vgmstream->current_block_size /= 28;
} else {
switch(vgmstream->coding_type) {
case coding_PSX:
vgmstream->ch[0].offset=vgmstream->current_block_offset+0x10;
vgmstream->ch[1].offset=(read_32bitLE(block_offset+0x04,vgmstream->ch[0].streamfile)-0x10)/vgmstream->channels;
vgmstream->ch[1].offset+=vgmstream->ch[0].offset;
vgmstream->current_block_size=read_32bitLE(block_offset+0x04,vgmstream->ch[0].streamfile)-0x10;
vgmstream->current_block_size/=vgmstream->channels;
break;
case coding_EA_ADPCM:
vgmstream->current_block_size = read_32bitLE(block_offset+4,vgmstream->ch[0].streamfile);
for(i=0;i<vgmstream->channels;i++) {
vgmstream->ch[i].offset=vgmstream->current_block_offset+0x0C+(4*vgmstream->channels);
vgmstream->ch[i].adpcm_history1_32=(uint32_t)read_16bitLE(vgmstream->current_block_offset+0x0c+(i*4),vgmstream->ch[0].streamfile);
vgmstream->ch[i].adpcm_history2_32=(uint32_t)read_16bitLE(vgmstream->current_block_offset+0x0e +(i*4),vgmstream->ch[0].streamfile);
}
break;
case coding_PCM16BE:
vgmstream->current_block_size = read_32bitLE(block_offset+4,vgmstream->ch[0].streamfile)-0x14;
for(i=0;i<vgmstream->channels;i++) {
vgmstream->ch[i].offset=block_offset+0x14+vgmstream->current_block_size/vgmstream->channels*i;
}
vgmstream->current_block_size/=vgmstream->channels;
break;
case coding_PCM16LE_int:
vgmstream->current_block_size = read_32bitLE(block_offset+4,vgmstream->ch[0].streamfile)-0x0C;
for(i=0;i<vgmstream->channels;i++) {
vgmstream->ch[i].offset=block_offset+0x0C+(i*2);
}
vgmstream->current_block_size/=2;
vgmstream->current_block_size-=2;
break;
case coding_XBOX:
vgmstream->current_block_size = read_32bitLE(block_offset+0x10,vgmstream->ch[0].streamfile);
for(i=0;i<vgmstream->channels;i++) {
vgmstream->ch[i].offset=read_32bitLE(block_offset+0x0C+(i*4),vgmstream->ch[0].streamfile)+(4*vgmstream->channels);
vgmstream->ch[i].offset+=vgmstream->current_block_offset+0x0C;
}
break;
default:
vgmstream->current_block_size = read_32bitLE(block_offset+8,vgmstream->ch[0].streamfile);
for(i=0;i<vgmstream->channels;i++) {
vgmstream->ch[i].offset=read_32bitLE(block_offset+0x0C+(i*4),vgmstream->ch[0].streamfile)+(4*vgmstream->channels);
vgmstream->ch[i].offset+=vgmstream->current_block_offset+0x0C;
}
vgmstream->current_block_size /= 28;
}
}
if((vgmstream->ea_compression_version<3) && (vgmstream->coding_type!=coding_PSX) && (vgmstream->coding_type!=coding_EA_ADPCM) && (vgmstream->coding_type!=coding_XBOX) && (vgmstream->coding_type!=coding_PCM16BE)) {
for(i=0;i<vgmstream->channels;i++) {
if(vgmstream->ea_big_endian) {
vgmstream->ch[i].adpcm_history1_32=read_16bitBE(vgmstream->ch[i].offset,vgmstream->ch[0].streamfile);
vgmstream->ch[i].adpcm_history2_32=read_16bitBE(vgmstream->ch[i].offset+2,vgmstream->ch[0].streamfile);
} else {
vgmstream->ch[i].adpcm_history1_32=read_16bitLE(vgmstream->ch[i].offset,vgmstream->ch[0].streamfile);
vgmstream->ch[i].adpcm_history2_32=read_16bitLE(vgmstream->ch[i].offset+2,vgmstream->ch[0].streamfile);
}
vgmstream->ch[i].offset+=4;
}
}
}
void eacs_block_update(off_t block_offset, VGMSTREAM * vgmstream) {
int i;
off_t block_size=vgmstream->current_block_size;
if(read_32bitBE(block_offset,vgmstream->ch[0].streamfile)==0x31534E6C) {
block_offset+=0x0C;
}
vgmstream->current_block_offset = block_offset;
if(read_32bitBE(block_offset,vgmstream->ch[0].streamfile)==0x31534E64) { /* 1Snd */
block_offset+=4;
if(vgmstream->ea_platform==0)
block_size=read_32bitLE(vgmstream->current_block_offset+0x04,
vgmstream->ch[0].streamfile);
else
block_size=read_32bitBE(vgmstream->current_block_offset+0x04,
vgmstream->ch[0].streamfile);
block_offset+=4;
}
vgmstream->current_block_size=block_size-8;
if(vgmstream->coding_type==coding_EACS_IMA) {
init_get_high_nibble(vgmstream);
vgmstream->current_block_size=read_32bitLE(block_offset,vgmstream->ch[0].streamfile);
for(i=0;i<vgmstream->channels;i++) {
vgmstream->ch[i].adpcm_step_index = read_32bitLE(block_offset+0x04+i*4,vgmstream->ch[0].streamfile);
vgmstream->ch[i].adpcm_history1_32 = read_32bitLE(block_offset+0x04+i*4+(4*vgmstream->channels),vgmstream->ch[0].streamfile);
vgmstream->ch[i].offset = block_offset+0x14;
}
} else {
if(vgmstream->coding_type==coding_PSX) {
for (i=0;i<vgmstream->channels;i++)
vgmstream->ch[i].offset = vgmstream->current_block_offset+8+(i*(vgmstream->current_block_size/2));
} else {
for (i=0;i<vgmstream->channels;i++) {
if(vgmstream->coding_type==coding_PCM16LE_int)
vgmstream->ch[i].offset = block_offset+(i*2);
else
vgmstream->ch[i].offset = block_offset+i;
}
}
vgmstream->current_block_size/=vgmstream->channels;
}
vgmstream->next_block_offset = vgmstream->current_block_offset +
(off_t)block_size;
}