vgmstream/src/meta/brstm.c

132 lines
4.0 KiB
C
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#include "brstm.h"
#include "../util.h"
VGMSTREAM * init_vgmstream_brstm(const char * const filename) {
VGMSTREAM * vgmstream = NULL;
STREAMFILE * infile = NULL;
coding_t coding_type;
off_t head_offset;
size_t head_length;
int codec_number;
int channel_count;
int loop_flag;
off_t start_offset;
/* check extension, case insensitive */
if (strcasecmp("brstm",filename_extension(filename))) goto fail;
/* try to open the file for header reading */
infile = open_streamfile(filename);
if (!infile) goto fail;
/* check header */
if ((uint32_t)read_32bitBE(0,infile)!=0x5253544D || /* "RSTM" */
(uint32_t)read_32bitBE(4,infile)!=0xFEFF0100)
goto fail;
/* get head offset, check */
head_offset = read_32bitBE(0x10,infile);
if ((uint32_t)read_32bitBE(head_offset,infile)!=0x48454144) /* "HEAD" */
goto fail;
head_length = read_32bitBE(0x14,infile);
/* check type details */
codec_number = read_8bit(head_offset+0x20,infile);
loop_flag = read_8bit(head_offset+0x21,infile);
channel_count = read_8bit(head_offset+0x22,infile);
switch (codec_number) {
case 0:
coding_type = coding_PCM8;
break;
case 1:
coding_type = coding_PCM16BE;
break;
case 2:
coding_type = coding_NGC_DSP;
break;
default:
goto fail;
}
/* TODO: only mono and stereo supported */
if (channel_count < 1 || channel_count > 2) goto fail;
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
vgmstream->num_samples = read_32bitBE(head_offset+0x2c,infile);
vgmstream->sample_rate = (uint16_t)read_16bitBE(head_offset+0x24,infile);
/* channels and loop flag are set by allocate_vgmstream */
vgmstream->loop_start_sample = read_32bitBE(head_offset+0x28,infile);
vgmstream->loop_end_sample = vgmstream->num_samples;
vgmstream->coding_type = coding_type;
if (channel_count==1)
vgmstream->layout_type = layout_none;
else
vgmstream->layout_type = layout_interleave_shortblock;
vgmstream->meta_type = meta_RSTM;
vgmstream->interleave_block_size = read_32bitBE(head_offset+0x38,infile);
vgmstream->interleave_smallblock_size = read_32bitBE(head_offset+0x48,infile);
if (vgmstream->coding_type == coding_NGC_DSP) {
off_t coef_offset;
off_t coef_offset1;
off_t coef_offset2;
int i;
coef_offset1=read_32bitBE(head_offset+0x1c,infile);
coef_offset2=read_32bitBE(head_offset+0x10+coef_offset1,infile);
coef_offset=coef_offset2+0x10;
for (i=0;i<16;i++) {
vgmstream->ch[0].adpcm_coef[i]=read_16bitBE(head_offset+coef_offset+i*2,infile);
}
if (vgmstream->channels==2) {
for (i=0;i<16;i++) {
vgmstream->ch[1].adpcm_coef[i]=read_16bitBE(head_offset+coef_offset+0x38+i*2,infile);
}
}
}
start_offset = read_32bitBE(head_offset+0x30,infile);
close_streamfile(infile); infile=NULL;
/* open the file for reading by each channel */
{
int i;
for (i=0;i<channel_count;i++) {
if (vgmstream->layout_type==layout_interleave_shortblock)
vgmstream->ch[i].streamfile = open_streamfile_buffer(filename,
vgmstream->interleave_block_size);
else
vgmstream->ch[i].streamfile = open_streamfile_buffer(filename,
0x1000);
if (!vgmstream->ch[i].streamfile) goto fail;
vgmstream->ch[i].channel_start_offset=
vgmstream->ch[i].offset=
start_offset + i*vgmstream->interleave_block_size;
}
}
return vgmstream;
/* clean up anything we may have opened */
fail:
if (infile) close_streamfile(infile);
if (vgmstream) close_vgmstream(vgmstream);
return NULL;
}