vgmstream/src/meta/nds_sad.c

111 lines
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C
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#include "meta.h"
#include "../util.h"
/* sadl (only the Professor Layton interleaved IMA version) */
VGMSTREAM * init_vgmstream_sadl(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
char filename[260];
off_t start_offset;
int loop_flag;
int channel_count;
int coding_type;
/* check extension, case insensitive */
streamFile->get_name(streamFile,filename,sizeof(filename));
if (strcasecmp("sad",filename_extension(filename))) goto fail;
/* check header */
if (read_32bitBE(0x00,streamFile) != 0x7361646c) /* "sadl" */
goto fail;
/* check file size */
if (read_32bitLE(0x40,streamFile) != get_streamfile_size(streamFile) )
goto fail;
/* check coding type */
switch (read_8bit(0x33,streamFile)&0xf0)
{
case 0x70:
coding_type = coding_INT_IMA;
break;
case 0xb0:
coding_type = coding_NDS_PROCYON;
break;
default:
goto fail;
}
loop_flag = read_8bit(0x31,streamFile);
channel_count = read_8bit(0x32,streamFile);
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
start_offset = 0x100;
vgmstream->channels = channel_count;
switch (read_8bit(0x33,streamFile) & 6)
{
case 4:
vgmstream->sample_rate = 32728;
break;
case 2:
vgmstream->sample_rate = 16364;
break;
default:
goto fail;
}
vgmstream->coding_type = coding_type;
if (coding_type == coding_INT_IMA)
vgmstream->num_samples =
(read_32bitLE(0x40,streamFile)-start_offset)/channel_count*2;
else if (coding_type == coding_NDS_PROCYON)
vgmstream->num_samples =
(read_32bitLE(0x40,streamFile)-start_offset)/channel_count/16*30;
vgmstream->interleave_block_size=0x10;
if (loop_flag)
{
if (coding_type == coding_INT_IMA)
vgmstream->loop_start_sample = (read_32bitLE(0x54,streamFile)-start_offset)/channel_count*2;
else
vgmstream->loop_start_sample = (read_32bitLE(0x54,streamFile)-start_offset)/channel_count/16*30;
vgmstream->loop_end_sample = vgmstream->num_samples;
}
if (channel_count > 1)
vgmstream->layout_type = layout_interleave;
else
vgmstream->layout_type = layout_none;
vgmstream->meta_type = meta_SADL;
/* open the file for reading */
{
int i;
STREAMFILE * file;
file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
if (!file) goto fail;
for (i=0;i<channel_count;i++) {
vgmstream->ch[i].streamfile = file;
vgmstream->ch[i].channel_start_offset=
vgmstream->ch[i].offset=start_offset+
vgmstream->interleave_block_size*i;
}
}
return vgmstream;
/* clean up anything we may have opened */
fail:
if (vgmstream) close_vgmstream(vgmstream);
return NULL;
}