mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-19 18:05:52 +01:00
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
#include "meta.h"
|
|
#include "../util.h"
|
|
#include "../coding/coding.h"
|
|
|
|
/* .rsf - from Metroid Prime (GC) */
|
|
VGMSTREAM* init_vgmstream_raw_rsf(STREAMFILE* sf) {
|
|
VGMSTREAM* vgmstream = NULL;
|
|
int channels, loop_flag;
|
|
uint32_t interleave, file_size;
|
|
|
|
/* checks */
|
|
if (!check_extensions(sf,"rsf"))
|
|
return NULL;
|
|
|
|
/* this is all we have to go on, rsf is completely headerless */
|
|
file_size = get_streamfile_size(sf);
|
|
interleave = (file_size + 1) / 2;
|
|
|
|
/* G.721 has no zero nibbles, so we look at the first few bytes
|
|
* (known files start with 0xFFFFFFFF, but probably an oddity of the codec) */
|
|
{
|
|
uint8_t test_byte;
|
|
off_t i;
|
|
|
|
/* 0x20 is arbitrary, all files are much larger */
|
|
for (i = 0; i < 0x20; i++) {
|
|
test_byte = read_u8(i,sf);
|
|
if (!(test_byte&0xf) || !(test_byte&0xf0)) goto fail;
|
|
}
|
|
|
|
/* and also check start of second channel */
|
|
for (i = interleave; i < interleave + 0x20; i++) {
|
|
test_byte = read_u8(i,sf);
|
|
if (!(test_byte&0xf) || !(test_byte&0xf0)) goto fail;
|
|
}
|
|
}
|
|
|
|
channels = 2;
|
|
loop_flag = 0;
|
|
|
|
|
|
/* build the VGMSTREAM */
|
|
vgmstream = allocate_vgmstream(channels, loop_flag);
|
|
if (!vgmstream) goto fail;
|
|
|
|
vgmstream->num_samples = file_size;
|
|
vgmstream->sample_rate = 32000;
|
|
|
|
vgmstream->coding_type = coding_G721;
|
|
vgmstream->layout_type = layout_none;
|
|
vgmstream->meta_type = meta_RSF;
|
|
|
|
if (!vgmstream_open_stream(vgmstream, sf, 0))
|
|
goto fail;
|
|
|
|
/* open the file for reading by each channel */
|
|
{
|
|
int i;
|
|
for (i = 0; i < channels; i++) {
|
|
vgmstream->ch[i].channel_start_offset= vgmstream->ch[i].offset = interleave * i;
|
|
g72x_init_state(&(vgmstream->ch[i].g72x_state));
|
|
}
|
|
}
|
|
|
|
return vgmstream;
|
|
fail:
|
|
close_vgmstream(vgmstream);
|
|
return NULL;
|
|
}
|