vgmstream/src/meta/sts.c
2021-08-07 22:25:45 +02:00

56 lines
1.6 KiB
C

#include "meta.h"
#include "../coding/coding.h"
/* .STS - from Alfa System games [Shikigami no Shiro 3 (Wii)] */
VGMSTREAM* init_vgmstream_sts(STREAMFILE* sf) {
VGMSTREAM* vgmstream = NULL;
uint32_t start_offset, data_size, channel_size;
int loop_flag, channels, sample_rate;
/* checks */
if (!check_extensions(sf, "sts"))
goto fail;
data_size = read_u32be(0x00,sf);
if (data_size + 0x04 != get_streamfile_size(sf))
goto fail;
channels = read_u8(0x08,sf) + 1;
sample_rate = read_u16be(0x0c,sf);
/* 0x10: dsp related? */
/* 0x16: usable size */
channel_size = read_u32be(0x1a,sf);
loop_flag = 0; //(read_s32be(0x4C,sf) != -1); /* not seen */
start_offset = (channels == 1) ? 0x70 : 0x50;
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channels, loop_flag);
if (!vgmstream) goto fail;
vgmstream->meta_type = meta_STS;
vgmstream->sample_rate = sample_rate;
vgmstream->num_samples = dsp_bytes_to_samples(channel_size, 1);
vgmstream->loop_start_sample = 0;
vgmstream->loop_end_sample = vgmstream->num_samples;
vgmstream->coding_type = coding_NGC_DSP;
vgmstream->layout_type = layout_interleave;
vgmstream->interleave_block_size = channel_size + 0x2e;
dsp_read_coefs_be(vgmstream, sf, 0x1e, start_offset - 0x1e + channel_size);
dsp_read_hist_be(vgmstream, sf, 0x1e + 0x24, start_offset - 0x1e + channel_size);
if (!vgmstream_open_stream(vgmstream, sf, start_offset))
goto fail;
return vgmstream;
fail:
close_vgmstream(vgmstream);
return NULL;
}