mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-29 23:03:04 +01:00
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
#include "meta.h"
|
|
#include "../util.h"
|
|
|
|
|
|
/* SWAV - wave files generated by the DS SDK */
|
|
VGMSTREAM* init_vgmstream_swav(STREAMFILE* sf) {
|
|
VGMSTREAM* vgmstream = NULL;
|
|
uint32_t start_offset, data_size, file_size;
|
|
int channels, loop_flag, codec, bits_per_sample, sample_rate;
|
|
int32_t loop_start, loop_end;
|
|
coding_t coding_type;
|
|
|
|
|
|
|
|
/* checks */
|
|
if (!is_id32be(0x00,sf, "SWAV"))
|
|
goto fail;
|
|
|
|
/* .swav: standard [found inside .sdat but SDK can create them]
|
|
* .adpcm: Merlin - A Servant of Two Masters (DS) [external] */
|
|
if (!check_extensions(sf, "swav,adpcm"))
|
|
goto fail;
|
|
|
|
/* 0x04: BOM mark */
|
|
/* 0x06: version? (1.00) */
|
|
file_size = read_u32le(0x08,sf);
|
|
/* 0x0c: always 16? */
|
|
/* 0x0e: always 1? */
|
|
|
|
if (!is_id32be(0x10,sf, "DATA"))
|
|
goto fail;
|
|
data_size = read_u32le(0x14,sf);
|
|
codec = read_u8(0x18,sf);
|
|
loop_flag = read_u8(0x19,sf);
|
|
sample_rate = read_u16le(0x1A,sf);
|
|
/* 0x1c: related to size? */
|
|
loop_start = read_u16le(0x1E,sf);
|
|
loop_end = read_s32le(0x20,sf);
|
|
|
|
start_offset = 0x24;
|
|
|
|
/* strange values found in Face Training (DSi) samples, may be pitch/etc reference info? (samples sounds ok like this) */
|
|
if (sample_rate < 0x2000)
|
|
sample_rate = 44100;
|
|
|
|
channels = 1;
|
|
if (get_streamfile_size(sf) != file_size) {
|
|
if (get_streamfile_size(sf) != (file_size - 0x24) * 2 + 0x24)
|
|
goto fail;
|
|
channels = 2;
|
|
}
|
|
|
|
switch (codec) {
|
|
case 0:
|
|
coding_type = coding_PCM8;
|
|
bits_per_sample = 8;
|
|
break;
|
|
case 1:
|
|
coding_type = coding_PCM16LE;
|
|
bits_per_sample = 16;
|
|
break;
|
|
case 2:
|
|
coding_type = coding_IMA_int;
|
|
bits_per_sample = 4;
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
|
|
|
|
/* build the VGMSTREAM */
|
|
vgmstream = allocate_vgmstream(channels, loop_flag);
|
|
if (!vgmstream) goto fail;
|
|
|
|
vgmstream->num_samples = (data_size - 0x14) * 8 / bits_per_sample;
|
|
vgmstream->sample_rate = sample_rate;
|
|
if (loop_flag) {
|
|
vgmstream->loop_start_sample = loop_start * 32 / bits_per_sample;
|
|
vgmstream->loop_end_sample = loop_end * 32 / bits_per_sample + vgmstream->loop_start_sample;
|
|
}
|
|
|
|
if (coding_type == coding_IMA_int) {
|
|
/* handle IMA frame header */
|
|
vgmstream->loop_start_sample -= 32 / bits_per_sample;
|
|
vgmstream->loop_end_sample -= 32 / bits_per_sample;
|
|
vgmstream->num_samples -= 32 / bits_per_sample;
|
|
|
|
{
|
|
int i;
|
|
for (i = 0; i < channels; i++) {
|
|
vgmstream->ch[i].adpcm_history1_32 = read_s16le(start_offset + 0 + 4*i, sf);
|
|
vgmstream->ch[i].adpcm_step_index = read_s16le(start_offset + 2 + 4*i, sf);
|
|
}
|
|
}
|
|
|
|
start_offset += 4 * channels;
|
|
}
|
|
|
|
vgmstream->coding_type = coding_type;
|
|
vgmstream->meta_type = meta_SWAV;
|
|
if (channels == 2) {
|
|
vgmstream->layout_type = layout_interleave;
|
|
vgmstream->interleave_block_size = 1;
|
|
} else {
|
|
vgmstream->layout_type = layout_none;
|
|
}
|
|
|
|
if (!vgmstream_open_stream(vgmstream, sf, start_offset))
|
|
goto fail;
|
|
return vgmstream;
|
|
|
|
fail:
|
|
close_vgmstream(vgmstream);
|
|
return NULL;
|
|
}
|