mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-23 20:04:50 +01:00
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
#ifndef _MUPS_STREAMFILE_H_
|
|
#define _MUPS_STREAMFILE_H_
|
|
#include "deblock_streamfile.h"
|
|
|
|
static inline int32_t max32(int32_t val1, int32_t val2) {
|
|
if (val1 > val2)
|
|
return val2;
|
|
return val1;
|
|
}
|
|
|
|
static void read_callback(uint8_t* dst, deblock_io_data* data, size_t block_pos, size_t read_size) {
|
|
static const uint8_t oggs[] = { 0x4F, 0x67, 0x67, 0x53 };
|
|
static const uint8_t vorbis[] = { 0x76, 0x6F, 0x72, 0x62, 0x69, 0x73 };
|
|
int i, min, max;
|
|
|
|
/* Swaps Xiph magic words back (resulting page checksum is ok).
|
|
* Reads can start/end anywhere, but block_pos = 0 is always page start */
|
|
|
|
/* change "PssH" back to "OggS" */
|
|
if (block_pos < 0x04) {
|
|
min = block_pos;
|
|
if (min < 0x00)
|
|
min = 0x00;
|
|
|
|
max = block_pos + read_size;
|
|
if (max > 0x04)
|
|
max = 0x04;
|
|
|
|
for (i = min; i < max; i++) {
|
|
dst[i] = oggs[i - 0x00];
|
|
}
|
|
}
|
|
|
|
/* first page also needs "psolar" to "vorbis" */
|
|
if (data->logical_offset == 0 && block_pos < 0x23) {
|
|
min = block_pos;
|
|
if (min < 0x1d)
|
|
min = 0x1d;
|
|
|
|
max = block_pos + read_size;
|
|
if (max > 0x23)
|
|
max = 0x23;
|
|
|
|
for (i = min; i < max; i++) {
|
|
dst[i] = vorbis[i - 0x1d];
|
|
}
|
|
}
|
|
}
|
|
|
|
static int get_page_size(STREAMFILE* sf, off_t page_offset) {
|
|
static const int base_size = 0x1b;
|
|
uint8_t page[0x1b + 0x100];
|
|
uint8_t segments;
|
|
size_t page_size;
|
|
int i, bytes;
|
|
|
|
bytes = read_streamfile(page + 0x00, page_offset + 0x00, base_size, sf);
|
|
if (bytes != base_size) goto fail;
|
|
|
|
if (get_u32be(page + 0x00) != 0x50737348) /* "PssH" */
|
|
goto fail;
|
|
|
|
segments = get_u8(page + 0x1a);
|
|
|
|
bytes = read_streamfile(page + base_size, page_offset + base_size, segments, sf);
|
|
if (bytes != segments) goto fail;
|
|
|
|
page_size = base_size + segments;
|
|
for (i = 0; i < segments; i++) {
|
|
uint8_t segment_size = get_u8(page + base_size + i);
|
|
page_size += segment_size;
|
|
}
|
|
|
|
return page_size;
|
|
fail:
|
|
return -1; /* not a valid page */
|
|
}
|
|
|
|
static void block_callback(STREAMFILE* sf, deblock_io_data* data) {
|
|
off_t page_offset = data->physical_offset;
|
|
|
|
/* block size = OggS page size as we need read_callback called on page starts */
|
|
data->data_size = get_page_size(sf, page_offset);
|
|
data->block_size = data->data_size;
|
|
}
|
|
|
|
/* Fixes MUPS streams that contain mutated OggS */
|
|
static STREAMFILE* setup_mups_streamfile(STREAMFILE* sf, off_t stream_offset) {
|
|
STREAMFILE* new_sf = NULL;
|
|
deblock_config_t cfg = {0};
|
|
|
|
cfg.stream_start = stream_offset;
|
|
cfg.block_callback = block_callback;
|
|
cfg.read_callback = read_callback;
|
|
|
|
new_sf = open_wrap_streamfile(sf);
|
|
new_sf = open_io_deblock_streamfile_f(new_sf, &cfg);
|
|
new_sf = open_fakename_streamfile_f(new_sf, NULL, "ogg");
|
|
return new_sf;
|
|
}
|
|
|
|
#endif /* _MUPS_STREAMFILE_H_ */
|