136 lines
4.7 KiB
C
136 lines
4.7 KiB
C
#ifndef _MTA2_STREAMFILE_H_
|
|
#define _MTA2_STREAMFILE_H_
|
|
#include "../streamfile.h"
|
|
|
|
typedef struct {
|
|
/* config */
|
|
int big_endian;
|
|
uint32_t target_type;
|
|
off_t stream_offset;
|
|
size_t stream_size;
|
|
|
|
/* state */
|
|
off_t logical_offset; /* fake offset */
|
|
off_t physical_offset; /* actual offset */
|
|
size_t block_size; /* current size */
|
|
size_t skip_size; /* size from block start to reach data */
|
|
size_t data_size; /* usable size in a block */
|
|
|
|
size_t logical_size;
|
|
} mta2_io_data;
|
|
|
|
|
|
static size_t mta2_io_read(STREAMFILE *sf, uint8_t *dest, off_t offset, size_t length, mta2_io_data* data) {
|
|
size_t total_read = 0;
|
|
uint32_t (*read_u32)(off_t,STREAMFILE*) = data->big_endian ? read_u32be : read_u32le;
|
|
|
|
|
|
/* re-start when previous offset (can't map logical<>physical offsets) */
|
|
if (data->logical_offset < 0 || offset < data->logical_offset) {
|
|
;VGM_LOG("IO restart: offset=%lx + %x, po=%lx, lo=%lx\n", offset, length, data->physical_offset, data->logical_offset);
|
|
data->physical_offset = data->stream_offset;
|
|
data->logical_offset = 0x00;
|
|
data->data_size = 0;
|
|
}
|
|
|
|
/* read blocks */
|
|
while (length > 0) {
|
|
|
|
/* ignore EOF */
|
|
if (offset < 0 || data->physical_offset >= data->stream_offset + data->stream_size) {
|
|
break;
|
|
}
|
|
|
|
/* process new block */
|
|
if (data->data_size == 0) {
|
|
uint32_t block_type, block_size, block_track;
|
|
|
|
block_type = read_u32(data->physical_offset+0x00, sf); /* subtype and type */
|
|
block_size = read_u32(data->physical_offset+0x04, sf);
|
|
//block_unk = read_u32(data->physical_offset+0x08, streamfile); /* usually 0 except for 0xF0 'end' block */
|
|
block_track = read_u32(data->physical_offset+0x0c, sf);
|
|
|
|
if (block_type != data->target_type || block_size == 0xFFFFFFFF)
|
|
break;
|
|
|
|
data->block_size = block_size;
|
|
data->skip_size = 0x10;
|
|
data->data_size = block_size - data->skip_size;
|
|
/* no audio data (padding block), but write first (header) */
|
|
if (block_track == 0 && data->logical_offset > 0)
|
|
data->data_size = 0;
|
|
}
|
|
|
|
/* move to next block */
|
|
if (data->data_size == 0 || offset >= data->logical_offset + data->data_size) {
|
|
data->physical_offset += data->block_size;
|
|
data->logical_offset += data->data_size;
|
|
data->data_size = 0;
|
|
continue;
|
|
}
|
|
|
|
/* read data */
|
|
{
|
|
size_t bytes_consumed, bytes_done, to_read;
|
|
|
|
bytes_consumed = offset - data->logical_offset;
|
|
to_read = data->data_size - bytes_consumed;
|
|
if (to_read > length)
|
|
to_read = length;
|
|
bytes_done = read_streamfile(dest, data->physical_offset + data->skip_size + bytes_consumed, to_read, sf);
|
|
|
|
total_read += bytes_done;
|
|
dest += bytes_done;
|
|
offset += bytes_done;
|
|
length -= bytes_done;
|
|
|
|
if (bytes_done != to_read || bytes_done == 0) {
|
|
break; /* error/EOF */
|
|
}
|
|
}
|
|
}
|
|
|
|
return total_read;
|
|
}
|
|
|
|
static size_t mta2_io_size(STREAMFILE *streamfile, mta2_io_data* data) {
|
|
uint8_t buf[1];
|
|
|
|
if (data->logical_size > 0)
|
|
return data->logical_size;
|
|
|
|
/* force a fake read at max offset, to get max logical_offset (will be reset next read) */
|
|
mta2_io_read(streamfile, buf, 0x7FFFFFFF, 1, data);
|
|
data->logical_size = data->logical_offset;
|
|
|
|
return data->logical_size;
|
|
}
|
|
|
|
/* Handles removing KCE Japan-style blocks in MTA2 streams
|
|
* (these blocks exist in most KCEJ games and aren't actually related to audio) */
|
|
static STREAMFILE* setup_mta2_streamfile(STREAMFILE *sf, off_t stream_offset, int big_endian, const char *extension) {
|
|
STREAMFILE *new_sf = NULL;
|
|
mta2_io_data io_data = {0};
|
|
uint32_t (*read_u32)(off_t,STREAMFILE*) = big_endian ? read_u32be : read_u32le;
|
|
|
|
|
|
/* blocks must start with a 'new sub-stream' id */
|
|
if (read_u32(stream_offset+0x00, sf) != 0x00000010)
|
|
return NULL;
|
|
|
|
io_data.target_type = read_u32(stream_offset + 0x0c, sf);
|
|
io_data.stream_offset = stream_offset + 0x10;
|
|
io_data.stream_size = get_streamfile_size(sf) - io_data.stream_offset;
|
|
io_data.big_endian = big_endian;
|
|
io_data.logical_offset = -1; /* force phys offset reset */
|
|
|
|
/* setup subfile */
|
|
new_sf = open_wrap_streamfile(sf);
|
|
new_sf = open_io_streamfile_f(new_sf, &io_data, sizeof(mta2_io_data), mta2_io_read, mta2_io_size);
|
|
if (extension)
|
|
new_sf = open_fakename_streamfile_f(new_sf, NULL, extension);
|
|
return new_sf;
|
|
}
|
|
|
|
#endif /* _MTA2_STREAMFILE_H_ */
|