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Improve Ubi BAO (.pk) parsing speed

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This commit is contained in:
bnnm 2019-01-01 23:21:08 +01:00
parent 18fcb5fed7
commit 9e1e4464b0
3 changed files with 41 additions and 10 deletions
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38
src/meta/ubi_bao.c
View File

@ -265,6 +265,8 @@ static int parse_pk_header(ubi_bao_header * bao, STREAMFILE *streamFile) {
size_t index_size, index_header_size;
off_t bao_offset, resources_offset;
int target_subsong = streamFile->stream_index;
uint8_t *index_buffer = NULL;
STREAMFILE *streamTest = NULL;
/* class: 0x01=index, 0x02=BAO */
@ -273,7 +275,7 @@ static int parse_pk_header(ubi_bao_header * bao, STREAMFILE *streamFile) {
/* index and resources always LE */
/* 0x01(3): version, major/minor/release (numbering continues from .sb0/sm0) */
index_size = read_32bitLE(0x04, streamFile); /* can be 0 */
index_size = read_32bitLE(0x04, streamFile); /* can be 0, not including */
resources_offset = read_32bitLE(0x08, streamFile); /* always found even if not used */
/* 0x0c: always 0? */
/* 0x10: unknown, null if no entries */
@ -287,14 +289,26 @@ static int parse_pk_header(ubi_bao_header * bao, STREAMFILE *streamFile) {
index_entries = index_size / 0x08;
index_header_size = 0x40;
/* parse index to get target subsong N = Nth header BAO */
/* pre-load to avoid too much I/O back and forth */
if (index_size > (10000*0x08)) {
VGM_LOG("BAO: index too big\n");
goto fail;
}
index_buffer = malloc(index_size);
read_streamfile(index_buffer, index_header_size, index_size, streamFile);
/* use smaller I/O buffer for performance, as this read lots of small BAO headers all over the place */
streamTest = reopen_streamfile(streamFile, 0x100);
if (!streamTest) goto fail;
/* parse index to get target subsong N = Nth audio header BAO */
bao_offset = index_header_size + index_size;
for (i = 0; i < index_entries; i++) {
//uint32_t bao_id = read_32bitLE(index_header_size+0x08*i+0x00, streamFile);
size_t bao_size = read_32bitLE(index_header_size+0x08*i+0x04, streamFile);
//uint32_t bao_id = get_32bitLE(index_buffer + 0x08*i+ 0x00);
size_t bao_size = get_32bitLE(index_buffer + 0x08*i + 0x04);
/* parse and continue to find out total_subsongs */
if (!parse_bao(bao, streamFile, bao_offset))
if (!parse_bao(bao, streamTest, bao_offset))
goto fail;
bao_offset += bao_size; /* files simply concat BAOs */
@ -393,8 +407,12 @@ static int parse_pk_header(ubi_bao_header * bao, STREAMFILE *streamFile) {
;VGM_LOG("BAO stream: id=%x, offset=%x, size=%x, res=%s\n", bao->stream_id, (uint32_t)bao->stream_offset, bao->stream_size, (bao->is_external ? bao->resource_name : "internal"));
free(index_buffer);
close_streamfile(streamTest);
return 1;
fail:
free(index_buffer);
close_streamfile(streamTest);
return 0;
}
@ -407,14 +425,14 @@ static int parse_bao(ubi_bao_header * bao, STREAMFILE *streamFile, off_t offset)
/* 0x00(1): class? usually 0x02 but older BAOs have 0x01 too */
bao_version = read_32bitBE(offset + 0x00, streamFile) & 0x00FFFFFF;
bao_version = read_32bitBE(offset+0x00, streamFile) & 0x00FFFFFF;
/* detect endianness */
if (read_32bitLE(offset+0x04, streamFile) < 0x0000FFFF) {
read_32bit = read_32bitLE;
} else {
/* this could be done once as all BAOs share endianness */
if (guess_endianness32bit(offset+0x04, streamFile)) {
read_32bit = read_32bitBE;
bao->big_endian = 1;
} else {
read_32bit = read_32bitLE;
}
header_size = read_32bit(offset+0x04, streamFile); /* mainly 0x28, rarely 0x24 */

9
src/streamfile.c
View File

@ -800,6 +800,15 @@ STREAMFILE * open_streamfile_by_filename(STREAMFILE *streamFile, const char * na
return streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
}
STREAMFILE * reopen_streamfile(STREAMFILE *streamFile, size_t buffer_size) {
char pathname[PATH_LIMIT];
if (buffer_size == 0)
buffer_size = STREAMFILE_DEFAULT_BUFFER_SIZE;
streamFile->get_name(streamFile,pathname,sizeof(pathname));
return streamFile->open(streamFile,pathname,buffer_size);
}
/* Read a line into dst. The source files are lines separated by CRLF (Windows) / LF (Unux) / CR (Mac).
* The line will be null-terminated and CR/LF removed if found.

4
src/streamfile.h
View File

@ -123,6 +123,10 @@ STREAMFILE * open_streamfile_by_ext(STREAMFILE *streamFile, const char * ext);
* Can be used to get companion files. */
STREAMFILE * open_streamfile_by_filename(STREAMFILE *streamFile, const char * filename);
/* Reopen a STREAMFILE with a different buffer size, for fine-tuned bigfile parsing.
* Uses default buffer size when buffer_size is 0 */
STREAMFILE * reopen_streamfile(STREAMFILE *streamFile, size_t buffer_size);
/* close a file, destroy the STREAMFILE object */
static inline void close_streamfile(STREAMFILE * streamfile) {