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Add TXTH subfile_offset for wrapper files

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bnnm 2019-03-10 23:39:48 +01:00
parent d0bb4d964e
commit f2aa9905d4
1 changed files with 84 additions and 0 deletions
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84
src/meta/txth.c
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@ -85,6 +85,11 @@ typedef struct {
uint32_t name_offset;
uint32_t name_size;
int subfile_set;
uint32_t subfile_offset;
uint32_t subfile_size;
char subfile_extension[32];
/* original STREAMFILE and its type (may be an unsupported "base" file or a .txth) */
STREAMFILE *streamFile;
int streamfile_is_txth;
@ -101,9 +106,11 @@ typedef struct {
static STREAMFILE * open_txth(STREAMFILE * streamFile);
static VGMSTREAM *init_subfile(txth_header * txth);
static int parse_txth(txth_header * txth);
static int parse_keyval(STREAMFILE * streamFile, txth_header * txth, const char * key, char * val);
static int parse_num(STREAMFILE * streamFile, txth_header * txth, const char * val, uint32_t * out_value);
static int parse_string(STREAMFILE * streamFile, txth_header * txth, const char * val, char * str);
static int get_bytes_to_samples(txth_header * txth, uint32_t bytes);
@ -149,6 +156,11 @@ VGMSTREAM * init_vgmstream_txth(STREAMFILE *streamFile) {
if (!parse_txth(&txth))
goto fail;
/* special case of parsing subfiles */
if (txth.subfile_set) {
return init_subfile(&txth);
}
/* type to coding conversion */
switch (txth.codec) {
@ -492,6 +504,55 @@ fail:
return NULL;
}
static VGMSTREAM *init_subfile(txth_header * txth) {
VGMSTREAM *vgmstream = NULL;
char extension[PATH_LIMIT];
STREAMFILE * streamSubfile = NULL;
if (txth->subfile_size == 0)
txth->subfile_size = txth->data_size - txth->subfile_offset;
if (txth->subfile_extension[0] == '\0')
get_streamfile_ext(txth->streamFile,txth->subfile_extension,sizeof(txth->subfile_extension));
/* must detect a potential infinite loop:
* - init_vgmstream enters TXTH and reads .txth
* - TXTH subfile calls init, nothing is detected
* - init_vgmstream enters TXTH and reads .txth
* - etc
* to avoid it we set a particular fake extension and detect it when reading .txth
*/
strcpy(extension, "subfile_txth.");
strcat(extension, txth->subfile_extension);
streamSubfile = setup_subfile_streamfile(txth->streamBody, txth->subfile_offset, txth->subfile_size, extension);
if (!streamSubfile) goto fail;
vgmstream = init_vgmstream_from_STREAMFILE(streamSubfile);
if (!vgmstream) goto fail;
/* apply some fields */
if (txth->sample_rate)
vgmstream->sample_rate = txth->sample_rate;
if (txth->num_samples)
vgmstream->num_samples = txth->num_samples;
if (txth->loop_flag) {
vgmstream_force_loop(vgmstream, txth->loop_flag, txth->loop_start_sample, txth->loop_end_sample);
}
else if (txth->loop_flag_set && vgmstream->loop_flag) {
vgmstream_force_loop(vgmstream, 0, 0, 0);
}
close_streamfile(streamSubfile);
return vgmstream;
fail:
close_streamfile(streamSubfile);
close_vgmstream(vgmstream);
return NULL;
}
static STREAMFILE * open_txth(STREAMFILE * streamFile) {
char basename[PATH_LIMIT];
@ -502,6 +563,8 @@ static STREAMFILE * open_txth(STREAMFILE * streamFile) {
/* try "(path/)(name.ext).txth" */
get_streamfile_name(streamFile,filename,PATH_LIMIT);
if (strstr(filename, "subfile_txth") != NULL)
return NULL; /* detect special case of subfile-within-subfile */
strcat(filename, ".txth");
streamText = open_streamfile(streamFile,filename);
if (streamText) return streamText;
@ -813,6 +876,18 @@ static int parse_keyval(STREAMFILE * streamFile_, txth_header * txth, const char
else if (0==strcmp(key,"name_size")) {
if (!parse_num(txth->streamHead,txth,val, &txth->name_size)) goto fail;
}
else if (0==strcmp(key,"subfile_offset")) {
if (!parse_num(txth->streamHead,txth,val, &txth->subfile_offset)) goto fail;
txth->subfile_set = 1;
}
else if (0==strcmp(key,"subfile_size")) {
if (!parse_num(txth->streamHead,txth,val, &txth->subfile_size)) goto fail;
txth->subfile_set = 1;
}
else if (0==strcmp(key,"subfile_extension")) {
if (!parse_string(txth->streamHead,txth,val, txth->subfile_extension)) goto fail;
txth->subfile_set = 1;
}
else if (0==strcmp(key,"header_file")) {
if (txth->streamhead_opened) {
close_streamfile(txth->streamHead);
@ -888,6 +963,15 @@ static int starts_with(const char * val, const char * cmp) {
return 0;
}
static int parse_string(STREAMFILE * streamFile, txth_header * txth, const char * val, char * str) {
int n = 0;
/* read string without trailing spaces */
if (sscanf(val, " %s%n[^ ]%n", str, &n, &n) != 1)
return 0;
return n;
}
static int parse_num(STREAMFILE * streamFile, txth_header * txth, const char * val, uint32_t * out_value) {
/* out_value can be these, save before modifying */
uint32_t value_mul = txth->value_mul;