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chd_stream: support PRIMARY special track

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This commit is contained in:
Brian Koropoff 2017-09-17 14:20:32 -07:00
parent edf90d250f
commit 5b20c13f92
2 changed files with 65 additions and 15 deletions
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4
libretro-common/include/streams/chd_stream.h
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@ -32,8 +32,12 @@ RETRO_BEGIN_DECLS
typedef struct chdstream chdstream_t;
// First data track
#define CHDSTREAM_TRACK_FIRST_DATA (-1)
// Last track
#define CHDSTREAM_TRACK_LAST (-2)
// Primary (largest) data track, used for CRC identification purposes
#define CHDSTREAM_TRACK_PRIMARY (-3)
chdstream_t *chdstream_open(const char *path, int32_t track);

76
libretro-common/streams/chd_stream.c
View File

@ -82,10 +82,12 @@ chdstream_get_meta(chd_file *chd, int idx, metadata_t *md)
{
char meta[256];
uint32_t meta_size = 0;
chd_error err = chd_get_metadata(
chd, CDROM_TRACK_METADATA2_TAG, idx, meta,
sizeof(meta), &meta_size, NULL, NULL);
chd_error err;
memset(md, 0, sizeof(*md));
err = chd_get_metadata(chd, CDROM_TRACK_METADATA2_TAG, idx, meta,
sizeof(meta), &meta_size, NULL, NULL);
if (err == CHDERR_NONE)
{
sscanf(meta, CDROM_TRACK_METADATA2_FORMAT,
@ -111,40 +113,84 @@ chdstream_get_meta(chd_file *chd, int idx, metadata_t *md)
}
static bool
chdstream_find_track(chd_file *fd, int32_t track, metadata_t *meta)
chdstream_find_track_number(chd_file *fd, int32_t track, metadata_t *meta)
{
uint32_t i;
memset(meta, 0, sizeof(*meta));
uint32_t frame_offset = 0;
for (i = 0; true; ++i)
{
if (!chdstream_get_meta(fd, i, meta))
{
if (track != CHDSTREAM_TRACK_LAST)
return false;
return false;
}
meta->frame_offset -= meta->frames + meta->extra;
if (track == meta->track)
{
meta->frame_offset = frame_offset;
return true;
}
if ((track == CHDSTREAM_TRACK_FIRST_DATA &&
strcmp(meta->type, "AUDIO")) ||
(track > 0 && track == meta->track))
return true;
frame_offset += meta->frames + meta->extra;
}
}
meta->frame_offset += meta->frames + meta->extra;
static bool
chdstream_find_special_track(chd_file *fd, int32_t track, metadata_t *meta)
{
int32_t i;
metadata_t iter;
int32_t largest_track = 0;
uint32_t largest_size = 0;
for (i = 1; true; ++i)
{
if (!chdstream_find_track_number(fd, i, &iter)) {
if (track == CHDSTREAM_TRACK_LAST && i > 1) {
*meta = iter;
return true;
} else if (track == CHDSTREAM_TRACK_PRIMARY && largest_track != 0) {
return chdstream_find_track_number(fd, largest_track, meta);
}
}
switch (track) {
case CHDSTREAM_TRACK_FIRST_DATA:
if (strcmp(iter.type, "AUDIO")) {
*meta = iter;
return true;
}
break;
case CHDSTREAM_TRACK_PRIMARY:
if (strcmp(iter.type, "AUDIO") && iter.frames > largest_size) {
largest_size = iter.frames;
largest_track = iter.track;
}
break;
default:
break;
}
}
}
static bool
chdstream_find_track(chd_file *fd, int32_t track, metadata_t *meta)
{
if (track < 0) {
return chdstream_find_special_track(fd, track, meta);
} else {
return chdstream_find_track_number(fd, track, meta);
}
}
chdstream_t *chdstream_open(const char *path, int32_t track)
{
metadata_t meta;
uint32_t pregap = 0;
const chd_header *hd = NULL;
chdstream_t *stream = NULL;
chd_file *chd = NULL;
chd_error err = chd_open(path, CHD_OPEN_READ, NULL, &chd);
metadata_t meta;
if (err != CHDERR_NONE)
goto error;