static void *open_chd(const char *filename, movie_info *info)
{
int fps, fpsfrac, width, height, interlaced, channels, rate;
char metadata[256];
chd_error chderr;
chd_file *chd;
/* open the file */
chderr = chd_open(filename, CHD_OPEN_READ, NULL, &chd);
if (chderr != CHDERR_NONE)
{
fprintf(stderr, "Error opening CHD file: %s\n", chd_error_string(chderr));
return NULL;
}
/* get the metadata */
chderr = chd_get_metadata(chd, AV_METADATA_TAG, 0, metadata, sizeof(metadata), NULL, NULL, NULL);
if (chderr != CHDERR_NONE)
{
fprintf(stderr, "Error getting A/V metadata: %s\n", chd_error_string(chderr));
chd_close(chd);
return NULL;
}
/* extract the info */
if (sscanf(metadata, AV_METADATA_FORMAT, &fps, &fpsfrac, &width, &height, &interlaced, &channels, &rate) != 7)
{
fprintf(stderr, "Improperly formatted metadata\n");
chd_close(chd);
return NULL;
}
/* extract movie info */
info->framerate = (fps * 1000000 + fpsfrac) / 1000000.0;
info->numframes = chd_get_header(chd)->totalhunks;
info->width = width;
info->height = height;
info->samplerate = rate;
info->channels = channels;
/* convert to an interlaced frame */
chdinterlaced = interlaced;
if (interlaced)
{
info->framerate /= 2;
info->numframes = (info->numframes + 1) / 2;
info->height *= 2;
}
return chd;
}
cdrom_file *cdrom_open(const char *inputfile)
{
int i;
cdrom_file *file;
UINT32 physofs;
/* allocate memory for the CD-ROM file */
file = (cdrom_file *)malloc(sizeof(cdrom_file));
if (file == NULL)
return NULL;
/* setup the CDROM module and get the disc info */
chd_error err = chdcd_parse_toc(inputfile, &file->cdtoc, &file->track_info);
if (err != CHDERR_NONE)
{
fprintf(stderr, "Error reading input file: %s\n", chd_error_string(err));
return NULL;
}
/* fill in the data */
file->chd = NULL;
file->hunksectors = 1;
file->cachehunk = -1;
LOG(("CD has %d tracks\n", file->cdtoc.numtrks));
for (i = 0; i < file->cdtoc.numtrks; i++)
{
file_error filerr = core_fopen(file->track_info.fname[i], OPEN_FLAG_READ, &file->fhandle[i]);
if (filerr != FILERR_NONE)
{
fprintf(stderr, "Unable to open file: %s\n", file->track_info.fname[i]);
return NULL;
}
}
/* calculate the starting frame for each track, keeping in mind that CHDMAN
pads tracks out with extra frames to fit hunk size boundries
*/
physofs = 0;
for (i = 0; i < file->cdtoc.numtrks; i++)
{
file->cdtoc.tracks[i].physframeofs = physofs;
file->cdtoc.tracks[i].chdframeofs = 0;
physofs += file->cdtoc.tracks[i].frames;
LOG(("Track %02d is format %d subtype %d datasize %d subsize %d frames %d extraframes %d physofs %d chdofs %d\n", i+1,
file->cdtoc.tracks[i].trktype,
file->cdtoc.tracks[i].subtype,
file->cdtoc.tracks[i].datasize,
file->cdtoc.tracks[i].subsize,
file->cdtoc.tracks[i].frames,
file->cdtoc.tracks[i].extraframes,
file->cdtoc.tracks[i].physframeofs,
file->cdtoc.tracks[i].chdframeofs));
}
/* fill out dummy entries for the last track to help our search */
file->cdtoc.tracks[i].physframeofs = physofs;
file->cdtoc.tracks[i].chdframeofs = 0;
/* allocate a cache */
file->cache = (UINT8 *)malloc(CD_FRAME_SIZE);
if (file->cache == NULL)
{
free(file);
return NULL;
}
return file;
}