static int y4m_parse_frame_tags(char *s, y4m_frame_info_t *i)
{
char *token, *value;
char tag;
int err;
/* parse fields */
for (token = strtok(s, Y4M_DELIM);
token != NULL;
token = strtok(NULL, Y4M_DELIM)) {
if (token[0] == '\0') continue; /* skip empty strings */
tag = token[0];
value = token + 1;
switch (tag) {
case 'X': /* 'X' meta-tag */
if ((err = y4m_xtag_add(&(i->x_tags), token)) != Y4M_OK) return err;
break;
default:
/* possible error on unknown options */
if (_y4mparam_allow_unknown_tags) {
/* unknown tags ok: store in xtag list and warn... */
if ((err = y4m_xtag_add(&(i->x_tags), token)) != Y4M_OK) return err;
mp_msg(MSGT_DEMUX, MSGL_WARN, "Unknown frame tag encountered: '%s'\n", token);
} else {
/* unknown tags are *not* ok */
return Y4M_ERR_BADTAG;
}
break;
}
}
/* ta da! done. */
return Y4M_OK;
}
static int y4m_parse_frame_tags(char *s, const y4m_stream_info_t *si,
y4m_frame_info_t *fi)
{
char *token, *value;
char tag;
int err;
/* parse fields */
for (token = strtok(s, Y4M_DELIM);
token != NULL;
token = strtok(NULL, Y4M_DELIM)) {
if (token[0] == '\0') continue; /* skip empty strings */
tag = token[0];
value = token + 1;
switch (tag) {
case 'I':
/* frame 'I' tag requires feature level >= 1 */
if (_y4mparam_feature_level < 1) return Y4M_ERR_FEATURE;
if (si->interlace != Y4M_ILACE_MIXED) return Y4M_ERR_BADTAG;
switch (value[0]) {
case 't': fi->presentation = Y4M_PRESENT_TOP_FIRST; break;
case 'T': fi->presentation = Y4M_PRESENT_TOP_FIRST_RPT; break;
case 'b': fi->presentation = Y4M_PRESENT_BOTTOM_FIRST; break;
case 'B': fi->presentation = Y4M_PRESENT_BOTTOM_FIRST_RPT; break;
case '1': fi->presentation = Y4M_PRESENT_PROG_SINGLE; break;
case '2': fi->presentation = Y4M_PRESENT_PROG_DOUBLE; break;
case '3': fi->presentation = Y4M_PRESENT_PROG_TRIPLE; break;
default:
return Y4M_ERR_BADTAG;
}
switch (value[1]) {
case 'p': fi->temporal = Y4M_SAMPLING_PROGRESSIVE; break;
case 'i': fi->temporal = Y4M_SAMPLING_INTERLACED; break;
default:
return Y4M_ERR_BADTAG;
}
switch (value[2]) {
case 'p': fi->spatial = Y4M_SAMPLING_PROGRESSIVE; break;
case 'i': fi->spatial = Y4M_SAMPLING_INTERLACED; break;
case '?': fi->spatial = Y4M_UNKNOWN; break;
default:
return Y4M_ERR_BADTAG;
}
break;
case 'X': /* 'X' meta-tag */
if ((err = y4m_xtag_add(&(fi->x_tags), token)) != Y4M_OK) return err;
break;
default:
/* possible error on unknown options */
if (_y4mparam_allow_unknown_tags) {
/* unknown tags ok: store in xtag list and warn... */
if ((err = y4m_xtag_add(&(fi->x_tags), token)) != Y4M_OK) return err;
mjpeg_warn("Unknown frame tag encountered: '%s'", token);
} else {
/* unknown tags are *not* ok */
return Y4M_ERR_BADTAG;
}
break;
}
}
/* error-checking and/or non-mixed defaults */
switch (si->interlace) {
case Y4M_ILACE_MIXED:
/* T and P are required if stream "Im" */
if ((fi->presentation == Y4M_UNKNOWN) || (fi->temporal == Y4M_UNKNOWN))
return Y4M_ERR_HEADER;
/* and S is required if stream is also 4:2:0 */
if ( ((si->chroma == Y4M_CHROMA_420JPEG) ||
(si->chroma == Y4M_CHROMA_420MPEG2) ||
(si->chroma == Y4M_CHROMA_420PALDV)) &&
(fi->spatial == Y4M_UNKNOWN) )
return Y4M_ERR_HEADER;
break;
case Y4M_ILACE_NONE:
/* stream "Ip" --> equivalent to frame "I1pp" */
fi->spatial = Y4M_SAMPLING_PROGRESSIVE;
fi->temporal = Y4M_SAMPLING_PROGRESSIVE;
fi->presentation = Y4M_PRESENT_PROG_SINGLE;
break;
case Y4M_ILACE_TOP_FIRST:
/* stream "It" --> equivalent to frame "Itii" */
fi->spatial = Y4M_SAMPLING_INTERLACED;
fi->temporal = Y4M_SAMPLING_INTERLACED;
fi->presentation = Y4M_PRESENT_TOP_FIRST;
break;
case Y4M_ILACE_BOTTOM_FIRST:
/* stream "Ib" --> equivalent to frame "Ibii" */
fi->spatial = Y4M_SAMPLING_INTERLACED;
fi->temporal = Y4M_SAMPLING_INTERLACED;
fi->presentation = Y4M_PRESENT_BOTTOM_FIRST;
break;
default:
/* stream unknown: then, whatever */
break;
}
/* ta da! done. */
return Y4M_OK;
}
int y4m_parse_stream_tags(char *s, y4m_stream_info_t *i)
{
char *token, *value;
char tag;
int err;
/* parse fields */
for (token = strtok(s, Y4M_DELIM);
token != NULL;
token = strtok(NULL, Y4M_DELIM)) {
if (token[0] == '\0') continue; /* skip empty strings */
tag = token[0];
value = token + 1;
switch (tag) {
case 'W': /* width */
i->width = atoi(value);
if (i->width <= 0) return Y4M_ERR_RANGE;
break;
case 'H': /* height */
i->height = atoi(value);
if (i->height <= 0) return Y4M_ERR_RANGE;
break;
case 'F': /* frame rate (fps) */
if ((err = y4m_parse_ratio(&(i->framerate), value)) != Y4M_OK)
return err;
if (i->framerate.n < 0) return Y4M_ERR_RANGE;
break;
case 'I': /* interlacing */
switch (value[0]) {
case 'p': i->interlace = Y4M_ILACE_NONE; break;
case 't': i->interlace = Y4M_ILACE_TOP_FIRST; break;
case 'b': i->interlace = Y4M_ILACE_BOTTOM_FIRST; break;
case '?':
default:
i->interlace = Y4M_UNKNOWN; break;
}
break;
case 'A': /* sample (pixel) aspect ratio */
if ((err = y4m_parse_ratio(&(i->sampleaspect), value)) != Y4M_OK)
return err;
if (i->sampleaspect.n < 0) return Y4M_ERR_RANGE;
break;
case 'X': /* 'X' meta-tag */
if ((err = y4m_xtag_add(&(i->x_tags), token)) != Y4M_OK) return err;
break;
default:
/* possible error on unknown options */
if (_y4mparam_allow_unknown_tags) {
/* unknown tags ok: store in xtag list and warn... */
if ((err = y4m_xtag_add(&(i->x_tags), token)) != Y4M_OK) return err;
mp_msg(MSGT_DEMUX, MSGL_WARN, "Unknown stream tag encountered: '%s'\n", token);
} else {
/* unknown tags are *not* ok */
return Y4M_ERR_BADTAG;
}
break;
}
}
/* Error checking... width and height must be known since we can't
* parse without them
*/
if( i->width == Y4M_UNKNOWN || i->height == Y4M_UNKNOWN )
return Y4M_ERR_HEADER;
/* ta da! done. */
return Y4M_OK;
}
int y4m_parse_stream_tags(char *s, y4m_stream_info_t *i)
{
char *token, *value;
char tag;
int err;
/* parse fields */
for (token = strtok(s, Y4M_DELIM);
token != NULL;
token = strtok(NULL, Y4M_DELIM)) {
if (token[0] == '\0') continue; /* skip empty strings */
tag = token[0];
value = token + 1;
switch (tag) {
case 'W': /* width */
i->width = atoi(value);
if (i->width <= 0) return Y4M_ERR_RANGE;
break;
case 'H': /* height */
i->height = atoi(value);
if (i->height <= 0) return Y4M_ERR_RANGE;
break;
case 'F': /* frame rate (fps) */
if ((err = y4m_parse_ratio(&(i->framerate), value)) != Y4M_OK)
return err;
if (i->framerate.n < 0) return Y4M_ERR_RANGE;
break;
case 'I': /* interlacing */
switch (value[0]) {
case 'p': i->interlace = Y4M_ILACE_NONE; break;
case 't': i->interlace = Y4M_ILACE_TOP_FIRST; break;
case 'b': i->interlace = Y4M_ILACE_BOTTOM_FIRST; break;
case 'm': i->interlace = Y4M_ILACE_MIXED; break;
case '?':
default:
i->interlace = Y4M_UNKNOWN; break;
}
break;
case 'A': /* sample (pixel) aspect ratio */
if ((err = y4m_parse_ratio(&(i->sampleaspect), value)) != Y4M_OK)
return err;
if (i->sampleaspect.n < 0) return Y4M_ERR_RANGE;
break;
case 'C':
i->chroma = y4m_chroma_parse_keyword(value);
if (i->chroma == Y4M_UNKNOWN)
return Y4M_ERR_HEADER;
break;
case 'X': /* 'X' meta-tag */
if ((err = y4m_xtag_add(&(i->x_tags), token)) != Y4M_OK) return err;
break;
default:
/* possible error on unknown options */
if (_y4mparam_allow_unknown_tags) {
/* unknown tags ok: store in xtag list and warn... */
if ((err = y4m_xtag_add(&(i->x_tags), token)) != Y4M_OK) return err;
mjpeg_warn("Unknown stream tag encountered: '%s'", token);
} else {
/* unknown tags are *not* ok */
return Y4M_ERR_BADTAG;
}
break;
}
}
/* Without 'C' tag or any other chroma spec, default to 420jpeg */
if (i->chroma == Y4M_UNKNOWN)
i->chroma = Y4M_CHROMA_420JPEG;
/* Error checking... */
/* - Width and Height are required. */
if ((i->width == Y4M_UNKNOWN) || (i->height == Y4M_UNKNOWN))
return Y4M_ERR_HEADER;
/* - Non-420 chroma and mixed interlace require level >= 1 */
if (_y4mparam_feature_level < 1) {
if ((i->chroma != Y4M_CHROMA_420JPEG) &&
(i->chroma != Y4M_CHROMA_420MPEG2) &&
(i->chroma != Y4M_CHROMA_420PALDV))
return Y4M_ERR_FEATURE;
if (i->interlace == Y4M_ILACE_MIXED)
return Y4M_ERR_FEATURE;
}
/* ta da! done. */
return Y4M_OK;
}
