Implement av_set_options_string().

Originally committed as revision 18832 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/parseutils.h

@@ -25,6 +25,8 @@
 #ifndef AVFILTER_PARSEUTILS_H
 #define AVFILTER_PARSEUTILS_H
 
+#include "libavcodec/opt.h"
+
 /**
  * Unescapes the given string until a non escaped terminating char,
  * and returns the token corresponding to the unescaped string.
@@ -51,4 +53,23 @@ char *av_get_token(const char **buf, const char *term);
  */
 int av_parse_color(uint8_t *rgba_color, const char *color_string, void *log_ctx);
 
+/**
+ * Parses the key/value pairs list in opts. For each key/value pair
+ * found, stores the value in the field in ctx that is named like the
+ * key. ctx must be an AVClass context, storing is done using
+ * AVOptions.
+ *
+ * @param key_val_sep a 0-terminated list of characters used to
+ * separate key from value
+ * @param pairs_sep a 0-terminated list of characters used to separate
+ * two pairs from each other
+ * @return the number of successfully set key/value pairs, or a negative
+ * value corresponding to an AVERROR code in case of error:
+ * AVERROR(EINVAL) if opts cannot be parsed,
+ * the error code issued by av_set_string3() if a key/value pair
+ * cannot be set
+ */
+int av_set_options_string(void *ctx, const char *opts,
+                          const char *key_val_sep, const char *pairs_sep);
+
 #endif  /* AVFILTER_PARSEUTILS_H */