avutil/error: Add HTTP 429 Too Many Requests AVERROR code

This is a common error code from e.g. CDNs or cloud storage, and
it is useful to be able to handle it differently to a generic
4XX code.

Its source is RFC6585.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libavutil/error.c

@@ -61,6 +61,7 @@ static const struct error_entry error_entries[] = {
     { ERROR_TAG(HTTP_UNAUTHORIZED),  "Server returned 401 Unauthorized (authorization failed)" },
     { ERROR_TAG(HTTP_FORBIDDEN),     "Server returned 403 Forbidden (access denied)" },
     { ERROR_TAG(HTTP_NOT_FOUND),     "Server returned 404 Not Found"           },
+    { ERROR_TAG(HTTP_TOO_MANY_REQUESTS), "Server returned 429 Too Many Requests"      },
     { ERROR_TAG(HTTP_OTHER_4XX),     "Server returned 4XX Client Error, but not one of 40{0,1,3,4}" },
     { ERROR_TAG(HTTP_SERVER_ERROR),  "Server returned 5XX Server Error reply" },
 #if !HAVE_STRERROR_R

libavutil/error.h

@@ -79,6 +79,7 @@
 #define AVERROR_HTTP_UNAUTHORIZED  FFERRTAG(0xF8,'4','0','1')
 #define AVERROR_HTTP_FORBIDDEN     FFERRTAG(0xF8,'4','0','3')
 #define AVERROR_HTTP_NOT_FOUND     FFERRTAG(0xF8,'4','0','4')
+#define AVERROR_HTTP_TOO_MANY_REQUESTS FFERRTAG(0xF8,'4','2','9')
 #define AVERROR_HTTP_OTHER_4XX     FFERRTAG(0xF8,'4','X','X')
 #define AVERROR_HTTP_SERVER_ERROR  FFERRTAG(0xF8,'5','X','X')
 

libavutil/version.h

@@ -80,7 +80,7 @@
 
 #define LIBAVUTIL_VERSION_MAJOR  59
 #define LIBAVUTIL_VERSION_MINOR  16
-#define LIBAVUTIL_VERSION_MICRO 100
+#define LIBAVUTIL_VERSION_MICRO 101
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \