http: enable icy metadata by default.

It won't hurt servers that don't care about the header,
and those that do will include it by default.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Changelog

@@ -29,6 +29,7 @@ version <next>:
 - display matrix export and rotation api
 - drop avserver, it was unmaintained for years and largely broken
 - Icecast protocol
+- request icecast metadata by default
 
 
 version 10:

doc/protocols.texi

@@ -119,7 +119,7 @@ Export the MIME type.
 If set to 1 request ICY (SHOUTcast) metadata from the server. If the server
 supports this, the metadata has to be retrieved by the application by reading
 the @option{icy_metadata_headers} and @option{icy_metadata_packet} options.
-The default is 0.
+The default is 1.
 
 @item icy_metadata_headers
 If the server supports ICY metadata, this contains the ICY-specific HTTP reply

libavformat/http.c

@@ -105,7 +105,7 @@ static const AVOption options[] = {
     { "multiple_requests", "use persistent connections", OFFSET(multiple_requests), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D | E },
     { "post_data", "set custom HTTP post data", OFFSET(post_data), AV_OPT_TYPE_BINARY, .flags = D | E },
     { "mime_type", "export the MIME type", OFFSET(mime_type), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
-    { "icy", "request ICY metadata", OFFSET(icy), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D },
+    { "icy", "request ICY metadata", OFFSET(icy), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D },
     { "icy_metadata_headers", "return ICY metadata headers", OFFSET(icy_metadata_headers), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_EXPORT },
     { "icy_metadata_packet", "return current ICY metadata packet", OFFSET(icy_metadata_packet), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_EXPORT },
     { "metadata", "metadata read from the bitstream", OFFSET(metadata), AV_OPT_TYPE_DICT, {0}, 0, 0, AV_OPT_FLAG_EXPORT },