http: export icecast metadata as an option with name "metadata".

Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavformat/http.c

@@ -80,6 +80,7 @@ typedef struct {
     int icy_metaint;
     char *icy_metadata_headers;
     char *icy_metadata_packet;
+    AVDictionary *metadata;
 #if CONFIG_ZLIB
     int compressed;
     z_stream inflate_stream;
@@ -107,6 +108,7 @@ static const AVOption options[] = {
     { "icy", "request ICY metadata", OFFSET(icy), AV_OPT_TYPE_INT, { .i64 = 0 }, 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 },
     { "auth_type", "HTTP authentication type", OFFSET(auth_state.auth_type), AV_OPT_TYPE_INT, { .i64 = HTTP_AUTH_NONE }, HTTP_AUTH_NONE, HTTP_AUTH_BASIC, D | E, "auth_type"},
     { "none", "No auth method set, autodetect", 0, AV_OPT_TYPE_CONST, { .i64 = HTTP_AUTH_NONE }, 0, 0, D | E, "auth_type"},
     { "basic", "HTTP basic authentication", 0, AV_OPT_TYPE_CONST, { .i64 = HTTP_AUTH_BASIC }, 0, 0, D | E, "auth_type"},
@@ -421,6 +423,8 @@ static int parse_icy(HTTPContext *s, const char *tag, const char *p)
     int is_first = !s->icy_metadata_headers;
     int ret;
 
+    av_dict_set(&s->metadata, tag, p, 0);
+
     if (s->icy_metadata_headers)
         len += strlen(s->icy_metadata_headers);
 
@@ -800,6 +804,32 @@ static int http_read_stream_all(URLContext *h, uint8_t *buf, int size)
     return pos;
 }
 
+static void update_metadata(HTTPContext *s, char *data)
+{
+    char *key;
+    char *val;
+    char *end;
+    char *next = data;
+
+    while (*next) {
+        key = next;
+        val = strstr(key, "='");
+        if (!val)
+            break;
+        end = strstr(val, "';");
+        if (!end)
+            break;
+
+        *val = '\0';
+        *end = '\0';
+        val += 2;
+
+        av_dict_set(&s->metadata, key, val, 0);
+
+        next = end + 2;
+    }
+}
+
 static int store_icy(URLContext *h, int size)
 {
     HTTPContext *s = h->priv_data;
@@ -828,6 +858,7 @@ static int store_icy(URLContext *h, int size)
             data[len + 1] = 0;
             if ((ret = av_opt_set(s, "icy_metadata_packet", data, 0)) < 0)
                 return ret;
+            update_metadata(s, data);
         }
         s->icy_data_read = 0;
         remaining        = s->icy_metaint;