avformat/http: add ff_http_do_new_request2 for options

add ff_http_do_new_request2() which supports options to be applied to
HTTPContext after initialisation with the new uri
Signed-off-by: Steven Liu <lq@onvideo.cn>
Signed-off-by: vectronic <hello.vectronic@gmail.com>

libavformat/http.c

@@ -320,8 +320,11 @@ int ff_http_get_shutdown_status(URLContext *h)
     return ret;
 }
 
+int ff_http_do_new_request(URLContext *h, const char *uri) {
+    return ff_http_do_new_request2(h, uri, NULL);
+}
 
-int ff_http_do_new_request(URLContext *h, const char *uri)
+int ff_http_do_new_request2(URLContext *h, const char *uri, AVDictionary **opts)
 {
     HTTPContext *s = h->priv_data;
     AVDictionary *options = NULL;
@@ -366,6 +369,9 @@ int ff_http_do_new_request(URLContext *h, const char *uri)
     if (!s->location)
         return AVERROR(ENOMEM);
 
+    if ((ret = av_opt_set_dict(s, opts)) < 0)
+        return ret;
+
     av_log(s, AV_LOG_INFO, "Opening \'%s\' for %s\n", uri, h->flags & AVIO_FLAG_WRITE ? "writing" : "reading");
     ret = http_open_cnx(h, &options);
     av_dict_free(&options);

libavformat/http.h

@@ -56,6 +56,19 @@ int ff_http_get_shutdown_status(URLContext *h);
  */
 int ff_http_do_new_request(URLContext *h, const char *uri);
 
+/**
+ * Send a new HTTP request, reusing the old connection.
+ *
+ * @param h pointer to the resource
+ * @param uri uri used to perform the request
+ * @param options  A dictionary filled with HTTP options. On return
+ * this parameter will be destroyed and replaced with a dict containing options
+ * that were not found. May be NULL.
+ * @return a negative value if an error condition occurred, 0
+ * otherwise
+ */
+int ff_http_do_new_request2(URLContext *h, const char *uri, AVDictionary **options);
+
 int ff_http_averror(int status_code, int default_averror);
 
 #endif /* AVFORMAT_HTTP_H */