Support for remote m3u playlists (ref pr #79)

src/http.h

@@ -0,0 +1,89 @@
+
+#ifndef __HTTP_H__
+#define __HTTP_H__
+
+#include <event2/buffer.h>
+#include <event2/http.h>
+
+#include <libavformat/avformat.h>
+
+struct http_client_ctx
+{
+  int async;
+  const char *url;
+  int ret;
+
+  /* For sync mode */
+  struct evbuffer *evbuf;
+
+  /* For async mode */
+  void (*cb)(struct evhttp_request *, void *);
+
+  /* Private */
+  void *evbase;
+};
+
+struct http_icy_metadata
+{
+  /* Static stream metadata from icy_metadata_headers */
+  char *name;
+  char *description;
+  char *genre;
+
+  /* Track specific, comes from icy_metadata_packet */
+  char *title;
+  char *artist;
+  char *artwork_url;
+
+  uint32_t hash;
+};
+
+
+/* Generic HTTP client
+ * Can be called blocking or non-blocking. No support for https.
+ *
+ * @param ctx HTTP request params, see above
+ * @return 0 if successful, -1 if an error occurred
+ */
+int
+http_client_request(struct http_client_ctx *ctx);
+
+
+/* Returns a newly allocated string with the first stream in the m3u given in
+ * url. If url is not a m3u, the string will be a copy of url.
+ *
+ * @param stream the newly allocated string with link to stream (NULL on error)
+ * @param url link to either stream or m3u
+ * @return 0 if successful, -1 if an error occurred
+ */
+int
+http_stream_setup(char **stream, const char *url);
+
+
+/* Frees a ICY metadata struct
+ *
+ * @param metadata struct to free
+ */
+void
+http_icy_metadata_free(struct http_icy_metadata *metadata);
+
+
+/* Extracts ICY header and packet metadata (requires libav 10)
+ *
+ *   example header metadata (standard http header format):
+ *     icy-name: Rock On Radio
+ *   example packet metadata (track currently being played):
+ *     StreamTitle='Robert Miles - Black Rubber';StreamUrl='';
+ *
+ * The extraction is straight from the stream and done in the player thread, so
+ * it must not produce significant delay.
+ *
+ * @param fmtctx the libav/ffmpeg AVFormatContext containing the stream
+ * @param packet_only only get currently playing info (see struct above)
+ * @return metadata struct if successful, NULL on error or nothing found
+ */
+struct http_icy_metadata *
+http_icy_metadata_get(AVFormatContext *fmtctx, int packet_only);
+
+
+#endif /* !__HTTP_H__ */