+#define URL_PROTOCOL_FLAG_NESTED_SCHEME 1 /*< The protocol name can be the first part of a nested protocol scheme */
+#define URL_PROTOCOL_FLAG_NETWORK 2 /*< The protocol uses network */
+
+extern int (*url_interrupt_cb)(void);
+
+extern const AVClass ffurl_context_class;
+
+typedef struct URLContext {
+ const AVClass *av_class; /**< information for av_log(). Set by url_open(). */
+ struct URLProtocol *prot;
+ void *priv_data;
+ char *filename; /**< specified URL */
+ int flags;
+ int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */
+ int is_streamed; /**< true if streamed (no seek possible), default = false */
+ int is_connected;
+ AVIOInterruptCB interrupt_callback;
+} URLContext;
+
+typedef struct URLProtocol {
+ const char *name;
+ int (*url_open)( URLContext *h, const char *url, int flags);
+ /**
+ * This callback is to be used by protocols which open further nested
+ * protocols. options are then to be passed to ffurl_open()/ffurl_connect()
+ * for those nested protocols.
+ */
+ int (*url_open2)(URLContext *h, const char *url, int flags, AVDictionary **options);
+
+ /**
+ * Read data from the protocol.
+ * If data is immediately available (even less than size), EOF is
+ * reached or an error occurs (including EINTR), return immediately.
+ * Otherwise:
+ * In non-blocking mode, return AVERROR(EAGAIN) immediately.
+ * In blocking mode, wait for data/EOF/error with a short timeout (0.1s),
+ * and return AVERROR(EAGAIN) on timeout.
+ * Checking interrupt_callback, looping on EINTR and EAGAIN and until
+ * enough data has been read is left to the calling function; see
+ * retry_transfer_wrapper in avio.c.
+ */
+ int (*url_read)( URLContext *h, unsigned char *buf, int size);
+ int (*url_write)(URLContext *h, const unsigned char *buf, int size);
+ int64_t (*url_seek)( URLContext *h, int64_t pos, int whence);
+ int (*url_close)(URLContext *h);
+ struct URLProtocol *next;
+ int (*url_read_pause)(URLContext *h, int pause);
+ int64_t (*url_read_seek)(URLContext *h, int stream_index,
+ int64_t timestamp, int flags);
+ int (*url_get_file_handle)(URLContext *h);
+ int priv_data_size;
+ const AVClass *priv_data_class;
+ int flags;
+ int (*url_check)(URLContext *h, int mask);
+} URLProtocol;