upipe_http_src: add support for ranged request

include/upipe-modules/upipe_http_source.h

@@ -38,6 +38,61 @@ extern "C" {
 
 #define UPIPE_HTTP_SRC_SIGNATURE UBASE_FOURCC('h','t','t','p')
 
+/** @This extends upipe_command with specific commands for http source. */
+enum upipe_http_src_command {
+    UPIPE_HTTP_SRC_SENTINEL = UPIPE_CONTROL_LOCAL,
+
+    /** returns the reading position of the current http request, in octets
+     * (uint64_t *) */
+    UPIPE_HTTP_SRC_GET_POSITION,
+    /** asks to get at the given position (uint64_t), using Range header */
+    UPIPE_HTTP_SRC_SET_POSITION,
+    /** asks to get at the given position (uint64_t), the given size
+     * (uint64_t), using Range header */
+    UPIPE_HTTP_SRC_SET_RANGE,
+};
+
+/** @This returns the reading position of the current http request.
+ *
+ * @param upipe description structure of the pipe
+ * @param position_p filled in with the reading position, in octets
+ * @return an error code
+ */
+static inline int upipe_http_src_get_position(struct upipe *upipe,
+                                              uint64_t *position_p)
+{
+    return upipe_control(upipe, UPIPE_HTTP_SRC_GET_POSITION,
+                         UPIPE_HTTP_SRC_SIGNATURE, position_p);
+}
+
+/** @This request the given position using Range header
+ *
+ * @param upipe description structure of the pipe
+ * @param position new reading position, in octets (between 0 and the size)
+ * @return an error code
+ */
+static inline int upipe_http_src_set_position(struct upipe *upipe,
+                                              uint64_t position)
+{
+    return upipe_control(upipe, UPIPE_HTTP_SRC_SET_POSITION,
+                         UPIPE_HTTP_SRC_SIGNATURE, position);
+}
+
+/** @This request the given range
+ *
+ * @param upipe description structure of the pipe
+ * @param offset range starts at offset, in octets
+ * @param length octets to read from offset, in octets
+ * @return an error code
+ */
+static inline int upipe_http_src_set_range(struct upipe *upipe,
+                                           uint64_t offset,
+                                           uint64_t length)
+{
+    return upipe_control(upipe, UPIPE_HTTP_SRC_SET_RANGE,
+                         UPIPE_HTTP_SRC_SIGNATURE, offset, length);
+}
+
 /** @This returns the management structure for all http sources.
  *
  * @return pointer to manager