The start offset of the buffer
The length of the buffer
a pointer to hold the GstBuffer, returns GST_FLOW_ERROR if NULL.
a GstFlowReturn from the peer pad. When this function returns GST_FLOW_OK, buffer will contain a valid GstBuffer that should be freed with gst_buffer_unref() after usage. buffer may not be used or freed when any other return value than GST_FLOW_OK is returned. MT safe.
Pulls a buffer from the peer pad. This function will first trigger the pad block signal if it was installed. When pad is not linked GST_FLOW_NOT_LINKED is returned else this function returns the result of gst_pad_get_range() on the peer pad. See gst_pad_get_range() for a list of return values and for the semantics of the arguments of this function. buffer's caps must either be unset or the same as what is already configured on pad. Renegotiation within a running pull-mode pipeline is not supported.