* @param link the output link to the filter from which the buffer will
* be requested
* @param perms the required access permissions
- * @param sample_fmt the format of each sample in the buffer to allocate
* @param nb_samples the number of samples per channel
- * @param channel_layout the number and type of channels per sample in the buffer to allocate
- * @param planar audio data layout - planar or packed
* @return A reference to the samples. This must be unreferenced with
* avfilter_unref_buffer when you are finished with it.
*/