Gets length memory blocks in buffer starting at idx. The memory blocks will be merged into one large #GstMemory.
If length is -1, all memory starting from idx is merged.
an index
a length
a #GstMemory that contains the merged data of length blocks starting at idx.
Gets length memory blocks in buffer starting at idx. The memory blocks will be merged into one large #GstMemory.
If length is -1, all memory starting from idx is merged.