@param size size of each buffer in this pool
@param alloc a function that will be used to allocate new buffers when the
pool is empty. May be NULL, then the default allocator will be used
(av_buffer_alloc()).
@return newly created buffer pool on success, NULL on error.
Allocate and initialize a buffer pool.
@param size size of each buffer in this pool @param alloc a function that will be used to allocate new buffers when the pool is empty. May be NULL, then the default allocator will be used (av_buffer_alloc()). @return newly created buffer pool on success, NULL on error.