Get a list of possible source or target formats usable in
av_hwframe_transfer_data().
@param hwframe_ctx the frame context to obtain the information for
@param dir the direction of the transfer
@param formats the pointer to the output format list will be written here.
The list is terminated with AV_PIX_FMT_NONE and must be freed
by the caller when no longer needed using av_free().
If this function returns successfully, the format list will
have at least one item (not counting the terminator).
On failure, the contents of this pointer are unspecified.
@param flags currently unused, should be set to zero
@return 0 on success, a negative AVERROR code on failure.
Get a list of possible source or target formats usable in av_hwframe_transfer_data().
@param hwframe_ctx the frame context to obtain the information for @param dir the direction of the transfer @param formats the pointer to the output format list will be written here. The list is terminated with AV_PIX_FMT_NONE and must be freed by the caller when no longer needed using av_free(). If this function returns successfully, the format list will have at least one item (not counting the terminator). On failure, the contents of this pointer are unspecified. @param flags currently unused, should be set to zero @return 0 on success, a negative AVERROR code on failure.