Create a new device of the specified type from an existing device.
If the source device is a device of the target type or was originally
derived from such a device (possibly through one or more intermediate
devices of other types), then this will return a reference to the
existing device of the same type as is requested.
Otherwise, it will attempt to derive a new device from the given source
device. If direct derivation to the new type is not implemented, it will
attempt the same derivation from each ancestor of the source device in
turn looking for an implemented derivation method.
@param dst_ctx On success, a reference to the newly-created
AVHWDeviceContext.
@param type The type of the new device to create.
@param src_ctx A reference to an existing AVHWDeviceContext which will be
used to create the new device.
@param flags Currently unused; should be set to zero.
@return Zero on success, a negative AVERROR code on failure.
Create a new device of the specified type from an existing device.
If the source device is a device of the target type or was originally derived from such a device (possibly through one or more intermediate devices of other types), then this will return a reference to the existing device of the same type as is requested.
Otherwise, it will attempt to derive a new device from the given source device. If direct derivation to the new type is not implemented, it will attempt the same derivation from each ancestor of the source device in turn looking for an implemented derivation method.
@param dst_ctx On success, a reference to the newly-created AVHWDeviceContext. @param type The type of the new device to create. @param src_ctx A reference to an existing AVHWDeviceContext which will be used to create the new device. @param flags Currently unused; should be set to zero. @return Zero on success, a negative AVERROR code on failure.