IO area to exchange buffers. More...

#include <spa/node/io.h>

Data Fields
int32_t	status
	the status code

uint32_t	buffer_id
	a buffer id

Detailed Description

IO area to exchange buffers.

A set of buffers should first be configured on the node/port. Further references to those buffers will be made by using the id of the buffer.

If status is SPA_STATUS_OK, the host should ignore the io area.

If status is SPA_STATUS_NEED_DATA, the host should: 1) recycle the buffer in buffer_id, if possible 2) prepare a new buffer and place the id in buffer_id.

If status is SPA_STATUS_HAVE_DATA, the host should consume the buffer in buffer_id and set the state to SPA_STATUS_NEED_DATA when new data is requested.

If status is SPA_STATUS_STOPPED, some error occurred on the port.

If status is SPA_STATUS_DRAINED, data from the io area was used to drain.

Status can also be a negative errno value to indicate errors. such as: -EINVAL: buffer_id is invalid -EPIPE: no more buffers available