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xrt: Add frameserver interface

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Jakob Bornecrantz 2019-07-10 12:56:03 +01:00
parent 833ca3f8f9
commit b0337f29da
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src/xrt/include/xrt/xrt_frameserver.h Normal file
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// Copyright 2019, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
* @file
* @brief Frameserver interface for video drivers.
* @author Pete Black <pblack@collabora.com>
* @author Ryan Pavlik <ryan.pavlik@collabora.com>
* @author Jakob Bornecrantz <jakob@collabora.com>
* @ingroup xrt_iface
*/
#pragma once
#include "xrt/xrt_defines.h"
#ifdef __cplusplus
extern "C" {
#endif
/*!
* What type of stereo format this frame has.
*
* @ingroup xrt_iface
*/
enum xrt_fs_stereo_format
{
XRT_FS_STEREO_NONE,
XRT_FS_STEREO_SBS, //!< Side by side
XRT_FS_STEREO_OAU, //!< Over & Under
};
/*!
* Basic frame data structure - holds a pointer to buffer.
*
* @ingroup xrt_iface
*/
struct xrt_fs_frame
{
uint32_t width;
uint32_t height;
size_t stride;
size_t size;
uint8_t *data;
enum xrt_format format;
enum xrt_fs_stereo_format stereo_format;
uint64_t timestamp;
uint64_t source_timestamp;
uint64_t source_sequence; //!< sequence id
uint64_t source_id; //!< Which @ref xrt_fs this frame originated from.
};
/*!
* A object that is sent frames.
*
* @ingroup xrt_iface
*/
struct xrt_fs_sink
{
/*!
* Push a frame into the sink.
*/
void (*push_frame)(struct xrt_fs_sink *sink,
struct xrt_fs_frame *frame);
};
/*!
* Controlling the camera capture parameters
*
* Used to configure cameras. since there is no guarantee every
* frameserver will support any/all of these params, a 'best effort'
* should be made to apply them. all numeric values are normalised
* floats for broad applicability.
*
* @ingroup xrt_iface
*/
struct xrt_fs_capture_parameters
{
float gain;
float exposure;
};
struct xrt_fs_mode
{
uint32_t width;
uint32_t height;
enum xrt_format format;
enum xrt_fs_stereo_format stereo_format;
};
/*!
* Frameserver that generates frame, multiple subframes (like stereo and
* mipmaps) can be generate in one frame.
*
* @ingroup xrt_iface
*/
struct xrt_fs
{
/*!
* All frames produced by this frameserver is tagged with this id.
*/
uint64_t source_id;
/*!
* Enumerate all available modes that this frameserver supports.
*/
bool (*enumerate_modes)(struct xrt_fs *xfs,
struct xrt_fs_mode **out_modes,
uint32_t *out_count);
/*!
* Set the capture parameters, may not be supported on all capture
* devices.
*/
bool (*configure_capture)(struct xrt_fs *xfs,
struct xrt_fs_capture_parameters *cp);
/*!
* Start the capture stream.
*/
bool (*stream_start)(struct xrt_fs *xfs, uint32_t descriptor_index);
/*!
* Stop the capture stream.
*/
bool (*stream_stop)(struct xrt_fs *xfs);
/*!
* Is the capture stream running.
*/
bool (*is_running)(struct xrt_fs *xfs);
/*!
* Destroy the frameserver, also stops the capture stream.
*/
void (*destroy)(struct xrt_fs *xfs);
};
/*!
* Helper for xrt_fs::enumerate_modes.
*
* @ingroup xrt_iface
*/
static inline XRT_MAYBE_UNUSED bool
xrt_fs_enumerate_modes(struct xrt_fs *xfs,
struct xrt_fs_mode **out_modes,
uint32_t *out_count)
{
return xfs->enumerate_modes(xfs, out_modes, out_count);
}
/*!
* Helper for xrt_fs::configure_capture.
*
* @ingroup xrt_iface
*/
static inline XRT_MAYBE_UNUSED bool
xrt_fs_configure_capture(struct xrt_fs *xfs,
struct xrt_fs_capture_parameters *cp)
{
return xfs->configure_capture(xfs, cp);
}
/*!
* Helper for xrt_fs::stream_start.
*
* @ingroup xrt_iface
*/
static inline XRT_MAYBE_UNUSED bool
xrt_fs_stream_start(struct xrt_fs *xfs, uint32_t descriptor_index)
{
return xfs->stream_start(xfs, descriptor_index);
}
/*!
* Helper for xrt_fs::stream_stop.
*
* @ingroup xrt_iface
*/
static inline XRT_MAYBE_UNUSED bool
xrt_fs_stream_stop(struct xrt_fs *xfs)
{
return xfs->stream_stop(xfs);
}
/*!
* Helper for xrt_fs::is_running.
*
* @ingroup xrt_iface
*/
static inline XRT_MAYBE_UNUSED bool
xrt_fs_is_running(struct xrt_fs *xfs)
{
return xfs->is_running(xfs);
}
/*!
* Helper for xrt_fs::destroy.
*
* @ingroup xrt_iface
*/
static inline XRT_MAYBE_UNUSED void
xrt_fs_destroy(struct xrt_fs **xfs_ptr)
{
struct xrt_fs *xfs = *xfs_ptr;
if (xfs == NULL) {
return;
}
xfs->destroy(xfs);
*xfs_ptr = NULL;
}
#ifdef __cplusplus
}
#endif