v4l2_m2m.h File Reference

#include <semaphore.h>
#include <unistd.h>
#include <dirent.h>
#include <linux/videodev2.h>
#include "libavcodec/avcodec.h"
#include "v4l2_context.h"

Go to the source code of this file.

Data Structures
struct	V4L2m2mContext
struct	V4L2m2mPriv

Macros
#define	container_of(ptr, type, member)
#define	V4L_M2M_DEFAULT_OPTS

Functions
int	ff_v4l2_m2m_create_context (AVCodecContext *avctx, V4L2m2mContext **s)
	Allocate a new context and references for a V4L2 M2M instance. More...
int	ff_v4l2_m2m_codec_init (AVCodecContext *avctx)
	Probes the video nodes looking for the required codec capabilities. More...
int	ff_v4l2_m2m_codec_end (AVCodecContext *avctx)
	Releases all the codec resources if all AVBufferRefs have been returned to the ctx. More...
int	ff_v4l2_m2m_codec_reinit (V4L2m2mContext *ctx)
	Reinitializes the V4L2m2mContext when the driver cant continue processing with the capture parameters. More...
int	ff_v4l2_m2m_codec_full_reinit (V4L2m2mContext *ctx)
	Reinitializes the V4L2m2mContext when the driver cant continue processing with the any of the current V4L2Contexts (ie, changes in output and capture). More...

Macro Definition Documentation

container_of

#define container_of	(		ptr,
			type,
			member
	)

Value:

({ \
        const __typeof__(((type *)0)->member ) *__mptr = (ptr); \
        (type *)((char *)__mptr - offsetof(type,member) );})

Definition at line 35 of file v4l2_m2m.h.

Referenced by buf_to_m2mctx(), and ctx_to_m2mctx().

V4L_M2M_DEFAULT_OPTS

#define V4L_M2M_DEFAULT_OPTS

Value:

{ "num_output_buffers", "Number of buffers in the output context",\
        OFFSET(num_output_buffers), AV_OPT_TYPE_INT, { .i64 = 16 }, 6, INT_MAX, FLAGS }

Definition at line 39 of file v4l2_m2m.h.

Function Documentation

ff_v4l2_m2m_create_context()

int ff_v4l2_m2m_create_context	(	AVCodecContext *	avctx,
		V4L2m2mContext **	s
	)

Allocate a new context and references for a V4L2 M2M instance.

Parameters

[in]	ctx	The AVCodecContext instantiated by the encoder/decoder.
[out]	ctx	The V4L2m2mContext.

Returns

0 in success, a negative error code otherwise.

Definition at line 382 of file v4l2_m2m.c.

Referenced by v4l2_decode_init(), and v4l2_encode_init().

ff_v4l2_m2m_codec_init()

int ff_v4l2_m2m_codec_init

(

AVCodecContext *

avctx

)

Probes the video nodes looking for the required codec capabilities.

Parameters

[in]

ctx

The AVCodecContext instantiated by the encoder/decoder.

Returns

0 if a driver is found, a negative number otherwise.

Definition at line 341 of file v4l2_m2m.c.

Referenced by v4l2_decode_init(), and v4l2_encode_init().

ff_v4l2_m2m_codec_end()

int ff_v4l2_m2m_codec_end

(

AVCodecContext *

avctx

)

Releases all the codec resources if all AVBufferRefs have been returned to the ctx.

Otherwise keep the driver open.

Parameters

[in]

The

AVCodecContext instantiated by the encoder/decoder.

Returns

0

Definition at line 319 of file v4l2_m2m.c.

ff_v4l2_m2m_codec_reinit()

int ff_v4l2_m2m_codec_reinit

(

V4L2m2mContext *

ctx

)

Reinitializes the V4L2m2mContext when the driver cant continue processing with the capture parameters.

Parameters

[in]

ctx

The V4L2m2mContext instantiated by the encoder/decoder.

Returns

0 in case of success, negative number otherwise

Definition at line 189 of file v4l2_m2m.c.

Referenced by v4l2_handle_event().

ff_v4l2_m2m_codec_full_reinit()

int ff_v4l2_m2m_codec_full_reinit

(

V4L2m2mContext *

ctx

)

Reinitializes the V4L2m2mContext when the driver cant continue processing with the any of the current V4L2Contexts (ie, changes in output and capture).

Parameters

[in]

ctx

The V4L2m2mContext instantiated by the encoder/decoder.

Returns

0 in case of success, negative number otherwise

Definition at line 231 of file v4l2_m2m.c.

Referenced by v4l2_handle_event().