v4l2_context.c File Reference

#include <linux/videodev2.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#include "libavcodec/avcodec.h"
#include "decode.h"
#include "v4l2_buffers.h"
#include "v4l2_fmt.h"
#include "v4l2_m2m.h"

Go to the source code of this file.

Data Structures
struct	v4l2_format_update

Functions
static V4L2m2mContext *	ctx_to_m2mctx (V4L2Context *ctx)
static AVCodecContext *	logger (V4L2Context *ctx)
static unsigned int	v4l2_get_width (struct v4l2_format *fmt)
static unsigned int	v4l2_get_height (struct v4l2_format *fmt)
static AVRational	v4l2_get_sar (V4L2Context *ctx)
static unsigned int	v4l2_resolution_changed (V4L2Context *ctx, struct v4l2_format *fmt2)
static int	v4l2_type_supported (V4L2Context *ctx)
static int	v4l2_get_framesize_compressed (V4L2Context *ctx, int width, int height)
static void	v4l2_save_to_context (V4L2Context *ctx, struct v4l2_format_update *fmt)
static int	v4l2_start_decode (V4L2Context *ctx)
static int	v4l2_handle_event (V4L2Context *ctx)
	handle resolution change event and end of stream event returns 1 if reinit was successful, negative if it failed returns 0 if reinit was not executed More...
static int	v4l2_stop_decode (V4L2Context *ctx)
static int	v4l2_stop_encode (V4L2Context *ctx)
static V4L2Buffer *	v4l2_dequeue_v4l2buf (V4L2Context *ctx, int timeout)
static V4L2Buffer *	v4l2_getfree_v4l2buf (V4L2Context *ctx)
static int	v4l2_release_buffers (V4L2Context *ctx)
static int	v4l2_try_raw_format (V4L2Context *ctx, enum AVPixelFormat pixfmt)
static int	v4l2_get_raw_format (V4L2Context *ctx, enum AVPixelFormat *p)
static int	v4l2_get_coded_format (V4L2Context *ctx, uint32_t *p)
int	ff_v4l2_context_set_status (V4L2Context *ctx, uint32_t cmd)
	Sets the status of a V4L2Context. More...
int	ff_v4l2_context_enqueue_frame (V4L2Context *ctx, const AVFrame *frame)
	Enqueues a buffer to a V4L2Context from an AVFrame. More...
int	ff_v4l2_context_enqueue_packet (V4L2Context *ctx, const AVPacket *pkt)
	Enqueues a buffer to a V4L2Context from an AVPacket. More...
int	ff_v4l2_context_dequeue_frame (V4L2Context *ctx, AVFrame *frame, int timeout)
	Dequeues a buffer from a V4L2Context to an AVFrame. More...
int	ff_v4l2_context_dequeue_packet (V4L2Context *ctx, AVPacket *pkt)
	Dequeues a buffer from a V4L2Context to an AVPacket. More...
int	ff_v4l2_context_get_format (V4L2Context *ctx, int probe)
	Queries the driver for a valid v4l2 format and copies it to the context. More...
int	ff_v4l2_context_set_format (V4L2Context *ctx)
	Sets the V4L2Context format in the v4l2 driver. More...
void	ff_v4l2_context_release (V4L2Context *ctx)
	Releases a V4L2Context. More...
int	ff_v4l2_context_init (V4L2Context *ctx)
	Initializes a V4L2Context. More...

Function Documentation

ctx_to_m2mctx()

static V4L2m2mContext* ctx_to_m2mctx ( V4L2Context *  ctx )

inlinestatic

Definition at line 44 of file v4l2_context.c.

Referenced by ff_v4l2_context_enqueue_frame(), ff_v4l2_context_enqueue_packet(), ff_v4l2_context_get_format(), ff_v4l2_context_init(), ff_v4l2_context_set_format(), ff_v4l2_context_set_status(), logger(), v4l2_dequeue_v4l2buf(), v4l2_get_coded_format(), v4l2_get_framesize_compressed(), v4l2_get_raw_format(), v4l2_get_sar(), v4l2_handle_event(), v4l2_release_buffers(), v4l2_start_decode(), v4l2_stop_decode(), v4l2_stop_encode(), and v4l2_try_raw_format().

logger()

static AVCodecContext* logger ( V4L2Context *  ctx )

inlinestatic

Definition at line 51 of file v4l2_context.c.

Referenced by ff_v4l2_context_enqueue_frame(), ff_v4l2_context_enqueue_packet(), ff_v4l2_context_init(), ff_v4l2_context_release(), v4l2_dequeue_v4l2buf(), v4l2_handle_event(), v4l2_release_buffers(), and v4l2_resolution_changed().

v4l2_get_width()

static unsigned int v4l2_get_width ( struct v4l2_format *  fmt )

inlinestatic

Definition at line 56 of file v4l2_context.c.

Referenced by ff_v4l2_context_init(), v4l2_handle_event(), and v4l2_resolution_changed().

v4l2_get_height()

static unsigned int v4l2_get_height ( struct v4l2_format *  fmt )

inlinestatic

Definition at line 61 of file v4l2_context.c.

Referenced by ff_v4l2_context_init(), v4l2_handle_event(), and v4l2_resolution_changed().

v4l2_get_sar()

static AVRational v4l2_get_sar ( V4L2Context *  ctx )

static

Definition at line 66 of file v4l2_context.c.

Referenced by v4l2_handle_event().

v4l2_resolution_changed()

static unsigned int v4l2_resolution_changed ( V4L2Context *  ctx, struct v4l2_format *  fmt2  )

inlinestatic

Definition at line 84 of file v4l2_context.c.

Referenced by v4l2_handle_event().

v4l2_type_supported()

static int v4l2_type_supported ( V4L2Context *  ctx )

inlinestatic

Definition at line 103 of file v4l2_context.c.

Referenced by ff_v4l2_context_init().

v4l2_get_framesize_compressed()

static int v4l2_get_framesize_compressed ( V4L2Context *  ctx, int  width, int  height  )

inlinestatic

Definition at line 111 of file v4l2_context.c.

Referenced by v4l2_save_to_context().

v4l2_save_to_context()

static void v4l2_save_to_context ( V4L2Context *  ctx, struct v4l2_format_update *  fmt  )

inlinestatic

Definition at line 125 of file v4l2_context.c.

Referenced by ff_v4l2_context_get_format().

v4l2_start_decode()

static int v4l2_start_decode ( V4L2Context *  ctx )

static

Definition at line 156 of file v4l2_context.c.

Referenced by v4l2_handle_event().

v4l2_handle_event()

static int v4l2_handle_event ( V4L2Context *  ctx )

static

handle resolution change event and end of stream event returns 1 if reinit was successful, negative if it failed returns 0 if reinit was not executed

Definition at line 176 of file v4l2_context.c.

Referenced by v4l2_dequeue_v4l2buf().

v4l2_stop_decode()

static int v4l2_stop_decode ( V4L2Context *  ctx )

static

Definition at line 229 of file v4l2_context.c.

Referenced by ff_v4l2_context_enqueue_packet().

v4l2_stop_encode()

static int v4l2_stop_encode ( V4L2Context *  ctx )

static

Definition at line 249 of file v4l2_context.c.

Referenced by ff_v4l2_context_enqueue_frame().

v4l2_dequeue_v4l2buf()

static V4L2Buffer* v4l2_dequeue_v4l2buf ( V4L2Context *  ctx, int  timeout  )

static

Definition at line 269 of file v4l2_context.c.

Referenced by ff_v4l2_context_dequeue_frame(), ff_v4l2_context_dequeue_packet(), and v4l2_getfree_v4l2buf().

v4l2_getfree_v4l2buf()

static V4L2Buffer* v4l2_getfree_v4l2buf ( V4L2Context *  ctx )

static

Definition at line 420 of file v4l2_context.c.

Referenced by ff_v4l2_context_enqueue_frame(), and ff_v4l2_context_enqueue_packet().

v4l2_release_buffers()

static int v4l2_release_buffers ( V4L2Context *  ctx )

static

Definition at line 439 of file v4l2_context.c.

Referenced by ff_v4l2_context_init(), and ff_v4l2_context_release().

v4l2_try_raw_format()

static int v4l2_try_raw_format ( V4L2Context *  ctx, enum AVPixelFormat  pixfmt  )

inlinestatic

Definition at line 462 of file v4l2_context.c.

Referenced by v4l2_get_raw_format().

v4l2_get_raw_format()

static int v4l2_get_raw_format ( V4L2Context *  ctx, enum AVPixelFormat *  p  )

static

Definition at line 486 of file v4l2_context.c.

Referenced by ff_v4l2_context_get_format().

v4l2_get_coded_format()

static int v4l2_get_coded_format ( V4L2Context *  ctx, uint32_t *  p  )

static

Definition at line 521 of file v4l2_context.c.

Referenced by ff_v4l2_context_get_format().

ff_v4l2_context_set_status()

int ff_v4l2_context_set_status	(	V4L2Context *	ctx,
		uint32_t	cmd
	)

Sets the status of a V4L2Context.

Parameters

[in]	ctx	A pointer to a V4L2Context.
[in]	cmd	The status to set (VIDIOC_STREAMON or VIDIOC_STREAMOFF). Warning: If VIDIOC_STREAMOFF is sent to a buffer context that still has some frames buffered, those frames will be dropped.

Returns

0 in case of success, a negative value representing the error otherwise.

Definition at line 558 of file v4l2_context.c.

Referenced by ff_v4l2_m2m_codec_end(), ff_v4l2_m2m_codec_reinit(), v4l2_receive_packet(), v4l2_stop_decode(), v4l2_stop_encode(), and v4l2_try_start().

ff_v4l2_context_enqueue_frame()

int ff_v4l2_context_enqueue_frame	(	V4L2Context *	ctx,
		const AVFrame *	f
	)

Enqueues a buffer to a V4L2Context from an AVFrame.

The frame must be non NULL.

Parameters

[in]	ctx	The V4L2Context to enqueue to.
[in]	f	A pointer to an AVFrame to enqueue.

Returns

0 in case of success, a negative error otherwise.

Definition at line 572 of file v4l2_context.c.

Referenced by v4l2_send_frame().

ff_v4l2_context_enqueue_packet()

int ff_v4l2_context_enqueue_packet	(	V4L2Context *	ctx,
		const AVPacket *	pkt
	)

Enqueues a buffer to a V4L2Context from an AVPacket.

The packet must be non NULL. When the size of the pkt is null, the buffer is not queued but a V4L2_DEC_CMD_STOP command is sent instead to the driver.

Parameters

[in]	ctx	The V4L2Context to enqueue to.
[in]	pkt	A pointer to an AVPacket.

Returns

0 in case of success, a negative error otherwise.

Definition at line 597 of file v4l2_context.c.

Referenced by v4l2_receive_frame().

ff_v4l2_context_dequeue_frame()

int ff_v4l2_context_dequeue_frame	(	V4L2Context *	ctx,
		AVFrame *	f,
		int	timeout
	)

Dequeues a buffer from a V4L2Context to an AVFrame.

The frame must be non NULL.

Parameters

[in]	ctx	The V4L2Context to dequeue from.
[in,out]	f	The AVFrame to dequeue to.
[in]	timeout	The timeout for dequeue (-1 to block, 0 to return immediately, or milliseconds)

Returns

0 in case of success, AVERROR(EAGAIN) if no buffer was ready, another negative error in case of error.

Definition at line 622 of file v4l2_context.c.

Referenced by v4l2_receive_frame().

ff_v4l2_context_dequeue_packet()

int ff_v4l2_context_dequeue_packet	(	V4L2Context *	ctx,
		AVPacket *	pkt
	)

Dequeues a buffer from a V4L2Context to an AVPacket.

The pkt must be non NULL.

Parameters

[in]	ctx	The V4L2Context to dequeue from.
[in,out]	pkt	The AVPacket to dequeue to.

Returns

0 in case of success, AVERROR(EAGAIN) if no buffer was ready, another negative error in case of error.

Definition at line 642 of file v4l2_context.c.

Referenced by v4l2_receive_packet().

ff_v4l2_context_get_format()

int ff_v4l2_context_get_format	(	V4L2Context *	ctx,
		int	probe
	)

Queries the driver for a valid v4l2 format and copies it to the context.

Parameters

[in]	ctx	A pointer to a V4L2Context. See V4L2Context description for required variables.
[in]	probe	Probe only and ignore changes to the format.

Returns

0 in case of success, a negative value representing the error otherwise.

Definition at line 662 of file v4l2_context.c.

Referenced by ff_v4l2_m2m_codec_reinit(), and v4l2_probe_driver().

ff_v4l2_context_set_format()

int ff_v4l2_context_set_format

(

V4L2Context *

ctx

)

Sets the V4L2Context format in the v4l2 driver.

Parameters

[in]

ctx

A pointer to a V4L2Context. See V4L2Context description for required variables.

Returns

0 in case of success, a negative value representing the error otherwise.

Definition at line 689 of file v4l2_context.c.

Referenced by ff_v4l2_m2m_codec_reinit(), and v4l2_configure_contexts().

ff_v4l2_context_release()

void ff_v4l2_context_release

(

V4L2Context *

ctx

)

Releases a V4L2Context.

Parameters

[in]

ctx

A pointer to a V4L2Context. The caller is reponsible for freeing it. It must not be used after calling this function.

Definition at line 694 of file v4l2_context.c.

Referenced by ff_v4l2_m2m_codec_end(), ff_v4l2_m2m_codec_reinit(), and v4l2_m2m_destroy_context().

ff_v4l2_context_init()

int ff_v4l2_context_init

(

V4L2Context *

ctx

)

Initializes a V4L2Context.

Parameters

[in]

ctx

A pointer to a V4L2Context. See V4L2Context description for required variables.

Returns

0 in case of success, a negative value representing the error otherwise.

Definition at line 708 of file v4l2_context.c.

Referenced by v4l2_configure_contexts(), and v4l2_try_start().