V4L2Context Struct Reference

#include <libavcodec/v4l2_context.h>

Data Fields
const char *	name
	context name. More...
enum v4l2_buf_type	type
	Type of this buffer context. More...
enum AVPixelFormat	av_pix_fmt
	AVPixelFormat corresponding to this buffer context. More...
enum AVCodecID	av_codec_id
	AVCodecID corresponding to this buffer context. More...
struct v4l2_format	format
	Format returned by the driver after initializing the buffer context. More...
int	width
	Width and height of the frames it produces (in case of a capture context, e.g. More...
int	height
V4L2Buffer *	buffers
	Indexed array of V4L2Buffers. More...
int	num_buffers
	Readonly after init. More...
int	streamon
	Whether the stream has been started (VIDIOC_STREAMON has been sent). More...
int	done
	Either no more buffers available or an unrecoverable error was notified by the V4L2 kernel driver: once set the context has to be exited. More...
AVClass *	class
int	fd

Detailed Description

Definition at line 36 of file v4l2_context.h.

Field Documentation

name

const char* V4L2Context::name

context name.

Definition at line 40 of file v4l2_context.h.

Referenced by ff_v4l2_buffer_buf_to_avframe(), ff_v4l2_buffer_buf_to_avpkt(), ff_v4l2_context_enqueue_frame(), ff_v4l2_context_enqueue_packet(), ff_v4l2_context_init(), ff_v4l2_context_release(), ff_v4l2_m2m_codec_end(), v4l2_dequeue_v4l2buf(), v4l2_handle_event(), v4l2_prepare_contexts(), v4l2_release_buffers(), and v4l2_resolution_changed().

type

enum v4l2_buf_type V4L2Context::type

Type of this buffer context.

See V4L2_BUF_TYPE_VIDEO_* in videodev2.h Readonly after init.

Definition at line 47 of file v4l2_context.h.

Referenced by buf_to_m2mctx(), ctx_to_m2mctx(), ff_v4l2_buffer_initialize(), ff_v4l2_context_init(), ff_v4l2_context_set_status(), v4l2_dequeue_v4l2buf(), v4l2_get_coded_format(), v4l2_get_raw_format(), v4l2_getfree_v4l2buf(), v4l2_prepare_contexts(), v4l2_release_buffers(), v4l2_resolution_changed(), v4l2_save_to_context(), v4l2_set_timeperframe(), v4l2_try_raw_format(), v4l2_try_start(), and v4l2_type_supported().

av_pix_fmt

enum AVPixelFormat V4L2Context::av_pix_fmt

AVPixelFormat corresponding to this buffer context.

AV_PIX_FMT_NONE means this is an encoded stream.

Definition at line 53 of file v4l2_context.h.

Referenced by ff_v4l2_buffer_buf_to_avframe(), v4l2_decode_init(), v4l2_encode_init(), v4l2_get_raw_format(), v4l2_save_to_context(), and v4l2_try_start().

av_codec_id

enum AVCodecID V4L2Context::av_codec_id

AVCodecID corresponding to this buffer context.

AV_CODEC_ID_RAWVIDEO means this is a raw stream and av_pix_fmt must be set to a valid value.

Definition at line 59 of file v4l2_context.h.

Referenced by ff_v4l2_context_get_format(), v4l2_decode_init(), v4l2_encode_init(), and v4l2_get_coded_format().

format

struct v4l2_format V4L2Context::format

Format returned by the driver after initializing the buffer context.

Readonly after init.

Definition at line 65 of file v4l2_context.h.

Referenced by ff_v4l2_buffer_buf_to_avframe(), ff_v4l2_buffer_initialize(), ff_v4l2_context_get_format(), ff_v4l2_context_init(), ff_v4l2_context_set_format(), v4l2_get_color_primaries(), v4l2_get_color_range(), v4l2_get_color_space(), v4l2_get_color_trc(), v4l2_handle_event(), v4l2_resolution_changed(), v4l2_save_to_context(), v4l2_try_raw_format(), and v4l2_try_start().

width

int V4L2Context::width

Width and height of the frames it produces (in case of a capture context, e.g.

when decoding) or accepts (in case of an output context, e.g. when encoding).

Definition at line 71 of file v4l2_context.h.

Referenced by ff_v4l2_buffer_buf_to_avframe(), v4l2_decode_init(), v4l2_encode_init(), v4l2_handle_event(), v4l2_save_to_context(), and v4l2_try_start().

height

int V4L2Context::height

Definition at line 71 of file v4l2_context.h.

Referenced by ff_v4l2_buffer_buf_to_avframe(), v4l2_decode_init(), v4l2_encode_init(), v4l2_handle_event(), v4l2_save_to_context(), and v4l2_try_start().

buffers

V4L2Buffer* V4L2Context::buffers

Indexed array of V4L2Buffers.

Definition at line 76 of file v4l2_context.h.

Referenced by ff_v4l2_context_init(), ff_v4l2_context_release(), v4l2_dequeue_v4l2buf(), v4l2_getfree_v4l2buf(), v4l2_release_buffers(), and v4l2_try_start().

num_buffers

int V4L2Context::num_buffers

Readonly after init.

Definition at line 81 of file v4l2_context.h.

Referenced by ff_v4l2_context_init(), ff_v4l2_m2m_create_context(), v4l2_dequeue_v4l2buf(), v4l2_getfree_v4l2buf(), and v4l2_release_buffers().

streamon

int V4L2Context::streamon

Whether the stream has been started (VIDIOC_STREAMON has been sent).

Definition at line 86 of file v4l2_context.h.

Referenced by ff_v4l2_context_set_status(), v4l2_free_buffer(), v4l2_receive_packet(), and v4l2_try_start().

done

int V4L2Context::done

Either no more buffers available or an unrecoverable error was notified by the V4L2 kernel driver: once set the context has to be exited.

Definition at line 92 of file v4l2_context.h.

Referenced by ff_v4l2_context_dequeue_frame(), ff_v4l2_context_dequeue_packet(), v4l2_dequeue_v4l2buf(), and v4l2_prepare_contexts().

class

AVClass* V4L2Context::class

Definition at line 25 of file v4l2enc.c.

fd

int V4L2Context::fd

Definition at line 26 of file v4l2enc.c.

Referenced by write_header(), write_packet(), and write_trailer().

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The documentation for this struct was generated from the following files:

• libavcodec/v4l2_context.h
• libavdevice/v4l2enc.c