Functions for working with pixel formats. More...

Functions
void	avcodec_get_chroma_sub_sample (enum AVPixelFormat pix_fmt, int h_shift, int v_shift)
	Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor. More...

unsigned int	avcodec_pix_fmt_to_codec_tag (enum AVPixelFormat pix_fmt)
	Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found. More...

int	avcodec_get_pix_fmt_loss (enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)

enum AVPixelFormat	avcodec_find_best_pix_fmt_of_list (const enum AVPixelFormat pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int loss_ptr)
	Find the best pixel format to convert to given a certain source pixel format. More...

enum AVPixelFormat	avcodec_find_best_pix_fmt_of_2 (enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)

attribute_deprecated enum AVPixelFormat	avcodec_find_best_pix_fmt2 (enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)

enum AVPixelFormat	avcodec_default_get_format (struct AVCodecContext s, const enum AVPixelFormat fmt)

Detailed Description

Functions for working with pixel formats.

Function Documentation

void avcodec_get_chroma_sub_sample	(	enum AVPixelFormat	pix_fmt,
		int *	h_shift,
		int *	v_shift
	)

Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.

This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample for one that returns a failure code and continues in case of invalid pix_fmts.

Parameters

[in]	pix_fmt	the pixel format
[out]	h_shift	store log2_chroma_w
[out]	v_shift	store log2_chroma_h

See Also: av_pix_fmt_get_chroma_sub_sample

Definition at line 38 of file imgconvert.c.

Referenced by alloc_buffers(), dirac_decode_data_unit(), encode_init(), ff_mjpeg_decode_frame(), ff_mpv_common_init(), ff_print_debug_info2(), get_buffer_with_edge(), j2kenc_init(), vc2_encode_init(), and vp3_decode_init().

unsigned int avcodec_pix_fmt_to_codec_tag ( enum AVPixelFormat pix_fmt )

Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found.

Definition at line 288 of file raw.c.

Referenced by avformat_find_stream_info(), raw_encode_init(), and v4l2_read_header().

int avcodec_get_pix_fmt_loss	(	enum AVPixelFormat	dst_pix_fmt,
		enum AVPixelFormat	src_pix_fmt,
		int	has_alpha
	)

Deprecated:: see av_get_pix_fmt_loss()

Definition at line 47 of file imgconvert.c.

enum AVPixelFormat avcodec_find_best_pix_fmt_of_list	(	const enum AVPixelFormat *	pix_fmt_list,
		enum AVPixelFormat	src_pix_fmt,
		int	has_alpha,
		int *	loss_ptr
	)

Find the best pixel format to convert to given a certain source pixel format.

When converting from one pixel format to another, information loss may occur. For example, when converting from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of the given pixel formats should be used to suffer the least amount of loss. The pixel formats from which it chooses one, are determined by the pix_fmt_list parameter.

Parameters

[in]	pix_fmt_list	AV_PIX_FMT_NONE terminated array of pixel formats to choose from
[in]	src_pix_fmt	source pixel format
[in]	has_alpha	Whether the source pixel format alpha channel is used.
[out]	loss_ptr	Combination of flags informing you what kind of losses will occur.

Returns: The best pixel format to convert to or -1 if none was found.

Definition at line 66 of file imgconvert.c.

enum AVPixelFormat avcodec_find_best_pix_fmt_of_2	(	enum AVPixelFormat	dst_pix_fmt1,
		enum AVPixelFormat	dst_pix_fmt2,
		enum AVPixelFormat	src_pix_fmt,
		int	has_alpha,
		int *	loss_ptr
	)

Deprecated:: see av_find_best_pix_fmt_of_2()

Definition at line 54 of file imgconvert.c.

Referenced by avcodec_find_best_pix_fmt2(), avcodec_find_best_pix_fmt_of_list(), and choose_pixel_fmt().

attribute_deprecated enum AVPixelFormat avcodec_find_best_pix_fmt2	(	enum AVPixelFormat	dst_pix_fmt1,
		enum AVPixelFormat	dst_pix_fmt2,
		enum AVPixelFormat	src_pix_fmt,
		int	has_alpha,
		int *	loss_ptr
	)

Definition at line 60 of file imgconvert.c.

enum AVPixelFormat avcodec_default_get_format	(	struct AVCodecContext *	s,
		const enum AVPixelFormat *	fmt
	)

Definition at line 1053 of file utils.c.

Referenced by ff_thread_get_format(), init_context_defaults(), and submit_packet().