FFmpeg
Functions

Functions for working with pixel formats. More...

Functions

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...
 
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_default_get_format (struct AVCodecContext *s, const enum AVPixelFormat *fmt)
 

Detailed Description

Functions for working with pixel formats.

Function Documentation

◆ avcodec_pix_fmt_to_codec_tag()

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 305 of file raw.c.

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

◆ avcodec_find_best_pix_fmt_of_list()

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_listAV_PIX_FMT_NONE terminated array of pixel formats to choose from
[in]src_pix_fmtsource pixel format
[in]has_alphaWhether the source pixel format alpha channel is used.
[out]loss_ptrCombination 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 31 of file imgconvert.c.

◆ avcodec_default_get_format()

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

Definition at line 860 of file decode.c.

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