#include <inttypes.h>
#include "attributes.h"
#include "pixfmt.h"

Data Structures
struct	AVComponentDescriptor

struct	AVPixFmtDescriptor
	Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes of an image. More...

Macros
#define	AV_PIX_FMT_FLAG_BE (1 << 0)
	Pixel format is big-endian.

#define	AV_PIX_FMT_FLAG_PAL (1 << 1)
	Pixel format has a palette in data[1], values are indexes in this palette.

#define	AV_PIX_FMT_FLAG_BITSTREAM (1 << 2)
	All values of a component are bit-wise packed end to end.

#define	AV_PIX_FMT_FLAG_HWACCEL (1 << 3)
	Pixel format is an HW accelerated format.

#define	AV_PIX_FMT_FLAG_PLANAR (1 << 4)
	At least one pixel component is not in the first data plane.

#define	AV_PIX_FMT_FLAG_RGB (1 << 5)
	The pixel format contains RGB-like data (as opposed to YUV/grayscale).

#define	AV_PIX_FMT_FLAG_PSEUDOPAL (1 << 6)
	The pixel format is "pseudo-paletted".

#define	AV_PIX_FMT_FLAG_ALPHA (1 << 7)
	The pixel format has an alpha channel.

#define	PIX_FMT_BE AV_PIX_FMT_FLAG_BE

#define	PIX_FMT_PAL AV_PIX_FMT_FLAG_PAL

#define	PIX_FMT_BITSTREAM AV_PIX_FMT_FLAG_BITSTREAM

#define	PIX_FMT_HWACCEL AV_PIX_FMT_FLAG_HWACCEL

#define	PIX_FMT_PLANAR AV_PIX_FMT_FLAG_PLANAR

#define	PIX_FMT_RGB AV_PIX_FMT_FLAG_RGB

#define	PIX_FMT_PSEUDOPAL AV_PIX_FMT_FLAG_PSEUDOPAL

#define	PIX_FMT_ALPHA AV_PIX_FMT_FLAG_ALPHA

#define	FF_LOSS_RESOLUTION 0x0001
	loss due to resolution change

#define	FF_LOSS_DEPTH 0x0002
	loss due to color depth change

#define	FF_LOSS_COLORSPACE 0x0004
	loss due to color space conversion

#define	FF_LOSS_ALPHA 0x0008
	loss of alpha bits

#define	FF_LOSS_COLORQUANT 0x0010
	loss due to color quantization

#define	FF_LOSS_CHROMA 0x0020
	loss of chroma (e.g.

Functions
void	av_read_image_line (uint16_t dst, const uint8_t data[4], const int linesize[4], const AVPixFmtDescriptor *desc, int x, int y, int c, int w, int read_pal_component)
	Read a line from an image, and write the values of the pixel format component c to dst.

void	av_write_image_line (const uint16_t src, uint8_t data[4], const int linesize[4], const AVPixFmtDescriptor *desc, int x, int y, int c, int w)
	Write the values from src to the pixel format component c of an image line.

enum AVPixelFormat	av_get_pix_fmt (const char *name)
	Return the pixel format corresponding to name.

const char *	av_get_pix_fmt_name (enum AVPixelFormat pix_fmt)
	Return the short name for a pixel format, NULL in case pix_fmt is unknown.

char *	av_get_pix_fmt_string (char *buf, int buf_size, enum AVPixelFormat pix_fmt)
	Print in buf the string corresponding to the pixel format with number pix_fmt, or a header if pix_fmt is negative.

int	av_get_bits_per_pixel (const AVPixFmtDescriptor *pixdesc)
	Return the number of bits per pixel used by the pixel format described by pixdesc.

int	av_get_padded_bits_per_pixel (const AVPixFmtDescriptor *pixdesc)
	Return the number of bits per pixel for the pixel format described by pixdesc, including any padding or unused bits.

const AVPixFmtDescriptor *	av_pix_fmt_desc_get (enum AVPixelFormat pix_fmt)

const AVPixFmtDescriptor *	av_pix_fmt_desc_next (const AVPixFmtDescriptor *prev)
	Iterate over all pixel format descriptors known to libavutil.

enum AVPixelFormat	av_pix_fmt_desc_get_id (const AVPixFmtDescriptor *desc)

int	av_pix_fmt_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.

int	av_pix_fmt_count_planes (enum AVPixelFormat pix_fmt)

enum AVPixelFormat	av_pix_fmt_swap_endianness (enum AVPixelFormat pix_fmt)
	Utility function to swap the endianness of a pixel format.

int	av_get_pix_fmt_loss (enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)
	Compute what kind of losses will occur when converting from one specific pixel format to another.

enum AVPixelFormat	av_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)
	Compute what kind of losses will occur when converting from one specific pixel format to another.

const char *	av_color_range_name (enum AVColorRange range)

const char *	av_color_primaries_name (enum AVColorPrimaries primaries)

const char *	av_color_transfer_name (enum AVColorTransferCharacteristic transfer)

const char *	av_color_space_name (enum AVColorSpace space)

const char *	av_chroma_location_name (enum AVChromaLocation location)

Variables
attribute_deprecated const AVPixFmtDescriptor	av_pix_fmt_descriptors []
	The array of all the pixel format descriptors.

Macro Definition Documentation

#define AV_PIX_FMT_FLAG_BE (1 << 0)

Pixel format is big-endian.

Definition at line 111 of file pixdesc.h.

Referenced by av_read_image_line(), av_write_image_line(), encode_init(), is_planar_yuv(), isBE(), planarRgb16ToRgb16Wrapper(), query_formats(), raw_decode(), Rgb16ToPlanarRgb16Wrapper(), rgb48Toxyz12(), xwd_encode_frame(), and xyz12Torgb48().

#define AV_PIX_FMT_FLAG_PAL (1 << 1)

Pixel format has a palette in data[1], values are indexes in this palette.

Definition at line 115 of file pixdesc.h.

Referenced by av_image_alloc(), av_image_copy(), av_image_copy_to_buffer(), av_image_fill_pointers(), config_props(), filter_frame(), get_color_type(), get_video_buffer(), pix_fmt_match(), query_formats(), raw_init_decoder(), show_pix_fmts(), shuffleplanes_config_input(), smv_img_pnt(), and usePal().

#define AV_PIX_FMT_FLAG_BITSTREAM (1 << 2)

All values of a component are bit-wise packed end to end.

Definition at line 119 of file pixdesc.h.

Referenced by av_get_padded_bits_per_pixel(), av_read_image_line(), av_write_image_line(), ff_check_pixfmt_descriptors(), image_get_linesize(), query_formats(), and show_pix_fmts().

#define AV_PIX_FMT_FLAG_HWACCEL (1 << 3)

Pixel format is an HW accelerated format.

Definition at line 123 of file pixdesc.h.

Referenced by av_image_copy(), av_image_fill_linesizes(), av_image_fill_pointers(), av_image_get_linesize(), create_all_formats(), ff_all_formats(), ff_get_format(), get_buffer_internal(), get_format(), is_hwaccel_pix_fmt(), main(), query_formats(), show_pix_fmts(), and smv_img_pnt().

#define AV_PIX_FMT_FLAG_PLANAR (1 << 4)

At least one pixel component is not in the first data plane.

Definition at line 127 of file pixdesc.h.

Referenced by avpriv_color_frame(), config_input(), config_props(), encode_init(), ff_draw_init(), ff_pnm_decode_header(), init(), init_image(), is_planar_yuv(), is_yuv_planar(), isPackedRGB(), isPlanar(), isPlanarRGB(), isPlanarYUV(), jpeg2000_decode_tile(), opengl_draw(), planarRgb16ToRgb16Wrapper(), query_formats(), Rgb16ToPlanarRgb16Wrapper(), tiff_unpack_strip(), and write_header().

#define AV_PIX_FMT_FLAG_RGB (1 << 5)

The pixel format contains RGB-like data (as opposed to YUV/grayscale).

Definition at line 131 of file pixdesc.h.

Referenced by config_input(), config_props(), encode_init(), ff_draw_color(), ff_draw_init(), ffprobe_show_pixel_formats(), filter_frame(), get_color_type(), init_image(), is_yuv_planar(), isPackedRGB(), isPlanarRGB(), isRGB(), isYUV(), opengl_fill_color_map(), planarRgb16ToRgb16Wrapper(), Rgb16ToPlanarRgb16Wrapper(), and tiff_unpack_strip().

#define AV_PIX_FMT_FLAG_PSEUDOPAL (1 << 6)

The pixel format is "pseudo-paletted".

This means that it contains a fixed palette in the 2nd plane but the palette is fixed/constant for each PIX_FMT. This allows interpreting the data as if it was PAL8, which can in some cases be simpler. Or the data can be interpreted purely based on the pixel format without using the palette. An example of a pseudo-paletted format is AV_PIX_FMT_GRAY8

Definition at line 141 of file pixdesc.h.

Referenced by av_image_alloc(), av_image_copy(), av_image_fill_pointers(), av_image_get_buffer_size(), config_props(), ff_draw_init(), filter_frame(), get_video_buffer(), raw_decode(), raw_init_decoder(), shuffleplanes_config_input(), smv_img_pnt(), and usePal().

#define AV_PIX_FMT_FLAG_ALPHA (1 << 7)

The pixel format has an alpha channel.

This is set on all formats that support alpha in some way. The exception is AV_PIX_FMT_PAL8, which can carry alpha as part of the palette. Details are explained in the AVPixelFormat enum, and are also encoded in the corresponding AVPixFmtDescriptor.

The alpha is always straight, never pre-multiplied.

If a codec or a filter does not support alpha, it should set all alpha to opaque, or use the equivalent pixel formats without alpha component, e.g. AV_PIX_FMT_RGB0 (or AV_PIX_FMT_RGB24 etc.) instead of AV_PIX_FMT_RGBA.

Definition at line 156 of file pixdesc.h.

Referenced by config_input(), config_props(), encode_init(), ff_check_pixfmt_descriptors(), ff_draw_init(), ff_merge_formats(), is_planar_yuv(), isALPHA(), opengl_draw(), opengl_fill_color_map(), opengl_init_context(), Rgb16ToPlanarRgb16Wrapper(), and yuv2gbrp_full_X_c().

#define PIX_FMT_BE AV_PIX_FMT_FLAG_BE

Deprecated:: use the AV_PIX_FMT_FLAG_* flags

Definition at line 162 of file pixdesc.h.

#define PIX_FMT_PAL AV_PIX_FMT_FLAG_PAL

Definition at line 163 of file pixdesc.h.

#define PIX_FMT_BITSTREAM AV_PIX_FMT_FLAG_BITSTREAM

Definition at line 164 of file pixdesc.h.

#define PIX_FMT_HWACCEL AV_PIX_FMT_FLAG_HWACCEL

Definition at line 165 of file pixdesc.h.

#define PIX_FMT_PLANAR AV_PIX_FMT_FLAG_PLANAR

Definition at line 166 of file pixdesc.h.

#define PIX_FMT_RGB AV_PIX_FMT_FLAG_RGB

Definition at line 167 of file pixdesc.h.

#define PIX_FMT_PSEUDOPAL AV_PIX_FMT_FLAG_PSEUDOPAL

Definition at line 168 of file pixdesc.h.

#define PIX_FMT_ALPHA AV_PIX_FMT_FLAG_ALPHA

Definition at line 169 of file pixdesc.h.

#define FF_LOSS_RESOLUTION 0x0001

loss due to resolution change

Definition at line 323 of file pixdesc.h.

Referenced by get_pix_fmt_score().

#define FF_LOSS_DEPTH 0x0002

loss due to color depth change

Definition at line 324 of file pixdesc.h.

Referenced by get_pix_fmt_score().

#define FF_LOSS_COLORSPACE 0x0004

loss due to color space conversion

Definition at line 325 of file pixdesc.h.

Referenced by get_pix_fmt_score().

#define FF_LOSS_ALPHA 0x0008

loss of alpha bits

Definition at line 326 of file pixdesc.h.

Referenced by av_find_best_pix_fmt_of_2(), av_get_pix_fmt_loss(), and get_pix_fmt_score().

#define FF_LOSS_COLORQUANT 0x0010

loss due to color quantization

Definition at line 327 of file pixdesc.h.

Referenced by get_pix_fmt_score().

#define FF_LOSS_CHROMA 0x0020

loss of chroma (e.g.

RGB to gray conversion)

Definition at line 328 of file pixdesc.h.

Referenced by get_pix_fmt_score().

Function Documentation

void av_read_image_line	(	uint16_t *	dst,
		const uint8_t *	data[4],
		const int	linesize[4],
		const AVPixFmtDescriptor *	desc,
		int	x,
		int	y,
		int	c,
		int	w,
		int	read_pal_component
	)

Read a line from an image, and write the values of the pixel format component c to dst.

Parameters

data	the array containing the pointers to the planes of the image
linesize	the array containing the linesizes of the image
desc	the pixel format descriptor for the image
x	the horizontal coordinate of the first pixel to read
y	the vertical coordinate of the first pixel to read
w	the width of the line to read, that is the number of values to write to dst
read_pal_component	if not zero and the format is a paletted format writes the values corresponding to the palette component c in data[1] to dst, rather than the palette indexes in data[0]. The behavior is undefined if the format is not paletted.

Definition at line 34 of file pixdesc.c.

Referenced by ff_check_pixfmt_descriptors(), and filter_frame().

void av_write_image_line	(	const uint16_t *	src,
		uint8_t *	data[4],
		const int	linesize[4],
		const AVPixFmtDescriptor *	desc,
		int	x,
		int	y,
		int	c,
		int	w
	)

Write the values from src to the pixel format component c of an image line.

Parameters

src	array containing the values to write
data	the array containing the pointers to the planes of the image to write into. It is supposed to be zeroed.
linesize	the array containing the linesizes of the image
desc	the pixel format descriptor for the image
x	the horizontal coordinate of the first pixel to write
y	the vertical coordinate of the first pixel to write
w	the width of the line to write, that is the number of values to write to the image line

Definition at line 82 of file pixdesc.c.

Referenced by ff_check_pixfmt_descriptors(), and filter_frame().

enum AVPixelFormat av_get_pix_fmt ( const char * name )

Return the pixel format corresponding to name.

If there is no pixel format with name name, then looks for a pixel format with the name corresponding to the native endian format of name. For example in a little-endian system, first looks for "gray16", then for "gray16le".

Finally if no pixel format has been found, returns AV_PIX_FMT_NONE.

Definition at line 1962 of file pixdesc.c.

Referenced by dc1394_read_common(), ff_check_pixfmt_descriptors(), ff_img_read_header(), ff_parse_pixel_format(), ffserver_parse_config_stream(), fileTest(), main(), new_video_stream(), rawvideo_read_header(), set_string_pixel_fmt(), and v4l2_read_header().

const char* av_get_pix_fmt_name ( enum AVPixelFormat pix_fmt )

Return the short name for a pixel format, NULL in case pix_fmt is unknown.

See Also: av_get_pix_fmt(), av_get_pix_fmt_string()

Definition at line 1950 of file pixdesc.c.

Referenced by add_video_device(), av_opt_get(), avcodec_open2(), avcodec_string(), avi_write_header(), caca_write_header(), choose_pix_fmts(), choose_pixel_fmt(), config_input_overlay(), config_output(), config_props(), dc1394_read_common(), decode_packet(), decode_video(), device_try_init(), dnxhd_decode_frame(), dshow_cycle_formats(), dvvideo_encode_init(), event_thread(), fbdev_read_header(), fbdev_write_packet(), ff_h264_decode_slice_header(), ff_hevc_decode_nal_sps(), ff_scale_image(), ff_tlog_link(), ff_yuv2rgb_get_func_ptr(), handle_p_frame_apng(), init_video(), libopenjpeg_encode_frame(), list_formats(), main(), mj2_create_image(), mov_get_rawvideo_codec_tag(), movie_push_frame(), opengl_compile_shaders(), opt_list(), palToRgbWrapper(), pick_format(), planarRgbToRgbWrapper(), print_link_prop(), reget_buffer_internal(), rgbToPlanarRgbWrapper(), rgbToRgbWrapper(), sdl_write_header(), show_frame(), show_stream(), sws_init_context(), targa_encode_frame(), transcode_init(), video_thread(), write_header(), xv_write_header(), yuv4_write_header(), and yuv4_write_packet().

char* av_get_pix_fmt_string	(	char *	buf,
		int	buf_size,
		enum AVPixelFormat	pix_fmt
	)

Print in buf the string corresponding to the pixel format with number pix_fmt, or a header if pix_fmt is negative.

Parameters

buf	the buffer where to write the string
buf_size	the size of buf
pix_fmt	the number of the pixel format to print the corresponding info string, or a negative value to print the corresponding header.

Definition at line 2014 of file pixdesc.c.

int av_get_bits_per_pixel ( const AVPixFmtDescriptor * pixdesc )

Return the number of bits per pixel used by the pixel format described by pixdesc.

Note that this is not the same as the number of bits per sample.

The returned number of bits refers to the number of bits actually used for storing the pixel information, that is padding bits are not counted.

Definition at line 1981 of file pixdesc.c.

Referenced by av_get_pix_fmt_string(), caca_write_header(), config_input(), config_props(), decode_frame(), encode_frame(), ff_fill_line_with_color(), ffprobe_show_pixel_formats(), raw_decode(), raw_encode_init(), show_pix_fmts(), sws_init_context(), sws_setColorspaceDetails(), targa_encode_frame(), and xwd_encode_frame().

int av_get_padded_bits_per_pixel ( const AVPixFmtDescriptor * pixdesc )

Return the number of bits per pixel for the pixel format described by pixdesc, including any padding or unused bits.

Definition at line 1994 of file pixdesc.c.

Referenced by av_find_best_pix_fmt_of_2(), config_input(), config_output(), and lavfi_read_header().

const AVPixFmtDescriptor* av_pix_fmt_desc_get ( enum AVPixelFormat pix_fmt )

Returns: a pixel format descriptor for provided pixel format or NULL if this pixel format is unknown.

Definition at line 2029 of file pixdesc.c.

Referenced by av_find_best_pix_fmt_of_2(), av_image_alloc(), av_image_copy(), av_image_copy_to_buffer(), av_image_fill_linesizes(), av_image_fill_pointers(), av_image_get_buffer_size(), av_image_get_linesize(), av_picture_crop(), av_picture_pad(), av_pix_fmt_count_planes(), av_pix_fmt_get_chroma_sub_sample(), av_pix_fmt_swap_endianness(), avcodec_align_dimensions(), avcodec_align_dimensions2(), avcodec_get_chroma_sub_sample(), avcodec_string(), avpriv_color_frame(), caca_write_header(), check_image_pointers(), choose_pixel_fmt(), config_input(), config_input_main(), config_input_overlay(), config_input_ref(), config_out_props(), config_output(), config_props(), config_props_output(), copy_picture_field(), create_all_formats(), decode_frame(), decode_slice(), decode_thread(), doTest(), encode_frame(), encode_init(), encode_slice(), ff_draw_horiz_band(), ff_draw_init(), ff_draw_supported_pixel_formats(), ff_fill_line_with_color(), ff_get_format(), ff_get_unscaled_swscale(), ff_h264_draw_horiz_band(), ff_hevc_decode_nal_sps(), ff_hevc_output_frame(), ff_llviddsp_init_x86(), ff_merge_formats(), ff_mjpeg_decode_frame(), ff_mjpeg_decode_sof(), ff_opencl_deshake_process_inout_buf(), ff_parse_pixel_format(), ff_pnm_decode_header(), ff_sws_init_output_funcs(), filter_frame(), frame_end(), geq_config_props(), get_aspect_ratio(), get_buffer_internal(), get_format(), get_pix_fmt_depth(), get_pix_fmt_score(), get_video_buffer(), hScale16To15_c(), hScale16To19_c(), init(), init_image(), is16BPS(), is9_OR_10BPS(), is_hwaccel_pix_fmt(), isALPHA(), isBE(), isPackedRGB(), isPlanar(), isPlanarRGB(), isPlanarYUV(), isRGB(), isYUV(), jpeg2000_decode_tile(), lavfi_read_header(), libopenjpeg_copy_to_packed16(), libopenjpeg_copyto16(), libopenjpeg_decode_frame(), libopenjpeg_ispacked(), libopenjpeg_matches_pix_fmt(), libx265_encode_frame(), libx265_encode_init(), main(), mj2_create_image(), opengl_draw(), opengl_fill_color_map(), opengl_init_context(), output_frame(), pick_format(), pix_fmt_match(), planarCopyWrapper(), planarRgb16ToRgb16Wrapper(), pnm_encode_frame(), print_digraph(), query_formats(), raw_decode(), raw_encode_init(), raw_init_decoder(), Rgb16ToPlanarRgb16Wrapper(), rgb48Toxyz12(), rgbToRgbWrapper(), selfTest(), shuffleplanes_config_input(), smv_img_pnt(), smvjpeg_decode_frame(), sws_init_context(), sws_setColorspaceDetails(), swscale(), targa_encode_frame(), tiff_unpack_strip(), usePal(), utvideo_encode_init(), verify_md5(), video_frame_cksum(), write_header(), write_packet(), xwd_encode_frame(), xyz12Torgb48(), and yuv2gbrp_full_X_c().

const AVPixFmtDescriptor* av_pix_fmt_desc_next ( const AVPixFmtDescriptor * prev )

Iterate over all pixel format descriptors known to libavutil.

Parameters

prev	previous descriptor. NULL to get the first descriptor.

Returns: next descriptor or NULL after the last descriptor

Definition at line 2036 of file pixdesc.c.

Referenced by ff_all_formats(), ffprobe_show_pixel_formats(), init(), query_formats(), and show_pix_fmts().

enum AVPixelFormat av_pix_fmt_desc_get_id ( const AVPixFmtDescriptor * desc )

Returns: an AVPixelFormat id described by desc, or AV_PIX_FMT_NONE if desc is not a valid pointer to a pixel format descriptor.

Definition at line 2048 of file pixdesc.c.

Referenced by ff_all_formats(), init(), query_formats(), and show_pix_fmts().

int av_pix_fmt_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.

See av_get_chroma_sub_sample() for a function that asserts a valid pixel format instead of returning an error code. Its recommended that you use avcodec_get_chroma_sub_sample unless you do check the return code!

Parameters

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

Returns: 0 on success, AVERROR(ENOSYS) on invalid or unknown pixel format

Definition at line 2057 of file pixdesc.c.

Referenced by alloc_picture(), amv_encode_picture(), decode_init(), encode_frame(), encode_init(), ff_mjpeg_init_hvsample(), ff_mpv_frame_start(), gray_frame(), h264_slice_header_init(), load_input_picture(), sws_init_context(), and yuv4_write_packet().

int av_pix_fmt_count_planes ( enum AVPixelFormat pix_fmt )

Returns: number of planes in pix_fmt, a negative AVERROR if pix_fmt is not a valid pixel format.

Definition at line 2069 of file pixdesc.c.

Referenced by config_input(), config_output(), config_props(), config_props_output(), frame_copy_video(), get_buffer_internal(), init(), query_formats(), and shuffleplanes_config_input().

enum AVPixelFormat av_pix_fmt_swap_endianness ( enum AVPixelFormat pix_fmt )

Utility function to swap the endianness of a pixel format.

Parameters

[in] pix_fmt the pixel format

Returns: pixel format with swapped endianness if it exists, otherwise AV_PIX_FMT_NONE

Definition at line 2127 of file pixdesc.c.

Referenced by sws_init_context().

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

Compute what kind of losses will occur when converting from one specific pixel format to another.

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. These losses can involve loss of chroma, but also loss of resolution, loss of color depth, loss due to the color space conversion, loss of the alpha bits or loss due to color quantization. av_get_fix_fmt_loss() informs you about the various types of losses which will occur when converting from one pixel format to another.

Parameters

[in]	dst_pix_fmt	destination pixel format
[in]	src_pix_fmt	source pixel format
[in]	has_alpha	Whether the source pixel format alpha channel is used.

Returns: Combination of flags informing you what kind of losses will occur (maximum loss for an invalid dst_pix_fmt).

Definition at line 2297 of file pixdesc.c.

Referenced by av_find_best_pix_fmt_of_2(), and avcodec_get_pix_fmt_loss().

enum AVPixelFormat av_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
	)

Compute what kind of losses will occur when converting from one specific pixel format to another.

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. These losses can involve loss of chroma, but also loss of resolution, loss of color depth, loss due to the color space conversion, loss of the alpha bits or loss due to color quantization. av_get_fix_fmt_loss() informs you about the various types of losses which will occur when converting from one pixel format to another.

Parameters