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pixdesc.c File Reference
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "pixfmt.h"
#include "pixdesc.h"
#include "intreadwrite.h"

Go to the source code of this file.

Macros

#define X_NE(be, le)   le
 

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.
 
static enum AVPixelFormat get_pix_fmt_internal (const char *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.
 
enum AVPixelFormat av_get_pix_fmt (const char *name)
 Return the pixel format corresponding to name.
 
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.
 
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 an header if pix_fmt is negative.
 
const AVPixFmtDescriptorav_pix_fmt_desc_get (enum AVPixelFormat pix_fmt)
 
const AVPixFmtDescriptorav_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.
 

Variables

const AVPixFmtDescriptor av_pix_fmt_descriptors [AV_PIX_FMT_NB]
 

Macro Definition Documentation

#define X_NE (   be,
  le 
)    le

Definition at line 1680 of file pixdesc.c.

Referenced by av_get_pix_fmt().

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
datathe array containing the pointers to the planes of the image
linesizethe array containing the linesizes of the image
descthe pixel format descriptor for the image
xthe horizontal coordinate of the first pixel to read
ythe vertical coordinate of the first pixel to read
wthe width of the line to read, that is the number of values to write to dst
read_pal_componentif 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 31 of file pixdesc.c.

Referenced by 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
srcarray containing the values to write
datathe array containing the pointers to the planes of the image to write into. It is supposed to be zeroed.
linesizethe array containing the linesizes of the image
descthe pixel format descriptor for the image
xthe horizontal coordinate of the first pixel to write
ythe vertical coordinate of the first pixel to write
wthe width of the line to write, that is the number of values to write to the image line

Definition at line 79 of file pixdesc.c.

Referenced by filter_frame().

static enum AVPixelFormat get_pix_fmt_internal ( const char *  name)
static

Definition at line 1659 of file pixdesc.c.

Referenced by av_get_pix_fmt().

const char* av_get_pix_fmt_name ( enum AVPixelFormat  pix_fmt)
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 1683 of file pixdesc.c.

Referenced by av_opt_set(), dc1394_read_common(), ff_parse_pixel_format(), fileTest(), img_read_header(), main(), new_video_stream(), rawvideo_read_header(), and v4l2_read_header().

int av_get_bits_per_pixel ( const AVPixFmtDescriptor pixdesc)

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

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 1702 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(), raw_init_encoder(), 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 1715 of file pixdesc.c.

Referenced by avcodec_find_best_pix_fmt_of_2().

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 an header if pix_fmt is negative.

Parameters
bufthe buffer where to write the string
buf_sizethe size of buf
pix_fmtthe number of the pixel format to print the corresponding info string, or a negative value to print the corresponding header.

Definition at line 1735 of file pixdesc.c.

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 1749 of file pixdesc.c.

Referenced by alloc_buffer(), 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_get_chroma_sub_sample(), avcodec_align_dimensions(), avcodec_find_best_pix_fmt_of_2(), avcodec_get_chroma_sub_sample(), avcodec_get_pix_fmt_loss(), avcodec_string(), caca_write_header(), check_image_pointers(), choose_pixel_fmt(), config_input(), config_input_main(), config_input_overlay(), config_out_props(), 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_all_formats(), ff_draw_horiz_band(), ff_draw_init(), ff_fill_line_with_color(), ff_MPV_frame_end(), ff_sws_init_output_funcs(), filter_frame(), geq_config_props(), get_pix_fmt_depth(), getSubSampleFactors(), hScale16To15_c(), hScale16To19_c(), is16BPS(), is9_OR_10BPS(), is_hwaccel_pix_fmt(), isALPHA(), isBE(), isPackedRGB(), isPlanar(), isPlanarRGB(), isPlanarYUV(), isRGB(), isYUV(), libopenjpeg_decode_frame(), libopenjpeg_ispacked(), libopenjpeg_matches_pix_fmt(), main(), mj2_create_image(), pick_format(), planarCopyWrapper(), print_digraph(), query_formats(), raw_decode(), raw_init_encoder(), return_frame(), rgbToRgbWrapper(), selfTest(), sws_format_name(), sws_init_context(), sws_setColorspaceDetails(), swScale(), targa_encode_frame(), usePal(), video_get_buffer(), write_header(), write_packet(), and xwd_encode_frame().

const AVPixFmtDescriptor* av_pix_fmt_desc_next ( const AVPixFmtDescriptor prev)

Iterate over all pixel format descriptors known to libavutil.

Parameters
prevprevious descriptor. NULL to get the first descriptor.
Returns
next descriptor or NULL after the last descriptor

Definition at line 1756 of file pixdesc.c.

Referenced by 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 1768 of file pixdesc.c.

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

Parameters
[in]pix_fmtthe pixel format
[out]h_shiftstore log2_chroma_h
[out]v_shiftstore log2_chroma_w
Returns
0 on success, AVERROR(ENOSYS) on invalid or unknown pixel format

Definition at line 1777 of file pixdesc.c.

Referenced by video_get_buffer().

Variable Documentation

const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB]

Definition at line 130 of file pixdesc.c.

Referenced by av_pix_fmt_desc_get_id().