Libav
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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. More... | |
#define | AV_PIX_FMT_FLAG_PAL (1 << 1) |
Pixel format has a palette in data[1], values are indexes in this palette. More... | |
#define | AV_PIX_FMT_FLAG_BITSTREAM (1 << 2) |
All values of a component are bit-wise packed end to end. More... | |
#define | AV_PIX_FMT_FLAG_HWACCEL (1 << 3) |
Pixel format is an HW accelerated format. More... | |
#define | AV_PIX_FMT_FLAG_PLANAR (1 << 4) |
At least one pixel component is not in the first data plane. More... | |
#define | AV_PIX_FMT_FLAG_RGB (1 << 5) |
The pixel format contains RGB-like data (as opposed to YUV/grayscale). More... | |
#define | AV_PIX_FMT_FLAG_PSEUDOPAL (1 << 6) |
The pixel format is "pseudo-paletted". More... | |
#define | AV_PIX_FMT_FLAG_ALPHA (1 << 7) |
The pixel format has an alpha channel. More... | |
#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 |
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. More... | |
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. More... | |
enum AVPixelFormat | av_get_pix_fmt (const char *name) |
Return the pixel format corresponding to name. More... | |
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. More... | |
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. More... | |
int | av_get_bits_per_pixel (const AVPixFmtDescriptor *pixdesc) |
Return the number of bits per pixel used by the pixel format described by pixdesc. More... | |
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. More... | |
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. More... | |
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. More... | |
Variables | |
attribute_deprecated const AVPixFmtDescriptor | av_pix_fmt_descriptors [] |
The array of all the pixel format descriptors. More... | |
#define AV_PIX_FMT_FLAG_BE (1 << 0) |
#define AV_PIX_FMT_FLAG_PAL (1 << 1) |
#define AV_PIX_FMT_FLAG_BITSTREAM (1 << 2) |
#define AV_PIX_FMT_FLAG_HWACCEL (1 << 3) |
#define AV_PIX_FMT_FLAG_PLANAR (1 << 4) |
#define AV_PIX_FMT_FLAG_RGB (1 << 5) |
#define AV_PIX_FMT_FLAG_PSEUDOPAL (1 << 6) |
#define AV_PIX_FMT_FLAG_ALPHA (1 << 7) |
#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 |
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.
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. |
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.
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 |
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 PIX_FMT_NONE.
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 an header if pix_fmt is negative.
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. |
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 1571 of file pixdesc.c.
Referenced by av_get_pix_fmt_string().
const AVPixFmtDescriptor* av_pix_fmt_desc_get | ( | enum AVPixelFormat | pix_fmt | ) |
Definition at line 1599 of file pixdesc.c.
Referenced by av_pix_fmt_count_planes(), and av_pix_fmt_get_chroma_sub_sample().
const AVPixFmtDescriptor* av_pix_fmt_desc_next | ( | const AVPixFmtDescriptor * | prev | ) |
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.
[in] | pix_fmt | the pixel format |
[out] | h_shift | store log2_chroma_h |
[out] | v_shift | store log2_chroma_w |
int av_pix_fmt_count_planes | ( | enum AVPixelFormat | pix_fmt | ) |
enum AVPixelFormat av_pix_fmt_swap_endianness | ( | enum AVPixelFormat | pix_fmt | ) |
attribute_deprecated const AVPixFmtDescriptor av_pix_fmt_descriptors[] |
The array of all the pixel format descriptors.
Definition at line 132 of file pixdesc.c.
Referenced by av_pix_fmt_desc_get_id().