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... | |
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... | |
#define AV_PIX_FMT_FLAG_BE (1 << 0) |
Pixel format is big-endian.
Definition at line 91 of file pixdesc.h.
Referenced by av_read_image_line(), av_write_image_line(), isBE(), and xwd_encode_frame().
#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 95 of file pixdesc.h.
Referenced by av_image_alloc(), av_image_copy(), av_image_fill_pointers(), avpicture_layout(), config_props(), encode_frame(), filter_frame(), get_video_buffer(), raw_init_decoder(), show_pix_fmts(), 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 99 of file pixdesc.h.
Referenced by av_image_fill_linesizes(), av_image_get_linesize(), av_read_image_line(), av_write_image_line(), query_formats(), and show_pix_fmts().
#define AV_PIX_FMT_FLAG_HWACCEL (1 << 3) |
Pixel format is an HW accelerated format.
Definition at line 103 of file pixdesc.h.
Referenced by av_image_copy(), av_image_fill_linesizes(), av_image_fill_pointers(), ff_all_formats(), ff_get_buffer(), get_format(), is_hwaccel_pix_fmt(), query_formats(), and show_pix_fmts().
#define AV_PIX_FMT_FLAG_PLANAR (1 << 4) |
At least one pixel component is not in the first data plane.
Definition at line 107 of file pixdesc.h.
Referenced by decode_slice(), encode_slice(), ff_pnm_decode_header(), is_yuv_planar(), isPacked(), isPackedRGB(), isPlanar(), isPlanarRGB(), and isPlanarYUV().
#define AV_PIX_FMT_FLAG_RGB (1 << 5) |
The pixel format contains RGB-like data (as opposed to YUV/grayscale).
Definition at line 111 of file pixdesc.h.
Referenced by avcodec_get_pix_fmt_loss(), encode_frame(), is_yuv_planar(), isPackedRGB(), isPlanarRGB(), isRGB(), and isYUV().
#define AV_PIX_FMT_FLAG_PSEUDOPAL (1 << 6) |
The pixel format is "pseudo-paletted".
This means that Libav treats it as paletted internally, but the palette is generated by the decoder and is not stored in the file.
Definition at line 117 of file pixdesc.h.
Referenced by av_image_alloc(), av_image_copy(), av_image_fill_pointers(), avpicture_get_size(), config_props(), filter_frame(), get_video_buffer(), raw_decode(), raw_init_decoder(), and usePal().
#define AV_PIX_FMT_FLAG_ALPHA (1 << 7) |
The pixel format has an alpha channel.
Definition at line 121 of file pixdesc.h.
Referenced by avcodec_get_pix_fmt_loss(), encode_init(), and is_gray().
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. |
Definition at line 32 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.
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 80 of file pixdesc.c.
Referenced by 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 PIX_FMT_NONE.
Definition at line 1461 of file pixdesc.c.
Referenced by dc1394_read_common(), fileTest(), img_read_header(), init(), init_video(), main(), new_video_stream(), rawvideo_read_header(), 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.
Definition at line 1449 of file pixdesc.c.
Referenced by avcodec_string(), config_input_overlay(), config_props(), dc1394_read_common(), decode_video(), dvvideo_init_encoder(), fbdev_read_header(), ff_dlog_link(), ff_dv_print_profiles(), ff_hevc_decode_nal_sps(), init_video(), libopenjpeg_create_image(), libopenjpeg_encode_frame(), list_formats(), main(), planarRgbToRgbWrapper(), rgbToPlanarRgbWrapper(), sws_init_context(), and targa_encode_frame().
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 1480 of file pixdesc.c.
Referenced by av_get_pix_fmt_string(), avcodec_find_best_pix_fmt1(), config_props(), encode_frame(), ff_fill_line_with_color(), raw_init_encoder(), show_pix_fmts(), sws_init_context(), sws_setColorspaceDetails(), and xwd_encode_frame().
const AVPixFmtDescriptor* av_pix_fmt_desc_get | ( | enum AVPixelFormat | pix_fmt | ) |
Definition at line 1507 of file pixdesc.c.
Referenced by av_image_alloc(), av_image_copy(), av_image_fill_linesizes(), av_image_fill_pointers(), av_image_get_linesize(), av_picture_crop(), av_picture_pad(), av_pix_fmt_count_planes(), av_pix_fmt_get_chroma_sub_sample(), avcodec_align_dimensions(), avcodec_find_best_pix_fmt1(), avcodec_get_chroma_sub_sample(), avcodec_get_pix_fmt_loss(), avpicture_get_size(), avpicture_layout(), check_image_pointers(), color_config_props(), config_input(), config_input_main(), config_output(), config_props(), config_props_output(), copy_picture_field(), decode_slice(), doTest(), encode_frame(), encode_init(), encode_slice(), ff_all_formats(), ff_draw_horiz_band(), ff_fill_line_with_color(), ff_get_buffer(), ff_get_unscaled_swscale(), ff_h264_draw_horiz_band(), ff_hevc_decode_nal_sps(), ff_hevc_output_frame(), ff_mjpeg_decode_sof(), ff_pnm_decode_header(), ff_sws_init_output_funcs(), ffv1_encode_init(), filter_frame(), findRgbConvFn(), frame_end(), get_aspect_ratio(), get_format(), get_video_buffer(), getSubSampleFactors(), hScale16To15_c(), hScale16To19_c(), is16BPS(), is9_OR_10BPS(), is_hwaccel_pix_fmt(), isALPHA(), isBE(), isPacked(), isPackedRGB(), isPlanar(), isPlanarRGB(), isPlanarYUV(), isRGB(), isYUV(), libopenjpeg_create_image(), libopenjpeg_decode_frame(), libopenjpeg_ispacked(), libopenjpeg_matches_pix_fmt(), planarCopyWrapper(), pnm_encode_frame(), print_digraph(), query_formats(), raw_decode(), raw_init_decoder(), raw_init_encoder(), selfTest(), show_stream(), sws_format_name(), sws_init_context(), sws_setColorspaceDetails(), swscale(), usePal(), utvideo_encode_init(), verify_md5(), video_get_buffer(), xwd_encode_frame(), and yuv2gbrp_full_X_c().
const AVPixFmtDescriptor* av_pix_fmt_desc_next | ( | const AVPixFmtDescriptor * | prev | ) |
Iterate over all pixel format descriptors known to libavutil.
prev | previous descriptor. NULL to get the first descriptor. |
Definition at line 1514 of file pixdesc.c.
Referenced by show_pix_fmts().
enum AVPixelFormat av_pix_fmt_desc_get_id | ( | const AVPixFmtDescriptor * | desc | ) |
Definition at line 1523 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.
[in] | pix_fmt | the pixel format |
[out] | h_shift | store log2_chroma_h |
[out] | v_shift | store log2_chroma_w |
Definition at line 1533 of file pixdesc.c.
Referenced by encode_frame(), encode_init(), ff_mjpeg_encode_picture_header(), ff_MPV_common_init(), ff_MPV_frame_start(), ffv1_encode_init(), h264_slice_header_init(), ljpeg_encode_init(), load_input_picture(), video_get_buffer(), and vp3_decode_init().
int av_pix_fmt_count_planes | ( | enum AVPixelFormat | pix_fmt | ) |
Definition at line 1545 of file pixdesc.c.
Referenced by ff_get_buffer().
enum AVPixelFormat av_pix_fmt_swap_endianness | ( | enum AVPixelFormat | pix_fmt | ) |
Utility function to swap the endianness of a pixel format.
[in] | pix_fmt | the pixel format |
Definition at line 1561 of file pixdesc.c.
Referenced by sws_init_context().