misc image conversion routines More...
#include "avcodec.h"
#include "dsputil.h"
#include "internal.h"
#include "imgconvert.h"
#include "libavutil/colorspace.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
Go to the source code of this file.
Data Structures | |
struct | PixFmtInfo |
Macros | |
#define | FF_COLOR_RGB 0 |
RGB color space. | |
#define | FF_COLOR_GRAY 1 |
gray color space | |
#define | FF_COLOR_YUV 2 |
YUV color space. | |
#define | FF_COLOR_YUV_JPEG 3 |
YUV color space. | |
#define | FF_PIXEL_PLANAR 0 |
each channel has one component in AVPicture | |
#define | FF_PIXEL_PACKED 1 |
only one components containing all the channels | |
#define | FF_PIXEL_PALETTE 2 |
one components containing indexes for a palette | |
#define | deinterlace_line_inplace deinterlace_line_inplace_c |
#define | deinterlace_line deinterlace_line_c |
Typedefs | |
typedef struct PixFmtInfo | PixFmtInfo |
Functions | |
void | avcodec_get_chroma_sub_sample (enum PixelFormat pix_fmt, int *h_shift, int *v_shift) |
int | ff_is_hwaccel_pix_fmt (enum PixelFormat pix_fmt) |
Determine whether pix_fmt is a hardware accelerated format. | |
int | avpicture_fill (AVPicture *picture, uint8_t *ptr, enum PixelFormat pix_fmt, int width, int height) |
Fill in the AVPicture fields. | |
int | avpicture_layout (const AVPicture *src, enum PixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size) |
Copy pixel data from an AVPicture into a buffer. | |
int | avpicture_get_size (enum PixelFormat pix_fmt, int width, int height) |
Calculate the size in bytes that a picture of the given width and height would occupy if stored in the given picture format. | |
int | avcodec_get_pix_fmt_loss (enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt, int has_alpha) |
Compute what kind of losses will occur when converting from one specific pixel format to another. | |
static int | avg_bits_per_pixel (enum PixelFormat pix_fmt) |
static enum PixelFormat | avcodec_find_best_pix_fmt1 (int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt, int has_alpha, int loss_mask) |
enum PixelFormat | avcodec_find_best_pix_fmt (int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr) |
Find the best pixel format to convert to given a certain source pixel format. | |
void | av_picture_copy (AVPicture *dst, const AVPicture *src, enum PixelFormat pix_fmt, int width, int height) |
Copy image src to dst. | |
void | ff_shrink22 (uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height) |
void | ff_shrink44 (uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height) |
void | ff_shrink88 (uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height) |
int | avpicture_alloc (AVPicture *picture, enum PixelFormat pix_fmt, int width, int height) |
Allocate memory for a picture. | |
void | avpicture_free (AVPicture *picture) |
Free a picture previously allocated by avpicture_alloc(). | |
static int | is_yuv_planar (const PixFmtInfo *ps) |
int | av_picture_crop (AVPicture *dst, const AVPicture *src, enum PixelFormat pix_fmt, int top_band, int left_band) |
Crop image top and left side. | |
int | av_picture_pad (AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color) |
Pad image. | |
static void | deinterlace_line_c (uint8_t *dst, const uint8_t *lum_m4, const uint8_t *lum_m3, const uint8_t *lum_m2, const uint8_t *lum_m1, const uint8_t *lum, int size) |
static void | deinterlace_line_inplace_c (uint8_t *lum_m4, uint8_t *lum_m3, uint8_t *lum_m2, uint8_t *lum_m1, uint8_t *lum, int size) |
static void | deinterlace_bottom_field (uint8_t *dst, int dst_wrap, const uint8_t *src1, int src_wrap, int width, int height) |
static void | deinterlace_bottom_field_inplace (uint8_t *src1, int src_wrap, int width, int height) |
int | avpicture_deinterlace (AVPicture *dst, const AVPicture *src, enum PixelFormat pix_fmt, int width, int height) |
Variables | |
static const PixFmtInfo | pix_fmt_info [PIX_FMT_NB] |
misc image conversion routines
Definition in file imgconvert.c.
#define deinterlace_line deinterlace_line_c |
Definition at line 59 of file imgconvert.c.
Referenced by deinterlace_bottom_field().
#define deinterlace_line_inplace deinterlace_line_inplace_c |
Definition at line 58 of file imgconvert.c.
Referenced by deinterlace_bottom_field_inplace().
#define FF_COLOR_GRAY 1 |
gray color space
Definition at line 46 of file imgconvert.c.
Referenced by avcodec_get_pix_fmt_loss().
#define FF_COLOR_RGB 0 |
RGB color space.
Definition at line 45 of file imgconvert.c.
Referenced by avcodec_get_pix_fmt_loss().
#define FF_COLOR_YUV 2 |
YUV color space.
16 <= Y <= 235, 16 <= U, V <= 240
Definition at line 47 of file imgconvert.c.
Referenced by avcodec_get_pix_fmt_loss(), and is_yuv_planar().
#define FF_COLOR_YUV_JPEG 3 |
YUV color space.
0 <= Y <= 255, 0 <= U, V <= 255
Definition at line 48 of file imgconvert.c.
Referenced by avcodec_get_pix_fmt_loss(), and is_yuv_planar().
#define FF_PIXEL_PACKED 1 |
only one components containing all the channels
Definition at line 51 of file imgconvert.c.
Referenced by avg_bits_per_pixel().
#define FF_PIXEL_PALETTE 2 |
one components containing indexes for a palette
Definition at line 52 of file imgconvert.c.
Referenced by avcodec_get_pix_fmt_loss(), and avg_bits_per_pixel().
#define FF_PIXEL_PLANAR 0 |
each channel has one component in AVPicture
Definition at line 50 of file imgconvert.c.
Referenced by avg_bits_per_pixel(), and is_yuv_planar().
typedef struct PixFmtInfo PixFmtInfo |
void av_picture_copy | ( | AVPicture * | dst, |
const AVPicture * | src, | ||
enum PixelFormat | pix_fmt, | ||
int | width, | ||
int | height | ||
) |
Copy image src to dst.
Wraps av_picture_data_copy() above.
Definition at line 664 of file imgconvert.c.
Referenced by avcodec_default_reget_buffer(), copy_frame(), qtrle_encode_frame(), queue_picture(), and roq_decode_frame().
int av_picture_crop | ( | AVPicture * | dst, |
const AVPicture * | src, | ||
enum PixelFormat | pix_fmt, | ||
int | top_band, | ||
int | left_band | ||
) |
Crop image top and left side.
Definition at line 784 of file imgconvert.c.
int av_picture_pad | ( | AVPicture * | dst, |
const AVPicture * | src, | ||
int | height, | ||
int | width, | ||
enum PixelFormat | pix_fmt, | ||
int | padtop, | ||
int | padbottom, | ||
int | padleft, | ||
int | padright, | ||
int * | color | ||
) |
Pad image.
Definition at line 806 of file imgconvert.c.
enum PixelFormat avcodec_find_best_pix_fmt | ( | int64_t | pix_fmt_mask, |
enum PixelFormat | 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() 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_mask parameter.
[in] | pix_fmt_mask | bitmask determining which pixel format to choose from |
[in] | src_pix_fmt | source pixel format |
[in] | has_alpha | Whether the source pixel format alpha channel is used. |
[out] | loss_ptr | Combination of flags informing you what kind of losses will occur. |
Definition at line 631 of file imgconvert.c.
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Definition at line 604 of file imgconvert.c.
Referenced by avcodec_find_best_pix_fmt().
void avcodec_get_chroma_sub_sample | ( | enum PixelFormat | pix_fmt, |
int * | h_shift, | ||
int * | v_shift | ||
) |
Definition at line 411 of file imgconvert.c.
Referenced by alloc_buffer(), encode_init(), ff_print_debug_info(), load_input_picture(), MPV_common_init(), MPV_encode_init(), video_get_buffer(), and vp3_decode_init().
int avcodec_get_pix_fmt_loss | ( | enum PixelFormat | dst_pix_fmt, |
enum PixelFormat | 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. avcodec_get_fix_fmt_loss() informs you about the various types of losses which will occur when converting from one pixel format to another.
[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. |
Definition at line 493 of file imgconvert.c.
Referenced by avcodec_find_best_pix_fmt(), and avcodec_find_best_pix_fmt1().
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Definition at line 552 of file imgconvert.c.
Referenced by avcodec_find_best_pix_fmt1().
int avpicture_alloc | ( | AVPicture * | picture, |
enum PixelFormat | pix_fmt, | ||
int | width, | ||
int | height | ||
) |
Allocate memory for a picture.
Call avpicture_free() to free it.
picture | the picture to be filled in |
pix_fmt | the format of the picture |
width | the width of the picture |
height | the height of the picture |
Definition at line 758 of file imgconvert.c.
Referenced by ff_create_schro_frame(), libschroedinger_handle_first_access_unit(), qtrle_encode_init(), transcode(), and transcode_init().
int avpicture_deinterlace | ( | AVPicture * | dst, |
const AVPicture * | src, | ||
enum PixelFormat | pix_fmt, | ||
int | width, | ||
int | height | ||
) |
Definition at line 1023 of file imgconvert.c.
Referenced by pre_process_video_frame().
int avpicture_fill | ( | AVPicture * | picture, |
uint8_t * | ptr, | ||
enum PixelFormat | pix_fmt, | ||
int | width, | ||
int | height | ||
) |
Fill in the AVPicture fields.
The fields of the given AVPicture are filled in by using the 'ptr' address which points to the image data buffer. Depending on the specified picture format, one or multiple image data pointers and line sizes will be set. If a planar format is specified, several pointers will be set pointing to the different picture planes and the line sizes of the different planes will be stored in the lines_sizes array. Call with ptr == NULL to get the required size for the ptr buffer.
To allocate the buffer and fill in the AVPicture fields in one call, use avpicture_alloc().
picture | AVPicture whose fields are to be filled in |
ptr | Buffer which will contain or contains the actual image data |
pix_fmt | The format in which the picture data is stored. |
width | the width of the image in pixels |
height | the height of the image in pixels |
Definition at line 429 of file imgconvert.c.
Referenced by alloc_picture(), avpicture_get_size(), copy_frame(), libdirac_decode_frame(), libschroedinger_decode_frame(), pre_process_video_frame(), and raw_decode().
Free a picture previously allocated by avpicture_alloc().
The data buffer used by the AVPicture is freed, but the AVPicture structure itself is not.
picture | the AVPicture to be freed |
Definition at line 771 of file imgconvert.c.
Referenced by FreeSchroFrame(), libschroedinger_decode_close(), and qtrle_encode_end().
int avpicture_get_size | ( | enum PixelFormat | pix_fmt, |
int | width, | ||
int | height | ||
) |
Calculate the size in bytes that a picture of the given width and height would occupy if stored in the given picture format.
Note that this returns the size of a compact representation as generated by avpicture_layout(), which can be smaller than the size required for e.g. avpicture_fill().
pix_fmt | the given picture format |
width | the width of the image |
height | the height of the image |
Definition at line 476 of file imgconvert.c.
Referenced by alloc_picture(), avpicture_layout(), dc1394_read_common(), libdirac_decode_frame(), libdirac_encode_init(), libschroedinger_encode_init(), pam_encode_frame(), pnm_encode_frame(), pnm_parse(), pre_process_video_frame(), raw_init_decoder(), rawvideo_read_packet(), targa_encode_frame(), v4l2_read_header(), vble_decode_init(), and yuv4_read_packet().
int avpicture_layout | ( | const AVPicture * | src, |
enum PixelFormat | pix_fmt, | ||
int | width, | ||
int | height, | ||
unsigned char * | dest, | ||
int | dest_size | ||
) |
Copy pixel data from an AVPicture into a buffer.
The data is stored compactly, without any gaps for alignment or padding which may be applied by avpicture_fill().
[in] | src | AVPicture containing image data |
[in] | pix_fmt | The format in which the picture data is stored. |
[in] | width | the width of the image in pixels. |
[in] | height | the height of the image in pixels. |
[out] | dest | A buffer into which picture data will be copied. |
[in] | dest_size | The size of 'dest'. |
Definition at line 443 of file imgconvert.c.
Referenced by encode_frame(), libdirac_encode_frame(), libschroedinger_frame_from_data(), and raw_encode().
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Definition at line 969 of file imgconvert.c.
Referenced by avpicture_deinterlace().
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Definition at line 998 of file imgconvert.c.
Referenced by avpicture_deinterlace().
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Definition at line 917 of file imgconvert.c.
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Definition at line 942 of file imgconvert.c.
int ff_is_hwaccel_pix_fmt | ( | enum PixelFormat | pix_fmt | ) |
Determine whether pix_fmt is a hardware accelerated format.
Definition at line 424 of file imgconvert.c.
Referenced by avcodec_default_get_format().
void ff_shrink22 | ( | uint8_t * | dst, |
int | dst_wrap, | ||
const uint8_t * | src, | ||
int | src_wrap, | ||
int | width, | ||
int | height | ||
) |
Definition at line 672 of file imgconvert.c.
Referenced by dsputil_init().
void ff_shrink44 | ( | uint8_t * | dst, |
int | dst_wrap, | ||
const uint8_t * | src, | ||
int | src_wrap, | ||
int | width, | ||
int | height | ||
) |
Definition at line 705 of file imgconvert.c.
Referenced by dsputil_init().
void ff_shrink88 | ( | uint8_t * | dst, |
int | dst_wrap, | ||
const uint8_t * | src, | ||
int | src_wrap, | ||
int | width, | ||
int | height | ||
) |
Definition at line 736 of file imgconvert.c.
Referenced by dsputil_init().
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Definition at line 777 of file imgconvert.c.
Referenced by av_picture_crop(), and av_picture_pad().
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Definition at line 71 of file imgconvert.c.