FFmpeg
Macros | Functions | Variables
swscale.c File Reference
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "libavutil/avassert.h"
#include "libavutil/bswap.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/emms.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem_internal.h"
#include "libavutil/pixdesc.h"
#include "config.h"
#include "swscale_internal.h"
#include "swscale.h"

Go to the source code of this file.

Macros

#define DEBUG_SWSCALE_BUFFERS   0
 
#define DEBUG_BUFFERS(...)
 
#define RGB2YUV_SHIFT   15
 
#define BY   ( (int) (0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 
#define BV   (-(int) (0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 
#define BU   ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 
#define GY   ( (int) (0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 
#define GV   (-(int) (0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 
#define GU   (-(int) (0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 
#define RY   ( (int) (0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 
#define RV   ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 
#define RU   (-(int) (0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 

Functions

static av_always_inline void fillPlane (uint8_t *plane, int stride, int width, int height, int y, uint8_t val)
 
static void hScale16To19_c (SwsContext *c, int16_t *_dst, int dstW, const uint8_t *_src, const int16_t *filter, const int32_t *filterPos, int filterSize)
 
static void hScale16To15_c (SwsContext *c, int16_t *dst, int dstW, const uint8_t *_src, const int16_t *filter, const int32_t *filterPos, int filterSize)
 
static void hScale8To15_c (SwsContext *c, int16_t *dst, int dstW, const uint8_t *src, const int16_t *filter, const int32_t *filterPos, int filterSize)
 
static void hScale8To19_c (SwsContext *c, int16_t *_dst, int dstW, const uint8_t *src, const int16_t *filter, const int32_t *filterPos, int filterSize)
 
static void chrRangeToJpeg_c (int16_t *dstU, int16_t *dstV, int width)
 
static void chrRangeFromJpeg_c (int16_t *dstU, int16_t *dstV, int width)
 
static void lumRangeToJpeg_c (int16_t *dst, int width)
 
static void lumRangeFromJpeg_c (int16_t *dst, int width)
 
static void chrRangeToJpeg16_c (int16_t *_dstU, int16_t *_dstV, int width)
 
static void chrRangeFromJpeg16_c (int16_t *_dstU, int16_t *_dstV, int width)
 
static void lumRangeToJpeg16_c (int16_t *_dst, int width)
 
static void lumRangeFromJpeg16_c (int16_t *_dst, int width)
 
static int swscale (SwsContext *c, const uint8_t *src[], int srcStride[], int srcSliceY, int srcSliceH, uint8_t *dst[], int dstStride[], int dstSliceY, int dstSliceH)
 
av_cold void ff_sws_init_range_convert (SwsContext *c)
 
static av_cold void sws_init_swscale (SwsContext *c)
 
void ff_sws_init_scale (SwsContext *c)
 
static void reset_ptr (const uint8_t *src[], enum AVPixelFormat format)
 
static int check_image_pointers (const uint8_t *const data[4], enum AVPixelFormat pix_fmt, const int linesizes[4])
 
static void xyz12Torgb48 (struct SwsContext *c, uint16_t *dst, const uint16_t *src, int stride, int h)
 
static void rgb48Toxyz12 (struct SwsContext *c, uint16_t *dst, const uint16_t *src, int stride, int h)
 
static void update_palette (SwsContext *c, const uint32_t *pal)
 
static int scale_internal (SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dstSlice[], const int dstStride[], int dstSliceY, int dstSliceH)
 
static int scale_gamma (SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dstSlice[], const int dstStride[], int dstSliceY, int dstSliceH)
 
static int scale_cascaded (SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dstSlice[], const int dstStride[], int dstSliceY, int dstSliceH)
 
void sws_frame_end (struct SwsContext *c)
 Finish the scaling process for a pair of source/destination frames previously submitted with sws_frame_start(). More...
 
int sws_frame_start (struct SwsContext *c, AVFrame *dst, const AVFrame *src)
 Initialize the scaling process for a given pair of source/destination frames. More...
 
int sws_send_slice (struct SwsContext *c, unsigned int slice_start, unsigned int slice_height)
 Indicate that a horizontal slice of input data is available in the source frame previously provided to sws_frame_start(). More...
 
unsigned int sws_receive_slice_alignment (const struct SwsContext *c)
 Get the alignment required for slices. More...
 
int sws_receive_slice (struct SwsContext *c, unsigned int slice_start, unsigned int slice_height)
 Request a horizontal slice of the output data to be written into the frame previously provided to sws_frame_start(). More...
 
int sws_scale_frame (struct SwsContext *c, AVFrame *dst, const AVFrame *src)
 Scale source data from src and write the output to dst. More...
 
int attribute_align_arg sws_scale (struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])
 swscale wrapper, so we don't need to export the SwsContext. More...
 
void ff_sws_slice_worker (void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads)
 

Variables

const uint8_t ff_dither_8x8_128 [9][8]
 
static const uint8_t sws_pb_64 [8]
 

Macro Definition Documentation

◆ DEBUG_SWSCALE_BUFFERS

#define DEBUG_SWSCALE_BUFFERS   0

Definition at line 230 of file swscale.c.

◆ DEBUG_BUFFERS

#define DEBUG_BUFFERS (   ...)
Value:
if (DEBUG_SWSCALE_BUFFERS) \
av_log(c, AV_LOG_DEBUG, __VA_ARGS__)

Definition at line 231 of file swscale.c.

◆ RGB2YUV_SHIFT

#define RGB2YUV_SHIFT   15

◆ BY

#define BY   ( (int) (0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

◆ BV

#define BV   (-(int) (0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

◆ BU

#define BU   ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

◆ GY

#define GY   ( (int) (0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

◆ GV

#define GV   (-(int) (0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

◆ GU

#define GU   (-(int) (0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

◆ RY

#define RY   ( (int) (0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

◆ RV

#define RV   ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

◆ RU

#define RU   (-(int) (0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

Function Documentation

◆ fillPlane()

static av_always_inline void fillPlane ( uint8_t *  plane,
int  stride,
int  width,
int  height,
int  y,
uint8_t  val 
)
static

Definition at line 53 of file swscale.c.

Referenced by swscale().

◆ hScale16To19_c()

static void hScale16To19_c ( SwsContext *  c,
int16_t *  _dst,
int  dstW,
const uint8_t *  _src,
const int16_t *  filter,
const int32_t *  filterPos,
int  filterSize 
)
static

Definition at line 64 of file swscale.c.

Referenced by sws_init_swscale().

◆ hScale16To15_c()

static void hScale16To15_c ( SwsContext *  c,
int16_t *  dst,
int  dstW,
const uint8_t *  _src,
const int16_t *  filter,
const int32_t *  filterPos,
int  filterSize 
)
static

Definition at line 94 of file swscale.c.

Referenced by sws_init_swscale().

◆ hScale8To15_c()

static void hScale8To15_c ( SwsContext *  c,
int16_t *  dst,
int  dstW,
const uint8_t *  src,
const int16_t *  filter,
const int32_t *  filterPos,
int  filterSize 
)
static

Definition at line 123 of file swscale.c.

Referenced by sws_init_swscale().

◆ hScale8To19_c()

static void hScale8To19_c ( SwsContext *  c,
int16_t *  _dst,
int  dstW,
const uint8_t *  src,
const int16_t *  filter,
const int32_t *  filterPos,
int  filterSize 
)
static

Definition at line 139 of file swscale.c.

Referenced by sws_init_swscale().

◆ chrRangeToJpeg_c()

static void chrRangeToJpeg_c ( int16_t *  dstU,
int16_t *  dstV,
int  width 
)
static

Definition at line 158 of file swscale.c.

Referenced by ff_sws_init_range_convert().

◆ chrRangeFromJpeg_c()

static void chrRangeFromJpeg_c ( int16_t *  dstU,
int16_t *  dstV,
int  width 
)
static

Definition at line 167 of file swscale.c.

Referenced by ff_sws_init_range_convert().

◆ lumRangeToJpeg_c()

static void lumRangeToJpeg_c ( int16_t *  dst,
int  width 
)
static

Definition at line 176 of file swscale.c.

Referenced by ff_sws_init_range_convert().

◆ lumRangeFromJpeg_c()

static void lumRangeFromJpeg_c ( int16_t *  dst,
int  width 
)
static

Definition at line 183 of file swscale.c.

Referenced by ff_sws_init_range_convert().

◆ chrRangeToJpeg16_c()

static void chrRangeToJpeg16_c ( int16_t *  _dstU,
int16_t *  _dstV,
int  width 
)
static

Definition at line 190 of file swscale.c.

Referenced by ff_sws_init_range_convert().

◆ chrRangeFromJpeg16_c()

static void chrRangeFromJpeg16_c ( int16_t *  _dstU,
int16_t *  _dstV,
int  width 
)
static

Definition at line 201 of file swscale.c.

Referenced by ff_sws_init_range_convert().

◆ lumRangeToJpeg16_c()

static void lumRangeToJpeg16_c ( int16_t *  _dst,
int  width 
)
static

Definition at line 212 of file swscale.c.

Referenced by ff_sws_init_range_convert().

◆ lumRangeFromJpeg16_c()

static void lumRangeFromJpeg16_c ( int16_t *  _dst,
int  width 
)
static

Definition at line 221 of file swscale.c.

Referenced by ff_sws_init_range_convert().

◆ swscale()

static int swscale ( SwsContext *  c,
const uint8_t *  src[],
int  srcStride[],
int  srcSliceY,
int  srcSliceH,
uint8_t *  dst[],
int  dstStride[],
int  dstSliceY,
int  dstSliceH 
)
static

Definition at line 235 of file swscale.c.

Referenced by ffprobe_show_library_versions(), print_all_libs_info(), and scale_internal().

◆ ff_sws_init_range_convert()

av_cold void ff_sws_init_range_convert ( SwsContext *  c)

Definition at line 533 of file swscale.c.

Referenced by sws_init_swscale(), and sws_setColorspaceDetails().

◆ sws_init_swscale()

static av_cold void sws_init_swscale ( SwsContext *  c)
static

Definition at line 558 of file swscale.c.

Referenced by ff_sws_init_scale().

◆ ff_sws_init_scale()

void ff_sws_init_scale ( SwsContext *  c)

Definition at line 590 of file swscale.c.

Referenced by check_hscale(), check_input_planar_rgb_to_a(), check_input_planar_rgb_to_uv(), check_input_planar_rgb_to_y(), check_output_yuv2gbrp(), check_yuv2yuv1(), check_yuv2yuvX(), and sws_init_single_context().

◆ reset_ptr()

static void reset_ptr ( const uint8_t *  src[],
enum AVPixelFormat  format 
)
static

Definition at line 607 of file swscale.c.

Referenced by scale_internal().

◆ check_image_pointers()

static int check_image_pointers ( const uint8_t *const  data[4],
enum AVPixelFormat  pix_fmt,
const int  linesizes[4] 
)
static

Definition at line 619 of file swscale.c.

Referenced by scale_internal().

◆ xyz12Torgb48()

static void xyz12Torgb48 ( struct SwsContext *  c,
uint16_t *  dst,
const uint16_t *  src,
int  stride,
int  h 
)
static

Definition at line 636 of file swscale.c.

Referenced by scale_internal().

◆ rgb48Toxyz12()

static void rgb48Toxyz12 ( struct SwsContext *  c,
uint16_t *  dst,
const uint16_t *  src,
int  stride,
int  h 
)
static

Definition at line 692 of file swscale.c.

Referenced by scale_internal().

◆ update_palette()

static void update_palette ( SwsContext *  c,
const uint32_t *  pal 
)
static

Definition at line 748 of file swscale.c.

Referenced by reconfigure_at_keyframe(), and scale_internal().

◆ scale_internal()

static int scale_internal ( SwsContext *  c,
const uint8_t *const  srcSlice[],
const int  srcStride[],
int  srcSliceY,
int  srcSliceH,
uint8_t *const  dstSlice[],
const int  dstStride[],
int  dstSliceY,
int  dstSliceH 
)
static

Definition at line 882 of file swscale.c.

Referenced by ff_sws_slice_worker(), scale_cascaded(), scale_gamma(), sws_receive_slice(), and sws_scale().

◆ scale_gamma()

static int scale_gamma ( SwsContext *  c,
const uint8_t *const  srcSlice[],
const int  srcStride[],
int  srcSliceY,
int  srcSliceH,
uint8_t *const  dstSlice[],
const int  dstStride[],
int  dstSliceY,
int  dstSliceH 
)
static

Definition at line 829 of file swscale.c.

Referenced by scale_internal().

◆ scale_cascaded()

static int scale_cascaded ( SwsContext *  c,
const uint8_t *const  srcSlice[],
const int  srcStride[],
int  srcSliceY,
int  srcSliceH,
uint8_t *const  dstSlice[],
const int  dstStride[],
int  dstSliceY,
int  dstSliceH 
)
static

Definition at line 863 of file swscale.c.

Referenced by scale_internal().

◆ ff_sws_slice_worker()

void ff_sws_slice_worker ( void *  priv,
int  jobnr,
int  threadnr,
int  nb_jobs,
int  nb_threads 
)

Definition at line 1218 of file swscale.c.

Referenced by context_init_threaded().

Variable Documentation

◆ ff_dither_8x8_128

const uint8_t ff_dither_8x8_128[9][8]
Initial value:
= {
{ 36, 68, 60, 92, 34, 66, 58, 90, },
{ 100, 4, 124, 28, 98, 2, 122, 26, },
{ 52, 84, 44, 76, 50, 82, 42, 74, },
{ 116, 20, 108, 12, 114, 18, 106, 10, },
{ 32, 64, 56, 88, 38, 70, 62, 94, },
{ 96, 0, 120, 24, 102, 6, 126, 30, },
{ 48, 80, 40, 72, 54, 86, 46, 78, },
{ 112, 16, 104, 8, 118, 22, 110, 14, },
{ 36, 68, 60, 92, 34, 66, 58, 90, },
}

Definition at line 37 of file swscale.c.

Referenced by swscale().

◆ sws_pb_64

const uint8_t sws_pb_64[8]
static
Initial value:
= {
64, 64, 64, 64, 64, 64, 64, 64
}

Definition at line 49 of file swscale.c.

Referenced by swscale().

AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
DEBUG_SWSCALE_BUFFERS
#define DEBUG_SWSCALE_BUFFERS
Definition: swscale.c:230
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