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Data Structures | Macros | Functions | Variables
pngenc.c File Reference
#include "avcodec.h"
#include "internal.h"
#include "bytestream.h"
#include "huffyuvencdsp.h"
#include "png.h"
#include "apng.h"
#include "libavutil/avassert.h"
#include "libavutil/crc.h"
#include "libavutil/libm.h"
#include "libavutil/opt.h"
#include "libavutil/color_utils.h"
#include <zlib.h>

Go to the source code of this file.

Data Structures

struct  APNGFctlChunk
 
struct  PNGEncContext
 

Macros

#define IOBUF_SIZE   4096
 
#define AV_WB32_PNG(buf, n)   AV_WB32(buf, lrint((n) * 100000))
 
#define OFFSET(x)   offsetof(PNGEncContext, x)
 
#define VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 

Functions

static void png_get_interlaced_row (uint8_t *dst, int row_size, int bits_per_pixel, int pass, const uint8_t *src, int width)
 
static void sub_png_paeth_prediction (uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
 
static void sub_left_prediction (PNGEncContext *c, uint8_t *dst, const uint8_t *src, int bpp, int size)
 
static void png_filter_row (PNGEncContext *c, uint8_t *dst, int filter_type, uint8_t *src, uint8_t *top, int size, int bpp)
 
static uint8_t * png_choose_filter (PNGEncContext *s, uint8_t *dst, uint8_t *src, uint8_t *top, int size, int bpp)
 
static void png_write_chunk (uint8_t **f, uint32_t tag, const uint8_t *buf, int length)
 
static void png_write_image_data (AVCodecContext *avctx, const uint8_t *buf, int length)
 
static int png_write_row (AVCodecContext *avctx, const uint8_t *data, int size)
 
static int png_get_chrm (enum AVColorPrimaries prim, uint8_t *buf)
 
static int png_get_gama (enum AVColorTransferCharacteristic trc, uint8_t *buf)
 
static int encode_headers (AVCodecContext *avctx, const AVFrame *pict)
 
static int encode_frame (AVCodecContext *avctx, const AVFrame *pict)
 
static int encode_png (AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
 
static int apng_do_inverse_blend (AVFrame *output, const AVFrame *input, APNGFctlChunk *fctl_chunk, uint8_t bpp)
 
static int apng_encode_frame (AVCodecContext *avctx, const AVFrame *pict, APNGFctlChunk *best_fctl_chunk, APNGFctlChunk *best_last_fctl_chunk)
 
static int encode_apng (AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
 
static av_cold int png_enc_init (AVCodecContext *avctx)
 
static av_cold int png_enc_close (AVCodecContext *avctx)
 

Variables

static const AVOption options []
 
static const AVClass pngenc_class
 
static const AVClass apngenc_class
 
AVCodec ff_png_encoder
 
AVCodec ff_apng_encoder
 

Macro Definition Documentation

#define IOBUF_SIZE   4096

Definition at line 37 of file pngenc.c.

Referenced by encode_apng(), encode_frame(), encode_png(), and png_write_row().

#define AV_WB32_PNG (   buf,
  n 
)    AV_WB32(buf, lrint((n) * 100000))

Definition at line 288 of file pngenc.c.

Referenced by png_get_chrm(), and png_get_gama().

#define OFFSET (   x)    offsetof(PNGEncContext, x)

Definition at line 1066 of file pngenc.c.

#define VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 1067 of file pngenc.c.

Function Documentation

static void png_get_interlaced_row ( uint8_t *  dst,
int  row_size,
int  bits_per_pixel,
int  pass,
const uint8_t *  src,
int  width 
)
static

Definition at line 78 of file pngenc.c.

Referenced by encode_frame().

static void sub_png_paeth_prediction ( uint8_t *  dst,
uint8_t *  src,
uint8_t *  top,
int  w,
int  bpp 
)
static

Definition at line 117 of file pngenc.c.

Referenced by png_filter_row().

static void sub_left_prediction ( PNGEncContext *  c,
uint8_t *  dst,
const uint8_t *  src,
int  bpp,
int  size 
)
static

Definition at line 145 of file pngenc.c.

Referenced by png_filter_row().

static void png_filter_row ( PNGEncContext *  c,
uint8_t *  dst,
int  filter_type,
uint8_t *  src,
uint8_t *  top,
int  size,
int  bpp 
)
static

Definition at line 161 of file pngenc.c.

Referenced by png_choose_filter().

static uint8_t* png_choose_filter ( PNGEncContext *  s,
uint8_t *  dst,
uint8_t *  src,
uint8_t *  top,
int  size,
int  bpp 
)
static

Definition at line 190 of file pngenc.c.

Referenced by encode_frame().

static void png_write_chunk ( uint8_t **  f,
uint32_t  tag,
const uint8_t *  buf,
int  length 
)
static

Definition at line 220 of file pngenc.c.

Referenced by encode_apng(), encode_headers(), encode_png(), and png_write_image_data().

static void png_write_image_data ( AVCodecContext *  avctx,
const uint8_t *  buf,
int  length 
)
static

Definition at line 239 of file pngenc.c.

Referenced by encode_frame(), and png_write_row().

static int png_write_row ( AVCodecContext *  avctx,
const uint8_t *  data,
int  size 
)
static

Definition at line 267 of file pngenc.c.

Referenced by encode_frame().

static int png_get_chrm ( enum AVColorPrimaries  prim,
uint8_t *  buf 
)
static

Definition at line 289 of file pngenc.c.

Referenced by encode_headers().

static int png_get_gama ( enum AVColorTransferCharacteristic  trc,
uint8_t *  buf 
)
static

Definition at line 331 of file pngenc.c.

Referenced by encode_headers().

static int encode_headers ( AVCodecContext *  avctx,
const AVFrame *  pict 
)
static

Definition at line 341 of file pngenc.c.

Referenced by encode_apng(), and encode_png().

static int encode_frame ( AVCodecContext *  avctx,
const AVFrame *  pict 
)
static

Definition at line 409 of file pngenc.c.

Referenced by apng_encode_frame(), and encode_png().

static int encode_png ( AVCodecContext *  avctx,
AVPacket *  pkt,
const AVFrame *  pict,
int *  got_packet 
)
static

Definition at line 502 of file pngenc.c.

static int apng_do_inverse_blend ( AVFrame *  output,
const AVFrame *  input,
APNGFctlChunk *  fctl_chunk,
uint8_t  bpp 
)
static

Definition at line 547 of file pngenc.c.

Referenced by apng_encode_frame().

static int apng_encode_frame ( AVCodecContext *  avctx,
const AVFrame *  pict,
APNGFctlChunk *  best_fctl_chunk,
APNGFctlChunk *  best_last_fctl_chunk 
)
static

Definition at line 690 of file pngenc.c.

Referenced by encode_apng().

static int encode_apng ( AVCodecContext *  avctx,
AVPacket *  pkt,
const AVFrame *  pict,
int *  got_packet 
)
static

Definition at line 813 of file pngenc.c.

static av_cold int png_enc_init ( AVCodecContext *  avctx)
static

Definition at line 952 of file pngenc.c.

static av_cold int png_enc_close ( AVCodecContext *  avctx)
static

Definition at line 1055 of file pngenc.c.

Variable Documentation

const AVOption options[]
static
Initial value:
= {
{"dpi", "Set image resolution (in dots per inch)", OFFSET(dpi), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
{"dpm", "Set image resolution (in dots per meter)", OFFSET(dpm), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
{ NULL }
}
NULL
#define NULL
Definition: coverity.c:32
AV_OPT_TYPE_INT
Definition: opt.h:223
OFFSET
#define OFFSET(x)
Definition: pngenc.c:1066
VE
#define VE
Definition: pngenc.c:1067

Definition at line 1068 of file pngenc.c.

const AVClass pngenc_class
static
Initial value:
= {
.class_name = "PNG encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
}
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
av_default_item_name
av_default_item_name
Definition: libopenh264enc.c:59
options
static const AVOption options[]
Definition: pngenc.c:1068

Definition at line 1074 of file pngenc.c.

const AVClass apngenc_class
static
Initial value:
= {
.class_name = "APNG encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
}
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
av_default_item_name
av_default_item_name
Definition: libopenh264enc.c:59
options
static const AVOption options[]
Definition: pngenc.c:1068

Definition at line 1081 of file pngenc.c.

AVCodec ff_png_encoder
Initial value:
= {
.name = "png",
.long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_PNG,
.priv_data_size = sizeof(PNGEncContext),
.init = png_enc_init,
.close = png_enc_close,
.encode2 = encode_png,
.capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_INTRA_ONLY,
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
AV_PIX_FMT_PAL8,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_YA16BE,
AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
},
.priv_class = &pngenc_class,
}
AV_CODEC_ID_PNG
Definition: avcodec.h:169
AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:65
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
encode_png
static int encode_png(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: pngenc.c:502
pngenc_class
static const AVClass pngenc_class
Definition: pngenc.c:1074
AV_CODEC_CAP_INTRA_ONLY
#define AV_CODEC_CAP_INTRA_ONLY
Codec is intra only.
Definition: avcodec.h:940
AV_PIX_FMT_PAL8
8 bit with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:74
AV_PIX_FMT_RGBA64BE
packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is st...
Definition: pixfmt.h:271
AV_PIX_FMT_YA16BE
16bit gray, 16bit alpha (big-endian)
Definition: pixfmt.h:246
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:920
AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:95
AV_PIX_FMT_GRAY8A
alias for AV_PIX_FMT_YA8
Definition: pixfmt.h:158
AV_PIX_FMT_GRAY16BE
Y , 16bpp, big-endian.
Definition: pixfmt.h:99
png_enc_init
static av_cold int png_enc_init(AVCodecContext *avctx)
Definition: pngenc.c:952
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:209
AV_PIX_FMT_MONOBLACK
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:73
AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:71
AV_PIX_FMT_RGB48BE
packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as big...
Definition: pixfmt.h:111
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
png_enc_close
static av_cold int png_enc_close(AVCodecContext *avctx)
Definition: pngenc.c:1055
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61

Definition at line 1088 of file pngenc.c.

AVCodec ff_apng_encoder
Initial value:
= {
.name = "apng",
.long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_APNG,
.priv_data_size = sizeof(PNGEncContext),
.init = png_enc_init,
.close = png_enc_close,
.encode2 = encode_apng,
.capabilities = CODEC_CAP_DELAY,
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
AV_PIX_FMT_PAL8,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_YA16BE,
AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
},
.priv_class = &apngenc_class,
}
AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:65
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
apngenc_class
static const AVClass apngenc_class
Definition: pngenc.c:1081
AV_PIX_FMT_PAL8
8 bit with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:74
AV_PIX_FMT_RGBA64BE
packed RGBA 16:16:16:16, 64bpp, 16R, 16G, 16B, 16A, the 2-byte value for each R/G/B/A component is st...
Definition: pixfmt.h:271
AV_PIX_FMT_YA16BE
16bit gray, 16bit alpha (big-endian)
Definition: pixfmt.h:246
CODEC_CAP_DELAY
#define CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:1064
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:95
AV_PIX_FMT_GRAY8A
alias for AV_PIX_FMT_YA8
Definition: pixfmt.h:158
AV_CODEC_ID_APNG
Definition: avcodec.h:327
encode_apng
static int encode_apng(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: pngenc.c:813
AV_PIX_FMT_GRAY16BE
Y , 16bpp, big-endian.
Definition: pixfmt.h:99
png_enc_init
static av_cold int png_enc_init(AVCodecContext *avctx)
Definition: pngenc.c:952
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:209
AV_PIX_FMT_MONOBLACK
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:73
AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:71
AV_PIX_FMT_RGB48BE
packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as big...
Definition: pixfmt.h:111
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
png_enc_close
static av_cold int png_enc_close(AVCodecContext *avctx)
Definition: pngenc.c:1055
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61

Definition at line 1109 of file pngenc.c.

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