FFmpeg
Data Structures | Macros | Functions | Variables
pngenc.c File Reference
#include "avcodec.h"
#include "encode.h"
#include "internal.h"
#include "bytestream.h"
#include "lossless_videoencdsp.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 "libavutil/stereo3d.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
 
const AVCodec ff_png_encoder
 
const AVCodec ff_apng_encoder
 

Macro Definition Documentation

◆ IOBUF_SIZE

#define IOBUF_SIZE   4096

Definition at line 39 of file pngenc.c.

◆ AV_WB32_PNG

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

Definition at line 293 of file pngenc.c.

◆ OFFSET

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

Definition at line 1095 of file pngenc.c.

◆ VE

#define VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 1096 of file pngenc.c.

Function Documentation

◆ png_get_interlaced_row()

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 83 of file pngenc.c.

Referenced by encode_frame().

◆ sub_png_paeth_prediction()

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

Definition at line 122 of file pngenc.c.

Referenced by png_filter_row().

◆ sub_left_prediction()

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

Definition at line 150 of file pngenc.c.

Referenced by png_filter_row().

◆ 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 166 of file pngenc.c.

Referenced by png_choose_filter().

◆ 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 195 of file pngenc.c.

Referenced by encode_frame().

◆ png_write_chunk()

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

Definition at line 225 of file pngenc.c.

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

◆ png_write_image_data()

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

Definition at line 244 of file pngenc.c.

Referenced by encode_frame(), and png_write_row().

◆ png_write_row()

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

Definition at line 272 of file pngenc.c.

Referenced by encode_frame().

◆ png_get_chrm()

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

Definition at line 294 of file pngenc.c.

Referenced by encode_headers().

◆ png_get_gama()

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

Definition at line 336 of file pngenc.c.

Referenced by encode_headers().

◆ encode_headers()

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

Definition at line 346 of file pngenc.c.

Referenced by encode_apng(), and encode_png().

◆ encode_frame()

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

Definition at line 432 of file pngenc.c.

Referenced by apng_encode_frame(), and encode_png().

◆ encode_png()

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

Definition at line 525 of file pngenc.c.

◆ apng_do_inverse_blend()

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

Definition at line 570 of file pngenc.c.

Referenced by apng_encode_frame().

◆ 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 713 of file pngenc.c.

Referenced by encode_apng().

◆ encode_apng()

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

Definition at line 842 of file pngenc.c.

◆ png_enc_init()

static av_cold int png_enc_init ( AVCodecContext *  avctx)
static

Definition at line 989 of file pngenc.c.

◆ png_enc_close()

static av_cold int png_enc_close ( AVCodecContext *  avctx)
static

Definition at line 1082 of file pngenc.c.

Variable Documentation

◆ options

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},
{ "pred", "Prediction method", OFFSET(filter_type), AV_OPT_TYPE_INT, { .i64 = PNG_FILTER_VALUE_NONE }, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED, VE, "pred" },
{ "none", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_NONE }, INT_MIN, INT_MAX, VE, "pred" },
{ "sub", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_SUB }, INT_MIN, INT_MAX, VE, "pred" },
{ "up", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_UP }, INT_MIN, INT_MAX, VE, "pred" },
{ "avg", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_AVG }, INT_MIN, INT_MAX, VE, "pred" },
{ "paeth", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_PAETH }, INT_MIN, INT_MAX, VE, "pred" },
{ "mixed", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_MIXED }, INT_MIN, INT_MAX, VE, "pred" },
{ NULL},
}

Definition at line 1097 of file pngenc.c.

◆ pngenc_class

const AVClass pngenc_class
static
Initial value:
= {
.class_name = "(A)PNG encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
}

Definition at line 1110 of file pngenc.c.

◆ ff_png_encoder

const 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,
.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,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
}

Definition at line 1117 of file pngenc.c.

◆ ff_apng_encoder

const 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,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
.priv_data_size = sizeof(PNGEncContext),
.init = png_enc_init,
.close = png_enc_close,
.encode2 = encode_apng,
.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_NONE
},
.priv_class = &pngenc_class,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
}

Definition at line 1139 of file pngenc.c.

FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AV_PIX_FMT_RGBA64BE
@ 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:195
PNG_FILTER_VALUE_MIXED
#define PNG_FILTER_VALUE_MIXED
Definition: png.h:45
AV_CODEC_ID_APNG
@ AV_CODEC_ID_APNG
Definition: codec_id.h:264
init
static int init
Definition: av_tx.c:47
AV_PIX_FMT_GRAY16BE
@ AV_PIX_FMT_GRAY16BE
Y , 16bpp, big-endian.
Definition: pixfmt.h:97
encode_png
static int encode_png(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: pngenc.c:525
encode_apng
static int encode_apng(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: pngenc.c:842
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:296
AV_PIX_FMT_RGBA
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
AV_CODEC_ID_PNG
@ AV_CODEC_ID_PNG
Definition: codec_id.h:111
PNGEncContext
Definition: pngenc.c:49
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:113
AV_PIX_FMT_GRAY8A
@ AV_PIX_FMT_GRAY8A
alias for AV_PIX_FMT_YA8
Definition: pixfmt.h:136
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
NULL
#define NULL
Definition: coverity.c:32
AV_PIX_FMT_MONOBLACK
@ 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:76
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
png_enc_close
static av_cold int png_enc_close(AVCodecContext *avctx)
Definition: pngenc.c:1082
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
PNG_FILTER_VALUE_NONE
#define PNG_FILTER_VALUE_NONE
Definition: png.h:40
AV_PIX_FMT_RGB24
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
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:117
AV_PIX_FMT_YA16BE
@ AV_PIX_FMT_YA16BE
16 bits gray, 16 bits alpha (big-endian)
Definition: pixfmt.h:202
PNG_FILTER_VALUE_AVG
#define PNG_FILTER_VALUE_AVG
Definition: png.h:43
PNG_FILTER_VALUE_PAETH
#define PNG_FILTER_VALUE_PAETH
Definition: png.h:44
PNG_FILTER_VALUE_UP
#define PNG_FILTER_VALUE_UP
Definition: png.h:42
OFFSET
#define OFFSET(x)
Definition: pngenc.c:1095
PNG_FILTER_VALUE_SUB
#define PNG_FILTER_VALUE_SUB
Definition: png.h:41
AV_PIX_FMT_RGB48BE
@ 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:102
options
static const AVOption options[]
Definition: pngenc.c:1097
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:82
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
png_enc_init
static av_cold int png_enc_init(AVCodecContext *avctx)
Definition: pngenc.c:989
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:233
VE
#define VE
Definition: pngenc.c:1096
pngenc_class
static const AVClass pngenc_class
Definition: pngenc.c:1110
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