pngenc.c File Reference

#include "avcodec.h"
#include "internal.h"
#include "bytestream.h"
#include "dsputil.h"
#include "png.h"
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include <zlib.h>

Go to the source code of this file.

Data Structures
struct	PNGEncContext

Macros
#define	IOBUF_SIZE   4096
#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	png_filter_row (DSPContext *dsp, 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 int	png_write_row (PNGEncContext *s, const uint8_t *data, int size)
static int	encode_frame (AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
static av_cold int	png_enc_init (AVCodecContext *avctx)

Variables
static const AVOption	options []
static const AVClass	pngenc_class
AVCodec	ff_png_encoder

Macro Definition Documentation

#define IOBUF_SIZE   4096

Definition at line 32 of file pngenc.c.

Referenced by encode_frame(), and png_write_row().

#define OFFSET

(

x

)

offsetof(PNGEncContext, x)

Definition at line 475 of file pngenc.c.

#define VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 476 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 51 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 90 of file pngenc.c.

Referenced by png_filter_row().

static void png_filter_row ( DSPContext *  dsp, uint8_t *  dst, int  filter_type, uint8_t *  src, uint8_t *  top, int  size, int  bpp  )

static

Definition at line 117 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 147 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 177 of file pngenc.c.

Referenced by encode_frame(), and png_write_row().

static int png_write_row ( PNGEncContext *  s, const uint8_t *  data, int  size  )

static

Definition at line 197 of file pngenc.c.

Referenced by encode_frame().

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

static

Definition at line 217 of file pngenc.c.

static av_cold int png_enc_init ( AVCodecContext *  avctx )

static

Definition at line 437 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 }
}

Definition at line 477 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,
}

Definition at line 483 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,
    .encode2        = encode_frame,
    .capabilities   = CODEC_CAP_FRAME_THREADS | 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_MONOBLACK, AV_PIX_FMT_NONE
    },
    .priv_class     = &pngenc_class,
}

Definition at line 490 of file pngenc.c.