pngenc.c File Reference

#include "avcodec.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
static const AVClass	apngenc_class
AVCodec	ff_png_encoder
AVCodec	ff_apng_encoder

Macro Definition Documentation

IOBUF_SIZE

#define IOBUF_SIZE   4096

Definition at line 38 of file pngenc.c.

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

AV_WB32_PNG

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

Definition at line 292 of file pngenc.c.

Referenced by png_get_chrm(), and png_get_gama().

OFFSET

#define OFFSET

(

x

)

offsetof(PNGEncContext, x)

Definition at line 1111 of file pngenc.c.

VE

#define VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 1112 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 82 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 121 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 149 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 165 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 194 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 224 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 243 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 271 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 293 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 335 of file pngenc.c.

Referenced by encode_headers().

encode_headers()

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

static

Definition at line 345 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 431 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 524 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 569 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 712 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 841 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 1098 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 1113 of file pngenc.c.

pngenc_class

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 1126 of file pngenc.c.

apngenc_class

const AVClass apngenc_class

static

Initial value:

= {
    .class_name = "APNG encoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 1133 of file pngenc.c.

ff_png_encoder

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,
}

Definition at line 1140 of file pngenc.c.

ff_apng_encoder

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   = AV_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,
}

Definition at line 1161 of file pngenc.c.