pngenc.c File Reference

#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "exif_internal.h"
#include "bytestream.h"
#include "lossless_videoencdsp.h"
#include "png.h"
#include "apng.h"
#include "zlib_wrapper.h"
#include "libavutil/avassert.h"
#include "libavutil/buffer.h"
#include "libavutil/crc.h"
#include "libavutil/csp.h"
#include "libavutil/libm.h"
#include "libavutil/mastering_display_metadata.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/rational.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	PNG_LRINT(d, divisor)
#define	PNG_Q2D(q, divisor)
#define	AV_WB32_PNG_D(buf, q)
#define	OFFSET(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, const uint8_t *src, const 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, const uint8_t *src, const uint8_t *top, int size, int bpp)
static uint8_t *	png_choose_filter (PNGEncContext *s, uint8_t *dst, const uint8_t *src, const 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	png_write_iccp (PNGEncContext *s, const AVFrameSideData *sd)
static int	encode_headers (AVCodecContext *avctx, const AVFrame *pict)
static int	encode_frame (AVCodecContext *avctx, const AVFrame *pict)
static int	add_icc_profile_size (AVCodecContext *avctx, const AVFrame *pict, uint64_t *max_packet_size)
static int	add_exif_profile_size (AVCodecContext *avctx, const AVFrame *pict, uint64_t *max_packet_size)
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 FFCodec	ff_png_encoder
const FFCodec	ff_apng_encoder

Macro Definition Documentation

IOBUF_SIZE

#define IOBUF_SIZE   4096

Definition at line 45 of file pngenc.c.

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

PNG_LRINT

#define PNG_LRINT	(		d,
			divisor )

Value:

lrint((d) * (divisor))

Definition at line 305 of file pngenc.c.

Referenced by png_get_gama().

PNG_Q2D

#define PNG_Q2D	(		q,
			divisor )

Value:

PNG_LRINT(av_q2d(q), (divisor))

Definition at line 306 of file pngenc.c.

Referenced by encode_headers().

AV_WB32_PNG_D

#define AV_WB32_PNG_D	(		buf,
			q )

Value:

AV_WB32(buf, PNG_Q2D(q, 100000))

Definition at line 307 of file pngenc.c.

Referenced by png_get_chrm().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(PNGEncContext, x)

Definition at line 1267 of file pngenc.c.

VE

#define VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 1268 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 91 of file pngenc.c.

Referenced by encode_frame().

sub_png_paeth_prediction()

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

static

Definition at line 130 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 158 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, const uint8_t * src, const uint8_t * top, int size, int bpp )

static

Definition at line 174 of file pngenc.c.

Referenced by png_choose_filter().

png_choose_filter()

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

static

Definition at line 205 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 235 of file pngenc.c.

Referenced by encode_apng(), encode_headers(), encode_png(), png_write_iccp(), 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 255 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 283 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 308 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 326 of file pngenc.c.

Referenced by encode_headers().

png_write_iccp()

static int png_write_iccp ( PNGEncContext * s, const AVFrameSideData * sd )

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 378 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 521 of file pngenc.c.

Referenced by apng_encode_frame(), and encode_png().

add_icc_profile_size()

static int add_icc_profile_size ( AVCodecContext * avctx, const AVFrame * pict, uint64_t * max_packet_size )

static

Definition at line 615 of file pngenc.c.

Referenced by encode_apng(), and encode_png().

add_exif_profile_size()

static int add_exif_profile_size ( AVCodecContext * avctx, const AVFrame * pict, uint64_t * max_packet_size )

static

Definition at line 643 of file pngenc.c.

Referenced by encode_apng(), and encode_png().

encode_png()

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

static

Definition at line 676 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 726 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 872 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 1005 of file pngenc.c.

png_enc_init()

static av_cold int png_enc_init ( AVCodecContext * avctx )

static

Definition at line 1166 of file pngenc.c.

png_enc_close()

static av_cold int png_enc_close ( AVCodecContext * avctx )

static

Definition at line 1253 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_PAETH }, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED, VE, .unit = "pred" },
        { "none",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_NONE },  INT_MIN, INT_MAX, VE, .unit = "pred" },
        { "sub",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_SUB },   INT_MIN, INT_MAX, VE, .unit = "pred" },
        { "up",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_UP },    INT_MIN, INT_MAX, VE, .unit = "pred" },
        { "avg",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_AVG },   INT_MIN, INT_MAX, VE, .unit = "pred" },
        { "paeth", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_PAETH }, INT_MIN, INT_MAX, VE, .unit = "pred" },
        { "mixed", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_MIXED }, INT_MIN, INT_MAX, VE, .unit = "pred" },
    { NULL},
}

Definition at line 1269 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 1282 of file pngenc.c.

ff_png_encoder

const FFCodec ff_png_encoder

Initial value:

= {
    .p.name         = "png",
    CODEC_LONG_NAME("PNG (Portable Network Graphics) image"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_PNG,
    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
                      AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
    .priv_data_size = sizeof(PNGEncContext),
    .init           = png_enc_init,
    .close          = png_enc_close,
    FF_CODEC_ENCODE_CB(encode_png),
    CODEC_PIXFMTS(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),
    .alpha_modes    = AVALPHA_MODE_STRAIGHT,
    .p.priv_class   = &pngenc_class,
    .caps_internal  = FF_CODEC_CAP_ICC_PROFILES,
}

Definition at line 1289 of file pngenc.c.

ff_apng_encoder

const FFCodec ff_apng_encoder

Initial value:

= {
    .p.name         = "apng",
    CODEC_LONG_NAME("APNG (Animated Portable Network Graphics) image"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_APNG,
    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
                      AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
    .priv_data_size = sizeof(PNGEncContext),
    .init           = png_enc_init,
    .close          = png_enc_close,
    FF_CODEC_ENCODE_CB(encode_apng),
    CODEC_PIXFMTS(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),
    .alpha_modes    = AVALPHA_MODE_STRAIGHT,
    .p.priv_class   = &pngenc_class,
    .caps_internal  = FF_CODEC_CAP_ICC_PROFILES,
}

Definition at line 1311 of file pngenc.c.