apngdec.c File Reference

APNG demuxer. More...

#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavcodec/apng.h"
#include "libavcodec/png.h"
#include "libavcodec/bytestream.h"

Go to the source code of this file.

Data Structures
struct	APNGDemuxContext

Macros
#define	DEFAULT_APNG_FPS   15

Functions
static int	apng_probe (AVProbeData *p)
static int	append_extradata (AVCodecParameters *par, AVIOContext *pb, int len)
static int	apng_read_header (AVFormatContext *s)
static int	decode_fctl_chunk (AVFormatContext *s, APNGDemuxContext *ctx, AVPacket *pkt)
static int	apng_read_packet (AVFormatContext *s, AVPacket *pkt)

Variables
static const AVOption	options []
static const AVClass	demuxer_class
AVInputFormat	ff_apng_demuxer

Detailed Description

APNG demuxer.

See also

https://wiki.mozilla.org/APNG_Specification

http://www.w3.org/TR/PNG

Definition in file apngdec.c.

Macro Definition Documentation

DEFAULT_APNG_FPS

#define DEFAULT_APNG_FPS   15

Definition at line 39 of file apngdec.c.

Function Documentation

apng_probe()

static int apng_probe ( AVProbeData *  p )

static

Definition at line 70 of file apngdec.c.

append_extradata()

static int append_extradata ( AVCodecParameters *  par, AVIOContext *  pb, int  len  )

static

Definition at line 125 of file apngdec.c.

Referenced by apng_read_header().

apng_read_header()

static int apng_read_header ( AVFormatContext *  s )

static

Definition at line 147 of file apngdec.c.

decode_fctl_chunk()

static int decode_fctl_chunk ( AVFormatContext *  s, APNGDemuxContext *  ctx, AVPacket *  pkt  )

static

Definition at line 252 of file apngdec.c.

Referenced by apng_read_packet().

apng_read_packet()

static int apng_read_packet ( AVFormatContext *  s, AVPacket *  pkt  )

static

Definition at line 322 of file apngdec.c.

Variable Documentation

options

const AVOption options[]

static

Initial value:

= {
    { "ignore_loop", "ignore loop setting"                         , 0x42,
      AV_OPT_TYPE_BOOL, { .i64 = 1 }              , 0, 1      , AV_OPT_FLAG_DECODING_PARAM },
    { "max_fps"    , "maximum framerate (0 is no limit)"           , 0x42,
      AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
    { "default_fps", "default framerate (0 is as fast as possible)", 0x42,
      AV_OPT_TYPE_INT, { .i64 = DEFAULT_APNG_FPS }, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
    { NULL },
}

Definition at line 416 of file apngdec.c.

demuxer_class

const AVClass demuxer_class

static

Initial value:

= {
    .class_name = "APNG demuxer",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_DEMUXER,
}

Definition at line 426 of file apngdec.c.

ff_apng_demuxer

AVInputFormat ff_apng_demuxer

Initial value:

= {
    .name           = "apng",
    .long_name      = NULL_IF_CONFIG_SMALL("Animated Portable Network Graphics"),
    .priv_data_size = sizeof(APNGDemuxContext),
    .read_probe     = apng_probe,
    .read_header    = apng_read_header,
    .read_packet    = apng_read_packet,
    .flags          = AVFMT_GENERIC_INDEX,
    .priv_class     = &demuxer_class,
}

Definition at line 434 of file apngdec.c.