apngdec.c File Reference

APNG demuxer. More...

#include "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.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 (const 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)
static int	apng_read_packet (AVFormatContext *s, AVPacket *pkt)

Variables
static const AVOption	options []
static const AVClass	demuxer_class
const FFInputFormat	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 41 of file apngdec.c.

Function Documentation

apng_probe()

static int apng_probe ( const AVProbeData * p )

static

Definition at line 71 of file apngdec.c.

append_extradata()

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

static

Definition at line 126 of file apngdec.c.

Referenced by apng_read_header().

apng_read_header()

static int apng_read_header ( AVFormatContext * s )

static

Definition at line 149 of file apngdec.c.

decode_fctl_chunk()

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

static

Definition at line 238 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 308 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 408 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 418 of file apngdec.c.

ff_apng_demuxer

const FFInputFormat ff_apng_demuxer

Initial value:

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

Definition at line 426 of file apngdec.c.