apngenc.c File Reference

#include "avformat.h"
#include "internal.h"
#include "libavutil/avassert.h"
#include "libavutil/crc.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavcodec/png.h"
#include "libavcodec/apng.h"

Go to the source code of this file.

Data Structures
struct	APNGMuxContext

Macros
#define	OFFSET(x)   offsetof(APNGMuxContext, x)
#define	ENC   AV_OPT_FLAG_ENCODING_PARAM

Functions
static uint8_t *	apng_find_chunk (uint32_t tag, uint8_t *buf, size_t length)
static void	apng_write_chunk (AVIOContext *io_context, uint32_t tag, uint8_t *buf, size_t length)
static int	apng_write_header (AVFormatContext *format_context)
static int	flush_packet (AVFormatContext *format_context, AVPacket *packet)
static int	apng_write_packet (AVFormatContext *format_context, AVPacket *packet)
static int	apng_write_trailer (AVFormatContext *format_context)

Variables
static const AVOption	options []
static const AVClass	apng_muxer_class
AVOutputFormat	ff_apng_muxer

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(APNGMuxContext, x)

Definition at line 275 of file apngenc.c.

ENC

#define ENC   AV_OPT_FLAG_ENCODING_PARAM

Definition at line 276 of file apngenc.c.

Function Documentation

apng_find_chunk()

static uint8_t* apng_find_chunk ( uint32_t  tag, uint8_t *  buf, size_t  length  )

static

Definition at line 52 of file apngenc.c.

Referenced by flush_packet().

apng_write_chunk()

static void apng_write_chunk ( AVIOContext *  io_context, uint32_t  tag, uint8_t *  buf, size_t  length  )

static

Definition at line 61 of file apngenc.c.

Referenced by apng_write_trailer(), and flush_packet().

apng_write_header()

static int apng_write_header ( AVFormatContext *  format_context )

static

Definition at line 81 of file apngenc.c.

flush_packet()

static int flush_packet ( AVFormatContext *  format_context, AVPacket *  packet  )

static

Definition at line 116 of file apngenc.c.

Referenced by apng_write_packet(), and apng_write_trailer().

apng_write_packet()

static int apng_write_packet ( AVFormatContext *  format_context, AVPacket *  packet  )

static

Definition at line 225 of file apngenc.c.

apng_write_trailer()

static int apng_write_trailer ( AVFormatContext *  format_context )

static

Definition at line 245 of file apngenc.c.

Variable Documentation

options

const AVOption options[]

static

Initial value:

= {
    { "plays", "Number of times to play the output: 0 - infinite loop, 1 - no loop", OFFSET(plays),
      AV_OPT_TYPE_INT, { .i64 = 1 }, 0, UINT_MAX, ENC },
    { "final_delay", "Force delay after the last frame", OFFSET(last_delay),
      AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, USHRT_MAX, ENC },
    { NULL },
}

Definition at line 277 of file apngenc.c.

apng_muxer_class

const AVClass apng_muxer_class

static

Initial value:

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

Definition at line 285 of file apngenc.c.

ff_apng_muxer

AVOutputFormat ff_apng_muxer

Initial value:

= {
    .name           = "apng",
    .long_name      = NULL_IF_CONFIG_SMALL("Animated Portable Network Graphics"),
    .mime_type      = "image/png",
    .extensions     = "apng",
    .priv_data_size = sizeof(APNGMuxContext),
    .audio_codec    = AV_CODEC_ID_NONE,
    .video_codec    = AV_CODEC_ID_APNG,
    .write_header   = apng_write_header,
    .write_packet   = apng_write_packet,
    .write_trailer  = apng_write_trailer,
    .priv_class     = &apng_muxer_class,
    .flags          = AVFMT_VARIABLE_FPS,
}

Definition at line 292 of file apngenc.c.