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gif.c File Reference

GIF encoder. More...

#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "lzw.h"
#include "gif.h"
#include "put_bits.h"

Go to the source code of this file.

Data Structures

struct  GIFContext
 

Macros

#define BITSTREAM_WRITER_LE
 
#define OFFSET(x)   offsetof(GIFContext, x)
 
#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 

Enumerations

enum  { GF_OFFSETTING = 1<<0, GF_TRANSDIFF = 1<<1 }
 

Functions

static int pick_palette_entry (const uint8_t *buf, int linesize, int w, int h)
 
static int gif_image_write_image (AVCodecContext *avctx, uint8_t **bytestream, uint8_t *end, const uint32_t *palette, const uint8_t *buf, const int linesize, AVPacket *pkt)
 
static av_cold int gif_encode_init (AVCodecContext *avctx)
 
static int get_palette_transparency_index (const uint32_t *palette)
 
static int gif_encode_frame (AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
 
static int gif_encode_close (AVCodecContext *avctx)
 

Variables

static const AVOption gif_options []
 
static const AVClass gif_class
 
AVCodec ff_gif_encoder
 

Detailed Description

GIF encoder.

See Also
http://www.w3.org/Graphics/GIF/spec-gif89a.txt

Definition in file gif.c.

Macro Definition Documentation

#define BITSTREAM_WRITER_LE

Definition at line 31 of file gif.c.

#define OFFSET (   x)    offsetof(GIFContext, x)

Definition at line 332 of file gif.c.

Definition at line 333 of file gif.c.

Enumeration Type Documentation

anonymous enum
Enumerator
GF_OFFSETTING 
GF_TRANSDIFF 

Definition at line 56 of file gif.c.

Function Documentation

static int pick_palette_entry ( const uint8_t buf,
int  linesize,
int  w,
int  h 
)
static

Definition at line 61 of file gif.c.

Referenced by gif_image_write_image().

static int gif_image_write_image ( AVCodecContext avctx,
uint8_t **  bytestream,
uint8_t end,
const uint32_t *  palette,
const uint8_t buf,
const int  linesize,
AVPacket pkt 
)
static

Definition at line 77 of file gif.c.

Referenced by gif_encode_frame().

static av_cold int gif_encode_init ( AVCodecContext avctx)
static

Definition at line 217 of file gif.c.

static int get_palette_transparency_index ( const uint32_t *  palette)
static

Definition at line 248 of file gif.c.

Referenced by gif_encode_frame().

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

Definition at line 266 of file gif.c.

static int gif_encode_close ( AVCodecContext avctx)
static

Definition at line 320 of file gif.c.

Variable Documentation

const AVOption gif_options[]
static
Initial value:
= {
{ "gifflags", "set GIF flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = GF_OFFSETTING|GF_TRANSDIFF}, 0, INT_MAX, FLAGS, "flags" },
{ "offsetting", "enable picture offsetting", 0, AV_OPT_TYPE_CONST, {.i64=GF_OFFSETTING}, INT_MIN, INT_MAX, FLAGS, "flags" },
{ "transdiff", "enable transparency detection between frames", 0, AV_OPT_TYPE_CONST, {.i64=GF_TRANSDIFF}, INT_MIN, INT_MAX, FLAGS, "flags" },
{ NULL }
}
#define NULL
Definition: coverity.c:32
static int flags
Definition: log.c:57
#define FLAGS
Definition: gif.c:333
#define OFFSET(x)
Definition: gif.c:332

Definition at line 334 of file gif.c.

const AVClass gif_class
static
Initial value:
= {
.class_name = "GIF encoder",
.item_name = av_default_item_name,
.option = gif_options,
}
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
av_default_item_name
static const AVOption gif_options[]
Definition: gif.c:334

Definition at line 341 of file gif.c.

AVCodec ff_gif_encoder
Initial value:
= {
.name = "gif",
.long_name = NULL_IF_CONFIG_SMALL("GIF (Graphics Interchange Format)"),
.priv_data_size = sizeof(GIFContext),
.encode2 = gif_encode_frame,
.close = gif_encode_close,
.pix_fmts = (const enum AVPixelFormat[]){
},
.priv_class = &gif_class,
}
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int gif_encode_close(AVCodecContext *avctx)
Definition: gif.c:320
static const AVClass gif_class
Definition: gif.c:341
packed RGB 1:2:1, 8bpp, (msb)1B 2G 1R(lsb)
Definition: pixfmt.h:86
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
Definition: gif.c:42
packed RGB 1:2:1, 8bpp, (msb)1R 2G 1B(lsb)
Definition: pixfmt.h:89
packed RGB 3:3:2, 8bpp, (msb)2B 3G 3R(lsb)
Definition: pixfmt.h:84
static int gif_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: gif.c:266
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:262
Y , 8bpp.
Definition: pixfmt.h:70
packed RGB 3:3:2, 8bpp, (msb)2R 3G 3B(lsb)
Definition: pixfmt.h:87
static av_cold int gif_encode_init(AVCodecContext *avctx)
Definition: gif.c:217
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60

Definition at line 348 of file gif.c.