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Code Issues Releases Activity

lavc/gif: make possible to disable offsetting.

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This commit is contained in:
Clément Bœsch 2013-04-19 23:36:55 +02:00
parent 8f116bf71b
commit 0f1250b7e5
1 changed files with 24 additions and 1 deletions
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25
libavcodec/gif.c
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@ -28,6 +28,7 @@
* @see http://www.w3.org/Graphics/GIF/spec-gif89a.txt
*/
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
@ -40,12 +41,18 @@
#include "put_bits.h"
typedef struct {
const AVClass *class;
AVFrame picture;
LZWState *lzw;
uint8_t *buf;
AVFrame *last_frame;
int flags;
} GIFContext;
enum {
GF_OFFSETTING = 1<<0,
};
static int gif_image_write_image(AVCodecContext *avctx,
uint8_t **bytestream, uint8_t *end,
const uint32_t *palette,
@ -58,7 +65,7 @@ static int gif_image_write_image(AVCodecContext *avctx,
/* Crop image */
// TODO support with palette change
if (s->last_frame && !palette) {
if ((s->flags & GF_OFFSETTING) && s->last_frame && !palette) {
const uint8_t *ref = s->last_frame->data[0];
const int ref_linesize = s->last_frame->linesize[0];
int x_end = avctx->width - 1,
@ -224,6 +231,21 @@ static int gif_encode_close(AVCodecContext *avctx)
return 0;
}
#define OFFSET(x) offsetof(GIFContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption gif_options[] = {
{ "gifflags", "set GIF flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = GF_OFFSETTING}, 0, INT_MAX, FLAGS, "flags" },
{ "offsetting", "enable picture offsetting", 0, AV_OPT_TYPE_CONST, {.i64=GF_OFFSETTING}, INT_MIN, INT_MAX, FLAGS, "flags" },
{ NULL }
};
static const AVClass gif_class = {
.class_name = "GIF encoder",
.item_name = av_default_item_name,
.option = gif_options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_gif_encoder = {
.name = "gif",
.type = AVMEDIA_TYPE_VIDEO,
@ -237,4 +259,5 @@ AVCodec ff_gif_encoder = {
AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE
},
.long_name = NULL_IF_CONFIG_SMALL("GIF (Graphics Interchange Format)"),
.priv_class = &gif_class,
};