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cljrenc: add AVOption to disable dither 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-12-09 06:01:15 +01:00
parent a1c676c248
commit 74d9b21340
1 changed files with 23 additions and 1 deletions
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24
libavcodec/cljr.c
View File

@ -25,12 +25,15 @@
*/
#include "avcodec.h"
#include "libavutil/opt.h"
#include "get_bits.h"
#include "put_bits.h"
typedef struct CLJRContext {
AVClass *avclass;
AVCodecContext *avctx;
AVFrame picture;
int dither_type;
} CLJRContext;
static av_cold int common_init(AVCodecContext *avctx)
@ -129,6 +132,7 @@ AVCodec ff_cljr_decoder = {
static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
int buf_size, void *data)
{
CLJRContext *a = avctx->priv_data;
PutBitContext pb;
AVFrame *p = data;
int x, y;
@ -144,6 +148,10 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
uint8_t *cb = &p->data[1][y * p->linesize[1]];
uint8_t *cr = &p->data[2][y * p->linesize[2]];
for (x = 0; x < avctx->width; x += 4) {
switch (a->dither_type) {
case 0: dither = 0x492A0000; break;
case 1: dither = dither * 1664525 + 1013904223; break;
}
put_bits(&pb, 5, (luma[3] + (dither>>29) ) >> 3);
put_bits(&pb, 5, (luma[2] + ((dither>>26)&7)) >> 3);
put_bits(&pb, 5, (luma[1] + ((dither>>23)&7)) >> 3);
@ -151,7 +159,6 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
luma += 4;
put_bits(&pb, 6, (*(cb++) + ((dither>>18)&3)) >> 2);
put_bits(&pb, 6, (*(cr++) + ((dither>>16)&3)) >> 2);
dither = dither*1664525+1013904223;
}
}
@ -160,6 +167,20 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
return put_bits_count(&pb) / 8;
}
#define OFFSET(x) offsetof(CLJRContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "dither_type", "Dither type", OFFSET(dither_type), AV_OPT_TYPE_INT, { .dbl=1 }, 0, 2, VE},
{ NULL },
};
static const AVClass class = {
.class_name = "cljr encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_cljr_encoder = {
.name = "cljr",
.type = AVMEDIA_TYPE_VIDEO,
@ -170,5 +191,6 @@ AVCodec ff_cljr_encoder = {
.pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
.priv_class = &class,
};
#endif