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cljrenc: 2x2 ordered dither support.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-12-09 18:32:29 +01:00
parent 74d9b21340
commit 523da37f4c
1 changed files with 6 additions and 0 deletions
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6
libavcodec/cljr.c
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@ -137,6 +137,11 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
AVFrame *p = data; AVFrame *p = data;
int x, y; int x, y;
uint32_t dither= avctx->frame_number; uint32_t dither= avctx->frame_number;
static const uint32_t ordered_dither[2][2] =
{
{ 0x10400000, 0x104F0000 },
{ 0xCB2A0000, 0xCB250000 },
};
p->pict_type = AV_PICTURE_TYPE_I; p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1; p->key_frame = 1;
@ -151,6 +156,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
switch (a->dither_type) { switch (a->dither_type) {
case 0: dither = 0x492A0000; break; case 0: dither = 0x492A0000; break;
case 1: dither = dither * 1664525 + 1013904223; break; case 1: dither = dither * 1664525 + 1013904223; break;
case 2: dither = ordered_dither[ y&1 ][ (x>>2)&1 ];break;
} }
put_bits(&pb, 5, (luma[3] + (dither>>29) ) >> 3); put_bits(&pb, 5, (luma[3] + (dither>>29) ) >> 3);
put_bits(&pb, 5, (luma[2] + ((dither>>26)&7)) >> 3); put_bits(&pb, 5, (luma[2] + ((dither>>26)&7)) >> 3);