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lowres2 support.

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The new lowres support is limited to decoders where lowres decoding
is possible in high quality.
I was not able to measure any speed difference, but if one is found
the 2-3 lines that might affect speed can be made compile time conditional

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2012-04-22 21:37:54 +02:00
parent 92ef4be4ab
commit 70d54392f5
23 changed files with 387 additions and 45 deletions
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8
libavcodec/dv.c
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@@ -311,7 +311,13 @@ av_cold int ff_dvvideo_init(AVCodecContext *avctx)
/* 248DCT setup */
s->fdct[1] = dsp.fdct248;
s->idct_put[1] = ff_simple_idct248_put; // FIXME: need to add it to DSP
memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);
if (avctx->lowres){
for (i = 0; i < 64; i++){
int j = ff_zigzag248_direct[i];
s->dv_zigzag[1][i] = dsp.idct_permutation[(j & 7) + (j & 8) * 4 + (j & 48) / 2];
}
}else
memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);
avctx->coded_frame = &s->picture;
s->avctx = avctx;