diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2012-04-22 21:37:54 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2012-04-22 22:26:55 +0200 |
| commit | 70d54392f5015b9c6594fcae558f59f952501e3b (patch) | |
| tree | bf8188c68474cebf9982c80cfe6244b3d4347f23 /libavcodec/dv.c | |
| parent | 92ef4be4ab9fbb7d901b22e0036a4ca90b00a476 (diff) | |
lowres2 support.
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>
Diffstat (limited to 'libavcodec/dv.c')
| -rw-r--r-- | libavcodec/dv.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/libavcodec/dv.c b/libavcodec/dv.c index e13026628d..5bb84793b5 100644 --- a/libavcodec/dv.c +++ b/libavcodec/dv.c @@ -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; |