diff options
Diffstat (limited to 'libavcodec/msmpeg4.c')
| -rw-r--r-- | libavcodec/msmpeg4.c | 39 |
1 files changed, 29 insertions, 10 deletions
diff --git a/libavcodec/msmpeg4.c b/libavcodec/msmpeg4.c index 962bd1823a..9a2cb53ff8 100644 --- a/libavcodec/msmpeg4.c +++ b/libavcodec/msmpeg4.c @@ -347,16 +347,35 @@ void msmpeg4_encode_mb(MpegEncContext * s, /* strongly inspirated from MPEG4, but not exactly the same ! */ void msmpeg4_dc_scale(MpegEncContext * s) { - int scale; - - if (s->qscale < 5) - scale = 8; - else if (s->qscale < 9) - scale = 2 * s->qscale; - else - scale = s->qscale + 8; - s->y_dc_scale = scale; - s->c_dc_scale = (s->qscale + 13) / 2; + if (s->qscale < 5){ + s->y_dc_scale = 8; + s->c_dc_scale = 8; +// s->c_dc_scale = (s->qscale + 13)>>1; + }else if (s->qscale < 9){ + s->y_dc_scale = 2 * s->qscale; + s->c_dc_scale = (s->qscale + 13)>>1; + }else{ + s->y_dc_scale = s->qscale + 8; + s->c_dc_scale = (s->qscale + 13)>>1; + } + // this differs for quant >24 from mpeg4 + +// if(s->qscale==13) s->c_dc_scale=14; + +// if(s->qscale>=6) +// printf("%d", s->qscale); + + /* s->c_dc_scale values (found by Michael Nidermayer) + qscale=2 -> 8 (yes iam sure about that) + qscale=3 -> 8 + qscale=4 -> 8 + qscale=5 -> 9 + qscale=6 -> 9 + qscale=7 -> 10 + qscale=8 -> 10 + qscale=9 -> 11 + qscale=10-> 11 + */ } /* dir = 0: left, dir = 1: top prediction */ |