diff options
| author | zhaoxiu.zeng <zhaoxiu.zeng@gmail.com> | 2015-02-14 23:03:13 +0800 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-02-14 17:13:16 +0100 |
| commit | a196e0c66dd4396d9c8b14cb39e9d3d9eb262b02 (patch) | |
| tree | 71c42cae8a4c47c491483823f3bee3744b2c288e /libavcodec/vc1_pred.c | |
| parent | 3b5ad8fbf77a679279c382e3c677af2d45340472 (diff) | |
| download | ffmpeg-a196e0c66dd4396d9c8b14cb39e9d3d9eb262b02.tar.gz | |
avcodec/vc1_pred: few branchless optimizations
This is also simpler
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/vc1_pred.c')
| -rw-r--r-- | libavcodec/vc1_pred.c | 68 |
1 files changed, 23 insertions, 45 deletions
diff --git a/libavcodec/vc1_pred.c b/libavcodec/vc1_pred.c index d0908ef6be..f74992b70d 100644 --- a/libavcodec/vc1_pred.c +++ b/libavcodec/vc1_pred.c @@ -392,17 +392,13 @@ void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y, /* Pullback MV as specified in 8.3.5.3.4 */ if (!v->field_mode) { int qx, qy, X, Y; + int MV = mv1 ? -60 : -28; qx = (s->mb_x << 6) + ((n == 1 || n == 3) ? 32 : 0); qy = (s->mb_y << 6) + ((n == 2 || n == 3) ? 32 : 0); X = (s->mb_width << 6) - 4; Y = (s->mb_height << 6) - 4; - if (mv1) { - if (qx + px < -60) px = -60 - qx; - if (qy + py < -60) py = -60 - qy; - } else { - if (qx + px < -28) px = -28 - qx; - if (qy + py < -28) py = -28 - qy; - } + if (qx + px < MV) px = MV - qx; + if (qy + py < MV) py = MV - qy; if (qx + px > X) px = X - qx; if (qy + py > Y) py = Y - qy; } @@ -759,25 +755,16 @@ void ff_vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], /* Pullback MV as specified in 8.3.5.3.4 */ { int qx, qy, X, Y; - if (v->profile < PROFILE_ADVANCED) { - qx = (s->mb_x << 5); - qy = (s->mb_y << 5); - X = (s->mb_width << 5) - 4; - Y = (s->mb_height << 5) - 4; - if (qx + px < -28) px = -28 - qx; - if (qy + py < -28) py = -28 - qy; - if (qx + px > X) px = X - qx; - if (qy + py > Y) py = Y - qy; - } else { - qx = (s->mb_x << 6); - qy = (s->mb_y << 6); - X = (s->mb_width << 6) - 4; - Y = (s->mb_height << 6) - 4; - if (qx + px < -60) px = -60 - qx; - if (qy + py < -60) py = -60 - qy; - if (qx + px > X) px = X - qx; - if (qy + py > Y) py = Y - qy; - } + int sh = v->profile < PROFILE_ADVANCED ? 5 : 6; + int MV = 4 - (1 << sh); + qx = (s->mb_x << sh); + qy = (s->mb_y << sh); + X = (s->mb_width << sh) - 4; + Y = (s->mb_height << sh) - 4; + if (qx + px < MV) px = MV - qx; + if (qy + py < MV) py = MV - qy; + if (qx + px > X) px = X - qx; + if (qy + py > Y) py = Y - qy; } /* Calculate hybrid prediction as specified in 8.3.5.3.5 */ if (0 && !s->first_slice_line && s->mb_x) { @@ -838,25 +825,16 @@ void ff_vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], /* Pullback MV as specified in 8.3.5.3.4 */ { int qx, qy, X, Y; - if (v->profile < PROFILE_ADVANCED) { - qx = (s->mb_x << 5); - qy = (s->mb_y << 5); - X = (s->mb_width << 5) - 4; - Y = (s->mb_height << 5) - 4; - if (qx + px < -28) px = -28 - qx; - if (qy + py < -28) py = -28 - qy; - if (qx + px > X) px = X - qx; - if (qy + py > Y) py = Y - qy; - } else { - qx = (s->mb_x << 6); - qy = (s->mb_y << 6); - X = (s->mb_width << 6) - 4; - Y = (s->mb_height << 6) - 4; - if (qx + px < -60) px = -60 - qx; - if (qy + py < -60) py = -60 - qy; - if (qx + px > X) px = X - qx; - if (qy + py > Y) py = Y - qy; - } + int sh = v->profile < PROFILE_ADVANCED ? 5 : 6; + int MV = 4 - (1 << sh); + qx = (s->mb_x << sh); + qy = (s->mb_y << sh); + X = (s->mb_width << sh) - 4; + Y = (s->mb_height << sh) - 4; + if (qx + px < MV) px = MV - qx; + if (qy + py < MV) py = MV - qy; + if (qx + px > X) px = X - qx; + if (qy + py > Y) py = Y - qy; } /* Calculate hybrid prediction as specified in 8.3.5.3.5 */ if (0 && !s->first_slice_line && s->mb_x) { |