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| author | Jason Garrett-Glaser <darkshikari@gmail.com> | 2011-01-14 21:34:25 +0000 |
|---|---|---|
| committer | Jason Garrett-Glaser <darkshikari@gmail.com> | 2011-01-14 21:34:25 +0000 |
| commit | 19fb234e4af1ff9f58ff2fdd604ac6f6bb87ad6b (patch) | |
| tree | 220be84d79d9c771c1afeab43fdd2aaa82fea01d /libavcodec/svq3.c | |
| parent | 6c18f1cda2e2b2471ebf75d30d552cb0cb61b6ad (diff) | |
| download | ffmpeg-19fb234e4af1ff9f58ff2fdd604ac6f6bb87ad6b.tar.gz | |
H.264: split luma dc idct out and implement MMX/SSE2 versions
About 2.5x the speed.
NOTE: the way that the asm code handles large qmuls is a bit suboptimal.
If x264-style dequant was used (separate shift and qmul values), it might
be possible to get some extra speed.
Originally committed as revision 26336 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/svq3.c')
| -rw-r--r-- | libavcodec/svq3.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/libavcodec/svq3.c b/libavcodec/svq3.c index 4a4a1c52cd..6d10fc5ae5 100644 --- a/libavcodec/svq3.c +++ b/libavcodec/svq3.c @@ -126,21 +126,19 @@ static const uint32_t svq3_dequant_coeff[32] = { }; -void ff_svq3_luma_dc_dequant_idct_c(DCTELEM *block, int qp) +void ff_svq3_luma_dc_dequant_idct_c(DCTELEM *output, DCTELEM *input, int qp) { const int qmul = svq3_dequant_coeff[qp]; #define stride 16 int i; int temp[16]; static const int x_offset[4] = {0, 1*stride, 4* stride, 5*stride}; - static const int y_offset[4] = {0, 2*stride, 8* stride, 10*stride}; for (i = 0; i < 4; i++){ - const int offset = y_offset[i]; - const int z0 = 13*(block[offset+stride*0] + block[offset+stride*4]); - const int z1 = 13*(block[offset+stride*0] - block[offset+stride*4]); - const int z2 = 7* block[offset+stride*1] - 17*block[offset+stride*5]; - const int z3 = 17* block[offset+stride*1] + 7*block[offset+stride*5]; + const int z0= 13*(input[4*i+0] + input[4*i+1]); + const int z1= 13*(input[4*i+0] - input[4*i+1]); + const int z2= 7* input[4*i+2] - 17*input[4*i+3]; + const int z3= 17* input[4*i+2] + 7*input[4*i+3]; temp[4*i+0] = z0+z3; temp[4*i+1] = z1+z2; @@ -155,10 +153,10 @@ void ff_svq3_luma_dc_dequant_idct_c(DCTELEM *block, int qp) const int z2 = 7* temp[4*1+i] - 17*temp[4*3+i]; const int z3 = 17* temp[4*1+i] + 7*temp[4*3+i]; - block[stride*0 +offset] = ((z0 + z3)*qmul + 0x80000) >> 20; - block[stride*2 +offset] = ((z1 + z2)*qmul + 0x80000) >> 20; - block[stride*8 +offset] = ((z1 - z2)*qmul + 0x80000) >> 20; - block[stride*10+offset] = ((z0 - z3)*qmul + 0x80000) >> 20; + output[stride*0 +offset] = ((z0 + z3)*qmul + 0x80000) >> 20; + output[stride*2 +offset] = ((z1 + z2)*qmul + 0x80000) >> 20; + output[stride*8 +offset] = ((z1 - z2)*qmul + 0x80000) >> 20; + output[stride*10+offset] = ((z0 - z3)*qmul + 0x80000) >> 20; } } #undef stride |