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increasing precission of the quantization parameter 

this is needed as the quantization stepsize for each subband is also in this precission and insignificant changes to the wavelet like scaling its coefficients slightly differently would lead to wildly variing PSNR and bitrate
note, a encoder could also simply choose to leave the least significant bits of the quantization parameters zero which would give the exact previous behaviour except a y very tiny number of bits in  the header

Originally committed as revision 4115 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-04-09 22:15:48 +00:00
parent c97de57c39
commit a0a74ad9f0
3 changed files with 13 additions and 13 deletions
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2
libavcodec/snow.c
View File

@ -31,7 +31,7 @@
#define MAX_DECOMPOSITIONS 8
#define MAX_PLANES 4
#define DWTELEM int
#define QSHIFT 3
#define QSHIFT 5
#define QROOT (1<<QSHIFT)
#define LOSSLESS_QLOG -128
#define FRAC_BITS 8

12
tests/ffmpeg.regression.ref
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@ -119,12 +119,12 @@ a7ef4746f27be309138c188e327d3ebe *./data/a-ffv1.avi
2653642 ./data/a-ffv1.avi
799d3db687f6cdd7a837ec156efc171f *./data/out.yuv
stddev: 0.00 PSNR:99.99 bytes:7602176
3e7738ae0429e48d3465d4f941eb7448 *./data/a-snow.avi
1280602 ./data/a-snow.avi
e4b8c83278efee032a84569c25593937 *./data/out.yuv
stddev: 2.92 PSNR:38.79 bytes:7602176
45687368463932f08dbc74c973ad32dd *./data/a-snow53.avi
3537042 ./data/a-snow53.avi
15527997420c2ace9ab26e4504f7ca8d *./data/a-snow.avi
1269510 ./data/a-snow.avi
20e858677a35136bfa0765fafd3f9385 *./data/out.yuv
stddev: 2.96 PSNR:38.67 bytes:7602176
28b6a82fdd8058e2df35778c9a5edbbf *./data/a-snow53.avi
3537074 ./data/a-snow53.avi
799d3db687f6cdd7a837ec156efc171f *./data/out.yuv
stddev: 0.00 PSNR:99.99 bytes:7602176
b5b6275f58f012de73644bbaa9080097 *./data/a-svq1.mov

12
tests/rotozoom.regression.ref
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@ -119,12 +119,12 @@ d0831a8339491fd680b650f05262e5d9 *./data/a-ffv1.avi
3524768 ./data/a-ffv1.avi
dde5895817ad9d219f79a52d0bdfb001 *./data/out.yuv
stddev: 0.00 PSNR:99.99 bytes:7602176
6e0ea3a5128f54f42e5fdb81532d95fe *./data/a-snow.avi
332700 ./data/a-snow.avi
1f3439e1b3ff09492f196a024d7119e3 *./data/out.yuv
stddev: 2.37 PSNR:40.60 bytes:7602176
92ab639886be86087942dd76cfd91bf3 *./data/a-snow53.avi
2724572 ./data/a-snow53.avi
7b3468914d99ff2803c35560a0a4a6f0 *./data/a-snow.avi
327494 ./data/a-snow.avi
3c1e7765d9be2af73e992c2f6d769e7b *./data/out.yuv
stddev: 2.40 PSNR:40.52 bytes:7602176
8b510a8e4a26d6d469bd80b46922d5e6 *./data/a-snow53.avi
2724602 ./data/a-snow53.avi
dde5895817ad9d219f79a52d0bdfb001 *./data/out.yuv
stddev: 0.00 PSNR:99.99 bytes:7602176
920c610ec324b772d882b0717e375943 *./data/a-svq1.mov