To answer the couple of questions that were asked over the weekend. Rostislav, about the performance. I can see how to force a particular IDCT implementation for real world decoding (the -idct option) but the MPEG2 HD sample I've been working with mostly uses the "idct add" function which doesn't exist for the functions in simple_idct10.asm. So for a next best thing, these are the results from the dct testing utility over several runs.
> SIMPLE-C: 9124.8 ± 7.52 > SIMPLE-MMX: 11281.9 ± 32.67 > SIMPLE-SSE2: 15453.3 ± 78.86 (the adaption in the first 3 patches) > SIMPLE8-SSE2: 15684.2 ± 7.52 (from simple_idct10.asm) > SIMPLE8-AVX: 15398.4 ± 6.36 (simple_idct10.asm again) I will try to get some real world results, eventually. Ronald, yes. I was thinking that the first 3 could be ignored if I can get the latter patches to work correctly (pass fate that is). I forgot to mention in my cover letter that although the dct test passes, fate does not. As I mentioned on IRC, changing them causes errors elsewhere in fate. I am currently looking into this problem and I'm sure I will speak to you or others about it. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
