[Mplayer-dev-eng] Dynamic output quality patch

[Timothy B. Terriberry]

I got annoyed that my avi's were skipping the other day, and thought
they looked like crap without post-processing, so I wrote a little patch
to dynamically select the output quality based on current CPU usage (at
least for DivX, OpenDivX, and MPEG). Skipping goes away, and most of the
time stuff looks good.

The patch is to mplayer.c from the 0.17a Ideg Counter version, so you'll
probably have to do a little work to apply it to the current version of
that file.
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> int output_quality;
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> output_quality=divx_quality;
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<    printf("DivX setting result = %d\n", DS_SetAttr_DivX("Quality",divx_quality) );
---
>    printf("DivX setting result = %d\n", DS_SetAttr_DivX("Quality",output_quality>4?4:output_quality) );
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< 	dec_set.postproc_level = divx_quality;
---
> 	dec_set.postproc_level = (1<<output_quality)-1;
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<    picture->pp_options=divx_quality;
---
>    picture->pp_options=(1<<output_quality)-1;
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<    if(divx_quality){
---
>    if(output_quality){
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> double cvideo_base_vtime;
> double cvideo_base_vframe;
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> cvideo_base_vframe=v_frame;
> cvideo_base_vtime=video_time_usage;
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>     float vdecode_time;
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<       t2=GetTimer();t=t2-t;video_time_usage+=t*0.000001f;
---
>       t2=GetTimer();t=t2-t;
>       vdecode_time=t*0.000001f;video_time_usage+=vdecode_time;
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<       t2=GetTimer();t=t2-t;video_time_usage+=t*0.000001f;
---
>       t2=GetTimer();t=t2-t;
>       vdecode_time=t*0.000001f;video_time_usage+=vdecode_time;
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<       t2=GetTimer();t=t2-t;video_time_usage+=t*0.000001f;
---
>       t2=GetTimer();t=t2-t;
>       vdecode_time=t*0.000001f;video_time_usage+=vdecode_time;
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<         t+=GetTimer(); video_time_usage+=t*0.000001;
---
>         t+=GetTimer();
>         vdecode_time=t*0.000001f; video_time_usage+=vdecode_time;
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> 
>     /*Output quality adjustments:*/
>     /*If we took a long time decoding this frame, downgrade the quality.*/
>     if(output_quality>0&&
>        (video_time_usage-cvideo_base_vtime)*v_frame>=
>        (0.95*v_frame-(vout_time_usage+audio_time_usage))*
>        (v_frame-cvideo_base_vframe-frame_correction)){
>         output_quality>>=1;
>         /*printf("\nDowngrading quality to %i.\n",output_quality);*/
>         switch(sh_video->codec->driver){
>             case 3:{ /*OpenDivX*/
>                 DEC_SET dec_set;
>                 dec_set.postproc_level=(1<<output_quality)-1;
>                 decore(0x123,DEC_OPT_SETPP,&dec_set,NULL);
>             }break;
> #ifdef USE_DIRECTSHOW
>             case 4:{ /*W32/DirectShow*/
>                 DS_SetValue_DivX("Quality",output_quality>4?4:output_quality);
>             }break;
> #endif
>             /*case 1: ??*/
>             case 2:{
>                 picture->pp_options=(1<<output_quality)-1;
>             }break;
>         }
>     }
>     /*If we had plenty of extra time, upgrade the quality.*/
>     else if(output_quality<divx_quality&&
>             vdecode_time<0.50f*frame_time&&
>             (video_time_usage-cvideo_base_vtime)*v_frame<
>             (0.67*v_frame-(vout_time_usage+audio_time_usage))*
>             (v_frame-cvideo_base_vframe-frame_correction)){
>         output_quality++;
>         /*printf("\nUpgrading quality to %i.\n",output_quality);*/
>         switch(sh_video->codec->driver){
>             case 3:{ /*OpenDivX*/
>                 DEC_SET dec_set;
>                 dec_set.postproc_level=(1<<output_quality)-1;
>                 decore(0x123,DEC_OPT_SETPP,&dec_set,NULL);
>             }break;
> #ifdef USE_DIRECTSHOW
>             case 4:{ /*W32/DirectShow*/
>                 DS_SetValue_DivX("Quality",output_quality>4?4:output_quality);
>             }break;
> #endif
>             /*case 1: ??*/
>             case 2:{
>                 picture->pp_options=(1<<output_quality)-1;
>             }break;
>         }
>     }