[FFmpeg-devel] [PATCH] Add debug facilities for avfilter.c

Stefano Sabatini stefano.sabatini-lala
Mon Oct 5 21:34:50 CEST 2009


On date Monday 2009-10-05 00:32:40 +0200, Michael Niedermayer encoded:
> On Sun, Oct 04, 2009 at 06:40:12PM +0200, Stefano Sabatini wrote:
> > Hi all,
> > 
> > these trace messages can be a real pain-saver when debugging complex
> > filterchains, while I believe they don't clutter the code so much.
> > 
> > The result in the output is something like:
> > avfilter_request_frame(): link[0x8f8f410 w:564 h:348 src:vflip dst:ffplay_output]: requesting frame
> > avfilter_request_frame(): link[0x8f8f350 w:564 h:348 src:hflip dst:vflip]: requesting frame
> > avfilter_request_frame(): link[0x8f8f070 w:564 h:348 src:pad dst:hflip]: requesting frame
> > avfilter_request_frame(): link[0x8f8ede0 w:464 h:348 src:ffplay_input dst:pad]: requesting frame
> > avfilter_get_video_buffer(): link[0x8f8ede0 w:464 h:348 src:ffplay_input dst:pad]: getting picref [w:464 h:348]
> > avfilter_get_video_buffer(): link[0x8f8f070 w:564 h:348 src:pad dst:hflip]: getting picref [w:564 h:348]
> > avfilter_get_video_buffer(): link[0x8f8f350 w:564 h:348 src:hflip dst:vflip]: getting picref [w:564 h:348]
> > avfilter_get_video_buffer(): link[0x8f8f410 w:564 h:348 src:vflip dst:ffplay_output]: getting picref [w:564 h:348]
> > avfilter_get_video_buffer(): link[0x8f8f410 w:564 h:348 src:vflip dst:ffplay_output]: returning picref: picref[data[0x97d16f0, 0x98025f0, 0x980e9b0, (nil)] linesize[576, 288, 288, 0] pts:0 564x348]
> > avfilter_get_video_buffer(): link[0x8f8f350 w:564 h:348 src:hflip dst:vflip]: returning picref: picref[data[0x98023b0, 0x980e890, 0x981ac50, (nil)] linesize[-576, -288, -288, 0] pts:0 564x348]
> > avfilter_get_video_buffer(): link[0x8f8f070 w:564 h:348 src:pad dst:hflip]: returning picref: picref[data[0x98023b0, 0x980e890, 0x981ac50, (nil)] linesize[-576, -288, -288, 0] pts:0 564x348]
> > avfilter_get_video_buffer(): link[0x8f8ede0 w:464 h:348 src:ffplay_input dst:pad]: returning picref: picref[data[0x98023b0, 0x980e890, 0x981ac50, (nil)] linesize[-576, -288, -288, 0] pts:0 564x348]
> > avfilter_start_frame(): link[0x8f8ede0 w:464 h:348 src:ffplay_input dst:pad]: starting frame picref[data[0x98023b0, 0x980e890, 0x981ac50, (nil)] linesize[-576, -288, -288, 0] pts:800000 564x348]
> > avfilter_start_frame(): link[0x8f8f070 w:564 h:348 src:pad dst:hflip]: starting frame picref[data[0x98023b0, 0x980e890, 0x981ac50, (nil)] linesize[-576, -288, -288, 0] pts:800000 564x348]
> > avfilter_get_video_buffer(): link[0x8f8f350 w:564 h:348 src:hflip dst:vflip]: getting picref [w:564 h:348]
> > avfilter_get_video_buffer(): link[0x8f8f410 w:564 h:348 src:vflip dst:ffplay_output]: getting picref [w:564 h:348]
> > avfilter_get_video_buffer(): link[0x8f8f410 w:564 h:348 src:vflip dst:ffplay_output]: returning picref: picref[data[0x9864450, 0x9895350, 0x98a1710, (nil)] linesize[576, 288, 288, 0] pts:0 564x348]
> > avfilter_get_video_buffer(): link[0x8f8f350 w:564 h:348 src:hflip dst:vflip]: returning picref: picref[data[0x9895110, 0x98a15f0, 0x98ad9b0, (nil)] linesize[-576, -288, -288, 0] pts:0 564x348]
> > avfilter_start_frame(): link[0x8f8f350 w:564 h:348 src:hflip dst:vflip]: starting frame picref[data[0x9895110, 0x98a15f0, 0x98ad9b0, (nil)] linesize[-576, -288, -288, 0] pts:800000 564x348]
> > avfilter_start_frame(): link[0x8f8f410 w:564 h:348 src:vflip dst:ffplay_output]: starting frame picref[data[0x9864450, 0x9895350, 0x98a1710, (nil)] linesize[576, 288, 288, 0] pts:800000 564x348]
> > avfilter_draw_slice(): link[0x8f8ede0 w:464 h:348 src:ffplay_input dst:pad]: drawing slice y:0 h:348
> > avfilter_draw_slice(): link[0x8f8f070 w:564 h:348 src:pad dst:hflip]: drawing slice y:0 h:348
> > avfilter_draw_slice(): link[0x8f8f350 w:564 h:348 src:hflip dst:vflip]: drawing slice y:0 h:348
> > avfilter_draw_slice(): link[0x8f8f410 w:564 h:348 src:vflip dst:ffplay_output]: drawing slice y:0 h:348
> 
> "avfilter_" unneeded, so is ()
> w:X h:Y -> s:XxY
> src:vflip dst:ffplay_output ->  vflip->ffplay_output

Now is:

request_frame: link[0x9740db0 s:464x348 crop->ffplay_output]
request_frame: link[0x9740d10 s:464x348 vflip->crop]
request_frame: link[0x9733020 s:464x348 ffplay_input->vflip]
get_video_buffer: link[0x9733020 s:464x348 ffplay_input->vflip] perms:2 w:464 h:348
get_video_buffer: link[0x9740d10 s:464x348 vflip->crop] perms:2 w:464 h:348
get_video_buffer: link[0x9740db0 s:464x348 crop->ffplay_output] perms:2 w:464 h:348
get_video_buffer: link[0x9740db0 s:464x348 crop->ffplay_output] returning picref[0x96f8e90 data[0x9891ca0, 0x98b9360, 0x98c3680, (nil)] linesize[464, 240, 240, 0] pts:0 s:464x348]
get_video_buffer: link[0x9740d10 s:464x348 vflip->crop] returning picref[0x96f8e90 data[0x9891ca0, 0x98b9360, 0x98c3680, (nil)] linesize[464, 240, 240, 0] pts:0 s:464x348]
get_video_buffer: link[0x9733020 s:464x348 ffplay_input->vflip] returning picref[0x96f8e90 data[0x98b9190, 0x98c3590, 0x98cd8b0, (nil)] linesize[-464, -240, -240, 0] pts:0 s:464x348]
start_frame: link[0x9733020 s:464x348 ffplay_input->vflip] picref[0x9726590 data[0x98b9190, 0x98c3590, 0x98cd8b0, (nil)] linesize[-464, -240, -240, 0] pts:6433333 s:464x348]
start_frame: link[0x9740d10 s:464x348 vflip->crop] picref[0x9732dd0 data[0x9891ca0, 0x98b9360, 0x98c3680, (nil)] linesize[464, 240, 240, 0] pts:6433333 s:464x348]
start_frame: link[0x9740db0 s:464x348 crop->ffplay_output] picref[0x9733070 data[0x9891ca0, 0x98b9360, 0x98c3680, (nil)] linesize[464, 240, 240, 0] pts:6433333 s:464x348]
draw_slice: link[0x9733020 s:464x348 ffplay_input->vflip] y:0 h:348
draw_slice: link[0x9740d10 s:464x348 vflip->crop] y:0 h:348
draw_slice: link[0x9740db0 s:464x348 crop->ffplay_output] y:0 h:348

> and the stuf above would be more readable if you could do something about
> variable size fields so that things are vertically aligned

I tried different times to align, that usually resulted in a bigger
mess than before and it tends to waste space, we could still
grep|print|format|cut if necessary.

> > By default they are completely disabled, to enable them is sufficient to
> > de-comment the DEBUG symbol definition.
> > 
> > Regards.
> > -- 
> > FFmpeg = Funny and Fast Merciful Picky Enhancing Gospel
> 
> >  avfilter.c |   47 +++++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 47 insertions(+)
> > 16de016cde39d4efe4f8e30d00314ca8d7afa5da  debug-system.patch
> > Index: ffmpeg-vfilters/ffmpeg/libavfilter/avfilter.c
> > ===================================================================
> > --- ffmpeg-vfilters.orig/ffmpeg/libavfilter/avfilter.c	2009-10-04 17:47:08.000000000 +0200
> > +++ ffmpeg-vfilters/ffmpeg/libavfilter/avfilter.c	2009-10-04 18:30:15.000000000 +0200
> > @@ -22,6 +22,8 @@
> >  #include "libavcodec/imgconvert.h"
> >  #include "avfilter.h"
> >  
> > +/* #define DEBUG */
> > +
> >  unsigned avfilter_version(void) {
> >      return LIBAVFILTER_VERSION_INT;
> >  }
> > @@ -160,10 +162,29 @@
> >      return 0;
> >  }
> >  
> > +#define DPRINT_PICREF(dst, dst_size, picref) snprintf(dst, dst_size,    \
> > +                                                      "picref[data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" %dx%d]", \
> > +                                                      picref->data[0], picref->data[1], picref->data[2], picref->data[3], \
> > +                                                      picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3], \
> > +                                                      picref->pts, picref->w, picref->h)
> > +
> > +#define DPRINT_LINK(dst_, dst_size_, link_) snprintf(dst_, dst_size_,   \
> > +                                                     "link[%p w:%d h:%d src:%s dst:%s]", link_, link_->w, link_->h, \
> > +                                                     link_->src ? link_->src->filter->name : "", \
> > +                                                     link_->dst ? link_->dst->filter->name : "")
> > +
> 
> these could be functions

Implemented as functions.

> >  AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
> >  {
> >      AVFilterPicRef *ret = NULL;
> >  
> > +#ifdef DEBUG
> > +    char picref_buf[256], link_buf[256];
> > +
> > +    DPRINT_LINK(link_buf, sizeof(link_buf), link);
> > +    av_log(NULL, AV_LOG_DEBUG, "%s(): %s: getting picref [w:%d h:%d]\n",
> > +           __func__, link_buf, w, h);
> > +#endif
> 
> the buffers and snprintf() are useless, a single av_log call is enough

How? I'd like to keep the dprint_STUFF functions, so it's easy to
add/customize other traces in other places if necessary.

Regards.
-- 
FFmpeg = Frenzy and Fundamentalist Monstrous Peaceless Enhancing Guru
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