[MPlayer-dev-eng] [PATCH] Automatic downmix

[ubitux]

Hi,

Videos with Flac 5.1 audio streams are more and more common, but there is
no automatic downmix in this codec, so a lot of people (me first) expect
issues with headphones…

So here is a small patch to automatically call hrtf filter if needed.  I
don't know if it's the correct place to do that but I didn't found a
better place.

Also, hrtf is just as proof of concept; maybe a "pan" audio filter is more
appropriated, but settings need to be discussed (I got a lot of saturation
with hrtf filter).

Well anyway, the patch is attached to the mail, so if anyone can make
review/proposition/etc…

Regards,

-- 
ubitux
-------------- next part --------------
Index: mplayer.c
===================================================================
--- mplayer.c	(revision 31950)
+++ mplayer.c	(working copy)
@@ -1706,6 +1706,11 @@
     }
     mpctx->mixer.audio_out = mpctx->audio_out;
     mpctx->mixer.volstep = volstep;
+
+    /* Automatic downmix in case the codec does not implement it */
+    if (audio_output_channels == 2 && mpctx->sh_audio->channels > 2)
+        af_add(mpctx->mixer.afilter, "hrtf");
+
     return;
 
 init_error: