Add the indevs.texi and outdevs.texi files.

Originally committed as revision 24543 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/outdevs.texi

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+@chapter Output Devices
+@c man begin OUTPUT DEVICES
+
+Output devices are configured elements in FFmpeg which allow to write
+multimedia data to an output device attached to your system.
+
+When you configure your FFmpeg build, all the supported output devices
+are enabled by default. You can list them using the configure option
+"--list-outdevs".
+
+You can disable all the output devices using the configure option
+"--disable-outdevs", and selectively enable an output device using the
+option "--enable-outdev=@var{OUTDEV}", or you can disable a particular
+input device using the option "--disable-outdev=@var{OUTDEV}".
+
+The option "-formats" of the ff* tools will display the list of
+enabled output devices (amongst the muxers).
+
+A description of the currently available output devices follows.
+
+@section alsa
+
+ALSA (Advanced Linux Sound Architecture) output device.
+
+@section audio_beos
+
+BeOS audio output device.
+
+@section oss
+
+OSS (Open Sound System) output device.
+
+@c man end OUTPUT DEVICES