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Since libavcodec doesn't have a "generic" PCM decoder, we have to go out of out way to make it look like ad_lavc provides one: make it provide a pseudo "pcm" decoder, which maps some format tags manually to the individual libavcodec PCM decoders. Format tags which uniquely map to one libavcodec could be mapped via codecs.conf. Since defining these in tag_map[] is much shorter (one line vs. a full codec entry in codecs.conf), and since we need tag_map[] anyway, we don't use codecs.conf for these. ad_pcm is evil because it still does partial packet reads (with demux_read_data()), and it's redundant to libavcodec anyway.
Compiling with full features requires development files for several external libraries. Below is a list of some important requirements. For more information see the output of './configure --help' for a list of options, or look at the list of enabled and disabled features printed after running './configure'. If you think you have support for some feature installed but configure fails to detect it, the file config.log may contain information about the reasons for the failure. Libraries specific to particular video output methods (you'll want at least one of VDPAU, GL or Xv): - libvdpau (for VDPAU output, best choice for NVIDIA cards) - libGL (OpenGL output) - libXv (XVideo output) general: - libasound (ALSA audio output) - various general X development libraries - libfreetype (for libass) - libfontconfig (for libass) - libass - FFmpeg libraries (libavutil libavcodec libavformat libswscale libpostproc) Most of the above libraries are available in suitable versions on normal Linux distributions. However FFmpeg is an exception (distro versions may be too old to work at all or work well). For that reason you may want to use the separately available build wrapper that first compiles FFmpeg libraries and libass, and then compiles the player statically linked against those.