Set pulseaudio channel map to WAVE-EX
Pulseaudio expects clients to specify their channel-map if the default (ALSA) map does not route the audio to the expected speakers. Many Google results suggest dealing with this by re-routing the audio channels with the appropriate ALSA plugin, but this will then simply break any clients which expect the default ALSA mapping. Virtually all media files and codecs, certainly flac, dca, a52, and of course anything based on Microsoft's WAVEFORMAT_EXTENSIBLE specification, assume the layout in the table here: http://en.wikipedia.org/wiki/Surround_sound#Standard_speaker_channels Fortunately, pulseaudio directly addresses this with a built-in channel map for WAVE-EX which can be set automatically in the stream sample-spec.
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NEWS
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NEWS
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@ -1,4 +1,6 @@
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ver 0.20 (not yet released)
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* output
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- pulse: set channel map to WAVE-EX
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ver 0.19.2 (not yet released)
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* decoder
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@ -523,7 +523,11 @@ pulse_output_setup_stream(PulseOutput *po, const pa_sample_spec *ss,
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assert(po != nullptr);
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assert(po->context != nullptr);
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po->stream = pa_stream_new(po->context, po->name, ss, nullptr);
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/* WAVE-EX is been adopted as the speaker map for most media files */
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pa_channel_map chan_map;
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pa_channel_map_init_auto(&chan_map, ss->channels,
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PA_CHANNEL_MAP_WAVEEX);
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po->stream = pa_stream_new(po->context, po->name, ss, &chan_map);
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if (po->stream == nullptr) {
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SetError(error, po->context, "pa_stream_new() has failed");
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return false;
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