you can use chmap to query the channel map

http://git.alsa-project.org/?p=alsa-
lib.git;a=blob_plain;f=test/chmap.c;hb=HEAD

control.45 {
                iface PCM
                name 'Playback Channel Map'
                value.0 0
                value.1 0
                value.2 0
                value.3 0
                value.4 0
                value.5 0
                value.6 0
                value.7 0
                comment {
                        access read
                        type INTEGER
                        count 8
                        range '0 - 36'
                }
        }
        
        control.47 {
                iface PCM
                device 1
                name 'Playback Channel Map'
                value.0 0
                value.1 0
                comment {
                        access read
                        type INTEGER
                        count 2
                        range '0 - 36'
                }
        }
        
        control.54 {
                iface PCM
                device 3
                name 'Playback Channel Map'
                value.0 0
                value.1 0
                comment {
                        access read
                        type INTEGER
                        count 2
                        range '0 - 36'
                }
        }

post pulseaudio verbose log when you play AC3 5.1 DVD to your spdif or
hdmi

you can find the channel matrix

https://wiki.ubuntu.com/PulseAudio/Log‎

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https://bugs.launchpad.net/bugs/1249705

Title:
  HDMI output not available in 13.10

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