[LAU] Using your Nokia N9/N950 as a Dolby surround processor

[[ Orig from http://forum.meego.com/showthread.php?t=5233&page=2 ]] In http://karoliinamaemoblog.blogspot.com/2011/12/how-to-use-nokia-n9-as-music… "How to use Nokia N9 as music production tool - encoding your sequencer's tracks with Dolby Headphone using the Nokia N9" I found the following gem: ............... gst-launch filesrc location=input.wav ! decodebin ! nokiadhmmix ! wavenc ! filesink location=output.wav ................... ~ $ gst-inspect-0.10 | grep mix pulseaudio: pulsemixer: PulseAudio Mixer nokiadhmmix: nokiadhmmix: Dolby Headphones Mobile mixer videomixer: videomixer2: Video mixer 2 videomixer: videomixer: Video mixer .................. Anybody know whether this can be used to be able to mix and position soundsources in the headphones and how effective it is? Seems like it would significantly offload CPU in music apps on the handset if they could use the DSP to do some rudimentary mixing, unless you have to waste a bunch of CPU packing separate audio streams into a single multichannel just to get it mixed back to stereo via the DSP.... ............... ~ $ gst-inspect-0.10 nokiadhmmix Factory Details: Long name: Dolby Headphones Mobile mixer Class: Filter/Effect/Audio Description: Nokia AC-3/e-AC-3 decoder Author(s): Nokia Corporation <multimedia(a)maemo.org> Rank: primary (256) Plugin Details: Name: nokiadhmmix Description: Nokia Dolby Headphones Mobile Filename: /usr/lib/gstreamer-0.10/libgstnokiadhmmix.so Version: 0.10.0 License: Proprietary Source module: gst-nokia-dolby Binary package: gst-nokia-dolby-mobile Origin URL: GObject +----GstObject +----GstElement +----GstNokiaDhmMix Pad Templates: SINK template: 'sink' Availability: Always Capabilities: audio/x-raw-int endianness: 1234 width: 16 depth: 16 signed: true rate: [ 8000, 48000 ] channels: [ 1, 6 ] SRC template: 'src' Availability: Always Capabilities: audio/x-raw-int endianness: 1234 width: 16 depth: 16 signed: true rate: [ 8000, 48000 ] channels: 2 Element Flags: no flags set Element Implementation: Has change_state() function: 0x3ab1331c Has custom save_thyself() function: 0x3ab134e8 Has custom restore_thyself() function: 0x3ab0f9d8 Element has no clocking capabilities. Element has no indexing capabilities. Element has no URI handling capabilities. Pads: SRC: 'src' Implementation: Has custom eventfunc(): 0x3ab27968 Has custom queryfunc(): 0x3ab231cc Has custom iterintlinkfunc(): 0x3ab22cec Has getcapsfunc(): 0x3ab4dd28 Has acceptcapsfunc(): 0x3ab236d8 Pad Template: 'src' SINK: 'sink' Implementation: Has chainfunc(): 0x3b0ba7b8 Has custom eventfunc(): 0x3b0b9bbc Has custom queryfunc(): 0x3ab231cc Has custom iterintlinkfunc(): 0x3ab22cec Has getcapsfunc(): 0x3b0b9e08 Has setcapsfunc(): 0x3b0b9868 Has acceptcapsfunc(): 0x3ab236d8 Pad Template: 'sink' Element Properties: name : The name of the object flags: readable, writable String. Default: null Current: "nokiadhmmix0" mobile-surround : Enable MobileSurround flags: readable, writable Enum "GstNokiaDhmMixMsr" Default: 1, "on" Current: 1, "on" (0): off - Off (1): on - On (2): auto - Auto (on for multichannel streams, off for mono/stereo) mobile-surround-applied: Indicate current MSR status flags: readable Boolean. Default: false Current: false brightness : MobileSurround timbre effect flags: readable, writable Integer. Range: 0 - 4 Default: 2 Current: 2 room-size : MobileSurround envelope effect flags: readable, writable Integer. Range: 0 - 4 Default: 0 Current: 0 stereo-matrix-pl2 : Process stereo input as Pro-Logic II encoded flags: readable, writable Boolean. Default: true Current: true -- Niels http://nielsmayer.com PS: Also interesting: http://lists.maemo.org/pipermail/maemo-developers/2011-December/028767.html --> http://code.google.com/p/gst-dsp/