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N900 Hardware Audio Codec - maemo.org wiki
https://wiki.maemo.org/N900_Hardware_Audio_Codec
The audio codec is driven by pulseaudio, through ALSA. The ALSA interface is usually not exposed in maemo 5 - adding: pcm.real { type hw card 0 } ctl.real { type hw card 0 } to /etc/asound.conf enables a hardware device. Stopping pulseaudio may be required to use this. Kernel. The codec is driven by a driver built into the kernel.
maemo.org - Maemo 3.x: Multimedia Architecture
http://maemo.org/development/documentation/manuals/3-x/multimedia_architecture/
Raw PCM audio: dsppcmsink, dsppcmsrc: MP2: DSP: MPEG-1 audio layer-2: dspmp3sink: MP3: DSP: MPEG-1 audio layer-3: dspmp3sink: AAC: DSP: Advanced Audio Coding, only LC and LTP profiles supported: dspaacsink: AMR-NB: DSP: Adaptive Multi-Rate narrowband: dspamrsink: AMR-WB: DSP: Adaptive Multi-Rate wideband: dspamrsink: IMA ADPCM: CPU: Adaptive …
Video encoding - maemo.org wiki
http://wiki.maemo.org/Video_encoding
Extra Audio Codecs . It is possible to add extra audio codec support to the N900 by installing the Decoders Support package from Maemo Extras. AC3 . The Decoders Support package adds AC3 audio support. AC3 audio is interesting because most DVD audio tracks are encoded in this format. This would allow you to copy the audio track without transcoding it.
maemo.org - Maemo 5 Beta Docs: Using Multimedia …
http://maemo.org/development/sdks/maemo_5_beta_docs/using_multimedia_components/
Maemo devices include a wide arsenal of video and audio codecs, which enable the maemo applications to read and write nearly all commonly used video and audio formats. These are supported also by the GStreamer framework.
[N900] problem - mp4 - codecs - maemo.org - Talk
https://talk.maemo.org/showthread.php?t=44461&goto=newpost
Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding) AUDIO: 22050 Hz, 2 ch, s16le, 96.0 kbit/13.60% (ratio: 11999->88200) Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio))
Documentation/Maemo 5 Developer Guide/Architecture ...
https://wiki.maemo.org/Documentation/Maemo_5_Developer_Guide/Architecture/Multimedia_Domain
In addition, Audio Post-Processor is always enabled. It needs different tunings for IHF, wired headset (assumed to be HS-48 like), BT headset and generic headphone. Alarm is played through the loudspeaker even if headphones are connected and can’t be mixed to other sounds. This is a UI requirement. Audio Codecs
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