Enable platform-specific features from PortAudio #4

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1. mgeier commented on Jul 29, 2015

   

   mgeier

   on Jul 29, 2015

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   One possible feature would be the "exclusive mode" of WASAPI, see http://stackoverflow.com/questions/31306010/how-to-enable-wasapi-exclusive-mode-in-pyaudio
2. mgeier commented on Mar 20, 2016

   

   mgeier

   on Mar 20, 2016

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   PaAlsa_EnableRealtimeScheduling might be interesting for ALSA: http://portaudio.com/docs/v19-doxydocs-dev/pa__linux__alsa_8h.html#accc41e7fd89dc0a6163d54a4f25fb242
3. raecke commented on Aug 8, 2016

   

   raecke

   on Aug 8, 2016

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   It would be interesting to be able to select arbitrary channels for input and output. On Windows this is needed with ASIO. If you currently want to send data to output channels 9 and 10, you have to send data to all channels below 11. This means that sharing the soundcard with other applications becomes impossible.

   The hostapis WDM-KS, MME, Directsound, normally only present 2 channels so it is not a problem there.
4. mgeier

   added a commit that references this issue on Aug 9, 2016

   WIP: Add extra_settings and AsioSettings

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   1c60f1f
5. mgeier commented on Aug 9, 2016

   

   mgeier

   on Aug 9, 2016

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   @raecke I created an experimental implementation in #34. Can you please check if it works for you and leave a comment there?
6. mgeier

   added a commit that references this issue on Aug 10, 2016

   Add extra_settings and AsioSettings

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   479352c
7. mgeier

   added a commit that references this issue on Aug 25, 2016

   Add extra_settings and AsioSettings

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   1e16a3a
8. mgeier commented on Jan 28, 2017

   

   mgeier

   on Jan 28, 2017

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   There is also PaAlsa_SetNumPeriods, which is by default set to 4, which seems random:

   By default the number of periods is 4, this is the lowest number of periods that works well on the author's soundcard.

   http://portaudio.com/docs/v19-doxydocs-dev/pa__linux__alsa_8h.html#a76f60d6f1ba6a298c038a9f3a6dccc53

   It looks like this has to be called before opening a stream.
9. mgeier commented on Apr 28, 2017

   

   mgeier

   on Apr 28, 2017

   Last edited by mgeier

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   OK, I'm trying to make an exhaustive list of the current host-API-specific settings, let's see if that works:

   hostApiSpecificStreamInfo to be specified separately for the input and output device when creating a stream:

   • PaAlsaStreamInfo::deviceString, only works if device index is set to paUseHostApiSpecificDeviceSpecification (a.k.a. -2)
   • PaAsioStreamInfo::channelSelectors, needs PaAsioStreamInfo::flags to contain paAsioUseChannelSelectors
   • PaMacCoreStreamInfo::channelMap, can be set with PaMacCore_SetupChannelMap
   • PaMacCoreStreamInfo::flags, paMacCoreChangeDeviceParameters, paMacCoreFailIfConversionRequired, paMacCoreConversionQuality*, ...
   • PaWinDirectSoundStreamInfo::channelMask, needs paWinDirectSoundUseChannelMask flag
   • PaWinDirectSoundStreamInfo::framesPerBuffer, needs paWinDirectSoundUseLowLevelLatencyParameters flag
   • PaWasapiStreamInfo::channelMask, needs paWinWasapiUseChannelMask flag
   • PaWasapiStreamInfo::flags, paWinWasapiExclusive, paWinWasapiPolling
   • PaWasapiStreamInfo::hostProcessorOutput, needs paWinWasapiRedirectHostProcessor flag, separate callback instead of "normal" audio callback?
   • PaWasapiStreamInfo::hostProcessorInput
   • PaWasapiStreamInfo::threadPriority, needs paWinWasapiThreadPriority flag, cannot be different for input and output!
   • PaWasapiStreamInfo::streamCategory
   • PaWasapiStreamInfo::streamOption
   • PaWDMKSSpecificStreamInfo::input ???
   • PaWDMKSSpecificStreamInfo::output ???
   • PaWinWDMKSInfo::channelMask ???
   • PaWinWDMKSInfo::flags ???
   • PaWinMmeStreamInfo::framesPerBuffer
   • PaWinMmeStreamInfo::bufferCount
   • PaWinMmeStreamInfo::devices, needs paWinMmeUseMultipleDevices flag
   • PaWinMmeStreamInfo::channelMask, needs paWinMmeUseChannelMask flag
   • PaWinMmeStreamInfo::flags: paWinMmeDontThrottleOverloadedProcessingThread, paWinMmeWaveFormatDolbyAc3Spdif, paWinMmeWaveFormatWmaSpdif

   Functions that are called with a stream pointer:

   • PaAlsa_EnableRealtimeScheduling
   • PaAlsa_GetStreamInputCard
   • PaAlsa_GetStreamOutputCard
   • PaAsio_SetStreamSampleRate
   • PaMacCore_GetStreamInputDevice
   • PaMacCore_GetStreamOutputDevice
   • PaWasapi_GetFramesPerHostBuffer, for use with PaWasapiHostProcessorCallback
   • PaWinMME_GetStreamInputHandle
   • PaWinMME_GetStreamOutputHandle

   Global functions:

   • PaAlsa_SetNumPeriods
   • PaAlsa_SetRetriesBusy
   • PaAlsa_SetLibraryPathName Does this work with the way we are loading the library?
   • PaAsio_GetAvailableBufferSizes, takes the device index
   • PaAsio_ShowControlPanel, takes the device index and "the calling application's main window handle", does this work in Python?
   • PaAsio_GetInputChannelName, takes the device index
   • PaAsio_GetOutputChannelName, takes the device index
   • PaJack_SetClientName, must be called before Pa_Initialize!
   • PaJack_GetClientName
   • PaMacCore_GetChannelName, takes device and channel index
   • PaMacCore_GetBufferSizeRange, takes device index
   • PaWasapi_GetDeviceDefaultFormat, takes device index
   • PaWasapi_GetDeviceRole, takes device index
   • PaWasapi_ThreadPriorityBoost, for blocking interface only
   • PaWasapi_ThreadPriorityRevert
   • PaWasapi_GetJackCount, takes device index
   • PaWasapi_GetJackDescription, takes device index
   • PaWasapi_IsLoopback (will be in PortAudio 19.8), takes device index
10. philipmountifield commented on May 19, 2020

    

    philipmountifield

    on May 19, 2020

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    Would love to be able to fetch PaAsio_GetInputChannelName and PaAsio_GetOutputChannelName though it looks like there hasn't been much movement on this feature?
11. mgeier commented on May 20, 2020

    

    mgeier

    on May 20, 2020

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    @philipmountifield Can you please create a new issue with your request, including a suggestion how the new API should look like?