Fix PortAudio backend #7444
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Fix PortAudio backend #7444
+167
−435
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If PortAudio is not found, then nothing should be defined here anyways.
We should do this for any of the other applicable audio devices in the future (to encourage separation of GUI and Core).
Returning paComplete from the audio callback, as well as using our own stop variable may conflict in complex ways. One such example is if the stop boolean is set and the device is required to read the nullptr buffer when the audio FIFO thread is closing. Also, PortAudio's says using paComplete and paAbort is an alternative technique to calling Pa_StopStream, so using both isn't necessary and thus avoids streams being stopped or started unexpectedly.
Made a misunderstanding. Pa_StopStream requires that we return paComplete when we are done to tell it that no more new buffers are being rendered for now and it can play any pending audio buffers.
No need for AudioEngine::clip since PortAudio already clips the signal for us.
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How does one test this? Should I play two demo tracks and look at the latency? |
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Here's my config, @sakertooth, with recent files and directory paths obscured: <?xml version="1.0"?>
<!DOCTYPE lmms-config-file>
<lmms version="1.3.0-alpha.1.740+g303215f8b" configversion="3">
<MidiJack device="lmms"/>
<app loopmarkermode="dual" nanhandler="1" openlastproject="0" nommpz="0" sololegacybehavior="0" configured="1" displaydbfs="1" disablebackup="0" language="sr"/>
<audioengine mididev="WinMM MIDI" framesperaudiobuffer="256" audiodev="SDL (Simple DirectMedia Layer)"/>
<audiojack clientname="lmms" channels="2"/>
<audioportaudio backend="" device=""/>
<audiosdl inputdevice="" device=""/>
<midi midiautoassign="none" autoquantize="0"/>
<paths ladspadir="..." workingdir="..." stkdir="data:/stk/rawwaves/" defaultsf2="..." sf2dir="..." vstdir="..." theme="data:/themes/default/" backgroundtheme="" gigdir="..."/>
<tooltips disabled="0"/>
<ui saveinterval="2" enablerunningautosave="0" displaywaveform="1" vstembedmethod="none" animateafp="1" smoothscroll="0" sidebaronright="0" trackdeletionwarning="0" printnotelabels="1" mixerchanneldeletionwarning="1" compacttrackbuttons="0" disableautoquit="0" vstalwaysontop="0" oneinstrumenttrackwindow="0" enableautosave="0" letpreviewsfinish="0"/>
<recentfiles>
...
</recentfiles>
</lmms> |
Not strictly needed, given that audio recording is not fully implemented, and is causing issues starting up PortAudio
…e and channel count when backend changes
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Applies various changes in an attempt to resolve certain issues with the PortAudio backend and improve the quality of the code.
Intended to fix #5383.