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Streams using NumPy Arrays — python-sounddevice, version 0.4.1
https://python-sounddevice.readthedocs.io/en/0.4.1/api/streams.html#:~:text=When%20a%20stream%20is%20running%2C%20PortAudio%20calls%20the,stream%20will%20be%20opened%20in%20%E2%80%9Cblocking%20read%2Fwrite%E2%80%9D%20mode.
c++ - Portaudio Callback Function Example - Stack Overflow
https://stackoverflow.com/questions/26172522/portaudio-callback-function-example
I'm currently building an mp3 streamer/receiver with the use of live555, mpg123 and portaudio, and just starting the concepts of streaming, decoding and playing mp3. My problem is when I need to play the sound with portaudio. I can't figure how to write a callback function that will play my decoded mp3.
PortAudio: PaStreamCallbackTimeInfo Struct Reference
http://www.portaudio.com/docs/v19-doxydocs/structPaStreamCallbackTimeInfo.html
Timing information for the buffers passed to the stream callback. Time values are expressed in seconds and are synchronised with the time base used by Pa_GetStreamTime() for the associated stream. See Also PaStreamCallback, Pa_GetStreamTime. Definition at …
PortAudio: Writing a Callback Function
http://www.portaudio.com/docs/v19-doxydocs/writing_a_callback.html
The "callback" is a function that is called by the PortAudio engine whenever it has captured audio data, or when it needs more audio data for output. Before we begin, it's important to realize that the callback is a delicate place. This is because some systems perform the callback in a special thread, or interrupt handler, and it is rarely ...
PortAudio: PaStreamCallbackTimeInfo Struct Reference
http://files.portaudio.com/docs/v19-doxydocs/structPaStreamCallbackTimeInfo.html
Timing information for the buffers passed to the stream callback. Time values are expressed in seconds and are synchronised with the time base used by Pa_GetStreamTime() for the associated stream. See Also PaStreamCallback, Pa_GetStreamTime. Definition at …
PortAudio: Starting, Stopping and Aborting a Stream
http://www.portaudio.com/docs/v19-doxydocs/start_stop_abort.html
PortAudio will continue to call your callback and process audio until you stop the stream. This can be done in one of several ways, but, before we do so, we'll want to see that some of our audio gets processed by sleeping for a few seconds.
PortAudio: Utility Functions
http://files.portaudio.com/docs/v19-doxydocs/utility_functions.html
Stream State. PortAudio Streams exist in 3 states: Active, Stopped, and Callback Stopped. If a stream is in callback stopped state, you'll need to stop it before you can start it again. If you need to query the state of a PortAudio stream, there are two functions for doing so:
PortAudio: Opening a Stream Using Defaults
http://www.portaudio.com/docs/v19-doxydocs/open_default_stream.html
PortAudio. The next step is to open a stream, which is similar to opening a file. You can specify whether you want audio input and/or output, how many channels, the data format, sample rate, etc. Opening a ''default'' stream means opening the default input and output devices, which saves you the trouble of getting a list of devices and choosing ...
PortAudio: PortAudio Tutorials
http://portaudio.com/docs/v19-doxydocs/tutorial_start.html
Write a callback function that will be called by PortAudio when audio processing is needed. Initialize the PA library and open a stream for audio I/O. Start the stream. Your callback function will be now be called repeatedly by PA in the background. In your callback you can read audio data from the inputBuffer and/or write data to the outputBuffer.
Streams using NumPy Arrays — python-sounddevice, version 0.4.4
https://python-sounddevice.readthedocs.io/en/0.4.4/api/streams.html
The PortAudio stream callback runs at very high or real-time priority. It is required to consistently meet its time deadlines. Do not allocate memory, access the file system, call library functions or call other functions from the stream callback that may block or take an unpredictable amount of time to complete.
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