Guide to use PYSDL2 to achieve audio playback and processing

Guide to use PYSDL2 to achieve audio playback and processing PYSDL2 is a Python binding library for SDL2 (Simple DirectMedia Layer), which provides a simple and powerful way to handle audio playback.This guide will introduce how to use PYSDL2 to achieve audio playback and processing. Step 1: Install PYSDL2 and SDL2 First, you need to install PYSDL2 and SDL2.You can use PIP to install PYSDL2, but you need to install SDL2, you need to download and compile it manually.For detailed installation instructions for SDL2, please refer to the official documentation or related tutorials. Step 2: Import the required library At the beginning of the Python code, we need to import the required library: import sdl2 import sdl2.ext Step 3: Initialize SDL2 Before starting to use SDL2, we need to initialize it: sdl2.ext.init() Step 4: Create audio equipment We can use the following code to create an audio device: spec = sdl2.audio.SDL_AudioSpec(freq=44100, format=sdl2.audio.AUDIO_S16, channels=2, samples=4096) audio_device = sdl2.audio.SDL_OpenAudioDevice(None, 0, spec, None, 0) Here, we designate the frequency of audio (44100Hz), format (16 -bit integer), number of channels (2), and samples (4096). Step 5: Define the audio processing function In PYSDL2, we can define a audio processing function to process audio data.The following is a simple example: python def audio_callback(userdata, stream, length): # Here pass In this function, we can process the audio data, such as modifying the audio effect or increasing the volume. Step 6: Set audio processing callback To set the audio processing recovery function, please use the following code: python sdl2.audio.SDL_SetAudioCallback(audio_device, sdl2.audio.SDL_AudioCallback(audio_callback)) This will make SDL2 call the audio processing recovery function when the audio data needs. Step 7: Play audio Use the following code to start playing audio: python sdl2.audio.SDL_PauseAudioDevice(audio_device, 0) Step 8: Clean up and close After completing the audio playback, we must clean up and close before the end: python sdl2.audio.SDL_CloseAudioDevice(audio_device) sdl2.ext.quit() These code will turn off the audio equipment and clean up the initialization of SDL2. The following is a complete example code: python import sdl2 import sdl2.ext def audio_callback(userdata, stream, length): # Here pass sdl2.ext.init() spec = sdl2.audio.SDL_AudioSpec(freq=44100, format=sdl2.audio.AUDIO_S16, channels=2, samples=4096) audio_device = sdl2.audio.SDL_OpenAudioDevice(None, 0, spec, None, 0) sdl2.audio.SDL_SetAudioCallback(audio_device, sdl2.audio.SDL_AudioCallback(audio_callback)) sdl2.audio.SDL_PauseAudioDevice(audio_device, 0) #The other operations here, such as waiting for the audio to play sdl2.audio.SDL_CloseAudioDevice(audio_device) sdl2.ext.quit() This is a simple example code that you can modify and expand according to your needs. I hope this guide can help you use PYSDL2 to achieve audio playback and processing.If you need to explain more details and code configuration, please refer to the official documentation and official examples of PYSDL2.