SDL/test/testaudioinfo.c

/*
  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely.
*/
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
#include <SDL3/SDL_test.h>

static void
print_devices(SDL_bool iscapture)
{
    SDL_AudioSpec spec;
    const char *typestr = ((iscapture) ? "capture" : "output");
    int n = 0;
    int frames;
    SDL_AudioDeviceID *devices = iscapture ? SDL_GetAudioCaptureDevices(&n) : SDL_GetAudioOutputDevices(&n);

    if (!devices) {
        SDL_Log("  Driver failed to report %s devices: %s\n\n", typestr, SDL_GetError());
    } else if (n == 0) {
        SDL_Log("  No %s devices found.\n\n", typestr);
    } else {
        int i;
        SDL_Log("Found %d %s device%s:\n", n, typestr, n != 1 ? "s" : "");
        for (i = 0; i < n; i++) {
            char *name = SDL_GetAudioDeviceName(devices[i]);
            if (name) {
                SDL_Log("  %d: %s\n", i, name);
                SDL_free(name);
            } else {
                SDL_Log("  %d Error: %s\n", i, SDL_GetError());
            }

            if (SDL_GetAudioDeviceFormat(devices[i], &spec, &frames) == 0) {
                SDL_Log("     Sample Rate: %d\n", spec.freq);
                SDL_Log("     Channels: %d\n", spec.channels);
                SDL_Log("     SDL_AudioFormat: %X\n", spec.format);
                SDL_Log("     Buffer Size: %d frames\n", frames);
            }
        }
        SDL_Log("\n");
    }
    SDL_free(devices);
}

int main(int argc, char **argv)
{
    SDL_AudioSpec spec;
    int i;
    int n;
    int frames;
    SDLTest_CommonState *state;

    /* Initialize test framework */
    state = SDLTest_CommonCreateState(argv, 0);
    if (!state) {
        return 1;
    }

    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    /* Parse commandline */
    if (!SDLTest_CommonDefaultArgs(state, argc, argv)) {
        return 1;
    }

    /* Load the SDL library */
    if (SDL_Init(SDL_INIT_AUDIO) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return 1;
    }

    /* Print available audio drivers */
    n = SDL_GetNumAudioDrivers();
    if (n == 0) {
        SDL_Log("No built-in audio drivers\n\n");
    } else {
        SDL_Log("Built-in audio drivers:\n");
        for (i = 0; i < n; ++i) {
            SDL_Log("  %d: %s\n", i, SDL_GetAudioDriver(i));
        }
        SDL_Log("Select a driver with the SDL_AUDIO_DRIVER environment variable.\n");
    }

    SDL_Log("Using audio driver: %s\n\n", SDL_GetCurrentAudioDriver());

    print_devices(SDL_FALSE);
    print_devices(SDL_TRUE);

    if (SDL_GetAudioDeviceFormat(SDL_AUDIO_DEVICE_DEFAULT_OUTPUT, &spec, &frames) < 0) {
        SDL_Log("Error when calling SDL_GetAudioDeviceFormat(default output): %s\n", SDL_GetError());
    } else {
        SDL_Log("Default Output Device:\n");
        SDL_Log("Sample Rate: %d\n", spec.freq);
        SDL_Log("Channels: %d\n", spec.channels);
        SDL_Log("SDL_AudioFormat: %X\n", spec.format);
        SDL_Log("Buffer Size: %d frames\n", frames);
    }

    if (SDL_GetAudioDeviceFormat(SDL_AUDIO_DEVICE_DEFAULT_CAPTURE, &spec, &frames) < 0) {
        SDL_Log("Error when calling SDL_GetAudioDeviceFormat(default capture): %s\n", SDL_GetError());
    } else {
        SDL_Log("Default Capture Device:\n");
        SDL_Log("Sample Rate: %d\n", spec.freq);
        SDL_Log("Channels: %d\n", spec.channels);
        SDL_Log("SDL_AudioFormat: %X\n", spec.format);
        SDL_Log("Buffer Size: %d frames\n", frames);
    }

    SDL_Quit();
    SDLTest_CommonDestroyState(state);
    return 0;
}