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- /*
- 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 "SDL.h"
-
- #include <stdlib.h>
-
- #ifdef __EMSCRIPTEN__
- #include <emscripten/emscripten.h>
- #endif
-
- static SDL_Window *window = NULL;
- static SDL_Renderer *renderer = NULL;
- static SDL_AudioSpec spec;
- static SDL_AudioDeviceID devid_in = 0;
- static SDL_AudioDeviceID devid_out = 0;
-
- static void
- loop()
- {
- SDL_bool please_quit = SDL_FALSE;
- SDL_Event e;
-
- while (SDL_PollEvent(&e)) {
- if (e.type == SDL_QUIT) {
- please_quit = SDL_TRUE;
- } else if (e.type == SDL_KEYDOWN) {
- if (e.key.keysym.sym == SDLK_ESCAPE) {
- please_quit = SDL_TRUE;
- }
- } else if (e.type == SDL_MOUSEBUTTONDOWN) {
- if (e.button.button == 1) {
- SDL_PauseAudioDevice(devid_out, SDL_TRUE);
- SDL_PauseAudioDevice(devid_in, SDL_FALSE);
- }
- } else if (e.type == SDL_MOUSEBUTTONUP) {
- if (e.button.button == 1) {
- SDL_PauseAudioDevice(devid_in, SDL_TRUE);
- SDL_PauseAudioDevice(devid_out, SDL_FALSE);
- }
- }
- }
-
- if (SDL_GetAudioDeviceStatus(devid_in) == SDL_AUDIO_PLAYING) {
- SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
- } else {
- SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
- }
- SDL_RenderClear(renderer);
- SDL_RenderPresent(renderer);
-
- if (please_quit) {
- /* stop playing back, quit. */
- SDL_Log("Shutting down.\n");
- SDL_PauseAudioDevice(devid_in, 1);
- SDL_CloseAudioDevice(devid_in);
- SDL_PauseAudioDevice(devid_out, 1);
- SDL_CloseAudioDevice(devid_out);
- SDL_DestroyRenderer(renderer);
- SDL_DestroyWindow(window);
- SDL_Quit();
- #ifdef __EMSCRIPTEN__
- emscripten_cancel_main_loop();
- #endif
- exit(0);
- }
-
- /* Note that it would be easier to just have a one-line function that
- calls SDL_QueueAudio() as a capture device callback, but we're
- trying to test the API, so we use SDL_DequeueAudio() here. */
- while (SDL_TRUE) {
- Uint8 buf[1024];
- const Uint32 br = SDL_DequeueAudio(devid_in, buf, sizeof (buf));
- SDL_QueueAudio(devid_out, buf, br);
- if (br < sizeof (buf)) {
- break;
- }
- }
- }
-
- int
- main(int argc, char **argv)
- {
- /* (argv[1] == NULL means "open default device.") */
- const char *devname = argv[1];
- SDL_AudioSpec wanted;
- int devcount;
- int i;
-
- /* Enable standard application logging */
- SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
-
- /* Load the SDL library */
- if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
- return (1);
- }
-
- window = SDL_CreateWindow("testaudiocapture", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, 0);
- renderer = SDL_CreateRenderer(window, -1, 0);
- SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
- SDL_RenderClear(renderer);
- SDL_RenderPresent(renderer);
-
- SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
-
- devcount = SDL_GetNumAudioDevices(SDL_TRUE);
- for (i = 0; i < devcount; i++) {
- SDL_Log(" Capture device #%d: '%s'\n", i, SDL_GetAudioDeviceName(i, SDL_TRUE));
- }
-
- SDL_zero(wanted);
- wanted.freq = 44100;
- wanted.format = AUDIO_F32SYS;
- wanted.channels = 1;
- wanted.samples = 4096;
- wanted.callback = NULL;
-
- SDL_zero(spec);
-
- /* DirectSound can fail in some instances if you open the same hardware
- for both capture and output and didn't open the output end first,
- according to the docs, so if you're doing something like this, always
- open your capture devices second in case you land in those bizarre
- circumstances. */
-
- SDL_Log("Opening default playback device...\n");
- devid_out = SDL_OpenAudioDevice(NULL, SDL_FALSE, &wanted, &spec, SDL_AUDIO_ALLOW_ANY_CHANGE);
- if (!devid_out) {
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for playback: %s!\n", SDL_GetError());
- SDL_Quit();
- exit(1);
- }
-
- SDL_Log("Opening capture device %s%s%s...\n",
- devname ? "'" : "",
- devname ? devname : "[[default]]",
- devname ? "'" : "");
-
- devid_in = SDL_OpenAudioDevice(argv[1], SDL_TRUE, &spec, &spec, 0);
- if (!devid_in) {
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for capture: %s!\n", SDL_GetError());
- SDL_Quit();
- exit(1);
- }
-
- SDL_Log("Ready! Hold down mouse or finger to record!\n");
-
- #ifdef __EMSCRIPTEN__
- emscripten_set_main_loop(loop, 0, 1);
- #else
- while (1) { loop(); SDL_Delay(16); }
- #endif
-
- return 0;
- }
-
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