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Added an audio recording test program
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/* | ||
Copyright (C) 1997-2017 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. | ||
*/ | ||
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/* Program to record audio from the microphone and play it back immediately */ | ||
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#include "SDL_config.h" | ||
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#include <stdio.h> | ||
#include <stdlib.h> | ||
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#if HAVE_SIGNAL_H | ||
#include <signal.h> | ||
#endif | ||
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#ifdef __EMSCRIPTEN__ | ||
#include <emscripten/emscripten.h> | ||
#endif | ||
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#include "SDL.h" | ||
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static SDL_AudioDeviceID device; | ||
static SDL_AudioDeviceID capture; | ||
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static void SDLCALL | ||
fillerup(void *unused, Uint8 * stream, int len) | ||
{ | ||
SDL_QueueAudio(device, stream, len); | ||
} | ||
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ | ||
static void | ||
quit(int rc) | ||
{ | ||
SDL_Quit(); | ||
exit(rc); | ||
} | ||
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static void | ||
close_audio() | ||
{ | ||
if (capture != 0) { | ||
SDL_CloseAudioDevice(capture); | ||
capture = 0; | ||
} | ||
if (device != 0) { | ||
SDL_CloseAudioDevice(device); | ||
device = 0; | ||
} | ||
} | ||
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static void | ||
open_audio() | ||
{ | ||
SDL_AudioSpec spec; | ||
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SDL_zero(spec); | ||
spec.freq = 44100; | ||
spec.format = AUDIO_S16; | ||
spec.channels = 1; | ||
spec.samples = 1024; | ||
spec.callback = fillerup; | ||
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capture = SDL_OpenAudioDevice(NULL, SDL_TRUE, &spec, &spec, SDL_AUDIO_ALLOW_ANY_CHANGE); | ||
if (!capture) { | ||
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open microphone: %s\n", SDL_GetError()); | ||
quit(2); | ||
} | ||
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spec.callback = NULL; | ||
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device = SDL_OpenAudioDevice(NULL, SDL_FALSE, &spec, NULL, 0); | ||
if (!device) { | ||
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open audio: %s\n", SDL_GetError()); | ||
quit(2); | ||
} | ||
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/* Let the audio run */ | ||
SDL_PauseAudioDevice(capture, SDL_FALSE); | ||
SDL_PauseAudioDevice(device, SDL_FALSE); | ||
} | ||
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static void reopen_audio() | ||
{ | ||
close_audio(); | ||
open_audio(); | ||
} | ||
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static int done = 0; | ||
void | ||
poked(int sig) | ||
{ | ||
done = 1; | ||
} | ||
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#ifdef __EMSCRIPTEN__ | ||
void | ||
loop() | ||
{ | ||
if(done || (SDL_GetAudioDeviceStatus(capture) != SDL_AUDIO_PLAYING) || (SDL_GetAudioDeviceStatus(device) != SDL_AUDIO_PLAYING)) | ||
emscripten_cancel_main_loop(); | ||
} | ||
#endif | ||
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int | ||
main(int argc, char *argv[]) | ||
{ | ||
int i; | ||
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/* Enable standard application logging */ | ||
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO); | ||
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/* Load the SDL library */ | ||
if (SDL_Init(SDL_INIT_AUDIO|SDL_INIT_EVENTS) < 0) { | ||
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError()); | ||
return (1); | ||
} | ||
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/* Show the list of available drivers */ | ||
SDL_Log("Available audio drivers:"); | ||
for (i = 0; i < SDL_GetNumAudioDrivers(); ++i) { | ||
SDL_Log("%i: %s", i, SDL_GetAudioDriver(i)); | ||
} | ||
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SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver()); | ||
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open_audio(); | ||
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SDL_FlushEvents(SDL_AUDIODEVICEADDED, SDL_AUDIODEVICEREMOVED); | ||
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#ifdef __EMSCRIPTEN__ | ||
emscripten_set_main_loop(loop, 0, 1); | ||
#else | ||
while (!done) { | ||
SDL_Event event; | ||
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while (SDL_PollEvent(&event) > 0) { | ||
if (event.type == SDL_QUIT) { | ||
done = 1; | ||
} | ||
if (event.type == SDL_AUDIODEVICEADDED || | ||
(event.type == SDL_AUDIODEVICEREMOVED && event.adevice.iscapture && event.adevice.which == capture) || | ||
(event.type == SDL_AUDIODEVICEREMOVED && !event.adevice.iscapture && event.adevice.which == device)) { | ||
reopen_audio(); | ||
} | ||
} | ||
SDL_Delay(100); | ||
} | ||
#endif | ||
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/* Clean up on signal */ | ||
close_audio(); | ||
SDL_Quit(); | ||
return (0); | ||
} | ||
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/* vi: set ts=4 sw=4 expandtab: */ |