testmultiaudio.c
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/*
Copyright (C) 1997-2014 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 <stdio.h> /* for fflush() and stdout */
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#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
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static SDL_AudioSpec spec;
static Uint8 *sound = NULL; /* Pointer to wave data */
static Uint32 soundlen = 0; /* Length of wave data */
typedef struct
{
SDL_AudioDeviceID dev;
int soundpos;
volatile int done;
} callback_data;
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callback_data cbd[64];
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void SDLCALL
play_through_once(void *arg, Uint8 * stream, int len)
{
callback_data *cbd = (callback_data *) arg;
Uint8 *waveptr = sound + cbd->soundpos;
int waveleft = soundlen - cbd->soundpos;
int cpy = len;
if (cpy > waveleft)
cpy = waveleft;
SDL_memcpy(stream, waveptr, cpy);
len -= cpy;
cbd->soundpos += cpy;
if (len > 0) {
stream += cpy;
SDL_memset(stream, spec.silence, len);
cbd->done++;
}
}
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void
loop()
{
if(cbd[0].done) {
emscripten_cancel_main_loop();
SDL_PauseAudioDevice(cbd[0].dev, 1);
SDL_CloseAudioDevice(cbd[0].dev);
SDL_FreeWAV(sound);
SDL_Quit();
}
}
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static void
test_multi_audio(int devcount)
{
int keep_going = 1;
int i;
#ifdef __ANDROID__
SDL_Event event;
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/* Create a Window to get fully initialized event processing for testing pause on Android. */
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SDL_CreateWindow("testmultiaudio", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, 0);
#endif
if (devcount > 64) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Too many devices (%d), clamping to 64...\n",
devcount);
devcount = 64;
}
spec.callback = play_through_once;
for (i = 0; i < devcount; i++) {
const char *devname = SDL_GetAudioDeviceName(i, 0);
SDL_Log("playing on device #%d: ('%s')...", i, devname);
fflush(stdout);
SDL_memset(&cbd[0], '\0', sizeof(callback_data));
spec.userdata = &cbd[0];
cbd[0].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
if (cbd[0].dev == 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device failed: %s\n", SDL_GetError());
} else {
SDL_PauseAudioDevice(cbd[0].dev, 0);
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#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
while (!cbd[0].done)
{
#ifdef __ANDROID__
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/* Empty queue, some application events would prevent pause. */
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while (SDL_PollEvent(&event)){}
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#endif
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SDL_Delay(100);
}
SDL_PauseAudioDevice(cbd[0].dev, 1);
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#endif
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SDL_Log("done.\n");
SDL_CloseAudioDevice(cbd[0].dev);
}
}
SDL_memset(cbd, '\0', sizeof(cbd));
SDL_Log("playing on all devices...\n");
for (i = 0; i < devcount; i++) {
const char *devname = SDL_GetAudioDeviceName(i, 0);
spec.userdata = &cbd[i];
cbd[i].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
if (cbd[i].dev == 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device %d failed: %s\n", i, SDL_GetError());
}
}
for (i = 0; i < devcount; i++) {
if (cbd[i].dev) {
SDL_PauseAudioDevice(cbd[i].dev, 0);
}
}
while (keep_going) {
keep_going = 0;
for (i = 0; i < devcount; i++) {
if ((cbd[i].dev) && (!cbd[i].done)) {
keep_going = 1;
}
}
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#ifdef __ANDROID__
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/* Empty queue, some application events would prevent pause. */
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while (SDL_PollEvent(&event)){}
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#endif
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SDL_Delay(100);
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}
}
int
main(int argc, char **argv)
{
int devcount = 0;
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
/* 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);
}
SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
devcount = SDL_GetNumAudioDevices(0);
if (devcount < 1) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Don't see any specific audio devices!\n");
} else {
if (argv[1] == NULL) {
argv[1] = "sample.wav";
}
/* Load the wave file into memory */
if (SDL_LoadWAV(argv[1], &spec, &sound, &soundlen) == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", argv[1],
SDL_GetError());
} else {
test_multi_audio(devcount);
SDL_FreeWAV(sound);
}
}
SDL_Quit();
return 0;
}