test/testmultiaudio.c
author Philipp Wiesemann <philipp.wiesemann@arcor.de>
Wed, 10 Dec 2014 21:10:55 +0100
changeset 9269 d51f84c20b10
parent 9145 aa99e029b12e
child 9278 8900afb78a19
permissions -rw-r--r--
Added comments in example program.
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/*
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  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely.
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*/
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#include "SDL.h"
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#include <stdio.h> /* for fflush() and stdout */
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static SDL_AudioSpec spec;
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static Uint8 *sound = NULL;     /* Pointer to wave data */
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static Uint32 soundlen = 0;     /* Length of wave data */
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typedef struct
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{
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    SDL_AudioDeviceID dev;
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    int soundpos;
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    volatile int done;
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} callback_data;
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void SDLCALL
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play_through_once(void *arg, Uint8 * stream, int len)
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{
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    callback_data *cbd = (callback_data *) arg;
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    Uint8 *waveptr = sound + cbd->soundpos;
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    int waveleft = soundlen - cbd->soundpos;
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    int cpy = len;
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    if (cpy > waveleft)
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        cpy = waveleft;
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    SDL_memcpy(stream, waveptr, cpy);
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    len -= cpy;
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    cbd->soundpos += cpy;
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    if (len > 0) {
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        stream += cpy;
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        SDL_memset(stream, spec.silence, len);
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        cbd->done++;
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    }
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}
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static void
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test_multi_audio(int devcount)
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{
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    callback_data cbd[64];
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    int keep_going = 1;
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    int i;
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#ifdef __ANDROID__  
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    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);
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#endif
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    if (devcount > 64) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Too many devices (%d), clamping to 64...\n",
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                devcount);
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        devcount = 64;
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    }
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    spec.callback = play_through_once;
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    for (i = 0; i < devcount; i++) {
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        const char *devname = SDL_GetAudioDeviceName(i, 0);
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        SDL_Log("playing on device #%d: ('%s')...", i, devname);
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        fflush(stdout);
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        SDL_memset(&cbd[0], '\0', sizeof(callback_data));
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        spec.userdata = &cbd[0];
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        cbd[0].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
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        if (cbd[0].dev == 0) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device failed: %s\n", SDL_GetError());
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        } else {
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            SDL_PauseAudioDevice(cbd[0].dev, 0);
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            while (!cbd[0].done) {
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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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            }
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            SDL_PauseAudioDevice(cbd[0].dev, 1);
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            SDL_Log("done.\n");
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            SDL_CloseAudioDevice(cbd[0].dev);
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        }
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    }
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    SDL_memset(cbd, '\0', sizeof(cbd));
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    SDL_Log("playing on all devices...\n");
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    for (i = 0; i < devcount; i++) {
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        const char *devname = SDL_GetAudioDeviceName(i, 0);
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        spec.userdata = &cbd[i];
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        cbd[i].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
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        if (cbd[i].dev == 0) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device %d failed: %s\n", i, SDL_GetError());
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        }
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    }
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    for (i = 0; i < devcount; i++) {
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        if (cbd[i].dev) {
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            SDL_PauseAudioDevice(cbd[i].dev, 0);
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        }
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    }
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    while (keep_going) {
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        keep_going = 0;
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        for (i = 0; i < devcount; i++) {
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            if ((cbd[i].dev) && (!cbd[i].done)) {
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                keep_going = 1;
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            }
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        }
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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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    }
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    for (i = 0; i < devcount; i++) {
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        if (cbd[i].dev) {
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            SDL_PauseAudioDevice(cbd[i].dev, 1);
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            SDL_CloseAudioDevice(cbd[i].dev);
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        }
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    }
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    SDL_Log("All done!\n");
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}
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int
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main(int argc, char **argv)
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{
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    int devcount = 0;
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	/* Enable standard application logging */
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    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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    /* Load the SDL library */
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    if (SDL_Init(SDL_INIT_AUDIO) < 0) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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        return (1);
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    }
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    SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
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    devcount = SDL_GetNumAudioDevices(0);
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    if (devcount < 1) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Don't see any specific audio devices!\n");
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    } else {
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        if (argv[1] == NULL) {
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            argv[1] = "sample.wav";
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        }
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        /* Load the wave file into memory */
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        if (SDL_LoadWAV(argv[1], &spec, &sound, &soundlen) == NULL) {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", argv[1],
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                    SDL_GetError());
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        } else {
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            test_multi_audio(devcount);
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            SDL_FreeWAV(sound);
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        }
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    }
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    SDL_Quit();
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    return 0;
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}