test/testmultiaudio.c
author Ryan C. Gordon <icculus@icculus.org>
Tue, 17 Oct 2006 09:15:21 +0000
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Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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#include "SDL.h"
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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 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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    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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        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 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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    if (devcount > 64) {
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        fprintf(stderr, "Too many devices (%d), clamping to 64...\n", 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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        printf("playing on device #%d: ('%s')...", i, devname);
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        fflush(stdout);
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        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);
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        if (cbd[0].dev == 0) {
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            printf("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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                SDL_Delay(100);
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            SDL_PauseAudioDevice(cbd[0].dev, 1);
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            printf("done.\n");
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            SDL_CloseAudioDevice(cbd[0].dev);
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        }
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    }
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    memset(cbd, '\0', sizeof (cbd));
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    printf("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);
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        if (cbd[i].dev == 0) {
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            printf("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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        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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    printf("All done!\n");
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}
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int main(int argc, char **argv)
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{
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    int devcount = 0;
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    /* Load the SDL library */
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    if (SDL_Init(SDL_INIT_AUDIO) < 0) {
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        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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        return (1);
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    }
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    printf("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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        fprintf(stderr, "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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            fprintf(stderr, "Couldn't load %s: %s\n", argv[1], 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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}