miniaudio/tests/emscripten/emscripten.c

#define MA_DEBUG_OUTPUT
#define MA_NO_DECODING
#define MA_NO_ENCODING
#include "../../miniaudio.c"
#include "../../extras/backends/sdl2/miniaudio_sdl2.c"

#include <stdio.h>

/*#define DEVICE_BACKEND      ma_device_backend_sdl2*/
#define DEVICE_BACKEND      ma_device_backend_webaudio
#define DEVICE_FORMAT       ma_format_f32
#define DEVICE_CHANNELS     2
#define DEVICE_SAMPLE_RATE  48000

ma_threading_mode threadingMode = MA_THREADING_MODE_MULTI_THREADED;
/*ma_threading_mode threadingMode = MA_THREADING_MODE_SINGLE_THREADED;*/

ma_bool32 isRunning = MA_FALSE;
ma_device device;
ma_waveform sineWave;   /* For playback example. */


void main_loop__em(void* pUserData)
{
    if (threadingMode == MA_THREADING_MODE_SINGLE_THREADED) {
        ma_device_step((ma_device*)pUserData, MA_BLOCKING_MODE_NON_BLOCKING);
    }
}



void data_callback_playback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
    MA_ASSERT(pDevice->playback.channels == DEVICE_CHANNELS);

    ma_waveform_read_pcm_frames(&sineWave, pOutput, frameCount, NULL);

    (void)pInput;   /* Unused. */
}

static void do_playback()
{
    ma_result result;
    ma_device_config deviceConfig;
    ma_waveform_config sineWaveConfig;
    ma_device_backend_config backend;

    backend = ma_device_backend_config_init(DEVICE_BACKEND, NULL);

    deviceConfig = ma_device_config_init(ma_device_type_playback);
    deviceConfig.threadingMode      = threadingMode;
    deviceConfig.playback.format    = DEVICE_FORMAT;
    deviceConfig.playback.channels  = DEVICE_CHANNELS;
    deviceConfig.sampleRate         = DEVICE_SAMPLE_RATE;
    deviceConfig.dataCallback       = data_callback_playback;
    deviceConfig.pUserData          = &sineWave;
    deviceConfig.pBackendConfigs    = &backend;
    deviceConfig.backendConfigCount = 1;
    result = ma_device_init_ex(&backend, 1, NULL, &deviceConfig, &device);
    if (result != MA_SUCCESS) {
        printf("Failed to open playback device. %s.\n", ma_result_description(result));
        return;
    }

    sineWaveConfig = ma_waveform_config_init(device.playback.format, device.playback.channels, device.sampleRate, ma_waveform_type_sine, 0.2, 220);
    ma_waveform_init(&sineWaveConfig, &sineWave);

    result = ma_device_start(&device);
    if (result != MA_SUCCESS) {
        printf("Failed to start device. %s.\n", ma_result_description(result));
        return;
    }
}



void data_callback_duplex(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
    MA_ASSERT(pDevice->capture.format == pDevice->playback.format);
    MA_ASSERT(pDevice->capture.channels == pDevice->playback.channels);

    /* In this example the format and channel count are the same for both input and output which means we can just memcpy(). */
    MA_COPY_MEMORY(pOutput, pInput, frameCount * ma_get_bytes_per_frame(pDevice->capture.format, pDevice->capture.channels));
}

static void do_duplex()
{
    ma_result result;
    ma_device_config deviceConfig;
    ma_device_backend_config backend;

    backend = ma_device_backend_config_init(DEVICE_BACKEND, NULL);

    deviceConfig = ma_device_config_init(ma_device_type_duplex);
    deviceConfig.threadingMode      = threadingMode;
    deviceConfig.capture.pDeviceID  = NULL;
    deviceConfig.capture.format     = DEVICE_FORMAT;
    deviceConfig.capture.channels   = 2;
    deviceConfig.playback.pDeviceID = NULL;
    deviceConfig.playback.format    = DEVICE_FORMAT;
    deviceConfig.playback.channels  = 2;
    deviceConfig.sampleRate         = DEVICE_SAMPLE_RATE;
    deviceConfig.dataCallback       = data_callback_duplex;
    deviceConfig.pBackendConfigs    = &backend;
    deviceConfig.backendConfigCount = 1;
    result = ma_device_init_ex(&backend, 1, NULL, &deviceConfig, &device);
    if (result != MA_SUCCESS) {
        return;
    }

    if (ma_device_start(&device) != MA_SUCCESS) {
        printf("Failed to start device.");
        return;
    }
}


ma_device loopbackPlaybackDevice;
ma_pcm_rb loopbackRB;

void data_callback_loopback_capture(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
    ma_uint32 framesToWrite;
    void* pBuffer;

    (void)pDevice;
    (void)pOutput;

    /* Write to the ring buffer. */
    framesToWrite = frameCount;
    ma_pcm_rb_acquire_write(&loopbackRB, &framesToWrite, &pBuffer);
    MA_COPY_MEMORY(pBuffer, pInput, framesToWrite);
    ma_pcm_rb_commit_write(&loopbackRB, framesToWrite);
}

void data_callback_loopback_playback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
    ma_uint32 framesToRead;
    void* pBuffer;

    (void)pDevice;
    (void)pInput;

    /* Read from the ring buffer. */
    framesToRead = frameCount;
    ma_pcm_rb_acquire_read(&loopbackRB, &framesToRead, &pBuffer);
    MA_COPY_MEMORY(pOutput, pBuffer, framesToRead);
    ma_pcm_rb_commit_read(&loopbackRB, framesToRead);
}

static void do_loopback()
{
    ma_result result;
    ma_device_config deviceConfig;
    ma_device_backend_config backend;

    backend = ma_device_backend_config_init(DEVICE_BACKEND, NULL);

    deviceConfig = ma_device_config_init(ma_device_type_loopback);
    deviceConfig.threadingMode      = threadingMode;
    deviceConfig.capture.format     = DEVICE_FORMAT;
    deviceConfig.capture.channels   = 2;
    deviceConfig.sampleRate         = DEVICE_SAMPLE_RATE;
    deviceConfig.dataCallback       = data_callback_loopback_capture;
    deviceConfig.pBackendConfigs    = &backend;
    deviceConfig.backendConfigCount = 1;
    result = ma_device_init_ex(&backend, 1, NULL, &deviceConfig, &device);
    if (result != MA_SUCCESS) {
        printf("Failed to initialize loopback device.\n");
        return;
    }

    deviceConfig = ma_device_config_init(ma_device_type_playback);
    deviceConfig.threadingMode      = threadingMode;
    deviceConfig.playback.format    = DEVICE_FORMAT;
    deviceConfig.playback.channels  = 2;
    deviceConfig.sampleRate         = DEVICE_SAMPLE_RATE;
    deviceConfig.dataCallback       = data_callback_loopback_playback;
    deviceConfig.pBackendConfigs    = &backend;
    deviceConfig.backendConfigCount = 1;
    result = ma_device_init_ex(&backend, 1, NULL, &deviceConfig, &loopbackPlaybackDevice);
    if (result != MA_SUCCESS) {
        printf("Failed to initialize loopback playback device.\n");
        return;
    }


    /* We need a ring buffer. */
    printf("device.capture.internalPeriodSizeInFrames = %u\n", device.capture.internalPeriodSizeInFrames);
    ma_pcm_rb_init(DEVICE_FORMAT, device.capture.channels, device.capture.internalPeriodSizeInFrames * 100, NULL, NULL, &loopbackRB);


    if (ma_device_start(&loopbackPlaybackDevice) != MA_SUCCESS) {
        printf("Failed to start loopback playback device.");
        return;
    }

    if (ma_device_start(&device) != MA_SUCCESS) {
        printf("Failed to start device.");
        return;
    }
}


static EM_BOOL on_canvas_click(int eventType, const EmscriptenMouseEvent* pMouseEvent, void* pUserData)
{
    if (isRunning == MA_FALSE) {
        /*  */ if (pMouseEvent->button == 0) {  /* Left click. */
            do_playback();
        } else if (pMouseEvent->button == 2) {  /* Right click. */
            do_duplex();
        } else if (pMouseEvent->button == 1) {  /* Middle click. */
            do_loopback();
        }

        isRunning = MA_TRUE;
    } else {
        if (ma_device_get_status(&device) == ma_device_status_started) {
            ma_device_stop(&device);
        } else {
            ma_device_start(&device);
        }
    }

    (void)eventType;
    (void)pUserData;

    return EM_FALSE;
}


static void print_device_info(const ma_device_info* pDeviceInfo)
{
    ma_uint32 iFormat;

    printf("%s\n", pDeviceInfo->name);
    printf("    Default:      %s\n", (pDeviceInfo->isDefault) ? "Yes" : "No");
    printf("    Format Count: %d\n", pDeviceInfo->nativeDataFormatCount);
    for (iFormat = 0; iFormat < pDeviceInfo->nativeDataFormatCount; ++iFormat) {
        printf("        %s, [%d, %d], [%d, %d]\n",
            ma_get_format_name(pDeviceInfo->nativeDataFormats[iFormat].format),
            pDeviceInfo->nativeDataFormats[iFormat].minChannels,   pDeviceInfo->nativeDataFormats[iFormat].maxChannels,
            pDeviceInfo->nativeDataFormats[iFormat].minSampleRate, pDeviceInfo->nativeDataFormats[iFormat].maxSampleRate);
    }
}

static void enumerate_devices()
{
    ma_result result;
    ma_context context;
    ma_device_backend_config backend;
    ma_device_info* pPlaybackDevices;
    ma_device_info* pCaptureDevices;
    ma_uint32 playbackDeviceCount;
    ma_uint32 captureDeviceCount;
    ma_uint32 iDevice;

    backend = ma_device_backend_config_init(DEVICE_BACKEND, NULL);

    result = ma_context_init(&backend, 1, NULL, &context);
    if (result != MA_SUCCESS) {
        printf("Failed to create context for device enumeration.\n");
        return;
    }

    result = ma_context_get_devices(&context, &pPlaybackDevices, &playbackDeviceCount, &pCaptureDevices, &captureDeviceCount);
    if (result != MA_SUCCESS) {
        printf("Failed to enumerate devices.\n");
        ma_context_uninit(&context);
        return;
    }

    printf("Playback Devices\n");
    printf("----------------\n");
    for (iDevice = 0; iDevice < playbackDeviceCount; iDevice += 1) {
        printf("%d: ", iDevice);
        print_device_info(&pPlaybackDevices[iDevice]);
    }
    printf("\n");

    printf("Capture Devices\n");
    printf("---------------\n");
    for (iDevice = 0; iDevice < captureDeviceCount; iDevice += 1) {
        printf("%d: ", iDevice);
        print_device_info(&pCaptureDevices[iDevice]);
    }
    printf("\n");
}


int main(int argc, char** argv)
{
    enumerate_devices();

    printf("Click inside canvas to start playing:\n");
    printf("    Left click for playback\n");
    printf("    Right click for duplex\n");
    printf("    Middle click for loopback\n");

    /* The device must be started in response to an input event. */
    emscripten_set_mouseup_callback("canvas", &device, 0, on_canvas_click);
    
    emscripten_set_main_loop_arg(main_loop__em, &device, 0, 1);
    
    (void)argc;
    (void)argv;
    return 0;
}