Initial Commit

thirdparty/miniaudio-0.11.24/examples/simple_playback_sine.c

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+/*
+Demonstrates playback of a sine wave.
+
+Since all this example is doing is playing back a sine wave, we can disable decoding (and encoding) which will slightly
+reduce the size of the executable. This is done with the `MA_NO_DECODING` and `MA_NO_ENCODING` options.
+
+The generation of sine wave is achieved via the `ma_waveform` API. A waveform is a data source which means it can be
+seamlessly plugged into the `ma_data_source_*()` family of APIs as well.
+
+A waveform is initialized using the standard config/init pattern used throughout all of miniaudio. Frames are read via
+the `ma_waveform_read_pcm_frames()` API.
+
+This example works with Emscripten.
+*/
+#define MA_NO_DECODING
+#define MA_NO_ENCODING
+#include "../miniaudio.c"
+
+#include <stdio.h>
+
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+
+void main_loop__em()
+{
+}
+#endif
+
+#define DEVICE_FORMAT       ma_format_f32
+#define DEVICE_CHANNELS     2
+#define DEVICE_SAMPLE_RATE  48000
+
+void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
+{
+    ma_waveform_read_pcm_frames((ma_waveform*)pDevice->pUserData, pOutput, frameCount, NULL);
+
+    (void)pInput;   /* Unused. */
+}
+
+int main(int argc, char** argv)
+{
+    ma_waveform sineWave;
+    ma_device_config deviceConfig;
+    ma_device device;
+    ma_waveform_config sineWaveConfig;
+
+    deviceConfig = ma_device_config_init(ma_device_type_playback);
+    deviceConfig.playback.format   = DEVICE_FORMAT;
+    deviceConfig.playback.channels = DEVICE_CHANNELS;
+    deviceConfig.sampleRate        = DEVICE_SAMPLE_RATE;
+    deviceConfig.dataCallback      = data_callback;
+    deviceConfig.pUserData         = &sineWave;
+
+    if (ma_device_init(NULL, &deviceConfig, &device) != MA_SUCCESS) {
+        printf("Failed to open playback device.\n");
+        return -4;
+    }
+
+    printf("Device Name: %s\n", device.playback.name);
+
+    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);
+
+    if (ma_device_start(&device) != MA_SUCCESS) {
+        printf("Failed to start playback device.\n");
+        ma_device_uninit(&device);
+        return -5;
+    }
+    
+#ifdef __EMSCRIPTEN__
+    emscripten_set_main_loop(main_loop__em, 0, 1);
+#else
+    printf("Press Enter to quit...\n");
+    getchar();
+#endif
+    
+    ma_device_uninit(&device);
+    ma_waveform_uninit(&sineWave);  /* Uninitialize the waveform after the device so we don't pull it from under the device while it's being reference in the data callback. */
+    
+    (void)argc;
+    (void)argv;
+    return 0;
+}