92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
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/*
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Demonstrates playback of a sine wave.
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Since all this example is doing is playing back a sine wave, we can disable decoding (and encoding) which will slightly
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reduce the size of the executable. This is done with the `MA_NO_DECODING` and `MA_NO_ENCODING` options.
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The generation of sine wave is achieved via the `ma_waveform` API. A waveform is a data source which means it can be
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seamlessly plugged into the `ma_data_source_*()` family of APIs as well.
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A waveform is initialized using the standard config/init pattern used throughout all of miniaudio. Frames are read via
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the `ma_waveform_read_pcm_frames()` API.
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This example works with Emscripten.
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*/
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#define MA_NO_DECODING
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#define MA_NO_ENCODING
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#define MINIAUDIO_IMPLEMENTATION
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#include "../miniaudio.h"
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#include <stdio.h>
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#ifdef __EMSCRIPTEN__
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#include <emscripten.h>
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void main_loop__em()
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{
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}
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#endif
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#define DEVICE_FORMAT ma_format_f32
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#define DEVICE_CHANNELS 2
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#define DEVICE_SAMPLE_RATE 48000
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void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
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{
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ma_waveform* pSineWave;
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MA_ASSERT(pDevice->playback.channels == DEVICE_CHANNELS);
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pSineWave = (ma_waveform*)pDevice->pUserData;
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MA_ASSERT(pSineWave != NULL);
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ma_waveform_read_pcm_frames(pSineWave, pOutput, frameCount, NULL);
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(void)pInput; /* Unused. */
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}
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int main(int argc, char** argv)
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{
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ma_waveform sineWave;
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ma_device_config deviceConfig;
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ma_device device;
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ma_waveform_config sineWaveConfig;
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deviceConfig = ma_device_config_init(ma_device_type_playback);
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deviceConfig.playback.format = DEVICE_FORMAT;
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deviceConfig.playback.channels = DEVICE_CHANNELS;
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deviceConfig.sampleRate = DEVICE_SAMPLE_RATE;
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deviceConfig.dataCallback = data_callback;
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deviceConfig.pUserData = &sineWave;
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if (ma_device_init(NULL, &deviceConfig, &device) != MA_SUCCESS) {
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printf("Failed to open playback device.\n");
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return -4;
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}
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printf("Device Name: %s\n", device.playback.name);
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sineWaveConfig = ma_waveform_config_init(device.playback.format, device.playback.channels, device.sampleRate, ma_waveform_type_sine, 0.2, 220);
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ma_waveform_init(&sineWaveConfig, &sineWave);
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if (ma_device_start(&device) != MA_SUCCESS) {
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printf("Failed to start playback device.\n");
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ma_device_uninit(&device);
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return -5;
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}
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop(main_loop__em, 0, 1);
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#else
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printf("Press Enter to quit...\n");
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getchar();
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#endif
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ma_device_uninit(&device);
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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. */
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(void)argc;
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(void)argv;
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return 0;
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}
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