mirror of https://github.com/mackron/miniaudio.git
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
|
|
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
|
|
#define MINIAUDIO_IMPLEMENTATION
|
|
#include "../miniaudio.h"
|
|
|
|
#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* pSineWave;
|
|
|
|
MA_ASSERT(pDevice->playback.channels == DEVICE_CHANNELS);
|
|
|
|
pSineWave = (ma_waveform*)pDevice->pUserData;
|
|
MA_ASSERT(pSineWave != NULL);
|
|
|
|
ma_waveform_read_pcm_frames(pSineWave, 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;
|
|
}
|