mirror of
https://github.com/mackron/miniaudio.git
synced 2026-04-22 00:06:59 +02:00
David Reid
766a155fb3
This is useful because MA_ASSERT is only defined in the implementation section of miniaudio.h which can cause issues when people copy/paste the code and use it in a file that does not have visibility of the implementation. Note that there are still more references to implementation-defined macros, but these have been moved to the public section in the dev-0.12 branch so I'm not bothering to change those just yet. Public issue https://github.com/mackron/miniaudio/issues/787
80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/*
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Demonstrates how to implement loopback recording.
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This example simply captures data from your default playback device until you press Enter. The output is saved to the
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file specified on the command line.
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Loopback mode is when you record audio that is played from a given speaker. It is only supported on WASAPI, but can be
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used indirectly with PulseAudio by choosing the appropriate loopback device after enumeration.
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To use loopback mode you just need to set the device type to ma_device_type_loopback and set the capture device config
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properties. The output buffer in the callback will be null whereas the input buffer will be valid.
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*/
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#define MINIAUDIO_IMPLEMENTATION
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#include "../miniaudio.h"
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#include <stdlib.h>
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#include <stdio.h>
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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_encoder_write_pcm_frames((ma_encoder*)pDevice->pUserData, pInput, frameCount, NULL);
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(void)pOutput;
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}
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int main(int argc, char** argv)
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{
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ma_result result;
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ma_encoder_config encoderConfig;
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ma_encoder encoder;
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ma_device_config deviceConfig;
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ma_device device;
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/* Loopback mode is currently only supported on WASAPI. */
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ma_backend backends[] = {
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ma_backend_wasapi
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};
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if (argc < 2) {
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printf("No output file.\n");
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return -1;
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}
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encoderConfig = ma_encoder_config_init(ma_encoding_format_wav, ma_format_f32, 2, 44100);
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if (ma_encoder_init_file(argv[1], &encoderConfig, &encoder) != MA_SUCCESS) {
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printf("Failed to initialize output file.\n");
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return -1;
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}
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deviceConfig = ma_device_config_init(ma_device_type_loopback);
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deviceConfig.capture.pDeviceID = NULL; /* Use default device for this example. Set this to the ID of a _playback_ device if you want to capture from a specific device. */
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deviceConfig.capture.format = encoder.config.format;
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deviceConfig.capture.channels = encoder.config.channels;
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deviceConfig.sampleRate = encoder.config.sampleRate;
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deviceConfig.dataCallback = data_callback;
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deviceConfig.pUserData = &encoder;
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result = ma_device_init_ex(backends, sizeof(backends)/sizeof(backends[0]), NULL, &deviceConfig, &device);
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if (result != MA_SUCCESS) {
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printf("Failed to initialize loopback device.\n");
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return -2;
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}
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result = ma_device_start(&device);
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if (result != MA_SUCCESS) {
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ma_device_uninit(&device);
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printf("Failed to start device.\n");
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return -3;
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}
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printf("Press Enter to stop recording...\n");
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getchar();
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ma_device_uninit(&device);
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ma_encoder_uninit(&encoder);
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return 0;
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}
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