99 lines
2.4 KiB
Plaintext
99 lines
2.4 KiB
Plaintext
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#include <SDL2/SDL.h>
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#include <stdio.h>
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#include <stdlib.h>
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typedef struct {
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Uint8* data;
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int current_pos;
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int max_length;
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} BufferType;
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SDL_AudioDeviceID dev;
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void audio_callback(void* userdata, Uint8* stream, int len)
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{
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BufferType* buffer = (BufferType*)userdata;
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printf("callback: %u %u\n", *stream, len);
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int space_left = buffer->max_length - buffer->current_pos;
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if (space_left <= 0) {
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// Buffer is full; stop the device
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SDL_PauseAudioDevice(dev, 1);
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printf("Buffer full, stopping recording.\n");
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return;
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}
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if (len > space_left) {
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len = space_left;
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}
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memcpy(buffer->data + buffer->current_pos, stream, len);
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buffer->current_pos += len;
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}
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int main(int argc, char* argv[])
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{
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if (SDL_Init(SDL_INIT_AUDIO) < 0) {
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fprintf(stderr, "Failed to initialize SDL: %s\n", SDL_GetError());
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return 1;
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}
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BufferType audio_buffer;
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audio_buffer.max_length = 44100 * 5 * sizeof(float) * 2; // 5 seconds of stereo float audio
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audio_buffer.data = (Uint8*)malloc(audio_buffer.max_length);
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if (audio_buffer.data == NULL) {
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fprintf(stderr, "Failed to allocate audio buffer\n");
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SDL_Quit();
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return 1;
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}
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audio_buffer.current_pos = 0;
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SDL_AudioSpec desired_spec, obtained_spec;
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SDL_zero(desired_spec);
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desired_spec.freq = 44100;
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desired_spec.format = AUDIO_F32SYS;
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desired_spec.channels = 2;
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desired_spec.samples = 512;
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desired_spec.callback = audio_callback;
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desired_spec.userdata = &audio_buffer;
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dev = SDL_OpenAudioDevice(NULL, 1, &desired_spec, &obtained_spec, 0);
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if (dev == 0) {
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fprintf(stderr, "Failed to open audio device: %s\n", SDL_GetError());
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free(audio_buffer.data);
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SDL_Quit();
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return 1;
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}
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printf("Audio device opened successfully.\n");
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printf("Obtained Spec:\n");
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printf(" Frequency: %d\n", obtained_spec.freq);
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printf(" Format: 0x%X\n", obtained_spec.format);
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printf(" Channels: %d\n", obtained_spec.channels);
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printf(" Samples: %d\n", obtained_spec.samples);
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SDL_PauseAudioDevice(dev, 0); // Start recording
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printf("Recording started.\n");
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SDL_Event event;
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while (audio_buffer.current_pos < audio_buffer.max_length) {
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while (SDL_PollEvent(&event)) {
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if (event.type == SDL_QUIT) {
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printf("Quit event received.\n");
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goto cleanup;
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}
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}
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SDL_Delay(100);
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}
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printf("Recording complete. Total bytes recorded: %d\n", audio_buffer.current_pos);
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cleanup:
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SDL_PauseAudioDevice(dev, 1); // Stop recording
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SDL_CloseAudioDevice(dev);
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free(audio_buffer.data);
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SDL_Quit();
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return 0;
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}
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