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84 lines
1.8 KiB
84 lines
1.8 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <tinyalsa/pcm.h>
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static size_t read_frames(void **frames)
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{
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unsigned int card = 0;
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unsigned int device = 0;
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int flags = PCM_IN;
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const struct pcm_config config = {
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.channels = 2,
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.rate = 48000,
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.format = PCM_FORMAT_S32_LE,
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.period_size = 1024,
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.period_count = 2,
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.start_threshold = 1024,
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.silence_threshold = 1024 * 2,
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.stop_threshold = 1024 * 2
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};
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struct pcm *pcm = pcm_open(card, device, flags, &config);
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if (pcm == NULL) {
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fprintf(stderr, "failed to allocate memory for PCM\n");
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return 0;
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} else if (!pcm_is_ready(pcm)){
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pcm_close(pcm);
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fprintf(stderr, "failed to open PCM\n");
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return 0;
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}
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unsigned int frame_size = pcm_frames_to_bytes(pcm, 1);
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unsigned int frames_per_sec = pcm_get_rate(pcm);
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*frames = malloc(frame_size * frames_per_sec);
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if (*frames == NULL) {
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fprintf(stderr, "failed to allocate frames\n");
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pcm_close(pcm);
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return 0;
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}
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int read_count = pcm_readi(pcm, *frames, frames_per_sec);
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size_t byte_count = pcm_frames_to_bytes(pcm, read_count);
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pcm_close(pcm);
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return byte_count;
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}
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static int write_file(const void *frames, size_t size)
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{
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FILE *output_file = fopen("audio.raw", "wb");
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if (output_file == NULL) {
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perror("failed to open 'audio.raw' for writing");
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return EXIT_FAILURE;
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}
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fwrite(frames, 1, size, output_file);
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fclose(output_file);
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return 0;
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}
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int main(void)
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{
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void *frames = NULL;
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size_t size = 0;
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size = read_frames(&frames);
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if (size == 0) {
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return EXIT_FAILURE;
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}
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if (write_file(frames, size) < 0) {
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free(frames);
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return EXIT_FAILURE;
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}
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free(frames);
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return EXIT_SUCCESS;
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}
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