write pcm data to file

ai-conversation/audio_capture.c

@@ -130,18 +130,29 @@ int main() {
     *  Each period is 2048 BYTES because each frame is 2 bytes.
     *  Each frame is 2 bytes because of 1 channel, and 16 bit format
     */
+    FILE *file = fopen("output.pcm", "wb");
+    if (file == NULL) {
+      perror("Error opening file");
+      return 1;
+    }
     while (snd_pcm_readi(pcm_handle, (void *)buf, period_size) > 0 && periods_read < periods_to_read) {
         printf("======READING FRAMES========\n");
 
         // Because each frame is 2 bytes (format/bit rate), cast to int16
-        int16_t *samples = (int16_t *)buf;
-        for (int i = 0; i < period_size; i++) {
-            printf("%d ", samples[i]);
-        }
+        // int16_t *samples = (int16_t *)buf;
+        // for (int i = 0; i < period_size; i++) {
+        //     printf("%d ", samples[i]);
+        // }
+
+        fwrite(buf, sizeof(int16_t), period_size, file);
+
         printf("\n");
         periods_read++;
     }
 
+    // TODO: keep appending above frames into one buffer, and send to deepgram
+
+    fclose(file);
     free((void *)buf);
     snd_pcm_close(pcm_handle);
     snd_pcm_hw_params_free(params);