recieves serial audio from esp32 and pipes them into pulseaudio for other apps to enjoy
commit
a58f026d35
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import serial
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import pyaudio
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import numpy as np
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SERIAL_PORT = '/dev/ttyACM0' # Change this to your serial port
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BAUD_RATE = 1500000
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CHUNK_SIZE = 256 # Number of frames in each block
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p = pyaudio.PyAudio()
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stream = p.open(format=pyaudio.paInt16,
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channels=2,
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rate=16000,
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output=True)
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ser = serial.Serial(SERIAL_PORT, BAUD_RATE)
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print("Streaming audio...")
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try:
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while True:
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data = ser.read(CHUNK_SIZE * 4) # 2 channels × 2 bytes
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if not data:
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break
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audio_data = np.frombuffer(data, dtype=np.int16)
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stream.write(audio_data.tobytes())
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except KeyboardInterrupt:
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print("Stopping audio stream...")
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finally:
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stream.stop_stream()
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stream.close()
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p.terminate()
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ser.close()
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import serial
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import numpy as np
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import wave
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import time
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SERIAL_PORT = '/dev/ttyACM0' # Adjust if needed
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BAUD_RATE = 1500000
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CHUNK_SIZE = 256 # frames per block
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RATE = 16000 # sample rate
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CHANNELS = 2 # stereo
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# open serial
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ser = serial.Serial(SERIAL_PORT, BAUD_RATE)
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print("Recording 3 seconds of audio...")
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frames = []
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start = time.time()
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try:
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while time.time() - start < 3.0:
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# 2 channels × 2 bytes per sample = 4 bytes per frame
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data = ser.read(CHUNK_SIZE * 4)
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if not data:
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break
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frames.append(data)
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finally:
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ser.close()
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# write to wav
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with wave.open("capture.wav", "wb") as wf:
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wf.setnchannels(CHANNELS)
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wf.setsampwidth(2) # 16‑bit samples = 2 bytes
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wf.setframerate(RATE)
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wf.writeframes(b"".join(frames))
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print("Saved capture.wav")
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <time.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#define SERIAL_PORT "/dev/ttyACM1"
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#define BAUD_RATE B1500000
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#define RATE 16000
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#define CHANNELS 2
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#define SAMPLE_WIDTH 2 // 16-bit
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#define CHUNK_SIZE 256 // frames per block
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#define DURATION 3 // seconds
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// Write a simple WAV header
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void write_wav_header(FILE *f, int data_size) {
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int byte_rate = RATE * CHANNELS * SAMPLE_WIDTH;
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int block_align = CHANNELS * SAMPLE_WIDTH;
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// RIFF header
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fwrite("RIFF", 1, 4, f);
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int chunk_size = 36 + data_size;
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fwrite(&chunk_size, 4, 1, f);
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fwrite("WAVE", 1, 4, f);
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// fmt subchunk
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fwrite("fmt ", 1, 4, f);
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int subchunk1_size = 16;
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fwrite(&subchunk1_size, 4, 1, f);
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short audio_format = 1; // PCM
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fwrite(&audio_format, 2, 1, f);
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short num_channels = CHANNELS;
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fwrite(&num_channels, 2, 1, f);
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int sample_rate = RATE;
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fwrite(&sample_rate, 4, 1, f);
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fwrite(&byte_rate, 4, 1, f);
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fwrite(&block_align, 2, 1, f);
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short bits_per_sample = SAMPLE_WIDTH * 8;
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fwrite(&bits_per_sample, 2, 1, f);
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// data subchunk
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fwrite("data", 1, 4, f);
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fwrite(&data_size, 4, 1, f);
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}
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int main() {
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// Open serial port
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int fd = open(SERIAL_PORT, O_RDONLY | O_NOCTTY);
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if (fd < 0) {
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perror("open");
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return 1;
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}
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// Configure serial
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struct termios tty;
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memset(&tty, 0, sizeof tty);
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if (tcgetattr(fd, &tty) != 0) {
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perror("tcgetattr");
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return 1;
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}
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cfsetospeed(&tty, BAUD_RATE);
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cfsetispeed(&tty, BAUD_RATE);
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tty.c_cflag |= (CLOCAL | CREAD);
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tty.c_cflag &= ~CSIZE;
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tty.c_cflag |= CS8;
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tty.c_cflag &= ~PARENB;
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tty.c_cflag &= ~CSTOPB;
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tcsetattr(fd, TCSANOW, &tty);
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FILE *out = fopen("capture.wav", "wb");
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if (!out) {
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perror("fopen");
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return 1;
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}
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// Reserve space for header
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fseek(out, 44, SEEK_SET);
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int total_bytes = 0;
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char buf[CHUNK_SIZE * CHANNELS * SAMPLE_WIDTH];
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time_t start = time(NULL);
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while (time(NULL) - start < DURATION) {
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int n = read(fd, buf, sizeof(buf));
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if (n > 0) {
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fwrite(buf, 1, n, out);
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total_bytes += n;
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}
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}
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// Write header at beginning
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fseek(out, 0, SEEK_SET);
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write_wav_header(out, total_bytes);
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fclose(out);
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close(fd);
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printf("Saved capture.wav (%d bytes of audio)\n", total_bytes);
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return 0;
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}
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <termios.h>
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#define DEFAULT_PORT "/dev/ttyESP32_A"
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#define DEFAULT_BAUD B1500000
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int open_serial(const char *path, speed_t baud) {
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int fd = open(path, O_RDONLY | O_NOCTTY);
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if (fd < 0) { perror("open"); return -1; }
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struct termios tio;
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if (tcgetattr(fd, &tio) != 0) { perror("tcgetattr"); close(fd); return -1; }
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cfsetispeed(&tio, baud);
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cfsetospeed(&tio, baud);
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// Raw mode
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tio.c_iflag &= ~(IGNBRK | BRKINT | ICRNL | INLCR | IXON | IXOFF | IXANY |
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PARMRK | INPCK | ISTRIP);
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tio.c_oflag &= ~(OPOST);
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tio.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN | ISIG);
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tio.c_cflag &= ~(CSIZE | PARENB | CSTOPB | CRTSCTS);
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tio.c_cflag |= (CS8 | CLOCAL | CREAD);
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tio.c_cc[VMIN] = 1;
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tio.c_cc[VTIME] = 0;
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if (tcsetattr(fd, TCSANOW, &tio) != 0) { perror("tcsetattr"); close(fd); return -1; }
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return fd;
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}
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int main(int argc, char *argv[]) {
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const char *port = (argc > 1) ? argv[1] : DEFAULT_PORT;
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speed_t baud = DEFAULT_BAUD;
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int fd = open_serial(port, baud);
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if (fd < 0) return 1;
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uint8_t buf[8192];
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while (1) {
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ssize_t n = read(fd, buf, sizeof(buf));
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if (n > 0) {
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fwrite(buf, 1, n, stdout);
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fflush(stdout);
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}
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}
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close(fd);
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return 0;
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}
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// serial_to_wav.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#define SERIAL_PORT "/dev/ttyESP32_A"
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#define BAUD_RATE B1500000
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#define RATE 16000
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#define CHANNELS 2
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#define BPS 16
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static volatile sig_atomic_t stop_flag = 0;
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void on_sigint(int sig) { (void)sig; stop_flag = 1; }
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// Write RIFF/WAVE header placeholders; sizes will be patched on exit
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void write_wav_header(FILE *f, uint32_t data_bytes) {
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uint32_t byte_rate = RATE * CHANNELS * (BPS/8);
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uint16_t block_align = CHANNELS * (BPS/8);
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uint32_t riff_size = 36 + data_bytes;
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fseek(f, 0, SEEK_SET);
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fwrite("RIFF", 1, 4, f);
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fwrite(&riff_size, 4, 1, f);
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fwrite("WAVE", 1, 4, f);
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fwrite("fmt ", 1, 4, f);
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uint32_t fmt_size = 16;
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fwrite(&fmt_size, 4, 1, f);
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uint16_t audio_fmt = 1;
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fwrite(&audio_fmt, 2, 1, f);
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uint16_t ch = CHANNELS;
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fwrite(&ch, 2, 1, f);
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uint32_t sr = RATE;
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fwrite(&sr, 4, 1, f);
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fwrite(&byte_rate, 4, 1, f);
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fwrite(&block_align, 2, 1, f);
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uint16_t bits = BPS;
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fwrite(&bits, 2, 1, f);
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fwrite("data", 1, 4, f);
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fwrite(&data_bytes, 4, 1, f);
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}
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// Configure serial port for raw 8N1, no flow control, blocking reads
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int open_serial(const char *path) {
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int fd = open(path, O_RDONLY | O_NOCTTY);
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if (fd < 0) { perror("open"); return -1; }
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struct termios tio;
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if (tcgetattr(fd, &tio) != 0) { perror("tcgetattr"); close(fd); return -1; }
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cfsetispeed(&tio, BAUD_RATE);
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cfsetospeed(&tio, BAUD_RATE);
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// Raw mode: disable all translations
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tio.c_iflag &= ~(IGNBRK | BRKINT | ICRNL | INLCR | IXON | IXOFF | IXANY | PARMRK | INPCK | ISTRIP);
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tio.c_oflag &= ~(OPOST);
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tio.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN | ISIG);
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tio.c_cflag &= ~(CSIZE | PARENB | CSTOPB | CRTSCTS);
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tio.c_cflag |= (CS8 | CLOCAL | CREAD);
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// Blocking read: return when at least N bytes available
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tio.c_cc[VMIN] = 1; // at least 1 byte
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tio.c_cc[VTIME] = 0; // no timeout
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if (tcsetattr(fd, TCSANOW, &tio) != 0) { perror("tcsetattr"); close(fd); return -1; }
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return fd;
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}
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int main() {
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signal(SIGINT, on_sigint);
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int fd = open_serial(SERIAL_PORT);
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if (fd < 0) return 1;
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FILE *out = fopen("capture.wav", "wb+");
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if (!out) { perror("fopen"); close(fd); return 1; }
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// Reserve header space
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uint32_t data_bytes = 0;
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fseek(out, 44, SEEK_SET);
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// Capture loop
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uint8_t buf[8192];
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while (!stop_flag) {
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ssize_t n = read(fd, buf, sizeof(buf));
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if (n > 0) {
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fwrite(buf, 1, (size_t)n, out);
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data_bytes += (uint32_t)n;
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}
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}
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// Finalize header
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write_wav_header(out, data_bytes);
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fflush(out);
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fclose(out);
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close(fd);
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fprintf(stderr, "Saved capture.wav with %u bytes of audio\n", data_bytes);
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return 0;
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}
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@ -0,0 +1,10 @@
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#!/bin/bash
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# Start ESP32 audio capture into PulseAudio
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# 1. Ensure null sink exists at 16kHz
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pactl unload-module module-null-sink 2>/dev/null
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pactl load-module module-null-sink sink_name=esp32 rate=16000 channels=2 format=s16le
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# 2. Run serial capture and feed into sink
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/home/littlesophia/serial_audio_catcher/serial_to_stdout /dev/ttyESP32_A | \
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pacat --raw --rate=16000 --channels=2 --format=s16le --device=esp32
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