Record sound

Record sound
You are encouraged to solve this task according to the task description, using any language you may know.

Record a monophonic 16-bit PCM sound into either memory space, a file or array.

(This task neglects to specify the sample rate, and whether to use signed samples. The programs in this page might use signed 16-bit or unsigned 16-bit samples, at 8000 Hz, 44100 Hz, or any other sample rate. Therefore, these programs might not record sound in the same format.)

C

Read/write raw device /dev/dsp. On Linux you need access to said device, meaning probably you should be in audio user group.

<lang c>#include <stdlib.h>

1. include <unistd.h>
2. include <sys/types.h>
3. include <fcntl.h>

void * record(size_t bytes) { int fd; if (-1 == (fd = open("/dev/dsp", O_RDONLY))) return 0; void *a = malloc(bytes); read(fd, a, bytes); close(fd); return a; }

int play(void *buf, size_t len) { int fd; if (-1 == (fd = open("/dev/dsp", O_WRONLY))) return 0; write(fd, buf, len); close(fd); return 1; }

int main() { void *p = record(65536); play(p, 65536); return 0; }</lang>

GUISS

Here we activate the Microsoft Windows '95 Sound Recorder:

<lang guiss>Start,Programs,Accessories,Sound Recorder,Button:Record</lang>

PicoLisp

<lang PicoLisp>(in '(rec -q -c1 -tu16 - trim 0 2) # Record 2 seconds

  (make
     (while (rd 2)
        (link @) ) ) )</lang>

Output:

-> (16767 19071 17279 ... 5503 9343 14719)  # 96000 numbers

Python

<lang python>import pyaudio

chunk = 1024 FORMAT = pyaudio.paInt16 CHANNELS = 1 RATE = 44100

p = pyaudio.PyAudio()

stream = p.open(format = FORMAT,

               channels = CHANNELS,
               rate = RATE,
               input = True,
               frames_per_buffer = chunk)

data = stream.read(chunk) print [ord(i) for i in data]</lang>

Tcl

Library: Snack

<lang tcl>package require sound

1. Helper to do a responsive wait

proc delay t {after $t {set ::doneDelay ok}; vwait ::doneDelay}

1. Make an in-memory recording object

set recording [snack::sound -encoding "Lin16" -rate 44100 -channels 1]

1. Set it doing the recording, wait for a second, and stop

$recording record -append true delay 1000 $recording stop

1. Convert the internal buffer to viewable numbers, and print them out

binary scan [$recording data -byteorder littleEndian] s* words puts [join $words ", "]

1. Destroy the recording object

$recording destroy</lang>