Record sound: Difference between revisions
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data = stream.read(chunk)
print [ord(i) for i in data]</lang>
=={{header|Racket}}==
{{trans|C}}
<lang racket>
#lang racket
(define (record n) (with-input-from-file "/dev/dsp" ( () (read-bytes n))))
(define (play bs) (display-to-file bs "/dev/dsp" #:exists 'append))
(play (record 65536))
</lang>
=={{header|Tcl}}==
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Revision as of 00:59, 29 May 2013
![Task](http://static.miraheze.org/rosettacodewiki/thumb/b/ba/Rcode-button-task-crushed.png/64px-Rcode-button-task-crushed.png)
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.)
BBC BASIC
<lang bbcbasic> wavfile$ = @dir$ + "capture.wav"
bitspersample% = 16 channels% = 2 samplespersec% = 44100 alignment% = bitspersample% * channels% / 8 bytespersec% = alignment% * samplespersec% params$ = " bitspersample " + STR$(bitspersample%) + \ \ " channels " + STR$(channels%) + \ \ " alignment " + STR$(alignment%) + \ \ " samplespersec " + STR$(samplespersec%) + \ \ " bytespersec " + STR$(bytespersec%) SYS "mciSendString", "close all", 0, 0, 0 SYS "mciSendString", "open new type waveaudio alias capture", 0, 0, 0 SYS "mciSendString", "set capture" + params$, 0, 0, 0 TO res% IF res% ERROR 100, "Couldn't set capture parameters: " + STR$(res% AND &FFFF) PRINT "Press SPACE to start recording..." REPEAT UNTIL INKEY(1) = 32 SYS "mciSendString", "record capture", 0, 0, 0 TO res% IF res% ERROR 100, "Couldn't start audio capture: " + STR$(res% AND &FFFF) PRINT "Recording, press SPACE to stop..." REPEAT UNTIL INKEY(1) = 32 SYS "mciSendString", "stop capture", 0, 0, 0 SYS "mciSendString", "save capture " + wavfile$, 0, 0, 0 TO res% IF res% ERROR 100, "Couldn't save to WAV file: " + STR$(res% AND &FFFF) SYS "mciSendString", "delete capture", 0, 0, 0 SYS "mciSendString", "close capture", 0, 0, 0 PRINT "Captured audio is stored in " wavfile$</lang>
C
Read/write raw device /dev/dsp
. On Linux you need access to said device, meaning probably you should be in audio user group.
<lang c>#include <stdlib.h>
- include <unistd.h>
- include <sys/types.h>
- include <fcntl.h>
void * record(size_t bytes) { int fd; if (-1 == (fd = open("/dev/dsp", O_RDONLY))) return 0; void *a = malloc(bytes); read(fd, a, bytes); close(fd); return a; }
int play(void *buf, size_t len) { int fd; if (-1 == (fd = open("/dev/dsp", O_WRONLY))) return 0; write(fd, buf, len); close(fd); return 1; }
int main() { void *p = record(65536); play(p, 65536); return 0; }</lang>
GUISS
Here we activate the Microsoft Windows '95 Sound Recorder:
<lang guiss>Start,Programs,Accessories,Sound Recorder,Button:Record</lang>
Liberty BASIC
LB can easily send a MCI string to the OS, or extra routines eg SOX, so a minimal solution could be <lang lb> run "sndrec32.exe" </lang> A more direct way is.. <lang lb>
print "Starting 5 sec. recording..." r$ =mciSendString$( "open new type waveaudio alias capture") r$ =mciSendString$( "set capture time format ms bitspersample 16") r$ =mciSendString$( "set capture channels 1 samplespersec 8000") r$ =mciSendString$( "set capture alignment 1 bytespersec 8000") r$ =mciSendString$( "record capture") timer 5000, [on] wait [on] timer 0 print " .... now stopping the recording." r$ =mciSendString$( "stop capture") r$ =mciSendString$( "save capture " +chr$( 34) +"sample.wav" +chr$( 34)) r$ =mciSendString$( "close capture") print "Done recording." r$=mciSendString$( "open " +q$ +"sample.wav" +q$ +" type waveaudio alias sfx") r$=mciSendString$( "play sfx wait") r$=mciSendString$( "close sfx") print "Done playing back." end
function mciSendString$( s$)
print s$ buffer$ =space$( 1024) +chr$( 0) calldll #winmm, "mciSendStringA", s$ as ptr, buffer$ as ptr, 1028 as long, 0 as long, r as long buffer$ =left$( buffer$, instr( buffer$, chr$( 0)) -1) if r >0 then mciSendString$ ="error" print "returned "; mciSendString$ else mciSendString$ =""'buffer$ print "OK" end if
end function </lang>
Mathematica
<lang Mathematica>SystemDialogInput["RecordSound"]</lang>
OCaml
<lang ocaml>#load "unix.cma"
let record bytes =
let buf = String.make bytes '\000' in let ic = open_in "/dev/dsp" in let chunk = 4096 in for i = 0 to pred (bytes / chunk) do ignore (input ic buf (i * chunk) chunk) done; close_in ic; (buf)
let play buf len =
let oc = open_out "/dev/dsp" in output_string oc buf; close_out oc
let () =
let bytes = 65536 in let p = record bytes in play p bytes</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>
Racket
<lang racket>
- lang racket
(define (record n) (with-input-from-file "/dev/dsp" ( () (read-bytes n)))) (define (play bs) (display-to-file bs "/dev/dsp" #:exists 'append)) (play (record 65536)) </lang>
Tcl
<lang tcl>package require sound
- Helper to do a responsive wait
proc delay t {after $t {set ::doneDelay ok}; vwait ::doneDelay}
- Make an in-memory recording object
set recording [snack::sound -encoding "Lin16" -rate 44100 -channels 1]
- Set it doing the recording, wait for a second, and stop
$recording record -append true delay 1000 $recording stop
- Convert the internal buffer to viewable numbers, and print them out
binary scan [$recording data -byteorder littleEndian] s* words puts [join $words ", "]
- Destroy the recording object
$recording destroy</lang>