So, I've been working on porting some C code for recording audio with
OpenAL to python using Pyglets bindings. Everything works out more or less
fine up until I try to copy the recorded samples to a capture buffer for
processing using alcCaptureSamples(), keeps giving "ArgumentError: argument
2: <type 'exceptions.TypeError'>: wrong type". Any suggestions?
--
You received this message because you are subscribed to the Google Groups
"pyglet-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/pyglet-users.
For more options, visit https://groups.google.com/d/optout.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <AL/al.h>
#include <AL/alc.h>
#include <sys/time.h>
int main(void)
{
const ALCchar * devices;
ALCchar * ptr;
ALCdevice * mainDev;
ALCcontext * mainContext;
ALCdevice * captureDev;
ALubyte captureBuffer[1048576];
ALubyte *captureBufPtr;
ALint samplesAvailable;
ALint samplesCaptured;
time_t currentTime;
time_t lastTime;
ALuint buffer;
ALuint source;
ALint playState;
int i;
// Print the list of capture devices
printf("Available playback devices:\n");
devices = alcGetString(NULL, ALC_DEVICE_SPECIFIER);
ptr = devices;
while (ptr[0] != NULL)
{
printf(" %s\n", ptr);
ptr += strlen(ptr) + 1;
}
// Open a playback device and create a context first
printf("Opening playback device:\n");
mainDev = alcOpenDevice(NULL);
if (mainDev == NULL)
{
printf("Unable to open playback device!\n");
exit(1);
}
devices = alcGetString(mainDev, ALC_DEVICE_SPECIFIER);
printf(" opened device '%s'\n", devices);
mainContext = alcCreateContext(mainDev, NULL);
if (mainContext == NULL)
{
printf("Unable to create playback context!\n");
exit(1);
}
printf(" created playback context\n");
// Make the playback context current
alcMakeContextCurrent(mainContext);
alcProcessContext(mainContext);
// Print the list of capture devices
printf("Available capture devices:\n");
devices = alcGetString(NULL, ALC_CAPTURE_DEVICE_SPECIFIER);
ptr = devices;
while (ptr[0] != NULL)
{
printf(" %s\n", ptr);
ptr += strlen(ptr) + 1;
}
// Open the default device
printf("Opening capture device:\n");
captureDev = alcCaptureOpenDevice(NULL, 8000, AL_FORMAT_MONO16, 800);
if (captureDev == NULL)
{
printf(" Unable to open device!\n");
exit(1);
}
devices = alcGetString(captureDev, ALC_CAPTURE_DEVICE_SPECIFIER);
printf(" opened device %s\n", devices);
// Wait for three seconds to prompt the user
for (i = 3; i > 0; i--)
{
printf("Starting capture in %d...\r", i);
fflush(stdout);
lastTime = time(NULL);
currentTime = lastTime;
while (currentTime == lastTime)
{
currentTime = time(NULL);
usleep(100000);
}
}
printf("Starting capture NOW!\n");
fflush(stdout);
lastTime = currentTime;
// Capture (roughly) five seconds of audio
alcCaptureStart(captureDev);
samplesCaptured = 0;
captureBufPtr = captureBuffer;
while (currentTime < (lastTime + 5))
{
// Get the number of samples available
alcGetIntegerv(captureDev, ALC_CAPTURE_SAMPLES, 1, &samplesAvailable);
// Copy the samples to our capture buffer
if (samplesAvailable > 0)
{
alcCaptureSamples(captureDev, captureBufPtr, samplesAvailable);
samplesCaptured += samplesAvailable;
printf("Captured %d samples (adding %d)\r", samplesCaptured,
samplesAvailable);
fflush(stdout);
// Advance the buffer (two bytes per sample * number of samples)
captureBufPtr += samplesAvailable * 2;
}
// Wait for a bit
usleep(10000);
// Update the clock
currentTime = time(NULL);
}
printf("\nPausing capture.\n");
alcCaptureStop(captureDev);
// Wait for three seconds to prompt the user
for (i = 3; i > 0; i--)
{
printf("Resuming capture in %d...\r", i);
fflush(stdout);
lastTime = time(NULL);
currentTime = lastTime;
while (currentTime == lastTime)
{
currentTime = time(NULL);
usleep(100000);
}
}
printf("Resuming capture NOW!\n");
fflush(stdout);
lastTime = currentTime;
// Capture (roughly) five seconds of audio
alcCaptureStart(captureDev);
while (currentTime < (lastTime + 5))
{
// Get the number of samples available
alcGetIntegerv(captureDev, ALC_CAPTURE_SAMPLES, 1, &samplesAvailable);
// Copy the samples to our capture buffer
if (samplesAvailable > 0)
{
alcCaptureSamples(captureDev, captureBufPtr, samplesAvailable);
samplesCaptured += samplesAvailable;
printf("Captured %d samples (adding %d)\r", samplesCaptured,
samplesAvailable);
fflush(stdout);
// Advance the buffer (two bytes per sample * number of samples)
captureBufPtr += samplesAvailable * 2;
}
// Wait for a bit
usleep(10000);
// Update the clock
currentTime = time(NULL);
}
printf("\nDone capturing.\n");
alcCaptureStop(captureDev);
// Play back the captured data
printf("Starting playback...\n");
fflush(stdout);
// Generate an OpenAL buffer for the captured data
alGenBuffers(1, &buffer);
alGenSources(1, &source);
alBufferData(buffer, AL_FORMAT_MONO16, captureBuffer,
samplesCaptured*2, 8000);
alSourcei(source, AL_BUFFER, buffer);
alSourcePlay(source);
// Wait for the source to stop playing
playState = AL_PLAYING;
while (playState == AL_PLAYING)
{
printf(" source %d is playing...\r", source);
fflush(stdout);
alGetSourcei(source, AL_SOURCE_STATE, &playState);
usleep(100000);
}
printf("\nDone with playback.\n");
fflush(stdout);
// Shut down OpenAL
alDeleteSources(1, &source);
alDeleteBuffers(1, &buffer);
alcMakeContextCurrent(NULL);
alcCloseDevice(mainDev);
alcCaptureCloseDevice(captureDev);
} #using Pyglet
from pyglet.media.drivers.openal import lib_openal as al
from pyglet.media.drivers.openal import lib_alc as alc
import time
class Example(object):
def __init__(self):
#load listener
self.listener = listener()
#wait for recording
time.sleep(5)
#capture audio
self.listener.cap()
#clean up resources
self.listener.delete()
#load a listener to load and play sounds.
class listener(object):
def __init__(self):
#load device/context/listener
self.device = alc.alcOpenDevice(None)
self.context = alc.alcCreateContext(self.device, None)
alc.alcMakeContextCurrent(self.context)
alc.alcProcessContext(self.context)
#list capture devices
devices = alc.alcGetString(None, alc.ALC_CAPTURE_DEVICE_SPECIFIER);
print devices[:200]
#open default device
self.captureDev = alc.alcCaptureOpenDevice(None, 8000, al.AL_FORMAT_MONO16, 800);
#check which device is loaded
devices = alc.alcGetString(self.captureDev, alc.ALC_CAPTURE_DEVICE_SPECIFIER);
print devices[:100]
#create buffer for storing captured audio
self.buf = al.ALubyte(1048576)
#start capturing
alc.alcCaptureStart(self.captureDev)
#check number of captured samples
self.s_available = al.ALint(0)
alc.alcGetIntegerv(self.captureDev, alc.ALC_CAPTURE_SAMPLES, 1, self.s_available)
print self.s_available.value
def cap(self):
#check number of captured samples
alc.alcGetIntegerv(self.captureDev, alc.ALC_CAPTURE_SAMPLES, 1, self.s_available)
print self.s_available.value
#----------------------------------------------------------------------------------\
#store audio in buffer
alc.alcCaptureSamples(self.captureDev, self.buf, self.s_available)
#----------------------------------------------------------------------------------/
#delete current listener
def delete(self):
alc.alcDestroyContext(self.context)
alc.alcCloseDevice(self.device)
alc.alcCaptureCloseDevice(self.captureDev)
Example()
