testcapture.c
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/*
* This is a test program for the ALC_EXT_capture extension. This
* test code is public domain and comes with NO WARRANTY.
*
* Written by Ryan C. Gordon <icculus@icculus.org>
*/
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "AL/al.h"
#include "AL/alc.h"
static ALCdevice* (*alcCaptureOpenDevice)(const ALubyte *deviceName,
ALuint freq, ALenum fmt,
ALsizei bufsize);
static ALvoid (*alcCaptureCloseDevice)(ALCdevice *device);
static ALvoid (*alcCaptureStart)(ALCdevice *device);
static ALvoid (*alcCaptureStop)(ALCdevice *device);
static ALvoid (*alcCaptureSamples)(ALCdevice *device, ALvoid *buf,
ALsizei samps);
ALenum _AL_FORMAT_MONO_FLOAT32 = 0;
ALenum _AL_FORMAT_STEREO_FLOAT32 = 0;
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#define FMT AL_FORMAT_MONO16
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#define FMTSIZE 8
#define FREQ 44100
#define SAMPS (FREQ * 5)
static ALbyte buf[SAMPS * FMTSIZE];
static ALCdevice *in = NULL;
ALvoid *recordSomething(void)
{
ALint samples = 0;
ALenum capture_samples = alcGetEnumValue(in, "ALC_CAPTURE_SAMPLES");
printf("recording...\n");
alcCaptureStart(in);
while (samples < SAMPS)
{
alcGetIntegerv(in, capture_samples, sizeof (samples), &samples);
usleep(10000);
} // while
alcCaptureSamples(in, buf, SAMPS);
alcCaptureStop(in);
return(buf); // buf has SAMPS samples of FMT audio at FREQ.
} // recordSomething
int main(int argc, char **argv)
{
ALboolean ext;
ALuint sid;
ALuint bid;
ALint state = AL_PLAYING;
if (!alcIsExtensionPresent(NULL, "ALC_EXT_capture"))
{
fprintf(stderr, "No ALC_EXT_capture support.\n");
return(42);
} // if
#define GET_PROC(x) x = alcGetProcAddress(NULL, (ALubyte *) #x)
GET_PROC(alcCaptureOpenDevice);
GET_PROC(alcCaptureCloseDevice);
GET_PROC(alcCaptureStart);
GET_PROC(alcCaptureStop);
GET_PROC(alcCaptureSamples);
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// these may not exist, depending on the implementation.
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_AL_FORMAT_MONO_FLOAT32 = alGetEnumValue((ALubyte *) "AL_FORMAT_MONO_FLOAT32");
_AL_FORMAT_STEREO_FLOAT32 = alGetEnumValue((ALubyte *) "AL_FORMAT_STEREO_FLOAT32");
alGetError();
#define printALCString(dev, ext) { ALenum e = alcGetEnumValue(dev, #ext); printf("%s: %s\n", #ext, alcGetString(dev, e)); }
printALCString(NULL, ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER);
ext = alcIsExtensionPresent(NULL, "ALC_ENUMERATION_EXT");
if (!ext)
printf("No ALC_ENUMERATION_EXT support.\n");
else
{
char *devList;
ALenum alenum = alcGetEnumValue(NULL, "ALC_CAPTURE_DEVICE_SPECIFIER");
devList = (char *)alcGetString(NULL, alenum);
printf("ALC_ENUMERATION_EXT:\n");
while (*devList) // I really hate this double null terminated list thing.
{
printf(" - %s\n", devList);
devList += strlen(devList) + 1;
} // while
} // else
alutInit(&argc, argv);
in = alcCaptureOpenDevice(NULL, FREQ, FMT, SAMPS);
if (in == NULL)
{
fprintf(stderr, "Couldn't open capture device.\n");
alutExit();
return(42);
} // if
recordSomething();
alcCaptureCloseDevice(in);
alGenSources(1, &sid);
alGenBuffers(1, &bid);
printf("Playing...\n");
alBufferData(bid, FMT, buf, sizeof (buf), FREQ);
alSourcei(sid, AL_BUFFER, bid);
alSourcePlay(sid);
while (state == AL_PLAYING)
{
usleep(100000);
alGetSourcei(sid, AL_SOURCE_STATE, &state);
} // while
printf("Cleaning up...\n");
alDeleteSources(1, &sid);
alDeleteBuffers(1, &bid);
alutExit();
return(0);
} // main
// end of testcapture.c ...