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darkeye
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Hi, I'm new to MacOS programming, but have considerable background in different UNIX systems. I'm trying to port my project, DarkIce to MacOS. For this, I need to be able to simply record audio from an audio device. More precisely: - open the audio device
- configure for appropriate parameters (e.g. 44.1kHz, 16 bit, 2 channel, PCM recording)
- read from the device
- close the device
for example, on Solaris / OpenBSD / NetBSD, the following code achieves just this: CODE #include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <sys/ioctl.h> #include <errno.h> #include <sys/audioio.h>
#define FILE_NAME "/dev/audio" #define SAMPLE_RATE 22050 #define CHANNEL 2 #define BITS_PER_SAMPLE 16 #define BUF_SIZE 4
int main(int argc, char **argv) { int fd; audio_info_t audioInfo; unsigned char buf[BUF_SIZE]; unsigned int len = BUF_SIZE; ssize_t ret;
fd = open( FILE_NAME, O_RDONLY);
AUDIO_INITINFO( &audioInfo); audioInfo.record.sample_rate = SAMPLE_RATE; audioInfo.record.channels = CHANNEL; audioInfo.record.precision = BITS_PER_SAMPLE; audioInfo.record.encoding = AUDIO_ENCODING_LINEAR;
if ( ioctl(fd, AUDIO_SETINFO, &audioInfo) ) { printf("can't set audio info, error: %d\n", errno); }
ret = read(fd, buf, len);
printf("%d returned by read\n", ret); if ( ret == -1 ) { printf("error code %d\n", errno); }
close(fd);
return 0; } What I hear is that MacOS uses a callback pattern to access audio data from the sound card. if so, probably I'm looking for a sample that does: - initialize the whole thing
- set the audio parameters (e.g. 44.1kHz 16 bit stereo PCM recording)
- register my callback function
- shut down
Can anyone help me?
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