I bought a hauppauge bttv Bt878 winTV to record audio
from the FM tuner. Low static is more important than
stereo because I am recording voice interviews, not music.
The station I am interested comes in with no static if
I hit the Mono button on the Windows radio program. I am
trying to replicate this in Linux (RH 7.0).
I wrote a small program to turn on the radio and set
video_audio.mode it doesn't seem to have an effect:
typedef unsigned long ulong;
#include <iostream.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/videodev.h>
int main(int argc, char *argv[])
{
ulong freq = 1454; // 90.9 * 16
video_audio va;
video_tuner vt;
int fd = open("/dev/radio0", O_RDWR);
ioctl(fd, VIDIOCSFREQ, &freq);
ioctl(fd, VIDIOCGAUDIO, &va);
cout << "va.audio = " << va.audio << endl
<< "va.volume = " << va.volume << endl
<< "va.bass = " << va.bass << endl
<< "va.treble = " << va.treble << endl
<< "va.flags = " << va.flags << endl
<< "va.name = " << va.name << endl
<< "va.mode = " << va.mode << endl
<< "va.balance = " << va.balance << endl
<< "va.step = " << va.step << endl
<< endl;
va.mode = 2;
ioctl(fd, VIDIOCSAUDIO, &va);
ioctl(fd, VIDIOCGAUDIO, &va);
cout << "va.mode = " << va.mode << endl;
return(0);
}
This yielded
va.audio = 0
va.volume = 65535
va.bass = 32768
va.treble = 32768
va.flags = 30
va.name = TV
va.mode = 1
va.balance = 0
va.step = 0
va.mode = 1
I also had the msp3400 module loaded with debug=1 and the following
was in /var/log/messages
Dec 13 15:42:47 localhost kernel: msp3400: setvolume: 0:0 0x00 0x00
Dec 13 15:42:47 localhost kernel: msp3400: setvolume: 0:0 0x00 0x00
Dec 13 15:42:47 localhost kernel: msp3400: setmode: 0
Dec 13 15:42:48 localhost kernel: msp3400: setvolume: 0:0 0x00 0x00
Dec 13 15:42:48 localhost kernel: msp3400: setmode: 2
Dec 13 15:42:48 localhost kernel: msp3400: setvolume: 65535:65535 0x73
0x00
Dec 13 15:42:48 localhost kernel: msp3400: carrier1 val: -10888 / 4.5
NTSC
Dec 13 15:42:48 localhost kernel: msp3400: carrier1 val: -3969 / 5.5
PAL B/G
Dec 13 15:42:48 localhost kernel: msp3400: setvolume: 65535:65535 0x73
0x00
Dec 13 15:42:48 localhost kernel: msp3400: setbass: 32768 0x00
Dec 13 15:42:48 localhost kernel: msp3400: settreble: 32768 0x00
Dec 13 15:42:48 localhost kernel: msp3400: carrier1 val: -1955 / 6.0
PAL I
Dec 13 15:42:48 localhost kernel: msp3400: carrier1 val: -2299 / 6.5
PAL D/K + SAT + SECAM
Dec 13 15:42:48 localhost kernel: msp3400: setmode: 3
Dec 13 15:42:48 localhost kernel: msp3400: FM setstereo: 1
Dec 13 15:42:48 localhost kernel: msp3400: setvolume: 65535:65535 0x73
0x00
Dec 13 15:42:48 localhost kernel: msp3400: mono sound carrier: 0.000 MHz
Does anyone know what I am doing wrong?
Thanks,
Will Heyman
heyman@xxxxxxxx
