TQ2440 UDA1341 錄音及播放問題附代碼

haa14618 · 发表于 2012-2-15 00:02:05

本帖最后由 haa14618 于 2012-2-15 00:04 编辑

//錄音
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include <linux/soundcard.h>
#include <termios.h>
#define LENGTH 30
#define RATE 44100
#define SIZE 16
#define CHANNELS 2
#define RSIZE 100
#define AUDIO_DEV_FILE "/dev/dsp"
unsigned char buf[RSIZE];
struct fhead{
unsigned char a[4];
long int b;
unsigned char c[4];
unsigned char d[4];
long int e;
short int f;
short int g;
long int h;
long int i;
short int j;
short int k;
unsigned char p[4];
long int q;
} wavehead;
int set_wav_arg(void)
{
wavehead.a[0] = 'R';
wavehead.a[1] = 'I';
wavehead.a[2] = 'F';
wavehead.a[3] = 'F';
// wavehead.b = LENGTH * RATE * CHANNELS * SIZE / 8 - 8;
wavehead.c[0] = 'W';
wavehead.c[1] = 'A';
wavehead.c[2] = 'V';
wavehead.c[3] = 'E';
wavehead.d[0] = 'f';
wavehead.d[1] = 'm';
wavehead.d[2] = 't';
wavehead.d[3] = ' ';
wavehead.e = 16;
wavehead.f = 2;
wavehead.g = CHANNELS;
wavehead.h = RATE;
wavehead.i = RATE * CHANNELS * SIZE / 8;
wavehead.j = CHANNELS * SIZE / 8;
wavehead.k = SIZE;
wavehead.p[0] = 'd';
wavehead.p[1] = 'a';
wavehead.p[2] = 't';
wavehead.p[3] = 'a';
// wavehead.q = LENGTH * RATE * CHANNELS * SIZE / 8;
}
int recodred(void)
{
int status;
int fd_f;
int fd_dev_r;
int arg;
fd_dev_r = open(AUDIO_DEV_FILE, O_RDONLY, 0777);
if (fd_dev_r < 0)
{
perror("Cannot open device");
return 1;
}
/*
arg = 16;
ioctl(fd_dev_r,SOUND_PCM_WRITE_BITS, &arg);
arg = 2;
ioctl(fd_dev_r,SOUND_PCM_WRITE_CHANNELS, &arg);
arg = 44100;
ioctl(fd_dev_r,SOUND_PCM_WRITE_RATE, &arg);
*/
/*
arg = 16;
ioctl(fd_dev_r,SNDCTL_DSP_SETFMT, &arg);
arg = 2;
ioctl(fd_dev_r,SNDCTL_DSP_CHANNELS, &arg);
arg = 44100;
ioctl(fd_dev_r,SNDCTL_DSP_SPEED, &arg);
*/
system("rm -f *.wav");
if((fd_f = open("./sound.wav", O_CREAT | O_RDWR, 0777)) == -1)
{
perror("cannot creat the sound file");
}
if((status = write(fd_f, &wavehead, sizeof(wavehead))) == -1)
{
perror("write to sound'head wrong!!");
}
while(1)
{
status = read(fd_dev_r, buf, sizeof(buf));
if (status != sizeof(buf))
{
perror("read wrong number of bytes");
}
if (write(fd_f, buf, status) == -1)
{
perror("write to sound wrong!!");
}
}
close(fd_dev_r);
close(fd_f);
}
int main(void)
{
int fd_dev_r;
set_wav_arg();
recodred();
}

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//播放
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include <linux/soundcard.h>
#include <termios.h>
#define RSIZE 100
#define AUDIO_DEV_FILE "/dev/dsp"
unsigned char buf[RSIZE];
int read_wav(void)
{
int status;
int fd_f;
int fd_dev_w;
fd_dev_w = open(AUDIO_DEV_FILE, O_WRONLY, 0777);
if (fd_dev_w < 0)
{
perror("Cannot open device");
return 1;
}
printf("Play...:\n");
if ((fd_f = open("./sound.wav", O_RDONLY, 0777)) == -1)
{
perror("cannot creat the sound file");
}
lseek(fd_f, 44, SEEK_SET);
while(1)
{
status = read(fd_f, buf, sizeof(buf));
if(status == 0)
break;
if(status != sizeof(buf))
{
perror("write wrong number of bytes");
}
status = write(fd_dev_w, buf, sizeof(buf));
if (status != sizeof(buf))
{
perror("wrote2 wrong number of bytes");
}
}
close(fd_f);
close(fd_dev_w);
return 0;
}
int main(void)
{
read_wav();
return 0;
}

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[/code]

問題1：
試過了幾種方法，設定採樣、量化及聲道發現
SOUND_PCM_WRITE_及SNDCTL_DSP_兩種方式
錄出來的檔案，都無法播放
是不是我那設定錯誤？？？

問題2：
使用fhead所儲存的檔案是可以播放的
但是問題又來了，
播放的時候會有延遲，要等一段時間才有聲音
後來我用lseek();函數讀取後面的字節
是可以正常的播放
但是換一個錄音檔就會有問題，
不知道是錄音時還是播放的關係？？？

問題3：
我把在板子上可以播放的檔案
抓到WINDOWS 7 底下播放
會出現格式錯誤的訊息
是還有哪裡設定不對嗎？？？

求助啊！！！:'(