int main(void)
{
int fd;
short *value;
int i = 0;
if ( ( fd = open( "/dev/dsp", O_RDWR ) ) == -1 ) {
perror( "open()" );
return 1;
}
if ( setup_dsp( fd ) != 0 ) {
fprintf( stderr, "Setup /dev/dsp failed.\n" );
close( fd );
return 1;
}
while(read(fd, value, sizeof(short) > 0)){
printf("%d\n", *value);
}
close( fd );
return 0;
}
int music::play_music()
{
MainWindow *mine=(MainWindow*)arg;
mine->my_words();
int music_len;
long rate;
char* buf;
long n;
int min;
min=ftell(music_fp);
music_len = head.ChunkSize+8;
mine->set_line(music_len,min);
///安装dsp 设置 采样率 声道个数
if(setup_dsp(dsp_fd,head.SampleRate,head.NumChannels) != 0)
{
perror("setup_dsp failed");
return -1;
}
////生效setup_dsp设置
if(sync_dsp(dsp_fd) != 0)
{
perror("sync dsp failed");
return -1;
}
//-----设置采样率--------
//采样位数＊采样率/8 = 字节数量
//＋7 方式采样率不是8的整数倍的情况
// /8*2 = /4 都按照双声道处理
//size = (head.BitsPerSample*head.SampleRate+7)>>2;
rate = head.ByteRate; //每次读取的字节 = 字节速率
buf = (char*)malloc(rate); //音乐数据缓存
if(buf != NULL)
{
do{
pthread_mutex_lock(&my_mutex);
pthread_mutex_unlock(&my_mutex);
mine->word_move();
n = fread(buf,1,rate,music_fp);
//cout<<"n:"<<n<<endl;
if(n > 0)
{
write(dsp_fd,buf,n);
}
if(feof(music_fp))
{
perror("play over.");
break;
}
mine->add_second();
mine->move_line(ftell(music_fp));
this->set_vol();
}while(1);
}
return 1;
}