#include
#include
#include
#include
#include
#include
#include
#include
typedef struct _WAVEFILE_HEADER//波形文件头结构体
{
char ChunkID[4]; //"RIFF"
long ChunkSize; //整个文件大小-8bytes
char Format[4]; //"wave"
char Subchunk1ID[3]; //"fmt" 表示以下是format chunck
long Subchunk1Size; //格式数据的字节数 一般是16,特殊的也有18
short AudioFormat; //编码方式
short NumChannels; //声道数量
long SampleRate; //采样率
long ByteRate; //每秒所需字节数
short BlockAlign; //每次采样需要的字节数
short BitsPerSample; //每个采样需要的bit数
char Subchunk2ID[3]; //'dat'字符串,标识以下是数据
long Subchunk2Size; //数据的大小
}WAVEFILE_HEADER;
///安装dsp 设置 采样率 声道个数
int setup_dsp(int dsp_fd,int rate,int channels)
{
int format;
if( ioctl(dsp_fd,SNDCTL_DSP_STEREO,&channels) == -1 )
{
perror("ioctl sterr failed");
return -1;
}
switch(channels)
{
case 0:
format = AFMT_U8;
break;
case 1:
format = AFMT_S16_LE;
break;
default:
perror("unsuport channels");
return -1;
}
if(ioctl(dsp_fd,SNDCTL_DSP_SETFMT,&format) == -1)
{
perror("ioctl set formalt");
return -1;
}
if(format!=AFMT_S16_LE)
{
perror("dddddddd\n");
return -1;
}
if(ioctl(dsp_fd,SNDCTL_DSP_SPEED,&rate) == -1)
{
perror("ioctl set_speed failed");
return -1;
}
return 0;
}
///设置同步播放
int sync_dsp(int dsp_fd)
{
if(ioctl(dsp_fd,SNDCTL_DSP_SYNC,0) != 0)
{
perror("ioctl sync failed");
return -1;
}
return 0;
}
int play_music(char* music_name ,int dsp_fd)
{
WAVEFILE_HEADER head;
FILE* music_fp;
int music_len;
long rate;
char* buf;
long n;
//打开 音乐文件
music_fp = fopen(music_name,"r+");
if(music_fp == NULL)
{
perror("fopen music file failed");
return -1;
}
//读取音乐文件头
if(fread(&head,sizeof(head),1,music_fp) != 1 )
{
perror("fread head err");
return -1;
}
//验证文件头
if(memcmp(&head.ChunkID,"RIFF",4) != 0 )
{
perror("music head chunkId err");
return -1;
}
//验证比特率
if(head.BitsPerSample == 32)
{
perror("unsuport samply size ");
return -1;
}
music_len = head.ChunkSize+8;
printf("music_len :%d",music_len);
///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
printf("rate:%ld\n",rate);
//打印需要播放的总时间
printf("music time:%d",head.Subchunk2Size/head.ByteRate);
if(buf != NULL)
{
do{
n = fread(buf,1,rate,music_fp);
printf("n:%ld\n",n);
if(n > 0)
{
write(dsp_fd,buf,n);
}
if(feof(music_fp))
{
perror("play over.");
break;
}
}while(1);
}
}
int main(int argc,char** argv)
{
int dsp_fd;
if(access(argv[1],R_OK))
{
perror("access failed");
exit(0);
}
dsp_fd = open("/dev/dsp",O_WRONLY);
if(dsp_fd< 0)
{
perror("open dsp err");
exit(0);
}
play_music(argv[1],dsp_fd);
}
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