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linux下alsa架構音頻驅動播放wav格式文件

本文轉載自   查看原文   2017-01-09 14:41   2945    ROS機器人語音交互/ ROS學習 
#include<stdio.h>
#include<stdlib.h>
#include <string.h>
#include <alsa/asoundlib.h>




struct WAV_HEADER
{
    char rld[4]; //riff 標志符號
    int rLen; 
    char wld[4]; //格式類型（wave）
    char fld[4]; //"fmt"

    int fLen; //sizeof(wave format matex)
    
    short wFormatTag; //編碼格式
    short wChannels; //聲道數
    int nSamplesPersec ; //采樣頻率
    int nAvgBitsPerSample;//WAVE文件采樣大小
    short wBlockAlign; //塊對齊
    short wBitsPerSample; //WAVE文件采樣大小
    
    char dld[4]; //”data“
    int wSampleLength; //音頻數據的大小

} wav_header;

int set_pcm_play(FILE *fp);

int main(int argc,char *argv[])
{

    if(argc!=2)
    {
        printf("Usage:wav-player+wav file name\n");
        exit(1);
    }

    int nread;
    FILE *fp;
    fp=fopen(argv[1],"rb");
    if(fp==NULL)
    {
        perror("open file failed:\n");
        exit(1);
    }
    
    nread=fread(&wav_header,1,sizeof(wav_header),fp);
    printf("nread=%d\n",nread);
    
    //printf("RIFF 標志%s\n",wav_header.rld);
    printf("文件大小rLen：%d\n",wav_header.rLen);
    //printf("wld=%s\n",wav_header.wld);
    //printf("fld=%s\n",wav_header.fld);
    
   // printf("fLen=%d\n",wav_header.fLen);
    
    //printf("wFormatTag=%d\n",wav_header.wFormatTag);
    printf("聲道數：%d\n",wav_header.wChannels);
    printf("采樣頻率：%d\n",wav_header.nSamplesPersec);
    //printf("nAvgBitsPerSample=%d\n",wav_header.nAvgBitsPerSample);
    //printf("wBlockAlign=%d\n",wav_header.wBlockAlign);
    printf("采樣的位數：%d\n",wav_header.wBitsPerSample);
    
   // printf("data=%s\n",wav_header.dld);
    printf("wSampleLength=%d\n",wav_header.wSampleLength);
    
    
    
    
    
    set_pcm_play(fp);
    return 0;
}

int set_pcm_play(FILE *fp)
{
        int rc;
        int ret;
        int size;
        snd_pcm_t* handle; //PCI設備句柄
        snd_pcm_hw_params_t* params;//硬件信息和PCM流配置
        unsigned int val;
        int dir=0;
        snd_pcm_uframes_t frames;
        char *buffer;
        int channels=wav_header.wChannels;
        int frequency=wav_header.nSamplesPersec;
        int bit=wav_header.wBitsPerSample;
        int datablock=wav_header.wBlockAlign;
        unsigned char ch[100]; //用來存儲wav文件的頭信息
    
    
        
        rc=snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0);
        if(rc<0)
        {
                perror("\nopen PCM device failed:");
                exit(1);
        }


        snd_pcm_hw_params_alloca(&params); //分配params結構體
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_alloca:");
                exit(1);
        }
         rc=snd_pcm_hw_params_any(handle, params);//初始化params
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_any:");
                exit(1);
        }
        rc=snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED); //初始化訪問權限
        if(rc<0)
        {
                perror("\nsed_pcm_hw_set_access:");
                exit(1);

        }

        //采樣位數
        switch(bit/8)
        {
        case 1:snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_U8);
                break ;
        case 2:snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);
                break ;
        case 3:snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S24_LE);
                break ;

        }
        rc=snd_pcm_hw_params_set_channels(handle, params, channels); //設置聲道,1表示單聲>道，2表示立體聲
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_set_channels:");
                exit(1);
        }
        val = frequency;
        rc=snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir); //設置>頻率
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_set_rate_near:");
                exit(1);
        }

        rc = snd_pcm_hw_params(handle, params);
        if(rc<0)
        {
        perror("\nsnd_pcm_hw_params: ");
        exit(1);
        }

        rc=snd_pcm_hw_params_get_period_size(params, &frames, &dir); /*獲取周期
長度*/
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_get_period_size:");
                exit(1);
        }

        size = frames * datablock; /*4 代表數據快長度*/

        buffer =(char*)malloc(size);
    fseek(fp,58,SEEK_SET); //定位歌曲到數據區

    while (1)
        {
                memset(buffer,0,sizeof(buffer));
                ret = fread(buffer, 1, size, fp);
                if(ret == 0)
                {
                        printf("歌曲寫入結束\n");
                        break;
                }
                 else if (ret != size)
                {
                 }
                // 寫音頻數據到PCM設備 
        while(ret = snd_pcm_writei(handle, buffer, frames)<0)
           {
                 usleep(2000); 
                 if (ret == -EPIPE)
                {
                  /* EPIPE means underrun */
                  fprintf(stderr, "underrun occurred\n");
                  //完成硬件參數設置，使設備准備好 
                  snd_pcm_prepare(handle);
                 }
                 else if (ret < 0)
                 {
                          fprintf(stderr,
                      "error from writei: %s\n",
                      snd_strerror(ret));
                 }
            }

    }

        snd_pcm_drain(handle);
        snd_pcm_close(handle);
        free(buffer);
        return 0;
}

 

#include<stdio.h>
#include<stdlib.h>
#include <string.h>
#include <alsa/asoundlib.h>




struct WAV_HEADER
{
    char rld[4]; //riff 標志符號
    int rLen;
    char wld[4]; //格式類型（wave）
    char fld[4]; //"fmt"

    int fLen; //sizeof(wave format matex)
    
    short wFormatTag; //編碼格式
    short wChannels; //聲道數
    int nSamplesPersec ; //采樣頻率
    int nAvgBitsPerSample;//WAVE文件采樣大小
    short wBlockAlign; //塊對齊
    short wBitsPerSample; //WAVE文件采樣大小
    
    char dld[4]; //”data“
    int wSampleLength; //音頻數據的大小

} wav_header;

int set_pcm_play(FILE *fp);

int main(int argc,char *argv[])
{

    if(argc!=2)
    {
        printf("Usage:wav-player+wav file name\n");
        exit(1);
    }

    int nread;
    FILE *fp;
    fp=fopen(argv[1],"rb");
    if(fp==NULL)
    {
        perror("open file failed:\n");
        exit(1);
    }
    
    nread=fread(&wav_header,1,sizeof(wav_header),fp);
    printf("nread=%d\n",nread);
    
    //printf("RIFF 標志%s\n",wav_header.rld);
    printf("文件大小rLen：%d\n",wav_header.rLen);
    //printf("wld=%s\n",wav_header.wld);
    //printf("fld=%s\n",wav_header.fld);
    
   // printf("fLen=%d\n",wav_header.fLen);
    
    //printf("wFormatTag=%d\n",wav_header.wFormatTag);
    printf("聲道數：%d\n",wav_header.wChannels);
    printf("采樣頻率：%d\n",wav_header.nSamplesPersec);
    //printf("nAvgBitsPerSample=%d\n",wav_header.nAvgBitsPerSample);
    //printf("wBlockAlign=%d\n",wav_header.wBlockAlign);
    printf("采樣的位數：%d\n",wav_header.wBitsPerSample);
    
   // printf("data=%s\n",wav_header.dld);
    printf("wSampleLength=%d\n",wav_header.wSampleLength);
    
    
    
    
    
    set_pcm_play(fp);
    return 0;
}

int set_pcm_play(FILE *fp)
{
        int rc;
        int ret;
        int size;
        snd_pcm_t* handle; //PCI設備句柄
        snd_pcm_hw_params_t* params;//硬件信息和PCM流配置
        unsigned int val;
        int dir=0;
        snd_pcm_uframes_t frames;
        char *buffer;
        int channels=wav_header.wChannels;
        int frequency=wav_header.nSamplesPersec;
        int bit=wav_header.wBitsPerSample;
        int datablock=wav_header.wBlockAlign;
        unsigned char ch[100]; //用來存儲wav文件的頭信息
    
    
        
        rc=snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0);
        if(rc<0)
        {
                perror("\nopen PCM device failed:");
                exit(1);
        }


        snd_pcm_hw_params_alloca(&params); //分配params結構體
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_alloca:");
                exit(1);
        }
         rc=snd_pcm_hw_params_any(handle, params);//初始化params
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_any:");
                exit(1);
        }
        rc=snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED); //初始化訪問權限
        if(rc<0)
        {
                perror("\nsed_pcm_hw_set_access:");
                exit(1);

        }

        //采樣位數
        switch(bit/8)
        {
        case 1:snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_U8);
                break ;
        case 2:snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);
                break ;
        case 3:snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S24_LE);
                break ;

        }
        rc=snd_pcm_hw_params_set_channels(handle, params, channels); //設置聲道,1表示單聲>道，2表示立體聲
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_set_channels:");
                exit(1);
        }
        val = frequency;
        rc=snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir); //設置>頻率
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_set_rate_near:");
                exit(1);
        }

        rc = snd_pcm_hw_params(handle, params);
        if(rc<0)
        {
        perror("\nsnd_pcm_hw_params: ");
        exit(1);
        }

        rc=snd_pcm_hw_params_get_period_size(params, &frames, &dir); /*獲取周期
長度*/
        if(rc<0)
        {
                perror("\nsnd_pcm_hw_params_get_period_size:");
                exit(1);
        }

        size = frames * datablock; /*4 代表數據快長度*/

        buffer =(char*)malloc(size);
    fseek(fp,58,SEEK_SET); //定位歌曲到數據區

    while (1)
        {
                memset(buffer,0,sizeof(buffer));
                ret = fread(buffer, 1, size, fp);
                if(ret == 0)
                {
                        printf("歌曲寫入結束\n");
                        break;
                }
                 else if (ret != size)
                {
                 }
                // 寫音頻數據到PCM設備
        while(ret = snd_pcm_writei(handle, buffer, frames)<0)
           {
                 usleep(2000);
                 if (ret == -EPIPE)
                {
                  /* EPIPE means underrun */
                  fprintf(stderr, "underrun occurred\n");
                  //完成硬件參數設置，使設備准備好
                  snd_pcm_prepare(handle);
                 }
                 else if (ret < 0)
                 {
                          fprintf(stderr,
                      "error from writei: %s\n",
                      snd_strerror(ret));
                 }
            }

    }

        snd_pcm_drain(handle);
        snd_pcm_close(handle);
        free(buffer);
        return 0;
}


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