(原)hisi3531立体声pcm实现播放方式

最近在使用hisi3531做一个项目，需要实现本地文件播放的功能，在做音频播放功能的时候，调试了很久才算基本调通。

因为hisi3531的硬解码音频功能不支持对mp3和aac等常见类型的解码，所以这里需要实现音频播放，当然就需要借助强大的ffpmeg来实现软件解码音频，我当初的实现方案是:ffmpeg-->dec--->pcm--->adec(LPCM)---ao;这套思路是实现的。目前经过调试，成功了，方案也同样是这套，只不过这中间的曲折，花了不少时间，目前我打算记录这中间的调试过程，给需要帮组的人。

通过ffmpeg实现解码，解码后的pcm文件我在中间进行了一个转换，转换为s16的格式，因为考虑到其他的格式可能3531不支持，所以这里我在做的时候，都统一使用s16的音频采样格式。

拿到s16的格式PCM以后，我的做法是设置3531的ao属性和adec属性，然后创建,打开,绑定adec和ao，接着按照sample的代码，将pcm发送给adec实现解码播放.结果播放出来的效果为：声音被拉长，声道的左右声道音量大小不一样这种情况。

开始我以为是解码有问题，将解码后的pcm写成文件，我拷贝到pc上进行试播放，pc上播放完全是正常的，这就奇怪了，到底哪里出问题了呢？

于是我拿hisi官方的sample来做测试，播放刚刚那个pcm文件，结果效果还是跟刚刚一样。

这时候，我就开始问度娘，找论坛看之前有人遇到跟我一样的情况不，在论坛里面找到了:http://www.ebaina.com/bbs/forum.php?mod=viewthread&tid=7100&highlight=pcm

播放声音被拉长，难道是采样率的问题？我回过头再去看看，结果我设置模式没有错啊？

/* init stAio. all of cases will use it */
stAioAttr.enSamplerate = AUDIO_SAMPLE_RATE_44100;//AUDIO_SAMPLE_RATE_8000;
stAioAttr.enBitwidth = AUDIO_BIT_WIDTH_16;
stAioAttr.enWorkmode = AIO_MODE_I2S_SLAVE;/*从模式*/
/*音频声道模式*/
stAioAttr.enSoundmode = AUDIO_SOUND_MODE_STEREO;;
stAioAttr.u32EXFlag = 0;//1;
stAioAttr.u32FrmNum = 30;/*缓存帧个数*/
stAioAttr.u32PtNumPerFrm = SAMPLE_AUDIO_PTNUMPERFRM;/*每帧的采样点个数*/
stAioAttr.u32ChnCnt = 2;/*音频通道数*/
stAioAttr.u32ClkSel = 1;

有人说我对aic31这个codec配置有问题，采样率不对，于是我结合驱动，把SAMPLE_Tlv320_CfgAudio函数又确认了一次，把aic31芯片看了下，发现采样率设置没问题。

那到底哪出了问题？

在没有办法找出原因的情况下，我将ffmpeg解码后的PCM数据设置为单声道，然后我再进行播放，这时候声音播放效果正常了。什么原因？从这一点也确实证明了，我设置采样率是没有问题的。

然后接着查原因，既然我从ai----->ao可以实现立体声，那么应该这个也是可以的，于是我再换回立体声，查看系统调试打印信息进行对比：

在ai----->ao模式下stero的调试信息如下：

然后我试一下播放stero的file，adec---->ao:

通过对比发现ao通道这时候有一个通道是没有数据的。

难怪会不正常。

==========================

这时候我就跟网上一个朋友沟通，然后我截这两个图给他，他问我，你用stereo模式？用mono啊，都是单声道，2个。

我奇怪，我说难道这个不支持stereo?我看官方文档没写啊？

他说2个单声道不就是双声道了。

我然后又说：难道你要我两个mono来实现，分别写？

他说：对

我说：好吧，那我来试试。

================

通过设置mono的方式，我打开了ao设备4的两个通道(0,1)，然后将两个通道bind到adec的同一个通道上(0)，然后开始写数据.

结果奇迹般的实现了，声音也没出现一大一小，节拍不对的情况。OK，就这么搞定了，哎，想想都是泪啊，hisi这坑。

下面贴上我的调试代码：

HI_S32 ADEC_Tlv320_CfgAudio(AIO_MODE_E enWorkmode,AUDIO_SAMPLE_RATE_E enSample)
{
    HI_S32 s32Samplerate;
    HI_S32 vol = 0x100;
    Audio_Ctrl audio_ctrl;
    int s_fdTlv = -1;
    HI_BOOL bPCMmode = HI_FALSE;
    HI_BOOL bMaster = HI_TRUE;      /* 这里的主模式是对于Tlv320aic31来说的 */
    HI_BOOL bPCMStd = HI_FALSE;
     
    /* aic31外接着一个12.288M的晶振，对于44.1k系列的采样率与48k系列的采样率，
        需要给aic31配置不同的P、R、J、D值，所以这里设置一标志来记录 */
    HI_BOOL b44100HzSeries = HI_FALSE;         
         
    if (AUDIO_SAMPLE_RATE_8000 == enSample)
    {
        s32Samplerate = AC31_SET_8K_SAMPLERATE;
    }
    else if (AUDIO_SAMPLE_RATE_12000 == enSample)
    {
        s32Samplerate = AC31_SET_12K_SAMPLERATE;
    }
    else if (AUDIO_SAMPLE_RATE_11025 == enSample)
    {
        b44100HzSeries = HI_TRUE;
        s32Samplerate = AC31_SET_11_025K_SAMPLERATE;
    }
    else if (AUDIO_SAMPLE_RATE_16000 == enSample)
    {
        s32Samplerate = AC31_SET_16K_SAMPLERATE;
    }
    else if (AUDIO_SAMPLE_RATE_22050 == enSample)
    {
        b44100HzSeries = HI_TRUE;
        s32Samplerate = AC31_SET_22_05K_SAMPLERATE;
    }
    else if (AUDIO_SAMPLE_RATE_24000 == enSample)
    {
        s32Samplerate = AC31_SET_24K_SAMPLERATE;
    }
    else if (AUDIO_SAMPLE_RATE_32000 == enSample)
    {
        s32Samplerate = AC31_SET_32K_SAMPLERATE;
    }
    else if (AUDIO_SAMPLE_RATE_44100 == enSample)
    {
        b44100HzSeries = HI_TRUE;
        s32Samplerate = AC31_SET_44_1K_SAMPLERATE;
    }
    else if (AUDIO_SAMPLE_RATE_48000 == enSample)
    {
        s32Samplerate = AC31_SET_48K_SAMPLERATE;
    }
    else 
    {
        printf("SAMPLE_Tlv320_CfgAudio(), not support enSample:%d
",enSample);
        return -1;
    }
     
    if(AIO_MODE_I2S_MASTER == enWorkmode) 
    {
        bPCMmode = HI_FALSE;
        bMaster = HI_FALSE;
    }
    else if(AIO_MODE_I2S_SLAVE == enWorkmode)
    {
        bPCMmode = HI_FALSE;
        bMaster = HI_TRUE;
    }
    else if((AIO_MODE_PCM_MASTER_NSTD == enWorkmode)||(AIO_MODE_PCM_MASTER_STD == enWorkmode))
    {
        bPCMmode = HI_TRUE;
        bMaster = HI_FALSE;
    }
    else if((AIO_MODE_PCM_SLAVE_NSTD == enWorkmode)||(AIO_MODE_PCM_SLAVE_STD == enWorkmode))
    {
        bPCMmode = HI_TRUE;
        bMaster = HI_TRUE;
    }
    else
    {
        printf("SAMPLE_Tlv320_CfgAudio(), not support workmode:%d

",enWorkmode);
    }
     
    s_fdTlv = open(TLV320_FILE,O_RDWR);
    if (s_fdTlv < 0)
    {
        printf("can't open tlv320,%s
", TLV320_FILE);
        return -1;   
    }     
     
    audio_ctrl.chip_num = 0;
    if (ioctl(s_fdTlv,SOFT_RESET,&audio_ctrl))
    {
        printf("[Func]:%s [Line]:%d [Info]:%s
", __FUNCTION__, __LINE__, "tlv320aic31 reset failed");
    }
    
    /* 设置主从模式 1为主模式*/ 
    audio_ctrl.ctrl_mode = bMaster;
    audio_ctrl.if_44100hz_series = b44100HzSeries;
    audio_ctrl.sample = s32Samplerate;
    ioctl(s_fdTlv,SET_CTRL_MODE,&audio_ctrl); 
         
    /* set transfer mode 0:I2S 1:PCM */
    audio_ctrl.trans_mode = bPCMmode;
    if (ioctl(s_fdTlv,SET_TRANSFER_MODE,&audio_ctrl))
    {
        printf("set tlv320aic31 trans_mode err
");
        close(s_fdTlv);
        return -1;
    }
             
    /*set sample of DAC and ADC */
    if (ioctl(s_fdTlv,SET_DAC_SAMPLE,&audio_ctrl))
    {
        printf("ioctl err1
");
        close(s_fdTlv);
        return -1;
    }
         
    if (ioctl(s_fdTlv,SET_ADC_SAMPLE,&audio_ctrl))
    {
        printf("ioctl err2
");
        close(s_fdTlv);
        return -1;
    }     
         
    /*set volume control of left and right DAC */
    audio_ctrl.if_mute_route = 0;
    audio_ctrl.input_level = 0;
    ioctl(s_fdTlv,LEFT_DAC_VOL_CTRL,&audio_ctrl);
    ioctl(s_fdTlv,RIGHT_DAC_VOL_CTRL,&audio_ctrl);
         
    /*Right/Left DAC Datapath Control */
    /*
    * 0:Left/Right DAC datapath plays off
    * 1:Left/Right DAC datapath plays left/right channel input data
    * 2:Left/Right DAC datapath plays right/left channel input data
    * 3:Left/Right DAC datapath plays mono mix of left/right channel input data
    */
    audio_ctrl.if_powerup = 1;/*Left/Right DAC datapath plays left/right channel input data*/
    //audio_ctrl.if_powerup = 3;/*lhp:test*/
    ioctl(s_fdTlv,LEFT_DAC_POWER_SETUP,&audio_ctrl);
    //audio_ctrl.if_powerup = 2;/*lhp:test*/
    ioctl(s_fdTlv,RIGHT_DAC_POWER_SETUP,&audio_ctrl);
     
    /* 设置PCM标准模式和非标准模式 */
    if ((AIO_MODE_PCM_MASTER_STD == enWorkmode)||(AIO_MODE_PCM_SLAVE_STD == enWorkmode))
    {
        bPCMStd = HI_TRUE;
        audio_ctrl.data_offset = bPCMStd;
        ioctl(s_fdTlv,SET_SERIAL_DATA_OFFSET,&audio_ctrl);
    }
    else if ((AIO_MODE_PCM_MASTER_NSTD == enWorkmode)||(AIO_MODE_PCM_SLAVE_NSTD == enWorkmode))
    {
        bPCMStd = HI_FALSE;
        audio_ctrl.data_offset = bPCMStd;
        ioctl(s_fdTlv,SET_SERIAL_DATA_OFFSET,&audio_ctrl);
    }
    else
    {;}
         
    /* 数据位宽 (0:16bit 1:20bit 2:24bit 3:32bit) */
    audio_ctrl.data_length = 0;
    ioctl(s_fdTlv,SET_DATA_LENGTH,&audio_ctrl);
       
    /*DACL1 TO LEFT_LOP/RIGHT_LOP VOLUME CONTROL 82 92*/
    audio_ctrl.if_mute_route = 1;/* route*/
    audio_ctrl.input_level = vol; /*level control*/
    ioctl(s_fdTlv,DACL1_2_LEFT_LOP_VOL_CTRL,&audio_ctrl);
    ioctl(s_fdTlv,DACR1_2_RIGHT_LOP_VOL_CTRL,&audio_ctrl);
     
    /* LEFT_LOP/RIGHT_LOP OUTPUT LEVEL CONTROL 86 93*/
    audio_ctrl.if_mute_route = 1;
    audio_ctrl.if_powerup = 1;
    audio_ctrl.input_level = 0;
    ioctl(s_fdTlv,LEFT_LOP_OUTPUT_LEVEL_CTRL,&audio_ctrl);
    ioctl(s_fdTlv,RIGHT_LOP_OUTPUT_LEVEL_CTRL,&audio_ctrl);
     
    /*配置AD*/
    /* LEFT/RIGHT ADC PGA GAIN CONTROL 15 16*/    
    audio_ctrl.if_mute_route =0;     
    audio_ctrl.input_level = 0;    
    ioctl(s_fdTlv,LEFT_ADC_PGA_CTRL,&audio_ctrl);      
    ioctl(s_fdTlv,RIGHT_ADC_PGA_CTRL,&audio_ctrl); 
     
    /*INT2L TO LEFT/RIGTH ADCCONTROL 17 18*/     
    audio_ctrl.input_level = 0;    
    ioctl(s_fdTlv,IN2LR_2_LEFT_ADC_CTRL,&audio_ctrl);      
    ioctl(s_fdTlv,IN2LR_2_RIGTH_ADC_CTRL,&audio_ctrl); 
     
    /*IN1L_2_LEFT/RIGTH_ADC_CTRL 19 22*/     
    /*audio_ctrl.input_level = 0xf;    
    audio_ctrl.if_powerup = 1;
    printf("audio_ctrl.input_level=0x%x,audio_ctrl.if_powerup=0x%x
",audio_ctrl.input_level,audio_ctrl.if_powerup);
    if (ioctl(s_fdTlv,IN1L_2_LEFT_ADC_CTRL,&audio_ctrl)==0)
        perror("ioctl err
");    
    getchar();
    printf("audio_ctrl.input_level=0x%x,audio_ctrl.if_powerup=0x%x
",audio_ctrl.input_level,audio_ctrl.if_powerup);
    ioctl(s_fdTlv,IN1R_2_RIGHT_ADC_CTRL,&audio_ctrl); 
    getchar();
    printf("set 19 22
");*/
     
    close(s_fdTlv);
    printf("Set aic31 ok: bMaster = %d, enWorkmode = %d, enSamplerate = %d
",
            bMaster, enWorkmode, enSample);
    return 0;
}

HI_S32 ADEC_AUDIO_AdecAo(AIO_ATTR_S *pstAioAttr)
{
    HI_S32      s32Ret;
    AUDIO_DEV   AoDev = SAMPLE_AUDIO_AO_DEV;
    AO_CHN      AoChn = 0;
    ADEC_CHN    AdChn = 0;
    FILE        *pfd = NULL;

    if (NULL == pstAioAttr)
    {
        printf("[Func]:%s [Line]:%d [Info]:%s
", __FUNCTION__, __LINE__, "NULL pointer");
        return HI_FAILURE;
    }
#if 0
    s32Ret = SAMPLE_COMM_AUDIO_CfgAcodec(pstAioAttr, gs_bMicIn);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
#else
/*使用新的测试函数:for test by lhp*/
    s32Ret=ADEC_Tlv320_CfgAudio(pstAioAttr->enWorkmode, pstAioAttr->enSamplerate);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
#endif
    
   #if 0
   //调整一下顺序
   s32Ret = SAMPLE_COMM_AUDIO_StartAdec(AdChn, gs_enPayloadType);
   if (s32Ret != HI_SUCCESS)
   {
       SAMPLE_DBG(s32Ret);
       return HI_FAILURE;
   }
   #endif

    s32Ret = SAMPLE_COMM_AUDIO_StartAo(AoDev, AoChn, pstAioAttr, gs_pstAoReSmpAttr);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
    /*通过mono的方式实现stero*/
    s32Ret = HI_MPI_AO_EnableChn(AoDev, AoChn+1);
    if(HI_SUCCESS != s32Ret)
    {
        printf("%s: HI_MPI_AO_EnableChn(%d) failed with %#x!
", __FUNCTION__,
               AoChn, s32Ret);
        return HI_FAILURE;
    }
#if 1
    //调整一下顺序
    s32Ret = SAMPLE_COMM_AUDIO_StartAdec(AdChn, gs_enPayloadType);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
#endif
    s32Ret = SAMPLE_COMM_AUDIO_AoBindAdec(AoDev, AoChn, AdChn);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
    //立体声绑定测试
    s32Ret = SAMPLE_COMM_AUDIO_AoBindAdec(AoDev, AoChn+1, AdChn);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
    

    pfd = SAMPLE_AUDIO_OpenAdecFile(AdChn, gs_enPayloadType);
    if (!pfd)
    {
        SAMPLE_DBG(HI_FAILURE);
        return HI_FAILURE;
    }
    s32Ret = SAMPLE_COMM_AUDIO_CreatTrdFileAdec(AdChn, pfd);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
    
    printf("bind adec:%d to ao(%d,%d,%d) ok 
", AdChn, AoDev, AoChn,AoChn+1);

    printf("
please press twice ENTER to exit this sample
");
    getchar();
    getchar();

    SAMPLE_COMM_AUDIO_DestoryTrdFileAdec(AdChn);
    SAMPLE_COMM_AUDIO_StopAo(AoDev, AoChn, gs_bAioReSample);
    SAMPLE_COMM_AUDIO_StopAdec(AdChn);
    
    if(SAMPLE_COMM_AUDIO_AoUnbindAdec(AoDev, AoChn, AdChn))
    {
        printf("unbind failed1.");
    }
    
    if(SAMPLE_COMM_AUDIO_AoUnbindAdec(AoDev, AoChn+1, AdChn))
    {
        printf("unbind failed2.");
    }
    
    return HI_SUCCESS;
}

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原文地址：https://www.cnblogs.com/lihaiping/p/5251854.html