Hi3518ev200 音频库demo问题:

demo：Sample_audio.c

起初是一大堆奇奇怪怪的问题，多数原因是库加的不全。

demo跑起来起初，无论如何无声音从喇叭输出，根据测试确实录到了pcm数据，因为用pc软件播放正常，后从硬件处看到电路图，得知左声道输出回环接到了右声道输入上，左输入声道接了mic，而喇叭接在了右输出通道上，据此猜测在左输出声道上是应该有声音的，只是被回环到右输入声道上了，将喇叭接在左输出声道上测试了下，证明确实有声音了，再接回右声道又没输出了。但我们的要求是左右输出声道都有声音出来。

查看手册，看到这一段：

根据手册，在demo中Ao启动之后调用这个接口，将左右输出通道都输出左输入声道的声音 。代码段如下：

HI_S32 SAMPLE_AUDIO_AdecAo(HI_VOID)
{
    HI_S32      s32Ret;
    AUDIO_DEV   AoDev = SAMPLE_AUDIO_AO_DEV;
    AO_CHN      AoChn   = 0;
    AO_CHN      AoChn1 = 2;


    ADEC_CHN    AdChn = 0;
    HI_S32      s32AoChnCnt;
    FILE*        pfd = NULL;
    AIO_ATTR_S stAioAttr;

#ifdef HI_ACODEC_TYPE_TLV320AIC31
    stAioAttr.enSamplerate   = AUDIO_SAMPLE_RATE_8000;
    stAioAttr.enBitwidth     = AUDIO_BIT_WIDTH_16;
    stAioAttr.enWorkmode     = AIO_MODE_I2S_MASTER;
    stAioAttr.enSoundmode    = SOUNDMODE;
    stAioAttr.u32EXFlag      = 0;
    stAioAttr.u32FrmNum      = 30;
    stAioAttr.u32PtNumPerFrm = SAMPLE_AUDIO_PTNUMPERFRM;
    stAioAttr.u32ChnCnt      = CHNCNT;
    stAioAttr.u32ClkSel      = 1;
#else
    stAioAttr.enSamplerate   = AUDIO_SAMPLE_RATE_8000;
    stAioAttr.enBitwidth     = AUDIO_BIT_WIDTH_16;
    stAioAttr.enWorkmode     = AIO_MODE_I2S_MASTER;
    stAioAttr.enSoundmode    = SOUNDMODE;
    stAioAttr.u32EXFlag      = 0;
    stAioAttr.u32FrmNum      = 30;
    stAioAttr.u32PtNumPerFrm = SAMPLE_AUDIO_PTNUMPERFRM;
    stAioAttr.u32ChnCnt      = CHNCNT;
    stAioAttr.u32ClkSel      = 0;
#endif




    gs_bAioReSample = HI_FALSE;
    enInSampleRate  = AUDIO_SAMPLE_RATE_BUTT;
    enOutSampleRate = AUDIO_SAMPLE_RATE_BUTT;

    s32Ret = SAMPLE_COMM_AUDIO_CfgAcodec(&stAioAttr);
    if (HI_SUCCESS != s32Ret)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
    
    s32Ret = SAMPLE_COMM_AUDIO_StartAdec(AdChn, gs_enPayloadType);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }


s32AoChnCnt = stAioAttr.u32ChnCnt;
    s32Ret = SAMPLE_COMM_AUDIO_StartAo(AoDev, s32AoChnCnt, &stAioAttr, enInSampleRate, gs_bAioReSample, NULL, 0);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
//add by mrzhang
#if 1
AUDIO_TRACK_MODE_E enTrackMode = AUDIO_TRACK_BOTH_LEFT;


s32Ret = HI_MPI_AO_SetTrackMode(AoDev, enTrackMode);
if (HI_SUCCESS != s32Ret)
{
printf("Ao set track mode failure!\n");
return s32Ret;
}
printf("mrzhang audio out test!!!\n");
#endif 
    s32Ret = SAMPLE_COMM_AUDIO_AoBindAdec(AoDev, AoChn, 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;
    }
printf("open file successful*************\n");
    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) ok \n", AdChn, AoDev, AoChn);


    printf("\nplease press twice ENTER to exit this sample\n");
    getchar();
    getchar();


    s32Ret = SAMPLE_COMM_AUDIO_DestoryTrdFileAdec(AdChn);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
    
    s32Ret = SAMPLE_COMM_AUDIO_StopAdec(AdChn);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
    
    s32Ret = SAMPLE_COMM_AUDIO_StopAo(AoDev, s32AoChnCnt, gs_bAioReSample, HI_FALSE);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
    
    s32Ret = SAMPLE_COMM_AUDIO_AoUnbindAdec(AoDev, AoChn, AdChn);
    if (s32Ret != HI_SUCCESS)
    {
        SAMPLE_DBG(s32Ret);
        return HI_FAILURE;
    }
    
    return HI_SUCCESS;
}

这样分别将喇叭接在左右输出声道，测试证明左右都有声音输出了。