请教如何播放双声道的PCM音频数据

Hi3518EV200。
我在打开输出设备后，打开并绑定了2个输出通道和解码通道，分别往2个解码通道发送数据，但是执行时只能听到通道0，也就是左声道的声音，通道2没声音且不断提示“[Func]:HI_MPI_AO_SendFrame [Line]:1854 [Info]:AO chn 1 is not enable”。
如果是打开输出设备后，只打开并绑定1个输出通道和解码通道，出来的声音很慢，听起来像是以单声道的速度在播放。
应该怎么做才能正确输出左右2个声道的声音呢？
[code]
int main()
{
    HI_S32 ret;

    VB_CONF_S vbConf;
    MPP_SYS_CONF_S mppSysConf;
    HI_S32 fdAcodec;
    ACODEC_FS_E i2sFs;

    AUDIO_DEV aoDev = 0;
    AO_CHN aoChnL = 0;
    AO_CHN aoChnR = 1;
    ADEC_CHN adecChnL = 0;
    ADEC_CHN adecChnR = 1;

    AIO_ATTR_S aoAttr;
    ADEC_ATTR_LPCM_S adecAttrLpcm;
    ADEC_CHN_ATTR_S adecChnAttr;
    MPP_CHN_S mppSrcChnL, mppDstChnL;
    MPP_CHN_S mppSrcChnR, mppDstChnR;
    AUDIO_STREAM_S streamL;
    AUDIO_STREAM_S streamR;

    FILE *fpL = NULL;
    FILE *fpR = NULL;
    char bufL[640] = {0};
    char bufR[640] = {0};
    HI_U32 size = 0;


    //初始化MPP系统
    HI_MPI_SYS_Exit();
    HI_MPI_VB_Exit();
    memset(&vbConf, 0, sizeof(VB_CONF_S));
    HI_MPI_VB_SetConf(&vbConf);
    HI_MPI_VB_Init();
    mppSysConf.u32AlignWidth = 64;
    HI_MPI_SYS_SetConf(&mppSysConf);
    HI_MPI_SYS_Init();

    //初始化AudioCodec
    fdAcodec = open(ACODEC_FILE, O_RDWR);
    ioctl(fdAcodec, ACODEC_SOFT_RESET_CTRL);
    i2sFs = ACODEC_FS_44100;
    ioctl(fdAcodec, ACODEC_SET_I2S1_FS, &i2sFs);
    close(fdAcodec);

    //打开输出设备
    aoAttr.enSamplerate   = AUDIO_SAMPLE_RATE_44100;
    aoAttr.enBitwidth     = AUDIO_BIT_WIDTH_16;
    aoAttr.enWorkmode     = AIO_MODE_I2S_MASTER;
    aoAttr.enSoundmode    = AUDIO_SOUND_MODE_STEREO;
    aoAttr.u32EXFlag      = 0;
    aoAttr.u32FrmNum      = 30;
    aoAttr.u32PtNumPerFrm = 320;
    aoAttr.u32ChnCnt      = 2;
    aoAttr.u32ClkSel      = 0;
    ret = HI_MPI_AO_SetPubAttr(aoDev, &aoAttr);
    if(ret != HI_SUCCESS)
    {
        printf("HI_MPI_AO_SetPubAttr error: 0x%x\n", ret);
    }
    ret = HI_MPI_AO_Enable(aoDev);
    if(ret != HI_SUCCESS)
    {
        printf("HI_MPI_AO_Enable error: 0x%x\n", ret);
    }

    //打开输出通道
    ret = HI_MPI_AO_EnableChn(aoDev, aoChnL);
    if(ret != HI_SUCCESS)
    {
        printf("HI_MPI_AO_EnableChn error: 0x%x\n", ret);
    }
    //HI_MPI_AO_EnableChn(aoDev, aoChnR);   //根据文档描述不用使能此通道

    //打开解码通道
    adecChnAttr.enType = PT_LPCM;
    adecChnAttr.u32BufSize = 20;
    adecChnAttr.enMode = ADEC_MODE_PACK;
    adecChnAttr.pValue = &adecAttrLpcm;
    HI_MPI_ADEC_CreateChn(adecChnL, &adecChnAttr);
    HI_MPI_ADEC_CreateChn(adecChnR, &adecChnAttr);

    //绑定输出通道和解码通道
    mppSrcChnL.enModId = HI_ID_ADEC;
    mppSrcChnL.s32DevId = 0;
    mppSrcChnL.s32ChnId = adecChnL;
    mppDstChnL.enModId = HI_ID_AO;
    mppDstChnL.s32DevId = aoDev;
    mppDstChnL.s32ChnId = aoChnL;
    HI_MPI_SYS_Bind(&mppSrcChnL, &mppDstChnL);
    mppSrcChnR.enModId = HI_ID_ADEC;
    mppSrcChnR.s32DevId = 0;
    mppSrcChnR.s32ChnId = adecChnR;
    mppDstChnR.enModId = HI_ID_AO;
    mppDstChnR.s32DevId = aoDev;
    mppDstChnR.s32ChnId = aoChnR;
    HI_MPI_SYS_Bind(&mppSrcChnR, &mppDstChnR);

    //设置音量
    HI_MPI_AO_SetVolume(aoDev, 6);

    //开始播放
#if(0)
    fpL = fopen("/tfcard/chan1.wav", "r+");
    fpR = fopen("/tfcard/chan1-1.wav", "r+");
    while(1)
    {
        size = fread(bufL, 1, sizeof(bufL), fpL);
        if(size == 0) break;
        streamL.pStream = (HI_U8 *)bufL;
        streamL.u32Len = size;
        HI_MPI_ADEC_SendStream(adecChnL, &streamL, HI_TRUE);

        size = fread(bufR, 1, sizeof(bufR), fpR);
        if(size == 0) break;
        streamR.pStream = (HI_U8 *)bufR;
        streamR.u32Len = size;
        HI_MPI_ADEC_SendStream(adecChnR, &streamR, HI_TRUE);
    }
    fclose(fpL);
    fclose(fpR);
#else
    fpL = fopen("/tfcard/chan2.wav", "r+");
    while(1)
    {
        size = fread(bufL, 1, sizeof(bufL), fpL);
        if(size == 0) break;
        streamL.pStream = (HI_U8 *)bufL;
        streamL.u32Len = size;
        HI_MPI_ADEC_SendStream(adecChnL, &streamL, HI_TRUE);
    }
    fclose(fpL);
#endif

    //关闭通道
    HI_MPI_SYS_UnBind(&mppSrcChnL, &mppDstChnL);
    HI_MPI_SYS_UnBind(&mppSrcChnR, &mppDstChnR);
    HI_MPI_AO_DisableChn(aoDev, aoChnL);
    HI_MPI_AO_DisableChn(aoDev, aoChnR);
    HI_MPI_AO_Disable(aoDev);
    HI_MPI_ADEC_DestroyChn(adecChnL);
    HI_MPI_ADEC_DestroyChn(adecChnR);

    //关闭MPP系统
    HI_MPI_SYS_Exit();
    HI_MPI_VB_Exit();

    return 0;
}
[/code]