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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。
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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。
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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; }