版權聲明:本文為博主原創文章,未經博主允許不得轉載(http://www.cnblogs.com/lihaiping/p/5251854.html)
最近在使用hisi3531做一個項目,需要實現本地文件播放的功能,在做音頻播放功能的時候,調試了很久才算基本調通。
因為hisi3531的硬解碼音頻功能不支持對mp3和aac等常見類型的解碼,所以這里需要實現音頻播放,當然就需要借助強大的ffpmeg來實現軟件解碼音頻,我當初的實現方案是:ffmpeg-->dec--->pcm--->adec(LPCM)---ao;這套思路是實現的。目前經過調試,成功了,方案也同樣是這套,只不過這中間的曲折,花了不少時間,目前我打算記錄這中間的調試過程,給需要幫組的人。
通過ffmpeg實現解碼,解碼后的pcm文件我在中間進行了一個轉換,轉換為s16的格式,因為考慮到其他的格式可能3531不支持,所以這里我在做的時候,都統一使用s16的音頻采樣格式。
拿到s16的格式PCM以后,我的做法是設置3531的ao屬性和adec屬性,然后創建,打開,綁定adec和ao,接着按照sample的代碼,將pcm發送給adec實現解碼播放.結果播放出來的效果為:聲音被拉長,聲道的左右聲道音量大小不一樣這種情況。
開始我以為是解碼有問題,將解碼后的pcm寫成文件,我拷貝到pc上進行試播放,pc上播放完全是正常的,這就奇怪了,到底哪里出問題了呢?
於是我拿hisi官方的sample來做測試,播放剛剛那個pcm文件,結果效果還是跟剛剛一樣。
這時候,我就開始問度娘,找論壇看之前有人遇到跟我一樣的情況不,在論壇里面找到了:http://www.ebaina.com/bbs/forum.php?mod=viewthread&tid=7100&highlight=pcm
播放聲音被拉長,難道是采樣率的問題?我回過頭再去看看,結果我設置模式沒有錯啊?
/* 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;/*從模式*/ /*音頻聲道模式*/ stAioAttr.enSoundmode = AUDIO_SOUND_MODE_STEREO;; stAioAttr.u32EXFlag = 0;//1; stAioAttr.u32FrmNum = 30;/*緩存幀個數*/ stAioAttr.u32PtNumPerFrm = SAMPLE_AUDIO_PTNUMPERFRM;/*每幀的采樣點個數*/ stAioAttr.u32ChnCnt = 2;/*音頻通道數*/ stAioAttr.u32ClkSel = 1;
有人說我對aic31這個codec配置有問題,采樣率不對,於是我結合驅動,把SAMPLE_Tlv320_CfgAudio函數又確認了一次,把aic31芯片看了下,發現采樣率設置沒問題。
那到底哪出了問題?
在沒有辦法找出原因的情況下,我將ffmpeg解碼后的PCM數據設置為單聲道,然后我再進行播放,這時候聲音播放效果正常了。什么原因?從這一點也確實證明了,我設置采樣率是沒有問題的。
然后接着查原因,既然我從ai----->ao可以實現立體聲,那么應該這個也是可以的,於是我再換回立體聲,查看系統調試打印信息進行對比:
在ai----->ao模式下stero的調試信息如下:
然后我試一下播放stero的file,adec---->ao:
通過對比發現ao通道這時候有一個通道是沒有數據的。
難怪會不正常。
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這時候我就跟網上一個朋友溝通,然后我截這兩個圖給他,他問我,你用stereo模式?用mono啊,都是單聲道,2個。
我奇怪,我說難道這個不支持stereo?我看官方文檔沒寫啊?
他說2個單聲道不就是雙聲道了。
我然后又說:難道你要我兩個mono來實現,分別寫?
他說:對
我說:好吧,那我來試試。
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通過設置mono的方式,我打開了ao設備4的兩個通道(0,1),然后將兩個通道bind到adec的同一個通道上(0),然后開始寫數據.
結果奇跡般的實現了,聲音也沒出現一大一小,節拍不對的情況。OK,就這么搞定了,哎,想想都是淚啊,hisi這坑。
下面貼上我的調試代碼:
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; /* 這里的主模式是對於Tlv320aic31來說的 */ HI_BOOL bPCMStd = HI_FALSE; /* aic31外接着一個12.288M的晶振,對於44.1k系列的采樣率與48k系列的采樣率, 需要給aic31配置不同的P、R、J、D值,所以這里設置一標志來記錄 */ 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\n",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\n\n",enWorkmode); } s_fdTlv = open(TLV320_FILE,O_RDWR); if (s_fdTlv < 0) { printf("can't open tlv320,%s\n", TLV320_FILE); return -1; } audio_ctrl.chip_num = 0; if (ioctl(s_fdTlv,SOFT_RESET,&audio_ctrl)) { printf("[Func]:%s [Line]:%d [Info]:%s\n", __FUNCTION__, __LINE__, "tlv320aic31 reset failed"); } /* 設置主從模式 1為主模式*/ 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\n"); close(s_fdTlv); return -1; } /*set sample of DAC and ADC */ if (ioctl(s_fdTlv,SET_DAC_SAMPLE,&audio_ctrl)) { printf("ioctl err1\n"); close(s_fdTlv); return -1; } if (ioctl(s_fdTlv,SET_ADC_SAMPLE,&audio_ctrl)) { printf("ioctl err2\n"); 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); /* 設置PCM標准模式和非標准模式 */ 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 {;} /* 數據位寬 (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\n",audio_ctrl.input_level,audio_ctrl.if_powerup); if (ioctl(s_fdTlv,IN1L_2_LEFT_ADC_CTRL,&audio_ctrl)==0) perror("ioctl err\n"); getchar(); printf("audio_ctrl.input_level=0x%x,audio_ctrl.if_powerup=0x%x\n",audio_ctrl.input_level,audio_ctrl.if_powerup); ioctl(s_fdTlv,IN1R_2_RIGHT_ADC_CTRL,&audio_ctrl); getchar(); printf("set 19 22\n");*/ close(s_fdTlv); printf("Set aic31 ok: bMaster = %d, enWorkmode = %d, enSamplerate = %d\n", 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\n", __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 /*使用新的測試函數: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 //調整一下順序 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; } /*通過mono的方式實現stero*/ s32Ret = HI_MPI_AO_EnableChn(AoDev, AoChn+1); if(HI_SUCCESS != s32Ret) { printf("%s: HI_MPI_AO_EnableChn(%d) failed with %#x!\n", __FUNCTION__,\ AoChn, s32Ret); return HI_FAILURE; } #if 1 //調整一下順序 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; } //立體聲綁定測試 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 \n", AdChn, AoDev, AoChn,AoChn+1); printf("\nplease press twice ENTER to exit this sample\n"); 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; }