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Hi,

From the log, I could see

permission denied for "/etc/dbus.conf"

Kindly give proper permission to this file

chmod 777 /etc/dbus.conf ( one can add this line to init.rc file to make the change permanent)

BR,

Satish

Hi，Satish

Thank you very much for your reply

Now I can use the SoundRecorder application for recording sound.  But there is a new problem, When I play back the recorded files, sound is very small.

# alsa_amixer contents
numid=3,iface=MIXER,name='Line Input Switch'
  ; type=BOOLEAN,access=rw------,values=2
  : values=on,on
numid=4,iface=MIXER,name='Line Input Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=23,23
  | dBscale-min=-17.25dB,step=0.75dB,mute=0
numid=6,iface=MIXER,name='Mic Booster Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=5,iface=MIXER,name='Mic Input Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=12,iface=MIXER,name='Capture Source'
  ; type=ENUMERATED,access=rw------,values=1,items=2
  ; Item #0 'Line'
  ; Item #1 'Mic'
  : values=1
numid=8,iface=MIXER,name='Playback De-emphasis'
  ; type=ENUMERATED,access=rw------,values=1,items=4
  ; Item #0 'None'
  ; Item #1 '32Khz'
  ; Item #2 '44.1Khz'
  ; Item #3 '48Khz'
  : values=2
numid=2,iface=MIXER,name='Digital Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=1,iface=MIXER,name='Digital Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=127,step=0
  : values=0,111
  | dBscale-min=-121.00dB,step=1.00dB,mute=0
numid=9,iface=MIXER,name='Output Mixer Line Bypass Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=10,iface=MIXER,name='Output Mixer Mic Sidetone Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=off
numid=11,iface=MIXER,name='Output Mixer Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=7,iface=MIXER,name='Sidetone Volume'
  ; type=INTEGER,access=rw---R--,values=1,min=0,max=4,step=0
  : values=3
  | dBscale-min=-18.00dB,step=3.00dB,mute=0
#

Hi,

Kindly look for alsa-mixer settings, which can increase recording amplitude. I do not have much idea on that.

Also, see if media volumme is proper. Play some media from music player and check the volumme.

BR,

satish

Hi,

    I think my problem is due to the sampling frequency and the number of channels is not set correctly.

I try to modify the alsa_module.cpp, set the sampling frequency of 44100Hz, channel number is 2, but it failed.
Log is 0511.log.txt

I want to know how to modify them in the Android file system ?

Have you checked the porting guide?

http://processors.wiki.ti.com/index.php/TI-Android-GingerBread-2.3.4-DevKit-2.1_PortingGuides#Android_Audio_HAL_Configuration

Hi,Vishveshwar

   Thank you very much for your reply.

   I have checked that porting guide.

   1.I have tested it using ALSA utilities. It worked well.
   # ln -s /system/bin/alsa_aplay /system/bin/alsa_arecord
   # alsa_amixer -c 0 sset 'Mic Input',0 100%,100% unmute cap
     Simple mixer control 'Mic Input',0
     Capabilities: pswitch pswitch-joined
     Playback channels: Mono
     Mono: Playback [on]
  #
  # alsa_arecord -f cd | alsa_aplay
    Recording WAVE 'stdin' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
    Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
   ^CAborted by signal Interrupt...
   Aborted by signal Interrupt...
  #

   2.Alsa_module.cpp file is modified as follows:
     447 void setDefaultControls(uint32_t devices, int mode)
448 {
449 LOGV("%s", __FUNCTION__);
450     ALSAControl control("hw:00");
451
452     /* check whether the devices is input or not */
453     /* for output devices */
454     if (devices & 0x0000FFFF){
455         if (devices & AudioSystem::DEVICE_OUT_SPEAKER) {
456             //control.set("HeadsetR Mixer AudioR1", 1); // on
457             //control.set("HeadsetL Mixer AudioL1", 1); // on
458             //control.set("Headset Playback Volume", 1); //Headset Volume
459             control.set("Output Mixer Playback Switch", 1); // on
460             control.set("Digital Playback Switch", 1); // on
461             control.set("Digital Playback Volume", 127); // Volume
462             LOGE("*******output mixer playback switcaaaaabbbbbb*******");
463         } else {
464             //control.set("HeadsetR Mixer AudioR1", (unsigned int)0); // off
465             //control.set("HeadsetL Mixer AudioL1", (unsigned int)0); // off
466             control.set("Digital Playback Switch", (unsigned int)0); // off
467             control.set("Output Mixer Playback Switch", (unsigned int)0); // off
468
469         }
470     }
471
472     /* for input devices */
473     if (devices >> 16) {
474         if (devices & AudioSystem::DEVICE_IN_BUILTIN_MIC) {
475         //change wu
476         //control.set("Analog Left AUXL Capture Switch", 1); //on
477         //control.set("Analog Right AUXR Capture Switch", 1); //on
478         //control.set("Analog Capture Volume", (unsigned int)0); //Capture volume '0' to capture less noice
479         control.set("Mic Input Switch", 1); //on
480         control.set("Mic Booster Switch", 1); //on
481         LOGE("*******output mixer playback switcccccccddddddddd*********");
482         //change wu end
483         } else {
484         //control.set("Analog Left AUXL Capture Switch", (unsigned int)0); //off
485         //control.set("Analog Right AUXR Capture Switch", (unsigned int)0); //off
486         control.set("Mic Booster Switch", (unsigned int)0); //on
487         control.set("Mic Input Switch", (unsigned int)0); //off
488         }
489     }
490 }
      In this case I can record, but the sound is very small, and there is noise.
      In addition, Sometimes mclk = 12000000, sample_rate_adc = 8000, sample_rate_dac = 44100
      When this happens,Recording time for 10s ,Play time for 30s or longer,and there is no sound.I don't know why this happens.


     3.Now, I want to put the sampling frequency to 44100Hz.I modify the following files:
      1)TI_Android_GingerBread_2_3_4Sources/device/ti/am3517evm/BoardConfig.mk
        11 #add
        12 ALSA_DEFAULT_SAMPLE_RATE := 44100
      2)TI_Android_GingerBread_2_3_4Sources/frameworks/base/include/media/AudioRecord.h
        41 //change
        42     //static const int DEFAULT_SAMPLE_RATE = 8000;
        43     static const int DEFAULT_SAMPLE_RATE = 44100;
     After modification, phenomenon is still the same,I don't known how to put the sampling frequency to 44100Hz.

AFAIK the stock AOSP code (from which TI Android DevKit is derived) supports only 8kHz sampling rate for recording. You may need some changes in frameworks to support 44.1kHz sampling rate for mic input.

Suggest you to look at omapzoom Android for this.

So in the Android-GingerBread-2.3.4-Devkit-2.1 which is the latest version for AM3517, the sampling rate is 8kHz? Could you give us some guideline for framework changing for adding 44.1kHz support, such as which file we should modify, or provide the git path for omapzoom Android .

The omapzoom android sources are available at: http://git.omapzoom.org/

You should probably look at the p-gingerbread branches in frameworks/base, hardware/ti/omap3 etc

If you need any further help on this you can refer their wiki pages at: http://www.omappedia.com/wiki/OMAP_Android_Main

Hi Vishveshwar,

Thanks a lot for your great help!

Thanks for all your help.

Now I have another urgent task. Later I will debug it refer to the links you provided, and explain the result.