【转】用AudioRecord实现录音碰到的问题

Android AudioRecord errors

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	dmitriy325ci		更多选项 3月3日, 上午6时39分

发件人：dmitriy325ci

日期：Tue, 2 Mar 2010 14:39:05 -0800 (PST)

当地时间：2010年3月3日 (星期三) 上午6时39分

主题：Android AudioRecord errors

| | | | |

Hi Guys,
I am a newbie to android and was trying to get a simple recording
application up and running.  However I am facing errors and wondering
if some of you can point me in the right direction.

Stack Trace:
03-02 17:27:53.415: ERROR/AudioRecord(224): Could not get audio input
for record source 1
03-02 17:27:53.425: ERROR/AudioRecord-JNI(224): Error creating
AudioRecord instance: initialization check failed.
03-02 17:27:53.435: ERROR/AudioRecord-Java(224):
[ android.media.AudioRecord ] Error code -20 when initializing native
AudioRecord object.
03-02 17:27:53.487: ERROR/AudioRecord(224): Recording Failed
03-02 17:27:53.487: ERROR/AudioRecord(224):
java.lang.IllegalStateException: startRecording() called on an
uninitialized AudioRecord.
03-02 17:27:53.487: ERROR/AudioRecord(224):     at
android.media.AudioRecord.startRecording(AudioRecord.java:495)

Sample Code:
// Create a new AudioRecord object to record the audio.
int bufferSize =
AudioRecord.getMinBufferSize(AUDIO_SAMPLE_FREQUENCY_8000HZ,
                                                                    AudioFormat.CHANNEL_CONFIGURATION_MONO,
                                                                    AudioFormat.ENCODING_PCM_16BIT);
AudioRecord audioRecord = new
AudioRecord(MediaRecorder.AudioSource.MIC,
                                                                    AUDIO_SAMPLE_FREQUENCY_8000HZ,
                                                                    AudioFormat.CHANNEL_CONFIGURATION_MONO,

AudioFormat.ENCODING_PCM_16BIT,

bufferSize);
audioRecord.startRecording();

AndroidManifest.xml:
...
permission>
...

System Info:
Eclipse Galileo + SDK 2.1
IBM T60 running Windows XP

Thanks in advance,
Dmitriy

      

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	Matias Alberto de la Vega		更多选项 3月3日, 下午8时15分

发件人：Matias Alberto de la Vega

日期：Wed, 3 Mar 2010 04:15:02 -0800 (PST)

当地时间：2010年3月3日 (星期三) 下午8时15分

主题：Re: Android AudioRecord errors

| | | | |

Dimitry, if I'm not wrong, Android currently only supports AMR_NB for
encoding+decoding, PCM is only supported for decoding so far. And the
file encapsulating this type encoding should be 3GPP (audio/3gp is the
MIME type which you may need). You can find more information about
MediaRecorder in developer.android.com, take care!

On 2 mar, 19:39, dmitriy325ci wrote:

> Hi Guys,
> I am a newbie to android and was trying to get a simple recording
> application up and running.  However I am facing errors and wondering
> if some of you can point me in the right direction.

> Stack Trace:
> 03-02 17:27:53.415: ERROR/AudioRecord(224): Could not get audio input
> for record source 1
> 03-02 17:27:53.425: ERROR/AudioRecord-JNI(224): Error creating
> AudioRecord instance: initialization check failed.
> 03-02 17:27:53.435: ERROR/AudioRecord-Java(224):
> [ android.media.AudioRecord ] Error code -20 when initializing native
> AudioRecord object.
> 03-02 17:27:53.487: ERROR/AudioRecord(224): Recording Failed
> 03-02 17:27:53.487: ERROR/AudioRecord(224):
> java.lang.IllegalStateException: startRecording() called on an
> uninitialized AudioRecord.
> 03-02 17:27:53.487: ERROR/AudioRecord(224):     at
> android.media.AudioRecord.startRecording(AudioRecord.java:495)

> Sample Code:
> // Create a new AudioRecord object to record the audio.
> int bufferSize =
> AudioRecord.getMinBufferSize(AUDIO_SAMPLE_FREQUENCY_8000HZ,
>                                                                     AudioFormat.CHANNEL_CONFIGURATION_MONO,
>                                                                     AudioFormat.ENCODING_PCM_16BIT);
> AudioRecord audioRecord = new
> AudioRecord(MediaRecorder.AudioSource.MIC,
>                                                                     AUDIO_SAMPLE_FREQUENCY_8000HZ,
>                                                                     AudioFormat.CHANNEL_CONFIGURATION_MONO,

> AudioFormat.ENCODING_PCM_16BIT,

> bufferSize);
> audioRecord.startRecording();

> AndroidManifest.xml:
> ...
> > permission>
> ...

> System Info:
> Eclipse Galileo + SDK 2.1
> IBM T60 running Windows XP

> Thanks in advance,
> Dmitriy

      

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	dmitriy325ci		更多选项 3月4日, 上午12时18分

发件人：dmitriy325ci

日期：Wed, 3 Mar 2010 08:18:57 -0800 (PST)

当地时间：2010年3月4日 (星期四) 上午12时18分

主题：Re: Android AudioRecord errors

| | | | |

Hmmm - I was under impression that PCM was supported.  I was looking
to use AudioRecord instead of MediaRecorder as I can then have direct
access to the buffer.

Is this not a valid example/tutorial then?

http://emeadev.blogspot.com/2009/09/raw-audio-manipulation-in-android...

Dmitriy

      

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	dmitriy325ci		更多选项 3月4日, 上午4时25分

发件人：dmitriy325ci

日期：Wed, 3 Mar 2010 12:25:37 -0800 (PST)

当地时间：2010年3月4日 (星期四) 上午4时25分

主题：Re: Android AudioRecord errors

| | | | |

I figured out what the problem was.  I was trying to start recording
from 2 separate threads at the same time causing a conflict.

Although I solved the issue,  I am facing very poor audio quality.  I
tried using MediaRecorder as well with the same poor quality if not
worse.  I verified mic's quality via Audacity otherwise and found no
issues.

So it seems as if emulator might be offering poor support for audio
recording.  Am I missing something?  If this is indeed the issue with
emulator, what options do we have to create/test voice recognition
applications?

Dmitriy

      

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	Matias Alberto de la Vega		更多选项 3月4日, 上午4时46分

发件人：Matias Alberto de la Vega

日期：Wed, 3 Mar 2010 12:46:06 -0800 (PST)

当地时间：2010年3月4日 (星期四) 上午4时46分

主题：Re: Android AudioRecord errors

| | | | |

Dimitry, I've used MediaRecorder in a Nexus One and the quality is not
that great either. Maybe there's something we can do to improve
quality, but I had no time to research on that. I will let you know if
I make progress getting better audio quality. Take care

On 3 mar, 17:25, dmitriy325ci wrote:

> I figured out what the problem was.  I was trying to start recording
> from 2 separate threads at the same time causing a conflict.

> Although I solved the issue,  I am facing very poor audio quality.  I
> tried using MediaRecorder as well with the same poor quality if not
> worse.  I verified mic's quality via Audacity otherwise and found no
> issues.

> So it seems as if emulator might be offering poor support for audio
> recording.  Am I missing something?  If this is indeed the issue with
> emulator, what options do we have to create/test voice recognition
> applications?

> Dmitriy

      

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	dmitriy325ci		更多选项 3月4日, 上午11时48分

发件人：dmitriy325ci

日期：Wed, 3 Mar 2010 19:48:09 -0800 (PST)

当地时间：2010年3月4日 (星期四) 上午11时48分

主题：Re: Android AudioRecord errors

| | | | |

Wow, really?  One of the features of nexus one is voice search.  So
there is got to be a way to record audio on the device with acceptable
quality.   Unfortunately there is not much information available out
there.  So keep me posted if you make any progress.

Thanks,
Dmitriy

On Mar 3, 3:46 pm, Matias Alberto de la Vega

wrote:
> Dimitry, I've used MediaRecorder in a Nexus One and the quality is not
> that great either. Maybe there's something we can do to improve
> quality, but I had no time to research on that. I will let you know if
> I make progress getting better audio quality. Take care

> On 3 mar, 17:25, dmitriy325ci wrote:

> > I figured out what the problem was.  I was trying to start recording
> > from 2 separate threads at the same time causing a conflict.

> > Although I solved the issue,  I am facing very poor audio quality.  I
> > tried using MediaRecorder as well with the same poor quality if not
> > worse.  I verified mic's quality via Audacity otherwise and found no
> > issues.

> > So it seems as if emulator might be offering poor support for audio
> > recording.  Am I missing something?  If this is indeed the issue with
> > emulator, what options do we have to create/test voice recognition
> > applications?

> > Dmitriy

      

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	Matias Alberto de la Vega		更多选项 3月4日, 下午12时08分

发件人：Matias Alberto de la Vega

日期：Wed, 3 Mar 2010 20:08:39 -0800 (PST)

当地时间：2010年3月4日 (星期四) 下午12时08分

主题：Re: Android AudioRecord errors

| | | | |

Voice search is great! how Google makes the magic happen remains a
mistery to me...so far at least. Take care!

On Mar 4, 12:48 am, dmitriy325ci wrote:

> Wow, really?  One of the features of nexus one is voice search.  So
> there is got to be a way to record audio on the device with acceptable
> quality.   Unfortunately there is not much information available out
> there.  So keep me posted if you make any progress.

> Thanks,
> Dmitriy

> On Mar 3, 3:46 pm, Matias Alberto de la Vega

> wrote:
> > Dimitry, I've used MediaRecorder in a Nexus One and the quality is not
> > that great either. Maybe there's something we can do to improve
> > quality, but I had no time to research on that. I will let you know if
> > I make progress getting better audio quality. Take care

> > On 3 mar, 17:25, dmitriy325ci wrote:

> > > I figured out what the problem was.  I was trying to start recording
> > > from 2 separate threads at the same time causing a conflict.

> > > Although I solved the issue,  I am facing very poor audio quality.  I
> > > tried using MediaRecorder as well with the same poor quality if not
> > > worse.  I verified mic's quality via Audacity otherwise and found no
> > > issues.

> > > So it seems as if emulator might be offering poor support for audio
> > > recording.  Am I missing something?  If this is indeed the issue with
> > > emulator, what options do we have to create/test voice recognition
> > > applications?

> > > Dmitriy

      

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