I'm using a class that uses AudioRecord.
RehearsalAudioRecorder recorder = new
RehearsalAudioRecorder(
RehearsalAudioRecorder.RECORDING_UNCOMPRESSED,
MediaRecorder.AudioSource.MIC,
16000,
AudioFormat.CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT);
The RehearsalAudioRecorder constructor instantiates an AudioRecord:
aRecorder = new AudioRecord(audioSource,
sampleRate, channelConfig, audioFormat, bufferSize);
I'm creating a .wav file on the SD card.
I'm experiencing a 5 second delay in the recording; I play back the
file, and the recording starts about 5 seconds after I started
speaking.
I did some measurements with System.currentTimeMillis(), and I
measured the following:
buffer size: 204800 bytes
constructor: 17 ms
write the file header: 6 ms
AudioRecord.startRecording(): 483 ms
AudioRecord.read(): 6268 ms
There's correspondingly less delay when I use a smaller buffer:
buffer size: 81920 bytes
constructor: 16 ms
write the file header: 5 ms
AudioRecord.startRecording(): 486 ms
AudioRecord.read(): 2427 ms
Does anyone have any suggestions as to how to reduce the delay? It's
still unacceptable to have a few seconds delay.
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