How to record a wave file

Record of sending PTT

1. onChannelLocked
- create a wave file
- write an wave header

2. onTrackDataCaptured
- write a frame to the file.

3. onChannelUnlocked
- write a final wave header at position 0.
- close the file.
- add to DB

Record of receiving PTT

1. onChannelLocked
- create a wave file
- write an wave header

2. onTrackDataRendered
- write a frame to the file.

3. onChannelUnlocked
- write a final wave header at position 0.
- close the file.
- add to DB

Android sample

WaveContainer: Muxer for wave. download WaveContainer.java

WaveContainer waveContainer = new WaveContainer();

// Locked
int channelCount = 1;
int sampleRate = 16000; //In case of onTrackDataRendered, it is 16000. But onTrackDataCaptured, it is depended on lockMediaprofile. (8000/16000)
int bitPerSample = 16;
int byteRate = bitPerSample / 8 * sampleRate * channelCount;
waveContainer.initialize(channelCount,sampleRate,bitPerSample,byteRate);
waveContainer.open(Environment.getExternalStorageDirectory()+"/Download/test.wav");

// onTrackDataCaptured or onTrackDataRendered
waveContainer.writeFrame(trackDataBuffer,dataLength);

// Unlocked
waveContainer.close();

iOS sample

int sampleRate = 16000; //Always 16000