private void initEncoder(string codec)
{
MediaFormat format = new MediaFormat();
switch (codec)
{
case "amrnb":
audioEncoder = MediaCodec.CreateEncoderByType(MediaFormat.MimetypeAudioAmrNb);
format.SetString(MediaFormat.KeyMime, MediaFormat.MimetypeAudioAmrNb);
format.SetInteger(MediaFormat.KeySampleRate, 8000);
format.SetInteger(MediaFormat.KeyBitRate, 7950);
break;
case "amrwb":
audioEncoder = MediaCodec.CreateEncoderByType(MediaFormat.MimetypeAudioAmrWb);
format.SetString(MediaFormat.KeyMime, MediaFormat.MimetypeAudioAmrWb);
format.SetInteger(MediaFormat.KeySampleRate, 16000);
format.SetInteger(MediaFormat.KeyBitRate, 18250);
break;
default:
throw new Exception("Unknown recorder codec selected " + codec);
}
format.SetInteger(MediaFormat.KeyChannelCount, 1);
format.SetInteger(MediaFormat.KeyMaxInputSize, bufferSize);
audioEncoder.SetCallback(this);
audioEncoder.Configure(format, null, null, MediaCodecConfigFlags.Encode);
audioEncoder.Start();
}
//@Override
//@SuppressLint({ "InlinedApi", "NewApi" })
protected override void encodeWithMediaCodec()
{
int bufferSize = AudioRecord.GetMinBufferSize(mQuality.samplingRate, ChannelIn.Mono, Encoding.Pcm16bit) * 2;
((AACLATMPacketizer)mPacketizer).setSamplingRate(mQuality.samplingRate);
mAudioRecord = new AudioRecord(Android.Media.AudioSource.Mic, mQuality.samplingRate, Android.Media.ChannelIn.Mono, Android.Media.Encoding.Pcm16bit, bufferSize);
mMediaCodec = MediaCodec.CreateEncoderByType("audio/mp4a-latm");
MediaFormat format = new MediaFormat();
format.SetString(MediaFormat.KeyMime, "audio/mp4a-latm");
format.SetInteger(MediaFormat.KeyBitRate, mQuality.bitRate);
format.SetInteger(MediaFormat.KeyChannelCount, 1);
format.SetInteger(MediaFormat.KeySampleRate, mQuality.samplingRate);
format.SetInteger(MediaFormat.KeyAacProfile, (int)MediaCodecInfo.CodecProfileLevel.AACObjectLC);
format.SetInteger(MediaFormat.KeyMaxInputSize, bufferSize);
mMediaCodec.Configure(format, null, null, MediaCodecConfigFlags.Encode);
mAudioRecord.StartRecording();
mMediaCodec.Start();
MediaCodecInputStream inputStream = new MediaCodecInputStream(mMediaCodec);
Java.Nio.ByteBuffer[] inputBuffers = mMediaCodec.GetInputBuffers();
mThread = new Thread(this);
mThread.Start();
// The packetizer encapsulates this stream in an RTP stream and send it over the network
mPacketizer.setInputStream(inputStream);
mPacketizer.start();
mStreaming = true;
}
private void initHwDecoder(string codec)
{
MediaFormat format = new MediaFormat();
string mime_type = null;
switch (codec)
{
case "amrnb":
mime_type = MediaFormat.MimetypeAudioAmrNb;
format.SetInteger(MediaFormat.KeySampleRate, 8000);
format.SetInteger(MediaFormat.KeyBitRate, 7950);
break;
case "amrwb":
mime_type = MediaFormat.MimetypeAudioAmrWb;
format.SetInteger(MediaFormat.KeySampleRate, 16000);
format.SetInteger(MediaFormat.KeyBitRate, 18250);
break;
}
if (mime_type != null)
{
format.SetString(MediaFormat.KeyMime, mime_type);
format.SetInteger(MediaFormat.KeyChannelCount, 1);
format.SetInteger(MediaFormat.KeyMaxInputSize, bufferSize);
format.SetInteger(MediaFormat.KeyLatency, 1);
format.SetInteger(MediaFormat.KeyPriority, 0);
audioDecoder = new HwDecoder(mime_type, format, this);
audioDecoder.start();
}
}