recording

    private boolean isHeAacEncoderSupported() {
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
            int numCodecs = MediaCodecList.getCodecCount();

            for (int i = 0; i < numCodecs; i++) {
                MediaCodecInfo codecInfo = MediaCodecList.getCodecInfoAt(i);

                if (!codecInfo.isEncoder()) {
                    continue;
                }

                for (String supportedType : codecInfo.getSupportedTypes()) {
                    if (supportedType.equalsIgnoreCase(MIMETYPE_AUDIO_AAC)) {
                        MediaCodecInfo.CodecCapabilities cap = codecInfo.getCapabilitiesForType(MIMETYPE_AUDIO_AAC);
                        MediaCodecInfo.CodecProfileLevel[] profileLevels = cap.profileLevels;
                        for (MediaCodecInfo.CodecProfileLevel profileLevel : profileLevels) {
                            int profile = profileLevel.profile;
                            if (profile == MediaCodecInfo.CodecProfileLevel.AACObjectHE || profile == MediaCodecInfo.CodecProfileLevel.AACObjectHE_PS) {
                                return true;
                            }
                        }
                    }
                }
            }
        }

        return false;
    }
    
    private void startMediaRecorder() {
        mediaRecorder = new MediaRecorder();
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mediaRecorder.setAudioChannels(1);
        mediaRecorder.setAudioSamplingRate(8000);
        mediaRecorder.setAudioEncodingBitRate(32000);

        mediaRecorder.setMaxDuration(RECORDING_MEDIA_RECORDER_MAX_DURATION);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            if (isHeAacEncoderSupported()) {
                mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.HE_AAC);
                trackEvent("startMediaRecorder", "setAudioEncoder", "HE_AAC");
            } else {
                mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
                trackEvent("startMediaRecorder", "setAudioEncoder", "AAC");
            }
        } else {
            mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
            trackEvent("startMediaRecorder", "setAudioEncoder", "AAC");
        }