android AMR-NB

常规MediaRecorder使用

1.http://blog.sina.com.cn/s/blog_51396f890102e0jg.html

2.http://www.cnblogs.com/skyseraph/archive/2012/03/31/2427593.html

MediaRecorder相关

参考：【Android學習專題】多媒體篇：MediaRecoder 实现录像机和【Android學習專題】多媒體篇：MediaRecorder 实现录音机

另附initiativeVideo核心模块

private boolean initializeVideo()    {        try        {            Log.i(TAG,"##initializeVideo....");            // 〇state: Initial 实例化MediaRecorder对象            if (mSurfaceView == null)            {                Log.e(TAG,"mSurfaceView is null in initializeVideo");                return false;            }            if(mMediaRecorder == null)                mMediaRecorder = new MediaRecorder();            else                mMediaRecorder.reset();                                                // 〇state: Initial=>Initialized            // set audio source as Microphone, video source as camera            // specified before settings Recording-parameters or encoders，called only before setOutputFormat            mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);             //mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);                        // 〇state: Initialized=>DataSourceConfigured            // 设置錄製視頻输出格式            //     THREE_GPP:    3gp格式，H263视频ARM音频编码            //    MPEG-4:        MPEG4 media file format            //    RAW_AMR:    只支持音频且音频编码要求为AMR_NB            //    AMR_NB:                    //    ARM_MB:                    //    Default:                // 3gp or mp4            //Android支持的音频编解码仅为AMR_NB；支持的视频编解码仅为H263，H264只支持解码；支持对JPEG编解码；输出格式仅支持.3gp和.mp4            String lVideoFileFullPath;                lVideoFileFullPath = ".3gp"; //.mp4            mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);                //mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);            Log.i(TAG, "Video：Current container format: "+"3GP\n");                        // 设置視頻/音频文件的编码：AAC/AMR_NB/AMR_MB/Default            //    video: H.263, MP4-SP, or H.264                mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);            //mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);            //mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);            Log.i(TAG, "Video：Current encoding format: "+"H264\n");                                    // audio: AMR-NB            //mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);                        // 设置视频录制的分辨率。必须放在设置编码和格式的后面，否则报错            //mMediaRecorder.setVideoSize(176, 144);            mMediaRecorder.setVideoSize(320, 240);            //mMediaRecorder.setVideoSize(720, 480);                Log.i(TAG, "Video：Current Video Size: "+"320*240\n");                                    // 设置录制的视频帧率。必须放在设置编码和格式的后面，否则报错            mMediaRecorder.setVideoFrameRate(FRAME_RATE);                            // 预览            mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());                            // 设置输出文件方式： 直接本地存储   or LocalSocket远程输出            if(bIfNativeORRemote)    //Native            {                lVideoFileFullPath = strRecVideoFilePath + String.valueOf(System.currentTimeMillis()) + lVideoFileFullPath;                mRecVideoFile = new File(lVideoFileFullPath);                // mMediaRecorder.setOutputFile(mRecVideoFile.getAbsolutePath());                mMediaRecorder.setOutputFile(mRecVideoFile.getPath());    //called after set**Source before prepare                Log.i(TAG, "start write into file~");            }            else    //Remote            {                mMediaRecorder.setOutputFile(sender.getFileDescriptor()); //设置以流方式输出                 Log.i(TAG, "start send into sender~");            }                        //             mMediaRecorder.setMaxDuration(0);//called after setOutputFile before prepare,if zero or negation,disables the limit            mMediaRecorder.setMaxFileSize(0);//called after setOutputFile before prepare,if zero or negation,disables the limit            try            {                     mMediaRecorder.setOnInfoListener(this);                mMediaRecorder.setOnErrorListener(this);                // 〇state: DataSourceConfigured => prepared                mMediaRecorder.prepare();                // 〇state: prepared => recording                mMediaRecorder.start();                bIfRecInProcess = true;                Log.i(TAG, "initializeVideo Start!");            } catch (Exception e)            {                        releaseMediaRecorder();                finish();                e.printStackTrace();            }            return true;        } catch (Exception e)        {            // TODO: handle exception            e.printStackTrace();            return false;        }    }

ANDROID如何实时获取录音AMR流

如题，想要实时获取录音的AMR流，有两种思路:
一种是用AudioRecord获取PCM数据然后编码生成AMR流
还有就是用MediaRecord获取音频流但不保存至文件而是映射到SOCKET这样就能实时获取

针对第一钟，上网找没找着已经封装好了的JNI库
第二种不知道如何去实现

哪位大虾有做过这方面的能发个DEMO给在下么，不甚感激

http://hi-android.info/src/android/media/AmrInputStream.java.html

/* * Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package android.media;import android.util.Config;import android.util.Log;import java.io.InputStream;import java.io.IOException;/** * AmrInputStream * @hide */public final class AmrInputStream extends InputStream{        static {        System.loadLibrary("media_jni");    }        private final static String TAG = "AmrInputStream";        // frame is 20 msec at 8.000 khz    private final static int SAMPLES_PER_FRAME = 8000 * 20 / 1000;        // pcm input stream    private InputStream mInputStream;        // native handle    private int mGae;        // result amr stream    private byte[] mBuf = new byte[SAMPLES_PER_FRAME * 2];    private int mBufIn = 0;    private int mBufOut = 0;        // helper for bytewise read()    private byte[] mOneByte = new byte[1];        /**     * Create a new AmrInputStream, which converts 16 bit PCM to AMR     * @param inputStream InputStream containing 16 bit PCM.     */    public AmrInputStream(InputStream inputStream) {        mInputStream = inputStream;        mGae = GsmAmrEncoderNew();        GsmAmrEncoderInitialize(mGae);    }    @Override    public int read() throws IOException {        int rtn = read(mOneByte, 0, 1);        return rtn == 1 ? (0xff & mOneByte[0]) : -1;    }        @Override    public int read(byte[] b) throws IOException {        return read(b, 0, b.length);    }    @Override    public int read(byte[] b, int offset, int length) throws IOException {        if (mGae == 0) throw new IllegalStateException("not open");                // local buffer of amr encoded audio empty        if (mBufOut >= mBufIn) {            // reset the buffer            mBufOut = 0;            mBufIn = 0;                        // fetch a 20 msec frame of pcm            for (int i = 0; i < SAMPLES_PER_FRAME * 2; ) {                int n = mInputStream.read(mBuf, i, SAMPLES_PER_FRAME * 2 - i);                if (n == -1) return -1;                i += n;            }                        // encode it            mBufIn = GsmAmrEncoderEncode(mGae, mBuf, 0, mBuf, 0);        }                // return encoded audio to user        if (length > mBufIn - mBufOut) length = mBufIn - mBufOut;        System.arraycopy(mBuf, mBufOut, b, offset, length);        mBufOut += length;                return length;    }    @Override    public void close() throws IOException {        try {            if (mInputStream != null) mInputStream.close();        } finally {            mInputStream = null;            try {                if (mGae != 0) GsmAmrEncoderCleanup(mGae);            } finally {                try {                    if (mGae != 0) GsmAmrEncoderDelete(mGae);                } finally {                    mGae = 0;                }            }        }    }    @Override    protected void finalize() throws Throwable {        if (mGae != 0) {            close();            throw new IllegalStateException("someone forgot to close AmrInputStream");        }    }        //    // AudioRecord JNI interface    //    private static native int GsmAmrEncoderNew();    private static native void GsmAmrEncoderInitialize(int gae);    private static native int GsmAmrEncoderEncode(int gae,            byte[] pcm, int pcmOffset, byte[] amr, int amrOffset) throws IOException;    private static native void GsmAmrEncoderCleanup(int gae);    private static native void GsmAmrEncoderDelete(int gae);}

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