MediaCodec Demo

来源：互联网发布：ctp交易接口源码编辑：程序博客网时间：2024/05/29 14:34
package com.example.wan.audiocodec;import android.media.MediaCodec;import android.media.MediaExtractor;import android.media.MediaFormat;import android.util.Log;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.nio.ByteBuffer;/** * Created by wan on 2016/4/17. */public class AudioCodec {    private String TAG = "Audio";    private MediaCodec mDecoder;    private MediaExtractor mExtractor;    private String srcPath;    private String desPath;    private ByteBuffer[] mInputBuffers;    private ByteBuffer[] mOutputBuffers;    private MediaCodec.BufferInfo info;    private MediaFormat mFormat;    private int mChannels;    private long mDurations;    private int mBitrate;    private int mSampleRate;    private boolean mInputEOS = false;    private boolean mOutputEOS = false;    private FileOutputStream mOutFile;    private OnCompletedListner mCompletedListener;    public interface OnCompletedListner {        void onCompleted();    }    public void setOnCompletedListener(OnCompletedListner listener) {        this.mCompletedListener = listener;    }    public static AudioCodec getInstance() {        return new AudioCodec();    }    public void setIOPath(String srcPath, String desPath) {        this.srcPath = srcPath;        this.desPath = desPath;    }    public int prepare() {        mExtractor = new MediaExtractor();        try {            mExtractor.setDataSource(srcPath);            int trackCounts = mExtractor.getTrackCount();            for (int i = 0; i<trackCounts; i++) {                mFormat = mExtractor.getTrackFormat(i);                String mime = mFormat.getString(MediaFormat.KEY_MIME);                Log.e(TAG, "prepare mime = " + mime + ", mFormat = " + mFormat);                if (mime.startsWith("audio")) {                    mExtractor.selectTrack(i);                    mSampleRate = mFormat.getInteger(MediaFormat.KEY_SAMPLE_RATE);                    //mBitrate = mFormat.getInteger(MediaFormat.KEY_BIT_RATE);                    mDurations = mFormat.getLong(MediaFormat.KEY_DURATION);                    mChannels = mFormat.getInteger(MediaFormat.KEY_CHANNEL_COUNT);                    Log.e(TAG, "mSampleRate = " + mSampleRate                            //+  ", mBitrate = " + mBitrate                            +  ", mDurations = " + mDurations                            +  ", mChannels = " + mChannels);                    mDecoder = MediaCodec.createDecoderByType(mime);                    mDecoder.configure(mFormat, null, null, 0);                    break;                }            }        } catch (IOException e) {            e.printStackTrace();            return -1;        }        if (mDecoder == null) {            Log.e(TAG, "create decoder failed");            return -1;        }        mDecoder.start();        mInputBuffers = mDecoder.getInputBuffers();        mOutputBuffers = mDecoder.getOutputBuffers();        info = new MediaCodec.BufferInfo();        try {            mOutFile = new FileOutputStream(desPath);        } catch (FileNotFoundException e) {            e.printStackTrace();            return -1;        }        Log.e(TAG, "prepare done");        return 0;    }    private class InputRunnable  implements Runnable {        @Override        public void run() {            processInput();        }    }    private class OutputRunnable  implements Runnable {        @Override        public void run() {            processOutput();            if (mCompletedListener !=  null) {                mCompletedListener.onCompleted();            }            Log.e(TAG, "Completed");        }    }    public void startAsync() {        Log.e(TAG, "start Async...");        new Thread(new InputRunnable()).start();        new Thread(new OutputRunnable()).start();    }    private void processInput() {        while (!mInputEOS) {            int inputBufferIndex = mDecoder.dequeueInputBuffer(-1);            if (inputBufferIndex >= 0) {                ByteBuffer inputBuffer = mInputBuffers[inputBufferIndex];                int sampleSize = mExtractor.readSampleData(inputBuffer, 0);                if (sampleSize >= 0) {                    mDecoder.queueInputBuffer(inputBufferIndex, 0, sampleSize, 0, 0);                    mExtractor.advance();                } else  {                    Log.e(TAG, "input EOS");                    mInputEOS = true;                    mDecoder.queueInputBuffer(inputBufferIndex, 0, 0, 0,                             MediaCodec.BUFFER_FLAG_END_OF_STREAM );                }            }        }    }    private void processOutput() {        while (!mOutputEOS) {            int outputBufferIndex = mDecoder.dequeueOutputBuffer(info, -1);            if (outputBufferIndex >= 0) {                ByteBuffer outputBuffer = mOutputBuffers[outputBufferIndex];                byte[] chunkPCM = new byte[info.size];                outputBuffer.get(chunkPCM);                outputBuffer.clear();                try {                    mOutFile.write(chunkPCM);                } catch (IOException e) {                    e.printStackTrace();                }                mDecoder.releaseOutputBuffer(outputBufferIndex, false);                if ((info.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {                    Log.e(TAG, "output EOS");                    mOutputEOS = true;                }            }        }    }    public void release() {        try {            if (mOutFile != null) {                mOutFile.close();            }        } catch (IOException e) {            e.printStackTrace();        } finally {            mOutFile = null;        }        if (mDecoder != null) {            mDecoder.stop();            mDecoder.release();            mDecoder = null;        }        if (mExtractor != null) {            mExtractor.release();            mExtractor = null;        }        mOutputEOS = false;        mInputEOS = false;    }}
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