Android MediaCodec解码AAC，AudioTrack播放PCM音频

package lavender.com.myaudiodecoder; import android.content.Context; import android.media.AudioFormat; import android.media.AudioManager; import android.media.AudioTrack; import android.media.MediaCodec; import android.media.MediaCodecInfo; import android.media.MediaFormat; import android.util.Log; import java.io.IOException; import java.io.InputStream; import java.nio.ByteBuffer; /** * @author lavender * @createtime 2018/5/24 * @desc */ public class AudioDecoder { private MediaCodec audioDecoder;//音频解码器 private static final String TAG = "AACDecoderUtil"; //声道数 private static final int KEY_CHANNEL_COUNT = 1; //采样率 private static final int KEY_SAMPLE_RATE = 16000; private final Object obj = new Object(); private Thread audioThread; private long prevPresentationTimes; private InputStream inputStream; private Context context; private MediaCodec.BufferInfo encodeBufferInfo; private ByteBuffer[] encodeInputBuffers; private ByteBuffer[] encodeOutputBuffers; public boolean isStop = false; public AudioDecoder(Context context) { this.context = context; prepare(); } /** * 获取当前的时间戳 * * @return */ private long getPTSUs() { long result = System.nanoTime() / 1000; if (result < prevPresentationTimes) { result = (prevPresentationTimes - result) + result; } return result; } /** * 开启解码播放 */ public void startPlay() { isStop = false; prevPresentationTimes = 0; audioThread = new Thread(new AudioThread(), "Audio Thread"); audioThread.start(); try { audioThread.join(); } catch (InterruptedException e) { e.printStackTrace(); return; } } /** * 停止并且重启解码器以便下次使用 */ public void stop() { isStop = true; if (audioThread != null) { audioThread.interrupt(); } try { audioDecoder.stop(); audioDecoder.release(); prepare(); } catch (RuntimeException e) { e.printStackTrace(); } } public class AudioThread implements Runnable { int SAMPLE_RATE = 16000; //采样率8K或16k private AudioTrack audioTrack; private int buffSize = 0; private int bufferSizeInBytes = 0; int size = 0; public AudioThread() { bufferSizeInBytes = AudioTrack.getMinBufferSize(SAMPLE_RATE, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT); audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,//播放途径 外放 SAMPLE_RATE, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSizeInBytes * 4, AudioTrack.MODE_STREAM); //启动AudioTrack audioTrack.play(); // inputStream = context.getResources().openRawResource(R.raw.myaudio); try { size = inputStream.available(); } catch (IOException e) { e.printStackTrace(); } } @Override public void run() { try { while (buffSize <size) { //数据一定要一帧一帧取出来放到解码器中，否则会报解码器的状态不正确 byte[] audioBuffer = new byte[519]; int ret=inputStream.read(audioBuffer,0,519); Log.i("ret---------->", ret + ""); if(ret>0){ Log.e("audioBuffer---->", audioBuffer.length + ""); decode(audioBuffer, 0, ret, audioTrack); buffSize += 519; } } inputStream.close(); } catch (IOException e) { e.printStackTrace(); } stop(); } } /** * 初始化音频解码器 * * @return 初始化失败返回false，成功返回true */ public boolean prepare() { // 初始化AudioTrack try { //需要解码数据的类型 String mine = "audio/mp4a-latm"; //初始化解码器 audioDecoder = MediaCodec.createDecoderByType(mine); //MediaFormat用于描述音视频数据的相关参数 MediaFormat mediaFormat = MediaFormat.createAudioFormat(MediaFormat.MIMETYPE_AUDIO_AAC, 16000, 1); //数据类型 mediaFormat.setString(MediaFormat.KEY_MIME, mine); //采样率 mediaFormat.setInteger(MediaFormat.KEY_SAMPLE_RATE, KEY_SAMPLE_RATE);//16k //声道个数 mediaFormat.setInteger(MediaFormat.KEY_CHANNEL_COUNT, KEY_CHANNEL_COUNT);//单声道 mediaFormat.setInteger(MediaFormat.KEY_CHANNEL_MASK, AudioFormat.CHANNEL_IN_MONO); mediaFormat.setInteger(MediaFormat.KEY_MAX_INPUT_SIZE, 1024);//作用于inputBuffer的大小 //比特率 mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, 64000); //用来标记AAC是否有adts头，1->有 mediaFormat.setInteger(MediaFormat.KEY_IS_ADTS, 1); mediaFormat.setInteger(MediaFormat.KEY_AAC_PROFILE, MediaCodecInfo.CodecProfileLevel.AACObjectLC); //ByteBuffer key（参数代表 单声道，16000采样率，AAC LC数据） // *******************根据自己的音频数据修改data参数************************************************* byte[] data = new byte[]{(byte) 0x14, (byte) 0x08}; ByteBuffer csd_0 = ByteBuffer.wrap(data); mediaFormat.setByteBuffer("csd-0", csd_0); //解码器配置 audioDecoder.configure(mediaFormat, null, null, 0); } catch (IOException e) { e.printStackTrace(); return false; } if (audioDecoder == null) { return false; } audioDecoder.start(); encodeInputBuffers = audioDecoder.getInputBuffers(); encodeOutputBuffers = audioDecoder.getOutputBuffers(); encodeBufferInfo = new MediaCodec.BufferInfo(); return true; } /** * aac音频解码+播放 */ public void decode(byte[] buf, int offset, int length, AudioTrack audioTrack) { //等待时间，0->不等待，-1->一直等待 long kTimeOutUs = 1000; try { //返回一个包含有效数据的input buffer的index,-1->不存在 int inputBufIndex = audioDecoder.dequeueInputBuffer(kTimeOutUs); Log.i("inputBufIndex**", "\n"+inputBufIndex + "\n"); if (inputBufIndex >= 0) { //获取当前的ByteBuffer ByteBuffer dstBuf = encodeInputBuffers[inputBufIndex]; //清空ByteBuffer dstBuf.clear(); //填充数据 dstBuf.put(buf, 0, length); //将指定index的input buffer提交给解码器 audioDecoder.queueInputBuffer(inputBufIndex, 0, length, getPTSUs(), 0); } //返回一个output buffer的index，-1->不存在 int outputBufferIndex = audioDecoder.dequeueOutputBuffer(encodeBufferInfo, kTimeOutUs); Log.i("outputBufferIndex**", "\n"+outputBufferIndex + "\n"); ByteBuffer outputBuffer; while (outputBufferIndex > 0) { //获取解码后的ByteBuffer out