[转载]使用EasyRTMP的Android版采集AAC音频流进行RTMP推送

来源：互联网发布：世界十大灾难片知乎编辑：程序博客网时间：2024/05/21 02:19

本文转自EasyDarwin团队kim的博客：http://blog.csdn.net/jinlong0603/article/details/52963378

EasyRTMP Android版demo中，通过使用AudioRecord录音，然后将每一帧数据通过MediaCodec编码成LATM格式音频，然后就发送给服务器就OK了。

AudioRecord的使用

public void startRecord() {        try {            init();            mAudioRecord.startRecording();            mMediaCodec.start();            final ByteBuffer[] inputBuffers = mMediaCodec.getInputBuffers();            mThread = new Thread(new Runnable() {                @Override                public void run() {                    Process.setThreadPriority(Process.THREAD_PRIORITY_AUDIO);                    int len = 0, bufferIndex = 0;                    try {                        while (!Thread.interrupted() && !stoped) {                            bufferIndex = mMediaCodec.dequeueInputBuffer(50000);                            if (bufferIndex >= 0) {                                inputBuffers[bufferIndex].clear();                                len = mAudioRecord.read(inputBuffers[bufferIndex], BUFFER_SIZE);                                if (len == AudioRecord.ERROR_INVALID_OPERATION || len == AudioRecord.ERROR_BAD_VALUE) {                                    mMediaCodec.queueInputBuffer(bufferIndex, 0, 0, 0, 0);                                } else {                                    mMediaCodec.queueInputBuffer(bufferIndex, 0, len, 0, 0);                                }                            }                        }                    } catch (RuntimeException e) {                        Log.i(TAG, "record" + e.getMessage());                    }                }            }, "AACRecoder");            mThread.start();            startEncode();        } catch (Exception e) {            Log.e(TAG, "Record___Error!!!!!");        }    }

在循环中通过mAudioRecord.read(inputBuffers[bufferIndex], BUFFER_SIZE)不断的读取音频，然后放入编码队列中去。新开一个线程用来获取队列中的数据：

private void startEncode() {        mBuffers = mMediaCodec.getOutputBuffers();        mBuffer=null;        encodeThread = new Thread(new Runnable() {            @Override            public void run() {                while (!Thread.interrupted() && !stoped) {                    try {                        if (mBuffer == null) {                            mBuffer = ByteBuffer.allocate(10240);                            while (!Thread.currentThread().isInterrupted() && !stoped) {                                mIndex = mMediaCodec.dequeueOutputBuffer(mBufferInfo, 50000);                                if (mIndex >= 0) {                                    if (mBufferInfo.flags == MediaCodec.BUFFER_FLAG_CODEC_CONFIG) {                                        continue;                                    }                                    mBuffer.clear();                                    mBuffer.position(0);                                    mBuffers[mIndex].get(mBuffer.array(), 0, mBufferInfo.size);                                    mBuffers[mIndex].clear();                                    mBuffer.position(mBuffer.position() + mBufferInfo.size);                                    mBuffer.flip();                                    break;                                } else if (mIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {                                    mBuffers = mMediaCodec.getOutputBuffers();                                } else if (mIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {                                    Log.v(TAG, "output format changed...");                                } else if (mIndex == MediaCodec.INFO_TRY_AGAIN_LATER) {                                    Log.v(TAG, "No buffer available...");                                } else {                                    Log.e(TAG, "Message: " + mIndex);                                }                            }                        }                        int size = mBufferInfo.size;                        byte[] buffer = new byte[size];                        mBuffer.get(buffer);                        easyPusher.push(buffer,System.currentTimeMillis(), 0);                        if (mBuffer.position() >= size) { // read complete                            mMediaCodec.releaseOutputBuffer(mIndex, false);                            mBuffer = null;                        }                    } catch (RuntimeException e) {                                                Log.i(TAG, "record" + e.getMessage());                    }                }            }        }, "AACEncoder");        encodeThread.start();    }

EasyRTMP推送RTMP流时不需要添加ADTS头部。而EasyPusher推送RTSP流需要添加ADTS。

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