使用Jlayer和AudioTrack实现在线流媒体边下边播功能

来源：互联网发布：单片机音乐乐谱编辑：程序博客网时间：2024/04/28 23:01

jlayer：mp3解码库
http://www.javazoom.net/javalayer/javalayer.html

思路：通过http得到在线音频文件的输入流，将未解码的音频流使用jlayer进行解码操作，保存解码后的音频数据到队列中，通过另一线程读取解码后的音频数据，从而边下边播的功能

/** * 解码操作 */private class DecodeThread extends Thread {        private InputStream inputStream = null;        private URL url = null;        private int sampleRate;        private int channel;        public DecodeThread(URL url, int sampleRate, int channel) {            this.url = url;            this.sampleRate = sampleRate;            this.channel = channel;        }        @Override        public void run() {            try {                ByteArrayOutputStream outStream = new ByteArrayOutputStream(8 * 1024);                HttpURLConnection conn = (HttpURLConnection) url.openConnection();                inputStream = new BufferedInputStream(conn.getInputStream(), 8 * 1024);                Bitstream bitstream = new Bitstream(inputStream);                Decoder decoder = new Decoder();                boolean done = false;                SampleBuffer output;                int frameIndex = 0;                while (!done) {                    Header frameHeader = bitstream.readFrame();                    if (frameHeader == null) {                        done = true;                    } else {                        output = (SampleBuffer) decoder.decodeFrame(frameHeader, bitstream);                        short[] pcm = output.getBuffer();                        byte[] frameData = new byte[pcm.length];                        for (int i = 0; i < pcm.length / 2; i++) {                            int j = i * 2;                            frameData[j] = (byte) (pcm[i] & 0xff);                            frameData[j + 1] = (byte) ((pcm[i] >> 8) & 0xff);                        }                        audioFrame.add(frameData);                        frameIndex++;                    }                    bitstream.closeFrame();                }                //TODO 缓存音频数据                outStream.close();            } catch (IOException e) {                e.printStackTrace();            } catch (BitstreamException e) {                e.printStackTrace();            } catch (DecoderException e) {                e.printStackTrace();            }        }    }

/** * 播放 */private class PlayThread extends Thread {        @Override        public void run() {            mAudioTrack.play();            int tempFrameIndex = 0;            while (!isEnd) {                if (!isPausing) {                    handler.sendEmptyMessage(SimplePlayerHelper.STATE_PLAY);                    try {                        Thread.sleep(50);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                    List<byte[]> tempFrame = new ArrayList<byte[]>();                    synchronized (audioFrame) {                        tempFrame.addAll(audioFrame.subList(tempFrameIndex, tempFrameIndex > audioFrame.size() - 40 ? audioFrame.size() : tempFrameIndex + 40));                    }                    if (tempFrameIndex > 0 && tempFrame.isEmpty()) {                        handler.sendEmptyMessage(SimplePlayerHelper.STATE_END);                        isEnd = true;                        onCompletionListener.onCompletion(mMyAudioTrack);                    }                    for (int i = 0; i < tempFrame.size(); i++) {                        mAudioTrack.write(tempFrame.get(i), 0, tempFrame.get(i).length);                    }                    tempFrameIndex += tempFrame.size();                }            }            audioFrame.clear();            mAudioTrack.stop();        }    }

仅支持MP3流的在线播放功能，可使用其他音频解码库实现多种音频编码格式的在线播放功能

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