Question

我正在做一个项目，我将直接从mp3文件中解码数据，并将获得的pcm数据存储到SD卡中的临时文件夹temp.pcm中，以供日后分析。我在解码数据时遇到了麻烦......

        //a short array to store raw pcm data
        short[] buffer = new short[bufferSize];

        ByteArrayOutputStream outStream = new ByteArrayOutputStream(1024);
        File filep = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/onenineoone.mp3");

        InputStream inputStream = new BufferedInputStream(new FileInputStream(filep), 8 * 1024);
        short[] pcm=null;

        try
        {
            Bitstream bitstream = new Bitstream(inputStream);
            boolean done = false;

            while (!done)
            {

                javazoom.jl.decoder.Header frameHeader = bitstream.readFrame();
                javazoom.jl.decoder.Decoder decoder = new javazoom.jl.decoder.Decoder;

                SampleBuffer output = (SampleBuffer) decoder.decodeFrame(frameHeader, bitstream);
                ****Log.i("decoder", "error in the samplebuffer??");****
                if (output.getSampleFrequency() != 44100 || output.getChannelCount() != 1) throw new DecoderException("Stereo or non-44100 sampling rate .mp3 not supported", null);
                    pcm = output.getBuffer();

                for (short s:pcm) {
                   outStream.write(s);
                 }
                buffer=pcm;
            }    
            done = true;
            bitstream.closeFrame();

        }   catch (BitstreamException e) {
            throw new IOException("Bitstream error: " + e);
        }   catch (DecoderException e) {
               Log.w("error is:", "Decoder error", e);
        }

**解决的
我声明私有javazoom.jl.decoder.Decoder解码器作为全局密钥，但似乎它不能进入SampleBuffer的错误是我必须将其声明为javazoom.jl.decoder.Decoder decoder = new javazoom.jl .decoder.Decoder。

Answer 1

在File filep上打开两次InputStream是没有意义的（对我而言）。在打开第二个流之前，您甚至没有关闭第一个流。请先修改该代码。

Android Java：解码mp3文件并将数据传递到short []数组进行分析

1 个答案: