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我想使用 G-Streamer 将音频从我的 Raspberry 流式传输到我的 Android 手机。在 Gstreamer 中，我使用以下管道： gst-launch-1.0 audiotestsrc ！法克！“音频/mpeg，mpegversion=4”！多路复用器。mpegtsmux 名称=mux ！udpsink 主机=224.0.0.1 端口=8001

faac 将音频编码为 AAC LC ( https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-plugins/html/gst-plugins-bad-plugins-faac.html )

和 mpegtsmux 创建一个 MPEG-TS 流（https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-plugins/html/gst-plugins-bad-plugins-mpegtsmux.html）

我尝试自己用 Android Studio 制作 Android 应用程序。我正在使用 Multicastsocket 接收数据。然后我尝试使用媒体编解码器和媒体提取器实现 AAC 解码器。extractor.setDataSource 方法不能直接使用套接字，所以我将数据写入文件，让提取器从文件中获取数据并将其传递给 MediaCodec 以创建解码器。

提取器似乎意识到它的 AAC 但我认为解码器有问题。这是代码的重要部分：

MediaExtractor extractor = new MediaExtractor();
    Uri path = Uri.fromFile(file);

    extractor.setDataSource(path.toString());

format = extractor.getTrackFormat(0); 
        String mime = format.getString(MediaFormat.KEY_MIME); 
        decoder = MediaCodec.createDecoderByType(mime); 
        decoder.configure(format, null, null, 0); 


        while (!stopTrack) { 


            multicastSocket.receive(packet); 

            decoder.start(); 
            data = packet.getData(); 

            inputBuffers = decoder.getInputBuffers(); 
            outputBuffers = decoder.getOutputBuffers(); 
            inputBufferIndex = decoder.dequeueInputBuffer(-1); 

            if (inputBufferIndex >= 0) 
            { 
                inputBuffer = inputBuffers[inputBufferIndex]; 
                inputBuffer.clear(); 

                inputBuffer.put(data); 

                decoder.queueInputBuffer(inputBufferIndex, 0, data.length, 0, 0); 
            } 

            bufferInfo = new MediaCodec.BufferInfo(); 
            outputBufferIndex = decoder.dequeueOutputBuffer(bufferInfo, 0); 

            while (outputBufferIndex >= 0) 
            { 
                outputBuffer = outputBuffers[outputBufferIndex]; 

                outputBuffer.position(bufferInfo.offset); 
                outputBuffer.limit(bufferInfo.offset + bufferInfo.size); 

                outData = new byte[bufferInfo.size]; 
                outputBuffer.get(outData); 

                //  Log.d("AudioDecoder", outData.length + " bytes decoded"); 

               track.write(outData, 0, outData.length); 

                decoder.releaseOutputBuffer(outputBufferIndex, false); 
                outputBufferIndex = decoder.dequeueOutputBuffer(bufferInfo, 0); 

            }

这些是我在 logcat 中收到的所有消息：

D/ExtendedUtils: Try creating ExtendedExtractor 
E/MM_OSAL: FileSource::FileSource 
E/MM_OSAL: FileSource::FileSource m_bEveryThingOK 1 
E/MM_OSAL: MM_File_Create File Name /data/mmosal_logmask.cfg , Mode 0 
E/MM_OSAL: MM_File_Create failed .Efs Error No -1 , File Name      /data/mmosal_logmask.cfg , Mode 0 
E/MM_OSAL: Open or read fail on /data/mmosal_logmask.cfg. Possible permission denied issue. Looking for /data/misc/media/mmosal_logmask.cfg 
E/MM_OSAL: MM_File_Create File Name /data/misc/media/mmosal_logmask.cfg , Mode 0  
E/MM_OSAL: MM_File_Create failed .Efs Error No -1 , File Name /data/misc/media/mmosal_logmask.cfg , Mode 0 
E/MMParserExtractor:  FileSourceWrapper::New returned NULL 
D/ExtendedUtils: default extractor is NULL, return extended extractor 
E/MM_OSAL: FileSource::FileSource 
E/MM_OSAL: FileSource::FileSource m_bEveryThingOK 1 
E/MM_OSAL: MM_File_Create File Name /data/mmosal_logmask.cfg , Mode 0 
E/MM_OSAL: MM_File_Create failed .Efs Error No -1 , File Name /data/mmosal_logmask.cfg , Mode 0 
E/MM_OSAL: Open or read fail on /data/mmosal_logmask.cfg. Possible permission denied issue. Looking for /data/misc/media/mmosal_logmask.cfg 
E/MM_OSAL: MM_File_Create File Name /data/misc/media/mmosal_logmask.cfg , Mode 0 
E/MM_OSAL: MM_File_Create failed .Efs Error No -1 , File Name /data/misc/media/mmosal_logmask.cfg , Mode 0 
E/MM_OSAL: parseTransportStreamPacket isPESPacket failed 18954 
E/MM_OSAL: parseTransportStreamPacket isPESPacket failed 18783 
E/MM_OSAL: parseTransportStreamPacket isPESPacket failed 18954 
E/MM_OSAL: parseTransportStreamPacket isPESPacket failed 18783 
I/OMXClient: Using client-side OMX mux. 
E/OMXMaster: A component of name 'OMX.qcom.audio.decoder.aac' already exists, ignoring this one. 
D/MediaCodec: MediaCodec[kWhatConfigure]: video-output-protection: 00000000, audio-output-protection: 00000000 
E/Format:: audio/mp4a-latm 
W/SoftAAC2: aacDecoder_DecodeFrame decoderErr = 0x4004 
W/SoftAAC2: AAC decoder returned error 0x4004, substituting silence 
I/SoftAAC2: Reconfiguring decoder: 0->44100 Hz, 0->0 channels

正如我所说，我将一些音频数据写入了提取器从中获取信息的文件中。这个文件可以播放！即使使用普通的 Android 音乐应用程序。所以我认为接收数据的部分运作良好。提取器或解码器一定有问题，可能是解码器，因为提取器意识到格式是 AAC。我还下载了 AAC 测试文件，但同样的问题和失败消息。

我希望有一个人可以帮助我！谢谢你的帮助！

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