缓冲区溢出问题

Question

当我运行下面的代码时，我得到了这个错误 java.nio.BufferOverflowException 我正在尝试从 android 中的相机预览创建视频流，我从相机获取 NV21 字节数据，我尝试转换 mp4 格式 it.When =13=]inputBuffer.put(data);行，请问如何解决？我可以尝试其他方法将字节转换为 .mp4 吗？

private void encode(byte[] data) {
    inputBuffers = mMediaCodec.getInputBuffers();
    outputBuffers = mMediaCodec.getOutputBuffers();

    int inputBufferIndex = mMediaCodec.dequeueInputBuffer(-1);
    if (inputBufferIndex >= 0) {
        ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
        inputBuffer.clear();
        inputBuffer.put(data);
        mMediaCodec.queueInputBuffer(inputBufferIndex, 0, data.length, 0, 0);
    } else {
        return;
    }

    MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
    int outputBufferIndex = mMediaCodec.dequeueOutputBuffer(bufferInfo, 0);
    Log.i(TAG, "outputBufferIndex-->" + outputBufferIndex);
    do {
        if (outputBufferIndex >= 0) {
            ByteBuffer outBuffer = outputBuffers[outputBufferIndex];
            System.out.println("buffer info-->" + bufferInfo.offset + "--"
                    + bufferInfo.size + "--" + bufferInfo.flags + "--"
                    + bufferInfo.presentationTimeUs);
            byte[] outData = new byte[bufferInfo.size];
            outBuffer.get(outData);
            try {
                if (bufferInfo.offset != 0) {
                    fos.write(outData, bufferInfo.offset, outData.length
                            - bufferInfo.offset);
                } else {
                    fos.write(outData, 0, outData.length);
                }
                fos.flush();
                Log.i(TAG, "out data -- > " + outData.length);
                mMediaCodec.releaseOutputBuffer(outputBufferIndex, false);
                outputBufferIndex = mMediaCodec.dequeueOutputBuffer(bufferInfo,
                        0);
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else if (outputBufferIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
            outputBuffers = mMediaCodec.getOutputBuffers();
        } else if (outputBufferIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
            MediaFormat format = mMediaCodec.getOutputFormat();
        }
    } while (outputBufferIndex >= 0);
}

private void initCodec() {
    try {
        fos = new FileOutputStream(mVideoFile, false);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    try {
        mMediaCodec = MediaCodec.createEncoderByType("video/avc");
    } catch (IOException e) {
        e.printStackTrace();
    }
    MediaFormat mediaFormat = MediaFormat.createVideoFormat("video/avc",
            320,
            240);
    mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, 125000);
    mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, 15);
    mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT,
            MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar);
    mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 5);
    mMediaCodec.configure(mediaFormat,
            null,
            null,
            MediaCodec.CONFIGURE_FLAG_ENCODE);
    mMediaCodec.start();

}

Answer 1

您的 MediaCodec 已配置为使用固定尺寸 320x240，这显然小于所使用的相机框架。如果 MediaCodec 需要更小的帧，它将提供更小的 inputBuffers，从而导致 BufferOverflowException.

要解决此问题，请将您的相机配置为使用 320x240 尺寸，或根据当前选择的相机预览尺寸动态配置您的MediaCodec。

缓冲区溢出问题

BufferOverflow issue

android

h.264

android-mediacodec