setPreviewCallbackWithBuffer

setPreviewCallbackWithBuffer

正如@Aegonis在此post中所问的

我正在尝试将Camera与Android连接以对视频帧进行编码。

问题是,在这一部分中,尝试与他做同样的事情,就像在他的主题中发布的另外两个用户一样,它崩溃了:

// called from Camera.setPreviewCallbackWithBuffer(...) in other class
public void encoder(byte[] input) {
try {
    ByteBuffer[] inputBuffers = mediaCodec.getInputBuffers();
    ByteBuffer[] outputBuffers = mediaCodec.getOutputBuffers();
    int inputBufferIndex = mediaCodec.dequeueInputBuffer(-1);
    if (inputBufferIndex >= 0) {
        ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
        inputBuffer.clear();
        inputBuffer.put(input);
        mediaCodec.queueInputBuffer(inputBufferIndex, 0, input.length, 0, 0);
    }
...


我从setPreviewCallbackWithBuffer进行的呼叫是这样的:

    int bufSize= 460800;
        camera.addCallbackBuffer(new byte[bufSize]);
        camera.setPreviewCallbackWithBuffer(new PreviewCallback() {

            public void onPreviewFrame(byte[] data, Camera arg1) {
                    codecs.encoder(data);
            }
        });
...


出现以下错误消息

03-04 20:30:46.762: E/AndroidRuntime(26196): java.nio.BufferOverflowException
03-04 20:30:46.762: E/AndroidRuntime(26196): at java.nio.Buffer.checkPutBounds(Buffer.java:189)
03-04 20:30:46.762: E/AndroidRuntime(26196): at java.nio.ReadWriteDirectByteBuffer.put(ReadWriteDirectByteBuffer.java:100)
03-04 20:30:46.762: E/AndroidRuntime(26196): at java.nio.ByteBuffer.put(ByteBuffer.java:712)


很好,字节缓冲区很大,但是setPreviewCallbackWithBuffer告诉您至少使用一个大小为460800的缓冲区。那么...您将如何解决此问题?

最佳答案

尝试这个

Parameters camParams = camera.getParameters();
int size = imageWidth * imageHeight;
size  = size * ImageFormat.getBitsPerPixel(camParams.getPreviewFormat()) / 8;
mBuffer = new byte[size]; // class variable
camera.addCallbackBuffer(mBuffer);

10-06 09:01