Android 4.0 UnpupportedOperationException about javacpp

[saudet]

Looks like a bug in Android 4.0: https://code.google.com/p/android/issues/detail?id=24327

So if you cannot update to 4.1 at least, it looks like the workaround is to recreate the buffers you are using, in Java.

[szitguy]

@aydinkn I get the same problem. Do you use FFmpegFrameFilter?
On Android4.0.4, I removed FFmpegFrameFilter process code, and it worked, but certainly no more crop process.

[aydinkn]

@szitguy my application need FFmpegFrameFilter (for transpose). I changed application min android version to >= 4.1 for now.

[szitguy]

@aydinkn OK, but my app still want to support from Android4.0.
I am trying to find some way to fix it.

[szitguy]

@aydinkn I fixed the problem just now, i modified the "pull" method of class FFmpegFrameFilter, here is my "pull" code(look at the line writing "if (SystemVersionUtil.hasJellyBean())"):

public Frame pull() throws Exception {
    av_frame_unref(filt_frame);

    /* pull a filtered frame from the filtergraph */
    int ret = av_buffersink_get_frame(buffersink_ctx, filt_frame);
    if (ret == -11 /*AVERROR(EAGAIN)*/ || ret == AVERROR_EOF) {
        return null;
    } else if (ret < 0) {
        throw new Exception("av_buffersink_get_frame(): Error occurred: "
                + av_make_error_string(new BytePointer(256), 256, ret).getString());
    }
    frame.imageWidth  = filt_frame.width();
    frame.imageHeight = filt_frame.height();
    frame.imageDepth = Frame.DEPTH_UBYTE;
    if (filt_frame.data(1) == null) {
        frame.imageStride = filt_frame.linesize(0);
        BytePointer ptr = filt_frame.data(0);
        if (ptr != null && !ptr.equals(image_ptr[0])) {
            image_ptr[0] = ptr.capacity(frame.imageHeight * frame.imageStride);
            image_buf[0] = ptr.asBuffer();
        }
        frame.image = image_buf;
        frame.image[0].position(0).limit(frame.imageHeight * frame.imageStride);
        frame.imageChannels = frame.imageStride / frame.imageWidth;
    } else {
        frame.imageStride = frame.imageWidth;
        int size = avpicture_get_size(filt_frame.format(), frame.imageWidth, frame.imageHeight);
        // Fix bug on Android4.0，check out https://github.com/bytedeco/javacpp/issues/39
        if (SystemVersionUtil.hasJellyBean()) {
            if (image_ptr[0] == null || image_ptr[0].capacity() < size) {
                image_ptr[0] = new BytePointer(size);
                image_buf[0] = image_ptr[0].asBuffer();
            }
            frame.image = image_buf;
            frame.image[0].position(0).limit(size);
            frame.imageChannels = 2;
            ret = avpicture_layout(new AVPicture(filt_frame), filt_frame.format(),
                    frame.imageWidth, frame.imageHeight, image_ptr[0].position(0), image_ptr[0].capacity());
        } else {
            if (image_buf[0] == null || image_buf[0].capacity() < size) {
                image_buf[0] = ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder());
            }
            frame.image = image_buf;
            frame.image[0].position(0).limit(size);
            frame.imageChannels = 2;
            ret = avpicture_layout(new AVPicture(filt_frame), filt_frame.format(),
                    frame.imageWidth, frame.imageHeight, (ByteBuffer) frame.image[0].position(0), frame.image[0].capacity());
        }
    }
    return frame;
}

[saudet]

@szitguy Your fix looks to me, no need to keep the old code around. So, remove the SystemVersionUtil.hasJellyBean() check that doesn't work on Java SE anyway, and send me a pull request. I'll merge that in, thanks!

[szitguy]

@saudet OK!