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import com.xuggle.mediatool.IMediaReader;
import com.xuggle.mediatool.IMediaWriter;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.xuggler.ICodec;
import com.xuggle.xuggler.IContainer;
import com.xuggle.xuggler.IStream;
import com.xuggle.xuggler.IStreamCoder;

public class VideoCompressor {

    public static void main(String[] args) {
        if (args.length != 3) {
            System.err.println("用法: java VideoCompressor <输入文件> <输出文件> <目标比特率(kbps)>");
            System.exit(1);
        }

        String inputFile = args[0];
        String outputFile = args[1];
        int targetBitrate = Integer.parseInt(args[2]) * 1000; // 转换为bps

        try {
            compressVideo(inputFile, outputFile, targetBitrate);
            System.out.println("视频压缩完成: " + outputFile);
        } catch (Exception e) {
            System.err.println("压缩过程中发生错误: " + e.getMessage());
            e.printStackTrace();
        }
    }

    public static void compressVideo(String inputFilePath, String outputFilePath, int targetBitrate) {
        // 创建媒体读取器
        IMediaReader reader = ToolFactory.makeReader(inputFilePath);

        // 创建媒体写入器
        IMediaWriter writer = ToolFactory.makeWriter(outputFilePath, reader);

        // 获取输入视频的容器信息
        IContainer inputContainer = IContainer.make();
        if (inputContainer.open(inputFilePath, IContainer.Type.READ, null) < 0) {
            throw new IllegalArgumentException("无法打开输入文件: " + inputFilePath);
        }

        // 查找视频流
        int videoStreamIndex = -1;
        IStreamCoder videoCoder = null;
        for (int i = 0; i < inputContainer.getNumStreams(); i++) {
            IStream stream = inputContainer.getStream(i);
            IStreamCoder coder = stream.getStreamCoder();

            if (coder.getCodecType() == ICodec.Type.CODEC_TYPE_VIDEO) {
                videoStreamIndex = i;
                videoCoder = coder;
                break;
            }
        }

        if (videoStreamIndex == -1) {
            throw new RuntimeException("未找到视频流");
        }

        // 打开编码器
        if (videoCoder.open() < 0) {
            throw new RuntimeException("无法打开视频编码器");
        }

        // 添加视频流到写入器，设置目标比特率
        writer.addVideoStream(0, 0, 
                ICodec.ID.CODEC_ID_H264,
                videoCoder.getWidth(), 
                videoCoder.getHeight());

        // 设置视频比特率
        writer.getContainer().getStream(0).getStreamCoder().setBitRate(targetBitrate);

        // 读取并处理视频帧
        while (reader.readPacket() == null) ;

        // 关闭资源
        writer.close();
        reader.close();
        videoCoder.close();
    }
}