LIVE555如何使用h264成帧器类为ffmpeg获取nal单元

#include <liveMedia/liveMedia.hh>
#include <BasicUsageEnvironment/BasicUsageEnvironment.hh>
#include <Groupsock/GroupsockHelper.hh>
extern "C" {
#include <libavcodec/avcodec.h>
}

H264VideoStreamFramer* videoFramer = H264VideoStreamFramer::createNew(*env);

FramedSource* videoSource = yourVideoSourceCreationFunction(*env);

videoFramer->addSource(videoSource);

H264VideoRTPSink* videoSink = H264VideoRTPSink::createNew(*env, yourRtpGroupsock);

videoFramer->addSink(videoSink, yourRtpPayloadType);

AVCodec* codec = avcodec_find_decoder(AV_CODEC_ID_H264);
AVCodecContext* codecContext = avcodec_alloc_context3(codec);
// 设置解码器参数
// ...
AVPacket packet;
av_init_packet(&packet);
// ...
AVFrame* frame = av_frame_alloc();
// ...
AVFormatContext* formatContext = avformat_alloc_context();
// 设置输出文件或其他目标
// ...

while (true) {
    // 从videoSink获取RTP包
    // ...
    // 将RTP包转换为NAL单元
    // ...
    // 使用FFmpeg进行解码和处理
    // ...
}

av_frame_free(&frame);
avcodec_free_context(&codecContext);
avformat_free_context(formatContext);