问FFmpeg内存泄漏

EN

int VideoGL::NextVideoFrame(){
int frameDone = 0;
int result = 0;
double pts = 0;

if(!this->ended){

if (!_started) return 0;
AVPacket* packet;

// Get the number of milliseconds passed and see if we should display a new frame
int64_t msPassed = (1000 * (clock() - _baseTime)) / CLOCKS_PER_SEC;
if (msPassed >= _currentPts)
{
    // If this is not the current frame, copy it to the buffer
    if (_currentFramePts != _currentPts){
        _currentFramePts = _currentPts;
        memcpy(buffer_a,buffer, 3 * _codec_context_video->width * _codec_context_video->height);
        result = 1;
    }

    // Try to load a new frame from the video packet queue
    bool goodop=false;
    AVFrame *_n_frame = avcodec_alloc_frame();
    while (!frameDone && (packet = this->DEQUEUE(VIDEO)) != NULL)
    {
        if (packet == (AVPacket*)-1) return -1;

        goodop=true;

        _s_pts = packet->pts;
        avcodec_decode_video2(_codec_context_video, _n_frame, &frameDone, packet);
        av_free_packet(packet);

        if (packet->dts == AV_NOPTS_VALUE)
        {
            if (_n_frame->opaque && *(uint64_t*)_n_frame->opaque != AV_NOPTS_VALUE) pts = (double) *(uint64_t*)_n_frame->opaque;
            else pts = 0;
        }
        else pts = (double) packet->dts;

        pts *= av_q2d(_codec_context_video->time_base);

    }

    if (frameDone)
    {
        // if a frame was loaded scale it to the current texture frame buffer, but also set the pts so that it won't be copied to the texture until it's time
        sws_scale(sws_ctx,_n_frame->data, _n_frame->linesize, 0, _codec_context_video->height, _rgb_frame->data, _rgb_frame->linesize);


        double nts = 1.0/av_q2d(_codec_context_video->time_base);
        _currentPts = (uint64_t) (pts*nts);

    }

    avcodec_free_frame(&_n_frame);
    av_free(_n_frame);

    if(!goodop){
        ended=true;
    }
}
}

return result;
}