在缩放时翻转AVFrame

Question

我从网络摄像头垂直翻转帧，我需要在同一步骤调整大小时翻转它们。 有人可以给我一个例子。这是我的代码

AVFrame* inpic = av_frame_alloc();
avpicture_fill((AVPicture*)inpic,
    m_CurrentFrame.bits(),
    AV_PIX_FMT_RGB32,
    m_CurrentFrame.width(),
    m_CurrentFrame.height());

AVFrame* m_resizedFrame = av_frame_alloc();
int num_bytes = avpicture_get_size(AV_PIX_FMT_YUV420P, m_szFrameSize.width(), m_szFrameSize.height());
uint8_t *m_resizedFrame_buffer = (uint8_t *)av_malloc(num_bytes*sizeof(uint8_t));

avpicture_fill((AVPicture*)m_resizedFrame, m_resizedFrame_buffer, 
AV_PIX_FMT_YUV420P, m_szFrameSize.width(), m_szFrameSize.height());

SwsContext *resize = sws_getContext(m_CurrentFrame.width(),
m_CurrentFrame.height(), 
AV_PIX_FMT_RGB32, 
m_szFrameSize.width(), 
m_szFrameSize.height(), 
AV_PIX_FMT_YUV420P, 
SWS_BICUBIC, NULL, NULL, NULL);

sws_scale(resize, inpic->data, inpic->linesize, 0, 
m_CurrentFrame.height(), 
m_resizedFrame->data, 
m_resizedFrame->linesize);

//Do work with resized frame...

感谢。