ffmpeg YUV420P视频帧旋转

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//逆时针旋转90 度-(void)frame_rotate_90WithSorrce:(AVFrame *)src des:(AVFrame*)des{    int n = 0;    int hw = src->width>>1;    int hh = src->height>>1;    int size = src->width * src->height;    int hsize = size>>2;    int pos = 0;    //copy y    for(int j = 0; j < src->width;j++)    {        pos = size;        for(int i = src->height - 1; i >= 0; i--)        {   pos-=src->width;            des->data[0][n++] = src->data[0][pos + j];        }    }    //copy uv    n = 0;    for(int j = 0;j < hw;j++)    {   pos= hsize;        for(int i = hh - 1;i >= 0;i--)        {            pos-=hw;            des->data[1][n] = src->data[1][ pos + j];            des->data[2][n] = src->data[2][ pos + j];            n++;        }    }    des->linesize[0] = src->height;    des->linesize[1] = src->height>>1;    des->linesize[2] = src->height>>1;    des->height = src->width;    des->width = src->height;}//逆时针旋转180度-(void)frame_rotate_180WithSorrce:(AVFrame *)src des:(AVFrame*)des{    int n = 0,i= 0,j = 0;    int hw = src->width>>1;    int hh = src->height>>1;    int pos= src->width * src->height;    for (i = 0; i < src->height; i++)    {        pos-= src->width;        for (int j = 0; j < src->width; j++) {            des->data[0][n++] = src->data[0][pos + j];        }    }    n = 0;    pos = src->width * src->height>>2;    for (i = 0; i < hh;i++) {        pos-= hw;        for (int j = 0; j < hw;j++) {            des->data[1][n] = src->data[1][ pos + j];            des->data[2][n] = src->data[2][ pos + j];            n++;        }    }    des->linesize[0] = src->width;    des->linesize[1] = src->width>>1;    des->linesize[2] = src->width>>1;    des->width = src->width;    des->height = src->height;    des->format = src->format;    des->pts = src->pts;    des->pkt_pts = src->pkt_pts;    des->pkt_dts = src->pkt_dts;    des->key_frame = src->key_frame;}//逆时针旋转270度-(void)frame_rotate_270WithSorrce:(AVFrame *)src des:(AVFrame*)des{    int n = 0,i= 0,j = 0;    int hw = src->width>>1;    int hh = src->height>>1;    int pos = 0;    for(i = src->width-1;i >= 0;i--)    {        pos = 0;        for(j= 0;j < src->height;j++)        {            des->data[0][n++]= src->data[0][pos+i];            pos += src->width;        }    }    n = 0;    for (i = hw-1; i >= 0;i--) {        pos= 0;        for (j = 0; j < hh;j++) {            des->data[1][n]= src->data[1][pos+i];            des->data[2][n]= src->data[2][pos+i];            pos += hw;            n++;        }    }    des->linesize[0] = src->height;    des->linesize[1] = src->height>>1;    des->linesize[2] = src->height>>1;    des->width = src->height;    des->height = src->width;    des->format = src->format;    des->pts = src->pts;    des->pkt_pts = src->pkt_pts;    des->pkt_dts = src->pkt_dts;    des->key_frame = src->key_frame;}
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