[Libav-user] linesizes

[MXWendler LibAV]

Hi All,

i had a look at AVPicture, and it is a tiny structure

typedef struct AVPicture {
     uint8_t *data[4];
     int linesize[4];       ///< number of bytes per line
} AVPicture;

For further image processing i need the linesize, but passing the full 
struct is unhandy, since it will be passed through various api layers ( 
opengl .. opencl .. ). It would help very much in my case since a short 
calculation takes less resources than passing multiple parameters around.

Is there a reliable way to derive the line size from eg. resolution and 
/ or pixel format? Like eg. PIX_FMT_YUV420P has three line entries 
(ycbcr), and the Y stride is XX and the cb/cr stride is half of that?


Thank you,
Horst