Quoting Hendrik Leppkes (2016-12-18 21:37:44)
> On Sun, Dec 18, 2016 at 9:27 PM, Anton Khirnov <an...@khirnov.net> wrote:
> > ---
> > doc/APIchanges | 4 ++++
> > libavutil/frame.c | 2 ++
> > libavutil/frame.h | 14 ++++++++++++++
> > libavutil/version.h | 2 +-
> > 4 files changed, 21 insertions(+), 1 deletion(-)
> >
> > diff --git a/doc/APIchanges b/doc/APIchanges
> > index 7633c99..ca95308 100644
> > --- a/doc/APIchanges
> > +++ b/doc/APIchanges
> > @@ -13,6 +13,10 @@ libavutil: 2015-08-28
> >
> > API changes, most recent first:
> >
> > +2016-xx-xx - xxxxxxx - lavu 55.30.0 - frame.h
> > + Add AVFrame.crop_left/crop_top fields for attaching cropping information
> > to
> > + video frames.
> > +
> > 2016-xx-xx - xxxxxxx - lavc 57.29.0 - avcodec.h
> > Add AV_PKT_DATA_SPHERICAL packet side data to export AVSphericalMapping
> > information from containers.
> > diff --git a/libavutil/frame.c b/libavutil/frame.c
> > index 1c14f5f..935c281 100644
> > --- a/libavutil/frame.c
> > +++ b/libavutil/frame.c
> > @@ -390,6 +390,8 @@ int av_frame_copy_props(AVFrame *dst, const AVFrame
> > *src)
> > dst->key_frame = src->key_frame;
> > dst->pict_type = src->pict_type;
> > dst->sample_aspect_ratio = src->sample_aspect_ratio;
> > + dst->crop_left = src->crop_left;
> > + dst->crop_top = src->crop_top;
> > dst->pts = src->pts;
> > dst->repeat_pict = src->repeat_pict;
> > dst->interlaced_frame = src->interlaced_frame;
> > diff --git a/libavutil/frame.h b/libavutil/frame.h
> > index 4052199..744d8d2 100644
> > --- a/libavutil/frame.h
> > +++ b/libavutil/frame.h
> > @@ -25,6 +25,7 @@
> > #ifndef AVUTIL_FRAME_H
> > #define AVUTIL_FRAME_H
> >
> > +#include <stddef.h>
> > #include <stdint.h>
> >
> > #include "avutil.h"
> > @@ -369,6 +370,19 @@ typedef struct AVFrame {
> > * AVHWFramesContext describing the frame.
> > */
> > AVBufferRef *hw_frames_ctx;
> > +
> > + /**
> > + * Video frames only.
> > + * The number of pixels to discard from the left border of the frame to
> > + * obtain the part of the frame intended for presentation.
> > + */
> > + size_t crop_left;
> > + /**
> > + * Video frames only.
> > + * The number of pixels to discard from the top border of the frame to
> > + * obtain the part of the frame intended for presentation.
> > + */
> > + size_t crop_top;
>
> If you start exporting cropping info, it should imho be a full rect,
> so you can eg. export 1px crop for 4:2:0 formats and whatnot, and not
> be limited to one specific use-case.
Unless I'm missing something, you can certainly export 1 pixel cropping
here. It's up to the caller to interpret what that means.
--
Anton Khirnov
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