On Sat, 2022-11-19 at 00:20 -0800, Aman Karmani wrote:
> Thank you for your work on this patchset!
>
> On Sun, Oct 23, 2022 at 8:17 PM Zhao Zhili <quinkbl...@foxmail.com>
> wrote:
> > From: Zhao Zhili <zhiliz...@tencent.com>
> >
> > The crop info is optional, but used unconditionally.
> >
> > Signed-off-by: Zhao Zhili <zhiliz...@tencent.com>
> > ---
> > libavcodec/mediacodecdec_common.c | 5 +++++
> > 1 file changed, 5 insertions(+)
> >
> > diff --git a/libavcodec/mediacodecdec_common.c
> > b/libavcodec/mediacodecdec_common.c
> > index 2a605e7f5b..c1cbb28488 100644
> > --- a/libavcodec/mediacodecdec_common.c
> > +++ b/libavcodec/mediacodecdec_common.c
> > @@ -487,6 +487,11 @@ static int
> > mediacodec_dec_parse_format(AVCodecContext *avctx,
> > MediaCodecDecConte
> > AMEDIAFORMAT_GET_INT32(s->crop_left, "crop-left", 0);
> > AMEDIAFORMAT_GET_INT32(s->crop_right, "crop-right", 0);
> >
> > + if (s->crop_bottom == 0 || s->crop_right == 0) {
> > + s->crop_top = s->crop_left = 0;
> > + s->crop_right = s->width - 1;
> > + s->crop_bottom = s->height - 1;
> > + }
> > width = s->crop_right + 1 - s->crop_left;
> > height = s->crop_bottom + 1 - s->crop_top;
>
> I had another approach I have been using for some time. WDYT?
>
> http://github.com/tmm1/ffmpeg/commit/ebc0ef75d25e712278c34427ef2f7d42f3dcf883
I found the issue when testing NDK mediacodec. There is no 'crop-left',
'crop-right' and so on. However, there is a 'crop' field in AMediaForma
t, for example:
android._video-scaling: int32(1), crop: Rect(0, 0, 1919, 1079), color-
standard: int32(1), ...
Unfortunately, it's available only since API level 28:
------------------------------------------------
extern const char* AMEDIAFORMAT_KEY_DISPLAY_CROP __INTRODUCED_IN(28);
/**
* Available since API level 28.
*/
bool AMediaFormat_getRect(AMediaFormat*, const char *name,
int32_t *left, int32_t *top, int32_t *right, int32_t *bottom)
__INTRODUCED_IN(28);
-------------------------------------------------
So we need to add a new API in mediacodec_wrapper first, then extract
crop info. It's on my TODO list.
For your patch,
+ AMEDIAFORMAT_GET_INT32(width, "crop-width", 0);
+ AMEDIAFORMAT_GET_INT32(height, "crop-height", 0);
I can't find documention about these fields, and they didn't show on
Google Pixel 3. What's the device model? We can use it as a fallback,
after crop-left/crop-right and crop rect failed.
>
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