Re: [FFmpeg-devel] [PATCH 1/2] avcodec/jpeg2000dec: Set sample aspect ratio before getting buffer

["Tomas Härdin" <tjoppen@acc.umu.se>]

fre 2022-09-23 klockan 17:40 +0200 skrev Andreas Rheinhardt:
> That way the SAR will be automatically set on the AVFrame.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
> If I am not mistaken, then the earlier code would set the sar
> with a delay of one frame on the returned frames in case
> there is a sar change mid-stream. But I don't have a sample
> for this.
> 
>  libavcodec/jpeg2000dec.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
> index 7d9661f29f..c3f2a7aa03 100644
> --- a/libavcodec/jpeg2000dec.c
> +++ b/libavcodec/jpeg2000dec.c
> @@ -2519,6 +2519,10 @@ static int
> jpeg2000_decode_frame(AVCodecContext *avctx, AVFrame *picture,
>      if (ret = jpeg2000_read_main_headers(s))
>          goto end;
>  
> +    if (s->sar.num && s->sar.den)
> +        avctx->sample_aspect_ratio = s->sar;
> +    s->sar.num = s->sar.den = 0;
> +
>      /* get picture buffer */
>      if ((ret = ff_thread_get_buffer(avctx, picture, 0)) < 0)
>          goto end;
> @@ -2547,9 +2551,6 @@ static int jpeg2000_decode_frame(AVCodecContext
> *avctx, AVFrame *picture,
>  
>      if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
>          memcpy(picture->data[1], s->palette, 256 *
> sizeof(uint32_t));
> -    if (s->sar.num && s->sar.den)
> -        avctx->sample_aspect_ratio = s->sar;
> -    s->sar.num = s->sar.den = 0;

I suspect not doing this is what caused my simple hack to not work when
ff_thread_get_buffer() was skipped. Looks OK, passes FATE.

/Tomas

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