[FFmpeg-devel] [PATCH 2/3] avcodec/libuavs3d: use output_reorder_delay as has_b_frames

[FFmpeg-devel] [PATCH 2/3] avcodec/libuavs3d: use output_reorder_delay as has_b_frames

[Zhao Zhili]

has_b_frames is more than a bool, it's the size of the frame
reordering buffer in the decoder.
---
 libavcodec/libuavs3d.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/libuavs3d.c b/libavcodec/libuavs3d.c
index 23de4c8cd5..e911963a41 100644
--- a/libavcodec/libuavs3d.c
+++ b/libavcodec/libuavs3d.c
@@ -206,7 +206,7 @@ static int libuavs3d_decode_frame(AVCodecContext *avctx, AVFrame *frm,
                     avctx->framerate.num = ff_avs3_frame_rate_tab[seqh->frame_rate_code].num;
                     avctx->framerate.den = ff_avs3_frame_rate_tab[seqh->frame_rate_code].den;
                 }
-                avctx->has_b_frames  = !seqh->low_delay;
+                avctx->has_b_frames = seqh->output_reorder_delay;
                 avctx->pix_fmt = seqh->bit_depth_internal == 8 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUV420P10LE;
                 ret = ff_set_dimensions(avctx, seqh->horizontal_size, seqh->vertical_size);
                 if (ret < 0)
-- 
2.35.3


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[FFmpeg-devel] [PATCH 3/3] avcodec/libdavs2: export has_b_frames info

[Zhao Zhili]

More precisely, we should use picture_reorder_delay, but it's
unavailable yet.
---
 libavcodec/libdavs2.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/libdavs2.c b/libavcodec/libdavs2.c
index a47027d300..bc31745a4f 100644
--- a/libavcodec/libdavs2.c
+++ b/libavcodec/libdavs2.c
@@ -78,6 +78,12 @@ static int davs2_dump_frames(AVCodecContext *avctx, davs2_picture_t *pic, int *g
         avctx->height    = headerset->height;
         avctx->pix_fmt   = headerset->output_bit_depth == 10 ?
                            AV_PIX_FMT_YUV420P10 : AV_PIX_FMT_YUV420P;
+        /* It should be picture_reorder_delay, but libdavs2 doesn't export that
+         * info.
+         * Use FFMAX since has_b_frames could be set by AVS2 parser in theory,
+         * which doesn't do it yet.
+         */
+        avctx->has_b_frames = FFMAX(avctx->has_b_frames, !headerset->low_delay);
 
         avctx->framerate = av_d2q(headerset->frame_rate,4096);
         *got_frame = 0;
-- 
2.35.3

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Re: [FFmpeg-devel] [PATCH 2/3] avcodec/libuavs3d: use output_reorder_delay as has_b_frames

[mypopy]

On Fri, May 13, 2022 at 5:41 PM Zhao Zhili <quinkblack@foxmail.com> wrote:
>
> has_b_frames is more than a bool, it's the size of the frame
> reordering buffer in the decoder.
> ---
>  libavcodec/libuavs3d.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavcodec/libuavs3d.c b/libavcodec/libuavs3d.c
> index 23de4c8cd5..e911963a41 100644
> --- a/libavcodec/libuavs3d.c
> +++ b/libavcodec/libuavs3d.c
> @@ -206,7 +206,7 @@ static int libuavs3d_decode_frame(AVCodecContext *avctx, AVFrame *frm,
>                      avctx->framerate.num = ff_avs3_frame_rate_tab[seqh->frame_rate_code].num;
>                      avctx->framerate.den = ff_avs3_frame_rate_tab[seqh->frame_rate_code].den;
>                  }
> -                avctx->has_b_frames  = !seqh->low_delay;
> +                avctx->has_b_frames = seqh->output_reorder_delay;
The same case, AVS3 uses output_reorder_delay but AVS2 uses low_delay,
which is a bit strange
>                  avctx->pix_fmt = seqh->bit_depth_internal == 8 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUV420P10LE;
>                  ret = ff_set_dimensions(avctx, seqh->horizontal_size, seqh->vertical_size);
>                  if (ret < 0)
> --
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Re: [FFmpeg-devel] [PATCH 2/3] avcodec/libuavs3d: use output_reorder_delay as has_b_frames

["zhilizhao(赵志立)"]

> On May 14, 2022, at 9:04 AM, mypopy@gmail.com wrote:
> 
> On Fri, May 13, 2022 at 5:41 PM Zhao Zhili <quinkblack@foxmail.com> wrote:
>> 
>> has_b_frames is more than a bool, it's the size of the frame
>> reordering buffer in the decoder.
>> ---
>> libavcodec/libuavs3d.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/libavcodec/libuavs3d.c b/libavcodec/libuavs3d.c
>> index 23de4c8cd5..e911963a41 100644
>> --- a/libavcodec/libuavs3d.c
>> +++ b/libavcodec/libuavs3d.c
>> @@ -206,7 +206,7 @@ static int libuavs3d_decode_frame(AVCodecContext *avctx, AVFrame *frm,
>>                     avctx->framerate.num = ff_avs3_frame_rate_tab[seqh->frame_rate_code].num;
>>                     avctx->framerate.den = ff_avs3_frame_rate_tab[seqh->frame_rate_code].den;
>>                 }
>> -                avctx->has_b_frames  = !seqh->low_delay;
>> +                avctx->has_b_frames = seqh->output_reorder_delay;
> The same case, AVS3 uses output_reorder_delay but AVS2 uses low_delay,
> which is a bit strange

Patch 3/3 explains why: it should be picture_reorder_delay, but it’s
not available in libdavs2’s public API.

>>                 avctx->pix_fmt = seqh->bit_depth_internal == 8 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUV420P10LE;
>>                 ret = ff_set_dimensions(avctx, seqh->horizontal_size, seqh->vertical_size);
>>                 if (ret < 0)
>> --

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