Ping. Any comments on the idea?
> On May 18, 2023, at 05:23, Zhao Zhili <quinkbl...@foxmail.com> wrote:
>
> From: Zhao Zhili <zhiliz...@tencent.com>
>
> ---
> libavcodec/cbs.c | 21 +++++++++++++++++++++
> libavcodec/cbs.h | 17 +++++++++++++++++
> libavcodec/cbs_internal.h | 6 ++++++
> 3 files changed, 44 insertions(+)
>
> diff --git a/libavcodec/cbs.c b/libavcodec/cbs.c
> index 504197e06d..cf5211249b 100644
> --- a/libavcodec/cbs.c
> +++ b/libavcodec/cbs.c
> @@ -1026,3 +1026,24 @@ int ff_cbs_make_unit_writable(CodedBitstreamContext
> *ctx,
> av_buffer_unref(&ref);
> return 0;
> }
> +
> +void ff_cbs_discard_units(CodedBitstreamContext *ctx,
> + CodedBitstreamFragment *frag,
> + enum AVDiscard skip,
> + int flags)
> +{
> + if (!ctx->codec->discarded_unit)
> + return;
> +
> + for (int i = frag->nb_units - 1; i >= 0; i--) {
> + if (ctx->codec->discarded_unit(ctx, &frag->units[i], skip)) {
> + // discard all units
> + if (!(flags & DISCARD_FLAG_KEEP_NON_VCL)) {
> + ff_cbs_fragment_free(frag);
> + return;
> + }
> +
> + ff_cbs_delete_unit(frag, i);
> + }
> + }
> +}
> diff --git a/libavcodec/cbs.h b/libavcodec/cbs.h
> index ee21623dac..b4131db5fe 100644
> --- a/libavcodec/cbs.h
> +++ b/libavcodec/cbs.h
> @@ -26,6 +26,7 @@
>
> #include "codec_id.h"
> #include "codec_par.h"
> +#include "defs.h"
> #include "packet.h"
>
>
> @@ -432,5 +433,21 @@ int ff_cbs_make_unit_refcounted(CodedBitstreamContext
> *ctx,
> int ff_cbs_make_unit_writable(CodedBitstreamContext *ctx,
> CodedBitstreamUnit *unit);
>
> +enum CbsDiscardFlags {
> + DISCARD_FLAG_NONE = 0,
> +
> + /**
> + * keep non-vcl units even if the picture has been dropped.
> + */
> + DISCARD_FLAG_KEEP_NON_VCL = 0x01,
> +};
> +
> +/**
> + * Discard units accroding to 'skip'.
> + */
> +void ff_cbs_discard_units(CodedBitstreamContext *ctx,
> + CodedBitstreamFragment *frag,
> + enum AVDiscard skip,
> + int flags);
>
> #endif /* AVCODEC_CBS_H */
> diff --git a/libavcodec/cbs_internal.h b/libavcodec/cbs_internal.h
> index e585c77934..077954eee5 100644
> --- a/libavcodec/cbs_internal.h
> +++ b/libavcodec/cbs_internal.h
> @@ -133,6 +133,12 @@ typedef struct CodedBitstreamType {
> CodedBitstreamUnit *unit,
> PutBitContext *pbc);
>
> + // Return 1 when the unit should be dropped according to 'skip',
> + // 0 otherwise.
> + int (*discarded_unit)(CodedBitstreamContext *ctx,
> + const CodedBitstreamUnit *unit,
> + enum AVDiscard skip);
> +
> // Read the data from all of frag->units and assemble it into
> // a bitstream for the whole fragment.
> int (*assemble_fragment)(CodedBitstreamContext *ctx,
> --
> 2.25.1
>
>
>
>
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