Re: [FFmpeg-devel] [PATCH 1/4] avcodec/cbs_h266: add support for Operating point information NALU type

[Nuo Mi]

On Mon, Jul 3, 2023 at 7:28 AM James Almer <jamr...@gmail.com> wrote:

> Signed-off-by: James Almer <jamr...@gmail.com>
> ---
>  libavcodec/cbs_h2645.c                | 18 ++++++++++++++++++
>  libavcodec/cbs_h266.h                 | 11 +++++++++++
>  libavcodec/cbs_h266_syntax_template.c | 27 +++++++++++++++++++++++++++
>  3 files changed, 56 insertions(+)
>
> diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c
> index 68ccf6a7eb..8dc9ae471d 100644
> --- a/libavcodec/cbs_h2645.c
> +++ b/libavcodec/cbs_h2645.c
> @@ -1059,6 +1059,14 @@ static int
> cbs_h266_read_nal_unit(CodedBitstreamContext *ctx,
>          return err;
>
>      switch (unit->type) {
> +    case VVC_OPI_NUT:
> +        {
> +            err = cbs_h266_read_opi(ctx, &gbc, unit->content);
> +
> +            if (err < 0)
> +                return err;
> +        }
> +        break;
>      case VVC_VPS_NUT:
>          {
>              H266RawVPS *vps = unit->content;
> @@ -1593,6 +1601,15 @@ static int
> cbs_h266_write_nal_unit(CodedBitstreamContext *ctx,
>      int err;
>
>      switch (unit->type) {
> +    case VVC_OPI_NUT:
> +        {
> +            H266RawOPI *opi = unit->content;
> +
> +            err = cbs_h266_write_opi(ctx, pbc, opi);
> +            if (err < 0)
> +                return err;
> +        }
> +        break;
>      case VVC_VPS_NUT:
>          {
>              H266RawVPS *vps = unit->content;
> @@ -1965,6 +1982,7 @@ static void cbs_h266_free_sei(void *opaque, uint8_t
> *content)
>  }
>
>  static const CodedBitstreamUnitTypeDescriptor cbs_h266_unit_types[] = {
> +    CBS_UNIT_TYPE_INTERNAL_REF(VVC_OPI_NUT, H266RawOPI,
> extension_data.data),
>      CBS_UNIT_TYPE_INTERNAL_REF(VVC_VPS_NUT, H266RawVPS,
> extension_data.data),
>      CBS_UNIT_TYPE_INTERNAL_REF(VVC_SPS_NUT, H266RawSPS,
> extension_data.data),
>      CBS_UNIT_TYPE_INTERNAL_REF(VVC_PPS_NUT, H266RawPPS,
> extension_data.data),
> diff --git a/libavcodec/cbs_h266.h b/libavcodec/cbs_h266.h
> index e33d08a0f5..693d1ca1fd 100644
> --- a/libavcodec/cbs_h266.h
> +++ b/libavcodec/cbs_h266.h
> @@ -230,6 +230,17 @@ typedef struct H266RawVUI {
>      H266RawExtensionData extension_data;
>  } H266RawVUI;
>
> +typedef struct H266RawOPI {
> +    H266RawNALUnitHeader nal_unit_header;
> +
> +    uint8_t opi_ols_info_present_flag;
> +    uint8_t opi_htid_info_present_flag;
> +    uint16_t opi_ols_idx;
> +    uint8_t opi_htid_plus1;
> +    uint8_t opi_extension_flag;
> +    H266RawExtensionData extension_data;
> +} H266RawOPI;
> +
>  typedef struct H266RawVPS {
>      H266RawNALUnitHeader nal_unit_header;
>
> diff --git a/libavcodec/cbs_h266_syntax_template.c
> b/libavcodec/cbs_h266_syntax_template.c
> index 957735056f..d9c8e0afbe 100644
> --- a/libavcodec/cbs_h266_syntax_template.c
> +++ b/libavcodec/cbs_h266_syntax_template.c
> @@ -623,6 +623,33 @@ static int FUNC(ols_timing_hrd_parameters)
> (CodedBitstreamContext *ctx,
>      return 0;
>  }
>
> +static int FUNC(opi)(CodedBitstreamContext *ctx, RWContext *rw,
> +                     H266RawOPI *current)
> +{
> +    int err;
> +
> +    HEADER("Operating point information");
> +
> +    CHECK(FUNC(nal_unit_header)(ctx, rw,
> +                                &current->nal_unit_header, VVC_OPI_NUT));
> +
> +    flag(opi_ols_info_present_flag);
> +    flag(opi_htid_info_present_flag);
> +
> +    if(current->opi_ols_info_present_flag)
> +        ue(opi_ols_idx, 0, VVC_MAX_TOTAL_NUM_OLSS - 1);
> +
> +    if(current->opi_htid_info_present_flag)
> +        ub(3, opi_htid_plus1);
> +
> +    flag(opi_extension_flag);
> +    if (current->opi_extension_flag)
> +        CHECK(FUNC(extension_data) (ctx, rw, &current->extension_data));
> +    CHECK(FUNC(rbsp_trailing_bits) (ctx, rw));
> +
> +    return 0;
> +}
> +
>  static int FUNC(vps) (CodedBitstreamContext *ctx, RWContext *rw,
>                       H266RawVPS *current)
>  {
> --
> 2.41.0
>
> LGTM

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