[FFmpeg-devel] [PATCH v3] avcodec/libvpxenc: add a way to set VP9E_SET_SVC_REF_FRAME_CONFIG

Wonkap Jang wonkap at google.com
Tue Dec 15 19:24:14 EET 2020


Hi James

On Tue, Dec 15, 2020 at 9:18 AM Wonkap Jang <wonkap at google.com> wrote:

> In order to fine-control referencing schemes in VP9 encoding, there
> is a need to use VP9E_SET_SVC_REF_FRAME_CONFIG method. This commit
> provides a way to use the API through frame metadata.
> ---
>  doc/encoders.texi      | 32 +++++++++++++++++
>  libavcodec/libvpxenc.c | 81 ++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 113 insertions(+)
>
> diff --git a/doc/encoders.texi b/doc/encoders.texi
> index 0b1c69e982..2a10bc0608 100644
> --- a/doc/encoders.texi
> +++ b/doc/encoders.texi
> @@ -2129,6 +2129,38 @@ midpoint is passed in rather than calculated for a
> specific clip or chunk.
>  The valid range is [0, 10000]. 0 (default) uses standard VBR.
>  @item enable-tpl @var{boolean}
>  Enable temporal dependency model.
> + at item ref-frame-config
> +Using per-frame metadata, set members of the structure
> @code{vpx_svc_ref_frame_config_t} in @code{vpx/vp8cx.h} to fine-control
> referencing schemes and frame buffer management.
> +@*Use a :-separated list of key=value pairs.
> +For example,
> + at example
> +av_dict_set(&av_frame->metadata, "ref-frame-config", \
>
> +"rfc_update_buffer_slot=7:rfc_lst_fb_idx=0:rfc_gld_fb_idx=1:rfc_alt_fb_idx=2:rfc_reference_last=0:rfc_reference_golden=0:rfc_reference_alt_ref=0");}
> + at end example
> + at table @option
> + at item rfc_update_buffer_slot
> +Indicates the buffer slot number to update
> + at item rfc_update_last
> +Indicates whether to update the LAST frame
> + at item rfc_update_golden
> +Indicates whether to update GOLDEN frame
> + at item rfc_update_alt_ref
> +Indicates whether to update ALT_REF frame
> + at item rfc_lst_fb_idx
> +LAST frame buffer index
> + at item rfc_gld_fb_idx
> +GOLDEN frame buffer index
> + at item rfc_alt_fb_idx
> +ALT_REF frame buffer index
> + at item rfc_reference_last
> +Indicates whetehr to reference LAST frame
> + at item rfc_reference_golden
> +Indicates whether to reference GOLDEN frame
> + at item rfc_reference_alt_ref
> +Indicates whether to reference ALT_REF frame
> + at item rfc_reference_duration
> +Indicates frame duration
> + at end table
>  @end table
>
>  @end table
> diff --git a/libavcodec/libvpxenc.c b/libavcodec/libvpxenc.c
> index a7c76eb835..4943a9e32c 100644
> --- a/libavcodec/libvpxenc.c
> +++ b/libavcodec/libvpxenc.c
> @@ -125,6 +125,10 @@ typedef struct VPxEncoderContext {
>       * encounter a frame with ROI side data.
>       */
>      int roi_warned;
> +#if CONFIG_LIBVPX_VP9_ENCODER && defined
> (VPX_CTRL_VP9E_SET_MAX_INTER_BITRATE_PCT)
> +    vpx_svc_ref_frame_config_t ref_frame_config;
> +    AVDictionary *vpx_ref_frame_config;
> +#endif
>  } VPxContext;
>
>  /** String mappings for enum vp8e_enc_control_id */
> @@ -152,6 +156,7 @@ static const char *const ctlidstr[] = {
>      [VP9E_SET_SVC_LAYER_ID]            = "VP9E_SET_SVC_LAYER_ID",
>  #if VPX_ENCODER_ABI_VERSION >= 12
>      [VP9E_SET_SVC_PARAMETERS]          = "VP9E_SET_SVC_PARAMETERS",
> +    [VP9E_SET_SVC_REF_FRAME_CONFIG]    = "VP9E_SET_SVC_REF_FRAME_CONFIG",
>  #endif
>      [VP9E_SET_SVC]                     = "VP9E_SET_SVC",
>  #if VPX_ENCODER_ABI_VERSION >= 11
> @@ -394,6 +399,21 @@ static void vp8_ts_parse_int_array(int *dest, char
> *value, size_t value_len, int
>      }
>  }
>
> +#if CONFIG_LIBVPX_VP9_ENCODER && defined
> (VPX_CTRL_VP9E_SET_MAX_INTER_BITRATE_PCT)
> +static void vp8_ts_parse_int64_array(int64_t *dest, char *value, size_t
> value_len, int max_entries)
> +{
> +    int dest_idx = 0;
> +    char *saveptr = NULL;
> +    char *token = av_strtok(value, ",", &saveptr);
> +
> +    while (token && dest_idx < max_entries) {
> +        dest[dest_idx++] = strtoul(token, NULL, 10);
> +        token = av_strtok(NULL, ",", &saveptr);
> +    }
> +}
> +
> +#endif
> +
>  static void set_temporal_layer_pattern(int layering_mode,
> vpx_codec_enc_cfg_t *cfg,
>                                         int *layer_flags, int
> *flag_periodicity)
>  {
> @@ -541,6 +561,49 @@ static int vpx_ts_param_parse(VPxContext *ctx, struct
> vpx_codec_enc_cfg *enccfg,
>      return 0;
>  }
>
> +#if CONFIG_LIBVPX_VP9_ENCODER && defined
> (VPX_CTRL_VP9E_SET_MAX_INTER_BITRATE_PCT)
> +static int vpx_ref_frame_config_parse(VPxContext *ctx, const struct
> vpx_codec_enc_cfg *enccfg,
> +                              char *key, char *value, enum AVCodecID
> codec_id)
> +{
> +    size_t value_len = strlen(value);
> +    int ss_number_layers = enccfg->ss_number_layers;
> +    vpx_svc_ref_frame_config_t *ref_frame_config = &ctx->ref_frame_config;
> +
> +    if (!value_len)
> +        return -1;
> +
> +    if (codec_id != AV_CODEC_ID_VP9)
> +        return -1;
> +
> +    if (!strcmp(key, "rfc_update_buffer_slot")) {
> +        vp8_ts_parse_int_array(ref_frame_config->update_buffer_slot,
> value, value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_update_last")) {
> +        vp8_ts_parse_int_array(ref_frame_config->update_last, value,
> value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_update_golden")) {
> +        vp8_ts_parse_int_array(ref_frame_config->update_golden, value,
> value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_update_alt_ref")) {
> +        vp8_ts_parse_int_array(ref_frame_config->update_alt_ref, value,
> value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_lst_fb_idx")) {
> +        vp8_ts_parse_int_array(ref_frame_config->lst_fb_idx, value,
> value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_gld_fb_idx")) {
> +        vp8_ts_parse_int_array(ref_frame_config->gld_fb_idx, value,
> value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_alt_fb_idx")) {
> +        vp8_ts_parse_int_array(ref_frame_config->alt_fb_idx, value,
> value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_reference_last")) {
> +        vp8_ts_parse_int_array(ref_frame_config->reference_last, value,
> value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_reference_golden")) {
> +        vp8_ts_parse_int_array(ref_frame_config->reference_golden, value,
> value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_reference_alt_ref")) {
> +        vp8_ts_parse_int_array(ref_frame_config->reference_alt_ref,
> value, value_len, ss_number_layers);
> +    } else if (!strcmp(key, "rfc_reference_duration")) {
> +        vp8_ts_parse_int64_array(ref_frame_config->duration, value,
> value_len, ss_number_layers);
> +    }
> +
> +    return 0;
> +}
> +#endif
> +
> +
>  #if CONFIG_LIBVPX_VP9_ENCODER
>  static int set_pix_fmt(AVCodecContext *avctx, vpx_codec_caps_t codec_caps,
>                         struct vpx_codec_enc_cfg *enccfg,
> vpx_codec_flags_t *flags,
> @@ -1528,6 +1591,24 @@ static int vpx_encode(AVCodecContext *avctx,
> AVPacket *pkt,
>  #endif
>                  layer_id_valid = 1;
>              }
> +#if CONFIG_LIBVPX_VP9_ENCODER && defined
> (VPX_CTRL_VP9E_SET_MAX_INTER_BITRATE_PCT)
> +            en = av_dict_get(frame->metadata, "ref-frame-config", NULL,
> 0);
> +
> +            if (en) {
> +                AVDictionaryEntry* en2 = NULL;
> +                av_dict_parse_string(&ctx->vpx_ref_frame_config,
> en->value, "=", ":", 0);
> +
> +                while ((en2 = av_dict_get(ctx->vpx_ref_frame_config, "",
> en2, AV_DICT_IGNORE_SUFFIX))) {
> +                    if (vpx_ref_frame_config_parse(ctx, enccfg, en2->key,
> en2->value, avctx->codec_id) < 0)
> +                        av_log(avctx, AV_LOG_WARNING,
> +                               "Error parsing option '%s = %s'.\n",
> +                               en2->key, en2->value);
> +                }
> +
> +                codecctl_intp(avctx, VP9E_SET_SVC_REF_FRAME_CONFIG, (int
> *)&ctx->ref_frame_config);
> +            }
> +#endif
> +
>          }
>
>          if (sd) {
> --
> 2.29.2.684.gfbc64c5ab5-goog
>
> In reply to your comment about using ABI_VERSION for guarding the changes,
the reason I used the unrelated   "VPX_CTRL_VP9E_SET_MAX_INTER_BITRATE_PCT"
is because the ABI_VERION did not seem to have changed between the last
commit that you suggested (v1.7.0-936-g04b3d49ba) to use and the
lateset libvpx version. Can you confirm this?

Thank you,

Wonkap


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