[FFmpeg-devel] [PATCH v2] 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.
Wonkap Jang
wonkap at google.com
Mon Dec 14 21:54:31 EET 2020
On Mon, Dec 7, 2020 at 11:57 PM Wonkap Jang <wonkap at google.com> wrote:
> ---
> doc/encoders.texi | 32 +++++++++++++++++
> libavcodec/libvpxenc.c | 79 ++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 111 insertions(+)
>
> diff --git a/doc/encoders.texi b/doc/encoders.texi
> index 0b1c69e982..aa3a2221b6 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..345c71cd22 100644
> --- a/libavcodec/libvpxenc.c
> +++ b/libavcodec/libvpxenc.c
> @@ -125,6 +125,11 @@ 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 +157,9 @@ 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",
> +#if defined (VPX_CTRL_VP9E_SET_MAX_INTER_BITRATE_PCT)
> + [VP9E_SET_SVC_REF_FRAME_CONFIG] = "VP9E_SET_SVC_REF_FRAME_CONFIG",
> +#endif
> #endif
> [VP9E_SET_SVC] = "VP9E_SET_SVC",
> #if VPX_ENCODER_ABI_VERSION >= 11
> @@ -394,6 +402,18 @@ static void vp8_ts_parse_int_array(int *dest, char
> *value, size_t value_len, int
> }
> }
>
> +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++] = strtoull(token, NULL, 10);
> + token = av_strtok(NULL, ",", &saveptr);
> + }
> +}
> +
> static void set_temporal_layer_pattern(int layering_mode,
> vpx_codec_enc_cfg_t *cfg,
> int *layer_flags, int
> *flag_periodicity)
> {
> @@ -541,6 +561,48 @@ 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 +1590,23 @@ 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) {
> --
> 2.29.2.576.ga3fc446d84-goog
>
> Hi James,
Could you take a look at the changes?
Thanks!!
Wonkap
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