[FFmpeg-devel] [PATCH v2 4/4] avcodec/hevcdec: apply AOM film grain synthesis

[Niklas Haas <ffmpeg@haasn.xyz>]

From: Niklas Haas <git@haasn.dev>

Following the usual logic for H.274 film grain.
---
 libavcodec/Makefile  |  2 +-
 libavcodec/hevcdec.c | 24 ++++++++++++++++++++----
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index d86b4018405..440179ac797 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -434,7 +434,7 @@ OBJS-$(CONFIG_HDR_ENCODER)             += hdrenc.o
 OBJS-$(CONFIG_HEVC_DECODER)            += hevcdec.o hevc_mvs.o \
                                           hevc_cabac.o hevc_refs.o hevcpred.o    \
                                           hevcdsp.o hevc_filter.o hevc_data.o \
-                                          h274.o
+                                          h274.o aom_film_grain.o
 OBJS-$(CONFIG_HEVC_AMF_ENCODER)        += amfenc_hevc.o
 OBJS-$(CONFIG_HEVC_CUVID_DECODER)      += cuviddec.o
 OBJS-$(CONFIG_HEVC_MEDIACODEC_DECODER) += mediacodecdec.o
diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index b5311ae510e..27f5c7426a5 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -35,6 +35,7 @@
 #include "libavutil/pixdesc.h"
 #include "libavutil/timecode.h"
 
+#include "aom_film_grain.h"
 #include "bswapdsp.h"
 #include "cabac_functions.h"
 #include "codec_internal.h"
@@ -388,7 +389,8 @@ static int export_stream_params_from_sei(HEVCContext *s)
         avctx->color_trc = s->sei.common.alternative_transfer.preferred_transfer_characteristics;
     }
 
-    if (s->sei.common.film_grain_characteristics.present)
+    if (s->sei.common.film_grain_characteristics.present ||
+        s->sei.common.aom_film_grain.enable)
         avctx->properties |= FF_CODEC_PROPERTY_FILM_GRAIN;
 
     return 0;
@@ -2883,11 +2885,13 @@ static int hevc_frame_start(HEVCContext *s)
     else
         s->ref->frame->flags &= ~AV_FRAME_FLAG_KEY;
 
-    s->ref->needs_fg = s->sei.common.film_grain_characteristics.present &&
+    s->ref->needs_fg = (s->sei.common.film_grain_characteristics.present ||
+                        s->sei.common.aom_film_grain.enable) &&
         !(s->avctx->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN) &&
         !s->avctx->hwaccel;
 
     if (s->ref->needs_fg &&
+        s->sei.common.film_grain_characteristics.present &&
         !ff_h274_film_grain_params_supported(s->sei.common.film_grain_characteristics.model_id,
                                              s->ref->frame->format)) {
         av_log_once(s->avctx, AV_LOG_WARNING, AV_LOG_DEBUG, &s->film_grain_warning_shown,
@@ -2933,13 +2937,24 @@ static int hevc_frame_end(HEVCContext *s)
 {
     HEVCFrame *out = s->ref;
     const AVFrameSideData *sd;
+    const AVFilmGrainParams *fgp;
     av_unused int ret;
 
     if (out->needs_fg) {
         sd = av_frame_get_side_data(out->frame, AV_FRAME_DATA_FILM_GRAIN_PARAMS);
         av_assert0(out->frame_grain->buf[0] && sd);
-        ret = ff_h274_apply_film_grain(out->frame_grain, out->frame, &s->h274db,
-                                       (AVFilmGrainParams *) sd->data);
+        fgp = (AVFilmGrainParams *) sd->data;
+        switch (fgp->type) {
+        case AV_FILM_GRAIN_PARAMS_NONE:
+            return AVERROR_BUG; /* impossible, SD should not be present */
+        case AV_FILM_GRAIN_PARAMS_H274:
+            ret = ff_h274_apply_film_grain(out->frame_grain, out->frame,
+                                           &s->h274db, fgp);
+            break;
+        case AV_FILM_GRAIN_PARAMS_AV1:
+            ret = ff_aom_apply_film_grain(out->frame_grain, out->frame, fgp);
+            break;
+        }
         av_assert1(ret >= 0);
     }
 
@@ -3594,6 +3609,7 @@ static int hevc_update_thread_context(AVCodecContext *dst,
     s->sei.common.alternative_transfer = s0->sei.common.alternative_transfer;
     s->sei.common.mastering_display    = s0->sei.common.mastering_display;
     s->sei.common.content_light        = s0->sei.common.content_light;
+    s->sei.common.aom_film_grain       = s0->sei.common.aom_film_grain;
 
     ret = export_stream_params_from_sei(s);
     if (ret < 0)
-- 
2.43.2

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