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From: toqsxw@gmail.com
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To: ffmpeg-devel@ffmpeg.org
Date: Wed, 2 Apr 2025 01:16:00 +0800
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Subject: [FFmpeg-devel] [PATCH v1 03/19] avcodec/vvc/sei: add
decode_film_grain_characteristics
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From: Wu Jianhua <toqsxw@outlook.com>
Signed-off-by: Wu Jianhua <toqsxw@outlook.com>
---
libavcodec/vvc/sei.c | 66 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
diff --git a/libavcodec/vvc/sei.c b/libavcodec/vvc/sei.c
index 2842862a36..365f815950 100644
--- a/libavcodec/vvc/sei.c
+++ b/libavcodec/vvc/sei.c
@@ -24,15 +24,81 @@
#include "dec.h"
#include "libavutil/refstruct.h"
+static int decode_film_grain_characteristics(H2645SEIFilmGrainCharacteristics *h, const SEIRawFilmGrainCharacteristics *s, const VVCFrameContext *fc)
+{
+ const VVCSPS *sps = fc->ps.sps;
+
+ h->present = !s->fg_characteristics_cancel_flag;
+ if (h->present) {
+ h->model_id = s->fg_model_id;
+ h->separate_colour_description_present_flag = s->fg_separate_colour_description_present_flag;
+ if (h->separate_colour_description_present_flag) {
+ h->bit_depth_luma = s->fg_bit_depth_luma_minus8 + 8;
+ h->bit_depth_chroma = s->fg_bit_depth_chroma_minus8 + 8;
+ h->full_range = s->fg_full_range_flag;
+ h->color_primaries = s->fg_colour_primaries;
+ h->transfer_characteristics = s->fg_transfer_characteristics;
+ h->matrix_coeffs = s->fg_matrix_coeffs;
+ } else {
+ if (!sps) {
+ av_log(fc->log_ctx, AV_LOG_ERROR,
+ "No active SPS for film_grain_characteristics.\n");
+ return AVERROR_INVALIDDATA;
+ }
+ h->bit_depth_luma = sps->bit_depth;
+ h->bit_depth_chroma = sps->bit_depth;
+ h->full_range = sps->r->vui.vui_full_range_flag;
+ h->color_primaries = sps->r->vui.vui_colour_primaries;
+ h->transfer_characteristics = sps->r->vui.vui_transfer_characteristics;
+ h->matrix_coeffs = sps->r->vui.vui_matrix_coeffs ;
+ }
+
+ h->blending_mode_id = s->fg_blending_mode_id;
+ h->log2_scale_factor = s->fg_log2_scale_factor;
+
+ for (int c = 0; c < 3; c++) {
+ h->comp_model_present_flag[c] = s->fg_comp_model_present_flag[c];
+ if (h->comp_model_present_flag[c]) {
+ h->num_intensity_intervals[c] = s->fg_num_intensity_intervals_minus1[c] + 1;
+ h->num_model_values[c] = s->fg_num_model_values_minus1[c] + 1;
+
+ if (h->num_model_values[c] > 6)
+ return AVERROR_INVALIDDATA;
+
+ for (int i = 0; i < h->num_intensity_intervals[c]; i++) {
+ h->intensity_interval_lower_bound[c][i] = s->fg_intensity_interval_lower_bound[c][i];
+ h->intensity_interval_upper_bound[c][i] = s->fg_intensity_interval_upper_bound[c][i];
+ for (int j = 0; j < h->num_model_values[c]; j++)
+ h->comp_model_value[c][i][j] = s->fg_comp_model_value[c][i][j];
+ }
+ }
+ }
+
+ h->persistence_flag = s->fg_characteristics_persistence_flag;
+ }
+
+ return 0;
+}
+
int ff_vvc_sei_decode(VVCSEI *s, const H266RawSEI *sei, const struct VVCFrameContext *fc)
{
+ H2645SEI *c = &s->common;
+
if (!sei)
return AVERROR_INVALIDDATA;
for (int i = 0; i < sei->message_list.nb_messages; i++) {
SEIRawMessage *message = &sei->message_list.messages[i];
+ void *payload = message->payload;
switch (message->payload_type) {
+ case SEI_TYPE_FILM_GRAIN_CHARACTERISTICS:
+ av_refstruct_unref(&c->film_grain_characteristics);
+ c->film_grain_characteristics = av_refstruct_allocz(sizeof(*c->film_grain_characteristics));
+ if (!c->film_grain_characteristics)
+ return AVERROR(ENOMEM);
+ return decode_film_grain_characteristics(c->film_grain_characteristics, payload, fc);
+
default:
av_log(fc->log_ctx, AV_LOG_DEBUG, "Skipped %s SEI %d\n",
sei->nal_unit_header.nal_unit_type == VVC_PREFIX_SEI_NUT ?
--
2.44.0.windows.1
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