avcodec: move content light level SEI handling to h2645_sei

This allows this common H.274 SEI to be parsed from both H.264
as well as HEVC, as well as probably from VVC in the future.

Generally attempts to keep the original code as similar as possible.

FATE test refererence changes only change the order of side data
export within a single frame. Nothing else seems to have changed.

libavcodec/h2645_sei.c

@@ -422,6 +422,23 @@ static int decode_nal_sei_mastering_display_info(H2645SEIMasteringDisplay *s,
     return 0;
 }
 
+static int decode_nal_sei_content_light_info(H2645SEIContentLight *s,
+                                             GetByteContext *gb)
+{
+    if (bytestream2_get_bytes_left(gb) < 4)
+        return AVERROR_INVALIDDATA;
+
+    // Max and average light levels
+    s->max_content_light_level     = bytestream2_get_be16u(gb);
+    s->max_pic_average_light_level = bytestream2_get_be16u(gb);
+    // As this SEI message comes before the first frame that references it,
+    // initialize the flag to 2 and decrement on IRAP access unit so it
+    // persists for the coded video sequence (e.g., between two IRAPs)
+    s->present = 2;
+
+    return  0;
+}
+
 int ff_h2645_sei_message_decode(H2645SEI *h, enum SEIType type,
                                 enum AVCodecID codec_id, GetBitContext *gb,
                                 GetByteContext *gbyte, void *logctx)
@@ -445,6 +462,8 @@ int ff_h2645_sei_message_decode(H2645SEI *h, enum SEIType type,
     case SEI_TYPE_MASTERING_DISPLAY_COLOUR_VOLUME:
         return decode_nal_sei_mastering_display_info(&h->mastering_display,
                                                      gbyte);
+    case SEI_TYPE_CONTENT_LIGHT_LEVEL_INFO:
+        return decode_nal_sei_content_light_info(&h->content_light, gbyte);
     default:
         return FF_H2645_SEI_MESSAGE_UNHANDLED;
     }
@@ -730,6 +749,19 @@ int ff_h2645_sei_to_frame(AVFrame *frame, H2645SEI *sei,
                av_q2d(metadata->min_luminance), av_q2d(metadata->max_luminance));
     }
 
+    if (sei->content_light.present) {
+        AVContentLightMetadata *metadata =
+            av_content_light_metadata_create_side_data(frame);
+        if (!metadata)
+            return AVERROR(ENOMEM);
+        metadata->MaxCLL  = sei->content_light.max_content_light_level;
+        metadata->MaxFALL = sei->content_light.max_pic_average_light_level;
+
+        av_log(avctx, AV_LOG_DEBUG, "Content Light Level Metadata:\n");
+        av_log(avctx, AV_LOG_DEBUG, "MaxCLL=%d, MaxFALL=%d\n",
+               metadata->MaxCLL, metadata->MaxFALL);
+    }
+
     return 0;
 }
 
@@ -746,4 +778,5 @@ void ff_h2645_sei_reset(H2645SEI *s)
 
     s->ambient_viewing_environment.present = 0;
     s->mastering_display.present = 0;
+    s->content_light.present = 0;
 }

libavcodec/h2645_sei.h

@@ -113,6 +113,12 @@ typedef struct H2645SEIMasteringDisplay {
     uint32_t min_luminance;
 } H2645SEIMasteringDisplay;
 
+typedef struct H2645SEIContentLight {
+    int present;
+    uint16_t max_content_light_level;
+    uint16_t max_pic_average_light_level;
+} H2645SEIContentLight;
+
 typedef struct H2645SEI {
     H2645SEIA53Caption a53_caption;
     H2645SEIAFD afd;
@@ -125,6 +131,7 @@ typedef struct H2645SEI {
     H2645SEIFilmGrainCharacteristics film_grain_characteristics;
     H2645SEIAmbientViewingEnvironment ambient_viewing_environment;
     H2645SEIMasteringDisplay mastering_display;
+    H2645SEIContentLight content_light;
 } H2645SEI;
 
 enum {

libavcodec/h264_slice.c

@@ -440,6 +440,7 @@ int ff_h264_update_thread_context(AVCodecContext *dst,
 
     h->sei.common.unregistered.x264_build = h1->sei.common.unregistered.x264_build;
     h->sei.common.mastering_display = h1->sei.common.mastering_display;
+    h->sei.common.content_light = h1->sei.common.content_light;
 
     if (!h->cur_pic_ptr)
         return 0;

libavcodec/hevc_sei.c

@@ -49,23 +49,6 @@ static int decode_nal_sei_decoded_picture_hash(HEVCSEIPictureHash *s,
     return 0;
 }
 
-static int decode_nal_sei_content_light_info(HEVCSEIContentLight *s,
-                                             GetByteContext *gb)
-{
-    if (bytestream2_get_bytes_left(gb) < 4)
-        return AVERROR_INVALIDDATA;
-
-    // Max and average light levels
-    s->max_content_light_level     = bytestream2_get_be16u(gb);
-    s->max_pic_average_light_level = bytestream2_get_be16u(gb);
-    // As this SEI message comes before the first frame that references it,
-    // initialize the flag to 2 and decrement on IRAP access unit so it
-    // persists for the coded video sequence (e.g., between two IRAPs)
-    s->present = 2;
-
-    return  0;
-}
-
 static int decode_nal_sei_pic_timing(HEVCSEI *s, GetBitContext *gb,
                                      const HEVCParamSets *ps, void *logctx)
 {
@@ -177,8 +160,6 @@ static int decode_nal_sei_prefix(GetBitContext *gb, GetByteContext *gbyte,
         return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gbyte);
     case SEI_TYPE_PIC_TIMING:
         return decode_nal_sei_pic_timing(s, gb, ps, logctx);
-    case SEI_TYPE_CONTENT_LIGHT_LEVEL_INFO:
-        return decode_nal_sei_content_light_info(&s->content_light, gbyte);
     case SEI_TYPE_ACTIVE_PARAMETER_SETS:
         return decode_nal_sei_active_parameter_sets(s, gb, logctx);
     case SEI_TYPE_TIME_CODE:

libavcodec/hevc_sei.h

@@ -53,12 +53,6 @@ typedef struct HEVCSEIPictureTiming {
     int picture_struct;
 } HEVCSEIPictureTiming;
 
-typedef struct HEVCSEIContentLight {
-    int present;
-    uint16_t max_content_light_level;
-    uint16_t max_pic_average_light_level;
-} HEVCSEIContentLight;
-
 typedef struct HEVCSEIAlternativeTransfer {
     int present;
     int preferred_transfer_characteristics;
@@ -88,7 +82,6 @@ typedef struct HEVCSEI {
     H2645SEI common;
     HEVCSEIPictureHash picture_hash;
     HEVCSEIPictureTiming picture_timing;
-    HEVCSEIContentLight content_light;
     int active_seq_parameter_set_id;
     HEVCSEITimeCode timecode;
 } HEVCSEI;

libavcodec/hevcdec.c

@@ -31,7 +31,6 @@
 #include "libavutil/display.h"
 #include "libavutil/film_grain_params.h"
 #include "libavutil/internal.h"
-#include "libavutil/mastering_display_metadata.h"
 #include "libavutil/md5.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
@@ -2769,21 +2768,9 @@ static int set_side_data(HEVCContext *s)
     }
     // Decrement the mastering display flag when IRAP frame has no_rasl_output_flag=1
     // so the side data persists for the entire coded video sequence.
-    if (s->sei.content_light.present > 0 &&
+    if (s->sei.common.content_light.present > 0 &&
         IS_IRAP(s) && s->no_rasl_output_flag) {
-        s->sei.content_light.present--;
+        s->sei.common.content_light.present--;
-    }
-    if (s->sei.content_light.present) {
-        AVContentLightMetadata *metadata =
-            av_content_light_metadata_create_side_data(out);
-        if (!metadata)
-            return AVERROR(ENOMEM);
-        metadata->MaxCLL  = s->sei.content_light.max_content_light_level;
-        metadata->MaxFALL = s->sei.content_light.max_pic_average_light_level;
-
-        av_log(s->avctx, AV_LOG_DEBUG, "Content Light Level Metadata:\n");
-        av_log(s->avctx, AV_LOG_DEBUG, "MaxCLL=%d, MaxFALL=%d\n",
-               metadata->MaxCLL, metadata->MaxFALL);
     }
 
     ret = ff_h2645_sei_to_frame(out, &s->sei.common, AV_CODEC_ID_HEVC, NULL,
@@ -3624,7 +3611,7 @@ static int hevc_update_thread_context(AVCodecContext *dst,
     s->sei.common.display_orientation  = s0->sei.common.display_orientation;
     s->sei.common.alternative_transfer = s0->sei.common.alternative_transfer;
     s->sei.common.mastering_display    = s0->sei.common.mastering_display;
-    s->sei.content_light        = s0->sei.content_light;
+    s->sei.common.content_light        = s0->sei.common.content_light;
 
     ret = export_stream_params_from_sei(s);
     if (ret < 0)

tests/ref/fate/hevc-hdr-vivid-metadata

@@ -1,10 +1,5 @@
 [FRAME]
 [SIDE_DATA]
-side_data_type=Content light level metadata
-max_content=0
-max_average=0
-[/SIDE_DATA]
-[SIDE_DATA]
 side_data_type=H.26[45] User Data Unregistered SEI message
 [/SIDE_DATA]
 [SIDE_DATA]
@@ -21,6 +16,11 @@ min_luminance=50/10000
 max_luminance=40000000/10000
 [/SIDE_DATA]
 [SIDE_DATA]
+side_data_type=Content light level metadata
+max_content=0
+max_average=0
+[/SIDE_DATA]
+[SIDE_DATA]
 side_data_type=HDR Dynamic Metadata CUVA 005.1 2021 (Vivid)
 system_start_code=1
 num_windows=1

tests/ref/fate/hevc-hdr10-plus-metadata

@@ -1,10 +1,5 @@
 [FRAME]
 [SIDE_DATA]
-side_data_type=Content light level metadata
-max_content=1000
-max_average=200
-[/SIDE_DATA]
-[SIDE_DATA]
 side_data_type=Mastering display metadata
 red_x=13250/50000
 red_y=34500/50000
@@ -18,6 +13,11 @@ min_luminance=50/10000
 max_luminance=10000000/10000
 [/SIDE_DATA]
 [SIDE_DATA]
+side_data_type=Content light level metadata
+max_content=1000
+max_average=200
+[/SIDE_DATA]
+[SIDE_DATA]
 side_data_type=HDR Dynamic Metadata SMPTE2094-40 (HDR10+)
 application version=1
 num_windows=1