lavf/mpegts: support DOVI Video Stream Descriptor

support DOVI Video Stream Descriptor from Dolby Vision Streams
Within the MPEG-2 Transport Stream Format V1.2

From the spec: https://www.dolby.com/us/en/technologies/\
dolby-vision/dolby-vision-bitstreams-in-mpeg-2-transport-\
stream-multiplex-v1.2.pdf.

export the DOVI information with sidedata.
Signed-off-by: vacingfang <vacingfang@tencent.com>

libavformat/mpegts.c

@@ -28,6 +28,7 @@
 #include "libavutil/mathematics.h"
 #include "libavutil/opt.h"
 #include "libavutil/avassert.h"
+#include "libavutil/dovi_meta.h"
 #include "libavcodec/bytestream.h"
 #include "libavcodec/get_bits.h"
 #include "libavcodec/opus.h"
@@ -2146,6 +2147,53 @@ int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type
             st->request_probe        = 0;
         }
         break;
+    case 0xb0: /* DOVI video stream descriptor */
+        {
+            uint32_t buf;
+            AVDOVIDecoderConfigurationRecord *dovi;
+            size_t dovi_size;
+            int ret;
+            if (desc_end - *pp < 4) // (8 + 8 + 7 + 6 + 1 + 1 + 1) / 8
+                return AVERROR_INVALIDDATA;
+
+            dovi = av_dovi_alloc(&dovi_size);
+            if (!dovi)
+                return AVERROR(ENOMEM);
+
+            dovi->dv_version_major = get8(pp, desc_end);
+            dovi->dv_version_minor = get8(pp, desc_end);
+            buf = get16(pp, desc_end);
+            dovi->dv_profile        = (buf >> 9) & 0x7f;    // 7 bits
+            dovi->dv_level          = (buf >> 3) & 0x3f;    // 6 bits
+            dovi->rpu_present_flag  = (buf >> 2) & 0x01;    // 1 bit
+            dovi->el_present_flag   = (buf >> 1) & 0x01;    // 1 bit
+            dovi->bl_present_flag   =  buf       & 0x01;    // 1 bit
+            if (desc_end - *pp >= 20) {  // 4 + 4 * 4
+                buf = get8(pp, desc_end);
+                dovi->dv_bl_signal_compatibility_id = (buf >> 4) & 0x0f; // 4 bits
+            } else {
+                // 0 stands for None
+                // Dolby Vision V1.2.93 profiles and levels
+                dovi->dv_bl_signal_compatibility_id = 0;
+            }
+
+            ret = av_stream_add_side_data(st, AV_PKT_DATA_DOVI_CONF,
+                                          (uint8_t *)dovi, dovi_size);
+            if (ret < 0) {
+                av_freep(dovi);
+                return ret;
+            }
+
+            av_log(fc, AV_LOG_TRACE, "DOVI, version: %d.%d, profile: %d, level: %d, "
+                   "rpu flag: %d, el flag: %d, bl flag: %d, compatibility id: %d\n",
+                   dovi->dv_version_major, dovi->dv_version_minor,
+                   dovi->dv_profile, dovi->dv_level,
+                   dovi->rpu_present_flag,
+                   dovi->el_present_flag,
+                   dovi->bl_present_flag,
+                   dovi->dv_bl_signal_compatibility_id);
+        }
+        break;
     default:
         break;
     }