avcodec/libdav1d: parse DV profile 10 T.35 OBU

This is thankfully passed through verbatim by libdav1d, so we can parse
it in our own code.

In theory, taking the DV profile from the packet-level configuration
struct is redundant since there is currently only one possible DV level
for AV1 (and all others would fail parsing), but this marginally
future-proofs it against possible new AV1-specific profiles being added
in the future.

libavcodec/libdav1d.c

@@ -35,6 +35,7 @@
 #include "bytestream.h"
 #include "codec_internal.h"
 #include "decode.h"
+#include "dovi_rpu.h"
 #include "internal.h"
 
 #define FF_DAV1D_VERSION_AT_LEAST(x,y) \
@@ -44,6 +45,7 @@ typedef struct Libdav1dContext {
     AVClass *class;
     Dav1dContext *c;
     AVBufferPool *pool;
+    DOVIContext dovi;
     int pool_size;
 
     Dav1dData data;
@@ -213,6 +215,7 @@ static av_cold int libdav1d_init(AVCodecContext *c)
 #else
     int threads = (c->thread_count ? c->thread_count : av_cpu_count()) * 3 / 2;
 #endif
+    const AVPacketSideData *sd;
     int res;
 
     av_log(c, AV_LOG_VERBOSE, "libdav1d %s\n", dav1d_version());
@@ -285,6 +288,11 @@ static av_cold int libdav1d_init(AVCodecContext *c)
     c->delay = res > 1 ? res : 0;
 #endif
 
+    dav1d->dovi.logctx = c;
+    dav1d->dovi.dv_profile = 10; // default for AV1
+    sd = ff_get_coded_side_data(c, AV_PKT_DATA_DOVI_CONF);
+    if (sd && sd->size > 0)
+        ff_dovi_update_cfg(&dav1d->dovi, (AVDOVIDecoderConfigurationRecord *) sd->data);
     return 0;
 }
 
@@ -579,6 +587,22 @@ static int libdav1d_receive_frame(AVCodecContext *c, AVFrame *frame)
                 goto fail;
             break;
         }
+        case 0x3B: { // dolby_provider_code
+            int provider_oriented_code = bytestream2_get_be32(&gb);
+            if (itut_t35->country_code != 0xB5 || provider_oriented_code != 0x800)
+                break;
+
+            res = ff_dovi_rpu_parse(&dav1d->dovi, gb.buffer, gb.buffer_end - gb.buffer);
+            if (res < 0) {
+                av_log(c, AV_LOG_WARNING, "Error parsing DOVI OBU.\n");
+                break; // ignore
+            }
+
+            res = ff_dovi_attach_side_data(&dav1d->dovi, frame);
+            if (res < 0)
+                goto fail;
+            break;
+        }
         default: // ignore unsupported provider codes
             break;
         }
@@ -638,6 +662,7 @@ static av_cold int libdav1d_close(AVCodecContext *c)
     Libdav1dContext *dav1d = c->priv_data;
 
     av_buffer_pool_uninit(&dav1d->pool);
+    ff_dovi_ctx_unref(&dav1d->dovi);
     dav1d_data_unref(&dav1d->data);
     dav1d_close(&dav1d->c);