avcodec/libdav1d: export decoder frame delay

As this is an AV_CODEC_CAP_OTHER_THREADS decoder, threading is handled by the
underlying library. In this case, the frame delay is calculated by libdav1d
based on the values from avctx->thread_count and the private max_frame_delay
option.
Export said delay reported by the library in AVCodecContext.delay

Reviewed-by: Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/libdav1d.c

@@ -276,6 +276,15 @@ static av_cold int libdav1d_init(AVCodecContext *c)
     if (res < 0)
         return AVERROR(ENOMEM);
 
+#if FF_DAV1D_VERSION_AT_LEAST(6,7)
+    res = dav1d_get_frame_delay(&s);
+    if (res < 0) // Should not happen
+        return AVERROR_EXTERNAL;
+
+    // When dav1d_get_frame_delay() returns 1, there's no delay whatsoever
+    c->delay = res > 1 ? res : 0;
+#endif
+
     return 0;
 }
 

libavcodec/version.h

@@ -30,7 +30,7 @@
 #include "version_major.h"
 
 #define LIBAVCODEC_VERSION_MINOR  14
-#define LIBAVCODEC_VERSION_MICRO 100
+#define LIBAVCODEC_VERSION_MICRO 101
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \