avcodec/libdav1d: add an option to set max frame delay

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/libdav1d.c

@@ -50,6 +50,7 @@ typedef struct Libdav1dContext {
     Dav1dData data;
     int tile_threads;
     int frame_threads;
+    int max_frame_delay;
     int apply_grain;
     int operating_point;
     int all_layers;
@@ -246,7 +247,9 @@ static av_cold int libdav1d_init(AVCodecContext *c)
         s.n_threads = FFMAX(dav1d->frame_threads, dav1d->tile_threads);
     else
         s.n_threads = FFMIN(threads, DAV1D_MAX_THREADS);
-    s.max_frame_delay = (c->flags & AV_CODEC_FLAG_LOW_DELAY) ? 1 : 0;
+    if (dav1d->max_frame_delay > 0 && (c->flags & AV_CODEC_FLAG_LOW_DELAY))
+        av_log(c, AV_LOG_WARNING, "Low delay mode requested, forcing max_frame_delay 1\n");
+    s.max_frame_delay = (c->flags & AV_CODEC_FLAG_LOW_DELAY) ? 1 : dav1d->max_frame_delay;
     av_log(c, AV_LOG_DEBUG, "Using %d threads, %d max_frame_delay\n",
            s.n_threads, s.max_frame_delay);
 #else
@@ -256,6 +259,8 @@ static av_cold int libdav1d_init(AVCodecContext *c)
     s.n_frame_threads = dav1d->frame_threads
                       ? dav1d->frame_threads
                       : FFMIN(ceil(threads / s.n_tile_threads), DAV1D_MAX_FRAME_THREADS);
+    if (dav1d->max_frame_delay > 0)
+        s.n_frame_threads = FFMIN(s.n_frame_threads, dav1d->max_frame_delay);
     av_log(c, AV_LOG_DEBUG, "Using %d frame threads, %d tile threads\n",
            s.n_frame_threads, s.n_tile_threads);
 #endif
@@ -555,12 +560,16 @@ static av_cold int libdav1d_close(AVCodecContext *c)
 #ifndef DAV1D_MAX_TILE_THREADS
 #define DAV1D_MAX_TILE_THREADS DAV1D_MAX_THREADS
 #endif
+#ifndef DAV1D_MAX_FRAME_DELAY
+#define DAV1D_MAX_FRAME_DELAY DAV1D_MAX_FRAME_THREADS
+#endif
 
 #define OFFSET(x) offsetof(Libdav1dContext, x)
 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
 static const AVOption libdav1d_options[] = {
     { "tilethreads", "Tile threads", OFFSET(tile_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_TILE_THREADS, VD | AV_OPT_FLAG_DEPRECATED },
     { "framethreads", "Frame threads", OFFSET(frame_threads), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_FRAME_THREADS, VD | AV_OPT_FLAG_DEPRECATED },
+    { "max_frame_delay", "Max frame delay", OFFSET(max_frame_delay), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, DAV1D_MAX_FRAME_DELAY, VD },
     { "filmgrain", "Apply Film Grain", OFFSET(apply_grain), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VD | AV_OPT_FLAG_DEPRECATED },
     { "oppoint",  "Select an operating point of the scalable bitstream", OFFSET(operating_point), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 31, VD },
     { "alllayers", "Output all spatial layers", OFFSET(all_layers), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },

libavcodec/version.h

@@ -30,7 +30,7 @@
 #include "version_major.h"
 
 #define LIBAVCODEC_VERSION_MINOR  50
-#define LIBAVCODEC_VERSION_MICRO 100
+#define LIBAVCODEC_VERSION_MICRO 101
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \