[FFmpeg-cvslog] avcodec/libdav1d: don't repeatedly parse the same sequence header

[James Almer]

ffmpeg | branch: master | James Almer <jamrial at gmail.com> | Sat Jun 26 17:24:15 2021 -0300| [7ee17ec7e46afef0e0af20af196292ec75f50b62] | committer: James Almer

avcodec/libdav1d: don't repeatedly parse the same sequence header

Look at the event flag that signals a new sequence header was found
in the bitstream on supported libdav1d versions for this purpose.

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7ee17ec7e46afef0e0af20af196292ec75f50b62
---

 libavcodec/libdav1d.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libavcodec/libdav1d.c b/libavcodec/libdav1d.c
index 6370ae1fbf..c39df418d5 100644
--- a/libavcodec/libdav1d.c
+++ b/libavcodec/libdav1d.c
@@ -33,6 +33,9 @@
 #include "decode.h"
 #include "internal.h"
 
+#define FF_DAV1D_VERSION_AT_LEAST(x,y) \
+    (DAV1D_API_VERSION_MAJOR > (x) || DAV1D_API_VERSION_MAJOR == (x) && DAV1D_API_VERSION_MINOR >= (y))
+
 typedef struct Libdav1dContext {
     AVClass *class;
     Dav1dContext *c;
@@ -220,6 +223,9 @@ static int libdav1d_receive_frame(AVCodecContext *c, AVFrame *frame)
     Libdav1dContext *dav1d = c->priv_data;
     Dav1dData *data = &dav1d->data;
     Dav1dPicture pic = { 0 }, *p = &pic;
+#if FF_DAV1D_VERSION_AT_LEAST(5,1)
+    enum Dav1dEventFlags event_flags = 0;
+#endif
     int res;
 
     if (!data->sz) {
@@ -296,6 +302,10 @@ static int libdav1d_receive_frame(AVCodecContext *c, AVFrame *frame)
     frame->linesize[1] = p->stride[1];
     frame->linesize[2] = p->stride[1];
 
+#if FF_DAV1D_VERSION_AT_LEAST(5,1)
+    dav1d_get_event_flags(dav1d->c, &event_flags);
+    if (event_flags & DAV1D_EVENT_FLAG_NEW_SEQUENCE)
+#endif
     libdav1d_init_params(c, p->seq_hdr);
     res = ff_decode_frame_props(c, frame);
     if (res < 0)