[FFmpeg-cvslog] fftools/sync_queue: support operation with no limiting streams

[Anton Khirnov]

ffmpeg | branch: master | Anton Khirnov <anton at khirnov.net> | Wed Mar 22 12:03:16 2023 +0100| [9a85245adfdb259da27a50e7822a7c842e5a3247] | committer: Anton Khirnov

fftools/sync_queue: support operation with no limiting streams

ffmpeg CLI will not create such queues currently, but this will become
useful in following commits.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9a85245adfdb259da27a50e7822a7c842e5a3247
---

 fftools/sync_queue.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fftools/sync_queue.c b/fftools/sync_queue.c
index 0aee4ef5ff..4204a821c1 100644
--- a/fftools/sync_queue.c
+++ b/fftools/sync_queue.c
@@ -96,6 +96,8 @@ struct SyncQueue {
 
     // pool of preallocated frames to avoid constant allocations
     ObjPool *pool;
+
+    int have_limiting;
 };
 
 static void frame_move(const SyncQueue *sq, SyncQueueFrame dst,
@@ -354,8 +356,9 @@ static int receive_for_stream(SyncQueue *sq, unsigned int stream_idx,
 
         /* We can release frames that do not end after the queue head.
          * Frames with no timestamps are just passed through with no conditions.
+         * Frames are also passed through when there are no limiting streams.
          */
-        if (cmp <= 0 || ts == AV_NOPTS_VALUE) {
+        if (cmp <= 0 || ts == AV_NOPTS_VALUE || !sq->have_limiting) {
             frame_move(sq, frame, peek);
             objpool_release(sq->pool, (void**)&peek);
             av_fifo_drain2(st->fifo, 1);
@@ -427,6 +430,8 @@ int sq_add_stream(SyncQueue *sq, int limiting)
     st->frames_max = UINT64_MAX;
     st->limiting   = limiting;
 
+    sq->have_limiting |= limiting;
+
     return sq->nb_streams++;
 }