[FFmpeg-devel] [PATCH 6/6] ffplay: use AV_PKT_FLAG_DISPOSABLE in frame drop logic

[John Stebbins]

---
 fftools/ffplay.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/fftools/ffplay.c b/fftools/ffplay.c
index 10a917194d..f1e0522528 100644
--- a/fftools/ffplay.c
+++ b/fftools/ffplay.c
@@ -198,6 +198,8 @@ typedef struct Decoder {
     int64_t next_pts;
     AVRational next_pts_tb;
     SDL_Thread *decoder_tid;
+    int drop_disposable;
+    int frame_drops_disposable;
 } Decoder;
 
 typedef struct VideoState {
@@ -660,10 +662,15 @@ static int decoder_decode_frame(Decoder *d, AVFrame *frame, AVSubtitle *sub) {
                     ret = got_frame ? 0 : (pkt.data ? AVERROR(EAGAIN) : AVERROR_EOF);
                 }
             } else {
-                if (avcodec_send_packet(d->avctx, &pkt) == AVERROR(EAGAIN)) {
-                    av_log(d->avctx, AV_LOG_ERROR, "Receive_frame and send_packet both returned EAGAIN, which is an API violation.\n");
-                    d->packet_pending = 1;
-                    av_packet_move_ref(&d->pkt, &pkt);
+                if (d->avctx->codec_type == AVMEDIA_TYPE_VIDEO &&
+                    d->drop_disposable && pkt.flags & AV_PKT_FLAG_DISPOSABLE) {
+                    d->frame_drops_disposable++;
+                } else {
+                    if (avcodec_send_packet(d->avctx, &pkt) == AVERROR(EAGAIN)) {
+                        av_log(d->avctx, AV_LOG_ERROR, "Receive_frame and send_packet both returned EAGAIN, which is an API violation.\n");
+                        d->packet_pending = 1;
+                        av_packet_move_ref(&d->pkt, &pkt);
+                    }
                 }
             }
             av_packet_unref(&pkt);
@@ -1621,6 +1628,8 @@ retry:
                     is->frame_drops_late++;
                     frame_queue_next(&is->pictq);
                     goto retry;
+                } else {
+                    is->viddec.drop_disposable = 0;
                 }
             }
 
@@ -1699,7 +1708,8 @@ display:
                    get_master_clock(is),
                    (is->audio_st && is->video_st) ? "A-V" : (is->video_st ? "M-V" : (is->audio_st ? "M-A" : "   ")),
                    av_diff,
-                   is->frame_drops_early + is->frame_drops_late,
+                   is->frame_drops_early + is->frame_drops_late +
+                                           is->viddec.frame_drops_disposable,
                    aqsize / 1024,
                    vqsize / 1024,
                    sqsize,
@@ -1767,6 +1777,7 @@ static int get_video_frame(VideoState *is, AVFrame *frame)
                     is->frame_drops_early++;
                     av_frame_unref(frame);
                     got_picture = 0;
+                    is->viddec.drop_disposable = 1;
                 }
             }
         }
-- 
2.13.6