[FFmpeg-devel] [PATCH] lavfi/framesync: avoid forcing frame writability unnecessarily

[Anton Khirnov <anton@khirnov.net>]

Callers of ff_framesync_get_frame() generally do not expect the result
to be writable, those that do (e.g. ff_framesync_dualinput_get_writable())
ensure writability themselves.

Significantly reduces memory consumption in complex graphs with
framesync-based filters (e.g. scale, ssim).

Reported-By: Mark Shwartzman
---
 libavfilter/framesync.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/libavfilter/framesync.c b/libavfilter/framesync.c
index 535fbe9c7c..8e06e0e700 100644
--- a/libavfilter/framesync.c
+++ b/libavfilter/framesync.c
@@ -273,7 +273,6 @@ int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe,
     AVFrame *frame;
     unsigned need_copy = 0, i;
     int64_t pts_next;
-    int ret;
 
     if (!fs->in[in].frame) {
         *rframe = NULL;
@@ -291,10 +290,6 @@ int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe,
         if (need_copy) {
             if (!(frame = av_frame_clone(frame)))
                 return AVERROR(ENOMEM);
-            if ((ret = ff_inlink_make_frame_writable(fs->parent->inputs[in], &frame)) < 0) {
-                av_frame_free(&frame);
-                return ret;
-            }
         } else {
             fs->in[in].frame = NULL;
         }
-- 
2.43.0

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