From: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Date: Fri, 26 Jun 2020 18:48:14 +0000 (-0400)
Subject: v4l2bufferpool: Only resurrect the right amount of buffers
X-Git-Tag: accepted/tizen/unified/20210127.024855^0
X-Git-Url: http://review.tizen.org/git/?p=platform%2Fupstream%2Fgst-plugins-good.git;a=commitdiff_plain;h=fd65ebb9745d2ba91772e96e6dac80e117d0cc85

v4l2bufferpool: Only resurrect the right amount of buffers

On streamon, we need to resurrect (queue back) some buffers, as during
flushign seek we'd endup with an empty queued. We initially started with
resurrecting as many as we could without blocking, but that miss-behaved with
dynamic CREATE_BUFS, causing the pool to grow dramatically. This was limited
by the number of allocated buffers, but this still tried to resurrect too many
buffers for the first run, as activating the pool will queued buffers.

In this patch, we calculte the missing detal in the queue and only try and
resurrect that amount of buffers.

Change-Id: I3257c66f4049c55fa714ed639eeb56053b805277
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/651>
Signed-off-by: Jeongmo Yang <jm80.yang@samsung.com>
---

diff --git a/packaging/gst-plugins-good.spec b/packaging/gst-plugins-good.spec
index b2c52b9..9e7e945 100644
--- a/packaging/gst-plugins-good.spec
+++ b/packaging/gst-plugins-good.spec
@@ -3,7 +3,7 @@
 
 Name:           gst-plugins-good
 Version:        1.16.2
-Release:        15
+Release:        16
 License:        LGPL-2.1+
 Summary:        GStreamer Streaming-Media Framework Plug-Ins
 Url:            http://gstreamer.freedesktop.org/
diff --git a/sys/v4l2/gstv4l2bufferpool.c b/sys/v4l2/gstv4l2bufferpool.c
index 6a3f5ea..f4daa93 100644
--- a/sys/v4l2/gstv4l2bufferpool.c
+++ b/sys/v4l2/gstv4l2bufferpool.c
@@ -717,18 +717,21 @@ gst_v4l2_buffer_pool_streamon (GstV4l2BufferPool * pool)
     case GST_V4L2_IO_USERPTR:
     case GST_V4L2_IO_DMABUF:
     case GST_V4L2_IO_DMABUF_IMPORT:
-#ifndef TIZEN_FEATURE_TBM_SUPPORT_FOR_V4L2_DECODER
       if (!V4L2_TYPE_IS_OUTPUT (pool->obj->type)) {
-        guint i;
+        guint num_queued;
+        guint i, n = 0;
+
+        num_queued = g_atomic_int_get (&pool->num_queued);
+        if (num_queued < pool->num_allocated)
+          n = pool->num_allocated - num_queued;
 
         /* For captures, we need to enqueue buffers before we start streaming,
          * so the driver don't underflow immediatly. As we have put then back
          * into the base class queue, resurrect them, then releasing will queue
          * them back. */
-        for (i = 0; i < pool->num_allocated; i++)
+        for (i = 0; i < n; i++)
           gst_v4l2_buffer_pool_resurrect_buffer (pool);
       }
-#endif /* TIZEN_FEATURE_TBM_SUPPORT_FOR_V4L2_DECODER */
 
       if (obj->ioctl (pool->video_fd, VIDIOC_STREAMON, &obj->type) < 0)
         goto streamon_failed;