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v4l2: call VIDIOC_REQBUFS with count = 0 in pool_finalize

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Without this the following sequence fails:

- set_caps()
  - object_stop() (does nothing)
  - set_format() -> VIDIOC_S_FMT
- set_config() -> VIDIOC_REQBUFS with count = N
- set_caps()
  - object_stop()
    - pool_finalize()
  - set_format() -> VIDIOC_S_FMT => EBUSY

Usually the pool is started after set_config(), in which case object_stop()
will result in a pool_stop and therefore VIDIOC_REQBUFS with count = 0 but
that is not guaranteed.
Also calling VIDIOC_REQBUFS with count = 0 in pool_finalize() if necessary
fixes this problem.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=701543
This commit is contained in:
Michael Olbrich 2013-06-03 17:07:10 +02:00 committed by Wim Taymans
parent 496995a7d5
commit 3417a791ac
1 changed files with 20 additions and 12 deletions
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32
sys/v4l2/gstv4l2bufferpool.c
View file

@ -538,6 +538,23 @@ start_failed:
}
}
static void
gst_v4l2_buffer_pool_free_buffers (GstV4l2BufferPool * pool)
{
if (pool->num_buffers > 0) {
struct v4l2_requestbuffers breq;
memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
breq.type = pool->obj->type;
breq.count = 0;
breq.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl (pool->video_fd, VIDIOC_REQBUFS, &breq) < 0) {
GST_ERROR_OBJECT (pool, "error releasing buffers: %s",
g_strerror (errno));
}
pool->num_buffers = 0;
}
}
static gboolean
gst_v4l2_buffer_pool_stop (GstBufferPool * bpool)
{
@ -582,18 +599,7 @@ gst_v4l2_buffer_pool_stop (GstBufferPool * bpool)
g_free (pool->buffers);
pool->buffers = NULL;
if (pool->num_buffers > 0) {
struct v4l2_requestbuffers breq;
memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
breq.type = obj->type;
breq.count = 0;
breq.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl (pool->video_fd, VIDIOC_REQBUFS, &breq) < 0) {
GST_ERROR_OBJECT (pool, "error releasing buffers: %s",
g_strerror (errno));
}
pool->num_buffers = 0;
}
gst_v4l2_buffer_pool_free_buffers (pool);
return ret;
@ -1003,6 +1009,8 @@ gst_v4l2_buffer_pool_finalize (GObject * object)
{
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (object);
gst_v4l2_buffer_pool_free_buffers (pool);
if (pool->video_fd >= 0)
v4l2_close (pool->video_fd);
if (pool->allocator)