mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-27 18:50:48 +00:00
v4l2: object: Move the GstPoll into v4l2object
Moves the GstPoll from the buffer pool into v4l2object. This will be needed to poll for events before the pool has been created. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4437>
This commit is contained in:
Nicolas Dufresne
parent
457dd19a90
commit
5c820862fd
4 changed files with 178 additions and 108 deletions
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@ -1079,7 +1079,7 @@ gst_v4l2_buffer_pool_flush_start (GstBufferPool * bpool)
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GST_DEBUG_OBJECT (pool, "start flushing");
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gst_poll_set_flushing (pool->poll, TRUE);
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gst_poll_set_flushing (pool->obj->poll, TRUE);
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GST_OBJECT_LOCK (pool);
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pool->empty = FALSE;
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@ -1100,13 +1100,12 @@ gst_v4l2_buffer_pool_flush_stop (GstBufferPool * bpool)
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if (pool->other_pool && gst_buffer_pool_is_active (pool->other_pool))
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gst_buffer_pool_set_flushing (pool->other_pool, FALSE);
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gst_poll_set_flushing (pool->poll, FALSE);
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gst_poll_set_flushing (pool->obj->poll, FALSE);
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}
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static GstFlowReturn
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gst_v4l2_buffer_pool_poll (GstV4l2BufferPool * pool, gboolean wait)
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{
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gint ret;
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GstClockTime timeout;
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if (wait)
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@ -1121,7 +1120,7 @@ gst_v4l2_buffer_pool_poll (GstV4l2BufferPool * pool, gboolean wait)
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if (!wait && pool->empty) {
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GST_OBJECT_UNLOCK (pool);
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goto no_buffers;
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return GST_V4L2_FLOW_LAST_BUFFER;
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}
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while (pool->empty)
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@ -1130,87 +1129,14 @@ gst_v4l2_buffer_pool_poll (GstV4l2BufferPool * pool, gboolean wait)
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GST_OBJECT_UNLOCK (pool);
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}
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if (!pool->can_poll_device) {
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if (!pool->obj->can_poll_device) {
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if (wait)
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goto done;
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return GST_FLOW_OK;
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else
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goto no_buffers;
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return GST_V4L2_FLOW_LAST_BUFFER;
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}
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GST_LOG_OBJECT (pool, "polling device");
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again:
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ret = gst_poll_wait (pool->poll, timeout);
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if (G_UNLIKELY (ret < 0)) {
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switch (errno) {
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case EBUSY:
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goto stopped;
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case EAGAIN:
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case EINTR:
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goto again;
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case ENXIO:
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GST_WARNING_OBJECT (pool,
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"v4l2 device doesn't support polling. Disabling"
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" using libv4l2 in this case may cause deadlocks");
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pool->can_poll_device = FALSE;
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goto done;
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default:
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goto select_error;
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}
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}
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if (gst_poll_fd_has_error (pool->poll, &pool->pollfd))
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goto select_error;
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/* PRI is used to signal that events are available */
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if (gst_poll_fd_has_pri (pool->poll, &pool->pollfd)) {
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struct v4l2_event event = { 0, };
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if (!gst_v4l2_dequeue_event (pool->obj, &event))
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goto dqevent_failed;
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if (event.type != V4L2_EVENT_SOURCE_CHANGE) {
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GST_INFO_OBJECT (pool, "Received unhandled event, ignoring.");
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goto again;
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}
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if ((event.u.src_change.changes & V4L2_EVENT_SRC_CH_RESOLUTION) == 0) {
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GST_DEBUG_OBJECT (pool,
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"Received non-resolution source-change, ignoring.");
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goto again;
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}
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return GST_V4L2_FLOW_RESOLUTION_CHANGE;
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}
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if (ret == 0)
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goto no_buffers;
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done:
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return GST_FLOW_OK;
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/* ERRORS */
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stopped:
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{
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GST_DEBUG_OBJECT (pool, "stop called");
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return GST_FLOW_FLUSHING;
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}
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select_error:
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{
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GST_ELEMENT_ERROR (pool->obj->element, RESOURCE, READ, (NULL),
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("poll error %d: %s (%d)", ret, g_strerror (errno), errno));
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return GST_FLOW_ERROR;
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}
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no_buffers:
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{
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return GST_V4L2_FLOW_LAST_BUFFER;
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}
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dqevent_failed:
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{
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GST_ELEMENT_ERROR (pool->obj->element, RESOURCE, READ, (NULL),
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("dqevent error: %s (%d)", g_strerror (errno), errno));
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return GST_FLOW_ERROR;
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}
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return gst_v4l2_object_poll (pool->obj, timeout);
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}
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static GstFlowReturn
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@ -1760,8 +1686,6 @@ gst_v4l2_buffer_pool_finalize (GObject * object)
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if (pool->video_fd >= 0)
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pool->obj->close (pool->video_fd);
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gst_poll_free (pool->poll);
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/* This can't be done in dispose method because we must not set pointer
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* to NULL as it is part of the v4l2object and dispose could be called
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* multiple times */
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@ -1777,8 +1701,6 @@ gst_v4l2_buffer_pool_finalize (GObject * object)
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static void
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gst_v4l2_buffer_pool_init (GstV4l2BufferPool * pool)
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{
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pool->poll = gst_poll_new (TRUE);
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pool->can_poll_device = TRUE;
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g_cond_init (&pool->empty_cond);
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pool->empty = TRUE;
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pool->orphaned = FALSE;
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@ -1841,17 +1763,8 @@ gst_v4l2_buffer_pool_new (GstV4l2Object * obj, GstCaps * caps)
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g_object_ref_sink (pool);
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g_free (name);
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gst_poll_fd_init (&pool->pollfd);
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pool->pollfd.fd = fd;
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gst_poll_add_fd (pool->poll, &pool->pollfd);
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if (V4L2_TYPE_IS_OUTPUT (obj->type))
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gst_poll_fd_ctl_write (pool->poll, &pool->pollfd, TRUE);
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else
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gst_poll_fd_ctl_read (pool->poll, &pool->pollfd, TRUE);
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pool->video_fd = fd;
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pool->obj = obj;
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pool->can_poll_device = TRUE;
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pool->vallocator = gst_v4l2_allocator_new (GST_OBJECT (pool), obj);
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if (pool->vallocator == NULL)
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@ -2336,11 +2249,5 @@ gst_v4l2_buffer_pool_flush (GstV4l2Object * v4l2object)
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void
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gst_v4l2_buffer_pool_enable_resolution_change (GstV4l2BufferPool * pool)
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{
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guint32 input_id = 0;
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/* Make sure we subscribe for the current input */
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gst_v4l2_get_input (pool->obj, &input_id);
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if (gst_v4l2_subscribe_event (pool->obj, V4L2_EVENT_SOURCE_CHANGE, input_id))
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gst_poll_fd_ctl_pri (pool->poll, &pool->pollfd, TRUE);
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gst_v4l2_object_subscribe_event (pool->obj, V4L2_EVENT_SOURCE_CHANGE);
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}
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@ -64,9 +64,6 @@ struct _GstV4l2BufferPool
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GstV4l2Object *obj; /* the v4l2 object */
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gint video_fd; /* a dup(2) of the v4l2object's video_fd */
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GstPoll *poll; /* a poll for video_fd */
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GstPollFD pollfd;
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gboolean can_poll_device;
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gboolean empty;
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GCond empty_cond;
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@ -525,6 +525,9 @@ gst_v4l2_object_new (GstElement * element,
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v4l2object->no_initial_format = FALSE;
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v4l2object->poll = gst_poll_new (TRUE);
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v4l2object->can_poll_device = TRUE;
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/* We now disable libv4l2 by default, but have an env to enable it. */
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#ifdef HAVE_LIBV4L2
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if (g_getenv ("GST_V4L2_USE_LIBV4L2")) {
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@ -572,6 +575,8 @@ gst_v4l2_object_destroy (GstV4l2Object * v4l2object)
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g_free (v4l2object->par);
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g_free (v4l2object->channel);
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gst_poll_free (v4l2object->poll);
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if (v4l2object->formats) {
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gst_v4l2_object_clear_format_list (v4l2object);
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}
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@ -900,6 +905,20 @@ gst_v4l2_set_defaults (GstV4l2Object * v4l2object)
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}
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}
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static void
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gst_v4l2_object_init_poll (GstV4l2Object * v4l2object)
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{
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gst_poll_fd_init (&v4l2object->pollfd);
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v4l2object->pollfd.fd = v4l2object->video_fd;
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gst_poll_add_fd (v4l2object->poll, &v4l2object->pollfd);
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if (V4L2_TYPE_IS_OUTPUT (v4l2object->type))
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gst_poll_fd_ctl_write (v4l2object->poll, &v4l2object->pollfd, TRUE);
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else
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gst_poll_fd_ctl_read (v4l2object->poll, &v4l2object->pollfd, TRUE);
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v4l2object->can_poll_device = TRUE;
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}
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gboolean
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gst_v4l2_object_open (GstV4l2Object * v4l2object, GstV4l2Error * error)
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{
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@ -908,17 +927,20 @@ gst_v4l2_object_open (GstV4l2Object * v4l2object, GstV4l2Error * error)
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else
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return FALSE;
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gst_v4l2_object_init_poll (v4l2object);
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return TRUE;
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}
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gboolean
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gst_v4l2_object_open_shared (GstV4l2Object * v4l2object, GstV4l2Object * other)
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{
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gboolean ret;
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if (gst_v4l2_dup (v4l2object, other)) {
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gst_v4l2_object_init_poll (v4l2object);
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return TRUE;
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}
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ret = gst_v4l2_dup (v4l2object, other);
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return ret;
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return FALSE;
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}
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gboolean
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@ -4597,6 +4619,8 @@ gst_v4l2_object_unlock (GstV4l2Object * v4l2object)
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GST_LOG_OBJECT (v4l2object->dbg_obj, "start flushing");
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gst_poll_set_flushing (v4l2object->poll, TRUE);
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if (!pool)
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return ret;
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@ -4615,6 +4639,8 @@ gst_v4l2_object_unlock_stop (GstV4l2Object * v4l2object)
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GST_LOG_OBJECT (v4l2object->dbg_obj, "stop flushing");
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gst_poll_set_flushing (v4l2object->poll, FALSE);
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if (!pool)
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return ret;
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@ -4636,6 +4662,8 @@ gst_v4l2_object_stop (GstV4l2Object * v4l2object)
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if (!GST_V4L2_IS_ACTIVE (v4l2object))
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goto done;
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gst_poll_set_flushing (v4l2object->poll, TRUE);
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pool = gst_v4l2_object_get_buffer_pool (v4l2object);
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if (pool) {
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if (!gst_v4l2_buffer_pool_orphan (v4l2object)) {
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@ -5466,3 +5494,135 @@ gst_v4l2_object_get_buffer_pool (GstV4l2Object * v4l2object)
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return ret;
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}
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/**
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* gst_v4l2_object_poll:
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* @v4l2object: a #GstV4l2Object
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* @timeout: timeout of type #GstClockTime
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*
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* Poll the video file descriptor for read when this is a capture, write when
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* this is an output. It will also watch for errors and source change events.
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* If a source change event is received, %GST_V4L2_FLOW_RESOLUTION_CHANGE will
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* be returned. If the poll was interrupted, %GST_FLOW_FLUSHING is returned.
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* If there was no read or write indicator, %GST_V4L2_FLOW_LAST_BUFFER is
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* returned. It may also return %GST_FLOW_ERROR if some unexpected error
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* occured.
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*
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* Returns: GST_FLOW_OK if buffers are ready to be queued or dequeued.
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*/
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GstFlowReturn
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gst_v4l2_object_poll (GstV4l2Object * v4l2object, GstClockTime timeout)
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{
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gint ret;
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if (!v4l2object->can_poll_device) {
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if (timeout != 0)
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goto done;
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else
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goto no_buffers;
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}
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GST_LOG_OBJECT (v4l2object->dbg_obj, "polling device");
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again:
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ret = gst_poll_wait (v4l2object->poll, timeout);
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if (G_UNLIKELY (ret < 0)) {
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switch (errno) {
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case EBUSY:
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goto stopped;
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case EAGAIN:
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case EINTR:
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goto again;
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case ENXIO:
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GST_WARNING_OBJECT (v4l2object->dbg_obj,
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"v4l2 device doesn't support polling. Disabling"
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" using libv4l2 in this case may cause deadlocks");
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v4l2object->can_poll_device = FALSE;
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goto done;
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default:
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goto select_error;
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}
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}
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if (gst_poll_fd_has_error (v4l2object->poll, &v4l2object->pollfd))
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goto select_error;
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/* PRI is used to signal that events are available */
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if (gst_poll_fd_has_pri (v4l2object->poll, &v4l2object->pollfd)) {
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struct v4l2_event event = { 0, };
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if (!gst_v4l2_dequeue_event (v4l2object, &event))
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goto dqevent_failed;
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if (event.type != V4L2_EVENT_SOURCE_CHANGE) {
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GST_INFO_OBJECT (v4l2object->dbg_obj,
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"Received unhandled event, ignoring.");
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goto again;
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}
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if ((event.u.src_change.changes & V4L2_EVENT_SRC_CH_RESOLUTION) == 0) {
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GST_DEBUG_OBJECT (v4l2object->dbg_obj,
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"Received non-resolution source-change, ignoring.");
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goto again;
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}
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return GST_V4L2_FLOW_RESOLUTION_CHANGE;
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}
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if (ret == 0)
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goto no_buffers;
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done:
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return GST_FLOW_OK;
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/* ERRORS */
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stopped:
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{
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GST_DEBUG_OBJECT (v4l2object->dbg_obj, "stop called");
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return GST_FLOW_FLUSHING;
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}
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select_error:
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{
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GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ, (NULL),
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("poll error %d: %s (%d)", ret, g_strerror (errno), errno));
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return GST_FLOW_ERROR;
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}
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no_buffers:
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{
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return GST_V4L2_FLOW_LAST_BUFFER;
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}
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dqevent_failed:
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{
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GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ, (NULL),
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("dqevent error: %s (%d)", g_strerror (errno), errno));
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return GST_FLOW_ERROR;
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}
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}
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/**
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* gst_v4l2_object_subscribe_event:
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* @v4l2object: a #GstV4l2Object
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* @event: the event ID
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*
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* Subscribe to an event, and enable polling for these. Note that only
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* %V4L2_EVENT_SOURCE_CHANGE is currently supported by the poll helper.
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*
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* Returns: %TRUE if the driver supports this event
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*/
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gboolean
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gst_v4l2_object_subscribe_event (GstV4l2Object * v4l2object, guint32 event)
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{
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guint32 id = 0;
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g_return_val_if_fail (v4l2object != NULL, FALSE);
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g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2object), FALSE);
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v4l2object->get_in_out_func (v4l2object, &id);
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if (gst_v4l2_subscribe_event (v4l2object, event, id)) {
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gst_poll_fd_ctl_pri (v4l2object->poll, &v4l2object->pollfd, TRUE);
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return TRUE;
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}
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return FALSE;
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}
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@ -136,6 +136,9 @@ struct _GstV4l2Object {
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/* the video-device's file descriptor */
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gint video_fd;
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GstV4l2IOMode mode;
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GstPoll *poll;
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GstPollFD pollfd;
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gboolean can_poll_device;
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gboolean active;
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@ -316,6 +319,9 @@ GstBufferPool * gst_v4l2_object_get_buffer_pool (GstV4l2Object * v4l2object);
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GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);
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|
||||
GstFlowReturn gst_v4l2_object_poll (GstV4l2Object * v4l2object, GstClockTime timeout);
|
||||
gboolean gst_v4l2_object_subscribe_event (GstV4l2Object * v4l2object, guint32 event);
|
||||
|
||||
/* crop / compose */
|
||||
gboolean gst_v4l2_object_set_crop (GstV4l2Object * obj, struct v4l2_rect *result);
|
||||
gboolean gst_v4l2_object_get_crop_bounds (GstV4l2Object * obj, struct v4l2_rect *bounds);
|
||||
|
|
|
|||
Loading…
Reference in a new issue