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v4l2object: Improve selecton of min/max in decide allocation

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This commit is contained in:
Nicolas Dufresne 2014-04-18 14:45:00 -04:00
parent ba32cf10f3
commit 7f8eff7845
1 changed files with 45 additions and 33 deletions
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78
sys/v4l2/gstv4l2object.c
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@ -2993,7 +2993,7 @@ gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
GstCaps *caps;
GstBufferPool *pool, *other_pool = NULL;
GstStructure *config;
guint size, min, max, extra = 0;
guint size, min, max, own_min = 0;
gboolean update;
gboolean has_video_meta, has_crop_meta;
gboolean can_share_own_pool, pushing_from_our_pool = FALSE;
@ -3024,25 +3024,6 @@ gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
GST_DEBUG_OBJECT (obj->element, "allocation: size:%u min:%u max:%u pool:%"
GST_PTR_FORMAT, size, min, max, pool);
if (min != 0) {
/* if there is a min-buffers suggestion, use it. We add 1 because we need 1
* buffer extra to capture while the other buffers are downstream */
min += 1;
} else {
min = 2;
}
/* Certain driver may expose a minimum through controls */
ctl.id = V4L2_CID_MIN_BUFFERS_FOR_CAPTURE;
if (v4l2_ioctl (obj->video_fd, VIDIOC_G_CTRL, &ctl) >= 0) {
GST_DEBUG_OBJECT (obj->element, "driver require a minimum of %d buffers",
ctl.value);
obj->min_buffers_for_capture = ctl.value;
extra += ctl.value;
} else {
obj->min_buffers_for_capture = 0;
}
has_video_meta =
gst_query_find_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
has_crop_meta =
@ -3119,6 +3100,39 @@ gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
if (size == 0)
goto no_size;
/* Certain driver may expose a minimum through controls */
ctl.id = V4L2_CID_MIN_BUFFERS_FOR_CAPTURE;
if (v4l2_ioctl (obj->video_fd, VIDIOC_G_CTRL, &ctl) >= 0) {
GST_DEBUG_OBJECT (obj->element, "driver require a minimum of %d buffers",
ctl.value);
obj->min_buffers_for_capture = ctl.value;
} else {
obj->min_buffers_for_capture = 0;
}
/* If pushing from our own pool, configure it with queried minimum,
* otherwise use the minimum required */
if (pushing_from_our_pool) {
/* When pushing from our own pool, we need what downstream one, to be able
* to fill the pipeline, the minimum required to decoder according to the
* driver and 1 more, so we don't endup up with everything downstream or
* held by the decoder. */
own_min = min + obj->min_buffers_for_capture + 1;
/* Update min/max so the base class does not reset our settings */
min = own_min;
max = 0;
} else {
/* In this case we'll have to configure two buffer pool. For our buffer
* pool, we'll need what the driver one, and one more, so we can dequeu */
own_min = obj->min_buffers_for_capture + 1;
/* for the downstream pool, we keep what downstream wants, though ensure
* at least a minimum if downstream didn't suggest anything (we are
* expecting the base class to create a default one for the context) */
min = MAX (min, GST_V4L2_MIN_BUFFERS);
}
/* Request a bigger max, if one was suggested but it's too small */
if (max != 0)
max = MAX (min, max);
@ -3133,33 +3147,28 @@ gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
config = gst_buffer_pool_get_config (obj->pool);
if (obj->need_video_meta) {
GST_DEBUG_OBJECT (pool, "activate Video Meta");
GST_DEBUG_OBJECT (obj->element, "activate Video Meta");
gst_buffer_pool_config_add_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_META);
}
if (obj->need_crop_meta) {
GST_DEBUG_OBJECT (pool, "activate VideoCrop Meta");
GST_DEBUG_OBJECT (obj->element, "activate VideoCrop Meta");
gst_buffer_pool_config_add_option (config,
GST_V4L2_BUFFER_POOL_OPTION_CROP_META);
}
/* If pushing from our own pool, configure it with queried minimum,
* otherwise use the minimum required */
if (pushing_from_our_pool)
extra += min;
else
extra += GST_V4L2_MIN_BUFFERS;
gst_buffer_pool_config_set_params (config, caps, size, own_min, 0);
gst_buffer_pool_config_set_params (config, caps, size, extra, 0);
GST_DEBUG_OBJECT (pool, "setting config %" GST_PTR_FORMAT, config);
GST_DEBUG_OBJECT (obj->element, "setting own pool config to %"
GST_PTR_FORMAT, config);
/* Our pool often need to adjust the value */
if (!gst_buffer_pool_set_config (obj->pool, config)) {
config = gst_buffer_pool_get_config (obj->pool);
GST_DEBUG_OBJECT (pool, "config changed to %" GST_PTR_FORMAT, config);
GST_DEBUG_OBJECT (obj->element, "own pool config changed to %"
GST_PTR_FORMAT, config);
/* our pool will adjust the maximum buffer, which we are fine with */
@ -3180,9 +3189,12 @@ setup_other_pool:
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, caps, size, min, max);
GST_DEBUG_OBJECT (obj->element, "setting other pool config to %"
GST_PTR_FORMAT, config);
/* if downstream supports video metadata, add this to the pool config */
if (has_video_meta) {
GST_DEBUG_OBJECT (pool, "activate Video Meta");
GST_DEBUG_OBJECT (obj->element, "activate Video Meta");
gst_buffer_pool_config_add_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_META);
}