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v4l2object: try matching buffer layout from downstream

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Ask v4l2 to produce buffers matching the buffer layout requested
downstream.
This commit is contained in:
Guillaume Desmottes 2019-05-23 10:49:39 +02:00
parent 31c753a3fb
commit 91002389b9
1 changed files with 84 additions and 1 deletions
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85
sys/v4l2/gstv4l2object.c
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@ -4456,6 +4456,79 @@ gst_v4l2_object_match_buffer_layout (GstV4l2Object * obj, guint n_planes,
return TRUE;
}
static gboolean
validate_video_meta_struct (GstV4l2Object * obj, const GstStructure * s)
{
guint i;
for (i = 0; i < gst_structure_n_fields (s); i++) {
const gchar *name = gst_structure_nth_field_name (s, i);
if (!g_str_equal (name, "padding-top")
&& !g_str_equal (name, "padding-bottom")
&& !g_str_equal (name, "padding-left")
&& !g_str_equal (name, "padding-right")) {
GST_WARNING_OBJECT (obj->dbg_obj, "Unknown video meta field: '%s'", name);
return FALSE;
}
}
return TRUE;
}
static gboolean
gst_v4l2_object_match_buffer_layout_from_struct (GstV4l2Object * obj,
const GstStructure * s, GstCaps * caps, guint buffer_size)
{
GstVideoInfo info;
GstVideoAlignment align;
gsize plane_size[GST_VIDEO_MAX_PLANES];
if (!validate_video_meta_struct (obj, s))
return FALSE;
if (!gst_video_info_from_caps (&info, caps)) {
GST_WARNING_OBJECT (obj->dbg_obj, "Failed to create video info");
return FALSE;
}
gst_video_alignment_reset (&align);
gst_structure_get_uint (s, "padding-top", &align.padding_top);
gst_structure_get_uint (s, "padding-bottom", &align.padding_bottom);
gst_structure_get_uint (s, "padding-left", &align.padding_left);
gst_structure_get_uint (s, "padding-right", &align.padding_right);
if (align.padding_top || align.padding_bottom || align.padding_left ||
align.padding_right) {
GST_DEBUG_OBJECT (obj->dbg_obj,
"Upstream requested padding (top: %d bottom: %d left: %d right: %d)",
align.padding_top, align.padding_bottom, align.padding_left,
align.padding_right);
}
if (!gst_video_info_align_full (&info, &align, plane_size)) {
GST_WARNING_OBJECT (obj->dbg_obj, "Failed to align video info");
return FALSE;
}
if (GST_VIDEO_INFO_SIZE (&info) != buffer_size) {
GST_WARNING_OBJECT (obj->dbg_obj,
"Requested buffer size (%d) doesn't match video info size (%"
G_GSIZE_FORMAT ")", buffer_size, GST_VIDEO_INFO_SIZE (&info));
return FALSE;
}
GST_DEBUG_OBJECT (obj->dbg_obj,
"try matching buffer layout requested by downstream");
gst_v4l2_object_match_buffer_layout (obj, GST_VIDEO_INFO_N_PLANES (&info),
info.offset, info.stride, buffer_size,
GST_VIDEO_INFO_PLANE_HEIGHT (&info, 0, plane_size));
return TRUE;
}
gboolean
gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
{
@ -4468,6 +4541,7 @@ gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
gboolean can_share_own_pool, pushing_from_our_pool = FALSE;
GstAllocator *allocator = NULL;
GstAllocationParams params = { 0 };
guint video_idx;
GST_DEBUG_OBJECT (obj->dbg_obj, "decide allocation");
@ -4498,7 +4572,16 @@ gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
GST_PTR_FORMAT, size, min, max, pool);
has_video_meta =
gst_query_find_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
gst_query_find_allocation_meta (query, GST_VIDEO_META_API_TYPE,
&video_idx);
if (has_video_meta) {
const GstStructure *params;
gst_query_parse_nth_allocation_meta (query, video_idx, &params);
if (params)
gst_v4l2_object_match_buffer_layout_from_struct (obj, params, caps, size);
}
can_share_own_pool = (has_video_meta || !obj->need_video_meta);