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video-format: add gst_video_format_info_component()

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New API to find out which components are packed in a given plane.
Will prevent us from assuming a 1-1 mapping between planes and
components.
This commit is contained in:
Guillaume Desmottes 2019-07-16 12:23:01 +02:00
parent c854c270be
commit 509d4c31f0
3 changed files with 123 additions and 0 deletions
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30
gst-libs/gst/video/video-format.c
View file

@ -6101,3 +6101,33 @@ gst_video_format_get_palette (GstVideoFormat format, gsize * size)
return NULL;
}
}
/**
* gst_video_format_info_component:
* @info: #GstVideoFormatInfo
* @plane: a plane number
* @components: (out): array used to store component numbers
*
* Fill @components with the number of all the components packed in plane @p
* for the format @info. A value of -1 in @components indicates that no more
* components are packed in the plane.
*
* Since: 1.18
*/
void
gst_video_format_info_component (const GstVideoFormatInfo * info, guint plane,
gint components[GST_VIDEO_MAX_COMPONENTS])
{
guint c, i = 0;
/* Reverse mapping of info->plane */
for (c = 0; c < GST_VIDEO_FORMAT_INFO_N_COMPONENTS (info); c++) {
if (GST_VIDEO_FORMAT_INFO_PLANE (info, c) == plane) {
components[i] = c;
i++;
}
}
for (c = i; c < GST_VIDEO_MAX_COMPONENTS; c++)
components[c] = -1;
}

3
gst-libs/gst/video/video-format.h
View file

@ -518,6 +518,9 @@ struct _GstVideoFormatInfo {
#define GST_VIDEO_FORMAT_INFO_TILE_WS(info) ((info)->tile_ws)
#define GST_VIDEO_FORMAT_INFO_TILE_HS(info) ((info)->tile_hs)
GST_VIDEO_API
void gst_video_format_info_component (const GstVideoFormatInfo *info, guint plane, gint components[GST_VIDEO_MAX_COMPONENTS]);
/* format properties */
GST_VIDEO_API

90
tests/check/libs/video.c
View file

@ -3214,6 +3214,95 @@ GST_START_TEST (test_video_color_from_to_iso)
GST_END_TEST;
GST_START_TEST (test_video_format_info_plane_to_components)
{
const GstVideoFormatInfo *info;
gint comps[GST_VIDEO_MAX_COMPONENTS];
/* RGB: 1 plane, 3 components */
info = gst_video_format_get_info (GST_VIDEO_FORMAT_RGB);
gst_video_format_info_component (info, 0, comps);
g_assert_cmpint (comps[0], ==, 0);
g_assert_cmpint (comps[1], ==, 1);
g_assert_cmpint (comps[2], ==, 2);
g_assert_cmpint (comps[3], ==, -1);
gst_video_format_info_component (info, 1, comps);
g_assert_cmpint (comps[0], ==, -1);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
gst_video_format_info_component (info, 2, comps);
g_assert_cmpint (comps[0], ==, -1);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
gst_video_format_info_component (info, 3, comps);
g_assert_cmpint (comps[0], ==, -1);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
/* I420: 3 planes, 3 components */
info = gst_video_format_get_info (GST_VIDEO_FORMAT_I420);
gst_video_format_info_component (info, 0, comps);
g_assert_cmpint (comps[0], ==, 0);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
gst_video_format_info_component (info, 1, comps);
g_assert_cmpint (comps[0], ==, 1);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
gst_video_format_info_component (info, 2, comps);
g_assert_cmpint (comps[0], ==, 2);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
gst_video_format_info_component (info, 3, comps);
g_assert_cmpint (comps[0], ==, -1);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
/* NV12: 2 planes, 3 components */
info = gst_video_format_get_info (GST_VIDEO_FORMAT_NV12);
gst_video_format_info_component (info, 0, comps);
g_assert_cmpint (comps[0], ==, 0);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
gst_video_format_info_component (info, 1, comps);
g_assert_cmpint (comps[0], ==, 1);
g_assert_cmpint (comps[1], ==, 2);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
gst_video_format_info_component (info, 2, comps);
g_assert_cmpint (comps[0], ==, -1);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
gst_video_format_info_component (info, 3, comps);
g_assert_cmpint (comps[0], ==, -1);
g_assert_cmpint (comps[1], ==, -1);
g_assert_cmpint (comps[2], ==, -1);
g_assert_cmpint (comps[3], ==, -1);
}
GST_END_TEST;
static Suite *
video_suite (void)
{
@ -3261,6 +3350,7 @@ video_suite (void)
tcase_add_test (tc_chain, test_video_formats_pstrides);
tcase_add_test (tc_chain, test_hdr);
tcase_add_test (tc_chain, test_video_color_from_to_iso);
tcase_add_test (tc_chain, test_video_format_info_plane_to_components);
return s;
}