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pbutils: descriptions: use subsampling factor to get YUV subsampling

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The algorithm used to determine the YUV subsampling string uses width and height
subsampling factor, not the raw subsampling. Otherwise all 4:2:0 YUV frames will
be detected as 4:4:4

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7360>
This commit is contained in:
Víctor Manuel Jáquez Leal 2024-08-14 10:51:13 +02:00 committed by Backport Bot
parent 419e541199
commit 93be216910
2 changed files with 29 additions and 2 deletions
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4
subprojects/gst-plugins-base/gst-libs/gst/pbutils/descriptions.c
View file

@ -471,8 +471,8 @@ format_info_get_desc (const FormatInfo * info, const GstCaps * caps)
const gchar *subs;
gint w_sub, h_sub, n_semi;
w_sub = GST_VIDEO_FORMAT_INFO_W_SUB (finfo, 1);
h_sub = GST_VIDEO_FORMAT_INFO_H_SUB (finfo, 1);
w_sub = 1 << GST_VIDEO_FORMAT_INFO_W_SUB (finfo, 1);
h_sub = 1 << GST_VIDEO_FORMAT_INFO_H_SUB (finfo, 1);
if (w_sub == 1 && h_sub == 1) {
subs = "4:4:4";

27
subprojects/gst-plugins-base/tests/check/libs/pbutils.c
View file

@ -453,10 +453,36 @@ static const gchar *caps_strings[] = {
/* raw video */
"video/x-raw, format=(string)RGB16, width=(int)320, height=(int)240, framerate=(fraction)30/1, pixel-aspect-ratio=(fraction)1/1",
"video/x-raw, format=(string)YUY2, width=(int)320, height=(int)240, framerate=(fraction)30/1",
"video/x-raw, format=(string)I420, width=(int)320, height=(int)240, framerate=(fraction)30/1",
"video/x-raw, format=(string)AYUV, width=(int)320, height=(int)240, framerate=(fraction)30/1",
/* and a made-up format */
"video/x-tpm"
};
static gboolean
validate_video_subsampling (GstCaps * caps, gchar * desc)
{
GstStructure *st;
const gchar *format;
st = gst_caps_get_structure (caps, 0);
if (!gst_structure_has_name (st, "video/x-raw"))
return TRUE;
format = gst_structure_get_string (st, "format");
if (!format)
return TRUE;
if (g_strcmp0 (format, "YUY2") == 0)
return g_str_has_suffix (desc, "4:2:2");
if (g_strcmp0 (format, "I420") == 0)
return g_str_has_suffix (desc, "4:2:0");
if (g_strcmp0 (format, "AYUV") == 0)
return g_str_has_suffix (desc, "4:4:4");
return TRUE;
}
GST_START_TEST (test_pb_utils_get_codec_description)
{
gint i;
@ -475,6 +501,7 @@ GST_START_TEST (test_pb_utils_get_codec_description)
fail_unless (desc != NULL);
GST_LOG (" - codec : %s", desc);
fail_unless (g_utf8_validate (desc, -1, NULL));
fail_unless (validate_video_subsampling (caps, desc));
g_free (desc);
desc = gst_pb_utils_get_decoder_description (caps);
fail_unless (desc != NULL);