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gst: utils: Add StreamConfiguration helpers

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This adds helpers to deal with the conversion from StreamConfiguration
to caps and vice-versa. This is needed to implement caps negotiation.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Nicolas Dufresne 2020-01-22 15:06:37 -05:00 • committed by Laurent Pinchart
parent e5f4398c19
commit bd0c2df110
2 changed files with 67 additions and 0 deletions
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64
src/gstreamer/gstlibcamera-utils.cpp
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@ -42,6 +42,18 @@ drm_to_gst_format(guint drm_fourcc)
return GST_VIDEO_FORMAT_UNKNOWN;
}
static guint
gst_format_to_drm(GstVideoFormat gst_format)
{
if (gst_format == GST_VIDEO_FORMAT_ENCODED)
return DRM_FORMAT_INVALID;
for (const auto &item : format_map)
if (item.gst_format == gst_format)
return item.drm_fourcc;
return DRM_FORMAT_INVALID;
}
static GstStructure *
bare_structure_from_fourcc(guint fourcc)
{
@ -103,3 +115,55 @@ gst_libcamera_stream_formats_to_caps(const StreamFormats &formats)
return caps;
}
GstCaps *
gst_libcamera_stream_configuration_to_caps(const StreamConfiguration &stream_cfg)
{
GstCaps *caps = gst_caps_new_empty();
GstStructure *s = bare_structure_from_fourcc(stream_cfg.pixelFormat);
gst_structure_set(s,
"width", G_TYPE_INT, stream_cfg.size.width,
"height", G_TYPE_INT, stream_cfg.size.height,
nullptr);
gst_caps_append_structure(caps, s);
return caps;
}
void
gst_libcamera_configure_stream_from_caps(StreamConfiguration &stream_cfg,
GstCaps *caps)
{
GstVideoFormat gst_format = drm_to_gst_format(stream_cfg.pixelFormat);
/* First fixate the caps using default configuration value. */
g_assert(gst_caps_is_writable(caps));
caps = gst_caps_truncate(caps);
GstStructure *s = gst_caps_get_structure(caps, 0);
gst_structure_fixate_field_nearest_int(s, "width", stream_cfg.size.width);
gst_structure_fixate_field_nearest_int(s, "height", stream_cfg.size.height);
if (gst_structure_has_name(s, "video/x-raw")) {
const gchar *format = gst_video_format_to_string(gst_format);
gst_structure_fixate_field_string(s, "format", format);
}
/* Then configure the stream with the result. */
if (gst_structure_has_name(s, "video/x-raw")) {
const gchar *format = gst_structure_get_string(s, "format");
gst_format = gst_video_format_from_string(format);
stream_cfg.pixelFormat = gst_format_to_drm(gst_format);
} else if (gst_structure_has_name(s, "image/jpeg")) {
stream_cfg.pixelFormat = DRM_FORMAT_MJPEG;
} else {
g_critical("Unsupported media type: %s", gst_structure_get_name(s));
}
gint width, height;
gst_structure_get_int(s, "width", &width);
gst_structure_get_int(s, "height", &height);
stream_cfg.size.width = width;
stream_cfg.size.height = height;
}