[PATCH] v4l2-tracer: add support for most basic controls

[Hans Verkuil <hverkuil-cisco@xs4all.nl>]

The v4l2-tracer utility didn't support tracing simple controls without
a payload (i.e. the 'size' field is 0) and just a simple value.

This adds support for that, plus the four standard INTEGER64 controls
that use field value64.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
Hi Deb,

I think this is a nice addition for your v3 patch. Support for these
common simple controls is easy to add, and it makes for much better
tracing.

	Hans
---
diff --git a/utils/v4l2-tracer/retrace.cpp b/utils/v4l2-tracer/retrace.cpp
index b736e835..f0353988 100644
--- a/utils/v4l2-tracer/retrace.cpp
+++ b/utils/v4l2-tracer/retrace.cpp
@@ -734,7 +734,23 @@ struct v4l2_ext_control *retrace_v4l2_ext_control(json_object *parent_obj, int c
 		p->value = retrace_v4l2_ext_control_value(v4l2_ext_control_obj,
 		                                          v4l2_stateless_hevc_start_code_val_def);
 		break;
+	case V4L2_CID_MPEG_VIDEO_DEC_PTS:
+	case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
+	case V4L2_CID_MPEG_VIDEO_DEC_CONCEAL_COLOR:
+	case V4L2_CID_PIXEL_RATE: {
+		json_object *value64_obj;
+
+		if (json_object_object_get_ex(v4l2_ext_control_obj, "value64", &value64_obj))
+			p->value64 = json_object_get_int64(value64_obj);
+		break;
+	}
 	default:
+		if (!p->size) {
+			json_object *value_obj;
+
+			if (json_object_object_get_ex(v4l2_ext_control_obj, "value", &value_obj))
+				p->value = json_object_get_int64(value_obj);
+		}
 		break;
 	}

diff --git a/utils/v4l2-tracer/trace.cpp b/utils/v4l2-tracer/trace.cpp
index f0bd7002..e26d6e6d 100644
--- a/utils/v4l2-tracer/trace.cpp
+++ b/utils/v4l2-tracer/trace.cpp
@@ -405,9 +405,19 @@ void trace_v4l2_ext_control(void *arg, json_object *parent_obj, std::string key_
 	case V4L2_CID_STATELESS_MPEG2_QUANTISATION:
 		trace_v4l2_ctrl_mpeg2_quantisation_gen(p->p_mpeg2_quantisation, v4l2_ext_control_obj);
 		break;
+	case V4L2_CID_MPEG_VIDEO_DEC_PTS:
+	case V4L2_CID_MPEG_VIDEO_DEC_FRAME:
+	case V4L2_CID_MPEG_VIDEO_DEC_CONCEAL_COLOR:
+	case V4L2_CID_PIXEL_RATE:
+		json_object_object_add(v4l2_ext_control_obj, "value64", json_object_new_uint64(p->value64));
+		break;
 	default:
-		fprintf(stderr, "%s:%s:%d: ", __FILE__, __func__, __LINE__);
-		fprintf(stderr, "warning: cannot trace control: %s\n", val2s(p->id, control_val_def).c_str());
+		if (p->size) {
+			fprintf(stderr, "%s:%s:%d: ", __FILE__, __func__, __LINE__);
+			fprintf(stderr, "warning: cannot trace control: %s\n", val2s(p->id, control_val_def).c_str());
+		} else {
+			json_object_object_add(v4l2_ext_control_obj, "value", json_object_new_uint64(p->value));
+		}
 		break;
 	}