[Linux-kernel-mentees] [PATCH v3] v4l2-ctl: Print UVC meta info

Vandana BN bnvandana at gmail.com
Mon Sep 16 18:00:43 UTC 2019


Print UVC Metadata information in verbose mode.

Signed-off-by: Vandana BN <bnvandana at gmail.com>
---
Changes since v2
- Converted if to switch statement.
- Corrected format specifier in print.
---
 utils/v4l2-ctl/v4l2-ctl-meta.cpp      | 25 +++++++++++++++++++++++++
 utils/v4l2-ctl/v4l2-ctl-streaming.cpp | 14 ++++++++------
 utils/v4l2-ctl/v4l2-ctl.h             |  1 +
 3 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/utils/v4l2-ctl/v4l2-ctl-meta.cpp b/utils/v4l2-ctl/v4l2-ctl-meta.cpp
index 75fbd6f4..5d7b28d6 100644
--- a/utils/v4l2-ctl/v4l2-ctl-meta.cpp
+++ b/utils/v4l2-ctl/v4l2-ctl-meta.cpp
@@ -127,3 +127,28 @@ void meta_list(cv4l_fd &fd)
 		print_video_formats(fd, V4L2_BUF_TYPE_META_OUTPUT);
 	}
 }
+
+struct vivid_uvc_meta_buf {
+	__u64 ns;
+	__u16 sof;
+	__u8 length;
+	__u8 flags;
+	__u8 buf[];
+};
+
+void print_meta_buffer(FILE *f, cv4l_buffer &buf, cv4l_fmt &fmt, cv4l_queue &q)
+{
+	struct vivid_uvc_meta_buf *vbuf;
+
+	switch(fmt.g_pixelformat()) {
+		case V4L2_META_FMT_UVC:
+			fprintf(f, "UVC: ");
+			for (unsigned i = 0; i < buf.g_num_planes(); i++) {
+				vbuf = (vivid_uvc_meta_buf *)q.g_dataptr(buf.g_index(), i);
+				fprintf(f, "%.6fs, sof %u, len %u, flags 0x%x\n",
+						(double)vbuf[i].ns / 1000000000.0, vbuf[i].sof,
+						vbuf[i].length, vbuf[i].flags);
+			}
+			break;
+	}
+}
diff --git a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
index 11157434..46d53f23 100644
--- a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
+++ b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
@@ -540,9 +540,9 @@ static void print_buffer(FILE *f, struct v4l2_buffer &buf)
 	fprintf(f, "\n");
 }
 
-static void print_concise_buffer(FILE *f, cv4l_buffer &buf,
-				 fps_timestamps &fps_ts, int comp_perc,
-				 bool skip_ts = false)
+static void print_concise_buffer(FILE *f, cv4l_buffer &buf, cv4l_fmt &fmt,
+				 cv4l_queue &q, fps_timestamps &fps_ts,
+				 int comp_perc, bool skip_ts = false)
 {
 	static double last_ts;
 
@@ -592,6 +592,8 @@ static void print_concise_buffer(FILE *f, cv4l_buffer &buf,
 	if (fl)
 		fprintf(f, " (%s)", bufferflags2s(fl).c_str());
 	fprintf(f, "\n");
+	if (v4l_type_is_meta(buf.g_type()))
+		print_meta_buffer(f, buf, fmt, q);
 }
 
 static void stream_buf_caps(cv4l_fd &fd, unsigned buftype)
@@ -1390,7 +1392,7 @@ static int do_handle_cap(cv4l_fd &fd, cv4l_queue &q, FILE *fout, int *index,
 		if (!(buf.g_flags() & V4L2_BUF_FLAG_ERROR))
 			break;
 		if (verbose)
-			print_concise_buffer(stderr, buf, fps_ts, -1);
+			print_concise_buffer(stderr, buf, fmt, q, fps_ts, -1);
 		if (fd.qbuf(buf))
 			return QUEUE_ERROR;
 	}
@@ -1412,7 +1414,7 @@ static int do_handle_cap(cv4l_fd &fd, cv4l_queue &q, FILE *fout, int *index,
 	else if (buf.g_flags() & V4L2_BUF_FLAG_BFRAME)
 		ch = 'B';
 	if (verbose) {
-		print_concise_buffer(stderr, buf, fps_ts,
+		print_concise_buffer(stderr, buf, fmt, q, fps_ts,
 				     host_fd_to >= 0 ? 100 - comp_perc / comp_perc_count : -1);
 		comp_perc_count = comp_perc = 0;
 	}
@@ -1502,7 +1504,7 @@ static int do_handle_out(cv4l_fd &fd, cv4l_queue &q, FILE *fin, cv4l_buffer *cap
 		double ts_secs = buf.g_timestamp().tv_sec + buf.g_timestamp().tv_usec / 1000000.0;
 		fps_ts.add_ts(ts_secs, buf.g_sequence(), buf.g_field());
 		if (verbose)
-			print_concise_buffer(stderr, buf, fps_ts, -1);
+			print_concise_buffer(stderr, buf, fmt, q, fps_ts, -1);
 
 		for (unsigned j = 0; j < buf.g_num_planes(); j++)
 			buf.s_bytesused(buf.g_length(j), j);
diff --git a/utils/v4l2-ctl/v4l2-ctl.h b/utils/v4l2-ctl/v4l2-ctl.h
index 5797d784..36051566 100644
--- a/utils/v4l2-ctl/v4l2-ctl.h
+++ b/utils/v4l2-ctl/v4l2-ctl.h
@@ -406,6 +406,7 @@ void meta_cmd(int ch, char *optarg);
 void meta_set(cv4l_fd &fd);
 void meta_get(cv4l_fd &fd);
 void meta_list(cv4l_fd &fd);
+void print_meta_buffer(FILE *f, cv4l_buffer &buf, cv4l_fmt &fmt, cv4l_queue &q);
 
 // v4l2-ctl-subdev.cpp
 void subdev_usage(void);
-- 
2.17.1



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