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Commit 25738cbd authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Mauro Carvalho Chehab
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[media] uvcvideo: Extract timestamp-related statistics 

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 7bc5edb0
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Showing with 146 additions and 2 deletions
drivers/media/video/uvc/uvc_video.c
View file @ 25738cbd
......@@ -365,6 +365,11 @@ static void uvc_video_stats_decode(struct uvc_streaming *stream,
const __u8 *data, int len)
{
unsigned int header_size;
bool has_pts = false;
bool has_scr = false;
u16 uninitialized_var(scr_sof);
u32 uninitialized_var(scr_stc);
u32 uninitialized_var(pts);
if (stream->stats.stream.nb_frames == 0 &&
stream->stats.frame.nb_packets == 0)
......@@ -373,12 +378,16 @@ static void uvc_video_stats_decode(struct uvc_streaming *stream,
switch (data[1] & (UVC_STREAM_PTS | UVC_STREAM_SCR)) {
case UVC_STREAM_PTS | UVC_STREAM_SCR:
header_size = 12;
has_pts = true;
has_scr = true;
break;
case UVC_STREAM_PTS:
header_size = 6;
has_pts = true;
break;
case UVC_STREAM_SCR:
header_size = 8;
has_scr = true;
break;
default:
header_size = 2;
......@@ -391,6 +400,63 @@ static void uvc_video_stats_decode(struct uvc_streaming *stream,
return;
}
/* Extract the timestamps. */
if (has_pts)
pts = get_unaligned_le32(&data[2]);
if (has_scr) {
scr_stc = get_unaligned_le32(&data[header_size - 6]);
scr_sof = get_unaligned_le16(&data[header_size - 2]);
}
/* Is PTS constant through the whole frame ? */
if (has_pts && stream->stats.frame.nb_pts) {
if (stream->stats.frame.pts != pts) {
stream->stats.frame.nb_pts_diffs++;
stream->stats.frame.last_pts_diff =
stream->stats.frame.nb_packets;
}
}
if (has_pts) {
stream->stats.frame.nb_pts++;
stream->stats.frame.pts = pts;
}
/* Do all frames have a PTS in their first non-empty packet, or before
* their first empty packet ?
*/
if (stream->stats.frame.size == 0) {
if (len > header_size)
stream->stats.frame.has_initial_pts = has_pts;
if (len == header_size && has_pts)
stream->stats.frame.has_early_pts = true;
}
/* Do the SCR.STC and SCR.SOF fields vary through the frame ? */
if (has_scr && stream->stats.frame.nb_scr) {
if (stream->stats.frame.scr_stc != scr_stc)
stream->stats.frame.nb_scr_diffs++;
}
if (has_scr) {
/* Expand the SOF counter to 32 bits and store its value. */
if (stream->stats.stream.nb_frames > 0 ||
stream->stats.frame.nb_scr > 0)
stream->stats.stream.scr_sof_count +=
(scr_sof - stream->stats.stream.scr_sof) % 2048;
stream->stats.stream.scr_sof = scr_sof;
stream->stats.frame.nb_scr++;
stream->stats.frame.scr_stc = scr_stc;
stream->stats.frame.scr_sof = scr_sof;
if (scr_sof < stream->stats.stream.min_sof)
stream->stats.stream.min_sof = scr_sof;
if (scr_sof > stream->stats.stream.max_sof)
stream->stats.stream.max_sof = scr_sof;
}
/* Record the first non-empty packet number. */
if (stream->stats.frame.size == 0 && len > header_size)
stream->stats.frame.first_data = stream->stats.frame.nb_packets;
......@@ -411,9 +477,16 @@ static void uvc_video_stats_update(struct uvc_streaming *stream)
{
struct uvc_stats_frame *frame = &stream->stats.frame;
uvc_trace(UVC_TRACE_STATS, "frame %u stats: %u/%u/%u packets\n",
uvc_trace(UVC_TRACE_STATS, "frame %u stats: %u/%u/%u packets, "
"%u/%u/%u pts (%searly %sinitial), %u/%u scr, "
"last pts/stc/sof %u/%u/%u\n",
stream->sequence, frame->first_data,
frame->nb_packets - frame->nb_empty, frame->nb_packets);
frame->nb_packets - frame->nb_empty, frame->nb_packets,
frame->nb_pts_diffs, frame->last_pts_diff, frame->nb_pts,
frame->has_early_pts ? "" : "!",
frame->has_initial_pts ? "" : "!",
frame->nb_scr_diffs, frame->nb_scr,
frame->pts, frame->scr_stc, frame->scr_sof);
stream->stats.stream.nb_frames++;
stream->stats.stream.nb_packets += stream->stats.frame.nb_packets;
......@@ -421,14 +494,47 @@ static void uvc_video_stats_update(struct uvc_streaming *stream)
stream->stats.stream.nb_errors += stream->stats.frame.nb_errors;
stream->stats.stream.nb_invalid += stream->stats.frame.nb_invalid;
if (frame->has_early_pts)
stream->stats.stream.nb_pts_early++;
if (frame->has_initial_pts)
stream->stats.stream.nb_pts_initial++;
if (frame->last_pts_diff <= frame->first_data)
stream->stats.stream.nb_pts_constant++;
if (frame->nb_scr >= frame->nb_packets - frame->nb_empty)
stream->stats.stream.nb_scr_count_ok++;
if (frame->nb_scr_diffs + 1 == frame->nb_scr)
stream->stats.stream.nb_scr_diffs_ok++;
memset(&stream->stats.frame, 0, sizeof(stream->stats.frame));
}
size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf,
size_t size)
{
unsigned int scr_sof_freq;
unsigned int duration;
struct timespec ts;
size_t count = 0;
ts.tv_sec = stream->stats.stream.stop_ts.tv_sec
- stream->stats.stream.start_ts.tv_sec;
ts.tv_nsec = stream->stats.stream.stop_ts.tv_nsec
- stream->stats.stream.start_ts.tv_nsec;
if (ts.tv_nsec < 0) {
ts.tv_sec--;
ts.tv_nsec += 1000000000;
}
/* Compute the SCR.SOF frequency estimate. At the nominal 1kHz SOF
* frequency this will not overflow before more than 1h.
*/
duration = ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
if (duration != 0)
scr_sof_freq = stream->stats.stream.scr_sof_count * 1000
/ duration;
else
scr_sof_freq = 0;
count += scnprintf(buf + count, size - count,
"frames: %u\npackets: %u\nempty: %u\n"
"errors: %u\ninvalid: %u\n",
......@@ -437,6 +543,20 @@ size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf,
stream->stats.stream.nb_empty,
stream->stats.stream.nb_errors,
stream->stats.stream.nb_invalid);
count += scnprintf(buf + count, size - count,
"pts: %u early, %u initial, %u ok\n",
stream->stats.stream.nb_pts_early,
stream->stats.stream.nb_pts_initial,
stream->stats.stream.nb_pts_constant);
count += scnprintf(buf + count, size - count,
"scr: %u count ok, %u diff ok\n",
stream->stats.stream.nb_scr_count_ok,
stream->stats.stream.nb_scr_diffs_ok);
count += scnprintf(buf + count, size - count,
"sof: %u <= sof <= %u, freq %u.%03u kHz\n",
stream->stats.stream.min_sof,
stream->stats.stream.max_sof,
scr_sof_freq / 1000, scr_sof_freq % 1000);
return count;
}
......@@ -444,6 +564,7 @@ size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf,
static void uvc_video_stats_start(struct uvc_streaming *stream)
{
memset(&stream->stats, 0, sizeof(stream->stats));
stream->stats.stream.min_sof = 2048;
}
static void uvc_video_stats_stop(struct uvc_streaming *stream)
......
drivers/media/video/uvc/uvcvideo.h
View file @ 25738cbd
......@@ -364,6 +364,18 @@ struct uvc_stats_frame {
unsigned int nb_empty; /* Number of empty packets */
unsigned int nb_invalid; /* Number of packets with an invalid header */
unsigned int nb_errors; /* Number of packets with the error bit set */
unsigned int nb_pts; /* Number of packets with a PTS timestamp */
unsigned int nb_pts_diffs; /* Number of PTS differences inside a frame */
unsigned int last_pts_diff; /* Index of the last PTS difference */
bool has_initial_pts; /* Whether the first non-empty packet has a PTS */
bool has_early_pts; /* Whether a PTS is present before the first non-empty packet */
u32 pts; /* PTS of the last packet */
unsigned int nb_scr; /* Number of packets with a SCR timestamp */
unsigned int nb_scr_diffs; /* Number of SCR.STC differences inside a frame */
u16 scr_sof; /* SCR.SOF of the last packet */
u32 scr_stc; /* SCR.STC of the last packet */
};
struct uvc_stats_stream {
......@@ -376,6 +388,17 @@ struct uvc_stats_stream {
unsigned int nb_empty; /* Number of empty packets */
unsigned int nb_invalid; /* Number of packets with an invalid header */
unsigned int nb_errors; /* Number of packets with the error bit set */
unsigned int nb_pts_constant; /* Number of frames with constant PTS */
unsigned int nb_pts_early; /* Number of frames with early PTS */
unsigned int nb_pts_initial; /* Number of frames with initial PTS */
unsigned int nb_scr_count_ok; /* Number of frames with at least one SCR per non empty packet */
unsigned int nb_scr_diffs_ok; /* Number of frames with varying SCR.STC */
unsigned int scr_sof_count; /* STC.SOF counter accumulated since stream start */
unsigned int scr_sof; /* STC.SOF of the last packet */
unsigned int min_sof; /* Minimum STC.SOF value */
unsigned int max_sof; /* Maximum STC.SOF value */
};
struct uvc_streaming {
......
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