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cam: Print timestamp of captured buffers

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Print the timestamp of the captured buffer in addition to the frame
rate, as this is more precise information that can help debugging issue.
The log changes from

Using camera \_SB_.PCI0.XHC_.RHUB.HS05-5:1.0-0bda:58f4
Capture until user interrupts by SIGINT
fps: 0.00 stream0 seq: 000000 bytesused: 169968
fps: 28.57 stream0 seq: 000002 bytesused: 170352
fps: 31.25 stream0 seq: 000003 bytesused: 170428
fps: 32.26 stream0 seq: 000004 bytesused: 170672
fps: 27.78 stream0 seq: 000005 bytesused: 170568

to

Using camera \_SB_.PCI0.XHC_.RHUB.HS05-5:1.0-0bda:58f4
Capture until user interrupts by SIGINT
93473.942525 (0.00 fps) stream0 seq: 000000 bytesused: 183940
93474.006528 (15.62 fps) stream0 seq: 000002 bytesused: 183512
93474.038525 (31.25 fps) stream0 seq: 000003 bytesused: 183760
93474.074530 (27.77 fps) stream0 seq: 000004 bytesused: 182704
93474.106581 (31.20 fps) stream0 seq: 000005 bytesused: 182768

While at it, compute the frame rate on the buffer timestamps instead of
sampling the clock in the request completion handler.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
This commit is contained in:
Laurent Pinchart 2020-08-17 00:58:02 +03:00
parent de012767e7
commit da3c15c3de
2 changed files with 13 additions and 9 deletions
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18
src/cam/capture.cpp
View file

@ -5,7 +5,6 @@
* capture.cpp - Cam capture
*/
#include <chrono>
#include <iomanip>
#include <iostream>
#include <limits.h>
@ -159,14 +158,19 @@ void Capture::requestComplete(Request *request)
const Request::BufferMap &buffers = request->buffers();
std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now();
double fps = std::chrono::duration_cast<std::chrono::milliseconds>(now - last_).count();
fps = last_ != std::chrono::steady_clock::time_point() && fps
? 1000.0 / fps : 0.0;
last_ = now;
/*
* Compute the frame rate. The timestamp is arbitrarily retrieved from
* the first buffer, as all buffers should have matching timestamps.
*/
uint64_t ts = buffers.begin()->second->metadata().timestamp;
double fps = ts - last_;
fps = last_ != 0 && fps ? 1000000000.0 / fps : 0.0;
last_ = ts;
std::stringstream info;
info << "fps: " << std::fixed << std::setprecision(2) << fps;
info << ts / 1000000000 << "."
<< std::setw(6) << std::setfill('0') << ts / 1000 % 1000000
<< " (" << std::fixed << std::setprecision(2) << fps << " fps)";
for (auto it = buffers.begin(); it != buffers.end(); ++it) {
const Stream *stream = it->first;