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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
2<html>
3<head>
4  <meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
5  <title>v4l-test: Test environment for Video For Linux Two (V4L2) API</title>
6</head>
7<body>
8<p>
9<a href="#what">What is this?</a> |
10<a href="#build">How to build?</a> |
11<a href="#run">How to run?</a> |
12<a href="#v4l2">V4L2</a> |
13<a href="#code_coverage">Code Coverage</a> |
14<a href="#status">Status</a> |
15<a href="results.html">Results</a> |
16<a href="#others">Similar projects</a> |
17<a href="#feedback">Feedback</a><br>
18</p>
19<hr style="width: 100%; height: 2px;">
20
21<h1>v4l-test: Test environment for Video For Linux Two (V4L2) API</h1>
22<p>
23Download <a href="http://sourceforge.net/project/showfiles.php?group_id=247983">v4l-test</a>
24or visit <a href="http://sourceforge.net/projects/v4l-test/">v4l-test project page</a> at
25<a href="http://sourceforge.net">sourceforge.net</a> .
26</p>
27
28<h2><a name="what">What is this?</a></h2>
29<p>
30v4l-test is a test environment for V4L2 drivers. The V4L2 drivers
31are running under Linux in kernel space. This test environment is
32running in userspace and tries what normal video application would do.
33It also tries some things which are supposed to test the error handling
34mechanisms of a V4L2 driver. These are the "invalid test cases".
35</p>
36<p>
37The V4L2 API only covers webcams and analog tuner cards. The digital
38broadcast is out of the scope of V4L2 API so it is also out of the
39scope of this test environment. See
40<a href="http://linuxtv.org/docs/dvbapi/dvbapi.html">Linux DVB API</a>
41for digital broadcast and
42<a href="spec/x16430.htm">Chapter 6.3 Relation of V4L2 to other Linux
43multimedia APIs</a> in V4L2 specification.
44</p>
45
46<h2><a name="build">How to build?</a></h2>
47<p>
48To build the test environment you will need a C compiler, "make" and
49the CUnit development files installed. Just type "make" and the test
50environment is ready.
51</p>
52
53<h2><a name="run">How to run?</a></h2>
54<p>
55You need to have a video device (i.e. webcam, tuner card, etc.)
56connected to your system and available under /dev/video0. If you don't
57have any hardware device available, you can still test the "Virtual
58Video Driver". To compile this you need to compile your kernel with
59CONFIG_VIDEO_VIVI=m under:
60</p>
61<pre>
62  -&gt; Device Drivers
63    -&gt; Multimedia devices
64      -&gt; Video For Linux
65        -&gt; Video capture adapters
66          -&gt; Virtual Video Driver
67</pre>
68<p>
69At this point you can execute v4l-test.
70</p>
71
72<h2><a name="v4l2">Video for Linux Two Specification</a></h2>
73<p>
74The <a href="spec/index.html">V4L2 API specification</a>
75revision 0.24 is the base for this test environment. The most recent
76version can be found at
77<a href="http://v4l2spec.bytesex.org/spec/">http://v4l2spec.bytesex.org/spec/</a> .
78</p>
79
80<h2><a name="code_coverage">Code Coverage</a></h2>
81<p>
82The code coverage shows which lines of the code were executed and how
83many times. The measurement results gives you a feedback about the
84quality of the test cases. You can measure the code coverage of a
85kernel module with the
86<a href="http://ltp.sourceforge.net/coverage/gcov.php">gocv</a> and
87<a href="http://ltp.sourceforge.net/coverage/lcov.php">lcov</a> softwares.
88</p>
89
90<h2><a name="status">Current status</a></h2>
91<p>
92Currently all test are running and evaluated automatically. This might
93change in future if we want to test for example plugging and unplugging
94a USB video device or ask the user if a received picture make sense or
95not.
96</p>
97<p>
98The following tables give an overview about the current state of
99implemented test cases.</p>
100
101<table border="1" cellpadding="2"
102 cellspacing="0">
103  <thead>
104    <tr>
105      <td><b>V4L API element</b></td>
106      <td><b>Covered?</b></td>
107      <td><b>Note</b></td>
108    </tr>
109  </thead>
110  <tbody>
111    <tr>
112      <td>V4L2 <a href="spec/r7626.htm">close()</a></td>
113      <td>yes</td>
114      <td>All</td>
115    </tr>
116    <tr>
117      <td>V4L2 <a href="spec/r7667.htm">ioctl()</a></td>
118      <td>yes</td>
119      <td>All</td>
120    </tr>
121    <tr>
122      <td>ioctl <a href="spec/r7771.htm">VIDIOC_CROPCAP</a></td>
123      <td>yes, only when STREAM_OFF</td>
124      <td>Opt.</td>
125    </tr>
126    <tr>
127      <td>ioctl <a href="spec/r7900.htm">VIDIOC_DBG_G_REGISTER</a></td>
128      <td>no</td>
129      <td><a href="spec/x16453.htm">Exp.</a></td>
130    </tr>
131    <tr>
132      <td>ioctl <a href="spec/r7900.htm">VIDIOC_DBG_S_REGISTER</a></td>
133      <td>no</td>
134      <td><a href="spec/x16453.htm">Exp.</a></td>
135    </tr>
136    <tr>
137      <td>ioctl <a href="spec/r8087.htm">VIDIOC_ENCODER_CMD</a></td>
138      <td>no</td>
139      <td><a href="spec/x16453.htm">Exp.</a></td>
140    </tr>
141    <tr>
142      <td>ioctl <a href="spec/r8087.htm">VIDIOC_TRY_ENCODER_CMD</a></td>
143      <td>no</td>
144      <td><a href="spec/x16453.htm">Exp.</a></td>
145    </tr>
146    <tr>
147      <td>ioctl <a href="spec/r8242.htm">VIDIOC_ENUMAUDIO</a></td>
148      <td>yes, only when STREAM_OFF</td>
149      <td>Enum.</td>
150    </tr>
151    <tr>
152      <td>ioctl <a href="spec/r8304.htm">VIDIOC_ENUMAUDOUT</a></td>
153      <td>yes, only when STREAM_OFF</td>
154      <td>Enum.</td>
155    </tr>
156    <tr>
157      <td>ioctl <a href="spec/r8367.htm">VIDIOC_ENUM_FMT</a></td>
158      <td>yes, only when STREAM_OFF</td>
159      <td>Enum.</td>
160    </tr>
161    <tr>
162      <td>ioctl <a href="spec/r8494.htm">VIDIOC_ENUM_FRAMESIZES</a></td>
163      <td>yes, only when STREAM_OFF</td>
164      <td><a href="spec/x16453.htm">Exp.</a> Enum.</td>
165    </tr>
166    <tr>
167      <td>ioctl <a href="spec/r8724.htm">VIDIOC_ENUM_FRAMEINTERVALS</a></td>
168      <td>no</td>
169      <td><a href="spec/x16453.htm">Exp.</a> Enum.</td>
170    </tr>
171    <tr>
172      <td>ioctl <a href="spec/r8936.htm">VIDIOC_ENUMINPUT</a></td>
173      <td>yes, only when STREAM_OFF</td>
174      <td>Enum.</td>
175    </tr>
176    <tr>
177      <td>ioctl <a href="spec/r9149.htm">VIDIOC_ENUMOUTPUT</a></td>
178      <td>yes, only when STREAM_OFF</td>
179      <td>Enum.</td>
180    </tr>
181    <tr>
182      <td>ioctl <a href="spec/r9288.htm">VIDIOC_ENUMSTD</a></td>
183      <td>yes, only when STREAM_OFF</td>
184      <td>Enum.</td>
185    </tr>
186    <tr>
187      <td>ioctl <a href="spec/r9539.htm">VIDIOC_G_AUDIO</a></td>
188      <td>yes, only when STREAM_OFF</td>
189      <td>Opt.</td>
190    </tr>
191    <tr>
192      <td>ioctl <a href="spec/r9539.htm">VIDIOC_S_AUDIO</a></td>
193      <td>yes, only when STREAM_OFF</td>
194      <td>Opt.</td>
195    </tr>
196    <tr>
197      <td>ioctl <a href="spec/r9688.htm">VIDIOC_G_AUDOUT</a></td>
198      <td>yes, only when STREAM_OFF</td>
199      <td>Opt.</td>
200    </tr>
201    <tr>
202      <td>ioctl <a href="spec/r9688.htm">VIDIOC_S_AUDOUT</a></td>
203      <td>yes, only when STREAM_OFF</td>
204      <td>Opt.</td>
205    </tr>
206    <tr>
207      <td>ioctl <a href="spec/r9804.htm">VIDIOC_G_CHIP_IDENT</a></td>
208      <td>no</td>
209      <td><a href="spec/x16453.htm">Exp.</a></td>
210    </tr>
211    <tr>
212      <td>ioctl <a href="spec/r9994.htm">VIDIOC_G_CROP</a></td>
213      <td>yes, only when STREAM_OFF</td>
214      <td>Opt.</td>
215    </tr>
216    <tr>
217      <td>ioctl <a href="spec/r9994.htm">VIDIOC_S_CROP</a></td>
218      <td>yes, only when STREAM_OFF</td>
219      <td>Opt.</td>
220    </tr>
221    <tr>
222      <td>ioctl <a href="spec/r10104.htm">VIDIOC_G_CTRL</a></td>
223      <td>yes, only when STREAM_OFF</td>
224      <td><br></td>
225    </tr>
226    <tr>
227      <td>ioctl <a href="spec/r10104.htm">VIDIOC_S_CTRL</a></td>
228      <td>yes, only when STREAM_OFF</td>
229      <td><br></td>
230    </tr>
231    <tr>
232      <td>ioctl <a href="spec/r10211.htm">VIDIOC_G_ENC_INDEX</a></td>
233      <td>no</td>
234      <td><a href="spec/x16453.htm">Exp.</a></td>
235    </tr>
236    <tr>
237      <td>ioctl <a href="spec/r10386.htm">VIDIOC_G_EXT_CTRLS</a></td>
238      <td>yes, only when STREAM_OFF, currently only zero and one item</td>
239      <td>Opt.</td>
240    </tr>
241    <tr>
242      <td>ioctl <a href="spec/r10386.htm">VIDIOC_S_EXT_CTRLS</a></td>
243      <td>yes, only when STREAM_OFF, only with zero item</td>
244      <td>Opt.</td>
245    </tr>
246    <tr>
247      <td>ioctl <a href="spec/r10386.htm">VIDIOC_TRY_EXT_CTRLS</a></td>
248      <td>yes, only when STREAM_OFF, only with zero item</td>
249      <td>Opt.</td>
250    </tr>
251    <tr>
252      <td>ioctl <a href="spec/r10595.htm">VIDIOC_G_FBUF</a></td>
253      <td>no</td>
254      <td>Opt.</td>
255    </tr>
256    <tr>
257      <td>ioctl <a href="spec/r10595.htm">VIDIOC_S_FBUF</a></td>
258      <td>no</td>
259      <td>Opt.</td>
260    </tr>
261    <tr>
262      <td>ioctl <a href="spec/r10944.htm">VIDIOC_G_FMT</a></td>
263      <td>yes, only when STREAM_OFF</td>
264      <td>Opt.</td>
265    </tr>
266    <tr>
267      <td>ioctl <a href="spec/r10944.htm">VIDIOC_S_FMT</a></td>
268      <td>yes, only when STREAM_OFF</td>
269      <td>Opt.</td>
270    </tr>
271    <tr>
272      <td>ioctl <a href="spec/r10944.htm">VIDIOC_TRY_FMT</a></td>
273      <td>no</td>
274      <td>Opt.</td>
275    </tr>
276    <tr>
277      <td>ioctl <a href="spec/r11094.htm">VIDIOC_G_FREQUENCY</a></td>
278      <td>yes, only when STREAM_OFF</td>
279      <td>Opt.</td>
280    </tr>
281    <tr>
282      <td>ioctl <a href="spec/r11094.htm">VIDIOC_S_FREQUENCY</a></td>
283      <td>yes, only when STREAM_OFF</td>
284      <td>Opt.</td>
285    </tr>
286    <tr>
287      <td>ioctl <a href="spec/r11217.htm">VIDIOC_G_INPUT</a></td>
288      <td>yes, only when STREAM_OFF</td>
289      <td>Opt.</td>
290    </tr>
291    <tr>
292      <td>ioctl <a href="spec/r11217.htm">VIDIOC_S_INPUT</a></td>
293      <td>yes, only when STREAM_OFF</td>
294      <td>Opt.</td>
295    </tr>
296    <tr>
297      <td>ioctl <a href="spec/r11285.htm">VIDIOC_G_JPEGCOMP</a></td>
298      <td>yes, only when STREAM_OFF</td>
299      <td>Opt.</td>
300    </tr>
301    <tr>
302      <td>ioctl <a href="spec/r11285.htm">VIDIOC_S_JPEGCOMP</a></td>
303      <td>no</td>
304      <td>Opt.</td>
305    </tr>
306    <tr>
307      <td>ioctl <a href="spec/r11430.htm">VIDIOC_G_MODULATOR</a></td>
308      <td>yes, only when STREAM_OFF</td>
309      <td>Opt.</td>
310    </tr>
311    <tr>
312      <td>ioctl <a href="spec/r11430.htm">VIDIOC_S_MODULATOR</a></td>
313      <td>no</td>
314      <td>Opt.</td>
315    </tr>
316    <tr>
317      <td>ioctl <a href="spec/r11612.htm">VIDIOC_G_OUTPUT</a></td>
318      <td>yes, only when STREAM_OFF</td>
319      <td>Opt.</td>
320    </tr>
321    <tr>
322      <td>ioctl <a href="spec/r11612.htm">VIDIOC_S_OUTPUT</a></td>
323      <td>yes, only when STREAM_OFF</td>
324      <td>Opt.</td>
325    </tr>
326    <tr>
327      <td>ioctl <a href="spec/r11680.htm">VIDIOC_G_PARM</a></td>
328      <td>yes, only when STREAM_OFF</td>
329      <td>Opt.</td>
330    </tr>
331    <tr>
332      <td>ioctl <a href="spec/r11680.htm">VIDIOC_S_PARM</a></td>
333      <td>no</td>
334      <td>Opt.</td>
335    </tr>
336    <tr>
337      <td>ioctl <a href="spec/r11946.htm">VIDIOC_G_PRIORITY</a></td>
338      <td>yes, only when STREAM_OFF</td>
339      <td>Opt.</td>
340    </tr>
341    <tr>
342      <td>ioctl <a href="spec/r11946.htm">VIDIOC_S_PRIORITY</a></td>
343      <td>yes, only when STREAM_OFF</td>
344      <td>Opt.</td>
345    </tr>
346    <tr>
347      <td>ioctl <a href="spec/r12051.htm">VIDIOC_G_SLICED_VBI_CAP</a></td>
348      <td>yes, only when STREAM_OFF</td>
349      <td>Opt.</td>
350    </tr>
351    <tr>
352      <td>ioctl <a href="spec/r12265.htm">VIDIOC_G_STD</a></td>
353      <td>yes, only when STREAM_OFF</td>
354      <td>Opt.</td>
355    </tr>
356    <tr>
357      <td>ioctl <a href="spec/r12265.htm">VIDIOC_S_STD</a></td>
358      <td>yes, only when STREAM_OFF</td>
359      <td>Opt.</td>
360    </tr>
361    <tr>
362      <td>ioctl <a href="spec/r12342.htm">VIDIOC_G_TUNER</a></td>
363      <td>yes, only when STREAM_OFF</td>
364      <td><br></td>
365    </tr>
366    <tr>
367      <td>ioctl <a href="spec/r12342.htm">VIDIOC_S_TUNER</a></td>
368      <td>yes, only when STREAM_OFF</td>
369      <td><br></td>
370    </tr>
371    <tr>
372      <td>ioctl <a href="spec/r12784.htm">VIDIOC_LOG_STATUS</a></td>
373      <td>yes, only when STREAM_OFF</td>
374      <td>Opt.</td>
375    </tr>
376    <tr>
377      <td>ioctl <a href="spec/r12816.htm">VIDIOC_OVERLAY</a></td>
378      <td>no</td>
379      <td>Opt.</td>
380    </tr>
381    <tr>
382      <td>ioctl <a href="spec/r12878.htm">VIDIOC_QBUF</a></td>
383      <td>no</td>
384      <td>Opt.</td>
385    </tr>
386    <tr>
387      <td>ioctl <a href="spec/r12878.htm">VIDIOC_DQBUF</a></td>
388      <td>no</td>
389      <td>Opt.</td>
390    </tr>
391    <tr>
392      <td>ioctl <a href="spec/r13022.htm">VIDIOC_QUERYBUF</a></td>
393      <td>yes, only when STREAM_OFF</td>
394      <td>Opt.</td>
395    </tr>
396    <tr>
397      <td>ioctl <a href="spec/r13105.htm">VIDIOC_QUERYCAP</a></td>
398      <td>yes, only when STREAM_OFF</td>
399      <td>All</td>
400    </tr>
401    <tr>
402      <td>ioctl <a href="spec/r13317.htm">VIDIOC_QUERYCTRL</a></td>
403      <td>yes, only private and user controls;
404          only user controls with V4L2_CTRL_FLAG_NEXT_CTRL</td>
405      <td>Enum.</td>
406    </tr>
407    <tr>
408      <td>ioctl <a href="spec/r13317.htm">VIDIOC_QUERYMENU</a></td>
409      <td>yes, only when STREAM_OFF</td>
410      <td>Enum.</td>
411    </tr>
412    <tr>
413      <td>ioctl <a href="spec/r13641.htm">VIDIOC_QUERYSTD</a></td>
414      <td>yes, only when STREAM_OFF</td>
415      <td>Opt.</td>
416    </tr>
417    <tr>
418      <td>ioctl <a href="spec/r13696.htm">VIDIOC_REQBUFS</a></td>
419      <td>yes, only when STREAM_OFF</td>
420      <td>Opt.</td>
421    </tr>
422    <tr>
423      <td>ioctl <a href="spec/r13817.htm">VIDIOC_STREAMON</a></td>
424      <td>no</td>
425      <td>Opt.</td>
426    </tr>
427    <tr>
428      <td>ioctl <a href="spec/r13817.htm">VIDIOC_STREAMOFF</a></td>
429      <td>no</td>
430      <td>Opt.</td>
431    </tr>
432    <tr>
433      <td>V4L2 <a href="spec/r13889.htm">mmap()</a></td>
434      <td>no</td>
435      <td>Opt.</td>
436    </tr>
437    <tr>
438      <td>V4L2 <a href="spec/r14037.htm">munmap()</a></td>
439      <td>no</td>
440      <td>Opt.</td>
441    </tr>
442    <tr>
443      <td>V4L2 <a href="spec/r14090.htm">open()</a></td>
444      <td>yes, partly</td>
445      <td>All</td>
446    </tr>
447    <tr>
448      <td>V4L2 <a href="spec/r14169.htm">poll()</a></td>
449      <td>no</td>
450      <td>Opt.</td>
451    </tr>
452    <tr>
453      <td>V4L2 <a href="spec/r14264.htm">read()</a></td>
454      <td>no</td>
455      <td>Opt.</td>
456    </tr>
457    <tr>
458      <td>V4L2 <a href="spec/r14390.htm">select()</a></td>
459      <td>no</td>
460      <td>Opt.</td>
461    </tr>
462    <tr>
463      <td>V4L2 <a href="spec/r14496.htm">write()</a></td>
464      <td>no</td>
465      <td>Opt.</td>
466    </tr>
467  </tbody>
468</table>
469
470<p>
471All: all drivers should support<br>
472Opt.: optional<br>
473Enum.: enumeration, will return EINVAL for the first unknown entry<br>
474Exp.: experimental, may change in future
475</p>
476
477<p>The following actions are not part of the V4L2 API but they might have
478influence on the V4L2 API functions:</p>
479
480<table border="1" cellpadding="2"
481 cellspacing="0">
482  <thead>
483    <tr>
484      <td><b>Action</b></td>
485      <td><b>Covered?</b></td>
486    </tr>
487  </thead>
488  <tbody>
489    <tr>
490      <td>Load kernel module</td>
491      <td>no</td>
492    </tr>
493    <tr>
494      <td>Unload kernel module</td>
495      <td>no</td>
496    </tr>
497    <tr>
498      <td>USB connect event (in case of USB webcams)</td>
499      <td>no</td>
500    </tr>
501    <tr>
502      <td>USB disconnect event (in case of USB webcams)</td>
503      <td>no</td>
504    </tr>
505    <tr>
506      <td>Suspend</td>
507      <td>no</td>
508    </tr>
509    <tr>
510      <td>Resume</td>
511      <td>no</td>
512    </tr>
513    <tr>
514      <td>Check for memory leak (e.g. analyze /proc/slab_allocators)</td>
515      <td>no</td>
516    </tr>
517    <tr>
518      <td>Opening /dev/video0 multiple times</td>
519      <td>no</td>
520    </tr>
521    <tr>
522      <td>Using /dev/video0 from a multi-threaded or multi-process environment paralell</td>
523      <td>no</td>
524    </tr>
525  </tbody>
526</table>
527
528
529<h2><a name="others">Similar projects</a></h2>
530<p>
531There migth be similar projects which also tries to test the V4L2 API.
532So far I could find the following:
533</p>
534<ul>
535  <li>A <a href="http://www.linuxtv.org/wiki/index.php/V4L_Test_Suite">
536  list of V4L and V4L2 test drivers and applications</a> at
537  <a href="http://www.linuxtv.org/wiki/index.php/Main_Page">LinuxTV Wiki</a>
538  </li>
539  <li><a href="http://www.linuxowl.com/v4ltest.html">v4ltest</a><br>
540  </li>
541  <li>test cases in <a href="http://linuxtv.org/hg/dvb-apps/file">dvb-apps repository</a>, under /test directory
542  </li>
543  <li>test cases in <a href="http://linuxtv.org/hg/v4l-dvb/file">v4l-dvb repository</a>, under /v4l2-apps/test directory
544  </li>
545  <li>this test environment is also available under <a href="http://ltp.sourceforge.net/">Linux Test Project</a>
546      (LTP), under directory testcases/kernel/device-drivers/v4l/user_space
547  </li>
548</ul>
549<p>
550Please let me know if this list misses other V4L or V4L2 test project.
551</p>
552<p>
553The following documents and articles are useful if you are dealing with V4L2:
554</p>
555<ul>
556  <li>
557  <a href="http://v4l2spec.bytesex.org/spec/">Video for Linux Two API Specification</a>
558  </li>
559  <li>
560  <a href="http://lwn.net/Articles/203924/">The Video4Linux2 API series</a> at
561  <a href="http://lwn.net/">lwn.net</a>
562  </li>
563  <li><a href="http://freshmeat.net/projects/libv4l">libv4l</a>
564      <a href="http://people.atrpms.net/~hdegoede/libv4l-0.5.8.tar.gz">0.5.8</a>
565  </li>
566  <li>Simple V4L2 video viewer: <a href="http://moinejf.free.fr/svv.c">svv.c</a>,
567      writen by <a href="http://moinejf.free.fr/">Jean-François Moine</a>
568  </li>
569</ul>
570<p>
571For USB or V4L loopback testing:
572</p>
573<ul>
574  <li>
575  <a href="http://sourceforge.net/projects/usbip/">USB/IP</a>
576  </li>
577  <li>
578  <a href="http://www.linux-usb.org/gadget/">Linux-USB Gadget API Framework</a>
579  </li>
580  <li>
581  <a href="http://www.lavrsen.dk/twiki/bin/view/Motion/VideoFourLinuxLoopbackDevice">
582  Video4Linux Loopback Device
583  </a>
584  </li>
585</ul>
586<p>
587And what else can we read if we are looking for webcam test ideas:
588</p>
589<ul>
590  <li>
591  <a href="http://www.microsoft.com/whdc/device/media/vidcap-drvtest.mspx">
592  Testing Windows Video Capture Drivers
593  </a>
594  </li>
595  <li>
596  <a href="http://www.microsoft.com/whdc/device/media/WebCam_VidTests.mspx">
597  Webcam Video Fidelity Tests
598  </a>
599</ul>
600
601<h2><a name="feedback">Feedbacks</a></h2>
602<p>Any feedbacks, comments, ideas, etc. are welcome at the author's email address.
603You can find the email address in the source package in the README file.</p>
604<hr style="width: 100%; height: 2px;">
605<p>Last changed:
606Thu Jul 23 06:47:49 CEST 2009
607</p>
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613</p>
614
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617