summaryrefslogtreecommitdiffstats
path: root/Documentation/DocBook/media/dvb/examples.xml
blob: f037e568eb6e7d2ef50a30b8b0aa62fc05c86dfd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
<title>Examples</title>
<para>In this section we would like to present some examples for using the DVB API.
</para>
<para>Maintainer note: This section is out of date. Please refer to the sample programs packaged
with the driver distribution from <ulink url="http://linuxtv.org/hg/dvb-apps" />.
</para>

<section id="tuning">
<title>Tuning</title>
<para>We will start with a generic tuning subroutine that uses the frontend and SEC, as well as
the demux devices. The example is given for QPSK tuners, but can easily be adjusted for
QAM.
</para>
<programlisting>
 #include &#x003C;sys/ioctl.h&#x003E;
 #include &#x003C;stdio.h&#x003E;
 #include &#x003C;stdint.h&#x003E;
 #include &#x003C;sys/types.h&#x003E;
 #include &#x003C;sys/stat.h&#x003E;
 #include &#x003C;fcntl.h&#x003E;
 #include &#x003C;time.h&#x003E;
 #include &#x003C;unistd.h&#x003E;

 #include &#x003C;linux/dvb/dmx.h&#x003E;
 #include &#x003C;linux/dvb/frontend.h&#x003E;
 #include &#x003C;linux/dvb/sec.h&#x003E;
 #include &#x003C;sys/poll.h&#x003E;

 #define DMX "/dev/dvb/adapter0/demux1"
 #define FRONT "/dev/dvb/adapter0/frontend1"
 #define SEC "/dev/dvb/adapter0/sec1"

 /&#x22C6; routine for checking if we have a signal and other status information&#x22C6;/
 int FEReadStatus(int fd, fe_status_t &#x22C6;stat)
 {
	 int ans;

	 if ( (ans = ioctl(fd,FE_READ_STATUS,stat) &#x003C; 0)){
		 perror("FE READ STATUS: ");
		 return -1;
	 }

	 if (&#x22C6;stat &amp; FE_HAS_POWER)
		 printf("FE HAS POWER\n");

	 if (&#x22C6;stat &amp; FE_HAS_SIGNAL)
		 printf("FE HAS SIGNAL\n");

	 if (&#x22C6;stat &amp; FE_SPECTRUM_INV)
		 printf("SPEKTRUM INV\n");

	 return 0;
 }


 /&#x22C6; tune qpsk &#x22C6;/
 /&#x22C6; freq:             frequency of transponder                      &#x22C6;/
 /&#x22C6; vpid, apid, tpid: PIDs of video, audio and teletext TS packets  &#x22C6;/
 /&#x22C6; diseqc:           DiSEqC address of the used LNB                &#x22C6;/
 /&#x22C6; pol:              Polarisation                                  &#x22C6;/
 /&#x22C6; srate:            Symbol Rate                                   &#x22C6;/
 /&#x22C6; fec.              FEC                                           &#x22C6;/
 /&#x22C6; lnb_lof1:         local frequency of lower LNB band             &#x22C6;/
 /&#x22C6; lnb_lof2:         local frequency of upper LNB band             &#x22C6;/
 /&#x22C6; lnb_slof:         switch frequency of LNB                       &#x22C6;/

 int set_qpsk_channel(int freq, int vpid, int apid, int tpid,
		 int diseqc, int pol, int srate, int fec, int lnb_lof1,
		 int lnb_lof2, int lnb_slof)
 {
	 struct secCommand scmd;
	 struct secCmdSequence scmds;
	 struct dmx_pes_filter_params pesFilterParams;
	 FrontendParameters frp;
	 struct pollfd pfd[1];
	 FrontendEvent event;
	 int demux1, demux2, demux3, front;

	 frequency = (uint32_t) freq;
	 symbolrate = (uint32_t) srate;

	 if((front = open(FRONT,O_RDWR)) &#x003C; 0){
		 perror("FRONTEND DEVICE: ");
		 return -1;
	 }

	 if((sec = open(SEC,O_RDWR)) &#x003C; 0){
		 perror("SEC DEVICE: ");
		 return -1;
	 }

	 if (demux1 &#x003C; 0){
		 if ((demux1=open(DMX, O_RDWR|O_NONBLOCK))
		     &#x003C; 0){
			 perror("DEMUX DEVICE: ");
			 return -1;
		 }
	 }

	 if (demux2 &#x003C; 0){
		 if ((demux2=open(DMX, O_RDWR|O_NONBLOCK))
		     &#x003C; 0){
			 perror("DEMUX DEVICE: ");
			 return -1;
		 }
	 }

	 if (demux3 &#x003C; 0){
		 if ((demux3=open(DMX, O_RDWR|O_NONBLOCK))
		     &#x003C; 0){
			 perror("DEMUX DEVICE: ");
			 return -1;
		 }
	 }

	 if (freq &#x003C; lnb_slof) {
		 frp.Frequency = (freq - lnb_lof1);
		 scmds.continuousTone = SEC_TONE_OFF;
	 } else {
		 frp.Frequency = (freq - lnb_lof2);
		 scmds.continuousTone = SEC_TONE_ON;
	 }
	 frp.Inversion = INVERSION_AUTO;
	 if (pol) scmds.voltage = SEC_VOLTAGE_18;
	 else scmds.voltage = SEC_VOLTAGE_13;

	 scmd.type=0;
	 scmd.u.diseqc.addr=0x10;
	 scmd.u.diseqc.cmd=0x38;
	 scmd.u.diseqc.numParams=1;
	 scmd.u.diseqc.params[0] = 0xF0 | ((diseqc &#x22C6; 4) &amp; 0x0F) |
		 (scmds.continuousTone == SEC_TONE_ON ? 1 : 0) |
		 (scmds.voltage==SEC_VOLTAGE_18 ? 2 : 0);

	 scmds.miniCommand=SEC_MINI_NONE;
	 scmds.numCommands=1;
	 scmds.commands=&amp;scmd;
	 if (ioctl(sec, SEC_SEND_SEQUENCE, &amp;scmds) &#x003C; 0){
		 perror("SEC SEND: ");
		 return -1;
	 }

	 if (ioctl(sec, SEC_SEND_SEQUENCE, &amp;scmds) &#x003C; 0){
		 perror("SEC SEND: ");
		 return -1;
	 }

	 frp.u.qpsk.SymbolRate = srate;
	 frp.u.qpsk.FEC_inner = fec;

	 if (ioctl(front, FE_SET_FRONTEND, &amp;frp) &#x003C; 0){
		 perror("QPSK TUNE: ");
		 return -1;
	 }

	 pfd[0].fd = front;
	 pfd[0].events = POLLIN;

	 if (poll(pfd,1,3000)){
		 if (pfd[0].revents &amp; POLLIN){
			 printf("Getting QPSK event\n");
			 if ( ioctl(front, FE_GET_EVENT, &amp;event)

			      == -EOVERFLOW){
				 perror("qpsk get event");
				 return -1;
			 }
			 printf("Received ");
			 switch(event.type){
			 case FE_UNEXPECTED_EV:
				 printf("unexpected event\n");
				 return -1;
			 case FE_FAILURE_EV:
				 printf("failure event\n");
				 return -1;

			 case FE_COMPLETION_EV:
				 printf("completion event\n");
			 }
		 }
	 }


	 pesFilterParams.pid     = vpid;
	 pesFilterParams.input   = DMX_IN_FRONTEND;
	 pesFilterParams.output  = DMX_OUT_DECODER;
	 pesFilterParams.pes_type = DMX_PES_VIDEO;
	 pesFilterParams.flags   = DMX_IMMEDIATE_START;
	 if (ioctl(demux1, DMX_SET_PES_FILTER, &amp;pesFilterParams) &#x003C; 0){
		 perror("set_vpid");
		 return -1;
	 }

	 pesFilterParams.pid     = apid;
	 pesFilterParams.input   = DMX_IN_FRONTEND;
	 pesFilterParams.output  = DMX_OUT_DECODER;
	 pesFilterParams.pes_type = DMX_PES_AUDIO;
	 pesFilterParams.flags   = DMX_IMMEDIATE_START;
	 if (ioctl(demux2, DMX_SET_PES_FILTER, &amp;pesFilterParams) &#x003C; 0){
		 perror("set_apid");
		 return -1;
	 }

	 pesFilterParams.pid     = tpid;
	 pesFilterParams.input   = DMX_IN_FRONTEND;
	 pesFilterParams.output  = DMX_OUT_DECODER;
	 pesFilterParams.pes_type = DMX_PES_TELETEXT;
	 pesFilterParams.flags   = DMX_IMMEDIATE_START;
	 if (ioctl(demux3, DMX_SET_PES_FILTER, &amp;pesFilterParams) &#x003C; 0){
		 perror("set_tpid");
		 return -1;
	 }

	 return has_signal(fds);
 }

</programlisting>
<para>The program assumes that you are using a universal LNB and a standard DiSEqC
switch with up to 4 addresses. Of course, you could build in some more checking if
tuning was successful and maybe try to repeat the tuning process. Depending on the
external hardware, i.e. LNB and DiSEqC switch, and weather conditions this may be
necessary.
</para>
</section>

<section id="the_dvr_device">
<title>The DVR device</title>
<para>The following program code shows how to use the DVR device for recording.
</para>
<programlisting>
 #include &#x003C;sys/ioctl.h&#x003E;
 #include &#x003C;stdio.h&#x003E;
 #include &#x003C;stdint.h&#x003E;
 #include &#x003C;sys/types.h&#x003E;
 #include &#x003C;sys/stat.h&#x003E;
 #include &#x003C;fcntl.h&#x003E;
 #include &#x003C;time.h&#x003E;
 #include &#x003C;unistd.h&#x003E;

 #include &#x003C;linux/dvb/dmx.h&#x003E;
 #include &#x003C;linux/dvb/video.h&#x003E;
 #include &#x003C;sys/poll.h&#x003E;
 #define DVR "/dev/dvb/adapter0/dvr1"
 #define AUDIO "/dev/dvb/adapter0/audio1"
 #define VIDEO "/dev/dvb/adapter0/video1"

 #define BUFFY (188&#x22C6;20)
 #define MAX_LENGTH (1024&#x22C6;1024&#x22C6;5) /&#x22C6; record 5MB &#x22C6;/


 /&#x22C6; switch the demuxes to recording, assuming the transponder is tuned &#x22C6;/

 /&#x22C6; demux1, demux2: file descriptor of video and audio filters &#x22C6;/
 /&#x22C6; vpid, apid:     PIDs of video and audio channels           &#x22C6;/

 int switch_to_record(int demux1, int demux2, uint16_t vpid, uint16_t apid)
 {
	 struct dmx_pes_filter_params pesFilterParams;

	 if (demux1 &#x003C; 0){
		 if ((demux1=open(DMX, O_RDWR|O_NONBLOCK))
		     &#x003C; 0){
			 perror("DEMUX DEVICE: ");
			 return -1;
		 }
	 }

	 if (demux2 &#x003C; 0){
		 if ((demux2=open(DMX, O_RDWR|O_NONBLOCK))
		     &#x003C; 0){
			 perror("DEMUX DEVICE: ");
			 return -1;
		 }
	 }

	 pesFilterParams.pid = vpid;
	 pesFilterParams.input = DMX_IN_FRONTEND;
	 pesFilterParams.output = DMX_OUT_TS_TAP;
	 pesFilterParams.pes_type = DMX_PES_VIDEO;
	 pesFilterParams.flags = DMX_IMMEDIATE_START;
	 if (ioctl(demux1, DMX_SET_PES_FILTER, &amp;pesFilterParams) &#x003C; 0){
		 perror("DEMUX DEVICE");
		 return -1;
	 }
	 pesFilterParams.pid = apid;
	 pesFilterParams.input = DMX_IN_FRONTEND;
	 pesFilterParams.output = DMX_OUT_TS_TAP;
	 pesFilterParams.pes_type = DMX_PES_AUDIO;
	 pesFilterParams.flags = DMX_IMMEDIATE_START;
	 if (ioctl(demux2, DMX_SET_PES_FILTER, &amp;pesFilterParams) &#x003C; 0){
		 perror("DEMUX DEVICE");
		 return -1;
	 }
	 return 0;
 }

 /&#x22C6; start recording MAX_LENGTH , assuming the transponder is tuned &#x22C6;/

 /&#x22C6; demux1, demux2: file descriptor of video and audio filters &#x22C6;/
 /&#x22C6; vpid, apid:     PIDs of video and audio channels           &#x22C6;/
 int record_dvr(int demux1, int demux2, uint16_t vpid, uint16_t apid)
 {
	 int i;
	 int len;
	 int written;
	 uint8_t buf[BUFFY];
	 uint64_t length;
	 struct pollfd pfd[1];
	 int dvr, dvr_out;

	 /&#x22C6; open dvr device &#x22C6;/
	 if ((dvr = open(DVR, O_RDONLY|O_NONBLOCK)) &#x003C; 0){
			 perror("DVR DEVICE");
			 return -1;
	 }

	 /&#x22C6; switch video and audio demuxes to dvr &#x22C6;/
	 printf ("Switching dvr on\n");
	 i = switch_to_record(demux1, demux2, vpid, apid);
	 printf("finished: ");

	 printf("Recording %2.0f MB of test file in TS format\n",
		MAX_LENGTH/(1024.0&#x22C6;1024.0));
	 length = 0;

	 /&#x22C6; open output file &#x22C6;/
	 if ((dvr_out = open(DVR_FILE,O_WRONLY|O_CREAT
				  |O_TRUNC, S_IRUSR|S_IWUSR
				  |S_IRGRP|S_IWGRP|S_IROTH|
				  S_IWOTH)) &#x003C; 0){
		 perror("Can't open file for dvr test");
		 return -1;
	 }

	 pfd[0].fd = dvr;
	 pfd[0].events = POLLIN;

	 /&#x22C6; poll for dvr data and write to file &#x22C6;/
	 while (length &#x003C; MAX_LENGTH ) {
		 if (poll(pfd,1,1)){
			 if (pfd[0].revents &amp; POLLIN){
				 len = read(dvr, buf, BUFFY);
				 if (len &#x003C; 0){
					 perror("recording");
					 return -1;
				 }
				 if (len &#x003E; 0){
					 written = 0;
					 while (written &#x003C; len)
						 written +=
							 write (dvr_out,
								buf, len);
					 length += len;
					 printf("written %2.0f MB\r",
						length/1024./1024.);
				 }
			 }
		 }
	 }
	 return 0;
 }

</programlisting>

</section>
OpenPOWER on IntegriCloud