File: pts.h

package info (click to toggle)
vdr-plugin-bitstreamout 0.85-9
  • links: PTS
  • area: main
  • in suites: etch, etch-m68k
  • size: 764 kB
  • ctags: 993
  • sloc: ansic: 9,319; makefile: 158; sh: 139
file content (335 lines) | stat: -rw-r--r-- 7,611 bytes parent folder | download | duplicates (2)
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
/*
 * pts.h:	P(resentation) T(ime) S(tamps) handling
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
 *
 * Copyright (C) 2003 Werner Fink, <werner@suse.de>
 */
#ifndef __PTS_H
#define __PTS_H

#ifndef _POSIX_SOURCE
# define _POSIX_SOURCE
#endif
#include <sys/time.h>
#include <unistd.h>
#include <vdr/config.h>
#include <vdr/device.h>
#include "types.h"

//#define DEBUG_PTS
#if defined(DEBUG) && !defined(DEBUG_PTS)
# define DEBUG_PTS
#endif
#ifdef  DEBUG_PTS
# define debug_pts(args...) fprintf(stderr, args)
#else
# define debug_pts(args...)
#endif
#define STC_STATERR	(~0U/90U)

enum ePTSstate { eOK = 0, eMISSED = -1, eDOSKIP = 1 };

class cPTS {
private:
    uint_32 pts;
    uint_32 stc;
    off_t   off;
    off_t   min;
    struct timeval expire, syncstc, current, previous;
    uint_8  err;
    bool AVsync, Started, Synching, HasPTS;

    inline uint_32 PTSinMS(const uint_8 *pts)
    {
	return (uint_32)
	((   ((uint_64)(pts[0] & 0x0E) << 29)
	   | ((uint_64)(pts[1])        << 22)
	   | ((uint_64)(pts[2] & 0xFE) << 14)
	   | ((uint_64)(pts[3])        <<  7)
	   | ((uint_64)(pts[4] & 0xFE) >>  1))/90ULL);
    }

    inline void timermark(void)
    {
        if (!timerisset(&previous))
	    gettimeofday(&previous, NULL);
	if (!timerisset(&expire)) {
	    static const struct timeval add = {2, 0};
	    timeradd(&previous, &add, &expire);
	}
	if (!timerisset(&syncstc)) {
	    static const struct timeval add = {0, 480*1000};
	    timeradd(&previous, &add, &syncstc);
	}
    }

    inline bool timerexpired(void)
    {
	if (timerisset(&current)) {
	    previous.tv_sec  = current.tv_sec;
	    previous.tv_usec = current.tv_usec;
	}
	gettimeofday(&current, NULL);
	if (!timerisset(&expire)) {
	    debug_pts("timerexpired() set expire\n");
	    static const struct timeval add = {2, 0};
	    timeradd(&current, &add, &expire);
	    return false;
	}
	return timercmp(&current, &expire, >);
    }

    inline bool timersyncstc(void)
    {
	if (timerisset(&current)) {
	    previous.tv_sec  = current.tv_sec;
	    previous.tv_usec = current.tv_usec;
	}
	gettimeofday(&current, NULL);
	if (!timerisset(&syncstc)) {
	    debug_pts("timersyncstc() set syncstc\n");
	    static const struct timeval add = {0, 480*1000};
	    timeradd(&current, &add, &syncstc);
	    return false;
	}
	return timercmp(&current, &syncstc, >);
    }

    inline bool  dvbtime (void)
    {
#if defined(VDRVERSNUM) && VDRVERSNUM >= 10206
	cDevice* PrimaryDevice = cDevice::PrimaryDevice();
	sint_64 ret;

	debug_pts("dvbtime in\n");

	if (!PrimaryDevice) {	// No Device, always wrong
	    err++;		// due missed reference
	    goto out;
	}

	if ((ret = PrimaryDevice->GetSTC()) < 0) {
	    err++;		// Device error
	    goto out;
	}
	stc = (uint_32)(((uint_64)ret)/90ULL);

	//
	// The av711x DVB card/driver seems to have trouble
	// with large values (missing 33th bit aka > ~0U)
	//
	if (pts > STC_STATERR && stc < STC_STATERR+10000)
	    stc += STC_STATERR;

	//
	// We have following cases
	//   off >  0 Earlier (we may play silent with duration `off')
	//   off <  0 Late    (we're in trouble, no time back)
	//   off == 0 Fit     (Strike)
	//
	off = pts - stc;
	debug_pts("dvbtime PTS=%u STC=%u off=%ld\n", pts, stc, off);

	return true;
    out:
	off = -1000;
	debug_pts("dvbtime out bad\n");
#endif
	return false;
    };

    //
    // timersyncstc() or timerexpired() must be called first
    //
    inline bool dvbAVsync (void)
    {
#if defined(VDRVERSNUM) && VDRVERSNUM >= 10206
	struct timeval sub;
	off_t diff, delay;

	debug_pts("dvbAVsync in\n");

	if (AVsync) {
	    if (!dvbtime())
		goto err;
	    debug_pts("AVsync STC=%d\n", stc);
	    goto out;
	}

	timersub(&current, &previous, &sub);
	delay = (sub.tv_sec*1000 + sub.tv_usec/1000);

	diff = stc;		// Previous STC value

	if (!dvbtime())		// Fetch new STC value from DVB
	    goto err;

	if ((diff = stc - diff) < 0)
	    goto err;		// DVB AV are definitly not in sync

	//
	// The DVB STC delay should be in sync with
	// The system clock delay (at least 1ms).
	//
	debug_pts("dvbAVsync dSTC=%ld, dCLOCK=%ld\n", diff, delay);
	if ((diff < delay - 2) || (diff > delay + 2))
	    goto err;

	//
	// Assume that DVB STC clock is now in sync with
	// the System clock.
	//
	AVsync = true;
    out:
	debug_pts("dvbAVsync out true\n");
	return true;
    err:
	debug_pts("dvbAVsync out bad\n");
#endif
	return false;
    };

    inline off_t less(void)
    {
	off_t ret = min;
	if (min >= 100)
	    min -= 20;
	else
	    min -= 10;
	return ret;
    };

public:
    inline bool  mark(const uint_8 *buf = (const uint_8 *)0)
    {
	if (buf) {
	    pts = PTSinMS(buf);
	    HasPTS = true;
	} else if (!HasPTS && timersyncstc())
	    return true;		// Do not hanging around
	return HasPTS;
    };
    inline void  lead(const uint_32 t)
    {
	timerclear(&expire);
	err = 0;
	min = 200;
	Synching = false;
    };
    inline void  reset(void)
    {
	pts = stc = 0;
	timerclear(&current);
	timerclear(&expire);
	timerclear(&syncstc);
	timerclear(&previous);
	err = 0;
	off = -1000;
	min = 200;
	AVsync = false;
	Started = false;
	Synching = false;
	HasPTS = false;
    };
    inline const bool synch(bool s = false)
    {
	if (s) Synching = true;
	return Synching;
    };

    inline bool  stcsync(bool h = false)
    {
	if (h) HasPTS = true;		// Do not hanging around later

#if defined(VDRVERSNUM) && VDRVERSNUM >= 10206
	if (AVsync) {
	    debug_pts("stcsync AV sync true\n");
	    goto out;
	}

	if (!Started) {			// Timer should be started
	    timermark();
	    Started = true;		// Timer started
	}

	if (timersyncstc()) {
	    debug_pts("stcsync timersyncstc()\n");
	    goto out;			// Timer expired
	}

	if (!dvbAVsync()) {
	    debug_pts("stcsync !dvbAVsync()\n");
	    goto bad;
	}
    bad:
	return false;
    out:
#endif
	return true;
    };

    inline bool  dvbcheck(const uint_32 delay)
    {
#if defined(VDRVERSNUM) && VDRVERSNUM >= 10206
	debug_pts("dvbcheck in\n");

	if (err > 10)
	    goto out;			// Ignore continuing error

	if (pts == 0) {
	    debug_pts("dvbcheck pts == 0, HasPTS = %d\n", HasPTS);
	    off = 0;
	    goto out;			// What should we compare?
	}

	if (timerexpired()) {
	    debug_pts("dvbcheck timerexpired()\n");
	    goto out;			// Timer expired
	}

	if (!dvbAVsync()) {
	    debug_pts("dvbcheck !dvbAVsync()\n");
	    goto bad;
	}

	if (off >= less()) {		// 10ms which is 33cm
	    timerclear(&expire);
	    goto out;			// Success
	}
    bad:
	pts += delay;			// Next frame starts with this PTS
	debug_pts("dvbcheck out bad\n");
	return false;
    out:
	debug_pts("dvbcheck out true\n");
#endif
	return true;
    };

    inline off_t delay(off_t ignore)
    {
#if defined(VDRVERSNUM) && VDRVERSNUM >= 10206
	debug_pts("delay (abs(off=%ld) > ignore=%ld) == %d\n", off, ignore, (abs(off) > ignore));
	if (abs(off) > ignore)
	    off = 0;
	return off;
#else
	return 0;
#endif
    };
};
#endif