Streams.cpp 13.7 KB
Newer Older
1 2 3
/*
 * Streams.cpp
 *****************************************************************************
4
 * Copyright (C) 2014 - VideoLAN and VLC authors
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/
20 21 22 23 24

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

25
#include "Streams.hpp"
26
#include "http/HTTPConnection.hpp"
27
#include "http/HTTPConnectionManager.h"
28
#include "playlist/BaseRepresentation.h"
29
#include "playlist/SegmentChunk.hpp"
30 31 32
#include "plumbing/SourceStream.hpp"
#include "plumbing/CommandsQueue.hpp"
#include "tools/Debug.hpp"
33
#include <vlc_demux.h>
34

35 36
using namespace adaptive;
using namespace adaptive::http;
37

38
AbstractStream::AbstractStream(demux_t * demux_)
39
{
40
    p_realdemux = demux_;
41
    format = StreamFormat::UNSUPPORTED;
42 43
    currentChunk = NULL;
    eof = false;
44
    dead = false;
45
    disabled = false;
46
    discontinuity = false;
47
    segmentTracker = NULL;
48
    demuxersource = NULL;
49
    commandsqueue = NULL;
50 51
    demuxer = NULL;
    fakeesout = NULL;
52
    vlc_mutex_init(&lock);
53
}
54

55 56 57 58 59
bool AbstractStream::init(const StreamFormat &format_, SegmentTracker *tracker, HTTPConnectionManager *conn)
{
    /* Don't even try if not supported or already init */
    if((unsigned)format_ == StreamFormat::UNSUPPORTED || demuxersource)
        return false;
60 61

    demuxersource = new (std::nothrow) ChunksSourceStream( VLC_OBJECT(p_realdemux), this );
62
    if(demuxersource)
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
        CommandsFactory *factory = new (std::nothrow) CommandsFactory();
        if(factory)
        {
            commandsqueue = new (std::nothrow) CommandsQueue(factory);
            if(commandsqueue)
            {
                fakeesout = new (std::nothrow) FakeESOut(p_realdemux->out, commandsqueue);
                if(fakeesout)
                {
                    /* All successfull */
                    fakeesout->setExtraInfoProvider( this );
                    format = format_;
                    segmentTracker = tracker;
                    segmentTracker->registerListener(this);
                    connManager = conn;
                    return true;
                }
                delete commandsqueue;
                commandsqueue = NULL;
            }
            else
            {
                delete factory;
            }
        }
89 90 91
        delete demuxersource;
    }

92
    return false;
93 94
}

95
AbstractStream::~AbstractStream()
96 97
{
    delete currentChunk;
98
    delete segmentTracker;
99 100 101 102

    delete demuxer;
    delete demuxersource;
    delete fakeesout;
103
    delete commandsqueue;
104 105

    vlc_mutex_destroy(&lock);
106 107
}

108
void AbstractStream::prepareRestart(bool b_discontinuity)
109
{
110 111 112 113 114 115
    if(demuxer)
    {
        /* Enqueue Del Commands for all current ES */
        demuxer->drain();
        /* Enqueue Del Commands for all current ES */
        fakeesout->scheduleAllForDeletion();
116 117
        if(b_discontinuity)
            fakeesout->schedulePCRReset();
118
        commandsqueue->Commit();
119
        /* ignoring demuxer's own Del commands */
120
        commandsqueue->setDrop(true);
121
        delete demuxer;
122
        commandsqueue->setDrop(false);
123 124
        demuxer = NULL;
    }
125 126
}

127
void AbstractStream::setLanguage(const std::string &lang)
128 129
{
    language = lang;
130 131
}

132
void AbstractStream::setDescription(const std::string &desc)
133 134 135 136
{
    description = desc;
}

137
bool AbstractStream::isDead() const
138 139 140 141 142
{
    return dead;
}

mtime_t AbstractStream::getPCR() const
143
{
144 145 146 147
    vlc_mutex_lock(const_cast<vlc_mutex_t *>(&lock));
    mtime_t pcr = (dead || disabled) ? VLC_TS_INVALID : commandsqueue->getPCR();
    vlc_mutex_unlock(const_cast<vlc_mutex_t *>(&lock));
    return pcr;
148 149
}

150 151 152 153 154 155 156
mtime_t AbstractStream::getMinAheadTime() const
{
    if(!segmentTracker)
        return 0;
    return segmentTracker->getMinAheadTime();
}

157
mtime_t AbstractStream::getFirstDTS() const
158
{
159 160 161 162 163 164 165 166 167 168 169 170 171 172
    mtime_t dts;
    vlc_mutex_lock(const_cast<vlc_mutex_t *>(&lock));
    if(dead || disabled)
    {
        dts = VLC_TS_INVALID;
    }
    else
    {
        dts = commandsqueue->getFirstDTS();
        if(dts == VLC_TS_INVALID)
            dts = commandsqueue->getPCR();
    }
    vlc_mutex_unlock(const_cast<vlc_mutex_t *>(&lock));
    return dts;
173 174
}

175
int AbstractStream::esCount() const
176
{
177
    return fakeesout->esCount();
178 179
}

180
bool AbstractStream::seekAble() const
181
{
182 183 184
    return (demuxer &&
            !fakeesout->restarting() &&
            !discontinuity &&
185
            !commandsqueue->isFlushing() );
186 187
}

188
bool AbstractStream::isSelected() const
189
{
190
    return fakeesout->hasSelectedEs();
191 192
}

193
bool AbstractStream::reactivate(mtime_t basetime)
194 195 196 197 198 199 200 201 202 203 204 205 206
{
    if(setPosition(basetime, false))
    {
        disabled = false;
        return true;
    }
    else
    {
        eof = true; /* can't reactivate */
        return false;
    }
}

207 208 209 210 211
bool AbstractStream::startDemux()
{
    if(demuxer)
        return false;

212 213
    demuxersource->Reset();
    demuxer = createDemux(format);
214
    if(!demuxer && format != StreamFormat())
215 216 217 218 219 220 221 222 223 224 225
        msg_Err(p_realdemux, "Failed to create demuxer");

    return !!demuxer;
}

bool AbstractStream::restartDemux()
{
    if(!demuxer)
    {
        return startDemux();
    }
226
    else if(demuxer->needsRestartOnSeek())
227 228 229 230
    {
        /* Push all ES as recycling candidates */
        fakeesout->recycleAll();
        /* Restart with ignoring pushes to queue */
231
        return demuxer->restart(commandsqueue);
232
    }
233
    commandsqueue->Commit();
234 235 236 237
    return true;
}

bool AbstractStream::isDisabled() const
238 239 240 241
{
    return disabled;
}

242 243 244 245 246
bool AbstractStream::drain()
{
    return fakeesout->drain();
}

247 248
AbstractStream::buffering_status AbstractStream::bufferize(mtime_t nz_deadline,
                                                           unsigned i_min_buffering, unsigned i_extra_buffering)
249
{
250 251
    vlc_mutex_lock(&lock);

252
    /* Ensure it is configured */
253
    if(!segmentTracker || !connManager || dead)
254
    {
255 256 257
        vlc_mutex_unlock(&lock);
        return AbstractStream::buffering_end;
    }
258

259 260 261 262 263 264 265 266 267 268
    /* Disable streams that are not selected (alternate streams) */
    if(esCount() && !isSelected() && !fakeesout->restarting())
    {
        disabled = true;
        segmentTracker->reset();
        commandsqueue->Abort(false);
        msg_Dbg(p_realdemux, "deactivating stream %s", format.str().c_str());
        vlc_mutex_unlock(&lock);
        return AbstractStream::buffering_end;
    }
269

270 271 272 273
    if(commandsqueue->isFlushing())
    {
        vlc_mutex_unlock(&lock);
        return AbstractStream::buffering_suspended;
274 275
    }

276
    if(!demuxer)
277
    {
278
        format = segmentTracker->getCurrentFormat();
279
        if(!startDemux())
280
        {
281 282 283 284
            /* If demux fails because of probing failure / wrong format*/
            if(discontinuity)
            {
                msg_Dbg( p_realdemux, "Flushing on format change" );
285
                prepareRestart();
286
                discontinuity = false;
287
                commandsqueue->setFlush();
288 289
                vlc_mutex_unlock(&lock);
                return AbstractStream::buffering_ongoing;
290 291
            }
            dead = true; /* Prevent further retries */
292 293 294
            commandsqueue->setEOF();
            vlc_mutex_unlock(&lock);
            return AbstractStream::buffering_end;
295
        }
296
        setTimeOffset();
297 298
    }

299 300 301 302
    const int64_t i_total_buffering = i_min_buffering + i_extra_buffering;

    mtime_t i_demuxed = commandsqueue->getDemuxedAmount();
    if(i_demuxed < i_total_buffering) /* not already demuxed */
303
    {
304
        if(!segmentTracker->segmentsListReady()) /* Live Streams */
305 306 307 308 309 310 311
        {
            vlc_mutex_unlock(&lock);
            return AbstractStream::buffering_suspended;
        }

        nz_deadline = commandsqueue->getBufferingLevel() +
                     (i_total_buffering - commandsqueue->getDemuxedAmount()) / (CLOCK_FREQ/4);
312

313
        /* need to read, demuxer still buffering, ... */
314 315 316 317
        vlc_mutex_unlock(&lock);
        int i_ret = demuxer->demux(nz_deadline);
        vlc_mutex_lock(&lock);
        if(i_ret != VLC_DEMUXER_SUCCESS)
318
        {
319
            if(discontinuity)
320 321
            {
                msg_Dbg( p_realdemux, "Flushing on discontinuity" );
322
                prepareRestart();
323
                discontinuity = false;
324
                commandsqueue->setFlush();
325 326
                vlc_mutex_unlock(&lock);
                return AbstractStream::buffering_ongoing;
327
            }
328 329 330
            commandsqueue->setEOF();
            vlc_mutex_unlock(&lock);
            return AbstractStream::buffering_end;
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
        i_demuxed = commandsqueue->getDemuxedAmount();
    }
    vlc_mutex_unlock(&lock);

    if(i_demuxed < i_total_buffering) /* need to read more */
    {
        if(i_demuxed < i_min_buffering)
            return AbstractStream::buffering_lessthanmin; /* high prio */
        return AbstractStream::buffering_ongoing;
    }
    return AbstractStream::buffering_full;
}

AbstractStream::status AbstractStream::dequeue(mtime_t nz_deadline, mtime_t *pi_pcr)
{
    vlc_mutex_locker locker(&lock);

    *pi_pcr = nz_deadline;

    if (disabled || dead)
        return AbstractStream::status_eof;

    if(commandsqueue->isFlushing())
    {
        *pi_pcr = commandsqueue->Process(p_realdemux->out, VLC_TS_0 + nz_deadline);
        if(!commandsqueue->isEmpty())
            return AbstractStream::status_demuxed;

        if(!commandsqueue->isEOF())
361
        {
362 363
            commandsqueue->Abort(true); /* reset buffering level and flags */
            return AbstractStream::status_discontinuity;
364
        }
365 366
    }

367 368 369 370 371
    if(commandsqueue->isEOF())
    {
        *pi_pcr = nz_deadline;
        return AbstractStream::status_eof;
    }
372

373 374 375
    AdvDebug(msg_Dbg(p_realdemux, "Stream %s pcr %ld dts %ld deadline %ld buflevel %ld",
                     description.c_str(), commandsqueue->getPCR(), commandsqueue->getFirstDTS(),
                     nz_deadline, commandsqueue->getBufferingLevel()));
376

377
    if(nz_deadline + VLC_TS_0 <= commandsqueue->getBufferingLevel()) /* demuxed */
378
    {
379 380
        *pi_pcr = commandsqueue->Process( p_realdemux->out, VLC_TS_0 + nz_deadline );
        return AbstractStream::status_demuxed;
381 382
    }

383
    return AbstractStream::status_buffering;
384 385
}

386
block_t * AbstractStream::readNextBlock()
387
{
388 389
    if (currentChunk == NULL && !eof)
        currentChunk = segmentTracker->getNextChunk(!fakeesout->restarting(), connManager);
390

391
    if(discontinuity)
392
    {
393 394
        msg_Info(p_realdemux, "Encountered discontinuity");
        /* Force stream/demuxer to end for this call */
395 396 397
        return NULL;
    }

398
    if(currentChunk == NULL)
399
    {
400
        eof = true;
401 402
        return NULL;
    }
403

404
    const bool b_segment_head_chunk = (currentChunk->getBytesRead() == 0);
405

406
    block_t *block = currentChunk->readBlock();
407
    if(block == NULL)
408
    {
409
        delete currentChunk;
410
        currentChunk = NULL;
411
        return NULL;
412 413
    }

414
    if (currentChunk->isEmpty())
415
    {
416
        delete currentChunk;
417
        currentChunk = NULL;
418 419
    }

420
    block = checkBlock(block, b_segment_head_chunk);
421

422
    return block;
423 424
}

425
bool AbstractStream::setPosition(mtime_t time, bool tryonly)
426
{
427
    if(!seekAble())
428 429
        return false;

430
    bool ret = segmentTracker->setPositionByTime(time, demuxer->needsRestartOnSeek(), tryonly);
431
    if(!tryonly && ret)
432
    {
433
        if(demuxer->needsRestartOnSeek())
434 435 436 437
        {
            if(currentChunk)
                delete currentChunk;
            currentChunk = NULL;
438

439 440
            if( !restartDemux() )
                dead = true;
441

442
            setTimeOffset();
443
        }
444
        else commandsqueue->Abort( true );
445 446 447

        es_out_Control(p_realdemux->out, ES_OUT_SET_NEXT_DISPLAY_TIME,
                       VLC_TS_0 + time);
448
    }
449 450 451
    return ret;
}

452
mtime_t AbstractStream::getPlaybackTime() const
453
{
454
    return segmentTracker->getPlaybackTime();
455
}
456

457
void AbstractStream::runUpdates()
458 459 460 461
{
    if(!isDisabled())
        segmentTracker->updateSelected();
}
462 463 464 465 466 467 468 469 470

void AbstractStream::fillExtraFMTInfo( es_format_t *p_fmt ) const
{
    if(!p_fmt->psz_language && !language.empty())
        p_fmt->psz_language = strdup(language.c_str());
    if(!p_fmt->psz_description && !description.empty())
        p_fmt->psz_description = strdup(description.c_str());
}

471 472 473 474 475 476 477 478 479 480
void AbstractStream::setTimeOffset()
{
    /* Check if we need to set an offset as the demuxer
     * will start from zero from seek point */
    if(demuxer && demuxer->alwaysStartsFromZero())
        fakeesout->setTimestampOffset(segmentTracker->getPlaybackTime());
    else
        fakeesout->setTimestampOffset(0);
}

481 482 483 484 485 486 487 488 489 490 491 492 493
void AbstractStream::trackerEvent(const SegmentTrackerEvent &event)
{
    switch(event.type)
    {
        case SegmentTrackerEvent::DISCONTINUITY:
            discontinuity = true;
            break;

        case SegmentTrackerEvent::FORMATCHANGE:
            /* Check if our current demux is still valid */
            if(*event.u.format.f != format)
            {
                /* Format has changed between segments, we need to drain and change demux */
494 495
                msg_Info(p_realdemux, "Changing stream format %s -> %s",
                         format.str().c_str(), event.u.format.f->str().c_str());
496 497 498 499 500 501 502 503 504 505 506 507
                format = *event.u.format.f;

                /* This is an implict discontinuity */
                discontinuity = true;
            }
            break;

        case SegmentTrackerEvent::SWITCHING:
        default:
            break;
    }
}