ATSParser.cpp revision ed8d14f6a934072cd012992c4ef16990a54baa9a 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "ATSParser"
19#include <utils/Log.h>
20
21#include "ATSParser.h"
22
23#include "AnotherPacketSource.h"
24#include "ESQueue.h"
25#include "include/avc_utils.h"
26
27#include <media/stagefright/foundation/ABitReader.h>
28#include <media/stagefright/foundation/ABuffer.h>
29#include <media/stagefright/foundation/ADebug.h>
30#include <media/stagefright/foundation/AMessage.h>
31#include <media/stagefright/foundation/hexdump.h>
32#include <media/stagefright/MediaDefs.h>
33#include <media/stagefright/MediaErrors.h>
34#include <media/stagefright/MetaData.h>
35#include <utils/KeyedVector.h>
36
37namespace android {
38
39// I want the expression "y" evaluated even if verbose logging is off.
40#define MY_LOGV(x, y) \
41    do { unsigned tmp = y; LOGV(x, tmp); } while (0)
42
43static const size_t kTSPacketSize = 188;
44
45struct ATSParser::Program : public RefBase {
46    Program(ATSParser *parser, unsigned programMapPID);
47
48    bool parsePID(
49            unsigned pid, unsigned payload_unit_start_indicator,
50            ABitReader *br);
51
52    void signalDiscontinuity(DiscontinuityType type);
53    void signalEOS(status_t finalResult);
54
55    sp<MediaSource> getSource(SourceType type);
56
57    int64_t convertPTSToTimestamp(uint64_t PTS);
58
59    bool PTSTimeDeltaEstablished() const {
60        return mFirstPTSValid;
61    }
62
63private:
64    ATSParser *mParser;
65    unsigned mProgramMapPID;
66    KeyedVector<unsigned, sp<Stream> > mStreams;
67    bool mFirstPTSValid;
68    uint64_t mFirstPTS;
69
70    void parseProgramMap(ABitReader *br);
71
72    DISALLOW_EVIL_CONSTRUCTORS(Program);
73};
74
75struct ATSParser::Stream : public RefBase {
76    Stream(Program *program, unsigned elementaryPID, unsigned streamType);
77
78    unsigned type() const { return mStreamType; }
79    unsigned pid() const { return mElementaryPID; }
80    void setPID(unsigned pid) { mElementaryPID = pid; }
81
82    void parse(
83            unsigned payload_unit_start_indicator,
84            ABitReader *br);
85
86    void signalDiscontinuity(DiscontinuityType type);
87    void signalEOS(status_t finalResult);
88
89    sp<MediaSource> getSource(SourceType type);
90
91protected:
92    virtual ~Stream();
93
94private:
95    Program *mProgram;
96    unsigned mElementaryPID;
97    unsigned mStreamType;
98
99    sp<ABuffer> mBuffer;
100    sp<AnotherPacketSource> mSource;
101    bool mPayloadStarted;
102    DiscontinuityType mPendingDiscontinuity;
103
104    ElementaryStreamQueue mQueue;
105
106    void flush();
107    void parsePES(ABitReader *br);
108
109    void onPayloadData(
110            unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS,
111            const uint8_t *data, size_t size);
112
113    void extractAACFrames(const sp<ABuffer> &buffer);
114
115    void deferDiscontinuity(DiscontinuityType type);
116
117    DISALLOW_EVIL_CONSTRUCTORS(Stream);
118};
119
120////////////////////////////////////////////////////////////////////////////////
121
122ATSParser::Program::Program(ATSParser *parser, unsigned programMapPID)
123    : mParser(parser),
124      mProgramMapPID(programMapPID),
125      mFirstPTSValid(false),
126      mFirstPTS(0) {
127}
128
129bool ATSParser::Program::parsePID(
130        unsigned pid, unsigned payload_unit_start_indicator,
131        ABitReader *br) {
132    if (pid == mProgramMapPID) {
133        if (payload_unit_start_indicator) {
134            unsigned skip = br->getBits(8);
135            br->skipBits(skip * 8);
136        }
137
138        parseProgramMap(br);
139        return true;
140    }
141
142    ssize_t index = mStreams.indexOfKey(pid);
143    if (index < 0) {
144        return false;
145    }
146
147    mStreams.editValueAt(index)->parse(
148            payload_unit_start_indicator, br);
149
150    return true;
151}
152
153void ATSParser::Program::signalDiscontinuity(DiscontinuityType type) {
154    for (size_t i = 0; i < mStreams.size(); ++i) {
155        mStreams.editValueAt(i)->signalDiscontinuity(type);
156    }
157}
158
159void ATSParser::Program::signalEOS(status_t finalResult) {
160    for (size_t i = 0; i < mStreams.size(); ++i) {
161        mStreams.editValueAt(i)->signalEOS(finalResult);
162    }
163}
164
165struct StreamInfo {
166    unsigned mType;
167    unsigned mPID;
168};
169
170void ATSParser::Program::parseProgramMap(ABitReader *br) {
171    unsigned table_id = br->getBits(8);
172    LOGV("  table_id = %u", table_id);
173    CHECK_EQ(table_id, 0x02u);
174
175    unsigned section_syntax_indicator = br->getBits(1);
176    LOGV("  section_syntax_indicator = %u", section_syntax_indicator);
177    CHECK_EQ(section_syntax_indicator, 1u);
178
179    CHECK_EQ(br->getBits(1), 0u);
180    MY_LOGV("  reserved = %u", br->getBits(2));
181
182    unsigned section_length = br->getBits(12);
183    LOGV("  section_length = %u", section_length);
184    CHECK_EQ(section_length & 0xc00, 0u);
185    CHECK_LE(section_length, 1021u);
186
187    MY_LOGV("  program_number = %u", br->getBits(16));
188    MY_LOGV("  reserved = %u", br->getBits(2));
189    MY_LOGV("  version_number = %u", br->getBits(5));
190    MY_LOGV("  current_next_indicator = %u", br->getBits(1));
191    MY_LOGV("  section_number = %u", br->getBits(8));
192    MY_LOGV("  last_section_number = %u", br->getBits(8));
193    MY_LOGV("  reserved = %u", br->getBits(3));
194    MY_LOGV("  PCR_PID = 0x%04x", br->getBits(13));
195    MY_LOGV("  reserved = %u", br->getBits(4));
196
197    unsigned program_info_length = br->getBits(12);
198    LOGV("  program_info_length = %u", program_info_length);
199    CHECK_EQ(program_info_length & 0xc00, 0u);
200
201    br->skipBits(program_info_length * 8);  // skip descriptors
202
203    Vector<StreamInfo> infos;
204
205    // infoBytesRemaining is the number of bytes that make up the
206    // variable length section of ES_infos. It does not include the
207    // final CRC.
208    size_t infoBytesRemaining = section_length - 9 - program_info_length - 4;
209
210    while (infoBytesRemaining > 0) {
211        CHECK_GE(infoBytesRemaining, 5u);
212
213        unsigned streamType = br->getBits(8);
214        LOGV("    stream_type = 0x%02x", streamType);
215
216        MY_LOGV("    reserved = %u", br->getBits(3));
217
218        unsigned elementaryPID = br->getBits(13);
219        LOGV("    elementary_PID = 0x%04x", elementaryPID);
220
221        MY_LOGV("    reserved = %u", br->getBits(4));
222
223        unsigned ES_info_length = br->getBits(12);
224        LOGV("    ES_info_length = %u", ES_info_length);
225        CHECK_EQ(ES_info_length & 0xc00, 0u);
226
227        CHECK_GE(infoBytesRemaining - 5, ES_info_length);
228
229#if 0
230        br->skipBits(ES_info_length * 8);  // skip descriptors
231#else
232        unsigned info_bytes_remaining = ES_info_length;
233        while (info_bytes_remaining >= 2) {
234            MY_LOGV("      tag = 0x%02x", br->getBits(8));
235
236            unsigned descLength = br->getBits(8);
237            LOGV("      len = %u", descLength);
238
239            CHECK_GE(info_bytes_remaining, 2 + descLength);
240
241            br->skipBits(descLength * 8);
242
243            info_bytes_remaining -= descLength + 2;
244        }
245        CHECK_EQ(info_bytes_remaining, 0u);
246#endif
247
248        StreamInfo info;
249        info.mType = streamType;
250        info.mPID = elementaryPID;
251        infos.push(info);
252
253        infoBytesRemaining -= 5 + ES_info_length;
254    }
255
256    CHECK_EQ(infoBytesRemaining, 0u);
257    MY_LOGV("  CRC = 0x%08x", br->getBits(32));
258
259    bool PIDsChanged = false;
260    for (size_t i = 0; i < infos.size(); ++i) {
261        StreamInfo &info = infos.editItemAt(i);
262
263        ssize_t index = mStreams.indexOfKey(info.mPID);
264
265        if (index >= 0 && mStreams.editValueAt(index)->type() != info.mType) {
266            LOGI("uh oh. stream PIDs have changed.");
267            PIDsChanged = true;
268            break;
269        }
270    }
271
272    if (PIDsChanged) {
273        mStreams.clear();
274    }
275
276    for (size_t i = 0; i < infos.size(); ++i) {
277        StreamInfo &info = infos.editItemAt(i);
278
279        ssize_t index = mStreams.indexOfKey(info.mPID);
280
281        if (index < 0) {
282            sp<Stream> stream = new Stream(this, info.mPID, info.mType);
283            mStreams.add(info.mPID, stream);
284
285            if (PIDsChanged) {
286                stream->signalDiscontinuity(DISCONTINUITY_FORMATCHANGE);
287            }
288        }
289    }
290}
291
292sp<MediaSource> ATSParser::Program::getSource(SourceType type) {
293    size_t index = (type == MPEG2ADTS_AUDIO) ? 0 : 0;
294
295    for (size_t i = 0; i < mStreams.size(); ++i) {
296        sp<MediaSource> source = mStreams.editValueAt(i)->getSource(type);
297        if (source != NULL) {
298            if (index == 0) {
299                return source;
300            }
301            --index;
302        }
303    }
304
305    return NULL;
306}
307
308int64_t ATSParser::Program::convertPTSToTimestamp(uint64_t PTS) {
309    if (!mFirstPTSValid) {
310        mFirstPTSValid = true;
311        mFirstPTS = PTS;
312        PTS = 0;
313    } else if (PTS < mFirstPTS) {
314        PTS = 0;
315    } else {
316        PTS -= mFirstPTS;
317    }
318
319    return (PTS * 100) / 9;
320}
321
322////////////////////////////////////////////////////////////////////////////////
323
324ATSParser::Stream::Stream(
325        Program *program, unsigned elementaryPID, unsigned streamType)
326    : mProgram(program),
327      mElementaryPID(elementaryPID),
328      mStreamType(streamType),
329      mBuffer(new ABuffer(192 * 1024)),
330      mPayloadStarted(false),
331      mPendingDiscontinuity(DISCONTINUITY_NONE),
332      mQueue(streamType == 0x1b
333              ? ElementaryStreamQueue::H264 : ElementaryStreamQueue::AAC) {
334    mBuffer->setRange(0, 0);
335
336    LOGV("new stream PID 0x%02x, type 0x%02x", elementaryPID, streamType);
337}
338
339ATSParser::Stream::~Stream() {
340}
341
342void ATSParser::Stream::parse(
343        unsigned payload_unit_start_indicator, ABitReader *br) {
344    if (payload_unit_start_indicator) {
345        if (mPayloadStarted) {
346            // Otherwise we run the danger of receiving the trailing bytes
347            // of a PES packet that we never saw the start of and assuming
348            // we have a a complete PES packet.
349
350            flush();
351        }
352
353        mPayloadStarted = true;
354    }
355
356    if (!mPayloadStarted) {
357        return;
358    }
359
360    size_t payloadSizeBits = br->numBitsLeft();
361    CHECK_EQ(payloadSizeBits % 8, 0u);
362
363    CHECK_LE(mBuffer->size() + payloadSizeBits / 8, mBuffer->capacity());
364
365    memcpy(mBuffer->data() + mBuffer->size(), br->data(), payloadSizeBits / 8);
366    mBuffer->setRange(0, mBuffer->size() + payloadSizeBits / 8);
367}
368
369void ATSParser::Stream::signalDiscontinuity(DiscontinuityType type) {
370    mPayloadStarted = false;
371    mBuffer->setRange(0, 0);
372
373    switch (type) {
374        case DISCONTINUITY_SEEK:
375        case DISCONTINUITY_FORMATCHANGE:
376        {
377            bool isASeek = (type == DISCONTINUITY_SEEK);
378
379            mQueue.clear(!isASeek);
380
381            if (mSource != NULL) {
382                mSource->queueDiscontinuity(type);
383            } else {
384                deferDiscontinuity(type);
385            }
386            break;
387        }
388
389        default:
390            TRESPASS();
391            break;
392    }
393}
394
395void ATSParser::Stream::deferDiscontinuity(DiscontinuityType type) {
396    if (type > mPendingDiscontinuity) {
397        // Only upgrade discontinuities.
398        mPendingDiscontinuity = type;
399    }
400}
401
402void ATSParser::Stream::signalEOS(status_t finalResult) {
403    if (mSource != NULL) {
404        mSource->signalEOS(finalResult);
405    }
406}
407
408void ATSParser::Stream::parsePES(ABitReader *br) {
409    unsigned packet_startcode_prefix = br->getBits(24);
410
411    LOGV("packet_startcode_prefix = 0x%08x", packet_startcode_prefix);
412
413    CHECK_EQ(packet_startcode_prefix, 0x000001u);
414
415    unsigned stream_id = br->getBits(8);
416    LOGV("stream_id = 0x%02x", stream_id);
417
418    unsigned PES_packet_length = br->getBits(16);
419    LOGV("PES_packet_length = %u", PES_packet_length);
420
421    if (stream_id != 0xbc  // program_stream_map
422            && stream_id != 0xbe  // padding_stream
423            && stream_id != 0xbf  // private_stream_2
424            && stream_id != 0xf0  // ECM
425            && stream_id != 0xf1  // EMM
426            && stream_id != 0xff  // program_stream_directory
427            && stream_id != 0xf2  // DSMCC
428            && stream_id != 0xf8) {  // H.222.1 type E
429        CHECK_EQ(br->getBits(2), 2u);
430
431        MY_LOGV("PES_scrambling_control = %u", br->getBits(2));
432        MY_LOGV("PES_priority = %u", br->getBits(1));
433        MY_LOGV("data_alignment_indicator = %u", br->getBits(1));
434        MY_LOGV("copyright = %u", br->getBits(1));
435        MY_LOGV("original_or_copy = %u", br->getBits(1));
436
437        unsigned PTS_DTS_flags = br->getBits(2);
438        LOGV("PTS_DTS_flags = %u", PTS_DTS_flags);
439
440        unsigned ESCR_flag = br->getBits(1);
441        LOGV("ESCR_flag = %u", ESCR_flag);
442
443        unsigned ES_rate_flag = br->getBits(1);
444        LOGV("ES_rate_flag = %u", ES_rate_flag);
445
446        unsigned DSM_trick_mode_flag = br->getBits(1);
447        LOGV("DSM_trick_mode_flag = %u", DSM_trick_mode_flag);
448
449        unsigned additional_copy_info_flag = br->getBits(1);
450        LOGV("additional_copy_info_flag = %u", additional_copy_info_flag);
451
452        MY_LOGV("PES_CRC_flag = %u", br->getBits(1));
453        MY_LOGV("PES_extension_flag = %u", br->getBits(1));
454
455        unsigned PES_header_data_length = br->getBits(8);
456        LOGV("PES_header_data_length = %u", PES_header_data_length);
457
458        unsigned optional_bytes_remaining = PES_header_data_length;
459
460        uint64_t PTS = 0, DTS = 0;
461
462        if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) {
463            CHECK_GE(optional_bytes_remaining, 5u);
464
465            CHECK_EQ(br->getBits(4), PTS_DTS_flags);
466
467            PTS = ((uint64_t)br->getBits(3)) << 30;
468            CHECK_EQ(br->getBits(1), 1u);
469            PTS |= ((uint64_t)br->getBits(15)) << 15;
470            CHECK_EQ(br->getBits(1), 1u);
471            PTS |= br->getBits(15);
472            CHECK_EQ(br->getBits(1), 1u);
473
474            LOGV("PTS = %llu", PTS);
475            // LOGI("PTS = %.2f secs", PTS / 90000.0f);
476
477            optional_bytes_remaining -= 5;
478
479            if (PTS_DTS_flags == 3) {
480                CHECK_GE(optional_bytes_remaining, 5u);
481
482                CHECK_EQ(br->getBits(4), 1u);
483
484                DTS = ((uint64_t)br->getBits(3)) << 30;
485                CHECK_EQ(br->getBits(1), 1u);
486                DTS |= ((uint64_t)br->getBits(15)) << 15;
487                CHECK_EQ(br->getBits(1), 1u);
488                DTS |= br->getBits(15);
489                CHECK_EQ(br->getBits(1), 1u);
490
491                LOGV("DTS = %llu", DTS);
492
493                optional_bytes_remaining -= 5;
494            }
495        }
496
497        if (ESCR_flag) {
498            CHECK_GE(optional_bytes_remaining, 6u);
499
500            br->getBits(2);
501
502            uint64_t ESCR = ((uint64_t)br->getBits(3)) << 30;
503            CHECK_EQ(br->getBits(1), 1u);
504            ESCR |= ((uint64_t)br->getBits(15)) << 15;
505            CHECK_EQ(br->getBits(1), 1u);
506            ESCR |= br->getBits(15);
507            CHECK_EQ(br->getBits(1), 1u);
508
509            LOGV("ESCR = %llu", ESCR);
510            MY_LOGV("ESCR_extension = %u", br->getBits(9));
511
512            CHECK_EQ(br->getBits(1), 1u);
513
514            optional_bytes_remaining -= 6;
515        }
516
517        if (ES_rate_flag) {
518            CHECK_GE(optional_bytes_remaining, 3u);
519
520            CHECK_EQ(br->getBits(1), 1u);
521            MY_LOGV("ES_rate = %u", br->getBits(22));
522            CHECK_EQ(br->getBits(1), 1u);
523
524            optional_bytes_remaining -= 3;
525        }
526
527        br->skipBits(optional_bytes_remaining * 8);
528
529        // ES data follows.
530
531        if (PES_packet_length != 0) {
532            CHECK_GE(PES_packet_length, PES_header_data_length + 3);
533
534            unsigned dataLength =
535                PES_packet_length - 3 - PES_header_data_length;
536
537            CHECK_GE(br->numBitsLeft(), dataLength * 8);
538
539            onPayloadData(
540                    PTS_DTS_flags, PTS, DTS, br->data(), dataLength);
541
542            br->skipBits(dataLength * 8);
543        } else {
544            onPayloadData(
545                    PTS_DTS_flags, PTS, DTS,
546                    br->data(), br->numBitsLeft() / 8);
547
548            size_t payloadSizeBits = br->numBitsLeft();
549            CHECK_EQ(payloadSizeBits % 8, 0u);
550
551            LOGV("There's %d bytes of payload.", payloadSizeBits / 8);
552        }
553    } else if (stream_id == 0xbe) {  // padding_stream
554        CHECK_NE(PES_packet_length, 0u);
555        br->skipBits(PES_packet_length * 8);
556    } else {
557        CHECK_NE(PES_packet_length, 0u);
558        br->skipBits(PES_packet_length * 8);
559    }
560}
561
562void ATSParser::Stream::flush() {
563    if (mBuffer->size() == 0) {
564        return;
565    }
566
567    LOGV("flushing stream 0x%04x size = %d", mElementaryPID, mBuffer->size());
568
569    ABitReader br(mBuffer->data(), mBuffer->size());
570    parsePES(&br);
571
572    mBuffer->setRange(0, 0);
573}
574
575void ATSParser::Stream::onPayloadData(
576        unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS,
577        const uint8_t *data, size_t size) {
578    LOGV("onPayloadData mStreamType=0x%02x", mStreamType);
579
580    CHECK(PTS_DTS_flags == 2 || PTS_DTS_flags == 3);
581    int64_t timeUs = mProgram->convertPTSToTimestamp(PTS);
582
583    status_t err = mQueue.appendData(data, size, timeUs);
584
585    if (err != OK) {
586        return;
587    }
588
589    sp<ABuffer> accessUnit;
590    while ((accessUnit = mQueue.dequeueAccessUnit()) != NULL) {
591        if (mSource == NULL) {
592            sp<MetaData> meta = mQueue.getFormat();
593
594            if (meta != NULL) {
595                LOGV("created source!");
596                mSource = new AnotherPacketSource(meta);
597
598                if (mPendingDiscontinuity != DISCONTINUITY_NONE) {
599                    mSource->queueDiscontinuity(mPendingDiscontinuity);
600                    mPendingDiscontinuity = DISCONTINUITY_NONE;
601                }
602
603                mSource->queueAccessUnit(accessUnit);
604            }
605        } else if (mQueue.getFormat() != NULL) {
606            // After a discontinuity we invalidate the queue's format
607            // and won't enqueue any access units to the source until
608            // the queue has reestablished the new format.
609
610            if (mSource->getFormat() == NULL) {
611                mSource->setFormat(mQueue.getFormat());
612            }
613            mSource->queueAccessUnit(accessUnit);
614        }
615    }
616}
617
618sp<MediaSource> ATSParser::Stream::getSource(SourceType type) {
619    if ((type == AVC_VIDEO && mStreamType == 0x1b)
620        || (type == MPEG2ADTS_AUDIO && mStreamType == 0x0f)) {
621        return mSource;
622    }
623
624    return NULL;
625}
626
627////////////////////////////////////////////////////////////////////////////////
628
629ATSParser::ATSParser() {
630}
631
632ATSParser::~ATSParser() {
633}
634
635void ATSParser::feedTSPacket(const void *data, size_t size) {
636    CHECK_EQ(size, kTSPacketSize);
637
638    ABitReader br((const uint8_t *)data, kTSPacketSize);
639    parseTS(&br);
640}
641
642void ATSParser::signalDiscontinuity(DiscontinuityType type) {
643    for (size_t i = 0; i < mPrograms.size(); ++i) {
644        mPrograms.editItemAt(i)->signalDiscontinuity(type);
645    }
646}
647
648void ATSParser::signalEOS(status_t finalResult) {
649    CHECK_NE(finalResult, (status_t)OK);
650
651    for (size_t i = 0; i < mPrograms.size(); ++i) {
652        mPrograms.editItemAt(i)->signalEOS(finalResult);
653    }
654}
655
656void ATSParser::parseProgramAssociationTable(ABitReader *br) {
657    unsigned table_id = br->getBits(8);
658    LOGV("  table_id = %u", table_id);
659    CHECK_EQ(table_id, 0x00u);
660
661    unsigned section_syntax_indictor = br->getBits(1);
662    LOGV("  section_syntax_indictor = %u", section_syntax_indictor);
663    CHECK_EQ(section_syntax_indictor, 1u);
664
665    CHECK_EQ(br->getBits(1), 0u);
666    MY_LOGV("  reserved = %u", br->getBits(2));
667
668    unsigned section_length = br->getBits(12);
669    LOGV("  section_length = %u", section_length);
670    CHECK_EQ(section_length & 0xc00, 0u);
671
672    MY_LOGV("  transport_stream_id = %u", br->getBits(16));
673    MY_LOGV("  reserved = %u", br->getBits(2));
674    MY_LOGV("  version_number = %u", br->getBits(5));
675    MY_LOGV("  current_next_indicator = %u", br->getBits(1));
676    MY_LOGV("  section_number = %u", br->getBits(8));
677    MY_LOGV("  last_section_number = %u", br->getBits(8));
678
679    size_t numProgramBytes = (section_length - 5 /* header */ - 4 /* crc */);
680    CHECK_EQ((numProgramBytes % 4), 0u);
681
682    for (size_t i = 0; i < numProgramBytes / 4; ++i) {
683        unsigned program_number = br->getBits(16);
684        LOGV("    program_number = %u", program_number);
685
686        MY_LOGV("    reserved = %u", br->getBits(3));
687
688        if (program_number == 0) {
689            MY_LOGV("    network_PID = 0x%04x", br->getBits(13));
690        } else {
691            unsigned programMapPID = br->getBits(13);
692
693            LOGV("    program_map_PID = 0x%04x", programMapPID);
694
695            mPrograms.push(new Program(this, programMapPID));
696        }
697    }
698
699    MY_LOGV("  CRC = 0x%08x", br->getBits(32));
700}
701
702void ATSParser::parsePID(
703        ABitReader *br, unsigned PID,
704        unsigned payload_unit_start_indicator) {
705    if (PID == 0) {
706        if (payload_unit_start_indicator) {
707            unsigned skip = br->getBits(8);
708            br->skipBits(skip * 8);
709        }
710        parseProgramAssociationTable(br);
711        return;
712    }
713
714    bool handled = false;
715    for (size_t i = 0; i < mPrograms.size(); ++i) {
716        if (mPrograms.editItemAt(i)->parsePID(
717                    PID, payload_unit_start_indicator, br)) {
718            handled = true;
719            break;
720        }
721    }
722
723    if (!handled) {
724        LOGV("PID 0x%04x not handled.", PID);
725    }
726}
727
728void ATSParser::parseAdaptationField(ABitReader *br) {
729    unsigned adaptation_field_length = br->getBits(8);
730    if (adaptation_field_length > 0) {
731        br->skipBits(adaptation_field_length * 8);  // XXX
732    }
733}
734
735void ATSParser::parseTS(ABitReader *br) {
736    LOGV("---");
737
738    unsigned sync_byte = br->getBits(8);
739    CHECK_EQ(sync_byte, 0x47u);
740
741    MY_LOGV("transport_error_indicator = %u", br->getBits(1));
742
743    unsigned payload_unit_start_indicator = br->getBits(1);
744    LOGV("payload_unit_start_indicator = %u", payload_unit_start_indicator);
745
746    MY_LOGV("transport_priority = %u", br->getBits(1));
747
748    unsigned PID = br->getBits(13);
749    LOGV("PID = 0x%04x", PID);
750
751    MY_LOGV("transport_scrambling_control = %u", br->getBits(2));
752
753    unsigned adaptation_field_control = br->getBits(2);
754    LOGV("adaptation_field_control = %u", adaptation_field_control);
755
756    unsigned continuity_counter = br->getBits(4);
757    LOGV("continuity_counter = %u", continuity_counter);
758
759    // LOGI("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter);
760
761    if (adaptation_field_control == 2 || adaptation_field_control == 3) {
762        parseAdaptationField(br);
763    }
764
765    if (adaptation_field_control == 1 || adaptation_field_control == 3) {
766        parsePID(br, PID, payload_unit_start_indicator);
767    }
768}
769
770sp<MediaSource> ATSParser::getSource(SourceType type) {
771    for (size_t i = 0; i < mPrograms.size(); ++i) {
772        sp<MediaSource> source = mPrograms.editItemAt(i)->getSource(type);
773
774        if (source != NULL) {
775            return source;
776        }
777    }
778
779    return NULL;
780}
781
782bool ATSParser::PTSTimeDeltaEstablished() {
783    if (mPrograms.isEmpty()) {
784        return false;
785    }
786
787    return mPrograms.editItemAt(0)->PTSTimeDeltaEstablished();
788}
789
790}  // namespace android
791