ATSParser.cpp revision 386d609dc513e838c7e7c4c46c604493ccd560be 
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 <media/IStreamSource.h>
36#include <utils/KeyedVector.h>
37
38namespace android {
39
40// I want the expression "y" evaluated even if verbose logging is off.
41#define MY_LOGV(x, y) \
42    do { unsigned tmp = y; LOGV(x, tmp); } while (0)
43
44static const size_t kTSPacketSize = 188;
45
46struct ATSParser::Program : public RefBase {
47    Program(ATSParser *parser, unsigned programNumber, unsigned programMapPID);
48
49    bool parsePID(
50            unsigned pid, unsigned payload_unit_start_indicator,
51            ABitReader *br);
52
53    void signalDiscontinuity(
54            DiscontinuityType type, const sp<AMessage> &extra);
55
56    void signalEOS(status_t finalResult);
57
58    sp<MediaSource> getSource(SourceType type);
59
60    int64_t convertPTSToTimestamp(uint64_t PTS);
61
62    bool PTSTimeDeltaEstablished() const {
63        return mFirstPTSValid;
64    }
65
66    unsigned number() const { return mProgramNumber; }
67
68    void updateProgramMapPID(unsigned programMapPID) {
69        mProgramMapPID = programMapPID;
70    }
71
72private:
73    ATSParser *mParser;
74    unsigned mProgramNumber;
75    unsigned mProgramMapPID;
76    KeyedVector<unsigned, sp<Stream> > mStreams;
77    bool mFirstPTSValid;
78    uint64_t mFirstPTS;
79
80    void parseProgramMap(ABitReader *br);
81
82    DISALLOW_EVIL_CONSTRUCTORS(Program);
83};
84
85struct ATSParser::Stream : public RefBase {
86    Stream(Program *program, unsigned elementaryPID, unsigned streamType);
87
88    unsigned type() const { return mStreamType; }
89    unsigned pid() const { return mElementaryPID; }
90    void setPID(unsigned pid) { mElementaryPID = pid; }
91
92    void parse(
93            unsigned payload_unit_start_indicator,
94            ABitReader *br);
95
96    void signalDiscontinuity(
97            DiscontinuityType type, const sp<AMessage> &extra);
98
99    void signalEOS(status_t finalResult);
100
101    sp<MediaSource> getSource(SourceType type);
102
103protected:
104    virtual ~Stream();
105
106private:
107    Program *mProgram;
108    unsigned mElementaryPID;
109    unsigned mStreamType;
110
111    sp<ABuffer> mBuffer;
112    sp<AnotherPacketSource> mSource;
113    bool mPayloadStarted;
114    DiscontinuityType mPendingDiscontinuity;
115    sp<AMessage> mPendingDiscontinuityExtra;
116
117    ElementaryStreamQueue *mQueue;
118
119    void flush();
120    void parsePES(ABitReader *br);
121
122    void onPayloadData(
123            unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS,
124            const uint8_t *data, size_t size);
125
126    void extractAACFrames(const sp<ABuffer> &buffer);
127
128    void deferDiscontinuity(
129            DiscontinuityType type, const sp<AMessage> &extra);
130
131    DISALLOW_EVIL_CONSTRUCTORS(Stream);
132};
133
134////////////////////////////////////////////////////////////////////////////////
135
136ATSParser::Program::Program(
137        ATSParser *parser, unsigned programNumber, unsigned programMapPID)
138    : mParser(parser),
139      mProgramNumber(programNumber),
140      mProgramMapPID(programMapPID),
141      mFirstPTSValid(false),
142      mFirstPTS(0) {
143    LOGV("new program number %u", programNumber);
144}
145
146bool ATSParser::Program::parsePID(
147        unsigned pid, unsigned payload_unit_start_indicator,
148        ABitReader *br) {
149    if (pid == mProgramMapPID) {
150        if (payload_unit_start_indicator) {
151            unsigned skip = br->getBits(8);
152            br->skipBits(skip * 8);
153        }
154
155        parseProgramMap(br);
156        return true;
157    }
158
159    ssize_t index = mStreams.indexOfKey(pid);
160    if (index < 0) {
161        return false;
162    }
163
164    mStreams.editValueAt(index)->parse(
165            payload_unit_start_indicator, br);
166
167    return true;
168}
169
170void ATSParser::Program::signalDiscontinuity(
171        DiscontinuityType type, const sp<AMessage> &extra) {
172    for (size_t i = 0; i < mStreams.size(); ++i) {
173        mStreams.editValueAt(i)->signalDiscontinuity(type, extra);
174    }
175}
176
177void ATSParser::Program::signalEOS(status_t finalResult) {
178    for (size_t i = 0; i < mStreams.size(); ++i) {
179        mStreams.editValueAt(i)->signalEOS(finalResult);
180    }
181}
182
183struct StreamInfo {
184    unsigned mType;
185    unsigned mPID;
186};
187
188void ATSParser::Program::parseProgramMap(ABitReader *br) {
189    unsigned table_id = br->getBits(8);
190    LOGV("  table_id = %u", table_id);
191    CHECK_EQ(table_id, 0x02u);
192
193    unsigned section_syntax_indicator = br->getBits(1);
194    LOGV("  section_syntax_indicator = %u", section_syntax_indicator);
195    CHECK_EQ(section_syntax_indicator, 1u);
196
197    CHECK_EQ(br->getBits(1), 0u);
198    MY_LOGV("  reserved = %u", br->getBits(2));
199
200    unsigned section_length = br->getBits(12);
201    LOGV("  section_length = %u", section_length);
202    CHECK_EQ(section_length & 0xc00, 0u);
203    CHECK_LE(section_length, 1021u);
204
205    MY_LOGV("  program_number = %u", br->getBits(16));
206    MY_LOGV("  reserved = %u", br->getBits(2));
207    MY_LOGV("  version_number = %u", br->getBits(5));
208    MY_LOGV("  current_next_indicator = %u", br->getBits(1));
209    MY_LOGV("  section_number = %u", br->getBits(8));
210    MY_LOGV("  last_section_number = %u", br->getBits(8));
211    MY_LOGV("  reserved = %u", br->getBits(3));
212    MY_LOGV("  PCR_PID = 0x%04x", br->getBits(13));
213    MY_LOGV("  reserved = %u", br->getBits(4));
214
215    unsigned program_info_length = br->getBits(12);
216    LOGV("  program_info_length = %u", program_info_length);
217    CHECK_EQ(program_info_length & 0xc00, 0u);
218
219    br->skipBits(program_info_length * 8);  // skip descriptors
220
221    Vector<StreamInfo> infos;
222
223    // infoBytesRemaining is the number of bytes that make up the
224    // variable length section of ES_infos. It does not include the
225    // final CRC.
226    size_t infoBytesRemaining = section_length - 9 - program_info_length - 4;
227
228    while (infoBytesRemaining > 0) {
229        CHECK_GE(infoBytesRemaining, 5u);
230
231        unsigned streamType = br->getBits(8);
232        LOGV("    stream_type = 0x%02x", streamType);
233
234        MY_LOGV("    reserved = %u", br->getBits(3));
235
236        unsigned elementaryPID = br->getBits(13);
237        LOGV("    elementary_PID = 0x%04x", elementaryPID);
238
239        MY_LOGV("    reserved = %u", br->getBits(4));
240
241        unsigned ES_info_length = br->getBits(12);
242        LOGV("    ES_info_length = %u", ES_info_length);
243        CHECK_EQ(ES_info_length & 0xc00, 0u);
244
245        CHECK_GE(infoBytesRemaining - 5, ES_info_length);
246
247#if 0
248        br->skipBits(ES_info_length * 8);  // skip descriptors
249#else
250        unsigned info_bytes_remaining = ES_info_length;
251        while (info_bytes_remaining >= 2) {
252            MY_LOGV("      tag = 0x%02x", br->getBits(8));
253
254            unsigned descLength = br->getBits(8);
255            LOGV("      len = %u", descLength);
256
257            CHECK_GE(info_bytes_remaining, 2 + descLength);
258
259            br->skipBits(descLength * 8);
260
261            info_bytes_remaining -= descLength + 2;
262        }
263        CHECK_EQ(info_bytes_remaining, 0u);
264#endif
265
266        StreamInfo info;
267        info.mType = streamType;
268        info.mPID = elementaryPID;
269        infos.push(info);
270
271        infoBytesRemaining -= 5 + ES_info_length;
272    }
273
274    CHECK_EQ(infoBytesRemaining, 0u);
275    MY_LOGV("  CRC = 0x%08x", br->getBits(32));
276
277    bool PIDsChanged = false;
278    for (size_t i = 0; i < infos.size(); ++i) {
279        StreamInfo &info = infos.editItemAt(i);
280
281        ssize_t index = mStreams.indexOfKey(info.mPID);
282
283        if (index >= 0 && mStreams.editValueAt(index)->type() != info.mType) {
284            LOGI("uh oh. stream PIDs have changed.");
285            PIDsChanged = true;
286            break;
287        }
288    }
289
290    if (PIDsChanged) {
291        mStreams.clear();
292    }
293
294    for (size_t i = 0; i < infos.size(); ++i) {
295        StreamInfo &info = infos.editItemAt(i);
296
297        ssize_t index = mStreams.indexOfKey(info.mPID);
298
299        if (index < 0) {
300            sp<Stream> stream = new Stream(this, info.mPID, info.mType);
301            mStreams.add(info.mPID, stream);
302
303            if (PIDsChanged) {
304                sp<AMessage> extra;
305                stream->signalDiscontinuity(DISCONTINUITY_FORMATCHANGE, extra);
306            }
307        }
308    }
309}
310
311sp<MediaSource> ATSParser::Program::getSource(SourceType type) {
312    size_t index = (type == AUDIO) ? 0 : 0;
313
314    for (size_t i = 0; i < mStreams.size(); ++i) {
315        sp<MediaSource> source = mStreams.editValueAt(i)->getSource(type);
316        if (source != NULL) {
317            if (index == 0) {
318                return source;
319            }
320            --index;
321        }
322    }
323
324    return NULL;
325}
326
327int64_t ATSParser::Program::convertPTSToTimestamp(uint64_t PTS) {
328    if (!mFirstPTSValid) {
329        mFirstPTSValid = true;
330        mFirstPTS = PTS;
331        PTS = 0;
332    } else if (PTS < mFirstPTS) {
333        PTS = 0;
334    } else {
335        PTS -= mFirstPTS;
336    }
337
338    return (PTS * 100) / 9;
339}
340
341////////////////////////////////////////////////////////////////////////////////
342
343ATSParser::Stream::Stream(
344        Program *program, unsigned elementaryPID, unsigned streamType)
345    : mProgram(program),
346      mElementaryPID(elementaryPID),
347      mStreamType(streamType),
348      mBuffer(new ABuffer(192 * 1024)),
349      mPayloadStarted(false),
350      mPendingDiscontinuity(DISCONTINUITY_NONE),
351      mQueue(NULL) {
352    mBuffer->setRange(0, 0);
353
354    switch (mStreamType) {
355        case STREAMTYPE_H264:
356            mQueue = new ElementaryStreamQueue(ElementaryStreamQueue::H264);
357            break;
358        case STREAMTYPE_MPEG2_AUDIO_ATDS:
359            mQueue = new ElementaryStreamQueue(ElementaryStreamQueue::AAC);
360            break;
361        case STREAMTYPE_MPEG1_AUDIO:
362        case STREAMTYPE_MPEG2_AUDIO:
363            mQueue = new ElementaryStreamQueue(
364                    ElementaryStreamQueue::MPEG_AUDIO);
365            break;
366
367        case STREAMTYPE_MPEG1_VIDEO:
368        case STREAMTYPE_MPEG2_VIDEO:
369            mQueue = new ElementaryStreamQueue(
370                    ElementaryStreamQueue::MPEG_VIDEO);
371            break;
372
373        case STREAMTYPE_MPEG4_VIDEO:
374            mQueue = new ElementaryStreamQueue(
375                    ElementaryStreamQueue::MPEG4_VIDEO);
376            break;
377
378        default:
379            break;
380    }
381
382    LOGV("new stream PID 0x%02x, type 0x%02x", elementaryPID, streamType);
383}
384
385ATSParser::Stream::~Stream() {
386    delete mQueue;
387    mQueue = NULL;
388}
389
390void ATSParser::Stream::parse(
391        unsigned payload_unit_start_indicator, ABitReader *br) {
392    if (payload_unit_start_indicator) {
393        if (mPayloadStarted) {
394            // Otherwise we run the danger of receiving the trailing bytes
395            // of a PES packet that we never saw the start of and assuming
396            // we have a a complete PES packet.
397
398            flush();
399        }
400
401        mPayloadStarted = true;
402    }
403
404    if (!mPayloadStarted) {
405        return;
406    }
407
408    size_t payloadSizeBits = br->numBitsLeft();
409    CHECK_EQ(payloadSizeBits % 8, 0u);
410
411    size_t neededSize = mBuffer->size() + payloadSizeBits / 8;
412    if (mBuffer->capacity() < neededSize) {
413        // Increment in multiples of 64K.
414        neededSize = (neededSize + 65535) & ~65535;
415
416        LOGI("resizing buffer to %d bytes", neededSize);
417
418        sp<ABuffer> newBuffer = new ABuffer(neededSize);
419        memcpy(newBuffer->data(), mBuffer->data(), mBuffer->size());
420        newBuffer->setRange(0, mBuffer->size());
421        mBuffer = newBuffer;
422    }
423
424    memcpy(mBuffer->data() + mBuffer->size(), br->data(), payloadSizeBits / 8);
425    mBuffer->setRange(0, mBuffer->size() + payloadSizeBits / 8);
426}
427
428void ATSParser::Stream::signalDiscontinuity(
429        DiscontinuityType type, const sp<AMessage> &extra) {
430    mPayloadStarted = false;
431    mBuffer->setRange(0, 0);
432
433    switch (type) {
434        case DISCONTINUITY_SEEK:
435        case DISCONTINUITY_FORMATCHANGE:
436        {
437            bool isASeek = (type == DISCONTINUITY_SEEK);
438
439            mQueue->clear(!isASeek);
440
441            uint64_t resumeAtPTS;
442            if (extra != NULL
443                    && extra->findInt64(
444                        IStreamListener::kKeyResumeAtPTS,
445                        (int64_t *)&resumeAtPTS)) {
446                int64_t resumeAtMediaTimeUs =
447                    mProgram->convertPTSToTimestamp(resumeAtPTS);
448
449                extra->setInt64("resume-at-mediatimeUs", resumeAtMediaTimeUs);
450            }
451
452            if (mSource != NULL) {
453                mSource->queueDiscontinuity(type, extra);
454            } else {
455                deferDiscontinuity(type, extra);
456            }
457            break;
458        }
459
460        default:
461            TRESPASS();
462            break;
463    }
464}
465
466void ATSParser::Stream::deferDiscontinuity(
467        DiscontinuityType type, const sp<AMessage> &extra) {
468    if (type > mPendingDiscontinuity) {
469        // Only upgrade discontinuities.
470        mPendingDiscontinuity = type;
471        mPendingDiscontinuityExtra = extra;
472    }
473}
474
475void ATSParser::Stream::signalEOS(status_t finalResult) {
476    if (mSource != NULL) {
477        mSource->signalEOS(finalResult);
478    }
479}
480
481void ATSParser::Stream::parsePES(ABitReader *br) {
482    unsigned packet_startcode_prefix = br->getBits(24);
483
484    LOGV("packet_startcode_prefix = 0x%08x", packet_startcode_prefix);
485
486    if (packet_startcode_prefix != 1) {
487        LOGV("Supposedly payload_unit_start=1 unit does not start "
488             "with startcode.");
489        return;
490    }
491
492    CHECK_EQ(packet_startcode_prefix, 0x000001u);
493
494    unsigned stream_id = br->getBits(8);
495    LOGV("stream_id = 0x%02x", stream_id);
496
497    unsigned PES_packet_length = br->getBits(16);
498    LOGV("PES_packet_length = %u", PES_packet_length);
499
500    if (stream_id != 0xbc  // program_stream_map
501            && stream_id != 0xbe  // padding_stream
502            && stream_id != 0xbf  // private_stream_2
503            && stream_id != 0xf0  // ECM
504            && stream_id != 0xf1  // EMM
505            && stream_id != 0xff  // program_stream_directory
506            && stream_id != 0xf2  // DSMCC
507            && stream_id != 0xf8) {  // H.222.1 type E
508        CHECK_EQ(br->getBits(2), 2u);
509
510        MY_LOGV("PES_scrambling_control = %u", br->getBits(2));
511        MY_LOGV("PES_priority = %u", br->getBits(1));
512        MY_LOGV("data_alignment_indicator = %u", br->getBits(1));
513        MY_LOGV("copyright = %u", br->getBits(1));
514        MY_LOGV("original_or_copy = %u", br->getBits(1));
515
516        unsigned PTS_DTS_flags = br->getBits(2);
517        LOGV("PTS_DTS_flags = %u", PTS_DTS_flags);
518
519        unsigned ESCR_flag = br->getBits(1);
520        LOGV("ESCR_flag = %u", ESCR_flag);
521
522        unsigned ES_rate_flag = br->getBits(1);
523        LOGV("ES_rate_flag = %u", ES_rate_flag);
524
525        unsigned DSM_trick_mode_flag = br->getBits(1);
526        LOGV("DSM_trick_mode_flag = %u", DSM_trick_mode_flag);
527
528        unsigned additional_copy_info_flag = br->getBits(1);
529        LOGV("additional_copy_info_flag = %u", additional_copy_info_flag);
530
531        MY_LOGV("PES_CRC_flag = %u", br->getBits(1));
532        MY_LOGV("PES_extension_flag = %u", br->getBits(1));
533
534        unsigned PES_header_data_length = br->getBits(8);
535        LOGV("PES_header_data_length = %u", PES_header_data_length);
536
537        unsigned optional_bytes_remaining = PES_header_data_length;
538
539        uint64_t PTS = 0, DTS = 0;
540
541        if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) {
542            CHECK_GE(optional_bytes_remaining, 5u);
543
544            CHECK_EQ(br->getBits(4), PTS_DTS_flags);
545
546            PTS = ((uint64_t)br->getBits(3)) << 30;
547            CHECK_EQ(br->getBits(1), 1u);
548            PTS |= ((uint64_t)br->getBits(15)) << 15;
549            CHECK_EQ(br->getBits(1), 1u);
550            PTS |= br->getBits(15);
551            CHECK_EQ(br->getBits(1), 1u);
552
553            LOGV("PTS = %llu", PTS);
554            // LOGI("PTS = %.2f secs", PTS / 90000.0f);
555
556            optional_bytes_remaining -= 5;
557
558            if (PTS_DTS_flags == 3) {
559                CHECK_GE(optional_bytes_remaining, 5u);
560
561                CHECK_EQ(br->getBits(4), 1u);
562
563                DTS = ((uint64_t)br->getBits(3)) << 30;
564                CHECK_EQ(br->getBits(1), 1u);
565                DTS |= ((uint64_t)br->getBits(15)) << 15;
566                CHECK_EQ(br->getBits(1), 1u);
567                DTS |= br->getBits(15);
568                CHECK_EQ(br->getBits(1), 1u);
569
570                LOGV("DTS = %llu", DTS);
571
572                optional_bytes_remaining -= 5;
573            }
574        }
575
576        if (ESCR_flag) {
577            CHECK_GE(optional_bytes_remaining, 6u);
578
579            br->getBits(2);
580
581            uint64_t ESCR = ((uint64_t)br->getBits(3)) << 30;
582            CHECK_EQ(br->getBits(1), 1u);
583            ESCR |= ((uint64_t)br->getBits(15)) << 15;
584            CHECK_EQ(br->getBits(1), 1u);
585            ESCR |= br->getBits(15);
586            CHECK_EQ(br->getBits(1), 1u);
587
588            LOGV("ESCR = %llu", ESCR);
589            MY_LOGV("ESCR_extension = %u", br->getBits(9));
590
591            CHECK_EQ(br->getBits(1), 1u);
592
593            optional_bytes_remaining -= 6;
594        }
595
596        if (ES_rate_flag) {
597            CHECK_GE(optional_bytes_remaining, 3u);
598
599            CHECK_EQ(br->getBits(1), 1u);
600            MY_LOGV("ES_rate = %u", br->getBits(22));
601            CHECK_EQ(br->getBits(1), 1u);
602
603            optional_bytes_remaining -= 3;
604        }
605
606        br->skipBits(optional_bytes_remaining * 8);
607
608        // ES data follows.
609
610        if (PES_packet_length != 0) {
611            CHECK_GE(PES_packet_length, PES_header_data_length + 3);
612
613            unsigned dataLength =
614                PES_packet_length - 3 - PES_header_data_length;
615
616            CHECK_GE(br->numBitsLeft(), dataLength * 8);
617
618            onPayloadData(
619                    PTS_DTS_flags, PTS, DTS, br->data(), dataLength);
620
621            br->skipBits(dataLength * 8);
622        } else {
623            onPayloadData(
624                    PTS_DTS_flags, PTS, DTS,
625                    br->data(), br->numBitsLeft() / 8);
626
627            size_t payloadSizeBits = br->numBitsLeft();
628            CHECK_EQ(payloadSizeBits % 8, 0u);
629
630            LOGV("There's %d bytes of payload.", payloadSizeBits / 8);
631        }
632    } else if (stream_id == 0xbe) {  // padding_stream
633        CHECK_NE(PES_packet_length, 0u);
634        br->skipBits(PES_packet_length * 8);
635    } else {
636        CHECK_NE(PES_packet_length, 0u);
637        br->skipBits(PES_packet_length * 8);
638    }
639}
640
641void ATSParser::Stream::flush() {
642    if (mBuffer->size() == 0) {
643        return;
644    }
645
646    LOGV("flushing stream 0x%04x size = %d", mElementaryPID, mBuffer->size());
647
648    ABitReader br(mBuffer->data(), mBuffer->size());
649    parsePES(&br);
650
651    mBuffer->setRange(0, 0);
652}
653
654void ATSParser::Stream::onPayloadData(
655        unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS,
656        const uint8_t *data, size_t size) {
657    LOGV("onPayloadData mStreamType=0x%02x", mStreamType);
658
659    if (mQueue == NULL) {
660        return;
661    }
662
663    CHECK(PTS_DTS_flags == 2 || PTS_DTS_flags == 3);
664    int64_t timeUs = mProgram->convertPTSToTimestamp(PTS);
665
666    status_t err = mQueue->appendData(data, size, timeUs);
667
668    if (err != OK) {
669        return;
670    }
671
672    sp<ABuffer> accessUnit;
673    while ((accessUnit = mQueue->dequeueAccessUnit()) != NULL) {
674        if (mSource == NULL) {
675            sp<MetaData> meta = mQueue->getFormat();
676
677            if (meta != NULL) {
678                LOGV("Stream PID 0x%08x of type 0x%02x now has data.",
679                     mElementaryPID, mStreamType);
680
681                mSource = new AnotherPacketSource(meta);
682
683                if (mPendingDiscontinuity != DISCONTINUITY_NONE) {
684                    mSource->queueDiscontinuity(
685                            mPendingDiscontinuity, mPendingDiscontinuityExtra);
686                    mPendingDiscontinuity = DISCONTINUITY_NONE;
687                    mPendingDiscontinuityExtra.clear();
688                }
689
690                mSource->queueAccessUnit(accessUnit);
691            }
692        } else if (mQueue->getFormat() != NULL) {
693            // After a discontinuity we invalidate the queue's format
694            // and won't enqueue any access units to the source until
695            // the queue has reestablished the new format.
696
697            if (mSource->getFormat() == NULL) {
698                mSource->setFormat(mQueue->getFormat());
699            }
700            mSource->queueAccessUnit(accessUnit);
701        }
702    }
703}
704
705sp<MediaSource> ATSParser::Stream::getSource(SourceType type) {
706    switch (type) {
707        case VIDEO:
708        {
709            if (mStreamType == STREAMTYPE_H264
710                    || mStreamType == STREAMTYPE_MPEG1_VIDEO
711                    || mStreamType == STREAMTYPE_MPEG2_VIDEO
712                    || mStreamType == STREAMTYPE_MPEG4_VIDEO) {
713                return mSource;
714            }
715            break;
716        }
717
718        case AUDIO:
719        {
720            if (mStreamType == STREAMTYPE_MPEG1_AUDIO
721                    || mStreamType == STREAMTYPE_MPEG2_AUDIO
722                    || mStreamType == STREAMTYPE_MPEG2_AUDIO_ATDS) {
723                return mSource;
724            }
725            break;
726        }
727
728        default:
729            break;
730    }
731
732    return NULL;
733}
734
735////////////////////////////////////////////////////////////////////////////////
736
737ATSParser::ATSParser() {
738}
739
740ATSParser::~ATSParser() {
741}
742
743void ATSParser::feedTSPacket(const void *data, size_t size) {
744    CHECK_EQ(size, kTSPacketSize);
745
746    ABitReader br((const uint8_t *)data, kTSPacketSize);
747    parseTS(&br);
748}
749
750void ATSParser::signalDiscontinuity(
751        DiscontinuityType type, const sp<AMessage> &extra) {
752    for (size_t i = 0; i < mPrograms.size(); ++i) {
753        mPrograms.editItemAt(i)->signalDiscontinuity(type, extra);
754    }
755}
756
757void ATSParser::signalEOS(status_t finalResult) {
758    CHECK_NE(finalResult, (status_t)OK);
759
760    for (size_t i = 0; i < mPrograms.size(); ++i) {
761        mPrograms.editItemAt(i)->signalEOS(finalResult);
762    }
763}
764
765void ATSParser::parseProgramAssociationTable(ABitReader *br) {
766    unsigned table_id = br->getBits(8);
767    LOGV("  table_id = %u", table_id);
768    CHECK_EQ(table_id, 0x00u);
769
770    unsigned section_syntax_indictor = br->getBits(1);
771    LOGV("  section_syntax_indictor = %u", section_syntax_indictor);
772    CHECK_EQ(section_syntax_indictor, 1u);
773
774    CHECK_EQ(br->getBits(1), 0u);
775    MY_LOGV("  reserved = %u", br->getBits(2));
776
777    unsigned section_length = br->getBits(12);
778    LOGV("  section_length = %u", section_length);
779    CHECK_EQ(section_length & 0xc00, 0u);
780
781    MY_LOGV("  transport_stream_id = %u", br->getBits(16));
782    MY_LOGV("  reserved = %u", br->getBits(2));
783    MY_LOGV("  version_number = %u", br->getBits(5));
784    MY_LOGV("  current_next_indicator = %u", br->getBits(1));
785    MY_LOGV("  section_number = %u", br->getBits(8));
786    MY_LOGV("  last_section_number = %u", br->getBits(8));
787
788    size_t numProgramBytes = (section_length - 5 /* header */ - 4 /* crc */);
789    CHECK_EQ((numProgramBytes % 4), 0u);
790
791    for (size_t i = 0; i < numProgramBytes / 4; ++i) {
792        unsigned program_number = br->getBits(16);
793        LOGV("    program_number = %u", program_number);
794
795        MY_LOGV("    reserved = %u", br->getBits(3));
796
797        if (program_number == 0) {
798            MY_LOGV("    network_PID = 0x%04x", br->getBits(13));
799        } else {
800            unsigned programMapPID = br->getBits(13);
801
802            LOGV("    program_map_PID = 0x%04x", programMapPID);
803
804            bool found = false;
805            for (size_t index = 0; index < mPrograms.size(); ++index) {
806                const sp<Program> &program = mPrograms.itemAt(index);
807
808                if (program->number() == program_number) {
809                    program->updateProgramMapPID(programMapPID);
810                    found = true;
811                    break;
812                }
813            }
814
815            if (!found) {
816                mPrograms.push(
817                        new Program(this, program_number, programMapPID));
818            }
819        }
820    }
821
822    MY_LOGV("  CRC = 0x%08x", br->getBits(32));
823}
824
825void ATSParser::parsePID(
826        ABitReader *br, unsigned PID,
827        unsigned payload_unit_start_indicator) {
828    if (PID == 0) {
829        if (payload_unit_start_indicator) {
830            unsigned skip = br->getBits(8);
831            br->skipBits(skip * 8);
832        }
833        parseProgramAssociationTable(br);
834        return;
835    }
836
837    bool handled = false;
838    for (size_t i = 0; i < mPrograms.size(); ++i) {
839        if (mPrograms.editItemAt(i)->parsePID(
840                    PID, payload_unit_start_indicator, br)) {
841            handled = true;
842            break;
843        }
844    }
845
846    if (!handled) {
847        LOGV("PID 0x%04x not handled.", PID);
848    }
849}
850
851void ATSParser::parseAdaptationField(ABitReader *br) {
852    unsigned adaptation_field_length = br->getBits(8);
853    if (adaptation_field_length > 0) {
854        br->skipBits(adaptation_field_length * 8);  // XXX
855    }
856}
857
858void ATSParser::parseTS(ABitReader *br) {
859    LOGV("---");
860
861    unsigned sync_byte = br->getBits(8);
862    CHECK_EQ(sync_byte, 0x47u);
863
864    MY_LOGV("transport_error_indicator = %u", br->getBits(1));
865
866    unsigned payload_unit_start_indicator = br->getBits(1);
867    LOGV("payload_unit_start_indicator = %u", payload_unit_start_indicator);
868
869    MY_LOGV("transport_priority = %u", br->getBits(1));
870
871    unsigned PID = br->getBits(13);
872    LOGV("PID = 0x%04x", PID);
873
874    MY_LOGV("transport_scrambling_control = %u", br->getBits(2));
875
876    unsigned adaptation_field_control = br->getBits(2);
877    LOGV("adaptation_field_control = %u", adaptation_field_control);
878
879    unsigned continuity_counter = br->getBits(4);
880    LOGV("continuity_counter = %u", continuity_counter);
881
882    // LOGI("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter);
883
884    if (adaptation_field_control == 2 || adaptation_field_control == 3) {
885        parseAdaptationField(br);
886    }
887
888    if (adaptation_field_control == 1 || adaptation_field_control == 3) {
889        parsePID(br, PID, payload_unit_start_indicator);
890    }
891}
892
893sp<MediaSource> ATSParser::getSource(SourceType type) {
894    int which = -1;  // any
895
896    for (size_t i = 0; i < mPrograms.size(); ++i) {
897        const sp<Program> &program = mPrograms.editItemAt(i);
898
899        if (which >= 0 && (int)program->number() != which) {
900            continue;
901        }
902
903        sp<MediaSource> source = program->getSource(type);
904
905        if (source != NULL) {
906            return source;
907        }
908    }
909
910    return NULL;
911}
912
913bool ATSParser::PTSTimeDeltaEstablished() {
914    if (mPrograms.isEmpty()) {
915        return false;
916    }
917
918    return mPrograms.editItemAt(0)->PTSTimeDeltaEstablished();
919}
920
921}  // namespace android
922