ATSParser.cpp revision 9bf32f06e8971c1d3eb4fc5edd74b69557f97212 
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/stagefright/Utils.h>
36#include <media/IStreamSource.h>
37#include <utils/KeyedVector.h>
38
39#include <inttypes.h>
40
41namespace android {
42
43// I want the expression "y" evaluated even if verbose logging is off.
44#define MY_LOGV(x, y) \
45    do { unsigned tmp = y; ALOGV(x, tmp); } while (0)
46
47static const size_t kTSPacketSize = 188;
48
49struct ATSParser::Program : public RefBase {
50    Program(ATSParser *parser, unsigned programNumber, unsigned programMapPID);
51
52    bool parsePSISection(
53            unsigned pid, ABitReader *br, status_t *err);
54
55    bool parsePID(
56            unsigned pid, unsigned continuity_counter,
57            unsigned payload_unit_start_indicator,
58            ABitReader *br, status_t *err);
59
60    void signalDiscontinuity(
61            DiscontinuityType type, const sp<AMessage> &extra);
62
63    void signalEOS(status_t finalResult);
64
65    sp<MediaSource> getSource(SourceType type);
66
67    int64_t convertPTSToTimestamp(uint64_t PTS);
68
69    bool PTSTimeDeltaEstablished() const {
70        return mFirstPTSValid;
71    }
72
73    unsigned number() const { return mProgramNumber; }
74
75    void updateProgramMapPID(unsigned programMapPID) {
76        mProgramMapPID = programMapPID;
77    }
78
79    unsigned programMapPID() const {
80        return mProgramMapPID;
81    }
82
83    uint32_t parserFlags() const {
84        return mParser->mFlags;
85    }
86
87private:
88    ATSParser *mParser;
89    unsigned mProgramNumber;
90    unsigned mProgramMapPID;
91    KeyedVector<unsigned, sp<Stream> > mStreams;
92    bool mFirstPTSValid;
93    uint64_t mFirstPTS;
94
95    status_t parseProgramMap(ABitReader *br);
96
97    DISALLOW_EVIL_CONSTRUCTORS(Program);
98};
99
100struct ATSParser::Stream : public RefBase {
101    Stream(Program *program,
102           unsigned elementaryPID,
103           unsigned streamType,
104           unsigned PCR_PID);
105
106    unsigned type() const { return mStreamType; }
107    unsigned pid() const { return mElementaryPID; }
108    void setPID(unsigned pid) { mElementaryPID = pid; }
109
110    status_t parse(
111            unsigned continuity_counter,
112            unsigned payload_unit_start_indicator,
113            ABitReader *br);
114
115    void signalDiscontinuity(
116            DiscontinuityType type, const sp<AMessage> &extra);
117
118    void signalEOS(status_t finalResult);
119
120    sp<MediaSource> getSource(SourceType type);
121
122protected:
123    virtual ~Stream();
124
125private:
126    Program *mProgram;
127    unsigned mElementaryPID;
128    unsigned mStreamType;
129    unsigned mPCR_PID;
130    int32_t mExpectedContinuityCounter;
131
132    sp<ABuffer> mBuffer;
133    sp<AnotherPacketSource> mSource;
134    bool mPayloadStarted;
135
136    uint64_t mPrevPTS;
137
138    ElementaryStreamQueue *mQueue;
139
140    status_t flush();
141    status_t parsePES(ABitReader *br);
142
143    void onPayloadData(
144            unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS,
145            const uint8_t *data, size_t size);
146
147    void extractAACFrames(const sp<ABuffer> &buffer);
148
149    bool isAudio() const;
150    bool isVideo() const;
151
152    DISALLOW_EVIL_CONSTRUCTORS(Stream);
153};
154
155struct ATSParser::PSISection : public RefBase {
156    PSISection();
157
158    status_t append(const void *data, size_t size);
159    void clear();
160
161    bool isComplete() const;
162    bool isEmpty() const;
163
164    const uint8_t *data() const;
165    size_t size() const;
166
167protected:
168    virtual ~PSISection();
169
170private:
171    sp<ABuffer> mBuffer;
172
173    DISALLOW_EVIL_CONSTRUCTORS(PSISection);
174};
175
176////////////////////////////////////////////////////////////////////////////////
177
178ATSParser::Program::Program(
179        ATSParser *parser, unsigned programNumber, unsigned programMapPID)
180    : mParser(parser),
181      mProgramNumber(programNumber),
182      mProgramMapPID(programMapPID),
183      mFirstPTSValid(false),
184      mFirstPTS(0) {
185    ALOGV("new program number %u", programNumber);
186}
187
188bool ATSParser::Program::parsePSISection(
189        unsigned pid, ABitReader *br, status_t *err) {
190    *err = OK;
191
192    if (pid != mProgramMapPID) {
193        return false;
194    }
195
196    *err = parseProgramMap(br);
197
198    return true;
199}
200
201bool ATSParser::Program::parsePID(
202        unsigned pid, unsigned continuity_counter,
203        unsigned payload_unit_start_indicator,
204        ABitReader *br, status_t *err) {
205    *err = OK;
206
207    ssize_t index = mStreams.indexOfKey(pid);
208    if (index < 0) {
209        return false;
210    }
211
212    *err = mStreams.editValueAt(index)->parse(
213            continuity_counter, payload_unit_start_indicator, br);
214
215    return true;
216}
217
218void ATSParser::Program::signalDiscontinuity(
219        DiscontinuityType type, const sp<AMessage> &extra) {
220    int64_t mediaTimeUs;
221    if ((type & DISCONTINUITY_TIME)
222            && extra != NULL
223            && extra->findInt64(
224                IStreamListener::kKeyMediaTimeUs, &mediaTimeUs)) {
225        mFirstPTSValid = false;
226    }
227
228    for (size_t i = 0; i < mStreams.size(); ++i) {
229        mStreams.editValueAt(i)->signalDiscontinuity(type, extra);
230    }
231}
232
233void ATSParser::Program::signalEOS(status_t finalResult) {
234    for (size_t i = 0; i < mStreams.size(); ++i) {
235        mStreams.editValueAt(i)->signalEOS(finalResult);
236    }
237}
238
239struct StreamInfo {
240    unsigned mType;
241    unsigned mPID;
242};
243
244status_t ATSParser::Program::parseProgramMap(ABitReader *br) {
245    unsigned table_id = br->getBits(8);
246    ALOGV("  table_id = %u", table_id);
247    CHECK_EQ(table_id, 0x02u);
248
249    unsigned section_syntax_indicator = br->getBits(1);
250    ALOGV("  section_syntax_indicator = %u", section_syntax_indicator);
251    CHECK_EQ(section_syntax_indicator, 1u);
252
253    CHECK_EQ(br->getBits(1), 0u);
254    MY_LOGV("  reserved = %u", br->getBits(2));
255
256    unsigned section_length = br->getBits(12);
257    ALOGV("  section_length = %u", section_length);
258    CHECK_EQ(section_length & 0xc00, 0u);
259    CHECK_LE(section_length, 1021u);
260
261    MY_LOGV("  program_number = %u", br->getBits(16));
262    MY_LOGV("  reserved = %u", br->getBits(2));
263    MY_LOGV("  version_number = %u", br->getBits(5));
264    MY_LOGV("  current_next_indicator = %u", br->getBits(1));
265    MY_LOGV("  section_number = %u", br->getBits(8));
266    MY_LOGV("  last_section_number = %u", br->getBits(8));
267    MY_LOGV("  reserved = %u", br->getBits(3));
268
269    unsigned PCR_PID = br->getBits(13);
270    ALOGV("  PCR_PID = 0x%04x", PCR_PID);
271
272    MY_LOGV("  reserved = %u", br->getBits(4));
273
274    unsigned program_info_length = br->getBits(12);
275    ALOGV("  program_info_length = %u", program_info_length);
276    CHECK_EQ(program_info_length & 0xc00, 0u);
277
278    br->skipBits(program_info_length * 8);  // skip descriptors
279
280    Vector<StreamInfo> infos;
281
282    // infoBytesRemaining is the number of bytes that make up the
283    // variable length section of ES_infos. It does not include the
284    // final CRC.
285    size_t infoBytesRemaining = section_length - 9 - program_info_length - 4;
286
287    while (infoBytesRemaining > 0) {
288        CHECK_GE(infoBytesRemaining, 5u);
289
290        unsigned streamType = br->getBits(8);
291        ALOGV("    stream_type = 0x%02x", streamType);
292
293        MY_LOGV("    reserved = %u", br->getBits(3));
294
295        unsigned elementaryPID = br->getBits(13);
296        ALOGV("    elementary_PID = 0x%04x", elementaryPID);
297
298        MY_LOGV("    reserved = %u", br->getBits(4));
299
300        unsigned ES_info_length = br->getBits(12);
301        ALOGV("    ES_info_length = %u", ES_info_length);
302        CHECK_EQ(ES_info_length & 0xc00, 0u);
303
304        CHECK_GE(infoBytesRemaining - 5, ES_info_length);
305
306#if 0
307        br->skipBits(ES_info_length * 8);  // skip descriptors
308#else
309        unsigned info_bytes_remaining = ES_info_length;
310        while (info_bytes_remaining >= 2) {
311            MY_LOGV("      tag = 0x%02x", br->getBits(8));
312
313            unsigned descLength = br->getBits(8);
314            ALOGV("      len = %u", descLength);
315
316            CHECK_GE(info_bytes_remaining, 2 + descLength);
317
318            br->skipBits(descLength * 8);
319
320            info_bytes_remaining -= descLength + 2;
321        }
322        CHECK_EQ(info_bytes_remaining, 0u);
323#endif
324
325        StreamInfo info;
326        info.mType = streamType;
327        info.mPID = elementaryPID;
328        infos.push(info);
329
330        infoBytesRemaining -= 5 + ES_info_length;
331    }
332
333    CHECK_EQ(infoBytesRemaining, 0u);
334    MY_LOGV("  CRC = 0x%08x", br->getBits(32));
335
336    bool PIDsChanged = false;
337    for (size_t i = 0; i < infos.size(); ++i) {
338        StreamInfo &info = infos.editItemAt(i);
339
340        ssize_t index = mStreams.indexOfKey(info.mPID);
341
342        if (index >= 0 && mStreams.editValueAt(index)->type() != info.mType) {
343            ALOGI("uh oh. stream PIDs have changed.");
344            PIDsChanged = true;
345            break;
346        }
347    }
348
349    if (PIDsChanged) {
350#if 0
351        ALOGI("before:");
352        for (size_t i = 0; i < mStreams.size(); ++i) {
353            sp<Stream> stream = mStreams.editValueAt(i);
354
355            ALOGI("PID 0x%08x => type 0x%02x", stream->pid(), stream->type());
356        }
357
358        ALOGI("after:");
359        for (size_t i = 0; i < infos.size(); ++i) {
360            StreamInfo &info = infos.editItemAt(i);
361
362            ALOGI("PID 0x%08x => type 0x%02x", info.mPID, info.mType);
363        }
364#endif
365
366        // The only case we can recover from is if we have two streams
367        // and they switched PIDs.
368
369        bool success = false;
370
371        if (mStreams.size() == 2 && infos.size() == 2) {
372            const StreamInfo &info1 = infos.itemAt(0);
373            const StreamInfo &info2 = infos.itemAt(1);
374
375            sp<Stream> s1 = mStreams.editValueAt(0);
376            sp<Stream> s2 = mStreams.editValueAt(1);
377
378            bool caseA =
379                info1.mPID == s1->pid() && info1.mType == s2->type()
380                    && info2.mPID == s2->pid() && info2.mType == s1->type();
381
382            bool caseB =
383                info1.mPID == s2->pid() && info1.mType == s1->type()
384                    && info2.mPID == s1->pid() && info2.mType == s2->type();
385
386            if (caseA || caseB) {
387                unsigned pid1 = s1->pid();
388                unsigned pid2 = s2->pid();
389                s1->setPID(pid2);
390                s2->setPID(pid1);
391
392                mStreams.clear();
393                mStreams.add(s1->pid(), s1);
394                mStreams.add(s2->pid(), s2);
395
396                success = true;
397            }
398        }
399
400        if (!success) {
401            ALOGI("Stream PIDs changed and we cannot recover.");
402            return ERROR_MALFORMED;
403        }
404    }
405
406    for (size_t i = 0; i < infos.size(); ++i) {
407        StreamInfo &info = infos.editItemAt(i);
408
409        ssize_t index = mStreams.indexOfKey(info.mPID);
410
411        if (index < 0) {
412            sp<Stream> stream = new Stream(
413                    this, info.mPID, info.mType, PCR_PID);
414
415            mStreams.add(info.mPID, stream);
416        }
417    }
418
419    return OK;
420}
421
422sp<MediaSource> ATSParser::Program::getSource(SourceType type) {
423    size_t index = (type == AUDIO) ? 0 : 0;
424
425    for (size_t i = 0; i < mStreams.size(); ++i) {
426        sp<MediaSource> source = mStreams.editValueAt(i)->getSource(type);
427        if (source != NULL) {
428            if (index == 0) {
429                return source;
430            }
431            --index;
432        }
433    }
434
435    return NULL;
436}
437
438int64_t ATSParser::Program::convertPTSToTimestamp(uint64_t PTS) {
439    if (!(mParser->mFlags & TS_TIMESTAMPS_ARE_ABSOLUTE)) {
440        if (!mFirstPTSValid) {
441            mFirstPTSValid = true;
442            mFirstPTS = PTS;
443            PTS = 0;
444        } else if (PTS < mFirstPTS) {
445            PTS = 0;
446        } else {
447            PTS -= mFirstPTS;
448        }
449    }
450
451    int64_t timeUs = (PTS * 100) / 9;
452
453    if (mParser->mAbsoluteTimeAnchorUs >= 0ll) {
454        timeUs += mParser->mAbsoluteTimeAnchorUs;
455    }
456
457    if (mParser->mTimeOffsetValid) {
458        timeUs += mParser->mTimeOffsetUs;
459    }
460
461    return timeUs;
462}
463
464////////////////////////////////////////////////////////////////////////////////
465
466ATSParser::Stream::Stream(
467        Program *program,
468        unsigned elementaryPID,
469        unsigned streamType,
470        unsigned PCR_PID)
471    : mProgram(program),
472      mElementaryPID(elementaryPID),
473      mStreamType(streamType),
474      mPCR_PID(PCR_PID),
475      mExpectedContinuityCounter(-1),
476      mPayloadStarted(false),
477      mPrevPTS(0),
478      mQueue(NULL) {
479    switch (mStreamType) {
480        case STREAMTYPE_H264:
481            mQueue = new ElementaryStreamQueue(
482                    ElementaryStreamQueue::H264,
483                    (mProgram->parserFlags() & ALIGNED_VIDEO_DATA)
484                        ? ElementaryStreamQueue::kFlag_AlignedData : 0);
485            break;
486        case STREAMTYPE_MPEG2_AUDIO_ADTS:
487            mQueue = new ElementaryStreamQueue(ElementaryStreamQueue::AAC);
488            break;
489        case STREAMTYPE_MPEG1_AUDIO:
490        case STREAMTYPE_MPEG2_AUDIO:
491            mQueue = new ElementaryStreamQueue(
492                    ElementaryStreamQueue::MPEG_AUDIO);
493            break;
494
495        case STREAMTYPE_MPEG1_VIDEO:
496        case STREAMTYPE_MPEG2_VIDEO:
497            mQueue = new ElementaryStreamQueue(
498                    ElementaryStreamQueue::MPEG_VIDEO);
499            break;
500
501        case STREAMTYPE_MPEG4_VIDEO:
502            mQueue = new ElementaryStreamQueue(
503                    ElementaryStreamQueue::MPEG4_VIDEO);
504            break;
505
506        case STREAMTYPE_LPCM_AC3:
507        case STREAMTYPE_AC3:
508            mQueue = new ElementaryStreamQueue(
509                    ElementaryStreamQueue::AC3);
510            break;
511
512        default:
513            break;
514    }
515
516    ALOGV("new stream PID 0x%02x, type 0x%02x", elementaryPID, streamType);
517
518    if (mQueue != NULL) {
519        mBuffer = new ABuffer(192 * 1024);
520        mBuffer->setRange(0, 0);
521    }
522}
523
524ATSParser::Stream::~Stream() {
525    delete mQueue;
526    mQueue = NULL;
527}
528
529status_t ATSParser::Stream::parse(
530        unsigned continuity_counter,
531        unsigned payload_unit_start_indicator, ABitReader *br) {
532    if (mQueue == NULL) {
533        return OK;
534    }
535
536    if (mExpectedContinuityCounter >= 0
537            && (unsigned)mExpectedContinuityCounter != continuity_counter) {
538        ALOGI("discontinuity on stream pid 0x%04x", mElementaryPID);
539
540        mPayloadStarted = false;
541        mBuffer->setRange(0, 0);
542        mExpectedContinuityCounter = -1;
543
544#if 0
545        // Uncomment this if you'd rather see no corruption whatsoever on
546        // screen and suspend updates until we come across another IDR frame.
547
548        if (mStreamType == STREAMTYPE_H264) {
549            ALOGI("clearing video queue");
550            mQueue->clear(true /* clearFormat */);
551        }
552#endif
553
554        if (!payload_unit_start_indicator) {
555            return OK;
556        }
557    }
558
559    mExpectedContinuityCounter = (continuity_counter + 1) & 0x0f;
560
561    if (payload_unit_start_indicator) {
562        if (mPayloadStarted) {
563            // Otherwise we run the danger of receiving the trailing bytes
564            // of a PES packet that we never saw the start of and assuming
565            // we have a a complete PES packet.
566
567            status_t err = flush();
568
569            if (err != OK) {
570                return err;
571            }
572        }
573
574        mPayloadStarted = true;
575    }
576
577    if (!mPayloadStarted) {
578        return OK;
579    }
580
581    size_t payloadSizeBits = br->numBitsLeft();
582    CHECK_EQ(payloadSizeBits % 8, 0u);
583
584    size_t neededSize = mBuffer->size() + payloadSizeBits / 8;
585    if (mBuffer->capacity() < neededSize) {
586        // Increment in multiples of 64K.
587        neededSize = (neededSize + 65535) & ~65535;
588
589        ALOGI("resizing buffer to %zu bytes", neededSize);
590
591        sp<ABuffer> newBuffer = new ABuffer(neededSize);
592        memcpy(newBuffer->data(), mBuffer->data(), mBuffer->size());
593        newBuffer->setRange(0, mBuffer->size());
594        mBuffer = newBuffer;
595    }
596
597    memcpy(mBuffer->data() + mBuffer->size(), br->data(), payloadSizeBits / 8);
598    mBuffer->setRange(0, mBuffer->size() + payloadSizeBits / 8);
599
600    return OK;
601}
602
603bool ATSParser::Stream::isVideo() const {
604    switch (mStreamType) {
605        case STREAMTYPE_H264:
606        case STREAMTYPE_MPEG1_VIDEO:
607        case STREAMTYPE_MPEG2_VIDEO:
608        case STREAMTYPE_MPEG4_VIDEO:
609            return true;
610
611        default:
612            return false;
613    }
614}
615
616bool ATSParser::Stream::isAudio() const {
617    switch (mStreamType) {
618        case STREAMTYPE_MPEG1_AUDIO:
619        case STREAMTYPE_MPEG2_AUDIO:
620        case STREAMTYPE_MPEG2_AUDIO_ADTS:
621        case STREAMTYPE_LPCM_AC3:
622        case STREAMTYPE_AC3:
623            return true;
624
625        default:
626            return false;
627    }
628}
629
630void ATSParser::Stream::signalDiscontinuity(
631        DiscontinuityType type, const sp<AMessage> &extra) {
632    mExpectedContinuityCounter = -1;
633
634    if (mQueue == NULL) {
635        return;
636    }
637
638    mPayloadStarted = false;
639    mBuffer->setRange(0, 0);
640
641    bool clearFormat = false;
642    if (isAudio()) {
643        if (type & DISCONTINUITY_AUDIO_FORMAT) {
644            clearFormat = true;
645        }
646    } else {
647        if (type & DISCONTINUITY_VIDEO_FORMAT) {
648            clearFormat = true;
649        }
650    }
651
652    mQueue->clear(clearFormat);
653
654    if (type & DISCONTINUITY_TIME) {
655        uint64_t resumeAtPTS;
656        if (extra != NULL
657                && extra->findInt64(
658                    IStreamListener::kKeyResumeAtPTS,
659                    (int64_t *)&resumeAtPTS)) {
660            int64_t resumeAtMediaTimeUs =
661                mProgram->convertPTSToTimestamp(resumeAtPTS);
662
663            extra->setInt64("resume-at-mediatimeUs", resumeAtMediaTimeUs);
664        }
665    }
666
667    if (mSource != NULL) {
668        mSource->queueDiscontinuity(type, extra, true);
669    }
670}
671
672void ATSParser::Stream::signalEOS(status_t finalResult) {
673    if (mSource != NULL) {
674        mSource->signalEOS(finalResult);
675    }
676}
677
678status_t ATSParser::Stream::parsePES(ABitReader *br) {
679    unsigned packet_startcode_prefix = br->getBits(24);
680
681    ALOGV("packet_startcode_prefix = 0x%08x", packet_startcode_prefix);
682
683    if (packet_startcode_prefix != 1) {
684        ALOGV("Supposedly payload_unit_start=1 unit does not start "
685             "with startcode.");
686
687        return ERROR_MALFORMED;
688    }
689
690    CHECK_EQ(packet_startcode_prefix, 0x000001u);
691
692    unsigned stream_id = br->getBits(8);
693    ALOGV("stream_id = 0x%02x", stream_id);
694
695    unsigned PES_packet_length = br->getBits(16);
696    ALOGV("PES_packet_length = %u", PES_packet_length);
697
698    if (stream_id != 0xbc  // program_stream_map
699            && stream_id != 0xbe  // padding_stream
700            && stream_id != 0xbf  // private_stream_2
701            && stream_id != 0xf0  // ECM
702            && stream_id != 0xf1  // EMM
703            && stream_id != 0xff  // program_stream_directory
704            && stream_id != 0xf2  // DSMCC
705            && stream_id != 0xf8) {  // H.222.1 type E
706        CHECK_EQ(br->getBits(2), 2u);
707
708        MY_LOGV("PES_scrambling_control = %u", br->getBits(2));
709        MY_LOGV("PES_priority = %u", br->getBits(1));
710        MY_LOGV("data_alignment_indicator = %u", br->getBits(1));
711        MY_LOGV("copyright = %u", br->getBits(1));
712        MY_LOGV("original_or_copy = %u", br->getBits(1));
713
714        unsigned PTS_DTS_flags = br->getBits(2);
715        ALOGV("PTS_DTS_flags = %u", PTS_DTS_flags);
716
717        unsigned ESCR_flag = br->getBits(1);
718        ALOGV("ESCR_flag = %u", ESCR_flag);
719
720        unsigned ES_rate_flag = br->getBits(1);
721        ALOGV("ES_rate_flag = %u", ES_rate_flag);
722
723        unsigned DSM_trick_mode_flag = br->getBits(1);
724        ALOGV("DSM_trick_mode_flag = %u", DSM_trick_mode_flag);
725
726        unsigned additional_copy_info_flag = br->getBits(1);
727        ALOGV("additional_copy_info_flag = %u", additional_copy_info_flag);
728
729        MY_LOGV("PES_CRC_flag = %u", br->getBits(1));
730        MY_LOGV("PES_extension_flag = %u", br->getBits(1));
731
732        unsigned PES_header_data_length = br->getBits(8);
733        ALOGV("PES_header_data_length = %u", PES_header_data_length);
734
735        unsigned optional_bytes_remaining = PES_header_data_length;
736
737        uint64_t PTS = 0, DTS = 0;
738
739        if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) {
740            CHECK_GE(optional_bytes_remaining, 5u);
741
742            CHECK_EQ(br->getBits(4), PTS_DTS_flags);
743
744            PTS = ((uint64_t)br->getBits(3)) << 30;
745            CHECK_EQ(br->getBits(1), 1u);
746            PTS |= ((uint64_t)br->getBits(15)) << 15;
747            CHECK_EQ(br->getBits(1), 1u);
748            PTS |= br->getBits(15);
749            CHECK_EQ(br->getBits(1), 1u);
750
751            ALOGV("PTS = 0x%016" PRIx64 " (%.2f)", PTS, PTS / 90000.0);
752
753            optional_bytes_remaining -= 5;
754
755            if (PTS_DTS_flags == 3) {
756                CHECK_GE(optional_bytes_remaining, 5u);
757
758                CHECK_EQ(br->getBits(4), 1u);
759
760                DTS = ((uint64_t)br->getBits(3)) << 30;
761                CHECK_EQ(br->getBits(1), 1u);
762                DTS |= ((uint64_t)br->getBits(15)) << 15;
763                CHECK_EQ(br->getBits(1), 1u);
764                DTS |= br->getBits(15);
765                CHECK_EQ(br->getBits(1), 1u);
766
767                ALOGV("DTS = %" PRIu64, DTS);
768
769                optional_bytes_remaining -= 5;
770            }
771        }
772
773        if (ESCR_flag) {
774            CHECK_GE(optional_bytes_remaining, 6u);
775
776            br->getBits(2);
777
778            uint64_t ESCR = ((uint64_t)br->getBits(3)) << 30;
779            CHECK_EQ(br->getBits(1), 1u);
780            ESCR |= ((uint64_t)br->getBits(15)) << 15;
781            CHECK_EQ(br->getBits(1), 1u);
782            ESCR |= br->getBits(15);
783            CHECK_EQ(br->getBits(1), 1u);
784
785            ALOGV("ESCR = %" PRIu64, ESCR);
786            MY_LOGV("ESCR_extension = %u", br->getBits(9));
787
788            CHECK_EQ(br->getBits(1), 1u);
789
790            optional_bytes_remaining -= 6;
791        }
792
793        if (ES_rate_flag) {
794            CHECK_GE(optional_bytes_remaining, 3u);
795
796            CHECK_EQ(br->getBits(1), 1u);
797            MY_LOGV("ES_rate = %u", br->getBits(22));
798            CHECK_EQ(br->getBits(1), 1u);
799
800            optional_bytes_remaining -= 3;
801        }
802
803        br->skipBits(optional_bytes_remaining * 8);
804
805        // ES data follows.
806
807        if (PES_packet_length != 0) {
808            CHECK_GE(PES_packet_length, PES_header_data_length + 3);
809
810            unsigned dataLength =
811                PES_packet_length - 3 - PES_header_data_length;
812
813            if (br->numBitsLeft() < dataLength * 8) {
814                ALOGE("PES packet does not carry enough data to contain "
815                     "payload. (numBitsLeft = %zu, required = %u)",
816                     br->numBitsLeft(), dataLength * 8);
817
818                return ERROR_MALFORMED;
819            }
820
821            CHECK_GE(br->numBitsLeft(), dataLength * 8);
822
823            onPayloadData(
824                    PTS_DTS_flags, PTS, DTS, br->data(), dataLength);
825
826            br->skipBits(dataLength * 8);
827        } else {
828            onPayloadData(
829                    PTS_DTS_flags, PTS, DTS,
830                    br->data(), br->numBitsLeft() / 8);
831
832            size_t payloadSizeBits = br->numBitsLeft();
833            CHECK_EQ(payloadSizeBits % 8, 0u);
834
835            ALOGV("There's %zu bytes of payload.", payloadSizeBits / 8);
836        }
837    } else if (stream_id == 0xbe) {  // padding_stream
838        CHECK_NE(PES_packet_length, 0u);
839        br->skipBits(PES_packet_length * 8);
840    } else {
841        CHECK_NE(PES_packet_length, 0u);
842        br->skipBits(PES_packet_length * 8);
843    }
844
845    return OK;
846}
847
848status_t ATSParser::Stream::flush() {
849    if (mBuffer->size() == 0) {
850        return OK;
851    }
852
853    ALOGV("flushing stream 0x%04x size = %zu", mElementaryPID, mBuffer->size());
854
855    ABitReader br(mBuffer->data(), mBuffer->size());
856
857    status_t err = parsePES(&br);
858
859    mBuffer->setRange(0, 0);
860
861    return err;
862}
863
864void ATSParser::Stream::onPayloadData(
865        unsigned PTS_DTS_flags, uint64_t PTS, uint64_t /* DTS */,
866        const uint8_t *data, size_t size) {
867#if 0
868    ALOGI("payload streamType 0x%02x, PTS = 0x%016llx, dPTS = %lld",
869          mStreamType,
870          PTS,
871          (int64_t)PTS - mPrevPTS);
872    mPrevPTS = PTS;
873#endif
874
875    ALOGV("onPayloadData mStreamType=0x%02x", mStreamType);
876
877    int64_t timeUs = 0ll;  // no presentation timestamp available.
878    if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) {
879        timeUs = mProgram->convertPTSToTimestamp(PTS);
880    }
881
882    status_t err = mQueue->appendData(data, size, timeUs);
883
884    if (err != OK) {
885        return;
886    }
887
888    sp<ABuffer> accessUnit;
889    while ((accessUnit = mQueue->dequeueAccessUnit()) != NULL) {
890        if (mSource == NULL) {
891            sp<MetaData> meta = mQueue->getFormat();
892
893            if (meta != NULL) {
894                ALOGV("Stream PID 0x%08x of type 0x%02x now has data.",
895                     mElementaryPID, mStreamType);
896
897                mSource = new AnotherPacketSource(meta);
898                mSource->queueAccessUnit(accessUnit);
899            }
900        } else if (mQueue->getFormat() != NULL) {
901            // After a discontinuity we invalidate the queue's format
902            // and won't enqueue any access units to the source until
903            // the queue has reestablished the new format.
904
905            if (mSource->getFormat() == NULL) {
906                mSource->setFormat(mQueue->getFormat());
907            }
908            mSource->queueAccessUnit(accessUnit);
909        }
910    }
911}
912
913sp<MediaSource> ATSParser::Stream::getSource(SourceType type) {
914    switch (type) {
915        case VIDEO:
916        {
917            if (isVideo()) {
918                return mSource;
919            }
920            break;
921        }
922
923        case AUDIO:
924        {
925            if (isAudio()) {
926                return mSource;
927            }
928            break;
929        }
930
931        default:
932            break;
933    }
934
935    return NULL;
936}
937
938////////////////////////////////////////////////////////////////////////////////
939
940ATSParser::ATSParser(uint32_t flags)
941    : mFlags(flags),
942      mAbsoluteTimeAnchorUs(-1ll),
943      mTimeOffsetValid(false),
944      mTimeOffsetUs(0ll),
945      mNumTSPacketsParsed(0),
946      mNumPCRs(0) {
947    mPSISections.add(0 /* PID */, new PSISection);
948}
949
950ATSParser::~ATSParser() {
951}
952
953status_t ATSParser::feedTSPacket(const void *data, size_t size) {
954    CHECK_EQ(size, kTSPacketSize);
955
956    ABitReader br((const uint8_t *)data, kTSPacketSize);
957    return parseTS(&br);
958}
959
960void ATSParser::signalDiscontinuity(
961        DiscontinuityType type, const sp<AMessage> &extra) {
962    int64_t mediaTimeUs;
963    if ((type & DISCONTINUITY_TIME)
964            && extra != NULL
965            && extra->findInt64(
966                IStreamListener::kKeyMediaTimeUs, &mediaTimeUs)) {
967        mAbsoluteTimeAnchorUs = mediaTimeUs;
968    } else if (type == DISCONTINUITY_ABSOLUTE_TIME) {
969        int64_t timeUs;
970        CHECK(extra->findInt64("timeUs", &timeUs));
971
972        CHECK(mPrograms.empty());
973        mAbsoluteTimeAnchorUs = timeUs;
974        return;
975    } else if (type == DISCONTINUITY_TIME_OFFSET) {
976        int64_t offset;
977        CHECK(extra->findInt64("offset", &offset));
978
979        mTimeOffsetValid = true;
980        mTimeOffsetUs = offset;
981        return;
982    }
983
984    for (size_t i = 0; i < mPrograms.size(); ++i) {
985        mPrograms.editItemAt(i)->signalDiscontinuity(type, extra);
986    }
987}
988
989void ATSParser::signalEOS(status_t finalResult) {
990    CHECK_NE(finalResult, (status_t)OK);
991
992    for (size_t i = 0; i < mPrograms.size(); ++i) {
993        mPrograms.editItemAt(i)->signalEOS(finalResult);
994    }
995}
996
997void ATSParser::parseProgramAssociationTable(ABitReader *br) {
998    unsigned table_id = br->getBits(8);
999    ALOGV("  table_id = %u", table_id);
1000    CHECK_EQ(table_id, 0x00u);
1001
1002    unsigned section_syntax_indictor = br->getBits(1);
1003    ALOGV("  section_syntax_indictor = %u", section_syntax_indictor);
1004    CHECK_EQ(section_syntax_indictor, 1u);
1005
1006    CHECK_EQ(br->getBits(1), 0u);
1007    MY_LOGV("  reserved = %u", br->getBits(2));
1008
1009    unsigned section_length = br->getBits(12);
1010    ALOGV("  section_length = %u", section_length);
1011    CHECK_EQ(section_length & 0xc00, 0u);
1012
1013    MY_LOGV("  transport_stream_id = %u", br->getBits(16));
1014    MY_LOGV("  reserved = %u", br->getBits(2));
1015    MY_LOGV("  version_number = %u", br->getBits(5));
1016    MY_LOGV("  current_next_indicator = %u", br->getBits(1));
1017    MY_LOGV("  section_number = %u", br->getBits(8));
1018    MY_LOGV("  last_section_number = %u", br->getBits(8));
1019
1020    size_t numProgramBytes = (section_length - 5 /* header */ - 4 /* crc */);
1021    CHECK_EQ((numProgramBytes % 4), 0u);
1022
1023    for (size_t i = 0; i < numProgramBytes / 4; ++i) {
1024        unsigned program_number = br->getBits(16);
1025        ALOGV("    program_number = %u", program_number);
1026
1027        MY_LOGV("    reserved = %u", br->getBits(3));
1028
1029        if (program_number == 0) {
1030            MY_LOGV("    network_PID = 0x%04x", br->getBits(13));
1031        } else {
1032            unsigned programMapPID = br->getBits(13);
1033
1034            ALOGV("    program_map_PID = 0x%04x", programMapPID);
1035
1036            bool found = false;
1037            for (size_t index = 0; index < mPrograms.size(); ++index) {
1038                const sp<Program> &program = mPrograms.itemAt(index);
1039
1040                if (program->number() == program_number) {
1041                    program->updateProgramMapPID(programMapPID);
1042                    found = true;
1043                    break;
1044                }
1045            }
1046
1047            if (!found) {
1048                mPrograms.push(
1049                        new Program(this, program_number, programMapPID));
1050            }
1051
1052            if (mPSISections.indexOfKey(programMapPID) < 0) {
1053                mPSISections.add(programMapPID, new PSISection);
1054            }
1055        }
1056    }
1057
1058    MY_LOGV("  CRC = 0x%08x", br->getBits(32));
1059}
1060
1061status_t ATSParser::parsePID(
1062        ABitReader *br, unsigned PID,
1063        unsigned continuity_counter,
1064        unsigned payload_unit_start_indicator) {
1065    ssize_t sectionIndex = mPSISections.indexOfKey(PID);
1066
1067    if (sectionIndex >= 0) {
1068        sp<PSISection> section = mPSISections.valueAt(sectionIndex);
1069
1070        if (payload_unit_start_indicator) {
1071            CHECK(section->isEmpty());
1072
1073            unsigned skip = br->getBits(8);
1074            br->skipBits(skip * 8);
1075        }
1076
1077        CHECK((br->numBitsLeft() % 8) == 0);
1078        status_t err = section->append(br->data(), br->numBitsLeft() / 8);
1079
1080        if (err != OK) {
1081            return err;
1082        }
1083
1084        if (!section->isComplete()) {
1085            return OK;
1086        }
1087
1088        ABitReader sectionBits(section->data(), section->size());
1089
1090        if (PID == 0) {
1091            parseProgramAssociationTable(&sectionBits);
1092        } else {
1093            bool handled = false;
1094            for (size_t i = 0; i < mPrograms.size(); ++i) {
1095                status_t err;
1096                if (!mPrograms.editItemAt(i)->parsePSISection(
1097                            PID, &sectionBits, &err)) {
1098                    continue;
1099                }
1100
1101                if (err != OK) {
1102                    return err;
1103                }
1104
1105                handled = true;
1106                break;
1107            }
1108
1109            if (!handled) {
1110                mPSISections.removeItem(PID);
1111                section.clear();
1112            }
1113        }
1114
1115        if (section != NULL) {
1116            section->clear();
1117        }
1118
1119        return OK;
1120    }
1121
1122    bool handled = false;
1123    for (size_t i = 0; i < mPrograms.size(); ++i) {
1124        status_t err;
1125        if (mPrograms.editItemAt(i)->parsePID(
1126                    PID, continuity_counter, payload_unit_start_indicator,
1127                    br, &err)) {
1128            if (err != OK) {
1129                return err;
1130            }
1131
1132            handled = true;
1133            break;
1134        }
1135    }
1136
1137    if (!handled) {
1138        ALOGV("PID 0x%04x not handled.", PID);
1139    }
1140
1141    return OK;
1142}
1143
1144void ATSParser::parseAdaptationField(ABitReader *br, unsigned PID) {
1145    unsigned adaptation_field_length = br->getBits(8);
1146
1147    if (adaptation_field_length > 0) {
1148        unsigned discontinuity_indicator = br->getBits(1);
1149
1150        if (discontinuity_indicator) {
1151            ALOGV("PID 0x%04x: discontinuity_indicator = 1 (!!!)", PID);
1152        }
1153
1154        br->skipBits(2);
1155        unsigned PCR_flag = br->getBits(1);
1156
1157        size_t numBitsRead = 4;
1158
1159        if (PCR_flag) {
1160            br->skipBits(4);
1161            uint64_t PCR_base = br->getBits(32);
1162            PCR_base = (PCR_base << 1) | br->getBits(1);
1163
1164            br->skipBits(6);
1165            unsigned PCR_ext = br->getBits(9);
1166
1167            // The number of bytes from the start of the current
1168            // MPEG2 transport stream packet up and including
1169            // the final byte of this PCR_ext field.
1170            size_t byteOffsetFromStartOfTSPacket =
1171                (188 - br->numBitsLeft() / 8);
1172
1173            uint64_t PCR = PCR_base * 300 + PCR_ext;
1174
1175            ALOGV("PID 0x%04x: PCR = 0x%016" PRIx64 " (%.2f)",
1176                  PID, PCR, PCR / 27E6);
1177
1178            // The number of bytes received by this parser up to and
1179            // including the final byte of this PCR_ext field.
1180            size_t byteOffsetFromStart =
1181                mNumTSPacketsParsed * 188 + byteOffsetFromStartOfTSPacket;
1182
1183            for (size_t i = 0; i < mPrograms.size(); ++i) {
1184                updatePCR(PID, PCR, byteOffsetFromStart);
1185            }
1186
1187            numBitsRead += 52;
1188        }
1189
1190        CHECK_GE(adaptation_field_length * 8, numBitsRead);
1191
1192        br->skipBits(adaptation_field_length * 8 - numBitsRead);
1193    }
1194}
1195
1196status_t ATSParser::parseTS(ABitReader *br) {
1197    ALOGV("---");
1198
1199    unsigned sync_byte = br->getBits(8);
1200    CHECK_EQ(sync_byte, 0x47u);
1201
1202    if (br->getBits(1)) {  // transport_error_indicator
1203        // silently ignore.
1204        return OK;
1205    }
1206
1207    unsigned payload_unit_start_indicator = br->getBits(1);
1208    ALOGV("payload_unit_start_indicator = %u", payload_unit_start_indicator);
1209
1210    MY_LOGV("transport_priority = %u", br->getBits(1));
1211
1212    unsigned PID = br->getBits(13);
1213    ALOGV("PID = 0x%04x", PID);
1214
1215    MY_LOGV("transport_scrambling_control = %u", br->getBits(2));
1216
1217    unsigned adaptation_field_control = br->getBits(2);
1218    ALOGV("adaptation_field_control = %u", adaptation_field_control);
1219
1220    unsigned continuity_counter = br->getBits(4);
1221    ALOGV("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter);
1222
1223    // ALOGI("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter);
1224
1225    if (adaptation_field_control == 2 || adaptation_field_control == 3) {
1226        parseAdaptationField(br, PID);
1227    }
1228
1229    status_t err = OK;
1230
1231    if (adaptation_field_control == 1 || adaptation_field_control == 3) {
1232        err = parsePID(
1233                br, PID, continuity_counter, payload_unit_start_indicator);
1234    }
1235
1236    ++mNumTSPacketsParsed;
1237
1238    return err;
1239}
1240
1241sp<MediaSource> ATSParser::getSource(SourceType type) {
1242    int which = -1;  // any
1243
1244    for (size_t i = 0; i < mPrograms.size(); ++i) {
1245        const sp<Program> &program = mPrograms.editItemAt(i);
1246
1247        if (which >= 0 && (int)program->number() != which) {
1248            continue;
1249        }
1250
1251        sp<MediaSource> source = program->getSource(type);
1252
1253        if (source != NULL) {
1254            return source;
1255        }
1256    }
1257
1258    return NULL;
1259}
1260
1261bool ATSParser::PTSTimeDeltaEstablished() {
1262    if (mPrograms.isEmpty()) {
1263        return false;
1264    }
1265
1266    return mPrograms.editItemAt(0)->PTSTimeDeltaEstablished();
1267}
1268
1269void ATSParser::updatePCR(
1270        unsigned /* PID */, uint64_t PCR, size_t byteOffsetFromStart) {
1271    ALOGV("PCR 0x%016" PRIx64 " @ %zu", PCR, byteOffsetFromStart);
1272
1273    if (mNumPCRs == 2) {
1274        mPCR[0] = mPCR[1];
1275        mPCRBytes[0] = mPCRBytes[1];
1276        mSystemTimeUs[0] = mSystemTimeUs[1];
1277        mNumPCRs = 1;
1278    }
1279
1280    mPCR[mNumPCRs] = PCR;
1281    mPCRBytes[mNumPCRs] = byteOffsetFromStart;
1282    mSystemTimeUs[mNumPCRs] = ALooper::GetNowUs();
1283
1284    ++mNumPCRs;
1285
1286    if (mNumPCRs == 2) {
1287        double transportRate =
1288            (mPCRBytes[1] - mPCRBytes[0]) * 27E6 / (mPCR[1] - mPCR[0]);
1289
1290        ALOGV("transportRate = %.2f bytes/sec", transportRate);
1291    }
1292}
1293
1294////////////////////////////////////////////////////////////////////////////////
1295
1296ATSParser::PSISection::PSISection() {
1297}
1298
1299ATSParser::PSISection::~PSISection() {
1300}
1301
1302status_t ATSParser::PSISection::append(const void *data, size_t size) {
1303    if (mBuffer == NULL || mBuffer->size() + size > mBuffer->capacity()) {
1304        size_t newCapacity =
1305            (mBuffer == NULL) ? size : mBuffer->capacity() + size;
1306
1307        newCapacity = (newCapacity + 1023) & ~1023;
1308
1309        sp<ABuffer> newBuffer = new ABuffer(newCapacity);
1310
1311        if (mBuffer != NULL) {
1312            memcpy(newBuffer->data(), mBuffer->data(), mBuffer->size());
1313            newBuffer->setRange(0, mBuffer->size());
1314        } else {
1315            newBuffer->setRange(0, 0);
1316        }
1317
1318        mBuffer = newBuffer;
1319    }
1320
1321    memcpy(mBuffer->data() + mBuffer->size(), data, size);
1322    mBuffer->setRange(0, mBuffer->size() + size);
1323
1324    return OK;
1325}
1326
1327void ATSParser::PSISection::clear() {
1328    if (mBuffer != NULL) {
1329        mBuffer->setRange(0, 0);
1330    }
1331}
1332
1333bool ATSParser::PSISection::isComplete() const {
1334    if (mBuffer == NULL || mBuffer->size() < 3) {
1335        return false;
1336    }
1337
1338    unsigned sectionLength = U16_AT(mBuffer->data() + 1) & 0xfff;
1339    return mBuffer->size() >= sectionLength + 3;
1340}
1341
1342bool ATSParser::PSISection::isEmpty() const {
1343    return mBuffer == NULL || mBuffer->size() == 0;
1344}
1345
1346const uint8_t *ATSParser::PSISection::data() const {
1347    return mBuffer == NULL ? NULL : mBuffer->data();
1348}
1349
1350size_t ATSParser::PSISection::size() const {
1351    return mBuffer == NULL ? 0 : mBuffer->size();
1352}
1353
1354}  // namespace android
1355