M3UParser.cpp revision 404fced9bfa8fa423ee210a271ca051ffd1bec13 
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 "M3UParser"
19#include <utils/Log.h>
20
21#include "M3UParser.h"
22#include <binder/Parcel.h>
23#include <cutils/properties.h>
24#include <media/stagefright/foundation/ADebug.h>
25#include <media/stagefright/foundation/AMessage.h>
26#include <media/stagefright/MediaDefs.h>
27#include <media/stagefright/MediaErrors.h>
28#include <media/stagefright/Utils.h>
29#include <media/mediaplayer.h>
30
31namespace android {
32
33struct M3UParser::MediaGroup : public RefBase {
34    enum Type {
35        TYPE_AUDIO,
36        TYPE_VIDEO,
37        TYPE_SUBS,
38    };
39
40    enum FlagBits {
41        FLAG_AUTOSELECT         = 1,
42        FLAG_DEFAULT            = 2,
43        FLAG_FORCED             = 4,
44        FLAG_HAS_LANGUAGE       = 8,
45        FLAG_HAS_URI            = 16,
46    };
47
48    MediaGroup(Type type);
49
50    Type type() const;
51
52    status_t addMedia(
53            const char *name,
54            const char *uri,
55            const char *language,
56            uint32_t flags);
57
58    bool getActiveURI(AString *uri) const;
59
60    void pickRandomMediaItems();
61    status_t selectTrack(size_t index, bool select);
62    size_t countTracks() const;
63    sp<AMessage> getTrackInfo(size_t index) const;
64
65protected:
66    virtual ~MediaGroup();
67
68private:
69    struct Media {
70        AString mName;
71        AString mURI;
72        AString mLanguage;
73        uint32_t mFlags;
74    };
75
76    Type mType;
77    Vector<Media> mMediaItems;
78
79    ssize_t mSelectedIndex;
80
81    DISALLOW_EVIL_CONSTRUCTORS(MediaGroup);
82};
83
84M3UParser::MediaGroup::MediaGroup(Type type)
85    : mType(type),
86      mSelectedIndex(-1) {
87}
88
89M3UParser::MediaGroup::~MediaGroup() {
90}
91
92M3UParser::MediaGroup::Type M3UParser::MediaGroup::type() const {
93    return mType;
94}
95
96status_t M3UParser::MediaGroup::addMedia(
97        const char *name,
98        const char *uri,
99        const char *language,
100        uint32_t flags) {
101    mMediaItems.push();
102    Media &item = mMediaItems.editItemAt(mMediaItems.size() - 1);
103
104    item.mName = name;
105
106    if (uri) {
107        item.mURI = uri;
108    }
109
110    if (language) {
111        item.mLanguage = language;
112    }
113
114    item.mFlags = flags;
115
116    return OK;
117}
118
119void M3UParser::MediaGroup::pickRandomMediaItems() {
120#if 1
121    switch (mType) {
122        case TYPE_AUDIO:
123        {
124            char value[PROPERTY_VALUE_MAX];
125            if (property_get("media.httplive.audio-index", value, NULL)) {
126                char *end;
127                mSelectedIndex = strtoul(value, &end, 10);
128                CHECK(end > value && *end == '\0');
129
130                if (mSelectedIndex >= (ssize_t)mMediaItems.size()) {
131                    mSelectedIndex = mMediaItems.size() - 1;
132                }
133            } else {
134                mSelectedIndex = 0;
135            }
136            break;
137        }
138
139        case TYPE_VIDEO:
140        {
141            mSelectedIndex = 0;
142            break;
143        }
144
145        case TYPE_SUBS:
146        {
147            mSelectedIndex = -1;
148            break;
149        }
150
151        default:
152            TRESPASS();
153    }
154#else
155    mSelectedIndex = (rand() * mMediaItems.size()) / RAND_MAX;
156#endif
157}
158
159status_t M3UParser::MediaGroup::selectTrack(size_t index, bool select) {
160    if (mType != TYPE_SUBS) {
161        ALOGE("only select subtitile tracks for now!");
162        return INVALID_OPERATION;
163    }
164
165    if (select) {
166        if (index >= mMediaItems.size()) {
167            ALOGE("track %zu does not exist", index);
168            return INVALID_OPERATION;
169        }
170        if (mSelectedIndex == (ssize_t)index) {
171            ALOGE("track %zu already selected", index);
172            return BAD_VALUE;
173        }
174        ALOGV("selected track %zu", index);
175        mSelectedIndex = index;
176    } else {
177        if (mSelectedIndex != (ssize_t)index) {
178            ALOGE("track %zu is not selected", index);
179            return BAD_VALUE;
180        }
181        ALOGV("unselected track %zu", index);
182        mSelectedIndex = -1;
183    }
184
185    return OK;
186}
187
188size_t M3UParser::MediaGroup::countTracks() const {
189    return mMediaItems.size();
190}
191
192sp<AMessage> M3UParser::MediaGroup::getTrackInfo(size_t index) const {
193    if (index >= mMediaItems.size()) {
194        return NULL;
195    }
196
197    sp<AMessage> format = new AMessage();
198
199    int32_t trackType;
200    if (mType == TYPE_AUDIO) {
201        trackType = MEDIA_TRACK_TYPE_AUDIO;
202    } else if (mType == TYPE_VIDEO) {
203        trackType = MEDIA_TRACK_TYPE_VIDEO;
204    } else if (mType == TYPE_SUBS) {
205        trackType = MEDIA_TRACK_TYPE_SUBTITLE;
206    } else {
207        trackType = MEDIA_TRACK_TYPE_UNKNOWN;
208    }
209    format->setInt32("type", trackType);
210
211    const Media &item = mMediaItems.itemAt(index);
212    const char *lang = item.mLanguage.empty() ? "und" : item.mLanguage.c_str();
213    format->setString("language", lang);
214
215    if (mType == TYPE_SUBS) {
216        // TO-DO: pass in a MediaFormat instead
217        format->setString("mime", MEDIA_MIMETYPE_TEXT_VTT);
218        format->setInt32("auto", !!(item.mFlags & MediaGroup::FLAG_AUTOSELECT));
219        format->setInt32("default", !!(item.mFlags & MediaGroup::FLAG_DEFAULT));
220        format->setInt32("forced", !!(item.mFlags & MediaGroup::FLAG_FORCED));
221    }
222
223    return format;
224}
225
226bool M3UParser::MediaGroup::getActiveURI(AString *uri) const {
227    for (size_t i = 0; i < mMediaItems.size(); ++i) {
228        if (mSelectedIndex >= 0 && i == (size_t)mSelectedIndex) {
229            const Media &item = mMediaItems.itemAt(i);
230
231            *uri = item.mURI;
232            return true;
233        }
234    }
235
236    return false;
237}
238
239////////////////////////////////////////////////////////////////////////////////
240
241M3UParser::M3UParser(
242        const char *baseURI, const void *data, size_t size)
243    : mInitCheck(NO_INIT),
244      mBaseURI(baseURI),
245      mIsExtM3U(false),
246      mIsVariantPlaylist(false),
247      mIsComplete(false),
248      mIsEvent(false),
249      mSelectedIndex(-1) {
250    mInitCheck = parse(data, size);
251}
252
253M3UParser::~M3UParser() {
254}
255
256status_t M3UParser::initCheck() const {
257    return mInitCheck;
258}
259
260bool M3UParser::isExtM3U() const {
261    return mIsExtM3U;
262}
263
264bool M3UParser::isVariantPlaylist() const {
265    return mIsVariantPlaylist;
266}
267
268bool M3UParser::isComplete() const {
269    return mIsComplete;
270}
271
272bool M3UParser::isEvent() const {
273    return mIsEvent;
274}
275
276sp<AMessage> M3UParser::meta() {
277    return mMeta;
278}
279
280size_t M3UParser::size() {
281    return mItems.size();
282}
283
284bool M3UParser::itemAt(size_t index, AString *uri, sp<AMessage> *meta) {
285    if (uri) {
286        uri->clear();
287    }
288
289    if (meta) {
290        *meta = NULL;
291    }
292
293    if (index >= mItems.size()) {
294        return false;
295    }
296
297    if (uri) {
298        *uri = mItems.itemAt(index).mURI;
299    }
300
301    if (meta) {
302        *meta = mItems.itemAt(index).mMeta;
303    }
304
305    return true;
306}
307
308void M3UParser::pickRandomMediaItems() {
309    for (size_t i = 0; i < mMediaGroups.size(); ++i) {
310        mMediaGroups.valueAt(i)->pickRandomMediaItems();
311    }
312}
313
314status_t M3UParser::selectTrack(size_t index, bool select) {
315    for (size_t i = 0, ii = index; i < mMediaGroups.size(); ++i) {
316        sp<MediaGroup> group = mMediaGroups.valueAt(i);
317        size_t tracks = group->countTracks();
318        if (ii < tracks) {
319            status_t err = group->selectTrack(ii, select);
320            if (err == OK) {
321                mSelectedIndex = select ? index : -1;
322            }
323            return err;
324        }
325        ii -= tracks;
326    }
327    return INVALID_OPERATION;
328}
329
330size_t M3UParser::getTrackCount() const {
331    size_t trackCount = 0;
332    for (size_t i = 0; i < mMediaGroups.size(); ++i) {
333        trackCount += mMediaGroups.valueAt(i)->countTracks();
334    }
335    return trackCount;
336}
337
338sp<AMessage> M3UParser::getTrackInfo(size_t index) const {
339    for (size_t i = 0, ii = index; i < mMediaGroups.size(); ++i) {
340        sp<MediaGroup> group = mMediaGroups.valueAt(i);
341        size_t tracks = group->countTracks();
342        if (ii < tracks) {
343            return group->getTrackInfo(ii);
344        }
345        ii -= tracks;
346    }
347    return NULL;
348}
349
350ssize_t M3UParser::getSelectedIndex() const {
351    return mSelectedIndex;
352}
353
354bool M3UParser::getTypeURI(size_t index, const char *key, AString *uri) const {
355    if (!mIsVariantPlaylist) {
356        *uri = mBaseURI;
357
358        // Assume media without any more specific attribute contains
359        // audio and video, but no subtitles.
360        return !strcmp("audio", key) || !strcmp("video", key);
361    }
362
363    CHECK_LT(index, mItems.size());
364
365    sp<AMessage> meta = mItems.itemAt(index).mMeta;
366
367    AString groupID;
368    if (!meta->findString(key, &groupID)) {
369        *uri = mItems.itemAt(index).mURI;
370
371        AString codecs;
372        if (!meta->findString("codecs", &codecs)) {
373            // Assume media without any more specific attribute contains
374            // audio and video, but no subtitles.
375            return !strcmp("audio", key) || !strcmp("video", key);
376        } else {
377            // Split the comma separated list of codecs.
378            size_t offset = 0;
379            ssize_t commaPos = -1;
380            codecs.append(',');
381            while ((commaPos = codecs.find(",", offset)) >= 0) {
382                AString codec(codecs, offset, commaPos - offset);
383                codec.trim();
384                // return true only if a codec of type `key` ("audio"/"video")
385                // is found.
386                if (codecIsType(codec, key)) {
387                    return true;
388                }
389                offset = commaPos + 1;
390            }
391            return false;
392        }
393    }
394
395    sp<MediaGroup> group = mMediaGroups.valueFor(groupID);
396    if (!group->getActiveURI(uri)) {
397        return false;
398    }
399
400    if ((*uri).empty()) {
401        *uri = mItems.itemAt(index).mURI;
402    }
403
404    return true;
405}
406
407static bool MakeURL(const char *baseURL, const char *url, AString *out) {
408    out->clear();
409
410    if (strncasecmp("http://", baseURL, 7)
411            && strncasecmp("https://", baseURL, 8)
412            && strncasecmp("file://", baseURL, 7)) {
413        // Base URL must be absolute
414        return false;
415    }
416
417    if (!strncasecmp("http://", url, 7) || !strncasecmp("https://", url, 8)) {
418        // "url" is already an absolute URL, ignore base URL.
419        out->setTo(url);
420
421        ALOGV("base:'%s', url:'%s' => '%s'", baseURL, url, out->c_str());
422
423        return true;
424    }
425
426    if (url[0] == '/') {
427        // URL is an absolute path.
428
429        char *protocolEnd = strstr(baseURL, "//") + 2;
430        char *pathStart = strchr(protocolEnd, '/');
431
432        if (pathStart != NULL) {
433            out->setTo(baseURL, pathStart - baseURL);
434        } else {
435            out->setTo(baseURL);
436        }
437
438        out->append(url);
439    } else {
440        // URL is a relative path
441
442        // Check for a possible query string
443        const char *qsPos = strchr(baseURL, '?');
444        size_t end;
445        if (qsPos != NULL) {
446            end = qsPos - baseURL;
447        } else {
448            end = strlen(baseURL);
449        }
450        // Check for the last slash before a potential query string
451        for (ssize_t pos = end - 1; pos >= 0; pos--) {
452            if (baseURL[pos] == '/') {
453                end = pos;
454                break;
455            }
456        }
457
458        // Check whether the found slash actually is part of the path
459        // and not part of the "http://".
460        if (end > 6) {
461            out->setTo(baseURL, end);
462        } else {
463            out->setTo(baseURL);
464        }
465
466        out->append("/");
467        out->append(url);
468    }
469
470    ALOGV("base:'%s', url:'%s' => '%s'", baseURL, url, out->c_str());
471
472    return true;
473}
474
475status_t M3UParser::parse(const void *_data, size_t size) {
476    int32_t lineNo = 0;
477
478    sp<AMessage> itemMeta;
479
480    const char *data = (const char *)_data;
481    size_t offset = 0;
482    uint64_t segmentRangeOffset = 0;
483    while (offset < size) {
484        size_t offsetLF = offset;
485        while (offsetLF < size && data[offsetLF] != '\n') {
486            ++offsetLF;
487        }
488
489        AString line;
490        if (offsetLF > offset && data[offsetLF - 1] == '\r') {
491            line.setTo(&data[offset], offsetLF - offset - 1);
492        } else {
493            line.setTo(&data[offset], offsetLF - offset);
494        }
495
496        // ALOGI("#%s#", line.c_str());
497
498        if (line.empty()) {
499            offset = offsetLF + 1;
500            continue;
501        }
502
503        if (lineNo == 0 && line == "#EXTM3U") {
504            mIsExtM3U = true;
505        }
506
507        if (mIsExtM3U) {
508            status_t err = OK;
509
510            if (line.startsWith("#EXT-X-TARGETDURATION")) {
511                if (mIsVariantPlaylist) {
512                    return ERROR_MALFORMED;
513                }
514                err = parseMetaData(line, &mMeta, "target-duration");
515            } else if (line.startsWith("#EXT-X-MEDIA-SEQUENCE")) {
516                if (mIsVariantPlaylist) {
517                    return ERROR_MALFORMED;
518                }
519                err = parseMetaData(line, &mMeta, "media-sequence");
520            } else if (line.startsWith("#EXT-X-KEY")) {
521                if (mIsVariantPlaylist) {
522                    return ERROR_MALFORMED;
523                }
524                err = parseCipherInfo(line, &itemMeta, mBaseURI);
525            } else if (line.startsWith("#EXT-X-ENDLIST")) {
526                mIsComplete = true;
527            } else if (line.startsWith("#EXT-X-PLAYLIST-TYPE:EVENT")) {
528                mIsEvent = true;
529            } else if (line.startsWith("#EXTINF")) {
530                if (mIsVariantPlaylist) {
531                    return ERROR_MALFORMED;
532                }
533                err = parseMetaDataDuration(line, &itemMeta, "durationUs");
534            } else if (line.startsWith("#EXT-X-DISCONTINUITY")) {
535                if (mIsVariantPlaylist) {
536                    return ERROR_MALFORMED;
537                }
538                if (itemMeta == NULL) {
539                    itemMeta = new AMessage;
540                }
541                itemMeta->setInt32("discontinuity", true);
542            } else if (line.startsWith("#EXT-X-STREAM-INF")) {
543                if (mMeta != NULL) {
544                    return ERROR_MALFORMED;
545                }
546                mIsVariantPlaylist = true;
547                err = parseStreamInf(line, &itemMeta);
548            } else if (line.startsWith("#EXT-X-BYTERANGE")) {
549                if (mIsVariantPlaylist) {
550                    return ERROR_MALFORMED;
551                }
552
553                uint64_t length, offset;
554                err = parseByteRange(line, segmentRangeOffset, &length, &offset);
555
556                if (err == OK) {
557                    if (itemMeta == NULL) {
558                        itemMeta = new AMessage;
559                    }
560
561                    itemMeta->setInt64("range-offset", offset);
562                    itemMeta->setInt64("range-length", length);
563
564                    segmentRangeOffset = offset + length;
565                }
566            } else if (line.startsWith("#EXT-X-MEDIA")) {
567                err = parseMedia(line);
568            }
569
570            if (err != OK) {
571                return err;
572            }
573        }
574
575        if (!line.startsWith("#")) {
576            if (!mIsVariantPlaylist) {
577                int64_t durationUs;
578                if (itemMeta == NULL
579                        || !itemMeta->findInt64("durationUs", &durationUs)) {
580                    return ERROR_MALFORMED;
581                }
582            }
583
584            mItems.push();
585            Item *item = &mItems.editItemAt(mItems.size() - 1);
586
587            CHECK(MakeURL(mBaseURI.c_str(), line.c_str(), &item->mURI));
588
589            item->mMeta = itemMeta;
590
591            itemMeta.clear();
592        }
593
594        offset = offsetLF + 1;
595        ++lineNo;
596    }
597
598    return OK;
599}
600
601// static
602status_t M3UParser::parseMetaData(
603        const AString &line, sp<AMessage> *meta, const char *key) {
604    ssize_t colonPos = line.find(":");
605
606    if (colonPos < 0) {
607        return ERROR_MALFORMED;
608    }
609
610    int32_t x;
611    status_t err = ParseInt32(line.c_str() + colonPos + 1, &x);
612
613    if (err != OK) {
614        return err;
615    }
616
617    if (meta->get() == NULL) {
618        *meta = new AMessage;
619    }
620    (*meta)->setInt32(key, x);
621
622    return OK;
623}
624
625// static
626status_t M3UParser::parseMetaDataDuration(
627        const AString &line, sp<AMessage> *meta, const char *key) {
628    ssize_t colonPos = line.find(":");
629
630    if (colonPos < 0) {
631        return ERROR_MALFORMED;
632    }
633
634    double x;
635    status_t err = ParseDouble(line.c_str() + colonPos + 1, &x);
636
637    if (err != OK) {
638        return err;
639    }
640
641    if (meta->get() == NULL) {
642        *meta = new AMessage;
643    }
644    (*meta)->setInt64(key, (int64_t)(x * 1E6));
645
646    return OK;
647}
648
649// Find the next occurence of the character "what" at or after "offset",
650// but ignore occurences between quotation marks.
651// Return the index of the occurrence or -1 if not found.
652static ssize_t FindNextUnquoted(
653        const AString &line, char what, size_t offset) {
654    CHECK_NE((int)what, (int)'"');
655
656    bool quoted = false;
657    while (offset < line.size()) {
658        char c = line.c_str()[offset];
659
660        if (c == '"') {
661            quoted = !quoted;
662        } else if (c == what && !quoted) {
663            return offset;
664        }
665
666        ++offset;
667    }
668
669    return -1;
670}
671
672status_t M3UParser::parseStreamInf(
673        const AString &line, sp<AMessage> *meta) const {
674    ssize_t colonPos = line.find(":");
675
676    if (colonPos < 0) {
677        return ERROR_MALFORMED;
678    }
679
680    size_t offset = colonPos + 1;
681
682    while (offset < line.size()) {
683        ssize_t end = FindNextUnquoted(line, ',', offset);
684        if (end < 0) {
685            end = line.size();
686        }
687
688        AString attr(line, offset, end - offset);
689        attr.trim();
690
691        offset = end + 1;
692
693        ssize_t equalPos = attr.find("=");
694        if (equalPos < 0) {
695            continue;
696        }
697
698        AString key(attr, 0, equalPos);
699        key.trim();
700
701        AString val(attr, equalPos + 1, attr.size() - equalPos - 1);
702        val.trim();
703
704        ALOGV("key=%s value=%s", key.c_str(), val.c_str());
705
706        if (!strcasecmp("bandwidth", key.c_str())) {
707            const char *s = val.c_str();
708            char *end;
709            unsigned long x = strtoul(s, &end, 10);
710
711            if (end == s || *end != '\0') {
712                // malformed
713                continue;
714            }
715
716            if (meta->get() == NULL) {
717                *meta = new AMessage;
718            }
719            (*meta)->setInt32("bandwidth", x);
720        } else if (!strcasecmp("codecs", key.c_str())) {
721            if (!isQuotedString(val)) {
722                ALOGE("Expected quoted string for %s attribute, "
723                      "got '%s' instead.",
724                      key.c_str(), val.c_str());;
725
726                return ERROR_MALFORMED;
727            }
728
729            key.tolower();
730            const AString &codecs = unquoteString(val);
731            (*meta)->setString(key.c_str(), codecs.c_str());
732        } else if (!strcasecmp("audio", key.c_str())
733                || !strcasecmp("video", key.c_str())
734                || !strcasecmp("subtitles", key.c_str())) {
735            if (!isQuotedString(val)) {
736                ALOGE("Expected quoted string for %s attribute, "
737                      "got '%s' instead.",
738                      key.c_str(), val.c_str());
739
740                return ERROR_MALFORMED;
741            }
742
743            const AString &groupID = unquoteString(val);
744            ssize_t groupIndex = mMediaGroups.indexOfKey(groupID);
745
746            if (groupIndex < 0) {
747                ALOGE("Undefined media group '%s' referenced in stream info.",
748                      groupID.c_str());
749
750                return ERROR_MALFORMED;
751            }
752
753            key.tolower();
754            (*meta)->setString(key.c_str(), groupID.c_str());
755        }
756    }
757
758    return OK;
759}
760
761// static
762status_t M3UParser::parseCipherInfo(
763        const AString &line, sp<AMessage> *meta, const AString &baseURI) {
764    ssize_t colonPos = line.find(":");
765
766    if (colonPos < 0) {
767        return ERROR_MALFORMED;
768    }
769
770    size_t offset = colonPos + 1;
771
772    while (offset < line.size()) {
773        ssize_t end = FindNextUnquoted(line, ',', offset);
774        if (end < 0) {
775            end = line.size();
776        }
777
778        AString attr(line, offset, end - offset);
779        attr.trim();
780
781        offset = end + 1;
782
783        ssize_t equalPos = attr.find("=");
784        if (equalPos < 0) {
785            continue;
786        }
787
788        AString key(attr, 0, equalPos);
789        key.trim();
790
791        AString val(attr, equalPos + 1, attr.size() - equalPos - 1);
792        val.trim();
793
794        ALOGV("key=%s value=%s", key.c_str(), val.c_str());
795
796        key.tolower();
797
798        if (key == "method" || key == "uri" || key == "iv") {
799            if (meta->get() == NULL) {
800                *meta = new AMessage;
801            }
802
803            if (key == "uri") {
804                if (val.size() >= 2
805                        && val.c_str()[0] == '"'
806                        && val.c_str()[val.size() - 1] == '"') {
807                    // Remove surrounding quotes.
808                    AString tmp(val, 1, val.size() - 2);
809                    val = tmp;
810                }
811
812                AString absURI;
813                if (MakeURL(baseURI.c_str(), val.c_str(), &absURI)) {
814                    val = absURI;
815                } else {
816                    ALOGE("failed to make absolute url for %s.",
817                            uriDebugString(baseURI).c_str());
818                }
819            }
820
821            key.insert(AString("cipher-"), 0);
822
823            (*meta)->setString(key.c_str(), val.c_str(), val.size());
824        }
825    }
826
827    return OK;
828}
829
830// static
831status_t M3UParser::parseByteRange(
832        const AString &line, uint64_t curOffset,
833        uint64_t *length, uint64_t *offset) {
834    ssize_t colonPos = line.find(":");
835
836    if (colonPos < 0) {
837        return ERROR_MALFORMED;
838    }
839
840    ssize_t atPos = line.find("@", colonPos + 1);
841
842    AString lenStr;
843    if (atPos < 0) {
844        lenStr = AString(line, colonPos + 1, line.size() - colonPos - 1);
845    } else {
846        lenStr = AString(line, colonPos + 1, atPos - colonPos - 1);
847    }
848
849    lenStr.trim();
850
851    const char *s = lenStr.c_str();
852    char *end;
853    *length = strtoull(s, &end, 10);
854
855    if (s == end || *end != '\0') {
856        return ERROR_MALFORMED;
857    }
858
859    if (atPos >= 0) {
860        AString offStr = AString(line, atPos + 1, line.size() - atPos - 1);
861        offStr.trim();
862
863        const char *s = offStr.c_str();
864        *offset = strtoull(s, &end, 10);
865
866        if (s == end || *end != '\0') {
867            return ERROR_MALFORMED;
868        }
869    } else {
870        *offset = curOffset;
871    }
872
873    return OK;
874}
875
876status_t M3UParser::parseMedia(const AString &line) {
877    ssize_t colonPos = line.find(":");
878
879    if (colonPos < 0) {
880        return ERROR_MALFORMED;
881    }
882
883    bool haveGroupType = false;
884    MediaGroup::Type groupType = MediaGroup::TYPE_AUDIO;
885
886    bool haveGroupID = false;
887    AString groupID;
888
889    bool haveGroupLanguage = false;
890    AString groupLanguage;
891
892    bool haveGroupName = false;
893    AString groupName;
894
895    bool haveGroupAutoselect = false;
896    bool groupAutoselect = false;
897
898    bool haveGroupDefault = false;
899    bool groupDefault = false;
900
901    bool haveGroupForced = false;
902    bool groupForced = false;
903
904    bool haveGroupURI = false;
905    AString groupURI;
906
907    size_t offset = colonPos + 1;
908
909    while (offset < line.size()) {
910        ssize_t end = FindNextUnquoted(line, ',', offset);
911        if (end < 0) {
912            end = line.size();
913        }
914
915        AString attr(line, offset, end - offset);
916        attr.trim();
917
918        offset = end + 1;
919
920        ssize_t equalPos = attr.find("=");
921        if (equalPos < 0) {
922            continue;
923        }
924
925        AString key(attr, 0, equalPos);
926        key.trim();
927
928        AString val(attr, equalPos + 1, attr.size() - equalPos - 1);
929        val.trim();
930
931        ALOGV("key=%s value=%s", key.c_str(), val.c_str());
932
933        if (!strcasecmp("type", key.c_str())) {
934            if (!strcasecmp("subtitles", val.c_str())) {
935                groupType = MediaGroup::TYPE_SUBS;
936            } else if (!strcasecmp("audio", val.c_str())) {
937                groupType = MediaGroup::TYPE_AUDIO;
938            } else if (!strcasecmp("video", val.c_str())) {
939                groupType = MediaGroup::TYPE_VIDEO;
940            } else {
941                ALOGE("Invalid media group type '%s'", val.c_str());
942                return ERROR_MALFORMED;
943            }
944
945            haveGroupType = true;
946        } else if (!strcasecmp("group-id", key.c_str())) {
947            if (val.size() < 2
948                    || val.c_str()[0] != '"'
949                    || val.c_str()[val.size() - 1] != '"') {
950                ALOGE("Expected quoted string for GROUP-ID, got '%s' instead.",
951                      val.c_str());
952
953                return ERROR_MALFORMED;
954            }
955
956            groupID.setTo(val, 1, val.size() - 2);
957            haveGroupID = true;
958        } else if (!strcasecmp("language", key.c_str())) {
959            if (val.size() < 2
960                    || val.c_str()[0] != '"'
961                    || val.c_str()[val.size() - 1] != '"') {
962                ALOGE("Expected quoted string for LANGUAGE, got '%s' instead.",
963                      val.c_str());
964
965                return ERROR_MALFORMED;
966            }
967
968            groupLanguage.setTo(val, 1, val.size() - 2);
969            haveGroupLanguage = true;
970        } else if (!strcasecmp("name", key.c_str())) {
971            if (val.size() < 2
972                    || val.c_str()[0] != '"'
973                    || val.c_str()[val.size() - 1] != '"') {
974                ALOGE("Expected quoted string for NAME, got '%s' instead.",
975                      val.c_str());
976
977                return ERROR_MALFORMED;
978            }
979
980            groupName.setTo(val, 1, val.size() - 2);
981            haveGroupName = true;
982        } else if (!strcasecmp("autoselect", key.c_str())) {
983            groupAutoselect = false;
984            if (!strcasecmp("YES", val.c_str())) {
985                groupAutoselect = true;
986            } else if (!strcasecmp("NO", val.c_str())) {
987                groupAutoselect = false;
988            } else {
989                ALOGE("Expected YES or NO for AUTOSELECT attribute, "
990                      "got '%s' instead.",
991                      val.c_str());
992
993                return ERROR_MALFORMED;
994            }
995
996            haveGroupAutoselect = true;
997        } else if (!strcasecmp("default", key.c_str())) {
998            groupDefault = false;
999            if (!strcasecmp("YES", val.c_str())) {
1000                groupDefault = true;
1001            } else if (!strcasecmp("NO", val.c_str())) {
1002                groupDefault = false;
1003            } else {
1004                ALOGE("Expected YES or NO for DEFAULT attribute, "
1005                      "got '%s' instead.",
1006                      val.c_str());
1007
1008                return ERROR_MALFORMED;
1009            }
1010
1011            haveGroupDefault = true;
1012        } else if (!strcasecmp("forced", key.c_str())) {
1013            groupForced = false;
1014            if (!strcasecmp("YES", val.c_str())) {
1015                groupForced = true;
1016            } else if (!strcasecmp("NO", val.c_str())) {
1017                groupForced = false;
1018            } else {
1019                ALOGE("Expected YES or NO for FORCED attribute, "
1020                      "got '%s' instead.",
1021                      val.c_str());
1022
1023                return ERROR_MALFORMED;
1024            }
1025
1026            haveGroupForced = true;
1027        } else if (!strcasecmp("uri", key.c_str())) {
1028            if (val.size() < 2
1029                    || val.c_str()[0] != '"'
1030                    || val.c_str()[val.size() - 1] != '"') {
1031                ALOGE("Expected quoted string for URI, got '%s' instead.",
1032                      val.c_str());
1033
1034                return ERROR_MALFORMED;
1035            }
1036
1037            AString tmp(val, 1, val.size() - 2);
1038
1039            if (!MakeURL(mBaseURI.c_str(), tmp.c_str(), &groupURI)) {
1040                ALOGI("Failed to make absolute URI from '%s'.", tmp.c_str());
1041            }
1042
1043            haveGroupURI = true;
1044        }
1045    }
1046
1047    if (!haveGroupType || !haveGroupID || !haveGroupName) {
1048        ALOGE("Incomplete EXT-X-MEDIA element.");
1049        return ERROR_MALFORMED;
1050    }
1051
1052    uint32_t flags = 0;
1053    if (haveGroupAutoselect && groupAutoselect) {
1054        flags |= MediaGroup::FLAG_AUTOSELECT;
1055    }
1056    if (haveGroupDefault && groupDefault) {
1057        flags |= MediaGroup::FLAG_DEFAULT;
1058    }
1059    if (haveGroupForced) {
1060        if (groupType != MediaGroup::TYPE_SUBS) {
1061            ALOGE("The FORCED attribute MUST not be present on anything "
1062                  "but SUBS media.");
1063
1064            return ERROR_MALFORMED;
1065        }
1066
1067        if (groupForced) {
1068            flags |= MediaGroup::FLAG_FORCED;
1069        }
1070    }
1071    if (haveGroupLanguage) {
1072        flags |= MediaGroup::FLAG_HAS_LANGUAGE;
1073    }
1074    if (haveGroupURI) {
1075        flags |= MediaGroup::FLAG_HAS_URI;
1076    }
1077
1078    ssize_t groupIndex = mMediaGroups.indexOfKey(groupID);
1079    sp<MediaGroup> group;
1080
1081    if (groupIndex < 0) {
1082        group = new MediaGroup(groupType);
1083        mMediaGroups.add(groupID, group);
1084    } else {
1085        group = mMediaGroups.valueAt(groupIndex);
1086
1087        if (group->type() != groupType) {
1088            ALOGE("Attempt to put media item under group of different type "
1089                  "(groupType = %d, item type = %d",
1090                  group->type(),
1091                  groupType);
1092
1093            return ERROR_MALFORMED;
1094        }
1095    }
1096
1097    return group->addMedia(
1098            groupName.c_str(),
1099            haveGroupURI ? groupURI.c_str() : NULL,
1100            haveGroupLanguage ? groupLanguage.c_str() : NULL,
1101            flags);
1102}
1103
1104// static
1105status_t M3UParser::ParseInt32(const char *s, int32_t *x) {
1106    char *end;
1107    long lval = strtol(s, &end, 10);
1108
1109    if (end == s || (*end != '\0' && *end != ',')) {
1110        return ERROR_MALFORMED;
1111    }
1112
1113    *x = (int32_t)lval;
1114
1115    return OK;
1116}
1117
1118// static
1119status_t M3UParser::ParseDouble(const char *s, double *x) {
1120    char *end;
1121    double dval = strtod(s, &end);
1122
1123    if (end == s || (*end != '\0' && *end != ',')) {
1124        return ERROR_MALFORMED;
1125    }
1126
1127    *x = dval;
1128
1129    return OK;
1130}
1131
1132// static
1133bool M3UParser::isQuotedString(const AString &str) {
1134    if (str.size() < 2
1135            || str.c_str()[0] != '"'
1136            || str.c_str()[str.size() - 1] != '"') {
1137        return false;
1138    }
1139    return true;
1140}
1141
1142// static
1143AString M3UParser::unquoteString(const AString &str) {
1144     if (!isQuotedString(str)) {
1145         return str;
1146     }
1147     return AString(str, 1, str.size() - 2);
1148}
1149
1150// static
1151bool M3UParser::codecIsType(const AString &codec, const char *type) {
1152    if (codec.size() < 4) {
1153        return false;
1154    }
1155    const char *c = codec.c_str();
1156    switch (FOURCC(c[0], c[1], c[2], c[3])) {
1157        // List extracted from http://www.mp4ra.org/codecs.html
1158        case 'ac-3':
1159        case 'alac':
1160        case 'dra1':
1161        case 'dtsc':
1162        case 'dtse':
1163        case 'dtsh':
1164        case 'dtsl':
1165        case 'ec-3':
1166        case 'enca':
1167        case 'g719':
1168        case 'g726':
1169        case 'm4ae':
1170        case 'mlpa':
1171        case 'mp4a':
1172        case 'raw ':
1173        case 'samr':
1174        case 'sawb':
1175        case 'sawp':
1176        case 'sevc':
1177        case 'sqcp':
1178        case 'ssmv':
1179        case 'twos':
1180        case 'agsm':
1181        case 'alaw':
1182        case 'dvi ':
1183        case 'fl32':
1184        case 'fl64':
1185        case 'ima4':
1186        case 'in24':
1187        case 'in32':
1188        case 'lpcm':
1189        case 'Qclp':
1190        case 'QDM2':
1191        case 'QDMC':
1192        case 'ulaw':
1193        case 'vdva':
1194            return !strcmp("audio", type);
1195
1196        case 'avc1':
1197        case 'avc2':
1198        case 'avcp':
1199        case 'drac':
1200        case 'encv':
1201        case 'mjp2':
1202        case 'mp4v':
1203        case 'mvc1':
1204        case 'mvc2':
1205        case 'resv':
1206        case 's263':
1207        case 'svc1':
1208        case 'vc-1':
1209        case 'CFHD':
1210        case 'civd':
1211        case 'DV10':
1212        case 'dvh5':
1213        case 'dvh6':
1214        case 'dvhp':
1215        case 'DVOO':
1216        case 'DVOR':
1217        case 'DVTV':
1218        case 'DVVT':
1219        case 'flic':
1220        case 'gif ':
1221        case 'h261':
1222        case 'h263':
1223        case 'HD10':
1224        case 'jpeg':
1225        case 'M105':
1226        case 'mjpa':
1227        case 'mjpb':
1228        case 'png ':
1229        case 'PNTG':
1230        case 'rle ':
1231        case 'rpza':
1232        case 'Shr0':
1233        case 'Shr1':
1234        case 'Shr2':
1235        case 'Shr3':
1236        case 'Shr4':
1237        case 'SVQ1':
1238        case 'SVQ3':
1239        case 'tga ':
1240        case 'tiff':
1241        case 'WRLE':
1242            return !strcmp("video", type);
1243
1244        default:
1245            return false;
1246    }
1247}
1248
1249}  // namespace android
1250