C++ String8::isEmpty方法代码示例

void TextureTracker::update(int textureId, bool ghost, String8 name) {
    Mutex::Autolock _l(mLock);
    TextureEntry entry(textureId);
    ssize_t index = mMemoryList.indexOf(entry);

    if (index >= 0) {
        TextureEntry& item = mMemoryList.editItemAt(index);
        TTLOGD("[TT]update before %s %d %d %d %d %d\n", item.mName.string(), item.mId, item.mWidth, item.mHeight,
               item.mMemory, item.mGhost);

        item.mGhost = ghost;

        if (name.isEmpty()) {
            if (!ghost) {
                item.mName = mViews.top();
            }
        } else {
            item.mName = name;
        }


        entry = mMemoryList.itemAt(index);
        TTLOGD("[TT]update after %s %d %d %d %d %d\n", entry.mName.string(), entry.mId, entry.mWidth, entry.mHeight,
               entry.mMemory, entry.mGhost);
    } else {
        TTLOGD("[TT]update not found %d", textureId);
    }

}

bool
ParamsManager::
splitInt(String8 const& s8Input, Vector<int>& rOutput)
{
    rOutput.clear();
    //
    if  ( s8Input.isEmpty() )
    {
        MY_LOGW("empty string");
        return  false;
    }
    //
    char const*start = s8Input.string();
    char *end = NULL;
    do {
        int value = ::strtol(start, &end, 10);
        if  ( start == end ) {
            MY_LOGW_IF(0, "no digits in str:%s", s8Input.string());
            return  false;
        }
        rOutput.push_back(value);
        MY_LOGD_IF(0, "%d", value);
        start = end + 1;
    } while ( end && *end );
    //
    return  (rOutput.size() > 0);
}

// static
sp<DataSource> DataSource::CreateFromURI(
        const char *uri, const KeyedVector<String8, String8> *headers) {
    bool isWidevine = !strncasecmp("widevine://", uri, 11);

    sp<DataSource> source;
    if (!strncasecmp("file://", uri, 7)) {
        source = new FileSource(uri + 7);
    } else if (!strncasecmp("http://", uri, 7)
            || !strncasecmp("https://", uri, 8)
            || isWidevine) {
        sp<HTTPBase> httpSource = HTTPBase::Create();

        String8 tmp;
        if (isWidevine) {
            tmp = String8("http://");
            tmp.append(uri + 11);

            uri = tmp.string();
        }

        if (httpSource->connect(uri, headers) != OK) {
            return NULL;
        }

        if (!isWidevine) {
            String8 cacheConfig;
            bool disconnectAtHighwatermark;
            if (headers != NULL) {
                KeyedVector<String8, String8> copy = *headers;
                NuCachedSource2::RemoveCacheSpecificHeaders(
                        &copy, &cacheConfig, &disconnectAtHighwatermark);
            }

            source = new NuCachedSource2(
                    httpSource,
                    cacheConfig.isEmpty() ? NULL : cacheConfig.string());
        } else {
            // We do not want that prefetching, caching, datasource wrapper
            // in the widevine:// case.
            source = httpSource;
        }

# if CHROMIUM_AVAILABLE
    } else if (!strncasecmp("data:", uri, 5)) {
        source = createDataUriSource(uri);
#endif
    } else {
        // Assume it's a filename.
        source = new FileSource(uri);
    }

    if (source == NULL || source->initCheck() != OK) {
        return NULL;
    }

    return source;
}

    status_t PropertyMap::Parser::parse() {
        while (!mTokenizer->isEof()) {
#if DEBUG_PARSER
            ALOGD("Parsing %s: '%s'.", mTokenizer->getLocation().string(),
                    mTokenizer->peekRemainderOfLine().string());
#endif

            mTokenizer->skipDelimiters(WHITESPACE);

            if (!mTokenizer->isEol() && mTokenizer->peekChar() != '#') {
                String8 keyToken = mTokenizer->nextToken(WHITESPACE_OR_PROPERTY_DELIMITER);
                if (keyToken.isEmpty()) {
                    ALOGE("%s: Expected non-empty property key.",
                          mTokenizer->getLocation().string());
                    return BAD_VALUE;
                }

                mTokenizer->skipDelimiters(WHITESPACE);

                if (mTokenizer->nextChar() != '=') {
                    ALOGE("%s: Expected '=' between property key and value.",
                          mTokenizer->getLocation().string());
                    return BAD_VALUE;
                }

                mTokenizer->skipDelimiters(WHITESPACE);

                String8 valueToken = mTokenizer->nextToken(WHITESPACE);
                if (valueToken.find("\\", 0) >= 0 || valueToken.find("\"", 0) >= 0) {
                    ALOGE("%s: Found reserved character '\\' or '\"' in property value.",
                          mTokenizer->getLocation().string());
                    return BAD_VALUE;
                }

                mTokenizer->skipDelimiters(WHITESPACE);
                if (!mTokenizer->isEol()) {
                    ALOGE("%s: Expected end of line, got '%s'.",
                          mTokenizer->getLocation().string(),
                          mTokenizer->peekRemainderOfLine().string());
                    return BAD_VALUE;
                }

                if (mMap->hasProperty(keyToken)) {
                    ALOGE("%s: Duplicate property value for key '%s'.",
                          mTokenizer->getLocation().string(), keyToken.string());
                    return BAD_VALUE;
                }

                mMap->addProperty(keyToken, valueToken);
            }

            mTokenizer->nextLine();
        }
        return NO_ERROR;
    }

static int readFromFile(const String8& path, char* buf, size_t size)
{
    if (path.isEmpty())
        return -1;
    int fd = open(path.string(), O_RDONLY, 0);
    if (fd == -1) {
        ALOGE("Could not open '%s'", path.string());
        return -1;
    }
    
    ssize_t count = read(fd, buf, size);
    if (count > 0) {
        while (count > 0 && buf[count-1] == '\n')
            count--;
        buf[count] = '\0';
    } else {
        buf[0] = '\0';
    } 

    close(fd);
    return count;
}

int BatteryMonitor::readFromFile(const String8& path, char* buf, size_t size) {
    char *cp = NULL;

    if (path.isEmpty())
        return -1;
    int fd = open(path.string(), O_RDONLY, 0);
    if (fd == -1) {
        KLOG_ERROR(LOG_TAG, "Could not open '%s'\n", path.string());
        return -1;
    }

    ssize_t count = TEMP_FAILURE_RETRY(read(fd, buf, size));
    if (count > 0)
        cp = (char *)memrchr(buf, '\n', count);

    if (cp)
        *cp = '\0';
    else
        buf[0] = '\0';

    close(fd);
    return count;
}

void DisplayDevice::setDisplayName(const String8& displayName) {
    if (!displayName.isEmpty()) {
        // never override the name with an empty name
        mDisplayName = displayName;
    }
}

status_t
CamAdapter::
setParameters()
{
    MY_LOGD("+");
    status_t ret = OK;
    //
    //(1) must set to mpPreviewCmdQueThread earlier than to 3A
    if ( mpPreviewCmdQueThread != 0 )
    {
        if ( ! mpPreviewCmdQueThread->setParameters() )
        {
            MY_LOGE("mpPreviewCmdQueThread->setParameters fail");
        }
    }
    else
    {
        MY_LOGE("mpPreviewCmdQueThread is NULL");
    }

    // (2) get Param from 3A
    NS3A::Param_T cam3aParam;
    Hal3ABase* p3AHal = Hal3ABase::createInstance(DevMetaInfo::queryHalSensorDev(getOpenId()));
    if ( ! p3AHal )
    {
        MY_LOGE("p3AHal == NULL");
        return INVALID_OPERATION;
    }
    //
    if ( ! p3AHal->getParams(cam3aParam) )
    {
        MY_LOGE("getParams fail");
        ret = INVALID_OPERATION;
        goto lbExit;
    }

    //(3) set Param to 3A
#define UPDATE_PARAMS(param, eMapXXX, key) \
    do { \
        String8 const s = mpParamsMgr->getStr(key); \
        if  ( ! s.isEmpty() ) { \
            param = PARAMSMANAGER_MAP_INST(eMapXXX)->valueFor(s); \
        } \
    } while (0)

    // DEFAULT DEFINITION CATEGORY
    cam3aParam.i4MinFps   = 5000;
    cam3aParam.i4MaxFps   = 60000;
    //
    UPDATE_PARAMS(cam3aParam.u4AfMode, eMapFocusMode, CameraParameters::KEY_FOCUS_MODE);
    UPDATE_PARAMS(cam3aParam.u4AwbMode, eMapWhiteBalance, CameraParameters::KEY_WHITE_BALANCE);
    UPDATE_PARAMS(cam3aParam.u4SceneMode, eMapScene, CameraParameters::KEY_SCENE_MODE);
    UPDATE_PARAMS(cam3aParam.u4StrobeMode, eMapFlashMode, CameraParameters::KEY_FLASH_MODE);
    UPDATE_PARAMS(cam3aParam.u4EffectMode, eMapEffect, CameraParameters::KEY_EFFECT);
    UPDATE_PARAMS(cam3aParam.u4AntiBandingMode, eMapAntiBanding, CameraParameters::KEY_ANTIBANDING); 
    //
    cam3aParam.i4ExpIndex = mpParamsMgr->getInt(CameraParameters::KEY_EXPOSURE_COMPENSATION);
    cam3aParam.fExpCompStep = mpParamsMgr->getFloat(CameraParameters::KEY_EXPOSURE_COMPENSATION_STEP);
    //
    // AE lock 
    {
        String8 const s = mpParamsMgr->getStr(CameraParameters::KEY_AUTO_EXPOSURE_LOCK);
        cam3aParam.bIsAELock = ( ! s.isEmpty() && s == CameraParameters::TRUE ) ? 1 : 0; 
    }
    // AWB lock 
    {
        String8 const s = mpParamsMgr->getStr(CameraParameters::KEY_AUTO_WHITEBALANCE_LOCK);
        cam3aParam.bIsAWBLock = ( ! s.isEmpty() && s == CameraParameters::TRUE ) ? 1 : 0;
    }
    // AF Focus Areas 
    {
        String8 const s8Area = mpParamsMgr->getStr(CameraParameters::KEY_FOCUS_AREAS);
        if  ( ! s8Area.isEmpty() )
        {
            MY_LOGD("Focus Areas:%s", s8Area.string());
            const int maxNumFocusAreas = mpParamsMgr->getInt(CameraParameters::KEY_MAX_NUM_FOCUS_AREAS);
            List <camera_area_t> focusAreas;
            mpParamsMgr->parseCamAreas(s8Area.string(), focusAreas, maxNumFocusAreas);
            int index = 0;
            for (List<camera_area_t>::iterator it = focusAreas.begin(); it != focusAreas.end(); it++) {
                cam3aParam.rFocusAreas.rAreas[index].i4Left = it->left;
                cam3aParam.rFocusAreas.rAreas[index].i4Top = it->top;
                cam3aParam.rFocusAreas.rAreas[index].i4Right = it->right;
                cam3aParam.rFocusAreas.rAreas[index].i4Bottom = it->bottom;
                cam3aParam.rFocusAreas.rAreas[index].i4Weight = it->weight;
                index++;
            }
            cam3aParam.rFocusAreas.u4Count = focusAreas.size();
        }
    }
    // AE Metering Areas 
    {
        String8 const s8Area = mpParamsMgr->getStr(CameraParameters::KEY_METERING_AREAS);
        if  ( ! s8Area.isEmpty() )
        {
            MY_LOGD("Metering Areas:%s", s8Area.string());
            const int maxNumMeteringAreas = mpParamsMgr->getInt(CameraParameters::KEY_MAX_NUM_METERING_AREAS);
            List <camera_area_t> meterAreas;
            mpParamsMgr->parseCamAreas(s8Area.string(), meterAreas, maxNumMeteringAreas);
            int index = 0;
//.........这里部分代码省略.........

static void CameraMetadata_dump(JNIEnv *env, jobject thiz) {
    ALOGV("%s", __FUNCTION__);
    CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz);
    if (metadata == NULL) {
        return;
    }

    /*
     * Create a socket pair for local streaming read/writes.
     *
     * The metadata will be dumped into the write side,
     * and then read back out (and logged) via the read side.
     */

    int writeFd, readFd;
    {

        int sv[2];
        if (socketpair(AF_LOCAL, SOCK_STREAM, /*protocol*/0, &sv[0]) < 0) {
            jniThrowExceptionFmt(env, "java/io/IOException",
                    "Failed to create socketpair (errno = %#x, message = '%s')",
                    errno, strerror(errno));
            return;
        }
        writeFd = sv[0];
        readFd = sv[1];
    }

    /*
     * Create a thread for doing the writing.
     *
     * The reading and writing must be concurrent, otherwise
     * the write will block forever once it exhausts the capped
     * buffer size (from getsockopt).
     */
    pthread_t writeThread;
    DumpMetadataParams params = {
        writeFd,
        metadata
    };

    {
        int threadRet = pthread_create(&writeThread, /*attr*/NULL,
                CameraMetadata_writeMetadataThread, (void*)&params);

        if (threadRet != 0) {
            close(writeFd);

            jniThrowExceptionFmt(env, "java/io/IOException",
                    "Failed to create thread for writing (errno = %#x, message = '%s')",
                    threadRet, strerror(threadRet));
        }
    }

    /*
     * Read out a byte until stream is complete. Write completed lines
     * to ALOG.
     */
    {
        char out[] = {'\0', '\0'}; // large enough to append as a string
        String8 logLine;

        // Read one byte at a time! Very slow but avoids complicated \n scanning.
        ssize_t res;
        while ((res = TEMP_FAILURE_RETRY(read(readFd, &out[0], /*count*/1))) > 0) {
            if (out[0] == '\n') {
                ALOGD("%s", logLine.string());
                logLine.clear();
            } else {
                logLine.append(out);
            }
        }

        if (res < 0) {
            jniThrowExceptionFmt(env, "java/io/IOException",
                    "Failed to read from fd (errno = %#x, message = '%s')",
                    errno, strerror(errno));
            //return;
        } else if (!logLine.isEmpty()) {
            ALOGD("%s", logLine.string());
        }
    }

    int res;

    // Join until thread finishes. Ensures params/metadata is valid until then.
    if ((res = pthread_join(writeThread, /*retval*/NULL)) != 0) {
        ALOGE("%s: Failed to join thread (errno = %#x, message = '%s')",
                __FUNCTION__, res, strerror(res));
    }
}

String8 KeyMap::getPath(const InputDeviceIdentifier& deviceIdentifier,
        const String8& name, InputDeviceConfigurationFileType type) {
    return name.isEmpty()
            ? getInputDeviceConfigurationFilePathByDeviceIdentifier(deviceIdentifier, type)
            : getInputDeviceConfigurationFilePathByName(name, type);
}

//.........这里部分代码省略.........
            // (but are retained here for documentary purposes.)
            //bool specCompassFeature = false;
            //bool specAccelerometerFeature = false;
            //bool specProximityFeature = false;
            //bool specAmbientLightFeature = false;
            //bool specLiveWallpaperFeature = false;

            int targetSdk = 0;
            int smallScreen = 1;
            int normalScreen = 1;
            int largeScreen = 1;
            int xlargeScreen = 1;
            int anyDensity = 1;
            int requiresSmallestWidthDp = 0;
            int compatibleWidthLimitDp = 0;
            int largestWidthLimitDp = 0;
            String8 pkg;
            String8 activityName;
            String8 activityLabel;
            String8 activityIcon;
            String8 activityBanner;
            String8 receiverName;
            String8 serviceName;
            Vector<String8> supportedInput;

            FeatureGroup commonFeatures;
            Vector<FeatureGroup> featureGroups;
            KeyedVector<String8, ImpliedFeature> impliedFeatures;

            while ((code=tree.next()) != ResXMLTree::END_DOCUMENT && code != ResXMLTree::BAD_DOCUMENT) {
                if (code == ResXMLTree::END_TAG) {
                    depth--;
                    if (depth < 2) {
                        if (withinSupportsInput && !supportedInput.isEmpty()) {
                            printf("supports-input: '");
                            const size_t N = supportedInput.size();
                            for (size_t i=0; i<N; i++) {
                                printf("%s", ResTable::normalizeForOutput(
                                        supportedInput[i].string()).string());
                                if (i != N - 1) {
                                    printf("' '");
                                } else {
                                    printf("'\n");
                                }
                            }
                            supportedInput.clear();
                        }
                        withinApplication = false;
                        withinSupportsInput = false;
                        withinFeatureGroup = false;
                    } else if (depth < 3) {
                        if (withinActivity && isMainActivity) {
                            String8 aName(getComponentName(pkg, activityName));
                            if (isLauncherActivity) {
                                printf("launchable-activity:");
                                if (aName.length() > 0) {
                                    printf(" name='%s' ",
                                            ResTable::normalizeForOutput(aName.string()).string());
                                }
                                printf(" label='%s' icon='%s'\n",
                                        ResTable::normalizeForOutput(activityLabel.string()).string(),
                                        ResTable::normalizeForOutput(activityIcon.string()).string());
                            }
                            if (isLeanbackLauncherActivity) {
                                printf("leanback-launchable-activity:");
                                if (aName.length() > 0) {

//.........这里部分代码省略.........
            break;
        }
        if (argv[i][1] == '-' && argv[i][2] == 0) {
            ++i; // Skip --.
            break;
        }

        runtime.addOption(strdup(argv[i]));
        ALOGV("app_process main add option '%s'", argv[i]);
    }

    // Parse runtime arguments.  Stop at first unrecognized option.
    bool zygote = false;
    bool startSystemServer = false;
    bool application = false;
    String8 niceName;
    String8 className;

    ++i;  // Skip unused "parent dir" argument.
    while (i < argc) {
        const char* arg = argv[i++];
        if (strcmp(arg, "--zygote") == 0) {
            zygote = true;
            niceName = ZYGOTE_NICE_NAME;
        } else if (strcmp(arg, "--start-system-server") == 0) {
            startSystemServer = true;
        } else if (strcmp(arg, "--application") == 0) {
            application = true;
        } else if (strncmp(arg, "--nice-name=", 12) == 0) {
            niceName.setTo(arg + 12);
        } else if (strncmp(arg, "--", 2) != 0) {
            className.setTo(arg);
            break;
        } else {
            --i;
            break;
        }
    }

    Vector<String8> args;
    if (!className.isEmpty()) {
        // We're not in zygote mode, the only argument we need to pass
        // to RuntimeInit is the application argument.
        //
        // The Remainder of args get passed to startup class main(). Make
        // copies of them before we overwrite them with the process name.
        args.add(application ? String8("application") : String8("tool"));
        runtime.setClassNameAndArgs(className, argc - i, argv + i);

        if (!LOG_NDEBUG) {
          String8 restOfArgs;
          char* const* argv_new = argv + i;
          int argc_new = argc - i;
          for (int k = 0; k < argc_new; ++k) {
            restOfArgs.append("\"");
            restOfArgs.append(argv_new[k]);
            restOfArgs.append("\" ");
          }
          ALOGV("Class name = %s, args = %s", className.string(), restOfArgs.string());
        }
    } else {
        // We're in zygote mode.
        maybeCreateDalvikCache();

        if (startSystemServer) {
            args.add(String8("start-system-server"));
        }

        char prop[PROP_VALUE_MAX];
        if (property_get(ABI_LIST_PROPERTY, prop, NULL) == 0) {
            LOG_ALWAYS_FATAL("app_process: Unable to determine ABI list from property %s.",
                ABI_LIST_PROPERTY);
            return 11;
        }

        String8 abiFlag("--abi-list=");
        abiFlag.append(prop);
        args.add(abiFlag);

        // In zygote mode, pass all remaining arguments to the zygote
        // main() method.
        for (; i < argc; ++i) {
            args.add(String8(argv[i]));
        }
    }

    if (!niceName.isEmpty()) {
        runtime.setArgv0(niceName.string(), true /* setProcName */);
    }

    if (zygote) {
        runtime.start("com.android.internal.os.ZygoteInit", args, zygote);
    } else if (className) {
        runtime.start("com.android.internal.os.RuntimeInit", args, zygote);
    } else {
        fprintf(stderr, "Error: no class name or --zygote supplied.\n");
        app_usage();
        LOG_ALWAYS_FATAL("app_process: no class name or --zygote supplied.");
    }
}

//.........这里部分代码省略.........
#endif
                return true;
            }

            if (exact) {
                String8 absolutePath;
                absolutePath.appendFormat("%s/%s.so", search, pattern.string());
                if (!access(absolutePath.string(), R_OK)) {
                    result = absolutePath;
                    return true;
                }
                return false;
            }

            DIR* d = opendir(search);
            if (d != NULL) {
                struct dirent cur;
                struct dirent* e;
                while (readdir_r(d, &cur, &e) == 0 && e) {
                    if (e->d_type == DT_DIR) {
                        continue;
                    }
                    if (!strcmp(e->d_name, "libGLES_android.so")) {
                        // always skip the software renderer
                        continue;
                    }
                    if (strstr(e->d_name, pattern.string()) == e->d_name) {
                        if (!strcmp(e->d_name + strlen(e->d_name) - 3, ".so")) {
                            result.clear();
                            result.appendFormat("%s/%s", search, e->d_name);
                            closedir(d);
                            return true;
                        }
                    }
                }
                closedir(d);
            }
            return false;
        }
    };


    String8 absolutePath = MatchFile::find(kind);
    if (absolutePath.isEmpty()) {
        // this happens often, we don't want to log an error
        return 0;
    }
    const char* const driver_absolute_path = absolutePath.string();

    void* dso = dlopen(driver_absolute_path, RTLD_NOW | RTLD_LOCAL);
    if (dso == 0) {
        const char* err = dlerror();
        ALOGE("load_driver(%s): %s", driver_absolute_path, err?err:"unknown");
        return 0;
    }

    ALOGD("loaded %s", driver_absolute_path);

    if (mask & EGL) {
        getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress");

        ALOGE_IF(!getProcAddress,
                "can't find eglGetProcAddress() in %s", driver_absolute_path);

        egl_t* egl = &cnx->egl;
        __eglMustCastToProperFunctionPointerType* curr =
            (__eglMustCastToProperFunctionPointerType*)egl;
        char const * const * api = egl_names;
        while (*api) {
            char const * name = *api;
            __eglMustCastToProperFunctionPointerType f =
                (__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
            if (f == NULL) {
                // couldn't find the entry-point, use eglGetProcAddress()
                f = getProcAddress(name);
                if (f == NULL) {
                    f = (__eglMustCastToProperFunctionPointerType)0;
                }
            }
            *curr++ = f;
            api++;
        }
    }

    if (mask & GLESv1_CM) {
        init_api(dso, gl_names,
            (__eglMustCastToProperFunctionPointerType*)
                &cnx->hooks[egl_connection_t::GLESv1_INDEX]->gl,
            getProcAddress);
    }

    if (mask & GLESv2) {
      init_api(dso, gl_names,
            (__eglMustCastToProperFunctionPointerType*)
                &cnx->hooks[egl_connection_t::GLESv2_INDEX]->gl,
            getProcAddress);
    }

    return dso;
}

status_t VendorTagDescriptor::createFromParcel(const Parcel* parcel,
            /*out*/
            sp<VendorTagDescriptor>& descriptor) {
    status_t res = OK;
    if (parcel == NULL) {
        ALOGE("%s: parcel argument was NULL.", __FUNCTION__);
        return BAD_VALUE;
    }

    int32_t tagCount = 0;
    if ((res = parcel->readInt32(&tagCount)) != OK) {
        ALOGE("%s: could not read tag count from parcel", __FUNCTION__);
        return res;
    }

    if (tagCount < 0 || tagCount > INT32_MAX) {
        ALOGE("%s: tag count %d from vendor ops is invalid.", __FUNCTION__, tagCount);
        return BAD_VALUE;
    }

    sp<VendorTagDescriptor> desc = new VendorTagDescriptor();
    desc->mTagCount = tagCount;

    uint32_t tag, sectionIndex;
    uint32_t maxSectionIndex = 0;
    int32_t tagType;
    Vector<uint32_t> allTags;
    for (int32_t i = 0; i < tagCount; ++i) {
        if ((res = parcel->readInt32(reinterpret_cast<int32_t*>(&tag))) != OK) {
            ALOGE("%s: could not read tag id from parcel for index %d", __FUNCTION__, i);
            break;
        }
        if (tag < CAMERA_METADATA_VENDOR_TAG_BOUNDARY) {
            ALOGE("%s: vendor tag %d not in vendor tag section.", __FUNCTION__, tag);
            res = BAD_VALUE;
            break;
        }
        if ((res = parcel->readInt32(&tagType)) != OK) {
            ALOGE("%s: could not read tag type from parcel for tag %d", __FUNCTION__, tag);
            break;
        }
        if (tagType < 0 || tagType >= NUM_TYPES) {
            ALOGE("%s: tag type %d from vendor ops does not exist.", __FUNCTION__, tagType);
            res = BAD_VALUE;
            break;
        }
        String8 tagName = parcel->readString8();
        if (tagName.isEmpty()) {
            ALOGE("%s: parcel tag name was NULL for tag %d.", __FUNCTION__, tag);
            res = NOT_ENOUGH_DATA;
            break;
        }

        if ((res = parcel->readInt32(reinterpret_cast<int32_t*>(&sectionIndex))) != OK) {
            ALOGE("%s: could not read section index for tag %d.", __FUNCTION__, tag);
            break;
        }

        maxSectionIndex = (maxSectionIndex >= sectionIndex) ? maxSectionIndex : sectionIndex;

        allTags.add(tag);
        desc->mTagToNameMap.add(tag, tagName);
        desc->mTagToSectionMap.add(tag, sectionIndex);
        desc->mTagToTypeMap.add(tag, tagType);
    }

    if (res != OK) {
        return res;
    }

    size_t sectionCount;
    if (tagCount > 0) {
        if ((res = parcel->readInt32(reinterpret_cast<int32_t*>(&sectionCount))) != OK) {
            ALOGE("%s: could not read section count for.", __FUNCTION__);
            return res;
        }
        if (sectionCount < (maxSectionIndex + 1)) {
            ALOGE("%s: Incorrect number of sections defined, received %zu, needs %d.",
                    __FUNCTION__, sectionCount, (maxSectionIndex + 1));
            return BAD_VALUE;
        }
        LOG_ALWAYS_FATAL_IF(desc->mSections.setCapacity(sectionCount) <= 0,
                "Vector capacity must be positive");
        for (size_t i = 0; i < sectionCount; ++i) {
            String8 sectionName = parcel->readString8();
            if (sectionName.isEmpty()) {
                ALOGE("%s: parcel section name was NULL for section %zu.",
                      __FUNCTION__, i);
                return NOT_ENOUGH_DATA;
            }
            desc->mSections.add(sectionName);
        }
    }

    LOG_ALWAYS_FATAL_IF(static_cast<size_t>(tagCount) != allTags.size(),
                        "tagCount must be the same as allTags size");
    // Set up reverse mapping
    for (size_t i = 0; i < static_cast<size_t>(tagCount); ++i) {
        uint32_t tag = allTags[i];
        String8 sectionString = desc->mSections[desc->mTagToSectionMap.valueFor(tag)];
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        int64_t durationUs;
        if (trackMeta->findInt64(kKeyDuration, &durationUs)) {
            if (durationUs > maxDurationUs) {
                maxDurationUs = durationUs;
            }
        }

        const char *mime;
        if (trackMeta->findCString(kKeyMIMEType, &mime)) {
            if (!hasAudio && !strncasecmp("audio/", mime, 6)) {
                hasAudio = true;

                if (!trackMeta->findInt32(kKeyBitRate, &audioBitrate)) {
                    audioBitrate = -1;
                }
            } else if (!hasVideo && !strncasecmp("video/", mime, 6)) {
                hasVideo = true;

                CHECK(trackMeta->findInt32(kKeyWidth, &videoWidth));
                CHECK(trackMeta->findInt32(kKeyHeight, &videoHeight));
                if (!trackMeta->findInt32(kKeyRotation, &rotationAngle)) {
                    rotationAngle = 0;
                }
            } else if (!strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP)) {
                const char *lang;
                bool success = trackMeta->findCString(kKeyMediaLanguage, &lang);
                if (success) {
                    timedTextLang.append(String8(lang));
                    timedTextLang.append(String8(":"));
                } else {
                    ALOGE("No language found for timed text");
                }
            }
        }
    }

    // To save the language codes for all timed text tracks
    // If multiple text tracks present, the format will look
    // like "eng:chi"
    if (!timedTextLang.isEmpty()) {
        mMetaData.add(METADATA_KEY_TIMED_TEXT_LANGUAGES, timedTextLang);
    }

    // The duration value is a string representing the duration in ms.
    sprintf(tmp, "%lld", (maxDurationUs + 500) / 1000);
    mMetaData.add(METADATA_KEY_DURATION, String8(tmp));

    if (hasAudio) {
        mMetaData.add(METADATA_KEY_HAS_AUDIO, String8("yes"));
    }

    if (hasVideo) {
        mMetaData.add(METADATA_KEY_HAS_VIDEO, String8("yes"));

        sprintf(tmp, "%d", videoWidth);
        mMetaData.add(METADATA_KEY_VIDEO_WIDTH, String8(tmp));

        sprintf(tmp, "%d", videoHeight);
        mMetaData.add(METADATA_KEY_VIDEO_HEIGHT, String8(tmp));

        sprintf(tmp, "%d", rotationAngle);
        mMetaData.add(METADATA_KEY_VIDEO_ROTATION, String8(tmp));
    }

    if (numTracks == 1 && hasAudio && audioBitrate >= 0) {
        sprintf(tmp, "%d", audioBitrate);
        mMetaData.add(METADATA_KEY_BITRATE, String8(tmp));
    } else {
        off64_t sourceSize;
        if (mSource->getSize(&sourceSize) == OK) {
            int64_t avgBitRate = (int64_t)(sourceSize * 8E6 / maxDurationUs);

            sprintf(tmp, "%lld", avgBitRate);
            mMetaData.add(METADATA_KEY_BITRATE, String8(tmp));
        }
    }

    if (numTracks == 1) {
        const char *fileMIME;
        CHECK(meta->findCString(kKeyMIMEType, &fileMIME));

        if (!strcasecmp(fileMIME, "video/x-matroska")) {
            sp<MetaData> trackMeta = mExtractor->getTrackMetaData(0);
            const char *trackMIME;
            CHECK(trackMeta->findCString(kKeyMIMEType, &trackMIME));

            if (!strncasecmp("audio/", trackMIME, 6)) {
                // The matroska file only contains a single audio track,
                // rewrite its mime type.
                mMetaData.add(
                        METADATA_KEY_MIMETYPE, String8("audio/x-matroska"));
            }
        }
    }

    // To check whether the media file is drm-protected
    if (mExtractor->getDrmFlag()) {
        mMetaData.add(METADATA_KEY_IS_DRM, String8("1"));
    }
}