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      1 /*
      2  * Copyright (C) 2009 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 //#define LOG_NDEBUG 0
     17 #define LOG_TAG "DataSource"
     18 
     19 #include "include/AMRExtractor.h"
     20 
     21 #include "include/AACExtractor.h"
     22 #include "include/CallbackDataSource.h"
     23 #include "include/DRMExtractor.h"
     24 #include "include/FLACExtractor.h"
     25 #include "include/HTTPBase.h"
     26 #include "include/MidiExtractor.h"
     27 #include "include/MP3Extractor.h"
     28 #include "include/MPEG2PSExtractor.h"
     29 #include "include/MPEG2TSExtractor.h"
     30 #include "include/MPEG4Extractor.h"
     31 #include "include/NuCachedSource2.h"
     32 #include "include/OggExtractor.h"
     33 #include "include/WAVExtractor.h"
     34 #include "include/WVMExtractor.h"
     35 
     36 #include "matroska/MatroskaExtractor.h"
     37 
     38 #include <media/IMediaHTTPConnection.h>
     39 #include <media/IMediaHTTPService.h>
     40 #include <media/stagefright/foundation/ADebug.h>
     41 #include <media/stagefright/foundation/AMessage.h>
     42 #include <media/stagefright/DataSource.h>
     43 #include <media/stagefright/DataURISource.h>
     44 #include <media/stagefright/FileSource.h>
     45 #include <media/stagefright/MediaErrors.h>
     46 #include <media/stagefright/MediaHTTP.h>
     47 #include <utils/String8.h>
     48 
     49 #include <cutils/properties.h>
     50 
     51 namespace android {
     52 
     53 bool DataSource::getUInt16(off64_t offset, uint16_t *x) {
     54     *x = 0;
     55 
     56     uint8_t byte[2];
     57     if (readAt(offset, byte, 2) != 2) {
     58         return false;
     59     }
     60 
     61     *x = (byte[0] << 8) | byte[1];
     62 
     63     return true;
     64 }
     65 
     66 bool DataSource::getUInt24(off64_t offset, uint32_t *x) {
     67     *x = 0;
     68 
     69     uint8_t byte[3];
     70     if (readAt(offset, byte, 3) != 3) {
     71         return false;
     72     }
     73 
     74     *x = (byte[0] << 16) | (byte[1] << 8) | byte[2];
     75 
     76     return true;
     77 }
     78 
     79 bool DataSource::getUInt32(off64_t offset, uint32_t *x) {
     80     *x = 0;
     81 
     82     uint32_t tmp;
     83     if (readAt(offset, &tmp, 4) != 4) {
     84         return false;
     85     }
     86 
     87     *x = ntohl(tmp);
     88 
     89     return true;
     90 }
     91 
     92 bool DataSource::getUInt64(off64_t offset, uint64_t *x) {
     93     *x = 0;
     94 
     95     uint64_t tmp;
     96     if (readAt(offset, &tmp, 8) != 8) {
     97         return false;
     98     }
     99 
    100     *x = ntoh64(tmp);
    101 
    102     return true;
    103 }
    104 
    105 status_t DataSource::getSize(off64_t *size) {
    106     *size = 0;
    107 
    108     return ERROR_UNSUPPORTED;
    109 }
    110 
    111 ////////////////////////////////////////////////////////////////////////////////
    112 
    113 Mutex DataSource::gSnifferMutex;
    114 List<DataSource::SnifferFunc> DataSource::gSniffers;
    115 bool DataSource::gSniffersRegistered = false;
    116 
    117 bool DataSource::sniff(
    118         String8 *mimeType, float *confidence, sp<AMessage> *meta) {
    119     *mimeType = "";
    120     *confidence = 0.0f;
    121     meta->clear();
    122 
    123     {
    124         Mutex::Autolock autoLock(gSnifferMutex);
    125         if (!gSniffersRegistered) {
    126             return false;
    127         }
    128     }
    129 
    130     for (List<SnifferFunc>::iterator it = gSniffers.begin();
    131          it != gSniffers.end(); ++it) {
    132         String8 newMimeType;
    133         float newConfidence;
    134         sp<AMessage> newMeta;
    135         if ((*it)(this, &newMimeType, &newConfidence, &newMeta)) {
    136             if (newConfidence > *confidence) {
    137                 *mimeType = newMimeType;
    138                 *confidence = newConfidence;
    139                 *meta = newMeta;
    140             }
    141         }
    142     }
    143 
    144     return *confidence > 0.0;
    145 }
    146 
    147 // static
    148 void DataSource::RegisterSniffer_l(SnifferFunc func) {
    149     for (List<SnifferFunc>::iterator it = gSniffers.begin();
    150          it != gSniffers.end(); ++it) {
    151         if (*it == func) {
    152             return;
    153         }
    154     }
    155 
    156     gSniffers.push_back(func);
    157 }
    158 
    159 // static
    160 void DataSource::RegisterDefaultSniffers() {
    161     Mutex::Autolock autoLock(gSnifferMutex);
    162     if (gSniffersRegistered) {
    163         return;
    164     }
    165 
    166     RegisterSniffer_l(SniffMPEG4);
    167     RegisterSniffer_l(SniffMatroska);
    168     RegisterSniffer_l(SniffOgg);
    169     RegisterSniffer_l(SniffWAV);
    170     RegisterSniffer_l(SniffFLAC);
    171     RegisterSniffer_l(SniffAMR);
    172     RegisterSniffer_l(SniffMPEG2TS);
    173     RegisterSniffer_l(SniffMP3);
    174     RegisterSniffer_l(SniffAAC);
    175     RegisterSniffer_l(SniffMPEG2PS);
    176     RegisterSniffer_l(SniffWVM);
    177     RegisterSniffer_l(SniffMidi);
    178 
    179     char value[PROPERTY_VALUE_MAX];
    180     if (property_get("drm.service.enabled", value, NULL)
    181             && (!strcmp(value, "1") || !strcasecmp(value, "true"))) {
    182         RegisterSniffer_l(SniffDRM);
    183     }
    184     gSniffersRegistered = true;
    185 }
    186 
    187 // static
    188 sp<DataSource> DataSource::CreateFromURI(
    189         const sp<IMediaHTTPService> &httpService,
    190         const char *uri,
    191         const KeyedVector<String8, String8> *headers,
    192         String8 *contentType,
    193         HTTPBase *httpSource) {
    194     if (contentType != NULL) {
    195         *contentType = "";
    196     }
    197 
    198     bool isWidevine = !strncasecmp("widevine://", uri, 11);
    199 
    200     sp<DataSource> source;
    201     if (!strncasecmp("file://", uri, 7)) {
    202         source = new FileSource(uri + 7);
    203     } else if (!strncasecmp("http://", uri, 7)
    204             || !strncasecmp("https://", uri, 8)
    205             || isWidevine) {
    206         if (httpService == NULL) {
    207             ALOGE("Invalid http service!");
    208             return NULL;
    209         }
    210 
    211         if (httpSource == NULL) {
    212             sp<IMediaHTTPConnection> conn = httpService->makeHTTPConnection();
    213             if (conn == NULL) {
    214                 ALOGE("Failed to make http connection from http service!");
    215                 return NULL;
    216             }
    217             httpSource = new MediaHTTP(conn);
    218         }
    219 
    220         String8 tmp;
    221         if (isWidevine) {
    222             tmp = String8("http://");
    223             tmp.append(uri + 11);
    224 
    225             uri = tmp.string();
    226         }
    227 
    228         String8 cacheConfig;
    229         bool disconnectAtHighwatermark;
    230         KeyedVector<String8, String8> nonCacheSpecificHeaders;
    231         if (headers != NULL) {
    232             nonCacheSpecificHeaders = *headers;
    233             NuCachedSource2::RemoveCacheSpecificHeaders(
    234                     &nonCacheSpecificHeaders,
    235                     &cacheConfig,
    236                     &disconnectAtHighwatermark);
    237         }
    238 
    239         if (httpSource->connect(uri, &nonCacheSpecificHeaders) != OK) {
    240             ALOGE("Failed to connect http source!");
    241             return NULL;
    242         }
    243 
    244         if (!isWidevine) {
    245             if (contentType != NULL) {
    246                 *contentType = httpSource->getMIMEType();
    247             }
    248 
    249             source = new NuCachedSource2(
    250                     httpSource,
    251                     cacheConfig.isEmpty() ? NULL : cacheConfig.string(),
    252                     disconnectAtHighwatermark);
    253         } else {
    254             // We do not want that prefetching, caching, datasource wrapper
    255             // in the widevine:// case.
    256             source = httpSource;
    257         }
    258     } else if (!strncasecmp("data:", uri, 5)) {
    259         source = DataURISource::Create(uri);
    260     } else {
    261         // Assume it's a filename.
    262         source = new FileSource(uri);
    263     }
    264 
    265     if (source == NULL || source->initCheck() != OK) {
    266         return NULL;
    267     }
    268 
    269     return source;
    270 }
    271 
    272 sp<DataSource> DataSource::CreateMediaHTTP(const sp<IMediaHTTPService> &httpService) {
    273     if (httpService == NULL) {
    274         return NULL;
    275     }
    276 
    277     sp<IMediaHTTPConnection> conn = httpService->makeHTTPConnection();
    278     if (conn == NULL) {
    279         return NULL;
    280     } else {
    281         return new MediaHTTP(conn);
    282     }
    283 }
    284 
    285 sp<DataSource> DataSource::CreateFromIDataSource(const sp<IDataSource> &source) {
    286     return new TinyCacheSource(new CallbackDataSource(source));
    287 }
    288 
    289 String8 DataSource::getMIMEType() const {
    290     return String8("application/octet-stream");
    291 }
    292 
    293 }  // namespace android
    294