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 17 #ifndef DATA_SOURCE_H_ 18 19 #define DATA_SOURCE_H_ 20 21 #include <sys/types.h> 22 23 #include <media/stagefright/MediaErrors.h> 24 #include <utils/Errors.h> 25 #include <utils/KeyedVector.h> 26 #include <utils/List.h> 27 #include <utils/RefBase.h> 28 #include <utils/threads.h> 29 #include <drm/DrmManagerClient.h> 30 31 namespace android { 32 33 struct AMessage; 34 struct AString; 35 struct IMediaHTTPService; 36 class String8; 37 struct HTTPBase; 38 39 class DataSource : public RefBase { 40 public: 41 enum Flags { 42 kWantsPrefetching = 1, 43 kStreamedFromLocalHost = 2, 44 kIsCachingDataSource = 4, 45 kIsHTTPBasedSource = 8, 46 }; 47 48 static sp<DataSource> CreateFromURI( 49 const sp<IMediaHTTPService> &httpService, 50 const char *uri, 51 const KeyedVector<String8, String8> *headers = NULL, 52 String8 *contentType = NULL, 53 HTTPBase *httpSource = NULL); 54 55 static sp<DataSource> CreateMediaHTTP(const sp<IMediaHTTPService> &httpService); 56 DataSource()57 DataSource() {} 58 59 virtual status_t initCheck() const = 0; 60 61 virtual ssize_t readAt(off64_t offset, void *data, size_t size) = 0; 62 63 // Convenience methods: 64 bool getUInt16(off64_t offset, uint16_t *x); 65 bool getUInt24(off64_t offset, uint32_t *x); // 3 byte int, returned as a 32-bit int 66 bool getUInt32(off64_t offset, uint32_t *x); 67 bool getUInt64(off64_t offset, uint64_t *x); 68 69 // May return ERROR_UNSUPPORTED. 70 virtual status_t getSize(off64_t *size); 71 flags()72 virtual uint32_t flags() { 73 return 0; 74 } 75 reconnectAtOffset(off64_t offset)76 virtual status_t reconnectAtOffset(off64_t offset) { 77 return ERROR_UNSUPPORTED; 78 } 79 80 //////////////////////////////////////////////////////////////////////////// 81 82 bool sniff(String8 *mimeType, float *confidence, sp<AMessage> *meta); 83 84 // The sniffer can optionally fill in "meta" with an AMessage containing 85 // a dictionary of values that helps the corresponding extractor initialize 86 // its state without duplicating effort already exerted by the sniffer. 87 typedef bool (*SnifferFunc)( 88 const sp<DataSource> &source, String8 *mimeType, 89 float *confidence, sp<AMessage> *meta); 90 91 static void RegisterDefaultSniffers(); 92 93 // for DRM 94 virtual sp<DecryptHandle> DrmInitialization(const char *mime = NULL) { 95 return NULL; 96 } getDrmInfo(sp<DecryptHandle> & handle,DrmManagerClient ** client)97 virtual void getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {}; 98 getUri()99 virtual String8 getUri() { 100 return String8(); 101 } 102 103 virtual String8 getMIMEType() const; 104 105 protected: ~DataSource()106 virtual ~DataSource() {} 107 108 private: 109 static Mutex gSnifferMutex; 110 static List<SnifferFunc> gSniffers; 111 static bool gSniffersRegistered; 112 113 static void RegisterSniffer_l(SnifferFunc func); 114 115 DataSource(const DataSource &); 116 DataSource &operator=(const DataSource &); 117 }; 118 119 } // namespace android 120 121 #endif // DATA_SOURCE_H_ 122