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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 
     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 
     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 
     72     virtual uint32_t flags() {
     73         return 0;
     74     }
     75 
     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     }
     97     virtual void getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {};
     98 
     99     virtual String8 getUri() {
    100         return String8();
    101     }
    102 
    103     virtual String8 getMIMEType() const;
    104 
    105 protected:
    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