DataSource.h revision dcd25efb46c41c8d24a0a9cf61fb57f84149709e 
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 <utils/Errors.h>
24#include <utils/KeyedVector.h>
25#include <utils/List.h>
26#include <utils/RefBase.h>
27#include <utils/threads.h>
28#include <drm/DrmManagerClient.h>
29
30namespace android {
31
32class String8;
33
34class DataSource : public RefBase {
35public:
36    enum Flags {
37        kWantsPrefetching      = 1,
38        kStreamedFromLocalHost = 2,
39    };
40
41    static sp<DataSource> CreateFromURI(
42            const char *uri,
43            const KeyedVector<String8, String8> *headers = NULL);
44
45    DataSource() {}
46
47    virtual status_t initCheck() const = 0;
48
49    virtual ssize_t readAt(off_t offset, void *data, size_t size) = 0;
50
51    // Convenience methods:
52    bool getUInt16(off_t offset, uint16_t *x);
53
54    // May return ERROR_UNSUPPORTED.
55    virtual status_t getSize(off_t *size);
56
57    virtual uint32_t flags() {
58        return 0;
59    }
60
61    ////////////////////////////////////////////////////////////////////////////
62
63    bool sniff(String8 *mimeType, float *confidence);
64
65    typedef bool (*SnifferFunc)(
66            const sp<DataSource> &source, String8 *mimeType, float *confidence);
67
68    static void RegisterSniffer(SnifferFunc func);
69    static void RegisterDefaultSniffers();
70
71    // for DRM
72    virtual DecryptHandle* DrmInitialization(DrmManagerClient *client) {
73        return NULL;
74    }
75    virtual void getDrmInfo(DecryptHandle **handle, DrmManagerClient **client) {};
76
77
78protected:
79    virtual ~DataSource() {}
80
81private:
82    static Mutex gSnifferMutex;
83    static List<SnifferFunc> gSniffers;
84
85    DataSource(const DataSource &);
86    DataSource &operator=(const DataSource &);
87};
88
89}  // namespace android
90
91#endif  // DATA_SOURCE_H_
92