DataSource.cpp revision 79f77ef3b0a37660ba8c5bcb2dfbfda3860f2135 
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#include "include/AMRExtractor.h"
18#include "include/MP3Extractor.h"
19#include "include/MPEG4Extractor.h"
20#include "include/WAVExtractor.h"
21#include "include/OggExtractor.h"
22#include "include/MPEG2TSExtractor.h"
23#include "include/NuCachedSource2.h"
24#include "include/NuHTTPDataSource.h"
25
26#include "matroska/MatroskaExtractor.h"
27
28#include <media/stagefright/DataSource.h>
29#include <media/stagefright/FileSource.h>
30#include <media/stagefright/MediaErrors.h>
31#include <utils/String8.h>
32
33namespace android {
34
35bool DataSource::getUInt16(off_t offset, uint16_t *x) {
36    *x = 0;
37
38    uint8_t byte[2];
39    if (readAt(offset, byte, 2) != 2) {
40        return false;
41    }
42
43    *x = (byte[0] << 8) | byte[1];
44
45    return true;
46}
47
48status_t DataSource::getSize(off_t *size) {
49    *size = 0;
50
51    return ERROR_UNSUPPORTED;
52}
53
54////////////////////////////////////////////////////////////////////////////////
55
56Mutex DataSource::gSnifferMutex;
57List<DataSource::SnifferFunc> DataSource::gSniffers;
58
59bool DataSource::sniff(String8 *mimeType, float *confidence) {
60    *mimeType = "";
61    *confidence = 0.0f;
62
63    Mutex::Autolock autoLock(gSnifferMutex);
64    for (List<SnifferFunc>::iterator it = gSniffers.begin();
65         it != gSniffers.end(); ++it) {
66        String8 newMimeType;
67        float newConfidence;
68        if ((*it)(this, &newMimeType, &newConfidence)) {
69            if (newConfidence > *confidence) {
70                *mimeType = newMimeType;
71                *confidence = newConfidence;
72            }
73        }
74    }
75
76    return *confidence > 0.0;
77}
78
79// static
80void DataSource::RegisterSniffer(SnifferFunc func) {
81    Mutex::Autolock autoLock(gSnifferMutex);
82
83    for (List<SnifferFunc>::iterator it = gSniffers.begin();
84         it != gSniffers.end(); ++it) {
85        if (*it == func) {
86            return;
87        }
88    }
89
90    gSniffers.push_back(func);
91}
92
93// static
94void DataSource::RegisterDefaultSniffers() {
95    RegisterSniffer(SniffMP3);
96    RegisterSniffer(SniffMPEG4);
97    RegisterSniffer(SniffAMR);
98    RegisterSniffer(SniffWAV);
99    RegisterSniffer(SniffOgg);
100    RegisterSniffer(SniffMatroska);
101    RegisterSniffer(SniffMPEG2TS);
102}
103
104// static
105sp<DataSource> DataSource::CreateFromURI(
106        const char *uri, const KeyedVector<String8, String8> *headers) {
107    sp<DataSource> source;
108    if (!strncasecmp("file://", uri, 7)) {
109        source = new FileSource(uri + 7);
110    } else if (!strncasecmp("http://", uri, 7)) {
111        sp<NuHTTPDataSource> httpSource = new NuHTTPDataSource;
112        if (httpSource->connect(uri, headers) != OK) {
113            return NULL;
114        }
115        source = new NuCachedSource2(httpSource);
116    } else {
117        // Assume it's a filename.
118        source = new FileSource(uri);
119    }
120
121    if (source == NULL || source->initCheck() != OK) {
122        return NULL;
123    }
124
125    return source;
126}
127
128}  // namespace android
129