DataSource.cpp revision 5a1c3529e4fa2f8a11054181294e0ce79fff8dd3 
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/foundation/AMessage.h>
29#include <media/stagefright/DataSource.h>
30#include <media/stagefright/FileSource.h>
31#include <media/stagefright/MediaErrors.h>
32#include <utils/String8.h>
33
34namespace android {
35
36bool DataSource::getUInt16(off_t offset, uint16_t *x) {
37    *x = 0;
38
39    uint8_t byte[2];
40    if (readAt(offset, byte, 2) != 2) {
41        return false;
42    }
43
44    *x = (byte[0] << 8) | byte[1];
45
46    return true;
47}
48
49status_t DataSource::getSize(off_t *size) {
50    *size = 0;
51
52    return ERROR_UNSUPPORTED;
53}
54
55////////////////////////////////////////////////////////////////////////////////
56
57Mutex DataSource::gSnifferMutex;
58List<DataSource::SnifferFunc> DataSource::gSniffers;
59
60bool DataSource::sniff(
61        String8 *mimeType, float *confidence, sp<AMessage> *meta) {
62    *mimeType = "";
63    *confidence = 0.0f;
64    meta->clear();
65
66    Mutex::Autolock autoLock(gSnifferMutex);
67    for (List<SnifferFunc>::iterator it = gSniffers.begin();
68         it != gSniffers.end(); ++it) {
69        String8 newMimeType;
70        float newConfidence;
71        sp<AMessage> newMeta;
72        if ((*it)(this, &newMimeType, &newConfidence, &newMeta)) {
73            if (newConfidence > *confidence) {
74                *mimeType = newMimeType;
75                *confidence = newConfidence;
76                *meta = newMeta;
77            }
78        }
79    }
80
81    return *confidence > 0.0;
82}
83
84// static
85void DataSource::RegisterSniffer(SnifferFunc func) {
86    Mutex::Autolock autoLock(gSnifferMutex);
87
88    for (List<SnifferFunc>::iterator it = gSniffers.begin();
89         it != gSniffers.end(); ++it) {
90        if (*it == func) {
91            return;
92        }
93    }
94
95    gSniffers.push_back(func);
96}
97
98// static
99void DataSource::RegisterDefaultSniffers() {
100    RegisterSniffer(SniffMPEG4);
101    RegisterSniffer(SniffMatroska);
102    RegisterSniffer(SniffOgg);
103    RegisterSniffer(SniffWAV);
104    RegisterSniffer(SniffAMR);
105    RegisterSniffer(SniffMPEG2TS);
106    RegisterSniffer(SniffMP3);
107}
108
109// static
110sp<DataSource> DataSource::CreateFromURI(
111        const char *uri, const KeyedVector<String8, String8> *headers) {
112    sp<DataSource> source;
113    if (!strncasecmp("file://", uri, 7)) {
114        source = new FileSource(uri + 7);
115    } else if (!strncasecmp("http://", uri, 7)) {
116        sp<NuHTTPDataSource> httpSource = new NuHTTPDataSource;
117        if (httpSource->connect(uri, headers) != OK) {
118            return NULL;
119        }
120        source = new NuCachedSource2(httpSource);
121    } else {
122        // Assume it's a filename.
123        source = new FileSource(uri);
124    }
125
126    if (source == NULL || source->initCheck() != OK) {
127        return NULL;
128    }
129
130    return source;
131}
132
133}  // namespace android
134