DataSource.cpp revision deeb96121e9d67ee4c0701c88d5b5cfadc4541b2 
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#include "include/DRMExtractor.h"
26
27#include "matroska/MatroskaExtractor.h"
28
29#include <media/stagefright/foundation/AMessage.h>
30#include <media/stagefright/DataSource.h>
31#include <media/stagefright/FileSource.h>
32#include <media/stagefright/MediaErrors.h>
33#include <utils/String8.h>
34
35namespace android {
36
37bool DataSource::getUInt16(off_t offset, uint16_t *x) {
38    *x = 0;
39
40    uint8_t byte[2];
41    if (readAt(offset, byte, 2) != 2) {
42        return false;
43    }
44
45    *x = (byte[0] << 8) | byte[1];
46
47    return true;
48}
49
50status_t DataSource::getSize(off_t *size) {
51    *size = 0;
52
53    return ERROR_UNSUPPORTED;
54}
55
56////////////////////////////////////////////////////////////////////////////////
57
58Mutex DataSource::gSnifferMutex;
59List<DataSource::SnifferFunc> DataSource::gSniffers;
60
61bool DataSource::sniff(
62        String8 *mimeType, float *confidence, sp<AMessage> *meta) {
63    *mimeType = "";
64    *confidence = 0.0f;
65    meta->clear();
66
67    Mutex::Autolock autoLock(gSnifferMutex);
68    for (List<SnifferFunc>::iterator it = gSniffers.begin();
69         it != gSniffers.end(); ++it) {
70        String8 newMimeType;
71        float newConfidence;
72        sp<AMessage> newMeta;
73        if ((*it)(this, &newMimeType, &newConfidence, &newMeta)) {
74            if (newConfidence > *confidence) {
75                *mimeType = newMimeType;
76                *confidence = newConfidence;
77                *meta = newMeta;
78            }
79        }
80    }
81
82    return *confidence > 0.0;
83}
84
85// static
86void DataSource::RegisterSniffer(SnifferFunc func) {
87    Mutex::Autolock autoLock(gSnifferMutex);
88
89    for (List<SnifferFunc>::iterator it = gSniffers.begin();
90         it != gSniffers.end(); ++it) {
91        if (*it == func) {
92            return;
93        }
94    }
95
96    gSniffers.push_back(func);
97}
98
99// static
100void DataSource::RegisterDefaultSniffers() {
101    RegisterSniffer(SniffMPEG4);
102    RegisterSniffer(SniffMatroska);
103    RegisterSniffer(SniffOgg);
104    RegisterSniffer(SniffWAV);
105    RegisterSniffer(SniffAMR);
106    RegisterSniffer(SniffMPEG2TS);
107    RegisterSniffer(SniffMP3);
108    //RegisterSniffer(SniffDRM);
109}
110
111// static
112sp<DataSource> DataSource::CreateFromURI(
113        const char *uri, const KeyedVector<String8, String8> *headers) {
114    sp<DataSource> source;
115    if (!strncasecmp("file://", uri, 7)) {
116        source = new FileSource(uri + 7);
117    } else if (!strncasecmp("http://", uri, 7)) {
118        sp<NuHTTPDataSource> httpSource = new NuHTTPDataSource;
119        if (httpSource->connect(uri, headers) != OK) {
120            return NULL;
121        }
122        source = new NuCachedSource2(httpSource);
123    } else {
124        // Assume it's a filename.
125        source = new FileSource(uri);
126    }
127
128    if (source == NULL || source->initCheck() != OK) {
129        return NULL;
130    }
131
132    return source;
133}
134
135}  // namespace android
136