DataSource.cpp revision a89082944308805b0def7de87c67e370e74b8789 
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
35#include <cutils/properties.h>
36
37namespace android {
38
39bool DataSource::getUInt16(off_t offset, uint16_t *x) {
40    *x = 0;
41
42    uint8_t byte[2];
43    if (readAt(offset, byte, 2) != 2) {
44        return false;
45    }
46
47    *x = (byte[0] << 8) | byte[1];
48
49    return true;
50}
51
52status_t DataSource::getSize(off_t *size) {
53    *size = 0;
54
55    return ERROR_UNSUPPORTED;
56}
57
58////////////////////////////////////////////////////////////////////////////////
59
60Mutex DataSource::gSnifferMutex;
61List<DataSource::SnifferFunc> DataSource::gSniffers;
62
63bool DataSource::sniff(
64        String8 *mimeType, float *confidence, sp<AMessage> *meta) {
65    *mimeType = "";
66    *confidence = 0.0f;
67    meta->clear();
68
69    Mutex::Autolock autoLock(gSnifferMutex);
70    for (List<SnifferFunc>::iterator it = gSniffers.begin();
71         it != gSniffers.end(); ++it) {
72        String8 newMimeType;
73        float newConfidence;
74        sp<AMessage> newMeta;
75        if ((*it)(this, &newMimeType, &newConfidence, &newMeta)) {
76            if (newConfidence > *confidence) {
77                *mimeType = newMimeType;
78                *confidence = newConfidence;
79                *meta = newMeta;
80            }
81        }
82    }
83
84    return *confidence > 0.0;
85}
86
87// static
88void DataSource::RegisterSniffer(SnifferFunc func) {
89    Mutex::Autolock autoLock(gSnifferMutex);
90
91    for (List<SnifferFunc>::iterator it = gSniffers.begin();
92         it != gSniffers.end(); ++it) {
93        if (*it == func) {
94            return;
95        }
96    }
97
98    gSniffers.push_back(func);
99}
100
101// static
102void DataSource::RegisterDefaultSniffers() {
103    RegisterSniffer(SniffMPEG4);
104    RegisterSniffer(SniffMatroska);
105    RegisterSniffer(SniffOgg);
106    RegisterSniffer(SniffWAV);
107    RegisterSniffer(SniffAMR);
108    RegisterSniffer(SniffMPEG2TS);
109    RegisterSniffer(SniffMP3);
110
111    char value[PROPERTY_VALUE_MAX];
112    if (property_get("drm.service.enabled", value, NULL)
113            && (!strcmp(value, "1") || !strcasecmp(value, "true"))) {
114        RegisterSniffer(SniffDRM);
115    }
116}
117
118// static
119sp<DataSource> DataSource::CreateFromURI(
120        const char *uri, const KeyedVector<String8, String8> *headers) {
121    sp<DataSource> source;
122    if (!strncasecmp("file://", uri, 7)) {
123        source = new FileSource(uri + 7);
124    } else if (!strncasecmp("http://", uri, 7)) {
125        sp<NuHTTPDataSource> httpSource = new NuHTTPDataSource;
126        if (httpSource->connect(uri, headers) != OK) {
127            return NULL;
128        }
129        source = new NuCachedSource2(httpSource);
130    } else {
131        // Assume it's a filename.
132        source = new FileSource(uri);
133    }
134
135    if (source == NULL || source->initCheck() != OK) {
136        return NULL;
137    }
138
139    return source;
140}
141
142}  // namespace android
143