DataSource.cpp revision 4bbfff2dbf3968c267c3b2ea9f8912a38372a9da 
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
19#include "include/AACExtractor.h"
20#include "include/DRMExtractor.h"
21#include "include/FLACExtractor.h"
22#include "include/HTTPBase.h"
23#include "include/MP3Extractor.h"
24#include "include/MPEG2PSExtractor.h"
25#include "include/MPEG2TSExtractor.h"
26#include "include/MPEG4Extractor.h"
27#include "include/NuCachedSource2.h"
28#include "include/OggExtractor.h"
29#include "include/WAVExtractor.h"
30#include "include/WVMExtractor.h"
31
32#include "matroska/MatroskaExtractor.h"
33
34#include <media/IMediaHTTPConnection.h>
35#include <media/IMediaHTTPService.h>
36#include <media/stagefright/foundation/AMessage.h>
37#include <media/stagefright/DataSource.h>
38#include <media/stagefright/DataURISource.h>
39#include <media/stagefright/FileSource.h>
40#include <media/stagefright/MediaErrors.h>
41#include <media/stagefright/MediaHTTP.h>
42#include <utils/String8.h>
43
44#include <cutils/properties.h>
45
46namespace android {
47
48bool DataSource::getUInt16(off64_t offset, uint16_t *x) {
49    *x = 0;
50
51    uint8_t byte[2];
52    if (readAt(offset, byte, 2) != 2) {
53        return false;
54    }
55
56    *x = (byte[0] << 8) | byte[1];
57
58    return true;
59}
60
61bool DataSource::getUInt24(off64_t offset, uint32_t *x) {
62    *x = 0;
63
64    uint8_t byte[3];
65    if (readAt(offset, byte, 3) != 3) {
66        return false;
67    }
68
69    *x = (byte[0] << 16) | (byte[1] << 8) | byte[2];
70
71    return true;
72}
73
74bool DataSource::getUInt32(off64_t offset, uint32_t *x) {
75    *x = 0;
76
77    uint32_t tmp;
78    if (readAt(offset, &tmp, 4) != 4) {
79        return false;
80    }
81
82    *x = ntohl(tmp);
83
84    return true;
85}
86
87bool DataSource::getUInt64(off64_t offset, uint64_t *x) {
88    *x = 0;
89
90    uint64_t tmp;
91    if (readAt(offset, &tmp, 8) != 8) {
92        return false;
93    }
94
95    *x = ntoh64(tmp);
96
97    return true;
98}
99
100status_t DataSource::getSize(off64_t *size) {
101    *size = 0;
102
103    return ERROR_UNSUPPORTED;
104}
105
106////////////////////////////////////////////////////////////////////////////////
107
108Mutex DataSource::gSnifferMutex;
109List<DataSource::SnifferFunc> DataSource::gSniffers;
110bool DataSource::gSniffersRegistered = false;
111
112bool DataSource::sniff(
113        String8 *mimeType, float *confidence, sp<AMessage> *meta) {
114    *mimeType = "";
115    *confidence = 0.0f;
116    meta->clear();
117
118    {
119        Mutex::Autolock autoLock(gSnifferMutex);
120        if (!gSniffersRegistered) {
121            return false;
122        }
123    }
124
125    for (List<SnifferFunc>::iterator it = gSniffers.begin();
126         it != gSniffers.end(); ++it) {
127        String8 newMimeType;
128        float newConfidence;
129        sp<AMessage> newMeta;
130        if ((*it)(this, &newMimeType, &newConfidence, &newMeta)) {
131            if (newConfidence > *confidence) {
132                *mimeType = newMimeType;
133                *confidence = newConfidence;
134                *meta = newMeta;
135            }
136        }
137    }
138
139    return *confidence > 0.0;
140}
141
142// static
143void DataSource::RegisterSniffer_l(SnifferFunc func) {
144    for (List<SnifferFunc>::iterator it = gSniffers.begin();
145         it != gSniffers.end(); ++it) {
146        if (*it == func) {
147            return;
148        }
149    }
150
151    gSniffers.push_back(func);
152}
153
154// static
155void DataSource::RegisterDefaultSniffers() {
156    Mutex::Autolock autoLock(gSnifferMutex);
157    if (gSniffersRegistered) {
158        return;
159    }
160
161    RegisterSniffer_l(SniffMPEG4);
162    RegisterSniffer_l(SniffMatroska);
163    RegisterSniffer_l(SniffOgg);
164    RegisterSniffer_l(SniffWAV);
165    RegisterSniffer_l(SniffFLAC);
166    RegisterSniffer_l(SniffAMR);
167    RegisterSniffer_l(SniffMPEG2TS);
168    RegisterSniffer_l(SniffMP3);
169    RegisterSniffer_l(SniffAAC);
170    RegisterSniffer_l(SniffMPEG2PS);
171    RegisterSniffer_l(SniffWVM);
172
173    char value[PROPERTY_VALUE_MAX];
174    if (property_get("drm.service.enabled", value, NULL)
175            && (!strcmp(value, "1") || !strcasecmp(value, "true"))) {
176        RegisterSniffer_l(SniffDRM);
177    }
178    gSniffersRegistered = true;
179}
180
181// static
182sp<DataSource> DataSource::CreateFromURI(
183        const sp<IMediaHTTPService> &httpService,
184        const char *uri,
185        const KeyedVector<String8, String8> *headers) {
186    bool isWidevine = !strncasecmp("widevine://", uri, 11);
187
188    sp<DataSource> source;
189    if (!strncasecmp("file://", uri, 7)) {
190        source = new FileSource(uri + 7);
191    } else if (!strncasecmp("http://", uri, 7)
192            || !strncasecmp("https://", uri, 8)
193            || isWidevine) {
194        sp<HTTPBase> httpSource = new MediaHTTP(httpService->makeHTTPConnection());
195
196        String8 tmp;
197        if (isWidevine) {
198            tmp = String8("http://");
199            tmp.append(uri + 11);
200
201            uri = tmp.string();
202        }
203
204        if (httpSource->connect(uri, headers) != OK) {
205            return NULL;
206        }
207
208        if (!isWidevine) {
209            String8 cacheConfig;
210            bool disconnectAtHighwatermark;
211            if (headers != NULL) {
212                KeyedVector<String8, String8> copy = *headers;
213                NuCachedSource2::RemoveCacheSpecificHeaders(
214                        &copy, &cacheConfig, &disconnectAtHighwatermark);
215            }
216
217            source = new NuCachedSource2(
218                    httpSource,
219                    cacheConfig.isEmpty() ? NULL : cacheConfig.string());
220        } else {
221            // We do not want that prefetching, caching, datasource wrapper
222            // in the widevine:// case.
223            source = httpSource;
224        }
225    } else if (!strncasecmp("data:", uri, 5)) {
226        source = DataURISource::Create(uri);
227    } else {
228        // Assume it's a filename.
229        source = new FileSource(uri);
230    }
231
232    if (source == NULL || source->initCheck() != OK) {
233        return NULL;
234    }
235
236    return source;
237}
238
239String8 DataSource::getMIMEType() const {
240    return String8("application/octet-stream");
241}
242
243}  // namespace android
244