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 <media/stagefright/AMRExtractor.h>
18 #include <media/stagefright/DataSource.h>
19 #include <media/stagefright/MediaErrors.h>
20 #include <media/stagefright/MP3Extractor.h>
21 #include <media/stagefright/MPEG4Extractor.h>
22 #include <utils/String8.h>
23
24 namespace android {
25
getUInt16(off_t offset,uint16_t * x)26 bool DataSource::getUInt16(off_t offset, uint16_t *x) {
27 *x = 0;
28
29 uint8_t byte[2];
30 if (read_at(offset, byte, 2) != 2) {
31 return false;
32 }
33
34 *x = (byte[0] << 8) | byte[1];
35
36 return true;
37 }
38
getSize(off_t * size)39 status_t DataSource::getSize(off_t *size) {
40 *size = 0;
41
42 return ERROR_UNSUPPORTED;
43 }
44
45 ////////////////////////////////////////////////////////////////////////////////
46
47 Mutex DataSource::gSnifferMutex;
48 List<DataSource::SnifferFunc> DataSource::gSniffers;
49
sniff(String8 * mimeType,float * confidence)50 bool DataSource::sniff(String8 *mimeType, float *confidence) {
51 *mimeType = "";
52 *confidence = 0.0f;
53
54 Mutex::Autolock autoLock(gSnifferMutex);
55 for (List<SnifferFunc>::iterator it = gSniffers.begin();
56 it != gSniffers.end(); ++it) {
57 String8 newMimeType;
58 float newConfidence;
59 if ((*it)(this, &newMimeType, &newConfidence)) {
60 if (newConfidence > *confidence) {
61 *mimeType = newMimeType;
62 *confidence = newConfidence;
63 }
64 }
65 }
66
67 return *confidence > 0.0;
68 }
69
70 // static
RegisterSniffer(SnifferFunc func)71 void DataSource::RegisterSniffer(SnifferFunc func) {
72 Mutex::Autolock autoLock(gSnifferMutex);
73
74 for (List<SnifferFunc>::iterator it = gSniffers.begin();
75 it != gSniffers.end(); ++it) {
76 if (*it == func) {
77 return;
78 }
79 }
80
81 gSniffers.push_back(func);
82 }
83
84 // static
RegisterDefaultSniffers()85 void DataSource::RegisterDefaultSniffers() {
86 RegisterSniffer(SniffMP3);
87 RegisterSniffer(SniffMPEG4);
88 RegisterSniffer(SniffAMR);
89 }
90
91 } // namespace android
92