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 //#define LOG_NDEBUG 0
18 #define LOG_TAG "FileSource"
19 #include <utils/Log.h>
20
21 #include <media/stagefright/foundation/ADebug.h>
22 #include <media/stagefright/FileSource.h>
23 #include <media/stagefright/Utils.h>
24 #include <private/android_filesystem_config.h>
25
26 namespace android {
27
FileSource(const char * filename)28 FileSource::FileSource(const char *filename)
29 : ClearFileSource(filename),
30 mDecryptHandle(NULL),
31 mDrmManagerClient(NULL),
32 mDrmBufOffset(0),
33 mDrmBufSize(0),
34 mDrmBuf(NULL){
35 }
36
FileSource(int fd,int64_t offset,int64_t length)37 FileSource::FileSource(int fd, int64_t offset, int64_t length)
38 : ClearFileSource(fd, offset, length),
39 mDecryptHandle(NULL),
40 mDrmManagerClient(NULL),
41 mDrmBufOffset(0),
42 mDrmBufSize(0),
43 mDrmBuf(NULL) {
44 }
45
~FileSource()46 FileSource::~FileSource() {
47 if (mDrmBuf != NULL) {
48 delete[] mDrmBuf;
49 mDrmBuf = NULL;
50 }
51
52 if (mDecryptHandle != NULL) {
53 // To release mDecryptHandle
54 CHECK(mDrmManagerClient);
55 mDrmManagerClient->closeDecryptSession(mDecryptHandle);
56 mDecryptHandle = NULL;
57 }
58
59 if (mDrmManagerClient != NULL) {
60 delete mDrmManagerClient;
61 mDrmManagerClient = NULL;
62 }
63 }
64
readAt(off64_t offset,void * data,size_t size)65 ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
66 if (mFd < 0) {
67 return NO_INIT;
68 }
69
70 Mutex::Autolock autoLock(mLock);
71
72 if (mLength >= 0) {
73 if (offset >= mLength) {
74 return 0; // read beyond EOF.
75 }
76 uint64_t numAvailable = mLength - offset;
77 if ((uint64_t)size > numAvailable) {
78 size = numAvailable;
79 }
80 }
81
82 if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
83 == mDecryptHandle->decryptApiType) {
84 return readAtDRM_l(offset, data, size);
85 } else {
86 return readAt_l(offset, data, size);
87 }
88 }
89
DrmInitialization(const char * mime)90 sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
91 if (getuid() == AID_MEDIA_EX) return nullptr; // no DRM in media extractor
92 if (mDrmManagerClient == NULL) {
93 mDrmManagerClient = new DrmManagerClient();
94 }
95
96 if (mDrmManagerClient == NULL) {
97 return NULL;
98 }
99
100 if (mDecryptHandle == NULL) {
101 mDecryptHandle = mDrmManagerClient->openDecryptSession(
102 mFd, mOffset, mLength, mime);
103 }
104
105 if (mDecryptHandle == NULL) {
106 delete mDrmManagerClient;
107 mDrmManagerClient = NULL;
108 }
109
110 return mDecryptHandle;
111 }
112
readAtDRM_l(off64_t offset,void * data,size_t size)113 ssize_t FileSource::readAtDRM_l(off64_t offset, void *data, size_t size) {
114 size_t DRM_CACHE_SIZE = 1024;
115 if (mDrmBuf == NULL) {
116 mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
117 }
118
119 if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
120 && (offset + mOffset + size) <= static_cast<size_t>(mDrmBufOffset + mDrmBufSize)) {
121 /* Use buffered data */
122 memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
123 return size;
124 } else if (size <= DRM_CACHE_SIZE) {
125 /* Buffer new data */
126 mDrmBufOffset = offset + mOffset;
127 mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
128 DRM_CACHE_SIZE, offset + mOffset);
129 if (mDrmBufSize > 0) {
130 int64_t dataRead = 0;
131 dataRead = size > static_cast<size_t>(mDrmBufSize) ? mDrmBufSize : size;
132 memcpy(data, (void*)mDrmBuf, dataRead);
133 return dataRead;
134 } else {
135 return mDrmBufSize;
136 }
137 } else {
138 /* Too big chunk to cache. Call DRM directly */
139 return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
140 }
141 }
142
143 /* static */
requiresDrm(int fd,int64_t offset,int64_t length,const char * mime)144 bool FileSource::requiresDrm(int fd, int64_t offset, int64_t length, const char *mime) {
145 std::unique_ptr<DrmManagerClient> drmClient(new DrmManagerClient());
146 sp<DecryptHandle> decryptHandle =
147 drmClient->openDecryptSession(fd, offset, length, mime);
148 bool requiresDrm = false;
149 if (decryptHandle != nullptr) {
150 requiresDrm = decryptHandle->decryptApiType == DecryptApiType::CONTAINER_BASED;
151 drmClient->closeDecryptSession(decryptHandle);
152 }
153 return requiresDrm;
154 }
155
156 } // namespace android
157