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 <sys/types.h>
25 #include <unistd.h>
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <fcntl.h>
29
30 namespace android {
31
FileSource(const char * filename)32 FileSource::FileSource(const char *filename)
33 : mFd(-1),
34 mOffset(0),
35 mLength(-1),
36 mName("<null>"),
37 mDecryptHandle(NULL),
38 mDrmManagerClient(NULL),
39 mDrmBufOffset(0),
40 mDrmBufSize(0),
41 mDrmBuf(NULL){
42
43 if (filename) {
44 mName = String8::format("FileSource(%s)", filename);
45 }
46 ALOGV("%s", filename);
47 mFd = open(filename, O_LARGEFILE | O_RDONLY);
48
49 if (mFd >= 0) {
50 mLength = lseek64(mFd, 0, SEEK_END);
51 } else {
52 ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
53 }
54 }
55
FileSource(int fd,int64_t offset,int64_t length)56 FileSource::FileSource(int fd, int64_t offset, int64_t length)
57 : mFd(fd),
58 mOffset(offset),
59 mLength(length),
60 mName("<null>"),
61 mDecryptHandle(NULL),
62 mDrmManagerClient(NULL),
63 mDrmBufOffset(0),
64 mDrmBufSize(0),
65 mDrmBuf(NULL) {
66 ALOGV("fd=%d (%s), offset=%lld, length=%lld",
67 fd, nameForFd(fd).c_str(), (long long) offset, (long long) length);
68
69 if (mOffset < 0) {
70 mOffset = 0;
71 }
72 if (mLength < 0) {
73 mLength = 0;
74 }
75 if (mLength > INT64_MAX - mOffset) {
76 mLength = INT64_MAX - mOffset;
77 }
78 struct stat s;
79 if (fstat(fd, &s) == 0) {
80 if (mOffset > s.st_size) {
81 mOffset = s.st_size;
82 mLength = 0;
83 }
84 if (mOffset + mLength > s.st_size) {
85 mLength = s.st_size - mOffset;
86 }
87 }
88 if (mOffset != offset || mLength != length) {
89 ALOGW("offset/length adjusted from %lld/%lld to %lld/%lld",
90 (long long) offset, (long long) length,
91 (long long) mOffset, (long long) mLength);
92 }
93
94 mName = String8::format(
95 "FileSource(fd(%s), %lld, %lld)",
96 nameForFd(fd).c_str(),
97 (long long) mOffset,
98 (long long) mLength);
99
100 }
101
~FileSource()102 FileSource::~FileSource() {
103 if (mFd >= 0) {
104 ::close(mFd);
105 mFd = -1;
106 }
107
108 if (mDrmBuf != NULL) {
109 delete[] mDrmBuf;
110 mDrmBuf = NULL;
111 }
112
113 if (mDecryptHandle != NULL) {
114 // To release mDecryptHandle
115 CHECK(mDrmManagerClient);
116 mDrmManagerClient->closeDecryptSession(mDecryptHandle);
117 mDecryptHandle = NULL;
118 }
119
120 if (mDrmManagerClient != NULL) {
121 delete mDrmManagerClient;
122 mDrmManagerClient = NULL;
123 }
124 }
125
initCheck() const126 status_t FileSource::initCheck() const {
127 return mFd >= 0 ? OK : NO_INIT;
128 }
129
readAt(off64_t offset,void * data,size_t size)130 ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
131 if (mFd < 0) {
132 return NO_INIT;
133 }
134
135 Mutex::Autolock autoLock(mLock);
136
137 if (mLength >= 0) {
138 if (offset >= mLength) {
139 return 0; // read beyond EOF.
140 }
141 uint64_t numAvailable = mLength - offset;
142 if ((uint64_t)size > numAvailable) {
143 size = numAvailable;
144 }
145 }
146
147 if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
148 == mDecryptHandle->decryptApiType) {
149 return readAtDRM(offset, data, size);
150 } else {
151 off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
152 if (result == -1) {
153 ALOGE("seek to %lld failed", (long long)(offset + mOffset));
154 return UNKNOWN_ERROR;
155 }
156
157 return ::read(mFd, data, size);
158 }
159 }
160
getSize(off64_t * size)161 status_t FileSource::getSize(off64_t *size) {
162 Mutex::Autolock autoLock(mLock);
163
164 if (mFd < 0) {
165 return NO_INIT;
166 }
167
168 *size = mLength;
169
170 return OK;
171 }
172
DrmInitialization(const char * mime)173 sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
174 if (mDrmManagerClient == NULL) {
175 mDrmManagerClient = new DrmManagerClient();
176 }
177
178 if (mDrmManagerClient == NULL) {
179 return NULL;
180 }
181
182 if (mDecryptHandle == NULL) {
183 mDecryptHandle = mDrmManagerClient->openDecryptSession(
184 mFd, mOffset, mLength, mime);
185 }
186
187 if (mDecryptHandle == NULL) {
188 delete mDrmManagerClient;
189 mDrmManagerClient = NULL;
190 }
191
192 return mDecryptHandle;
193 }
194
getDrmInfo(sp<DecryptHandle> & handle,DrmManagerClient ** client)195 void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
196 handle = mDecryptHandle;
197
198 *client = mDrmManagerClient;
199 }
200
readAtDRM(off64_t offset,void * data,size_t size)201 ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
202 size_t DRM_CACHE_SIZE = 1024;
203 if (mDrmBuf == NULL) {
204 mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
205 }
206
207 if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
208 && (offset + mOffset + size) <= static_cast<size_t>(mDrmBufOffset + mDrmBufSize)) {
209 /* Use buffered data */
210 memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
211 return size;
212 } else if (size <= DRM_CACHE_SIZE) {
213 /* Buffer new data */
214 mDrmBufOffset = offset + mOffset;
215 mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
216 DRM_CACHE_SIZE, offset + mOffset);
217 if (mDrmBufSize > 0) {
218 int64_t dataRead = 0;
219 dataRead = size > static_cast<size_t>(mDrmBufSize) ? mDrmBufSize : size;
220 memcpy(data, (void*)mDrmBuf, dataRead);
221 return dataRead;
222 } else {
223 return mDrmBufSize;
224 }
225 } else {
226 /* Too big chunk to cache. Call DRM directly */
227 return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
228 }
229 }
230 } // namespace android
231