FileSource.cpp revision 63690d1588cb24929da7ced24ec341ed2a003825 
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
30namespace android {
31
32FileSource::FileSource(const char *filename)
33    : mFd(-1),
34      mOffset(0),
35      mLength(-1),
36      mDecryptHandle(NULL),
37      mDrmManagerClient(NULL),
38      mDrmBufOffset(0),
39      mDrmBufSize(0),
40      mDrmBuf(NULL){
41
42    ALOGV("%s", filename);
43    mFd = open(filename, O_LARGEFILE | O_RDONLY);
44
45    if (mFd >= 0) {
46        mLength = lseek64(mFd, 0, SEEK_END);
47    } else {
48        ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
49    }
50}
51
52FileSource::FileSource(int fd, int64_t offset, int64_t length)
53    : mFd(fd),
54      mOffset(offset),
55      mLength(length),
56      mDecryptHandle(NULL),
57      mDrmManagerClient(NULL),
58      mDrmBufOffset(0),
59      mDrmBufSize(0),
60      mDrmBuf(NULL) {
61    ALOGV("fd=%d (%s), offset=%lld, length=%lld",
62            fd, nameForFd(fd).c_str(), (long long) offset, (long long) length);
63
64    if (mOffset < 0) {
65        mOffset = 0;
66    }
67    if (mLength < 0) {
68        mLength = 0;
69    }
70    if (mLength > INT64_MAX - mOffset) {
71        mLength = INT64_MAX - mOffset;
72    }
73    struct stat s;
74    if (fstat(fd, &s) == 0) {
75        if (mOffset > s.st_size) {
76            mOffset = s.st_size;
77            mLength = 0;
78        }
79        if (mOffset + mLength > s.st_size) {
80            mLength = s.st_size - mOffset;
81        }
82    }
83    if (mOffset != offset || mLength != length) {
84        ALOGW("offset/length adjusted from %lld/%lld to %lld/%lld",
85                (long long) offset, (long long) length,
86                (long long) mOffset, (long long) mLength);
87    }
88}
89
90FileSource::~FileSource() {
91    if (mFd >= 0) {
92        ::close(mFd);
93        mFd = -1;
94    }
95
96    if (mDrmBuf != NULL) {
97        delete[] mDrmBuf;
98        mDrmBuf = NULL;
99    }
100
101    if (mDecryptHandle != NULL) {
102        // To release mDecryptHandle
103        CHECK(mDrmManagerClient);
104        mDrmManagerClient->closeDecryptSession(mDecryptHandle);
105        mDecryptHandle = NULL;
106    }
107
108    if (mDrmManagerClient != NULL) {
109        delete mDrmManagerClient;
110        mDrmManagerClient = NULL;
111    }
112}
113
114status_t FileSource::initCheck() const {
115    return mFd >= 0 ? OK : NO_INIT;
116}
117
118ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
119    if (mFd < 0) {
120        return NO_INIT;
121    }
122
123    Mutex::Autolock autoLock(mLock);
124
125    if (mLength >= 0) {
126        if (offset >= mLength) {
127            return 0;  // read beyond EOF.
128        }
129        uint64_t numAvailable = mLength - offset;
130        if ((uint64_t)size > numAvailable) {
131            size = numAvailable;
132        }
133    }
134
135    if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
136            == mDecryptHandle->decryptApiType) {
137        return readAtDRM(offset, data, size);
138   } else {
139        off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
140        if (result == -1) {
141            ALOGE("seek to %lld failed", (long long)(offset + mOffset));
142            return UNKNOWN_ERROR;
143        }
144
145        return ::read(mFd, data, size);
146    }
147}
148
149status_t FileSource::getSize(off64_t *size) {
150    Mutex::Autolock autoLock(mLock);
151
152    if (mFd < 0) {
153        return NO_INIT;
154    }
155
156    *size = mLength;
157
158    return OK;
159}
160
161sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
162    if (mDrmManagerClient == NULL) {
163        mDrmManagerClient = new DrmManagerClient();
164    }
165
166    if (mDrmManagerClient == NULL) {
167        return NULL;
168    }
169
170    if (mDecryptHandle == NULL) {
171        mDecryptHandle = mDrmManagerClient->openDecryptSession(
172                mFd, mOffset, mLength, mime);
173    }
174
175    if (mDecryptHandle == NULL) {
176        delete mDrmManagerClient;
177        mDrmManagerClient = NULL;
178    }
179
180    return mDecryptHandle;
181}
182
183void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
184    handle = mDecryptHandle;
185
186    *client = mDrmManagerClient;
187}
188
189ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
190    size_t DRM_CACHE_SIZE = 1024;
191    if (mDrmBuf == NULL) {
192        mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
193    }
194
195    if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
196            && (offset + mOffset + size) <= static_cast<size_t>(mDrmBufOffset + mDrmBufSize)) {
197        /* Use buffered data */
198        memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
199        return size;
200    } else if (size <= DRM_CACHE_SIZE) {
201        /* Buffer new data */
202        mDrmBufOffset =  offset + mOffset;
203        mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
204                DRM_CACHE_SIZE, offset + mOffset);
205        if (mDrmBufSize > 0) {
206            int64_t dataRead = 0;
207            dataRead = size > static_cast<size_t>(mDrmBufSize) ? mDrmBufSize : size;
208            memcpy(data, (void*)mDrmBuf, dataRead);
209            return dataRead;
210        } else {
211            return mDrmBufSize;
212        }
213    } else {
214        /* Too big chunk to cache. Call DRM directly */
215        return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
216    }
217}
218}  // namespace android
219