FileSource.cpp revision 8f64134f749e4f7861a08a3063450fc714c4651d
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/FileSource.h> 18#include <media/stagefright/MediaDebug.h> 19#include <sys/types.h> 20#include <unistd.h> 21#include <sys/types.h> 22#include <sys/stat.h> 23#include <fcntl.h> 24 25namespace android { 26 27FileSource::FileSource(const char *filename) 28 : mFd(-1), 29 mOffset(0), 30 mLength(-1), 31 mDecryptHandle(NULL), 32 mDrmManagerClient(NULL), 33 mDrmBufOffset(0), 34 mDrmBufSize(0), 35 mDrmBuf(NULL){ 36 37 mFd = open(filename, O_LARGEFILE | O_RDONLY); 38} 39 40FileSource::FileSource(int fd, int64_t offset, int64_t length) 41 : mFd(fd), 42 mOffset(offset), 43 mLength(length), 44 mDecryptHandle(NULL), 45 mDrmManagerClient(NULL), 46 mDrmBufOffset(0), 47 mDrmBufSize(0), 48 mDrmBuf(NULL){ 49 CHECK(offset >= 0); 50 CHECK(length >= 0); 51} 52 53FileSource::~FileSource() { 54 if (mFd >= 0) { 55 close(mFd); 56 mFd = -1; 57 } 58 59 if (mDrmBuf != NULL) { 60 delete[] mDrmBuf; 61 mDrmBuf = NULL; 62 } 63 64 if (mDecryptHandle != NULL) { 65 // To release mDecryptHandle 66 CHECK(mDrmManagerClient); 67 mDrmManagerClient->closeDecryptSession(mDecryptHandle); 68 mDecryptHandle = NULL; 69 } 70 71 if (mDrmManagerClient != NULL) { 72 delete mDrmManagerClient; 73 mDrmManagerClient = NULL; 74 } 75} 76 77status_t FileSource::initCheck() const { 78 return mFd >= 0 ? OK : NO_INIT; 79} 80 81ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) { 82 if (mFd < 0) { 83 return NO_INIT; 84 } 85 86 Mutex::Autolock autoLock(mLock); 87 88 if (mLength >= 0) { 89 if (offset >= mLength) { 90 return 0; // read beyond EOF. 91 } 92 int64_t numAvailable = mLength - offset; 93 if ((int64_t)size > numAvailable) { 94 size = numAvailable; 95 } 96 } 97 98 if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED 99 == mDecryptHandle->decryptApiType) { 100 return readAtDRM(offset, data, size); 101 } else { 102 off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET); 103 if (result == -1) { 104 LOGE("seek to %lld failed", offset + mOffset); 105 return UNKNOWN_ERROR; 106 } 107 108 return ::read(mFd, data, size); 109 } 110} 111 112status_t FileSource::getSize(off64_t *size) { 113 if (mFd < 0) { 114 return NO_INIT; 115 } 116 117 if (mLength >= 0) { 118 *size = mLength; 119 120 return OK; 121 } 122 123 *size = lseek64(mFd, 0, SEEK_END); 124 125 return OK; 126} 127 128DecryptHandle* FileSource::DrmInitialization() { 129 if (mDrmManagerClient == NULL) { 130 mDrmManagerClient = new DrmManagerClient(); 131 } 132 133 if (mDrmManagerClient == NULL) { 134 return NULL; 135 } 136 137 if (mDecryptHandle == NULL) { 138 mDecryptHandle = mDrmManagerClient->openDecryptSession( 139 mFd, mOffset, mLength); 140 } 141 142 if (mDecryptHandle == NULL) { 143 delete mDrmManagerClient; 144 mDrmManagerClient = NULL; 145 } 146 147 return mDecryptHandle; 148} 149 150void FileSource::getDrmInfo(DecryptHandle **handle, DrmManagerClient **client) { 151 *handle = mDecryptHandle; 152 153 *client = mDrmManagerClient; 154} 155 156ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) { 157 size_t DRM_CACHE_SIZE = 1024; 158 if (mDrmBuf == NULL) { 159 mDrmBuf = new unsigned char[DRM_CACHE_SIZE]; 160 } 161 162 if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset 163 && (offset + mOffset + size) <= (mDrmBufOffset + mDrmBufSize)) { 164 /* Use buffered data */ 165 memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size); 166 return size; 167 } else if (size <= DRM_CACHE_SIZE) { 168 /* Buffer new data */ 169 mDrmBufOffset = offset + mOffset; 170 mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf, 171 DRM_CACHE_SIZE, offset + mOffset); 172 if (mDrmBufSize > 0) { 173 int64_t dataRead = 0; 174 dataRead = size > mDrmBufSize ? mDrmBufSize : size; 175 memcpy(data, (void*)mDrmBuf, dataRead); 176 return dataRead; 177 } else { 178 return mDrmBufSize; 179 } 180 } else { 181 /* Too big chunk to cache. Call DRM directly */ 182 return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset); 183 } 184} 185} // namespace android 186