FileSource.cpp revision 5f80c6f508ebafbe81d42177907035731e854c5b
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 CHECK(offset >= 0); 65 CHECK(length >= 0); 66} 67 68FileSource::~FileSource() { 69 if (mFd >= 0) { 70 close(mFd); 71 mFd = -1; 72 } 73 74 if (mDrmBuf != NULL) { 75 delete[] mDrmBuf; 76 mDrmBuf = NULL; 77 } 78 79 if (mDecryptHandle != NULL) { 80 // To release mDecryptHandle 81 CHECK(mDrmManagerClient); 82 mDrmManagerClient->closeDecryptSession(mDecryptHandle); 83 mDecryptHandle = NULL; 84 } 85 86 if (mDrmManagerClient != NULL) { 87 delete mDrmManagerClient; 88 mDrmManagerClient = NULL; 89 } 90} 91 92status_t FileSource::initCheck() const { 93 return mFd >= 0 ? OK : NO_INIT; 94} 95 96ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) { 97 if (mFd < 0) { 98 return NO_INIT; 99 } 100 101 Mutex::Autolock autoLock(mLock); 102 103 if (mLength >= 0) { 104 if (offset >= mLength) { 105 return 0; // read beyond EOF. 106 } 107 uint64_t numAvailable = mLength - offset; 108 if ((uint64_t)size > numAvailable) { 109 size = numAvailable; 110 } 111 } 112 113 if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED 114 == mDecryptHandle->decryptApiType) { 115 return readAtDRM(offset, data, size); 116 } else { 117 off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET); 118 if (result == -1) { 119 ALOGE("seek to %lld failed", (long long)(offset + mOffset)); 120 return UNKNOWN_ERROR; 121 } 122 123 return ::read(mFd, data, size); 124 } 125} 126 127status_t FileSource::getSize(off64_t *size) { 128 Mutex::Autolock autoLock(mLock); 129 130 if (mFd < 0) { 131 return NO_INIT; 132 } 133 134 *size = mLength; 135 136 return OK; 137} 138 139sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) { 140 if (mDrmManagerClient == NULL) { 141 mDrmManagerClient = new DrmManagerClient(); 142 } 143 144 if (mDrmManagerClient == NULL) { 145 return NULL; 146 } 147 148 if (mDecryptHandle == NULL) { 149 mDecryptHandle = mDrmManagerClient->openDecryptSession( 150 mFd, mOffset, mLength, mime); 151 } 152 153 if (mDecryptHandle == NULL) { 154 delete mDrmManagerClient; 155 mDrmManagerClient = NULL; 156 } 157 158 return mDecryptHandle; 159} 160 161void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) { 162 handle = mDecryptHandle; 163 164 *client = mDrmManagerClient; 165} 166 167ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) { 168 size_t DRM_CACHE_SIZE = 1024; 169 if (mDrmBuf == NULL) { 170 mDrmBuf = new unsigned char[DRM_CACHE_SIZE]; 171 } 172 173 if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset 174 && (offset + mOffset + size) <= static_cast<size_t>(mDrmBufOffset + mDrmBufSize)) { 175 /* Use buffered data */ 176 memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size); 177 return size; 178 } else if (size <= DRM_CACHE_SIZE) { 179 /* Buffer new data */ 180 mDrmBufOffset = offset + mOffset; 181 mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf, 182 DRM_CACHE_SIZE, offset + mOffset); 183 if (mDrmBufSize > 0) { 184 int64_t dataRead = 0; 185 dataRead = size > static_cast<size_t>(mDrmBufSize) ? mDrmBufSize : size; 186 memcpy(data, (void*)mDrmBuf, dataRead); 187 return dataRead; 188 } else { 189 return mDrmBufSize; 190 } 191 } else { 192 /* Too big chunk to cache. Call DRM directly */ 193 return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset); 194 } 195} 196} // namespace android 197