FileSource.cpp revision 69d3d8a9540b0da787ea0beccad2517f057dd54d
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 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 56FileSource::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 102FileSource::~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 126status_t FileSource::initCheck() const { 127 return mFd >= 0 ? OK : NO_INIT; 128} 129 130ssize_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 161status_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 173sp<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 195void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) { 196 handle = mDecryptHandle; 197 198 *client = mDrmManagerClient; 199} 200 201ssize_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