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247 lines
6.8 KiB
247 lines
6.8 KiB
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "FileSource"
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#include <utils/Log.h>
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#include <media/stagefright/foundation/ADebug.h>
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#include <media/stagefright/FileSource.h>
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#include <media/stagefright/Utils.h>
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#include <private/android_filesystem_config.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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namespace android {
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FileSource::FileSource(const char *filename)
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: mFd(-1),
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mOffset(0),
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mLength(-1),
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mName("<null>"),
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mDecryptHandle(NULL),
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mDrmManagerClient(NULL),
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mDrmBufOffset(0),
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mDrmBufSize(0),
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mDrmBuf(NULL){
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if (filename) {
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mName = String8::format("FileSource(%s)", filename);
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}
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ALOGV("%s", filename);
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mFd = open(filename, O_LARGEFILE | O_RDONLY);
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if (mFd >= 0) {
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mLength = lseek64(mFd, 0, SEEK_END);
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} else {
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ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
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}
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}
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FileSource::FileSource(int fd, int64_t offset, int64_t length)
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: mFd(fd),
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mOffset(offset),
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mLength(length),
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mName("<null>"),
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mDecryptHandle(NULL),
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mDrmManagerClient(NULL),
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mDrmBufOffset(0),
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mDrmBufSize(0),
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mDrmBuf(NULL) {
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ALOGV("fd=%d (%s), offset=%lld, length=%lld",
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fd, nameForFd(fd).c_str(), (long long) offset, (long long) length);
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if (mOffset < 0) {
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mOffset = 0;
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}
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if (mLength < 0) {
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mLength = 0;
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}
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if (mLength > INT64_MAX - mOffset) {
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mLength = INT64_MAX - mOffset;
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}
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struct stat s;
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if (fstat(fd, &s) == 0) {
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if (mOffset > s.st_size) {
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mOffset = s.st_size;
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mLength = 0;
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}
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if (mOffset + mLength > s.st_size) {
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mLength = s.st_size - mOffset;
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}
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}
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if (mOffset != offset || mLength != length) {
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ALOGW("offset/length adjusted from %lld/%lld to %lld/%lld",
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(long long) offset, (long long) length,
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(long long) mOffset, (long long) mLength);
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}
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mName = String8::format(
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"FileSource(fd(%s), %lld, %lld)",
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nameForFd(fd).c_str(),
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(long long) mOffset,
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(long long) mLength);
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}
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FileSource::~FileSource() {
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if (mFd >= 0) {
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::close(mFd);
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mFd = -1;
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}
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if (mDrmBuf != NULL) {
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delete[] mDrmBuf;
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mDrmBuf = NULL;
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}
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if (mDecryptHandle != NULL) {
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// To release mDecryptHandle
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CHECK(mDrmManagerClient);
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mDrmManagerClient->closeDecryptSession(mDecryptHandle);
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mDecryptHandle = NULL;
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}
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if (mDrmManagerClient != NULL) {
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delete mDrmManagerClient;
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mDrmManagerClient = NULL;
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}
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}
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status_t FileSource::initCheck() const {
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return mFd >= 0 ? OK : NO_INIT;
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}
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ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
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if (mFd < 0) {
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return NO_INIT;
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}
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Mutex::Autolock autoLock(mLock);
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if (mLength >= 0) {
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if (offset >= mLength) {
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return 0; // read beyond EOF.
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}
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uint64_t numAvailable = mLength - offset;
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if ((uint64_t)size > numAvailable) {
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size = numAvailable;
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}
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}
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if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
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== mDecryptHandle->decryptApiType) {
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return readAtDRM(offset, data, size);
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} else {
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off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
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if (result == -1) {
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ALOGE("seek to %lld failed", (long long)(offset + mOffset));
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return UNKNOWN_ERROR;
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}
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return ::read(mFd, data, size);
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}
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}
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status_t FileSource::getSize(off64_t *size) {
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Mutex::Autolock autoLock(mLock);
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if (mFd < 0) {
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return NO_INIT;
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}
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*size = mLength;
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return OK;
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}
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sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
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if (getuid() == AID_MEDIA_EX) return nullptr; // no DRM in media extractor
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if (mDrmManagerClient == NULL) {
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mDrmManagerClient = new DrmManagerClient();
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}
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if (mDrmManagerClient == NULL) {
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return NULL;
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}
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if (mDecryptHandle == NULL) {
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mDecryptHandle = mDrmManagerClient->openDecryptSession(
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mFd, mOffset, mLength, mime);
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}
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if (mDecryptHandle == NULL) {
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delete mDrmManagerClient;
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mDrmManagerClient = NULL;
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}
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return mDecryptHandle;
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}
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void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
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handle = mDecryptHandle;
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*client = mDrmManagerClient;
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}
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ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
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size_t DRM_CACHE_SIZE = 1024;
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if (mDrmBuf == NULL) {
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mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
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}
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if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
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&& (offset + mOffset + size) <= static_cast<size_t>(mDrmBufOffset + mDrmBufSize)) {
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/* Use buffered data */
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memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
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return size;
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} else if (size <= DRM_CACHE_SIZE) {
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/* Buffer new data */
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mDrmBufOffset = offset + mOffset;
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mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
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DRM_CACHE_SIZE, offset + mOffset);
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if (mDrmBufSize > 0) {
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int64_t dataRead = 0;
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dataRead = size > static_cast<size_t>(mDrmBufSize) ? mDrmBufSize : size;
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memcpy(data, (void*)mDrmBuf, dataRead);
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return dataRead;
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} else {
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return mDrmBufSize;
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}
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} else {
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/* Too big chunk to cache. Call DRM directly */
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return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
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}
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}
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/* static */
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bool FileSource::requiresDrm(int fd, int64_t offset, int64_t length, const char *mime) {
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std::unique_ptr<DrmManagerClient> drmClient(new DrmManagerClient());
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sp<DecryptHandle> decryptHandle =
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drmClient->openDecryptSession(fd, offset, length, mime);
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bool requiresDrm = false;
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if (decryptHandle != nullptr) {
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requiresDrm = decryptHandle->decryptApiType == DecryptApiType::CONTAINER_BASED;
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drmClient->closeDecryptSession(decryptHandle);
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}
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return requiresDrm;
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}
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} // namespace android
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