blob: 65780e348075efb1e45424efeae0617194844ddf [file] [log] [blame]
/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "FileSource"
#include <utils/Log.h>
#include <datasource/FileSource.h>
#include <media/stagefright/foundation/ADebug.h>
#include <private/android_filesystem_config.h>
namespace android {
FileSource::FileSource(const char *filename)
: ClearFileSource(filename),
mDecryptHandle(NULL),
mDrmManagerClient(NULL),
mDrmBufOffset(0),
mDrmBufSize(0),
mDrmBuf(NULL){
}
FileSource::FileSource(int fd, int64_t offset, int64_t length)
: ClearFileSource(fd, offset, length),
mDecryptHandle(NULL),
mDrmManagerClient(NULL),
mDrmBufOffset(0),
mDrmBufSize(0),
mDrmBuf(NULL) {
}
FileSource::~FileSource() {
if (mDrmBuf != NULL) {
delete[] mDrmBuf;
mDrmBuf = NULL;
}
if (mDecryptHandle != NULL) {
// To release mDecryptHandle
CHECK(mDrmManagerClient);
mDrmManagerClient->closeDecryptSession(mDecryptHandle);
mDecryptHandle = NULL;
}
if (mDrmManagerClient != NULL) {
delete mDrmManagerClient;
mDrmManagerClient = NULL;
}
}
ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
if (mFd < 0) {
return NO_INIT;
}
Mutex::Autolock autoLock(mLock);
if (mLength >= 0) {
if (offset >= mLength) {
return 0; // read beyond EOF.
}
uint64_t numAvailable = mLength - offset;
if ((uint64_t)size > numAvailable) {
size = numAvailable;
}
}
if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
== mDecryptHandle->decryptApiType) {
return readAtDRM_l(offset, data, size);
} else {
return readAt_l(offset, data, size);
}
}
sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
if (getuid() == AID_MEDIA_EX) return nullptr; // no DRM in media extractor
if (mDrmManagerClient == NULL) {
mDrmManagerClient = new DrmManagerClient();
}
if (mDrmManagerClient == NULL) {
return NULL;
}
if (mDecryptHandle == NULL) {
mDecryptHandle = mDrmManagerClient->openDecryptSession(
mFd, mOffset, mLength, mime);
}
if (mDecryptHandle == NULL) {
delete mDrmManagerClient;
mDrmManagerClient = NULL;
}
return mDecryptHandle;
}
ssize_t FileSource::readAtDRM_l(off64_t offset, void *data, size_t size) {
size_t DRM_CACHE_SIZE = 1024;
if (mDrmBuf == NULL) {
mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
}
if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
&& (offset + mOffset + size) <= static_cast<size_t>(mDrmBufOffset + mDrmBufSize)) {
/* Use buffered data */
memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
return size;
} else if (size <= DRM_CACHE_SIZE) {
/* Buffer new data */
mDrmBufOffset = offset + mOffset;
mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
DRM_CACHE_SIZE, offset + mOffset);
if (mDrmBufSize > 0) {
int64_t dataRead = 0;
dataRead = size > static_cast<size_t>(mDrmBufSize) ? mDrmBufSize : size;
memcpy(data, (void*)mDrmBuf, dataRead);
return dataRead;
} else {
return mDrmBufSize;
}
} else {
/* Too big chunk to cache. Call DRM directly */
return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
}
}
/* static */
bool FileSource::requiresDrm(int fd, int64_t offset, int64_t length, const char *mime) {
std::unique_ptr<DrmManagerClient> drmClient(new DrmManagerClient());
sp<DecryptHandle> decryptHandle =
drmClient->openDecryptSession(fd, offset, length, mime);
bool requiresDrm = false;
if (decryptHandle != nullptr) {
requiresDrm = decryptHandle->decryptApiType == DecryptApiType::CONTAINER_BASED;
drmClient->closeDecryptSession(decryptHandle);
}
return requiresDrm;
}
} // namespace android