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/*
* 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.
*/
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/FileSource.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
namespace android {
FileSource::FileSource(const char *filename)
: mFd(-1),
mOffset(0),
mLength(-1),
mDecryptHandle(NULL),
mDrmManagerClient(NULL),
mDrmBufOffset(0),
mDrmBufSize(0),
mDrmBuf(NULL){
mFd = open(filename, O_LARGEFILE | O_RDONLY);
if (mFd >= 0) {
mLength = lseek64(mFd, 0, SEEK_END);
} else {
ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
}
}
FileSource::FileSource(int fd, int64_t offset, int64_t length)
: mFd(fd),
mOffset(offset),
mLength(length),
mDecryptHandle(NULL),
mDrmManagerClient(NULL),
mDrmBufOffset(0),
mDrmBufSize(0),
mDrmBuf(NULL){
CHECK(offset >= 0);
CHECK(length >= 0);
}
FileSource::~FileSource() {
if (mFd >= 0) {
close(mFd);
mFd = -1;
}
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;
}
}
status_t FileSource::initCheck() const {
return mFd >= 0 ? OK : NO_INIT;
}
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.
}
int64_t numAvailable = mLength - offset;
if ((int64_t)size > numAvailable) {
size = numAvailable;
}
}
if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
== mDecryptHandle->decryptApiType) {
return readAtDRM(offset, data, size);
} else {
off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
if (result == -1) {
ALOGE("seek to %lld failed", offset + mOffset);
return UNKNOWN_ERROR;
}
return ::read(mFd, data, size);
}
}
status_t FileSource::getSize(off64_t *size) {
Mutex::Autolock autoLock(mLock);
if (mFd < 0) {
return NO_INIT;
}
*size = mLength;
return OK;
}
sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
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;
}
void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
handle = mDecryptHandle;
*client = mDrmManagerClient;
}
ssize_t FileSource::readAtDRM(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) <= (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 > 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);
}
}
} // namespace android
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