| /* |
| * 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 "MmapSource" |
| #include <utils/Log.h> |
| |
| #include <sys/mman.h> |
| |
| #include <fcntl.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <media/stagefright/MediaDebug.h> |
| #include <media/stagefright/MmapSource.h> |
| |
| namespace android { |
| |
| MmapSource::MmapSource(const char *filename) |
| : mFd(open(filename, O_RDONLY)), |
| mBase(NULL), |
| mSize(0) { |
| LOGV("MmapSource '%s'", filename); |
| CHECK(mFd >= 0); |
| |
| off_t size = lseek(mFd, 0, SEEK_END); |
| mSize = (size_t)size; |
| |
| mBase = mmap(0, mSize, PROT_READ, MAP_FILE | MAP_SHARED, mFd, 0); |
| |
| if (mBase == (void *)-1) { |
| mBase = NULL; |
| |
| close(mFd); |
| mFd = -1; |
| } |
| } |
| |
| MmapSource::MmapSource(int fd, int64_t offset, int64_t length) |
| : mFd(fd), |
| mBase(NULL), |
| mSize(length) { |
| LOGV("MmapSource fd:%d offset:%lld length:%lld", fd, offset, length); |
| CHECK(fd >= 0); |
| |
| mBase = mmap(0, mSize, PROT_READ, MAP_FILE | MAP_SHARED, mFd, offset); |
| |
| if (mBase == (void *)-1) { |
| mBase = NULL; |
| |
| close(mFd); |
| mFd = -1; |
| } |
| |
| } |
| |
| MmapSource::~MmapSource() { |
| if (mFd != -1) { |
| munmap(mBase, mSize); |
| mBase = NULL; |
| mSize = 0; |
| |
| close(mFd); |
| mFd = -1; |
| } |
| } |
| |
| status_t MmapSource::InitCheck() const { |
| return mFd == -1 ? NO_INIT : OK; |
| } |
| |
| ssize_t MmapSource::read_at(off_t offset, void *data, size_t size) { |
| LOGV("read_at offset:%ld data:%p size:%d", offset, data, size); |
| CHECK(offset >= 0); |
| |
| size_t avail = 0; |
| if (offset >= 0 && offset < (off_t)mSize) { |
| avail = mSize - offset; |
| } |
| |
| if (size > avail) { |
| size = avail; |
| } |
| |
| memcpy(data, (const uint8_t *)mBase + offset, size); |
| |
| return (ssize_t)size; |
| } |
| |
| status_t MmapSource::getSize(off_t *size) { |
| *size = mSize; |
| |
| return OK; |
| } |
| |
| } // namespace android |
| |