169 lines
4.0 KiB
C++
169 lines
4.0 KiB
C++
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include "packager/media/file/threaded_io_file.h"
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#include "packager/base/bind.h"
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#include "packager/base/bind_helpers.h"
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#include "packager/base/threading/platform_thread.h"
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#include "packager/media/base/closure_thread.h"
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namespace edash_packager {
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namespace media {
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ThreadedIoFile::ThreadedIoFile(scoped_ptr<File, FileCloser> internal_file,
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Mode mode,
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uint64_t io_cache_size,
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uint64_t io_block_size)
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: File(internal_file->file_name()),
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internal_file_(internal_file.Pass()),
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mode_(mode),
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cache_(io_cache_size),
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io_buffer_(io_block_size),
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size_(0),
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eof_(false),
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flushing_(false),
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flush_complete_event_(false, false),
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internal_file_error_(0){
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DCHECK(internal_file_);
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}
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ThreadedIoFile::~ThreadedIoFile() {}
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bool ThreadedIoFile::Open() {
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DCHECK(internal_file_);
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if (!internal_file_->Open())
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return false;
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size_ = internal_file_->Size();
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thread_.reset(new ClosureThread("ThreadedIoFile",
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base::Bind(mode_ == kInputMode ?
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&ThreadedIoFile::RunInInputMode :
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&ThreadedIoFile::RunInOutputMode,
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base::Unretained(this))));
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thread_->Start();
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return true;
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}
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bool ThreadedIoFile::Close() {
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DCHECK(internal_file_);
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DCHECK(thread_);
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if (mode_ == kOutputMode)
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Flush();
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cache_.Close();
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thread_->Join();
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bool result = internal_file_.release()->Close();
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delete this;
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return result;
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}
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int64_t ThreadedIoFile::Read(void* buffer, uint64_t length) {
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DCHECK(internal_file_);
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DCHECK(thread_);
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DCHECK_EQ(kInputMode, mode_);
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if (internal_file_error_)
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return internal_file_error_;
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if (eof_ && !cache_.BytesCached())
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return 0;
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return cache_.Read(buffer, length);
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}
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int64_t ThreadedIoFile::Write(const void* buffer, uint64_t length) {
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DCHECK(internal_file_);
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DCHECK(thread_);
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DCHECK_EQ(kOutputMode, mode_);
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if (internal_file_error_)
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return internal_file_error_;
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size_ += length;
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return cache_.Write(buffer, length);
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}
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int64_t ThreadedIoFile::Size() {
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DCHECK(internal_file_);
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DCHECK(thread_);
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return size_;
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}
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bool ThreadedIoFile::Flush() {
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DCHECK(internal_file_);
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DCHECK(thread_);
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DCHECK_EQ(kOutputMode, mode_);
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flushing_ = true;
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cache_.Close();
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flush_complete_event_.Wait();
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return internal_file_->Flush();
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}
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void ThreadedIoFile::RunInInputMode() {
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DCHECK(internal_file_);
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DCHECK(thread_);
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DCHECK_EQ(kInputMode, mode_);
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while (true) {
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int64_t read_result = internal_file_->Read(&io_buffer_[0],
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io_buffer_.size());
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if (read_result <= 0) {
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eof_ = read_result == 0;
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internal_file_error_ = read_result;
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cache_.Close();
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return;
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}
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cache_.Write(&io_buffer_[0], read_result);
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}
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}
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bool ThreadedIoFile::Seek(uint64_t position) {
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NOTIMPLEMENTED();
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return false;
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}
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bool ThreadedIoFile::Tell(uint64_t* position) {
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NOTIMPLEMENTED();
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return false;
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}
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void ThreadedIoFile::RunInOutputMode() {
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DCHECK(internal_file_);
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DCHECK(thread_);
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DCHECK_EQ(kOutputMode, mode_);
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while (true) {
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uint64_t write_bytes = cache_.Read(&io_buffer_[0], io_buffer_.size());
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if (write_bytes == 0) {
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if (flushing_) {
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cache_.Reopen();
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flushing_ = false;
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flush_complete_event_.Signal();
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} else {
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return;
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}
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} else {
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int64_t write_result = internal_file_->Write(&io_buffer_[0], write_bytes);
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if (write_result < 0) {
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internal_file_error_ = write_result;
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cache_.Close();
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return;
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}
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CHECK_EQ(write_result, static_cast<int64_t>(write_bytes));
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}
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}
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}
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} // namespace media
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} // namespace edash_packager
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