blob: c859f03c4c3d30844030b0cea73e4a7f2648734e [file] [log] [blame]
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdint.h>
#include <map>
#include <string>
#include "base/memory/ref_counted.h"
#include "base/threading/thread_checker.h"
#include "chrome/utility/utility_message_handler.h"
#include "media/base/data_source.h"
namespace base {
class TaskRunner;
namespace metadata {
// Provides the metadata parser with bytes from the browser process via IPC.
// Class must be created and destroyed on the utility thread. Class may be used
// as a DataSource on a different thread. The utility thread must not be blocked
// for read operations to succeed.
class IPCDataSource: public media::DataSource,
public UtilityMessageHandler {
// May only be called on the utility thread.
explicit IPCDataSource(int64_t total_size);
~IPCDataSource() override;
// Implementation of DataSource. These methods may be called on any single
// thread. First usage of these methods attaches a thread checker.
void Stop() override;
void Abort() override;
void Read(int64_t position,
int size,
uint8_t* data,
const ReadCB& read_cb) override;
bool GetSize(int64_t* size_out) override;
bool IsStreaming() override;
void SetBitrate(int bitrate) override;
// Implementation of UtilityMessageHandler. May only be called on the utility
// thread.
bool OnMessageReceived(const IPC::Message& message) override;
struct Request {
Request(const Request& other);
uint8_t* destination;
ReadCB callback;
void ReadOnUtilityThread(int64_t position,
int size,
uint8_t* data,
const ReadCB& read_cb);
void OnRequestBlobBytesFinished(int64_t request_id, const std::string& bytes);
const int64_t total_size_;
scoped_refptr<base::TaskRunner> utility_task_runner_;
std::map<int64_t, Request> pending_requests_;
int64_t next_request_id_;
base::ThreadChecker utility_thread_checker_;
// Enforces that the DataSource methods are called on one other thread only.
base::ThreadChecker data_source_thread_checker_;
} // namespace metadata