// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_SERVICES_ASSISTANT_AUDIO_DECODER_IPC_DATA_SOURCE_H_
#define CHROMEOS_ASH_SERVICES_ASSISTANT_AUDIO_DECODER_IPC_DATA_SOURCE_H_
#include <stdint.h>
#include "base/task/sequenced_task_runner.h"
#include "base/threading/thread_checker.h"
#include "chromeos/ash/services/assistant/public/mojom/assistant_audio_decoder.mojom.h"
#include "media/base/data_source.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace ash::assistant {
// Provides data source to the audio stream decoder. Class must be created and
// destroyed on a same thread. The thread must not be blocked for read
// operations to succeed.
class IPCDataSource : public media::DataSource {
public:
// May only be called on the utility thread.
explicit IPCDataSource(
mojo::PendingRemote<mojom::AssistantMediaDataSource> media_data_source);
IPCDataSource(const IPCDataSource&) = delete;
IPCDataSource& operator=(const IPCDataSource&) = delete;
~IPCDataSource() override;
// media::DataSource implementation. The 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* destination,
ReadCB callback) override;
bool GetSize(int64_t* size_out) override;
bool IsStreaming() override;
void SetBitrate(int bitrate) override;
bool PassedTimingAllowOriginCheck() override;
bool WouldTaintOrigin() override;
private:
// Media data read helpers: must be run on the utility thread.
void ReadMediaData(uint8_t* destination, ReadCB callback, int size);
void ReadDone(uint8_t* destination,
ReadCB callback,
uint32_t requested_size,
const std::vector<uint8_t>& data);
mojo::Remote<mojom::AssistantMediaDataSource> media_data_source_;
scoped_refptr<base::SequencedTaskRunner> utility_task_runner_;
THREAD_CHECKER(utility_thread_checker_);
// Enforces that the DataSource methods are called on one other thread only.
THREAD_CHECKER(data_source_thread_checker_);
};
} // namespace ash::assistant
#endif // CHROMEOS_ASH_SERVICES_ASSISTANT_AUDIO_DECODER_IPC_DATA_SOURCE_H_