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//
// Copyright (C) 2020 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.
#pragma once
#include <atomic>
#include <cinttypes>
#include <functional>
#include "host/libs/audio_connector/shm_layout.h"
namespace cuttlefish {
enum class Status : uint32_t {
Ok = 0x8000,
BadMessage,
NotSupported,
IOError,
};
using OnConsumedCb = std::function<void(AudioStatus, uint32_t /*latency*/,
uint32_t /*consumed length*/)>;
// Wraps and provides access to audio buffers sent by the client.
// Objects of this class can only be moved, not copied. Destroying a buffer
// without sending the status to the client is a bug so the program aborts in
// those cases.
// This class is NOT thread safe despite its use of atomic variables.
class ShmBuffer {
public:
ShmBuffer(const virtio_snd_pcm_xfer& header, volatile uint8_t* buffer,
uint32_t len, OnConsumedCb on_consumed);
ShmBuffer(const ShmBuffer& other) = delete;
ShmBuffer(ShmBuffer&& other);
ShmBuffer& operator=(const ShmBuffer& other) = delete;
~ShmBuffer();
uint32_t stream_id() const;
uint32_t len() const { return len_; }
void SendStatus(AudioStatus status, uint32_t latency_bytes,
uint32_t consumed_len);
const uint8_t* get() const { return buffer_; }
private:
const virtio_snd_pcm_xfer header_;
const uint32_t len_;
OnConsumedCb on_consumed_;
std::atomic<bool> status_sent_ = false;
protected:
uint8_t* buffer_;
};
using TxBuffer = ShmBuffer;
// Only RxBuffer can be written to
class RxBuffer : public ShmBuffer {
public:
RxBuffer(const virtio_snd_pcm_xfer& header, volatile uint8_t* buffer,
uint32_t len, OnConsumedCb on_consumed)
: ShmBuffer(header, buffer, len, on_consumed) {}
uint8_t* get() { return buffer_; }
};
} // namespace cuttlefish
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