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/*
* Copyright (C) 2011 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.
*/
#ifndef __AAH_TX_SENDER_H__
#define __AAH_TX_SENDER_H__
#include <media/stagefright/foundation/ALooper.h>
#include <media/stagefright/foundation/AHandlerReflector.h>
#include <utils/RefBase.h>
#include <utils/threads.h>
#include "aah_tx_packet.h"
#include "pipe_event.h"
namespace android {
template <typename T> class CircularBuffer {
public:
CircularBuffer(size_t capacity);
~CircularBuffer();
void push_back(const T& item);;
void pop_front();
size_t size() const;
bool isFull() const;
bool isEmpty() const;
const T& itemAt(size_t index) const;
const T& operator[](size_t index) const;
private:
T* mBuffer;
size_t mCapacity;
size_t mHead;
size_t mTail;
size_t mFillCount;
DISALLOW_EVIL_CONSTRUCTORS(CircularBuffer);
};
class AAH_TXSender : public virtual RefBase {
public:
~AAH_TXSender();
static sp<AAH_TXSender> GetInstance();
ALooper::handler_id handlerID() { return mReflector->id(); }
// an IP address and port
struct Endpoint {
Endpoint();
Endpoint(uint32_t a, uint16_t p);
bool operator<(const Endpoint& other) const;
uint32_t addr;
uint16_t port;
};
uint16_t registerEndpoint(const Endpoint& endpoint);
void unregisterEndpoint(const Endpoint& endpoint);
enum {
kWhatSendPacket,
kWhatTrimRetryBuffers,
kWhatSendHeartbeats,
};
// fields for SendPacket messages
static const char* kSendPacketIPAddr;
static const char* kSendPacketPort;
static const char* kSendPacketTRTPPacket;
private:
AAH_TXSender();
static Mutex sLock;
static wp<AAH_TXSender> sInstance;
static uint32_t sNextEpoch;
static bool sNextEpochValid;
static uint32_t getNextEpoch();
typedef CircularBuffer<sp<TRTPPacket> > RetryBuffer;
// state maintained on a per-endpoint basis
struct EndpointState {
EndpointState(uint32_t epoch);
RetryBuffer retry;
int playerRefCount;
uint16_t trtpSeqNumber;
uint16_t nextProgramID;
uint32_t epoch;
};
friend class AHandlerReflector<AAH_TXSender>;
void onMessageReceived(const sp<AMessage>& msg);
void onSendPacket(const sp<AMessage>& msg);
void doSendPacket_l(const sp<TRTPPacket>& packet,
const Endpoint& endpoint);
void trimRetryBuffers();
void sendHeartbeats();
bool shouldSendHeartbeats_l();
sp<ALooper> mLooper;
sp<AHandlerReflector<AAH_TXSender> > mReflector;
int mSocket;
nsecs_t mLastSentPacketTime;
DefaultKeyedVector<Endpoint, EndpointState*> mEndpointMap;
Mutex mEndpointLock;
static const int kRetryTrimIntervalUs;
static const int kHeartbeatIntervalUs;
static const int kRetryBufferCapacity;
static const nsecs_t kHeartbeatTimeout;
class RetryReceiver : public Thread {
private:
friend class AAH_TXSender;
RetryReceiver(AAH_TXSender* sender);
virtual ~RetryReceiver();
virtual bool threadLoop();
void handleRetryRequest();
static const int kMaxReceiverPacketLen;
static const uint32_t kRetryRequestID;
static const uint32_t kFastStartRequestID;
static const uint32_t kRetryNakID;
AAH_TXSender* mSender;
PipeEvent mWakeupEvent;
};
sp<RetryReceiver> mRetryReceiver;
DISALLOW_EVIL_CONSTRUCTORS(AAH_TXSender);
};
struct RetryPacket {
uint32_t id;
uint32_t endpointIP;
uint16_t endpointPort;
uint16_t seqStart;
uint16_t seqEnd;
} __attribute__((packed));
} // namespace android
#endif // __AAH_TX_SENDER_H__
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