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/**
* Copyright (C) 2022 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.
*/
#include <TextRendererNode.h>
#include <TextConfig.h>
#include <ImsMediaTimer.h>
#include <ImsMediaTrace.h>
/** Maximum waiting time when packet loss found */
#define TEXT_LOSS_MAX_WAITING_TIME (1000)
TextRendererNode::TextRendererNode(BaseSessionCallback* callback) :
JitterBufferControlNode(callback, IMS_MEDIA_TEXT)
{
mCodecType = TextConfig::TEXT_CODEC_NONE;
mBOMReceived = false;
mLastPlayedSeq = 0;
mLossWaitTime = 0;
mFirstFrameReceived = false;
}
TextRendererNode::~TextRendererNode() {}
kBaseNodeId TextRendererNode::GetNodeId()
{
return kNodeIdTextRenderer;
}
ImsMediaResult TextRendererNode::Start()
{
IMLOGD1("[Start] codec[%d]", mCodecType);
if (mCodecType == TextConfig::TEXT_CODEC_NONE)
{
return RESULT_INVALID_PARAM;
}
mBOMReceived = false;
mLastPlayedSeq = 0;
mLossWaitTime = 0;
mFirstFrameReceived = false;
mNodeState = kNodeStateRunning;
return RESULT_SUCCESS;
}
void TextRendererNode::Stop()
{
IMLOGD0("[Stop]");
mNodeState = kNodeStateStopped;
}
bool TextRendererNode::IsRunTime()
{
return false;
}
bool TextRendererNode::IsSourceNode()
{
return false;
}
void TextRendererNode::SetConfig(void* config)
{
if (config == nullptr)
{
return;
}
TextConfig* pConfig = reinterpret_cast<TextConfig*>(config);
mCodecType = pConfig->getCodecType();
mRedundantLevel = pConfig->getRedundantLevel();
}
bool TextRendererNode::IsSameConfig(void* config)
{
if (config == nullptr)
{
return true;
}
TextConfig* pConfig = reinterpret_cast<TextConfig*>(config);
return (mCodecType == pConfig->getCodecType() &&
mRedundantLevel == pConfig->getRedundantLevel());
}
void TextRendererNode::ProcessData()
{
static const char* CHAR_REPLACEMENT = "\xEf\xbf\xbd";
uint8_t* data;
uint32_t size;
uint32_t timestamp;
uint32_t seq;
bool mark;
ImsMediaSubType subtype;
ImsMediaSubType dataType;
while (GetData(&subtype, &data, &size, ×tamp, &mark, &seq, &dataType))
{
IMLOGD_PACKET5(IM_PACKET_LOG_TEXT,
"[ProcessData] size[%u], TS[%u], mark[%u], seq[%u], last seq[%u]", size, timestamp,
mark, seq, mLastPlayedSeq);
if (mFirstFrameReceived)
{
// detect lost packet
uint16_t seqDiff = (uint16_t)seq - mLastPlayedSeq;
if (seqDiff > 1) // lost found
{
// Wait 1000 sec - RFC4103: 5.4 - Compensation for Packets Out of Order
uint32_t nCurTime = ImsMediaTimer::GetTimeInMilliSeconds();
if (mLossWaitTime == 0)
{
mLossWaitTime = nCurTime;
}
if (nCurTime - mLossWaitTime <= TEXT_LOSS_MAX_WAITING_TIME)
{
return;
}
int32_t lostCount = seqDiff - 1;
IMLOGD1("[ProcessData] lostCount[%d]", lostCount);
// Send a lost T140 as question mark
for (int32_t nIndex = 1; nIndex <= lostCount; nIndex++)
{
// send replacement character in case of lost packet detected
android::String8* text = new android::String8(CHAR_REPLACEMENT);
mCallback->SendEvent(
kImsMediaEventNotifyRttReceived, reinterpret_cast<uint64_t>(text), 0);
uint16_t lostSeq = mLastPlayedSeq + (uint16_t)nIndex;
IMLOGD_PACKET1(IM_PACKET_LOG_TEXT, "[ProcessData] LostSeq[%u]", lostSeq);
}
}
mLossWaitTime = 0; // reset loss wait
}
int32_t offset = size;
uint8_t* dataPtr = data;
// remove BOM from the string and send event
while (offset > 0)
{
// remain last null data
uint32_t transSize = 0;
offset > MAX_RTT_LEN ? transSize = MAX_RTT_LEN : transSize = offset;
if (mBOMReceived == false && offset >= 3 && dataPtr[0] == 0xef && dataPtr[1] == 0xbb &&
dataPtr[2] == 0xbf)
{
IMLOGD0("[ProcessData] got byte order mark");
mBOMReceived = true;
dataPtr += 3;
transSize -= 3;
offset -= 3;
}
// send event to notify to transfer rtt data received
if (transSize > 0)
{
memset(mBuffer, 0, sizeof(mBuffer));
memcpy(mBuffer, dataPtr, transSize);
android::String8* text = new android::String8(mBuffer);
mCallback->SendEvent(
kImsMediaEventNotifyRttReceived, reinterpret_cast<uint64_t>(text), 0);
IMLOGD_PACKET2(
IM_PACKET_LOG_TEXT, "[ProcessData] size[%d] text[%s]", transSize, mBuffer);
}
dataPtr += transSize;
offset -= transSize;
}
mFirstFrameReceived = true;
mLastPlayedSeq = (uint16_t)seq;
DeleteData();
}
}
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