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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 <TextRtpPayloadDecoderNode.h>
#include <TextConfig.h>
#include <ImsMediaTrace.h>
#include <list>
TextRtpPayloadDecoderNode::TextRtpPayloadDecoderNode(BaseSessionCallback* callback) :
BaseNode(callback)
{
mCodecType = TextConfig::TEXT_CODEC_NONE;
}
TextRtpPayloadDecoderNode::~TextRtpPayloadDecoderNode() {}
kBaseNodeId TextRtpPayloadDecoderNode::GetNodeId()
{
return kNodeIdTextPayloadDecoder;
}
ImsMediaResult TextRtpPayloadDecoderNode::Start()
{
IMLOGD1("[Start] codec[%d]", mCodecType);
if (mCodecType == TextConfig::TEXT_CODEC_NONE)
{
return RESULT_INVALID_PARAM;
}
mNodeState = kNodeStateRunning;
return RESULT_SUCCESS;
}
void TextRtpPayloadDecoderNode::Stop()
{
IMLOGD0("[Stop]");
mNodeState = kNodeStateStopped;
}
bool TextRtpPayloadDecoderNode::IsRunTime()
{
return true;
}
bool TextRtpPayloadDecoderNode::IsSourceNode()
{
return false;
}
void TextRtpPayloadDecoderNode::OnDataFromFrontNode(ImsMediaSubType subtype, uint8_t* data,
uint32_t size, uint32_t timestamp, bool mark, uint32_t seqNum, ImsMediaSubType dataType,
uint32_t arrivalTime)
{
(void)dataType;
(void)arrivalTime;
if (subtype == MEDIASUBTYPE_REFRESHED)
{
SendDataToRearNode(subtype, nullptr, size, 0, 0, 0, MEDIASUBTYPE_UNDEFINED);
return;
}
switch (mCodecType)
{
case TextConfig::TEXT_T140:
case TextConfig::TEXT_T140_RED:
DecodeT140(data, size, subtype, timestamp, mark, seqNum);
break;
default:
IMLOGE1("[OnDataFromFrontNode invalid codec type[%u]", mCodecType);
break;
}
}
void TextRtpPayloadDecoderNode::SetConfig(void* config)
{
if (config == nullptr)
{
return;
}
TextConfig* pConfig = reinterpret_cast<TextConfig*>(config);
mCodecType = pConfig->getCodecType();
}
bool TextRtpPayloadDecoderNode::IsSameConfig(void* config)
{
if (config == nullptr)
{
return true;
}
TextConfig* pConfig = reinterpret_cast<TextConfig*>(config);
return (mCodecType == pConfig->getCodecType());
}
void TextRtpPayloadDecoderNode::DecodeT140(uint8_t* data, uint32_t size, ImsMediaSubType subtype,
uint32_t timestamp, bool mark, uint32_t seq)
{
IMLOGD_PACKET5(IM_PACKET_LOG_PH,
"[DecodeT140] subtype[%u], size[%u], timestamp[%d], mark[%d], seq[%d]", subtype, size,
timestamp, mark, seq);
if (subtype == MEDIASUBTYPE_BITSTREAM_T140 || subtype == MEDIASUBTYPE_BITSTREAM_T140_RED)
{
std::list<uint32_t> listTimestampOffset;
std::list<uint32_t> listLength;
uint32_t readByte = 0;
uint16_t redundantCount = 0;
mBitReader.SetBuffer(data, size);
/*
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1| T140 PT | timestamp offset of "R" | "R" block length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0| T140 PT | "R" T.140 encoded redundant data |
+-+-+-+-+-+-+-+-+ +---------------+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
// Primary Data Only
if (subtype == MEDIASUBTYPE_BITSTREAM_T140)
{
SendDataToRearNode(MEDIASUBTYPE_BITSTREAM_T140, data, size, timestamp, mark, seq);
return;
}
// Redundant data included
while (mBitReader.Read(1) == 1) // redundant flag bit
{
uint32_t payloadType = mBitReader.Read(7); // T140 payload type
uint32_t timestampOffset = mBitReader.Read(14);
uint32_t length = mBitReader.Read(10);
listTimestampOffset.push_back(timestampOffset); // timestamp offset
listLength.push_back(length); // block length
IMLOGD_PACKET3(IM_PACKET_LOG_PH, "[DecodeT140] PT[%u], TSOffset[%u], size[%u]",
payloadType, timestampOffset, length);
readByte += 4;
redundantCount++;
}
mBitReader.Read(7); // T140 payload type (111)
readByte += 1;
// redundant data
while (listTimestampOffset.size() > 0)
{
uint32_t redundantTimestamp = listTimestampOffset.front();
uint32_t redundantLength = listLength.front();
// read redundant payload
mBitReader.ReadByteBuffer(mPayload, redundantLength * 8);
readByte += redundantLength;
uint16_t redundantSeqNum = seq - redundantCount;
IMLOGD_PACKET3(IM_PACKET_LOG_PH, "[DecodeT140] red TS[%u], size[%u], seq[%u]",
timestamp - redundantTimestamp, redundantLength, redundantSeqNum);
SendDataToRearNode(MEDIASUBTYPE_BITSTREAM_T140, mPayload, redundantLength,
timestamp - redundantTimestamp, mark, redundantSeqNum);
redundantCount--;
listTimestampOffset.pop_front();
listLength.pop_front();
}
// primary data
if (size - readByte > 0)
{
mBitReader.ReadByteBuffer(mPayload, (size - readByte) * 8);
}
SendDataToRearNode(
MEDIASUBTYPE_BITSTREAM_T140, mPayload, (size - readByte), timestamp, mark, seq);
}
else
{
IMLOGW1("[DecodeT140] INVALID media sub type[%u]", subtype);
}
}
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