author | William Roberts <williamr@symbian.org> |
Fri, 11 Jun 2010 16:24:40 +0100 | |
branch | GCC_SURGE |
changeset 34 | a206027c856a |
parent 0 | f63038272f30 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Contains an implementation of CBTAudioStreamSenderSBC class. |
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* |
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*/ |
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|
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|
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#include "btaudiostreamsendersbc.h" |
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#include "btaudiostreamerdebug.h" |
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const TInt KA2DPMediaPacketHeaderLength = 1; |
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const TInt KA2DPMediaPacketHeaderIndex = 0; |
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const TInt KRTPHeaderLength = 12; |
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// ======== MEMBER FUNCTIONS ======== |
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// --------------------------------------------------------------------------- |
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// Constructor. |
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// --------------------------------------------------------------------------- |
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// |
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CBTAudioStreamSenderSBC::CBTAudioStreamSenderSBC(MBTAudioStreamSenderObserver& aObserver, RRtpSession& aSession): |
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CBTAudioStreamSender(aObserver, aSession) |
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{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::CBTAudioStreamSenderSBC() ->"))); |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::CBTAudioStreamSenderSBC() <-"))); |
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} |
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// --------------------------------------------------------------------------- |
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// Factory method. |
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// --------------------------------------------------------------------------- |
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// |
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/*static*/ CBTAudioStreamSenderSBC* CBTAudioStreamSenderSBC::NewL(MBTAudioStreamSenderObserver& aObserver, RRtpSession& aSession) |
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{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::NewL() ->"))); |
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CBTAudioStreamSenderSBC* self = new (ELeave) CBTAudioStreamSenderSBC(aObserver, aSession); |
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CleanupStack::PushL(self); |
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self->ConstructL(); |
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CleanupStack::Pop(self); |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::NewL() <-"))); |
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return self; |
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} |
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// --------------------------------------------------------------------------- |
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// Destructor. |
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// --------------------------------------------------------------------------- |
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// |
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CBTAudioStreamSenderSBC::~CBTAudioStreamSenderSBC() |
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{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::~CBTAudioStreamSenderSBC() ->"))); |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::~CBTAudioStreamSenderSBC() <-"))); |
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} |
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// --------------------------------------------------------------------------- |
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// From class CBTAudioStreamSender. |
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// This method stores the frames to the frame buffer and |
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// when we have enough frames. |
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// --------------------------------------------------------------------------- |
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// |
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TInt CBTAudioStreamSenderSBC::AddHeaderToSendPacket(TPtr8& aPayloadDesC) |
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{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::AddHeaderToSendPacket() ->"))); |
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aPayloadDesC[KA2DPMediaPacketHeaderIndex] = iNumOfFramesInSendPacket; |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::AddHeaderToSendPacket() <-"))); |
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return KErrNone; |
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} |
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// --------------------------------------------------------------------------- |
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// From class CBTAudioStreamSender. |
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// This method stores the frames to the frame buffer and |
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// when we have enough frames. |
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// --------------------------------------------------------------------------- |
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// |
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TInt CBTAudioStreamSenderSBC::AddBufferToSendPacket(const TDesC8& aBuffer) |
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{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::AddBufferToSendPacket() ->"))); |
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// Copy data from the buffer to the outgoing packet. |
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// The return code means how many frames can still fit in the SendPacket. |
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// - If there's more space, the value > 0. In this case we need more data. |
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// - If the buffer is full and all data was consumed, the value == 0. In this case the packet must be sent. |
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// - If the buffer is full and all data didn't fit in it, the value < 0. The packet must be sent and this method called again with the same frame. |
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// Calculate how many frames there's left in the buffer. Note that iFrameLength must always be greater than zero. |
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TInt numOfFramesLeftInBuffer = (aBuffer.Length() / iFrameLength) - iNumOfFramesAlreadyMoved ; |
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// If the whole buffer can fit in packet, move it completely, otherwise move as many frames as can fit. |
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TInt numOfFramesToMove = numOfFramesLeftInBuffer <= iMaxNumOfFrames - iNumOfFramesInSendPacket ? |
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numOfFramesLeftInBuffer : |
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100 |
iMaxNumOfFrames - iNumOfFramesInSendPacket; |
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|
101 |
|
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102 |
// Some traces for seeing what's going on. |
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|
103 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t Filling sendpacket..."))); |
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|
104 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t %d frames can fit in packet."), iMaxNumOfFrames)); |
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|
105 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t %d frames have already been moved from current buffer to sendpacket."), iNumOfFramesAlreadyMoved)); |
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|
106 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t %d frames left to move from current buffer."), numOfFramesLeftInBuffer)); |
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|
107 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t %d frames already in current packet."), iNumOfFramesInSendPacket)); |
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|
108 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t => Moving %d frames."), numOfFramesToMove)); |
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|
109 |
|
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110 |
// Move the number of frames calculated above to the packet: |
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|
111 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t replacing sendpacket content from %d, length is %d..."), KA2DPMediaPacketHeaderLength + iNumOfFramesInSendPacket * iFrameLength, numOfFramesToMove * iFrameLength)); |
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|
112 |
|
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113 |
// Make the ptrNextFrameInBuffer point to the first frame that hasn't been moved. |
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114 |
const TUint8 * ptrNextFrameInBuffer = aBuffer.Ptr() + iNumOfFramesAlreadyMoved * iFrameLength; |
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|
115 |
memcpy((void *)iPtrEndOfPayload, (void *)ptrNextFrameInBuffer, numOfFramesToMove * iFrameLength); |
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116 |
iPtrEndOfPayload += numOfFramesToMove * iFrameLength; |
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ptrNextFrameInBuffer += numOfFramesToMove * iFrameLength; |
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|
118 |
|
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119 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t %d frames moved from buffer to packet."), numOfFramesToMove)); |
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120 |
|
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121 |
// If we have now moved them all, reset the counter, otherwise update it for the next round. |
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iNumOfFramesAlreadyMoved = numOfFramesLeftInBuffer == numOfFramesToMove ? 0 : iNumOfFramesAlreadyMoved + numOfFramesToMove; |
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|
123 |
|
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124 |
// update the information needed for building the header later (in sending phase): |
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125 |
iNumOfFramesInSendPacket += numOfFramesToMove; |
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|
126 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t iNumOfFramesInSendPacket incremented, it is now %d"), iNumOfFramesInSendPacket)); |
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127 |
|
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128 |
numOfFramesLeftInBuffer -= numOfFramesToMove; |
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|
129 |
|
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130 |
// return the number of frames that will still fit in the packet: |
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131 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t returning: %d"), iMaxNumOfFrames - iNumOfFramesInSendPacket - numOfFramesLeftInBuffer)); |
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132 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::AddBufferToSendPacket() <-"))); |
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133 |
return (iMaxNumOfFrames - iNumOfFramesInSendPacket - numOfFramesLeftInBuffer); |
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134 |
} |
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135 |
|
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136 |
// --------------------------------------------------------------------------- |
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137 |
// From class CBTAudioStreamSender. |
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138 |
// This method stores the frames to the frame buffer and |
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// when we have enough frames. |
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140 |
// --------------------------------------------------------------------------- |
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141 |
// |
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142 |
TInt CBTAudioStreamSenderSBC::PacketSendingCompleted(TPtr8& aPayloadDesC) |
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143 |
{ |
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144 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::PacketSendingCompleted() ->"))); |
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iNumOfFramesInSendPacket = 0; |
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146 |
iPtrEndOfPayload = aPayloadDesC.Ptr() + KA2DPMediaPacketHeaderLength; |
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147 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::PacketSendingCompleted() <-"))); |
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148 |
return KErrNone; |
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149 |
} |
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|
150 |
|
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151 |
// --------------------------------------------------------------------------- |
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152 |
// From class CBTAudioStreamSender. |
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153 |
// This method sets up the sender and calculates the required packet |
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154 |
// length according to its own implementation. |
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155 |
// --------------------------------------------------------------------------- |
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156 |
// |
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157 |
TInt CBTAudioStreamSenderSBC::InitSender(RRtpSendPacket& aSendPacket, TPtr8& aPayloadDesC, const TUint aTargetBitrate) |
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|
158 |
{ |
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|
159 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::InitSender() ->"))); |
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|
160 |
iFrameLength = iNewFrameLength; |
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|
161 |
iMaxNumOfFrames = iSpaceNeededForBuffer / iFrameLength; |
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|
162 |
|
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163 |
// Make the descriptor point in the beginning of the send packet. |
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164 |
aPayloadDesC.Set(const_cast<TUint8*>(aSendPacket.WritePayload().Ptr()), iSpaceNeededForBuffer, iSpaceNeededForBuffer); |
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|
165 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t Descriptor inited, space needed: %d bytes."), iSpaceNeededForBuffer)); |
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|
166 |
|
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|
167 |
iPtrEndOfPayload = aPayloadDesC.Ptr() + KA2DPMediaPacketHeaderLength; |
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|
168 |
|
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|
169 |
iNumOfFramesInSendPacket = 0; |
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|
170 |
|
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171 |
iTimestampOfFirstFrameInSendPacket = 0; |
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|
172 |
|
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173 |
iDurationOfFrame = CalculateFrameDuration(iFrameLength, aTargetBitrate); |
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|
174 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t iDurationOfFrame: %d"), iDurationOfFrame)); |
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|
175 |
|
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|
176 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::InitSender() <-"))); |
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|
177 |
return KErrNone; |
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|
178 |
} |
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|
179 |
|
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180 |
TInt CBTAudioStreamSenderSBC::CalculatePacketLength(TUint aOutboundMTUSize, const TUint aFrameLength) |
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|
181 |
{ |
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|
182 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::CalculatePacketLength() <-"))); |
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|
183 |
if(aFrameLength > 0) // Must not be zero, and cannot be according to A2DP spec. |
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|
184 |
{ |
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185 |
iNewFrameLength = aFrameLength; |
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|
186 |
|
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187 |
iSpaceNeededForBuffer = ((aOutboundMTUSize - KA2DPMediaPacketHeaderLength - KRTPHeaderLength) / iNewFrameLength) * iNewFrameLength + KA2DPMediaPacketHeaderLength; |
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|
188 |
|
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|
189 |
BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::CalculatePacketLength() <-"))); |
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|
190 |
return iSpaceNeededForBuffer; |
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|
191 |
} |
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192 |
else |
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|
193 |
{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t Length parameter is zero!"))); |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::CalculatePacketLength() <-"))); |
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return 0; |
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} |
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} |
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TUint CBTAudioStreamSenderSBC::CalculateFrameDuration(const TUint aFrameLength, const TUint aTargetBitrate) |
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{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::CalculateFrameInterval() ->"))); |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::CalculateFrameInterval() <-"))); |
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return static_cast<TUint>(static_cast<TReal>(aFrameLength * 8) / static_cast<TReal>(aTargetBitrate) * 1000000.0); |
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} |
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TUint CBTAudioStreamSenderSBC::MaxFramesPerPacket() |
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{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::FramesPerPacket() ->"))); |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::FramesPerPacket() <-"))); |
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return iMaxNumOfFrames; |
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} |
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void CBTAudioStreamSenderSBC::AdjustTimestamp(TInt64& aTimestamp) |
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{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::AdjustTimestamp() ->"))); |
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// The buffer has been emptied, but there may be space for additional frames in sendpacket. |
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// So keep the current timestamp until the sendpacket becomes full. |
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if(iNumOfFramesAlreadyMoved == 0) |
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{ |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t Buffer became empty."))); |
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iTimestampChangeFlag = ETrue; |
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} |
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|
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if(iNumOfFramesInSendPacket == iMaxNumOfFrames) // Adjust the timestamp only when the sendpacket is full. |
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{ |
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if(iTimestampChangeFlag != EFalse) |
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{ |
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// When the buffer been emptied earlier, take the new timestamp into use and adjust it by the amount of frames we just moved. |
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iTimestampOfFirstFrameInSendPacket = aTimestamp + iDurationOfFrame * iNumOfFramesAlreadyMoved; |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t New timestamp %d (low) is in use."), I64LOW(aTimestamp))); |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t New timestamp %d (high) is in use."), I64HIGH(aTimestamp))); |
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iTimestampChangeFlag = EFalse; |
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} |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t Timestamp is %d (low)"), I64LOW(iTimestampOfFirstFrameInSendPacket))); |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FPrint(_L("[BTAudioStreamer]\t Timestamp is %d (high)"), I64HIGH(iTimestampOfFirstFrameInSendPacket))); |
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|
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// Use the timestamp first and then do a normal adjustment for the next round. |
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aTimestamp = iTimestampOfFirstFrameInSendPacket; |
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iTimestampOfFirstFrameInSendPacket = iTimestampOfFirstFrameInSendPacket + iMaxNumOfFrames * iDurationOfFrame; |
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} |
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BT_AUDIO_STREAMER_TRACE_OPT( KPRINTFTRACE, FLOG(_L("[BTAudioStreamer]\t CBTAudioStreamSenderSBC::AdjustTimestamp() <-"))); |
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} |