mirror of
https://github.com/TorqueGameEngines/Torque3D.git
synced 2026-01-20 20:54:46 +00:00
118 lines
4 KiB
C++
118 lines
4 KiB
C++
//-----------------------------------------------------------------------------
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// Copyright (c) 2012 GarageGames, LLC
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//-----------------------------------------------------------------------------
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#include "sfx/sfxMemoryStream.h"
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#include "platform/typetraits.h"
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#include "console/console.h"
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SFXMemoryStream::SFXMemoryStream( const SFXFormat& format,
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SourceStreamType* stream,
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U32 numSamples )
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: IInputStreamFilter< U8, SourceStreamType* >( stream ),
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mFormat( format ),
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mNumSamplesTotal( numSamples ),
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mNumSamplesLeft( numSamples ),
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mCurrentPacket( NULL ),
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mCurrentPacketOffset( 0 )
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{
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}
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void SFXMemoryStream::reset()
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{
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if( dynamic_cast< IResettable* >( getSourceStream() ) )
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{
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reinterpret_cast< IResettable* >( getSourceStream() )->reset();
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if( mCurrentPacket )
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destructSingle( mCurrentPacket );
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mCurrentPacket = NULL;
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mCurrentPacketOffset = 0;
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mNumSamplesLeft = mNumSamplesTotal;
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}
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else
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Con::errorf( "SFXMemoryStream - cannot reset source stream" );
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}
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U32 SFXMemoryStream::read( U8* buffer, U32 length )
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{
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U32 bufferOffset = 0;
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// Determine how much we're supposed to read.
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U32 numBytesToCopy = length;
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if( mNumSamplesLeft != U32_MAX )
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numBytesToCopy = getMin( length, mNumSamplesLeft * mFormat.getBytesPerSample() );
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numBytesToCopy -= numBytesToCopy % mFormat.getBytesPerSample();
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// Copy the data.
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U32 numBytesLeftToCopy = numBytesToCopy;
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while( numBytesLeftToCopy )
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{
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// If we have a current packet, use its data.
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if( mCurrentPacket )
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{
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U32 numBytesLeftInCurrentPacket = mCurrentPacket->size - mCurrentPacketOffset;
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// Copy data.
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if( numBytesLeftInCurrentPacket )
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{
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const U32 numBytesToCopy = getMin( numBytesLeftInCurrentPacket, numBytesLeftToCopy );
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dMemcpy( &buffer[ bufferOffset ], &mCurrentPacket->data[ mCurrentPacketOffset ], numBytesToCopy );
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bufferOffset += numBytesToCopy;
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mCurrentPacketOffset += numBytesToCopy;
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numBytesLeftInCurrentPacket -= numBytesToCopy;
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numBytesLeftToCopy -= numBytesToCopy;
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}
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// Discard the packet if there's no data left.
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if( !numBytesLeftInCurrentPacket )
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{
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destructSingle( mCurrentPacket );
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mCurrentPacket = NULL;
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mCurrentPacketOffset = 0;
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}
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}
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else
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{
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// Read a new packet.
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if( !getSourceStream()->read( &mCurrentPacket, 1 ) )
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break;
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}
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}
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// Update count of remaining samples.
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U32 numBytesCopied = numBytesToCopy - numBytesLeftToCopy;
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if( mNumSamplesLeft != U32_MAX )
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mNumSamplesLeft -= ( numBytesCopied / mFormat.getBytesPerSample() );
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return numBytesCopied;
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}
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