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| author | 2011-01-01 20:19:56 +0000 | |
|---|---|---|
| committer | 2011-01-01 20:19:56 +0000 | |
| commit | c601b5a27f74b16158adafe429faefbe573e64a2 (patch) | |
| tree | a3cde3206a45628f8ac86e8dfbdab70b20c3a831 /src/modules/dcc/adpcmcodec.cpp | |
| parent | probable compilation fix for rijndaled/crypto++ (diff) | |
| download | KVIrc-c601b5a27f74b16158adafe429faefbe573e64a2.tar.gz KVIrc-c601b5a27f74b16158adafe429faefbe573e64a2.tar.bz2 KVIrc-c601b5a27f74b16158adafe429faefbe573e64a2.zip | |
The big rename for modules. Still some details remaining.
git-svn-id: https://svn.kvirc.de/svn/trunk/kvirc@5284 17fca916-40b9-46aa-a4ea-0a15b648b75c
Diffstat (limited to 'src/modules/dcc/adpcmcodec.cpp')
| -rw-r--r-- | src/modules/dcc/adpcmcodec.cpp | 306 |
1 files changed, 0 insertions, 306 deletions
diff --git a/src/modules/dcc/adpcmcodec.cpp b/src/modules/dcc/adpcmcodec.cpp deleted file mode 100644 index 4e9f45f13..000000000 --- a/src/modules/dcc/adpcmcodec.cpp +++ /dev/null @@ -1,306 +0,0 @@ -//============================================================================= -// -// File : adpcmcodec.h -// Creation date : Wed Aug 22 19:12:46 2001 GMT by Szymon Stefanek -// -// This file is part of the KVIrc irc client distribution -// Copyright (C) 2001-2010 Szymon Stefanek (pragma at kvirc dot net) -// -// This program is FREE software. You can redistribute it and/or -// modify it under the terms of the GNU General Public License -// as published by the Free Software Foundation; either version 2 -// of the License, or (at your opinion) any later version. -// -// This program is distributed in the HOPE that it will be USEFUL, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -// See the GNU General Public License for more details. -// -// You should have received a copy of the GNU General Public License -// along with this program. If not, write to the Free Software Foundation, -// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. -// -//============================================================================= -// -// Copyright 1992 by Stichting Mathematisch Centrum, Amsterdam, The Netherlands. -// All Rights Reserved -// -// Permission to use, copy, modify, and distribute this software and its -// documentation for any purpose and without fee is hereby granted, -// provided that the above copyright notice appear in all copies and that -// both that copyright notice and this permission notice appear in -// supporting documentation, and that the names of Stichting Mathematisch -// Centrum or CWI not be used in advertising or publicity pertaining to -// distribution of the software without specific, written prior permission. -// -// STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO -// THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND -// FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE -// FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES -// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN -// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT -// OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -// -// -// Intel/DVI ADPCM coder/decoder. -// -// The algorithm for this coder was taken from the IMA Compatability Project -// proceedings, Vol 2, Number 2; May 1992. -// -// Version 1.2, 18-Dec-92. -// - -#define _ADPCMCODEC_CPP_ -#include "adpcmcodec.h" - -#include <stdio.h> /*DBG*/ - -#ifndef __STDC__ - #define signed -#endif - - - -#define ADPCM_PACKED_FRAME_SIZE_IN_BYTES 512 -#define ADPCM_UNPACKED_FRAME_SIZE_IN_BYTES 2048 -#define ADPCM_UNPACKED_FRAME_SIZE_IN_SHORTS 1024 - -// Intel ADPCM step variation table */ -static int indexTable[16] = { - -1, -1, -1, -1, 2, 4, 6, 8, - -1, -1, -1, -1, 2, 4, 6, 8, -}; - -static int stepsizeTable[89] = { - 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, - 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, - 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, - 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, - 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, - 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, - 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, - 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, - 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 -}; - -void ADPCM_compress(short indata[],char outdata[],int len,ADPCM_state *state) -{ - short *lpIn; /* Input buffer pointer */ - signed char *lpOut; /* output buffer pointer */ - int val; /* Current input sample value */ - int sign; /* Current adpcm sign bit */ - int delta; /* Current adpcm output value */ - int diff; /* Difference between val and valprev */ - int step; /* Stepsize */ - int valpred; /* Predicted output value */ - int vpdiff; /* Current change to valpred */ - int index; /* Current step change index */ - int outputbuffer = 0; /* place to keep previous 4-bit value */ - int bufferstep; /* toggle between outputbuffer/output */ - - lpOut = (signed char *)outdata; - lpIn = indata; - - valpred = state->valprev; - index = state->index; - step = stepsizeTable[index]; - - bufferstep = 1; - - for ( ;len > 0;len-- ) { - val = *lpIn++; - // Step 1 - compute difference with previous value - diff = val - valpred; - sign = (diff < 0) ? 8 : 0; - if(sign)diff=(-diff); - // Step 2 - Divide and clamp - // Note: - // This code *approximately* computes: - // delta = diff*4/step; - // vpdiff = (delta+0.5)*step/4; - // but in shift step bits are dropped. The net result of this is - // that even if you have fast mul/div hardware you cannot put it to - // good use since the fixup would be too expensive. - // - delta = 0; - vpdiff = (step >> 3); - if (diff >=step){ - delta = 4; - diff -= step; - vpdiff += step; - } - step >>= 1; - if (diff >= step) { - delta |= 2; - diff -= step; - vpdiff += step; - } - step >>= 1; - if ( diff >= step ) { - delta |= 1; - vpdiff += step; - } - // Step 3 - Update previous value - if(sign)valpred -= vpdiff; - else valpred += vpdiff; - // Step 4 - Clamp previous value to 16 bits - if ( valpred > 32767 )valpred = 32767; - else if ( valpred < -32768 )valpred = -32768; - // Step 5 - Assemble value, update index and step values - delta |= sign; - index += indexTable[delta]; - if ( index < 0 ) index = 0; - if ( index > 88 ) index = 88; - step = stepsizeTable[index]; - // Step 6 - Output value - if ( bufferstep )outputbuffer = (delta << 4) & 0xf0; - else *lpOut++ = (delta & 0x0f) | outputbuffer; - bufferstep = !bufferstep; - } - // Output last step, if needed - if (!bufferstep)*lpOut++ = outputbuffer; - state->valprev = valpred; - state->index = index; -} - -void ADPCM_uncompress(char indata[],short outdata[],int len,ADPCM_state *state) -{ - signed char *inp; /* Input buffer pointer */ - short *outp; /* output buffer pointer */ - int sign; /* Current adpcm sign bit */ - int delta; /* Current adpcm output value */ - int step; /* Stepsize */ - int valpred; /* Predicted value */ - int vpdiff; /* Current change to valpred */ - int index; /* Current step change index */ - int inputbuffer=0; /* place to keep next 4-bit value */ - int bufferstep; /* toggle between inputbuffer/input */ - - outp = outdata; - inp = (signed char *)indata; - - valpred = state->valprev; - index = state->index; - step = stepsizeTable[index]; - - bufferstep = 0; - - for ( ; len > 0 ; len-- ) { - /* Step 1 - get the delta value */ - if ( bufferstep )delta = inputbuffer & 0xf; - else { - inputbuffer = *inp++; - delta = (inputbuffer >> 4) & 0xf; - } - bufferstep = !bufferstep; - - /* Step 2 - Find new index value (for later) */ - index += indexTable[delta]; - if ( index < 0 ) index = 0; - if ( index > 88 ) index = 88; - - /* Step 3 - Separate sign and magnitude */ - sign = delta & 8; - delta = delta & 7; - - /* Step 4 - Compute difference and new predicted value */ - /* - ** Computes 'vpdiff = (delta+0.5)*step/4', but see comment - ** in adpcm_coder. - */ - vpdiff = step >> 3; - if( delta & 4 )vpdiff += step; - if( delta & 2 )vpdiff += step>>1; - if( delta & 1 )vpdiff += step>>2; - - if(sign)valpred -= vpdiff; - else valpred += vpdiff; - - /* Step 5 - clamp output value */ - if(valpred > 32767)valpred = 32767; - else if(valpred < -32768)valpred = -32768; - - /* Step 6 - Update step value */ - step = stepsizeTable[index]; - - /* Step 7 - Output value */ - *outp++ = valpred; - } - - state->valprev = valpred; - state->index = index; -} - - -KviDccVoiceAdpcmCodec::KviDccVoiceAdpcmCodec() -: KviDccVoiceCodec() -{ - m_pEncodeState = new ADPCM_state; - m_pEncodeState->index = 0; - m_pEncodeState->valprev = 0; - m_pDecodeState = new ADPCM_state; - m_pDecodeState->index = 0; - m_pDecodeState->valprev = 0; - m_szName = "adpcm (compression 1:4)"; -} - -KviDccVoiceAdpcmCodec::~KviDccVoiceAdpcmCodec() -{ - delete m_pEncodeState; - delete m_pDecodeState; -} - -void KviDccVoiceAdpcmCodec::encode(KviDataBuffer * signal,KviDataBuffer * stream) -{ - if(signal->size() < ADPCM_UNPACKED_FRAME_SIZE_IN_BYTES)return; // nothing to encode - - char * ptr = (char *)signal->data(); - - int uFrames = signal->size() / ADPCM_UNPACKED_FRAME_SIZE_IN_BYTES; - int uTotalDataCompressed = uFrames * ADPCM_UNPACKED_FRAME_SIZE_IN_BYTES; - int uFrameOffset = stream->size(); - char * endPtr = ptr + uTotalDataCompressed; - - stream->addSize(ADPCM_PACKED_FRAME_SIZE_IN_BYTES * uFrames); - - while(ptr != endPtr) - { - ADPCM_compress((short *)ptr,(char *)(stream->data() + uFrameOffset),ADPCM_UNPACKED_FRAME_SIZE_IN_SHORTS,m_pEncodeState); - ptr += ADPCM_UNPACKED_FRAME_SIZE_IN_BYTES; - uFrameOffset += ADPCM_PACKED_FRAME_SIZE_IN_BYTES; - } - signal->remove(uTotalDataCompressed); -} - -void KviDccVoiceAdpcmCodec::decode(KviDataBuffer * stream,KviDataBuffer * signal) -{ - if(stream->size() < ADPCM_PACKED_FRAME_SIZE_IN_BYTES)return; // nothing to decode - - char * ptr = (char *)stream->data(); - - // Adpcm codec - int uFrames = stream->size() / ADPCM_PACKED_FRAME_SIZE_IN_BYTES; - int uTotalDataDecompressed = uFrames * ADPCM_PACKED_FRAME_SIZE_IN_BYTES; - int uSignalOffset = signal->size(); - char * endPtr = ptr + (uTotalDataDecompressed); - - signal->addSize(ADPCM_UNPACKED_FRAME_SIZE_IN_BYTES * uFrames); - - while(ptr != endPtr) - { - ADPCM_uncompress((char *)ptr,(short *)(signal->data() + uSignalOffset),ADPCM_UNPACKED_FRAME_SIZE_IN_SHORTS,m_pDecodeState); - ptr += ADPCM_PACKED_FRAME_SIZE_IN_BYTES; - uSignalOffset += ADPCM_UNPACKED_FRAME_SIZE_IN_BYTES; - } - stream->remove(uTotalDataDecompressed); -} - -int KviDccVoiceAdpcmCodec::encodedFrameSize() -{ - return ADPCM_PACKED_FRAME_SIZE_IN_BYTES; -} - -int KviDccVoiceAdpcmCodec::decodedFrameSize() -{ - return ADPCM_UNPACKED_FRAME_SIZE_IN_BYTES; -} |
