--- trunk/xvidcore/src/quant/quant_h263.c 2002/03/08 02:46:11 3 +++ trunk/xvidcore/src/quant/quant_h263.c 2002/11/17 00:41:20 653 @@ -1,42 +1,54 @@ /************************************************************************** * * XVID MPEG-4 VIDEO CODEC - * quantization/dequantization + * - quantization/dequantization - * - * This program is an implementation of a part of one or more MPEG-4 - * Video tools as specified in ISO/IEC 14496-2 standard. Those intending - * to use this software module in hardware or software products are - * advised that its use may infringe existing patents or copyrights, and - * any such use would be at such party's own risk. The original - * developer of this software module and his/her company, and subsequent - * editors and their companies, will have no liability for use of this - * software or modifications or derivatives thereof. - * - * 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 option) 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * This file is part of XviD, a free MPEG-4 video encoder/decoder * - *************************************************************************/ - -/************************************************************************** + * XviD 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 option) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Under section 8 of the GNU General Public License, the copyright + * holders of XVID explicitly forbid distribution in the following + * countries: + * + * - Japan + * - United States of America + * + * Linking XviD statically or dynamically with other modules is making a + * combined work based on XviD. Thus, the terms and conditions of the + * GNU General Public License cover the whole combination. + * + * As a special exception, the copyright holders of XviD give you + * permission to link XviD with independent modules that communicate with + * XviD solely through the VFW1.1 and DShow interfaces, regardless of the + * license terms of these independent modules, and to copy and distribute + * the resulting combined work under terms of your choice, provided that + * every copy of the combined work is accompanied by a complete copy of + * the source code of XviD (the version of XviD used to produce the + * combined work), being distributed under the terms of the GNU General + * Public License plus this exception. An independent module is a module + * which is not derived from or based on XviD. + * + * Note that people who make modified versions of XviD are not obligated + * to grant this special exception for their modified versions; it is + * their choice whether to do so. The GNU General Public License gives + * permission to release a modified version without this exception; this + * exception also makes it possible to release a modified version which + * carries forward this exception. * - * History: - * - * 26.12.2001 dequant_inter bug fix - * 22.12.2001 clamp dequant output to [-2048,2047] - * 19.11.2001 quant_inter now returns sum of abs. coefficient values - * 02.11.2001 added const to function args - * 28.10.2001 total rewrite + * $Id: quant_h263.c,v 1.4 2002-11-17 00:41:19 edgomez Exp $ * *************************************************************************/ @@ -48,17 +60,16 @@ #define SCALEBITS 16 #define FIX(X) ((1L << SCALEBITS) / (X) + 1) -static const uint32_t multipliers[32] = -{ - 0, FIX(2), FIX(4), FIX(6), - FIX(8), FIX(10), FIX(12), FIX(14), - FIX(16), FIX(18), FIX(20), FIX(22), - FIX(24), FIX(26), FIX(28), FIX(30), - FIX(32), FIX(34), FIX(36), FIX(38), - FIX(40), FIX(42), FIX(44), FIX(46), - FIX(48), FIX(50), FIX(52), FIX(54), - FIX(56), FIX(58), FIX(60), FIX(62) -}; +static const uint32_t multipliers[32] = { + 0, FIX(2), FIX(4), FIX(6), + FIX(8), FIX(10), FIX(12), FIX(14), + FIX(16), FIX(18), FIX(20), FIX(22), + FIX(24), FIX(26), FIX(28), FIX(30), + FIX(32), FIX(34), FIX(36), FIX(38), + FIX(40), FIX(42), FIX(44), FIX(46), + FIX(48), FIX(50), FIX(52), FIX(54), + FIX(56), FIX(58), FIX(60), FIX(62) +}; @@ -77,13 +88,17 @@ */ -void quant_intra_c(int16_t * coeff, const int16_t * data, const uint32_t quant, const uint32_t dcscalar) +void +quant_intra_c(int16_t * coeff, + const int16_t * data, + const uint32_t quant, + const uint32_t dcscalar) { const uint32_t mult = multipliers[quant]; const uint16_t quant_m_2 = quant << 1; - uint32_t i; + uint32_t i; - coeff[0] = DIV_DIV(data[0], (int32_t)dcscalar); + coeff[0] = DIV_DIV(data[0], (int32_t) dcscalar); for (i = 1; i < 64; i++) { int16_t acLevel = data[i]; @@ -111,7 +126,10 @@ /* quantize inter-block */ -uint32_t quant_inter_c(int16_t *coeff, const int16_t *data, const uint32_t quant) +uint32_t +quant_inter_c(int16_t * coeff, + const int16_t * data, + const uint32_t quant) { const uint32_t mult = multipliers[quant]; const uint16_t quant_m_2 = quant << 1; @@ -121,7 +139,7 @@ for (i = 0; i < 64; i++) { int16_t acLevel = data[i]; - + if (acLevel < 0) { acLevel = (-acLevel) - quant_d_2; if (acLevel < quant_m_2) { @@ -151,36 +169,34 @@ /* dequantize intra-block & clamp to [-2048,2047] */ -void dequant_intra_c(int16_t *data, const int16_t *coeff, const uint32_t quant, const uint32_t dcscalar) +void +dequant_intra_c(int16_t * data, + const int16_t * coeff, + const uint32_t quant, + const uint32_t dcscalar) { const int32_t quant_m_2 = quant << 1; const int32_t quant_add = (quant & 1 ? quant : quant - 1); - uint32_t i; + uint32_t i; - data[0] = coeff[0] * dcscalar; - if (data[0] < -2048) - { + data[0] = coeff[0] * dcscalar; + if (data[0] < -2048) { data[0] = -2048; - } - else if (data[0] > 2047) - { + } else if (data[0] > 2047) { data[0] = 2047; } for (i = 1; i < 64; i++) { int32_t acLevel = coeff[i]; - if (acLevel == 0) - { + + if (acLevel == 0) { data[i] = 0; - } - else if (acLevel < 0) - { + } else if (acLevel < 0) { acLevel = quant_m_2 * -acLevel + quant_add; data[i] = (acLevel <= 2048 ? -acLevel : -2048); - } - else // if (acLevel > 0) { - { + } else // if (acLevel > 0) { + { acLevel = quant_m_2 * acLevel + quant_add; data[i] = (acLevel <= 2047 ? acLevel : 2047); } @@ -192,7 +208,10 @@ /* dequantize inter-block & clamp to [-2048,2047] */ -void dequant_inter_c(int16_t *data, const int16_t *coeff, const uint32_t quant) +void +dequant_inter_c(int16_t * data, + const int16_t * coeff, + const uint32_t quant) { const uint16_t quant_m_2 = quant << 1; const uint16_t quant_add = (quant & 1 ? quant : quant - 1); @@ -200,18 +219,14 @@ for (i = 0; i < 64; i++) { int16_t acLevel = coeff[i]; - - if (acLevel == 0) - { + + if (acLevel == 0) { data[i] = 0; - } - else if (acLevel < 0) - { + } else if (acLevel < 0) { acLevel = acLevel * quant_m_2 - quant_add; data[i] = (acLevel >= -2048 ? acLevel : -2048); - } - else // if (acLevel > 0) - { + } else // if (acLevel > 0) + { acLevel = acLevel * quant_m_2 + quant_add; data[i] = (acLevel <= 2047 ? acLevel : 2047); }