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| 1 : | edgomez | 467 | /***************************************************************************** |
| 2 : | * | ||
| 3 : | * XVID MPEG-4 VIDEO CODEC | ||
| 4 : | * - cbp function (zero block flags) - | ||
| 5 : | * | ||
| 6 : | edgomez | 742 | * Copyright (C) 2001-2002 - Edouard Gomez <ed.gomez@free.fr> |
| 7 : | edgomez | 467 | * |
| 8 : | edgomez | 655 | * This file is part of XviD, a free MPEG-4 video encoder/decoder |
| 9 : | edgomez | 467 | * |
| 10 : | edgomez | 655 | * XviD is free software; you can redistribute it and/or modify it |
| 11 : | * under the terms of the GNU General Public License as published by | ||
| 12 : | * the Free Software Foundation; either version 2 of the License, or | ||
| 13 : | edgomez | 467 | * (at your option) any later version. |
| 14 : | * | ||
| 15 : | * This program is distributed in the hope that it will be useful, | ||
| 16 : | edgomez | 655 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 : | edgomez | 467 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 : | * GNU General Public License for more details. | ||
| 19 : | * | ||
| 20 : | * You should have received a copy of the GNU General Public License | ||
| 21 : | edgomez | 655 | * along with this program; if not, write to the Free Software |
| 22 : | edgomez | 467 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 : | * | ||
| 24 : | edgomez | 655 | * Under section 8 of the GNU General Public License, the copyright |
| 25 : | * holders of XVID explicitly forbid distribution in the following | ||
| 26 : | * countries: | ||
| 27 : | edgomez | 467 | * |
| 28 : | edgomez | 655 | * - Japan |
| 29 : | * - United States of America | ||
| 30 : | * | ||
| 31 : | * Linking XviD statically or dynamically with other modules is making a | ||
| 32 : | * combined work based on XviD. Thus, the terms and conditions of the | ||
| 33 : | * GNU General Public License cover the whole combination. | ||
| 34 : | * | ||
| 35 : | * As a special exception, the copyright holders of XviD give you | ||
| 36 : | * permission to link XviD with independent modules that communicate with | ||
| 37 : | * XviD solely through the VFW1.1 and DShow interfaces, regardless of the | ||
| 38 : | * license terms of these independent modules, and to copy and distribute | ||
| 39 : | * the resulting combined work under terms of your choice, provided that | ||
| 40 : | * every copy of the combined work is accompanied by a complete copy of | ||
| 41 : | * the source code of XviD (the version of XviD used to produce the | ||
| 42 : | * combined work), being distributed under the terms of the GNU General | ||
| 43 : | * Public License plus this exception. An independent module is a module | ||
| 44 : | * which is not derived from or based on XviD. | ||
| 45 : | * | ||
| 46 : | * Note that people who make modified versions of XviD are not obligated | ||
| 47 : | * to grant this special exception for their modified versions; it is | ||
| 48 : | * their choice whether to do so. The GNU General Public License gives | ||
| 49 : | * permission to release a modified version without this exception; this | ||
| 50 : | * exception also makes it possible to release a modified version which | ||
| 51 : | * carries forward this exception. | ||
| 52 : | * | ||
| 53 : | edgomez | 742 | * $Id: cbp.c,v 1.9 2002-12-28 13:53:08 edgomez Exp $ |
| 54 : | edgomez | 655 | * |
| 55 : | edgomez | 467 | ****************************************************************************/ |
| 56 : | |||
| 57 : | Isibaar | 3 | #include "../portab.h" |
| 58 : | #include "cbp.h" | ||
| 59 : | |||
| 60 : | edgomez | 467 | /***************************************************************************** |
| 61 : | * Global function pointer | ||
| 62 : | ****************************************************************************/ | ||
| 63 : | |||
| 64 : | Isibaar | 3 | cbpFuncPtr calc_cbp; |
| 65 : | |||
| 66 : | edgomez | 467 | /***************************************************************************** |
| 67 : | * Functions | ||
| 68 : | ****************************************************************************/ | ||
| 69 : | |||
| 70 : | edgomez | 46 | /* |
| 71 : | * Returns a field of bits that indicates non zero ac blocks | ||
| 72 : | * for this macro block | ||
| 73 : | */ | ||
| 74 : | edgomez | 195 | uint32_t |
| 75 : | calc_cbp_c(const int16_t codes[6 * 64]) | ||
| 76 : | Isibaar | 3 | { |
| 77 : | edgomez | 46 | uint32_t i, j; |
| 78 : | uint32_t cbp = 0; | ||
| 79 : | Isibaar | 3 | |
| 80 : | edgomez | 195 | for (i = 0; i < 6; i++) { |
| 81 : | for (j = 1; j < 61; j += 4) { | ||
| 82 : | if (codes[i * 64 + j] | codes[i * 64 + j + 1] | | ||
| 83 : | codes[i * 64 + j + 2] | codes[i * 64 + j + 3]) { | ||
| 84 : | Isibaar | 3 | cbp |= 1 << (5 - i); |
| 85 : | break; | ||
| 86 : | } | ||
| 87 : | } | ||
| 88 : | edgomez | 46 | |
| 89 : | edgomez | 195 | if (codes[i * 64 + j] | codes[i * 64 + j + 1] | codes[i * 64 + j + 2]) |
| 90 : | edgomez | 46 | cbp |= 1 << (5 - i); |
| 91 : | |||
| 92 : | } | ||
| 93 : | |||
| 94 : | return cbp; | ||
| 95 : | |||
| 96 : | Isibaar | 3 | } |
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