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823 lines
24 KiB
823 lines
24 KiB
/* |
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* SVQ1 decoder |
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* ported to MPlayer by Arpi <arpi@thot.banki.hu> |
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* ported to libavcodec by Nick Kurshev <nickols_k@mail.ru> |
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* |
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* Copyright (C) 2002 the xine project |
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* Copyright (C) 2002 the ffmpeg project |
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* |
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* SVQ1 Encoder (c) 2004 Mike Melanson <melanson@pcisys.net> |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/** |
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* @file |
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* Sorenson Vector Quantizer #1 (SVQ1) video codec. |
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* For more information of the SVQ1 algorithm, visit: |
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* http://www.pcisys.net/~melanson/codecs/ |
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*/ |
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "mpegvideo.h" |
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#include "mathops.h" |
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|
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#include "svq1.h" |
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|
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#undef NDEBUG |
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#include <assert.h> |
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extern const uint8_t mvtab[33][2]; |
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|
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static VLC svq1_block_type; |
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static VLC svq1_motion_component; |
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static VLC svq1_intra_multistage[6]; |
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static VLC svq1_inter_multistage[6]; |
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static VLC svq1_intra_mean; |
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static VLC svq1_inter_mean; |
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|
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/* motion vector (prediction) */ |
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typedef struct svq1_pmv_s { |
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int x; |
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int y; |
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} svq1_pmv; |
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|
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static const uint16_t checksum_table[256] = { |
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0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7, |
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0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF, |
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0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6, |
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0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE, |
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0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485, |
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0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D, |
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0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4, |
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0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC, |
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0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823, |
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0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B, |
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0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12, |
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0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A, |
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0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41, |
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0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49, |
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0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70, |
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0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78, |
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0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F, |
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0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067, |
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0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E, |
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0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256, |
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0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D, |
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0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, |
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0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C, |
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0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634, |
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0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB, |
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0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3, |
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0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A, |
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0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92, |
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0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9, |
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0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1, |
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0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8, |
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0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0 |
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}; |
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static const uint8_t string_table[256] = { |
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0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54, |
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0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D, |
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0x52, 0x87, 0x2D, 0xF8, 0xAC, 0x79, 0xD3, 0x06, |
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0x7B, 0xAE, 0x04, 0xD1, 0x85, 0x50, 0xFA, 0x2F, |
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0xA4, 0x71, 0xDB, 0x0E, 0x5A, 0x8F, 0x25, 0xF0, |
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0x8D, 0x58, 0xF2, 0x27, 0x73, 0xA6, 0x0C, 0xD9, |
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0xF6, 0x23, 0x89, 0x5C, 0x08, 0xDD, 0x77, 0xA2, |
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0xDF, 0x0A, 0xA0, 0x75, 0x21, 0xF4, 0x5E, 0x8B, |
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0x9D, 0x48, 0xE2, 0x37, 0x63, 0xB6, 0x1C, 0xC9, |
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0xB4, 0x61, 0xCB, 0x1E, 0x4A, 0x9F, 0x35, 0xE0, |
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0xCF, 0x1A, 0xB0, 0x65, 0x31, 0xE4, 0x4E, 0x9B, |
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0xE6, 0x33, 0x99, 0x4C, 0x18, 0xCD, 0x67, 0xB2, |
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0x39, 0xEC, 0x46, 0x93, 0xC7, 0x12, 0xB8, 0x6D, |
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0x10, 0xC5, 0x6F, 0xBA, 0xEE, 0x3B, 0x91, 0x44, |
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0x6B, 0xBE, 0x14, 0xC1, 0x95, 0x40, 0xEA, 0x3F, |
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0x42, 0x97, 0x3D, 0xE8, 0xBC, 0x69, 0xC3, 0x16, |
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0xEF, 0x3A, 0x90, 0x45, 0x11, 0xC4, 0x6E, 0xBB, |
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0xC6, 0x13, 0xB9, 0x6C, 0x38, 0xED, 0x47, 0x92, |
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0xBD, 0x68, 0xC2, 0x17, 0x43, 0x96, 0x3C, 0xE9, |
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0x94, 0x41, 0xEB, 0x3E, 0x6A, 0xBF, 0x15, 0xC0, |
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0x4B, 0x9E, 0x34, 0xE1, 0xB5, 0x60, 0xCA, 0x1F, |
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0x62, 0xB7, 0x1D, 0xC8, 0x9C, 0x49, 0xE3, 0x36, |
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0x19, 0xCC, 0x66, 0xB3, 0xE7, 0x32, 0x98, 0x4D, |
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0x30, 0xE5, 0x4F, 0x9A, 0xCE, 0x1B, 0xB1, 0x64, |
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0x72, 0xA7, 0x0D, 0xD8, 0x8C, 0x59, 0xF3, 0x26, |
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0x5B, 0x8E, 0x24, 0xF1, 0xA5, 0x70, 0xDA, 0x0F, |
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0x20, 0xF5, 0x5F, 0x8A, 0xDE, 0x0B, 0xA1, 0x74, |
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0x09, 0xDC, 0x76, 0xA3, 0xF7, 0x22, 0x88, 0x5D, |
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0xD6, 0x03, 0xA9, 0x7C, 0x28, 0xFD, 0x57, 0x82, |
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0xFF, 0x2A, 0x80, 0x55, 0x01, 0xD4, 0x7E, 0xAB, |
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0x84, 0x51, 0xFB, 0x2E, 0x7A, 0xAF, 0x05, 0xD0, |
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0xAD, 0x78, 0xD2, 0x07, 0x53, 0x86, 0x2C, 0xF9 |
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}; |
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|
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#define SVQ1_PROCESS_VECTOR()\ |
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for (; level > 0; i++) {\ |
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/* process next depth */\ |
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if (i == m) {\ |
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m = n;\ |
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if (--level == 0)\ |
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break;\ |
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}\ |
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/* divide block if next bit set */\ |
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if (get_bits1 (bitbuf) == 0)\ |
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break;\ |
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/* add child nodes */\ |
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list[n++] = list[i];\ |
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list[n++] = list[i] + (((level & 1) ? pitch : 1) << ((level / 2) + 1));\ |
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} |
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|
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#define SVQ1_ADD_CODEBOOK()\ |
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/* add codebook entries to vector */\ |
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for (j=0; j < stages; j++) {\ |
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n3 = codebook[entries[j]] ^ 0x80808080;\ |
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n1 += ((n3 & 0xFF00FF00) >> 8);\ |
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n2 += (n3 & 0x00FF00FF);\ |
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}\ |
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\ |
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/* clip to [0..255] */\ |
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if (n1 & 0xFF00FF00) {\ |
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n3 = ((( n1 >> 15) & 0x00010001) | 0x01000100) - 0x00010001;\ |
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n1 += 0x7F007F00;\ |
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n1 |= (((~n1 >> 15) & 0x00010001) | 0x01000100) - 0x00010001;\ |
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n1 &= (n3 & 0x00FF00FF);\ |
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}\ |
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\ |
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if (n2 & 0xFF00FF00) {\ |
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n3 = ((( n2 >> 15) & 0x00010001) | 0x01000100) - 0x00010001;\ |
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n2 += 0x7F007F00;\ |
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n2 |= (((~n2 >> 15) & 0x00010001) | 0x01000100) - 0x00010001;\ |
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n2 &= (n3 & 0x00FF00FF);\ |
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} |
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#define SVQ1_DO_CODEBOOK_INTRA()\ |
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for (y=0; y < height; y++) {\ |
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for (x=0; x < (width / 4); x++, codebook++) {\ |
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n1 = n4;\ |
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n2 = n4;\ |
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SVQ1_ADD_CODEBOOK()\ |
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/* store result */\ |
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dst[x] = (n1 << 8) | n2;\ |
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}\ |
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dst += (pitch / 4);\ |
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} |
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#define SVQ1_DO_CODEBOOK_NONINTRA()\ |
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for (y=0; y < height; y++) {\ |
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for (x=0; x < (width / 4); x++, codebook++) {\ |
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n3 = dst[x];\ |
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/* add mean value to vector */\ |
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n1 = ((n3 & 0xFF00FF00) >> 8) + n4;\ |
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n2 = (n3 & 0x00FF00FF) + n4;\ |
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SVQ1_ADD_CODEBOOK()\ |
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/* store result */\ |
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dst[x] = (n1 << 8) | n2;\ |
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}\ |
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dst += (pitch / 4);\ |
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} |
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#define SVQ1_CALC_CODEBOOK_ENTRIES(cbook)\ |
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codebook = (const uint32_t *) cbook[level];\ |
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bit_cache = get_bits (bitbuf, 4*stages);\ |
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/* calculate codebook entries for this vector */\ |
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for (j=0; j < stages; j++) {\ |
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entries[j] = (((bit_cache >> (4*(stages - j - 1))) & 0xF) + 16*j) << (level + 1);\ |
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}\ |
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mean -= (stages * 128);\ |
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n4 = ((mean + (mean >> 31)) << 16) | (mean & 0xFFFF); |
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static int svq1_decode_block_intra (GetBitContext *bitbuf, uint8_t *pixels, int pitch ) { |
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uint32_t bit_cache; |
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uint8_t *list[63]; |
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uint32_t *dst; |
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const uint32_t *codebook; |
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int entries[6]; |
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int i, j, m, n; |
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int mean, stages; |
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unsigned x, y, width, height, level; |
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uint32_t n1, n2, n3, n4; |
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|
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/* initialize list for breadth first processing of vectors */ |
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list[0] = pixels; |
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|
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/* recursively process vector */ |
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for (i=0, m=1, n=1, level=5; i < n; i++) { |
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SVQ1_PROCESS_VECTOR(); |
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|
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/* destination address and vector size */ |
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dst = (uint32_t *) list[i]; |
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width = 1 << ((4 + level) /2); |
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height = 1 << ((3 + level) /2); |
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|
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/* get number of stages (-1 skips vector, 0 for mean only) */ |
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stages = get_vlc2(bitbuf, svq1_intra_multistage[level].table, 3, 3) - 1; |
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|
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if (stages == -1) { |
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for (y=0; y < height; y++) { |
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memset (&dst[y*(pitch / 4)], 0, width); |
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} |
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continue; /* skip vector */ |
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} |
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|
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if ((stages > 0) && (level >= 4)) { |
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av_dlog(NULL, |
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"Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n", |
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stages, level); |
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return -1; /* invalid vector */ |
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} |
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mean = get_vlc2(bitbuf, svq1_intra_mean.table, 8, 3); |
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|
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if (stages == 0) { |
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for (y=0; y < height; y++) { |
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memset (&dst[y*(pitch / 4)], mean, width); |
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} |
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} else { |
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SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_intra_codebooks); |
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SVQ1_DO_CODEBOOK_INTRA() |
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} |
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} |
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return 0; |
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} |
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static int svq1_decode_block_non_intra (GetBitContext *bitbuf, uint8_t *pixels, int pitch ) { |
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uint32_t bit_cache; |
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uint8_t *list[63]; |
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uint32_t *dst; |
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const uint32_t *codebook; |
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int entries[6]; |
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int i, j, m, n; |
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int mean, stages; |
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int x, y, width, height, level; |
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uint32_t n1, n2, n3, n4; |
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|
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/* initialize list for breadth first processing of vectors */ |
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list[0] = pixels; |
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|
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/* recursively process vector */ |
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for (i=0, m=1, n=1, level=5; i < n; i++) { |
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SVQ1_PROCESS_VECTOR(); |
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|
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/* destination address and vector size */ |
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dst = (uint32_t *) list[i]; |
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width = 1 << ((4 + level) /2); |
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height = 1 << ((3 + level) /2); |
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|
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/* get number of stages (-1 skips vector, 0 for mean only) */ |
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stages = get_vlc2(bitbuf, svq1_inter_multistage[level].table, 3, 2) - 1; |
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|
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if (stages == -1) continue; /* skip vector */ |
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|
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if ((stages > 0) && (level >= 4)) { |
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av_dlog(NULL, |
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"Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n", |
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stages, level); |
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return -1; /* invalid vector */ |
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} |
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|
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mean = get_vlc2(bitbuf, svq1_inter_mean.table, 9, 3) - 256; |
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|
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SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_inter_codebooks); |
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SVQ1_DO_CODEBOOK_NONINTRA() |
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} |
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return 0; |
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} |
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static int svq1_decode_motion_vector (GetBitContext *bitbuf, svq1_pmv *mv, svq1_pmv **pmv) { |
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int diff; |
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int i; |
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|
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for (i=0; i < 2; i++) { |
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|
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/* get motion code */ |
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diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2); |
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if(diff<0) |
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return -1; |
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else if(diff){ |
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if(get_bits1(bitbuf)) diff= -diff; |
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} |
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|
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/* add median of motion vector predictors and clip result */ |
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if (i == 1) |
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mv->y = ((diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y)) << 26) >> 26; |
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else |
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mv->x = ((diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x)) << 26) >> 26; |
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} |
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|
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return 0; |
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} |
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|
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static void svq1_skip_block (uint8_t *current, uint8_t *previous, int pitch, int x, int y) { |
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uint8_t *src; |
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uint8_t *dst; |
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int i; |
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|
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src = &previous[x + y*pitch]; |
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dst = current; |
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|
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for (i=0; i < 16; i++) { |
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memcpy (dst, src, 16); |
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src += pitch; |
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dst += pitch; |
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} |
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} |
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|
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static int svq1_motion_inter_block (MpegEncContext *s, GetBitContext *bitbuf, |
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uint8_t *current, uint8_t *previous, int pitch, |
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svq1_pmv *motion, int x, int y) { |
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uint8_t *src; |
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uint8_t *dst; |
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svq1_pmv mv; |
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svq1_pmv *pmv[3]; |
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int result; |
|
|
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/* predict and decode motion vector */ |
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pmv[0] = &motion[0]; |
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if (y == 0) { |
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pmv[1] = |
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pmv[2] = pmv[0]; |
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} |
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else { |
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pmv[1] = &motion[(x / 8) + 2]; |
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pmv[2] = &motion[(x / 8) + 4]; |
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} |
|
|
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result = svq1_decode_motion_vector (bitbuf, &mv, pmv); |
|
|
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if (result != 0) |
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return result; |
|
|
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motion[0].x = |
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motion[(x / 8) + 2].x = |
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motion[(x / 8) + 3].x = mv.x; |
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motion[0].y = |
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motion[(x / 8) + 2].y = |
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motion[(x / 8) + 3].y = mv.y; |
|
|
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if(y + (mv.y >> 1)<0) |
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mv.y= 0; |
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if(x + (mv.x >> 1)<0) |
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mv.x= 0; |
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|
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src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1))*pitch]; |
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dst = current; |
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|
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s->dsp.put_pixels_tab[0][((mv.y & 1) << 1) | (mv.x & 1)](dst,src,pitch,16); |
|
|
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return 0; |
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} |
|
|
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static int svq1_motion_inter_4v_block (MpegEncContext *s, GetBitContext *bitbuf, |
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uint8_t *current, uint8_t *previous, int pitch, |
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svq1_pmv *motion,int x, int y) { |
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uint8_t *src; |
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uint8_t *dst; |
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svq1_pmv mv; |
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svq1_pmv *pmv[4]; |
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int i, result; |
|
|
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/* predict and decode motion vector (0) */ |
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pmv[0] = &motion[0]; |
|
if (y == 0) { |
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pmv[1] = |
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pmv[2] = pmv[0]; |
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} |
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else { |
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pmv[1] = &motion[(x / 8) + 2]; |
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pmv[2] = &motion[(x / 8) + 4]; |
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} |
|
|
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result = svq1_decode_motion_vector (bitbuf, &mv, pmv); |
|
|
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if (result != 0) |
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return result; |
|
|
|
/* predict and decode motion vector (1) */ |
|
pmv[0] = &mv; |
|
if (y == 0) { |
|
pmv[1] = |
|
pmv[2] = pmv[0]; |
|
} |
|
else { |
|
pmv[1] = &motion[(x / 8) + 3]; |
|
} |
|
result = svq1_decode_motion_vector (bitbuf, &motion[0], pmv); |
|
|
|
if (result != 0) |
|
return result; |
|
|
|
/* predict and decode motion vector (2) */ |
|
pmv[1] = &motion[0]; |
|
pmv[2] = &motion[(x / 8) + 1]; |
|
|
|
result = svq1_decode_motion_vector (bitbuf, &motion[(x / 8) + 2], pmv); |
|
|
|
if (result != 0) |
|
return result; |
|
|
|
/* predict and decode motion vector (3) */ |
|
pmv[2] = &motion[(x / 8) + 2]; |
|
pmv[3] = &motion[(x / 8) + 3]; |
|
|
|
result = svq1_decode_motion_vector (bitbuf, pmv[3], pmv); |
|
|
|
if (result != 0) |
|
return result; |
|
|
|
/* form predictions */ |
|
for (i=0; i < 4; i++) { |
|
int mvx= pmv[i]->x + (i&1)*16; |
|
int mvy= pmv[i]->y + (i>>1)*16; |
|
|
|
///XXX /FIXME clipping or padding? |
|
if(y + (mvy >> 1)<0) |
|
mvy= 0; |
|
if(x + (mvx >> 1)<0) |
|
mvx= 0; |
|
|
|
src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1))*pitch]; |
|
dst = current; |
|
|
|
s->dsp.put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst,src,pitch,8); |
|
|
|
/* select next block */ |
|
if (i & 1) { |
|
current += 8*(pitch - 1); |
|
} else { |
|
current += 8; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int svq1_decode_delta_block (MpegEncContext *s, GetBitContext *bitbuf, |
|
uint8_t *current, uint8_t *previous, int pitch, |
|
svq1_pmv *motion, int x, int y) { |
|
uint32_t block_type; |
|
int result = 0; |
|
|
|
/* get block type */ |
|
block_type = get_vlc2(bitbuf, svq1_block_type.table, 2, 2); |
|
|
|
/* reset motion vectors */ |
|
if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) { |
|
motion[0].x = |
|
motion[0].y = |
|
motion[(x / 8) + 2].x = |
|
motion[(x / 8) + 2].y = |
|
motion[(x / 8) + 3].x = |
|
motion[(x / 8) + 3].y = 0; |
|
} |
|
|
|
switch (block_type) { |
|
case SVQ1_BLOCK_SKIP: |
|
svq1_skip_block (current, previous, pitch, x, y); |
|
break; |
|
|
|
case SVQ1_BLOCK_INTER: |
|
result = svq1_motion_inter_block (s, bitbuf, current, previous, pitch, motion, x, y); |
|
|
|
if (result != 0) |
|
{ |
|
av_dlog(s->avctx, "Error in svq1_motion_inter_block %i\n", result); |
|
break; |
|
} |
|
result = svq1_decode_block_non_intra (bitbuf, current, pitch); |
|
break; |
|
|
|
case SVQ1_BLOCK_INTER_4V: |
|
result = svq1_motion_inter_4v_block (s, bitbuf, current, previous, pitch, motion, x, y); |
|
|
|
if (result != 0) |
|
{ |
|
av_dlog(s->avctx, "Error in svq1_motion_inter_4v_block %i\n", result); |
|
break; |
|
} |
|
result = svq1_decode_block_non_intra (bitbuf, current, pitch); |
|
break; |
|
|
|
case SVQ1_BLOCK_INTRA: |
|
result = svq1_decode_block_intra (bitbuf, current, pitch); |
|
break; |
|
} |
|
|
|
return result; |
|
} |
|
|
|
uint16_t ff_svq1_packet_checksum (const uint8_t *data, const int length, int value) { |
|
int i; |
|
|
|
for (i=0; i < length; i++) { |
|
value = checksum_table[data[i] ^ (value >> 8)] ^ ((value & 0xFF) << 8); |
|
} |
|
|
|
return value; |
|
} |
|
|
|
static void svq1_parse_string (GetBitContext *bitbuf, uint8_t *out) { |
|
uint8_t seed; |
|
int i; |
|
|
|
out[0] = get_bits (bitbuf, 8); |
|
|
|
seed = string_table[out[0]]; |
|
|
|
for (i=1; i <= out[0]; i++) { |
|
out[i] = get_bits (bitbuf, 8) ^ seed; |
|
seed = string_table[out[i] ^ seed]; |
|
} |
|
} |
|
|
|
static int svq1_decode_frame_header (GetBitContext *bitbuf,MpegEncContext *s) { |
|
int frame_size_code; |
|
|
|
skip_bits(bitbuf, 8); /* temporal_reference */ |
|
|
|
/* frame type */ |
|
s->pict_type= get_bits (bitbuf, 2)+1; |
|
if(s->pict_type==4) |
|
return -1; |
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_I) { |
|
|
|
/* unknown fields */ |
|
if (s->f_code == 0x50 || s->f_code == 0x60) { |
|
int csum = get_bits (bitbuf, 16); |
|
|
|
csum = ff_svq1_packet_checksum (bitbuf->buffer, bitbuf->size_in_bits>>3, csum); |
|
|
|
// av_log(s->avctx, AV_LOG_INFO, "%s checksum (%02x) for packet data\n", |
|
// (csum == 0) ? "correct" : "incorrect", csum); |
|
} |
|
|
|
if ((s->f_code ^ 0x10) >= 0x50) { |
|
uint8_t msg[256]; |
|
|
|
svq1_parse_string (bitbuf, msg); |
|
|
|
av_log(s->avctx, AV_LOG_INFO, "embedded message: \"%s\"\n", (char *) msg); |
|
} |
|
|
|
skip_bits (bitbuf, 2); |
|
skip_bits (bitbuf, 2); |
|
skip_bits1 (bitbuf); |
|
|
|
/* load frame size */ |
|
frame_size_code = get_bits (bitbuf, 3); |
|
|
|
if (frame_size_code == 7) { |
|
/* load width, height (12 bits each) */ |
|
s->width = get_bits (bitbuf, 12); |
|
s->height = get_bits (bitbuf, 12); |
|
|
|
if (!s->width || !s->height) |
|
return -1; |
|
} else { |
|
/* get width, height from table */ |
|
s->width = ff_svq1_frame_size_table[frame_size_code].width; |
|
s->height = ff_svq1_frame_size_table[frame_size_code].height; |
|
} |
|
} |
|
|
|
/* unknown fields */ |
|
if (get_bits1 (bitbuf) == 1) { |
|
skip_bits1 (bitbuf); /* use packet checksum if (1) */ |
|
skip_bits1 (bitbuf); /* component checksums after image data if (1) */ |
|
|
|
if (get_bits (bitbuf, 2) != 0) |
|
return -1; |
|
} |
|
|
|
if (get_bits1 (bitbuf) == 1) { |
|
skip_bits1 (bitbuf); |
|
skip_bits (bitbuf, 4); |
|
skip_bits1 (bitbuf); |
|
skip_bits (bitbuf, 2); |
|
|
|
while (get_bits1 (bitbuf) == 1) { |
|
skip_bits (bitbuf, 8); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int svq1_decode_frame(AVCodecContext *avctx, |
|
void *data, int *data_size, |
|
AVPacket *avpkt) |
|
{ |
|
const uint8_t *buf = avpkt->data; |
|
int buf_size = avpkt->size; |
|
MpegEncContext *s=avctx->priv_data; |
|
uint8_t *current, *previous; |
|
int result, i, x, y, width, height; |
|
AVFrame *pict = data; |
|
svq1_pmv *pmv; |
|
|
|
/* initialize bit buffer */ |
|
init_get_bits(&s->gb,buf,buf_size*8); |
|
|
|
/* decode frame header */ |
|
s->f_code = get_bits (&s->gb, 22); |
|
|
|
if ((s->f_code & ~0x70) || !(s->f_code & 0x60)) |
|
return -1; |
|
|
|
/* swap some header bytes (why?) */ |
|
if (s->f_code != 0x20) { |
|
uint32_t *src = (uint32_t *) (buf + 4); |
|
|
|
for (i=0; i < 4; i++) { |
|
src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i]; |
|
} |
|
} |
|
|
|
result = svq1_decode_frame_header (&s->gb, s); |
|
|
|
if (result != 0) |
|
{ |
|
av_dlog(s->avctx, "Error in svq1_decode_frame_header %i\n",result); |
|
return result; |
|
} |
|
|
|
//FIXME this avoids some confusion for "B frames" without 2 references |
|
//this should be removed after libavcodec can handle more flexible picture types & ordering |
|
if(s->pict_type==AV_PICTURE_TYPE_B && s->last_picture_ptr==NULL) return buf_size; |
|
|
|
if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B) |
|
||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I) |
|
|| avctx->skip_frame >= AVDISCARD_ALL) |
|
return buf_size; |
|
|
|
if(MPV_frame_start(s, avctx) < 0) |
|
return -1; |
|
|
|
pmv = av_malloc((FFALIGN(s->width, 16)/8 + 3) * sizeof(*pmv)); |
|
if (!pmv) |
|
return -1; |
|
|
|
/* decode y, u and v components */ |
|
for (i=0; i < 3; i++) { |
|
int linesize; |
|
if (i == 0) { |
|
width = FFALIGN(s->width, 16); |
|
height = FFALIGN(s->height, 16); |
|
linesize= s->linesize; |
|
} else { |
|
if(s->flags&CODEC_FLAG_GRAY) break; |
|
width = FFALIGN(s->width/4, 16); |
|
height = FFALIGN(s->height/4, 16); |
|
linesize= s->uvlinesize; |
|
} |
|
|
|
current = s->current_picture.data[i]; |
|
|
|
if(s->pict_type==AV_PICTURE_TYPE_B){ |
|
previous = s->next_picture.data[i]; |
|
}else{ |
|
previous = s->last_picture.data[i]; |
|
} |
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_I) { |
|
/* keyframe */ |
|
for (y=0; y < height; y+=16) { |
|
for (x=0; x < width; x+=16) { |
|
result = svq1_decode_block_intra (&s->gb, ¤t[x], linesize); |
|
if (result != 0) |
|
{ |
|
av_log(s->avctx, AV_LOG_INFO, "Error in svq1_decode_block %i (keyframe)\n",result); |
|
goto err; |
|
} |
|
} |
|
current += 16*linesize; |
|
} |
|
} else { |
|
/* delta frame */ |
|
memset (pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv)); |
|
|
|
for (y=0; y < height; y+=16) { |
|
for (x=0; x < width; x+=16) { |
|
result = svq1_decode_delta_block (s, &s->gb, ¤t[x], previous, |
|
linesize, pmv, x, y); |
|
if (result != 0) |
|
{ |
|
av_dlog(s->avctx, "Error in svq1_decode_delta_block %i\n",result); |
|
goto err; |
|
} |
|
} |
|
|
|
pmv[0].x = |
|
pmv[0].y = 0; |
|
|
|
current += 16*linesize; |
|
} |
|
} |
|
} |
|
|
|
*pict = *(AVFrame*)&s->current_picture; |
|
|
|
|
|
MPV_frame_end(s); |
|
|
|
*data_size=sizeof(AVFrame); |
|
result = buf_size; |
|
err: |
|
av_free(pmv); |
|
return result; |
|
} |
|
|
|
static av_cold int svq1_decode_init(AVCodecContext *avctx) |
|
{ |
|
MpegEncContext *s = avctx->priv_data; |
|
int i; |
|
int offset = 0; |
|
|
|
MPV_decode_defaults(s); |
|
|
|
s->avctx = avctx; |
|
s->width = (avctx->width+3)&~3; |
|
s->height = (avctx->height+3)&~3; |
|
s->codec_id= avctx->codec->id; |
|
avctx->pix_fmt = PIX_FMT_YUV410P; |
|
avctx->has_b_frames= 1; // not true, but DP frames and these behave like unidirectional b frames |
|
s->flags= avctx->flags; |
|
if (MPV_common_init(s) < 0) return -1; |
|
|
|
INIT_VLC_STATIC(&svq1_block_type, 2, 4, |
|
&ff_svq1_block_type_vlc[0][1], 2, 1, |
|
&ff_svq1_block_type_vlc[0][0], 2, 1, 6); |
|
|
|
INIT_VLC_STATIC(&svq1_motion_component, 7, 33, |
|
&mvtab[0][1], 2, 1, |
|
&mvtab[0][0], 2, 1, 176); |
|
|
|
for (i = 0; i < 6; i++) { |
|
static const uint8_t sizes[2][6] = {{14, 10, 14, 18, 16, 18}, {10, 10, 14, 14, 14, 16}}; |
|
static VLC_TYPE table[168][2]; |
|
svq1_intra_multistage[i].table = &table[offset]; |
|
svq1_intra_multistage[i].table_allocated = sizes[0][i]; |
|
offset += sizes[0][i]; |
|
init_vlc(&svq1_intra_multistage[i], 3, 8, |
|
&ff_svq1_intra_multistage_vlc[i][0][1], 2, 1, |
|
&ff_svq1_intra_multistage_vlc[i][0][0], 2, 1, INIT_VLC_USE_NEW_STATIC); |
|
svq1_inter_multistage[i].table = &table[offset]; |
|
svq1_inter_multistage[i].table_allocated = sizes[1][i]; |
|
offset += sizes[1][i]; |
|
init_vlc(&svq1_inter_multistage[i], 3, 8, |
|
&ff_svq1_inter_multistage_vlc[i][0][1], 2, 1, |
|
&ff_svq1_inter_multistage_vlc[i][0][0], 2, 1, INIT_VLC_USE_NEW_STATIC); |
|
} |
|
|
|
INIT_VLC_STATIC(&svq1_intra_mean, 8, 256, |
|
&ff_svq1_intra_mean_vlc[0][1], 4, 2, |
|
&ff_svq1_intra_mean_vlc[0][0], 4, 2, 632); |
|
|
|
INIT_VLC_STATIC(&svq1_inter_mean, 9, 512, |
|
&ff_svq1_inter_mean_vlc[0][1], 4, 2, |
|
&ff_svq1_inter_mean_vlc[0][0], 4, 2, 1434); |
|
|
|
return 0; |
|
} |
|
|
|
static av_cold int svq1_decode_end(AVCodecContext *avctx) |
|
{ |
|
MpegEncContext *s = avctx->priv_data; |
|
|
|
MPV_common_end(s); |
|
return 0; |
|
} |
|
|
|
|
|
AVCodec ff_svq1_decoder = { |
|
"svq1", |
|
AVMEDIA_TYPE_VIDEO, |
|
CODEC_ID_SVQ1, |
|
sizeof(MpegEncContext), |
|
svq1_decode_init, |
|
NULL, |
|
svq1_decode_end, |
|
svq1_decode_frame, |
|
CODEC_CAP_DR1, |
|
.flush= ff_mpeg_flush, |
|
.pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV410P, PIX_FMT_NONE}, |
|
.long_name= NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"), |
|
};
|
|
|