1cabdff1aSopenharmony_ci/* 2cabdff1aSopenharmony_ci * tables and functions for demuxing SIPR audio muxed RealMedia style 3cabdff1aSopenharmony_ci * 4cabdff1aSopenharmony_ci * This file is part of FFmpeg. 5cabdff1aSopenharmony_ci * 6cabdff1aSopenharmony_ci * FFmpeg is free software; you can redistribute it and/or 7cabdff1aSopenharmony_ci * modify it under the terms of the GNU Lesser General Public 8cabdff1aSopenharmony_ci * License as published by the Free Software Foundation; either 9cabdff1aSopenharmony_ci * version 2.1 of the License, or (at your option) any later version. 10cabdff1aSopenharmony_ci * 11cabdff1aSopenharmony_ci * FFmpeg is distributed in the hope that it will be useful, 12cabdff1aSopenharmony_ci * but WITHOUT ANY WARRANTY; without even the implied warranty of 13cabdff1aSopenharmony_ci * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14cabdff1aSopenharmony_ci * Lesser General Public License for more details. 15cabdff1aSopenharmony_ci * 16cabdff1aSopenharmony_ci * You should have received a copy of the GNU Lesser General Public 17cabdff1aSopenharmony_ci * License along with FFmpeg; if not, write to the Free Software 18cabdff1aSopenharmony_ci * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19cabdff1aSopenharmony_ci */ 20cabdff1aSopenharmony_ci 21cabdff1aSopenharmony_ci#include <stdint.h> 22cabdff1aSopenharmony_ci 23cabdff1aSopenharmony_ci#include "rmsipr.h" 24cabdff1aSopenharmony_ci 25cabdff1aSopenharmony_ciconst unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 }; 26cabdff1aSopenharmony_ci 27cabdff1aSopenharmony_cistatic const unsigned char sipr_swaps[38][2] = { 28cabdff1aSopenharmony_ci { 0, 63 }, { 1, 22 }, { 2, 44 }, { 3, 90 }, 29cabdff1aSopenharmony_ci { 5, 81 }, { 7, 31 }, { 8, 86 }, { 9, 58 }, 30cabdff1aSopenharmony_ci { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 }, 31cabdff1aSopenharmony_ci { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 }, 32cabdff1aSopenharmony_ci { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 }, 33cabdff1aSopenharmony_ci { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 }, 34cabdff1aSopenharmony_ci { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 }, 35cabdff1aSopenharmony_ci { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 }, 36cabdff1aSopenharmony_ci { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 }, 37cabdff1aSopenharmony_ci { 67, 83 }, { 77, 80 } 38cabdff1aSopenharmony_ci}; 39cabdff1aSopenharmony_ci 40cabdff1aSopenharmony_ci/* This can be optimized, e.g. use memcpy() if data blocks are aligned. */ 41cabdff1aSopenharmony_civoid ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize) 42cabdff1aSopenharmony_ci{ 43cabdff1aSopenharmony_ci int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket 44cabdff1aSopenharmony_ci 45cabdff1aSopenharmony_ci for (n = 0; n < 38; n++) { 46cabdff1aSopenharmony_ci int j; 47cabdff1aSopenharmony_ci int i = bs * sipr_swaps[n][0]; 48cabdff1aSopenharmony_ci int o = bs * sipr_swaps[n][1]; 49cabdff1aSopenharmony_ci 50cabdff1aSopenharmony_ci /* swap 4bit-nibbles of block 'i' with 'o' */ 51cabdff1aSopenharmony_ci for (j = 0; j < bs; j++, i++, o++) { 52cabdff1aSopenharmony_ci int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF, 53cabdff1aSopenharmony_ci y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF; 54cabdff1aSopenharmony_ci 55cabdff1aSopenharmony_ci buf[o >> 1] = (x << (4 * (o & 1))) | 56cabdff1aSopenharmony_ci (buf[o >> 1] & (0xF << (4 * !(o & 1)))); 57cabdff1aSopenharmony_ci buf[i >> 1] = (y << (4 * (i & 1))) | 58cabdff1aSopenharmony_ci (buf[i >> 1] & (0xF << (4 * !(i & 1)))); 59cabdff1aSopenharmony_ci } 60cabdff1aSopenharmony_ci } 61cabdff1aSopenharmony_ci} 62