LCOV - code coverage report
Current view: top level - libavcodec - mlp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 37 37 100.0 %
Date: 2017-12-14 08:27:08 Functions: 5 5 100.0 %

          Line data    Source code
       1             : /*
       2             :  * MLP codec common code
       3             :  * Copyright (c) 2007-2008 Ian Caulfield
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include <stdint.h>
      23             : 
      24             : #include "libavutil/crc.h"
      25             : #include "libavutil/intreadwrite.h"
      26             : #include "mlp.h"
      27             : 
      28             : const uint8_t ff_mlp_huffman_tables[3][18][2] = {
      29             :     {    /* Huffman table 0, -7 - +10 */
      30             :         {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
      31             :         {0x04, 3}, {0x05, 3}, {0x06, 3}, {0x07, 3},
      32             :         {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
      33             :     }, { /* Huffman table 1, -7 - +8 */
      34             :         {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
      35             :         {0x02, 2}, {0x03, 2},
      36             :         {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
      37             :     }, { /* Huffman table 2, -7 - +7 */
      38             :         {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
      39             :         {0x01, 1},
      40             :         {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
      41             :     }
      42             : };
      43             : 
      44             : const ChannelInformation ff_mlp_ch_info[21] = {
      45             :     { 0x01, 0x01, 0x00, 0x1f }, { 0x03, 0x02, 0x00, 0x1b },
      46             :     { 0x07, 0x02, 0x01, 0x1f }, { 0x0F, 0x02, 0x02, 0x19 },
      47             :     { 0x07, 0x02, 0x01, 0x03 }, { 0x0F, 0x02, 0x02, 0x1f },
      48             :     { 0x1F, 0x02, 0x03, 0x01 }, { 0x07, 0x02, 0x01, 0x1a },
      49             :     { 0x0F, 0x02, 0x02, 0x1f }, { 0x1F, 0x02, 0x03, 0x18 },
      50             :     { 0x0F, 0x02, 0x02, 0x02 }, { 0x1F, 0x02, 0x03, 0x1f },
      51             :     { 0x3F, 0x02, 0x04, 0x00 }, { 0x0F, 0x03, 0x01, 0x1f },
      52             :     { 0x1F, 0x03, 0x02, 0x18 }, { 0x0F, 0x03, 0x01, 0x02 },
      53             :     { 0x1F, 0x03, 0x02, 0x1f }, { 0x3F, 0x03, 0x03, 0x00 },
      54             :     { 0x1F, 0x04, 0x01, 0x01 }, { 0x1F, 0x04, 0x01, 0x18 },
      55             :     { 0x3F, 0x04, 0x02, 0x00 },
      56             : };
      57             : 
      58             : const uint64_t ff_mlp_channel_layouts[12] = {
      59             :     AV_CH_LAYOUT_MONO, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_2_1,
      60             :     AV_CH_LAYOUT_QUAD, AV_CH_LAYOUT_2POINT1, AV_CH_LAYOUT_SURROUND,
      61             :     AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_5POINT0_BACK, AV_CH_LAYOUT_3POINT1,
      62             :     AV_CH_LAYOUT_4POINT1, AV_CH_LAYOUT_5POINT1_BACK, 0,
      63             : };
      64             : 
      65             : static int crc_init = 0;
      66             : #if CONFIG_SMALL
      67             : #define CRC_TABLE_SIZE 257
      68             : #else
      69             : #define CRC_TABLE_SIZE 1024
      70             : #endif
      71             : static AVCRC crc_63[CRC_TABLE_SIZE];
      72             : static AVCRC crc_1D[CRC_TABLE_SIZE];
      73             : static AVCRC crc_2D[CRC_TABLE_SIZE];
      74             : 
      75           9 : av_cold void ff_mlp_init_crc(void)
      76             : {
      77           9 :     if (!crc_init) {
      78           3 :         av_crc_init(crc_63, 0,  8,   0x63, sizeof(crc_63));
      79           3 :         av_crc_init(crc_1D, 0,  8,   0x1D, sizeof(crc_1D));
      80           3 :         av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D));
      81           3 :         crc_init = 1;
      82             :     }
      83           9 : }
      84             : 
      85        3086 : uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size)
      86             : {
      87             :     uint16_t crc;
      88             : 
      89        3086 :     crc = av_crc(crc_2D, 0, buf, buf_size - 2);
      90        3086 :     crc ^= AV_RL16(buf + buf_size - 2);
      91        3086 :     return crc;
      92             : }
      93             : 
      94       19197 : uint8_t ff_mlp_checksum8(const uint8_t *buf, unsigned int buf_size)
      95             : {
      96       19197 :     uint8_t checksum = av_crc(crc_63, 0x3c, buf, buf_size - 1); // crc_63[0xa2] == 0x3c
      97       19197 :     checksum ^= buf[buf_size-1];
      98       19197 :     return checksum;
      99             : }
     100             : 
     101        1757 : uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size)
     102             : {
     103             :     int i;
     104        1757 :     int num_bytes = (bit_size + 2) / 8;
     105             : 
     106        1757 :     int crc = crc_1D[buf[0] & 0x3f];
     107        1757 :     crc = av_crc(crc_1D, crc, buf + 1, num_bytes - 2);
     108        1757 :     crc ^= buf[num_bytes - 1];
     109             : 
     110       14056 :     for (i = 0; i < ((bit_size + 2) & 7); i++) {
     111       12299 :         crc <<= 1;
     112       12299 :         if (crc & 0x100)
     113        6070 :             crc ^= 0x11D;
     114       12299 :         crc ^= (buf[num_bytes] >> (7 - i)) & 1;
     115             :     }
     116             : 
     117        1757 :     return crc;
     118             : }
     119             : 
     120       50771 : uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size)
     121             : {
     122       50771 :     uint32_t scratch = 0;
     123       50771 :     const uint8_t *buf_end = buf + buf_size;
     124             : 
     125       72371 :     for (; ((intptr_t) buf & 3) && buf < buf_end; buf++)
     126       21600 :         scratch ^= *buf;
     127      516113 :     for (; buf < buf_end - 3; buf += 4)
     128      465342 :         scratch ^= *((const uint32_t*)buf);
     129             : 
     130       50771 :     scratch = xor_32_to_8(scratch);
     131             : 
     132       87849 :     for (; buf < buf_end; buf++)
     133       37078 :         scratch ^= *buf;
     134             : 
     135       50771 :     return scratch;
     136             : }

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