GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mlp.c Lines: 38 38 100.0 %
Date: 2020-11-28 20:53:16 Branches: 11 12 91.7 %

Line Branch Exec Source
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/*
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 * MLP codec common code
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 * Copyright (c) 2007-2008 Ian Caulfield
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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#include <stdint.h>
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#include "libavutil/crc.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/thread.h"
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#include "mlp.h"
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const uint8_t ff_mlp_huffman_tables[3][18][2] = {
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    {    /* Huffman table 0, -7 - +10 */
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        {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
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        {0x04, 3}, {0x05, 3}, {0x06, 3}, {0x07, 3},
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        {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
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    }, { /* Huffman table 1, -7 - +8 */
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        {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
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        {0x02, 2}, {0x03, 2},
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        {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
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    }, { /* Huffman table 2, -7 - +7 */
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        {0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
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        {0x01, 1},
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        {0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
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    }
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};
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const ChannelInformation ff_mlp_ch_info[21] = {
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    { 0x01, 0x01, 0x00, 0x1f }, { 0x03, 0x02, 0x00, 0x1b },
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    { 0x07, 0x02, 0x01, 0x1f }, { 0x0F, 0x02, 0x02, 0x19 },
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    { 0x07, 0x02, 0x01, 0x03 }, { 0x0F, 0x02, 0x02, 0x1f },
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    { 0x1F, 0x02, 0x03, 0x01 }, { 0x07, 0x02, 0x01, 0x1a },
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    { 0x0F, 0x02, 0x02, 0x1f }, { 0x1F, 0x02, 0x03, 0x18 },
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    { 0x0F, 0x02, 0x02, 0x02 }, { 0x1F, 0x02, 0x03, 0x1f },
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    { 0x3F, 0x02, 0x04, 0x00 }, { 0x0F, 0x03, 0x01, 0x1f },
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    { 0x1F, 0x03, 0x02, 0x18 }, { 0x0F, 0x03, 0x01, 0x02 },
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    { 0x1F, 0x03, 0x02, 0x1f }, { 0x3F, 0x03, 0x03, 0x00 },
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    { 0x1F, 0x04, 0x01, 0x01 }, { 0x1F, 0x04, 0x01, 0x18 },
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    { 0x3F, 0x04, 0x02, 0x00 },
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};
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const uint64_t ff_mlp_channel_layouts[12] = {
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    AV_CH_LAYOUT_MONO, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_2_1,
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    AV_CH_LAYOUT_QUAD, AV_CH_LAYOUT_2POINT1, AV_CH_LAYOUT_SURROUND,
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    AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_5POINT0_BACK, AV_CH_LAYOUT_3POINT1,
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    AV_CH_LAYOUT_4POINT1, AV_CH_LAYOUT_5POINT1_BACK, 0,
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};
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#if CONFIG_SMALL
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#define CRC_TABLE_SIZE 257
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#else
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#define CRC_TABLE_SIZE 1024
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#endif
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static AVCRC crc_63[CRC_TABLE_SIZE];
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static AVCRC crc_1D[CRC_TABLE_SIZE];
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static AVCRC crc_2D[CRC_TABLE_SIZE];
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static av_cold void mlp_init_crc(void)
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{
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    av_crc_init(crc_63, 0,  8,   0x63, sizeof(crc_63));
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    av_crc_init(crc_1D, 0,  8,   0x1D, sizeof(crc_1D));
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    av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D));
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}
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av_cold void ff_mlp_init_crc(void)
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{
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    static AVOnce init_static_once = AV_ONCE_INIT;
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    ff_thread_once(&init_static_once, mlp_init_crc);
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}
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3089
uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size)
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{
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    uint16_t crc;
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3089
    crc = av_crc(crc_2D, 0, buf, buf_size - 2);
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3089
    crc ^= AV_RL16(buf + buf_size - 2);
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3089
    return crc;
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}
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19197
uint8_t ff_mlp_checksum8(const uint8_t *buf, unsigned int buf_size)
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{
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19197
    uint8_t checksum = av_crc(crc_63, 0x3c, buf, buf_size - 1); // crc_63[0xa2] == 0x3c
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19197
    checksum ^= buf[buf_size-1];
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19197
    return checksum;
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}
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1757
uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size)
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{
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    int i;
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1757
    int num_bytes = (bit_size + 2) / 8;
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1757
    int crc = crc_1D[buf[0] & 0x3f];
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1757
    crc = av_crc(crc_1D, crc, buf + 1, num_bytes - 2);
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    crc ^= buf[num_bytes - 1];
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14056
    for (i = 0; i < ((bit_size + 2) & 7); i++) {
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12299
        crc <<= 1;
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12299
        if (crc & 0x100)
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6070
            crc ^= 0x11D;
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12299
        crc ^= (buf[num_bytes] >> (7 - i)) & 1;
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    }
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    return crc;
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}
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50771
uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size)
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{
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50771
    uint32_t scratch = 0;
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50771
    const uint8_t *buf_end = buf + buf_size;
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    for (; ((intptr_t) buf & 3) && buf < buf_end; buf++)
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21600
        scratch ^= *buf;
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516113
    for (; buf < buf_end - 3; buf += 4)
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465342
        scratch ^= *((const uint32_t*)buf);
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50771
    scratch = xor_32_to_8(scratch);
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87849
    for (; buf < buf_end; buf++)
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37078
        scratch ^= *buf;
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50771
    return scratch;
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}