| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * huffyuv codec for libavcodec | ||
| 3 | * | ||
| 4 | * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at> | ||
| 5 | * | ||
| 6 | * see https://multimedia.cx/huffyuv.txt for a description of | ||
| 7 | * the algorithm used | ||
| 8 | * | ||
| 9 | * This file is part of FFmpeg. | ||
| 10 | * | ||
| 11 | * FFmpeg is free software; you can redistribute it and/or | ||
| 12 | * modify it under the terms of the GNU Lesser General Public | ||
| 13 | * License as published by the Free Software Foundation; either | ||
| 14 | * version 2.1 of the License, or (at your option) any later version. | ||
| 15 | * | ||
| 16 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 19 | * Lesser General Public License for more details. | ||
| 20 | * | ||
| 21 | * You should have received a copy of the GNU Lesser General Public | ||
| 22 | * License along with FFmpeg; if not, write to the Free Software | ||
| 23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 24 | */ | ||
| 25 | |||
| 26 | /** | ||
| 27 | * @file | ||
| 28 | * huffyuv codec for libavcodec. | ||
| 29 | */ | ||
| 30 | |||
| 31 | #include <stddef.h> | ||
| 32 | #include <stdint.h> | ||
| 33 | |||
| 34 | #include "libavutil/error.h" | ||
| 35 | #include "libavutil/log.h" | ||
| 36 | #include "libavutil/macros.h" | ||
| 37 | |||
| 38 | #include "huffyuv.h" | ||
| 39 | |||
| 40 | 351 | int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table, int n) | |
| 41 | { | ||
| 42 | 351 | int lens[33] = { 0 }; | |
| 43 | uint32_t codes[33]; | ||
| 44 | |||
| 45 |
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836703 | for (int i = 0; i < n; i++) |
| 46 | 836352 | lens[len_table[i]]++; | |
| 47 | |||
| 48 | 351 | codes[32] = 0; | |
| 49 |
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11583 | for (int i = FF_ARRAY_ELEMS(lens) - 1; i > 0; i--) { |
| 50 |
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11232 | if ((lens[i] + codes[i]) & 1) { |
| 51 | ✗ | av_log(NULL, AV_LOG_ERROR, "Error generating huffman table\n"); | |
| 52 | ✗ | return AVERROR_INVALIDDATA; | |
| 53 | } | ||
| 54 | 11232 | codes[i - 1] = (lens[i] + codes[i]) >> 1; | |
| 55 | } | ||
| 56 |
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836703 | for (int i = 0; i < n; i++) { |
| 57 |
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836352 | if (len_table[i]) |
| 58 | 836352 | dst[i] = codes[len_table[i]]++; | |
| 59 | } | ||
| 60 | 351 | return 0; | |
| 61 | } | ||
| 62 |