| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * JPEG-LS common code | ||
| 3 | * Copyright (c) 2003 Michael Niedermayer | ||
| 4 | * Copyright (c) 2006 Konstantin Shishkov | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | /** | ||
| 24 | * @file | ||
| 25 | * JPEG-LS common code. | ||
| 26 | */ | ||
| 27 | |||
| 28 | #ifndef AVCODEC_JPEGLS_H | ||
| 29 | #define AVCODEC_JPEGLS_H | ||
| 30 | |||
| 31 | #include <limits.h> | ||
| 32 | #include "libavutil/common.h" | ||
| 33 | |||
| 34 | #undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */ | ||
| 35 | |||
| 36 | typedef struct JLSState { | ||
| 37 | int T1, T2, T3; | ||
| 38 | int A[367], B[367], C[365], N[367]; | ||
| 39 | int limit, reset, bpp, qbpp, maxval, range; | ||
| 40 | int near, twonear; | ||
| 41 | int run_index[4]; | ||
| 42 | } JLSState; | ||
| 43 | |||
| 44 | /** | ||
| 45 | * Calculate initial JPEG-LS parameters | ||
| 46 | */ | ||
| 47 | void ff_jpegls_init_state(JLSState *state); | ||
| 48 | |||
| 49 | /** | ||
| 50 | * Calculate quantized gradient value, used for context determination | ||
| 51 | */ | ||
| 52 | 269171901 | static inline int ff_jpegls_quantize(JLSState *s, int v) | |
| 53 | { | ||
| 54 |
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269171901 | if (v == 0) |
| 55 | 24954179 | return 0; | |
| 56 |
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244217722 | if (v < 0) { |
| 57 |
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112674204 | if (v <= -s->T3) |
| 58 | 20844916 | return -4; | |
| 59 |
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91829288 | if (v <= -s->T2) |
| 60 | 42820345 | return -3; | |
| 61 |
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49008943 | if (v <= -s->T1) |
| 62 | 25157166 | return -2; | |
| 63 |
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23851777 | if (v < -s->near) |
| 64 | 23851777 | return -1; | |
| 65 | ✗ | return 0; | |
| 66 | } else { | ||
| 67 |
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131543518 | if (v <= s->near) |
| 68 | ✗ | return 0; | |
| 69 |
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131543518 | if (v < s->T1) |
| 70 | 25104206 | return 1; | |
| 71 |
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106439312 | if (v < s->T2) |
| 72 | 34370228 | return 2; | |
| 73 |
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72069084 | if (v < s->T3) |
| 74 | 52885815 | return 3; | |
| 75 | 19183269 | return 4; | |
| 76 | } | ||
| 77 | } | ||
| 78 | |||
| 79 | /** | ||
| 80 | * Calculate JPEG-LS codec values | ||
| 81 | */ | ||
| 82 | void ff_jpegls_reset_coding_parameters(JLSState *s, int reset_all); | ||
| 83 | |||
| 84 | 91019794 | static inline void ff_jpegls_downscale_state(JLSState *state, int Q) | |
| 85 | { | ||
| 86 |
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91019794 | if (state->N[Q] == state->reset) { |
| 87 | 2676670 | state->A[Q] >>= 1; | |
| 88 | 2676670 | state->B[Q] >>= 1; | |
| 89 | 2676670 | state->N[Q] >>= 1; | |
| 90 | } | ||
| 91 | 91019794 | state->N[Q]++; | |
| 92 | 91019794 | } | |
| 93 | |||
| 94 | 89723967 | static inline int ff_jpegls_update_state_regular(JLSState *state, | |
| 95 | int Q, int err) | ||
| 96 | { | ||
| 97 |
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89723967 | if(FFABS(err) > 0xFFFF || FFABS(err) > INT_MAX - state->A[Q]) |
| 98 | ✗ | return -0x10000; | |
| 99 | 89723967 | state->A[Q] += FFABS(err); | |
| 100 | 89723967 | err *= state->twonear; | |
| 101 | 89723967 | state->B[Q] += err; | |
| 102 | |||
| 103 | 89723967 | ff_jpegls_downscale_state(state, Q); | |
| 104 | |||
| 105 |
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89723967 | if (state->B[Q] <= -state->N[Q]) { |
| 106 | 6593340 | state->B[Q] = FFMAX(state->B[Q] + state->N[Q], 1 - state->N[Q]); | |
| 107 |
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6593340 | if (state->C[Q] > -128) |
| 108 | 6580185 | state->C[Q]--; | |
| 109 |
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83130627 | } else if (state->B[Q] > 0) { |
| 110 | 6828272 | state->B[Q] = FFMIN(state->B[Q] - state->N[Q], 0); | |
| 111 |
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6828272 | if (state->C[Q] < 127) |
| 112 | 6828214 | state->C[Q]++; | |
| 113 | } | ||
| 114 | |||
| 115 | 89723967 | return err; | |
| 116 | } | ||
| 117 | |||
| 118 | #define R(a, i) (bits == 8 ? ((uint8_t *)(a))[i] : ((uint16_t *)(a))[i]) | ||
| 119 | #define W(a, i, v) (bits == 8 ? (((uint8_t *)(a))[i] = v) : (((uint16_t *)(a))[i] = v)) | ||
| 120 | |||
| 121 | #endif /* AVCODEC_JPEGLS_H */ | ||
| 122 |