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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2002 Michael Niedermayer |
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3 | * Copyright (c) 2012 Jeremy Tran |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or modify |
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8 | * it under the terms of the GNU General Public License as published by |
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9 | * the Free Software Foundation; either version 2 of the License, or |
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10 | * (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License along |
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18 | * with FFmpeg; if not, write to the Free Software Foundation, Inc., |
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19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 | */ |
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21 | |||
22 | /** |
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23 | * @file |
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24 | * Apply a smartblur filter to the input video |
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25 | * Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer. |
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26 | */ |
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27 | |||
28 | #include "libavutil/opt.h" |
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29 | #include "libavutil/pixdesc.h" |
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30 | #include "libswscale/swscale.h" |
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31 | |||
32 | #include "avfilter.h" |
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33 | #include "formats.h" |
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34 | #include "internal.h" |
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35 | |||
36 | #define RADIUS_MIN 0.1 |
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37 | #define RADIUS_MAX 5.0 |
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38 | |||
39 | #define STRENGTH_MIN -1.0 |
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40 | #define STRENGTH_MAX 1.0 |
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41 | |||
42 | #define THRESHOLD_MIN -30 |
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43 | #define THRESHOLD_MAX 30 |
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44 | |||
45 | typedef struct { |
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46 | float radius; |
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47 | float strength; |
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48 | int threshold; |
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49 | float quality; |
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50 | struct SwsContext *filter_context; |
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51 | } FilterParam; |
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52 | |||
53 | typedef struct { |
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54 | const AVClass *class; |
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55 | FilterParam luma; |
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56 | FilterParam chroma; |
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57 | int hsub; |
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58 | int vsub; |
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59 | unsigned int sws_flags; |
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60 | } SmartblurContext; |
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61 | |||
62 | #define OFFSET(x) offsetof(SmartblurContext, x) |
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63 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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64 | |||
65 | static const AVOption smartblur_options[] = { |
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66 | { "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
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67 | { "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
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68 | { "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
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69 | { "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
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70 | { "luma_threshold", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS }, |
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71 | { "lt", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS }, |
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72 | |||
73 | { "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
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74 | { "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
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75 | { "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
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76 | { "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
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77 | { "chroma_threshold", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS }, |
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78 | { "ct", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS }, |
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79 | |||
80 | { NULL } |
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81 | }; |
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82 | |||
83 | AVFILTER_DEFINE_CLASS(smartblur); |
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84 | |||
85 | static av_cold int init(AVFilterContext *ctx) |
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86 | { |
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87 | SmartblurContext *sblur = ctx->priv; |
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88 | |||
89 | /* make chroma default to luma values, if not explicitly set */ |
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90 | if (sblur->chroma.radius < RADIUS_MIN) |
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91 | sblur->chroma.radius = sblur->luma.radius; |
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92 | if (sblur->chroma.strength < STRENGTH_MIN) |
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93 | sblur->chroma.strength = sblur->luma.strength; |
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94 | if (sblur->chroma.threshold < THRESHOLD_MIN) |
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95 | sblur->chroma.threshold = sblur->luma.threshold; |
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96 | |||
97 | sblur->luma.quality = sblur->chroma.quality = 3.0; |
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98 | sblur->sws_flags = SWS_BICUBIC; |
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99 | |||
100 | av_log(ctx, AV_LOG_VERBOSE, |
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101 | "luma_radius:%f luma_strength:%f luma_threshold:%d " |
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102 | "chroma_radius:%f chroma_strength:%f chroma_threshold:%d\n", |
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103 | sblur->luma.radius, sblur->luma.strength, sblur->luma.threshold, |
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104 | sblur->chroma.radius, sblur->chroma.strength, sblur->chroma.threshold); |
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105 | |||
106 | return 0; |
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107 | } |
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108 | |||
109 | static av_cold void uninit(AVFilterContext *ctx) |
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110 | { |
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111 | SmartblurContext *sblur = ctx->priv; |
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112 | |||
113 | sws_freeContext(sblur->luma.filter_context); |
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114 | sws_freeContext(sblur->chroma.filter_context); |
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115 | } |
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116 | |||
117 | static int query_formats(AVFilterContext *ctx) |
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118 | { |
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119 | static const enum AVPixelFormat pix_fmts[] = { |
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120 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, |
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121 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, |
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122 | AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, |
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123 | AV_PIX_FMT_GRAY8, |
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124 | AV_PIX_FMT_NONE |
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125 | }; |
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126 | |||
127 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
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128 | |||
129 | return 0; |
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130 | } |
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131 | |||
132 | static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags) |
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133 | { |
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134 | SwsVector *vec; |
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135 | SwsFilter sws_filter; |
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136 | |||
137 | vec = sws_getGaussianVec(f->radius, f->quality); |
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138 | |||
139 | if (!vec) |
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140 | return AVERROR(EINVAL); |
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141 | |||
142 | sws_scaleVec(vec, f->strength); |
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143 | vec->coeff[vec->length / 2] += 1.0 - f->strength; |
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144 | sws_filter.lumH = sws_filter.lumV = vec; |
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145 | sws_filter.chrH = sws_filter.chrV = NULL; |
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146 | f->filter_context = sws_getCachedContext(NULL, |
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147 | width, height, AV_PIX_FMT_GRAY8, |
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148 | width, height, AV_PIX_FMT_GRAY8, |
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149 | flags, &sws_filter, NULL, NULL); |
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150 | |||
151 | sws_freeVec(vec); |
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152 | |||
153 | if (!f->filter_context) |
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154 | return AVERROR(EINVAL); |
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155 | |||
156 | return 0; |
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157 | } |
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158 | |||
159 | static int config_props(AVFilterLink *inlink) |
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160 | { |
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161 | SmartblurContext *sblur = inlink->dst->priv; |
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162 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
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163 | |||
164 | sblur->hsub = desc->log2_chroma_w; |
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165 | sblur->vsub = desc->log2_chroma_h; |
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166 | |||
167 | alloc_sws_context(&sblur->luma, inlink->w, inlink->h, sblur->sws_flags); |
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168 | alloc_sws_context(&sblur->chroma, |
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169 | FF_CEIL_RSHIFT(inlink->w, sblur->hsub), |
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170 | FF_CEIL_RSHIFT(inlink->h, sblur->vsub), |
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171 | sblur->sws_flags); |
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172 | |||
173 | return 0; |
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174 | } |
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175 | |||
176 | static void blur(uint8_t *dst, const int dst_linesize, |
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177 | const uint8_t *src, const int src_linesize, |
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178 | const int w, const int h, const int threshold, |
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179 | struct SwsContext *filter_context) |
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180 | { |
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181 | int x, y; |
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182 | int orig, filtered; |
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183 | int diff; |
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184 | /* Declare arrays of 4 to get aligned data */ |
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185 | const uint8_t* const src_array[4] = {src}; |
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186 | uint8_t *dst_array[4] = {dst}; |
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187 | int src_linesize_array[4] = {src_linesize}; |
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188 | int dst_linesize_array[4] = {dst_linesize}; |
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189 | |||
190 | sws_scale(filter_context, src_array, src_linesize_array, |
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191 | 0, h, dst_array, dst_linesize_array); |
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192 | |||
193 | if (threshold > 0) { |
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194 | for (y = 0; y < h; ++y) { |
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195 | for (x = 0; x < w; ++x) { |
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196 | orig = src[x + y * src_linesize]; |
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197 | filtered = dst[x + y * dst_linesize]; |
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198 | diff = orig - filtered; |
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199 | |||
200 | if (diff > 0) { |
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201 | if (diff > 2 * threshold) |
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202 | dst[x + y * dst_linesize] = orig; |
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203 | else if (diff > threshold) |
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204 | /* add 'diff' and substract 'threshold' from 'filtered' */ |
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205 | dst[x + y * dst_linesize] = orig - threshold; |
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206 | } else { |
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207 | if (-diff > 2 * threshold) |
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208 | dst[x + y * dst_linesize] = orig; |
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209 | else if (-diff > threshold) |
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210 | /* add 'diff' and 'threshold' to 'filtered' */ |
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211 | dst[x + y * dst_linesize] = orig + threshold; |
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212 | } |
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213 | } |
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214 | } |
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215 | } else if (threshold < 0) { |
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216 | for (y = 0; y < h; ++y) { |
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217 | for (x = 0; x < w; ++x) { |
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218 | orig = src[x + y * src_linesize]; |
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219 | filtered = dst[x + y * dst_linesize]; |
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220 | diff = orig - filtered; |
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221 | |||
222 | if (diff > 0) { |
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223 | if (diff <= -threshold) |
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224 | dst[x + y * dst_linesize] = orig; |
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225 | else if (diff <= -2 * threshold) |
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226 | /* substract 'diff' and 'threshold' from 'orig' */ |
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227 | dst[x + y * dst_linesize] = filtered - threshold; |
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228 | } else { |
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229 | if (diff >= threshold) |
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230 | dst[x + y * dst_linesize] = orig; |
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231 | else if (diff >= 2 * threshold) |
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232 | /* add 'threshold' and substract 'diff' from 'orig' */ |
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233 | dst[x + y * dst_linesize] = filtered + threshold; |
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234 | } |
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235 | } |
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236 | } |
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237 | } |
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238 | } |
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239 | |||
240 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) |
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241 | { |
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242 | SmartblurContext *sblur = inlink->dst->priv; |
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243 | AVFilterLink *outlink = inlink->dst->outputs[0]; |
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244 | AVFrame *outpic; |
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245 | int cw = FF_CEIL_RSHIFT(inlink->w, sblur->hsub); |
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246 | int ch = FF_CEIL_RSHIFT(inlink->h, sblur->vsub); |
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247 | |||
248 | outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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249 | if (!outpic) { |
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250 | av_frame_free(&inpic); |
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251 | return AVERROR(ENOMEM); |
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252 | } |
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253 | av_frame_copy_props(outpic, inpic); |
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254 | |||
255 | blur(outpic->data[0], outpic->linesize[0], |
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256 | inpic->data[0], inpic->linesize[0], |
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257 | inlink->w, inlink->h, sblur->luma.threshold, |
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258 | sblur->luma.filter_context); |
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259 | |||
260 | if (inpic->data[2]) { |
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261 | blur(outpic->data[1], outpic->linesize[1], |
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262 | inpic->data[1], inpic->linesize[1], |
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263 | cw, ch, sblur->chroma.threshold, |
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264 | sblur->chroma.filter_context); |
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265 | blur(outpic->data[2], outpic->linesize[2], |
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266 | inpic->data[2], inpic->linesize[2], |
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267 | cw, ch, sblur->chroma.threshold, |
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268 | sblur->chroma.filter_context); |
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269 | } |
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270 | |||
271 | av_frame_free(&inpic); |
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272 | return ff_filter_frame(outlink, outpic); |
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273 | } |
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274 | |||
275 | static const AVFilterPad smartblur_inputs[] = { |
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276 | { |
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277 | .name = "default", |
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278 | .type = AVMEDIA_TYPE_VIDEO, |
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279 | .filter_frame = filter_frame, |
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280 | .config_props = config_props, |
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281 | }, |
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282 | { NULL } |
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283 | }; |
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284 | |||
285 | static const AVFilterPad smartblur_outputs[] = { |
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286 | { |
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287 | .name = "default", |
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288 | .type = AVMEDIA_TYPE_VIDEO, |
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289 | }, |
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290 | { NULL } |
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291 | }; |
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292 | |||
293 | AVFilter avfilter_vf_smartblur = { |
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294 | .name = "smartblur", |
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295 | .description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."), |
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296 | .priv_size = sizeof(SmartblurContext), |
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297 | .init = init, |
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298 | .uninit = uninit, |
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299 | .query_formats = query_formats, |
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300 | .inputs = smartblur_inputs, |
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301 | .outputs = smartblur_outputs, |
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302 | .priv_class = &smartblur_class, |
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303 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
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304 | };=>=>>>>>>>>> |