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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2010 Nolan Lum |
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3 | * Copyright (c) 2009 Loren Merritt |
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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 |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (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 GNU |
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15 | * Lesser 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 Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 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 | * gradfun debanding filter, ported from MPlayer |
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25 | * libmpcodecs/vf_gradfun.c |
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26 | * |
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27 | * Apply a boxblur debanding algorithm (based on the gradfun2db |
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28 | * AviSynth filter by prunedtree). |
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29 | * Foreach pixel, if it's within threshold of the blurred value, make it closer. |
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30 | * So now we have a smoothed and higher bitdepth version of all the shallow |
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31 | * gradients, while leaving detailed areas untouched. |
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32 | * Dither it back to 8bit. |
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33 | */ |
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34 | |||
35 | #include "libavutil/imgutils.h" |
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36 | #include "libavutil/common.h" |
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37 | #include "libavutil/cpu.h" |
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38 | #include "libavutil/opt.h" |
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39 | #include "libavutil/pixdesc.h" |
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40 | #include "avfilter.h" |
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41 | #include "formats.h" |
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42 | #include "gradfun.h" |
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43 | #include "internal.h" |
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44 | #include "video.h" |
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45 | |||
46 | DECLARE_ALIGNED(16, static const uint16_t, dither)[8][8] = { |
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47 | {0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E}, |
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48 | {0x40,0x20,0x58,0x38,0x46,0x26,0x5E,0x3E}, |
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49 | {0x10,0x70,0x08,0x68,0x16,0x76,0x0E,0x6E}, |
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50 | {0x50,0x30,0x48,0x28,0x56,0x36,0x4E,0x2E}, |
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51 | {0x04,0x64,0x1C,0x7C,0x02,0x62,0x1A,0x7A}, |
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52 | {0x44,0x24,0x5C,0x3C,0x42,0x22,0x5A,0x3A}, |
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53 | {0x14,0x74,0x0C,0x6C,0x12,0x72,0x0A,0x6A}, |
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54 | {0x54,0x34,0x4C,0x2C,0x52,0x32,0x4A,0x2A}, |
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55 | }; |
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56 | |||
57 | void ff_gradfun_filter_line_c(uint8_t *dst, const uint8_t *src, const uint16_t *dc, int width, int thresh, const uint16_t *dithers) |
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58 | { |
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59 | int x; |
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60 | for (x = 0; x < width; dc += x & 1, x++) { |
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61 | int pix = src[x] << 7; |
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62 | int delta = dc[0] - pix; |
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63 | int m = abs(delta) * thresh >> 16; |
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64 | m = FFMAX(0, 127 - m); |
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65 | m = m * m * delta >> 14; |
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66 | pix += m + dithers[x & 7]; |
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67 | dst[x] = av_clip_uint8(pix >> 7); |
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68 | } |
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69 | } |
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70 | |||
71 | void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, const uint16_t *buf1, const uint8_t *src, int src_linesize, int width) |
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72 | { |
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73 | int x, v, old; |
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74 | for (x = 0; x < width; x++) { |
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75 | v = buf1[x] + src[2 * x] + src[2 * x + 1] + src[2 * x + src_linesize] + src[2 * x + 1 + src_linesize]; |
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76 | old = buf[x]; |
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77 | buf[x] = v; |
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78 | dc[x] = v - old; |
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79 | } |
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80 | } |
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81 | |||
82 | static void filter(GradFunContext *ctx, uint8_t *dst, const uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r) |
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83 | { |
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84 | int bstride = FFALIGN(width, 16) / 2; |
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85 | int y; |
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86 | uint32_t dc_factor = (1 << 21) / (r * r); |
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87 | uint16_t *dc = ctx->buf + 16; |
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88 | uint16_t *buf = ctx->buf + bstride + 32; |
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89 | int thresh = ctx->thresh; |
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90 | |||
91 | memset(dc, 0, (bstride + 16) * sizeof(*buf)); |
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92 | for (y = 0; y < r; y++) |
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93 | ctx->blur_line(dc, buf + y * bstride, buf + (y - 1) * bstride, src + 2 * y * src_linesize, src_linesize, width / 2); |
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94 | for (;;) { |
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95 | if (y < height - r) { |
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96 | int mod = ((y + r) / 2) % r; |
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97 | uint16_t *buf0 = buf + mod * bstride; |
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98 | uint16_t *buf1 = buf + (mod ? mod - 1 : r - 1) * bstride; |
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99 | int x, v; |
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100 | ctx->blur_line(dc, buf0, buf1, src + (y + r) * src_linesize, src_linesize, width / 2); |
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101 | for (x = v = 0; x < r; x++) |
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102 | v += dc[x]; |
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103 | for (; x < width / 2; x++) { |
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104 | v += dc[x] - dc[x-r]; |
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105 | dc[x-r] = v * dc_factor >> 16; |
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106 | } |
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107 | for (; x < (width + r + 1) / 2; x++) |
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108 | dc[x-r] = v * dc_factor >> 16; |
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109 | for (x = -r / 2; x < 0; x++) |
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110 | dc[x] = dc[0]; |
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111 | } |
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112 | if (y == r) { |
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113 | for (y = 0; y < r; y++) |
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114 | ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); |
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115 | } |
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116 | ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); |
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117 | if (++y >= height) break; |
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118 | ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); |
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119 | if (++y >= height) break; |
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120 | } |
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121 | } |
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122 | |||
123 | static av_cold int init(AVFilterContext *ctx) |
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124 | { |
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125 | GradFunContext *s = ctx->priv; |
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126 | |||
127 | s->thresh = (1 << 15) / s->strength; |
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128 | s->radius = av_clip((s->radius + 1) & ~1, 4, 32); |
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129 | |||
130 | s->blur_line = ff_gradfun_blur_line_c; |
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131 | s->filter_line = ff_gradfun_filter_line_c; |
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132 | |||
133 | if (ARCH_X86) |
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134 | ff_gradfun_init_x86(s); |
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135 | |||
136 | av_log(ctx, AV_LOG_VERBOSE, "threshold:%.2f radius:%d\n", s->strength, s->radius); |
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137 | |||
138 | return 0; |
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139 | } |
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140 | |||
141 | static av_cold void uninit(AVFilterContext *ctx) |
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142 | { |
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143 | GradFunContext *s = ctx->priv; |
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144 | av_freep(&s->buf); |
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145 | } |
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146 | |||
147 | static int query_formats(AVFilterContext *ctx) |
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148 | { |
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149 | static const enum AVPixelFormat pix_fmts[] = { |
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150 | AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P, |
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151 | AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUV444P, |
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152 | AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P, |
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153 | AV_PIX_FMT_YUV440P, |
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154 | AV_PIX_FMT_GBRP, |
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155 | AV_PIX_FMT_NONE |
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156 | }; |
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157 | |||
158 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
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159 | |||
160 | return 0; |
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161 | } |
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162 | |||
163 | static int config_input(AVFilterLink *inlink) |
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164 | { |
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165 | GradFunContext *s = inlink->dst->priv; |
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166 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
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167 | int hsub = desc->log2_chroma_w; |
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168 | int vsub = desc->log2_chroma_h; |
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169 | |||
170 | av_freep(&s->buf); |
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171 | s->buf = av_calloc((FFALIGN(inlink->w, 16) * (s->radius + 1) / 2 + 32), sizeof(*s->buf)); |
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172 | if (!s->buf) |
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173 | return AVERROR(ENOMEM); |
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174 | |||
175 | s->chroma_w = FF_CEIL_RSHIFT(inlink->w, hsub); |
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176 | s->chroma_h = FF_CEIL_RSHIFT(inlink->h, vsub); |
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177 | s->chroma_r = av_clip(((((s->radius >> hsub) + (s->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32); |
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178 | |||
179 | return 0; |
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180 | } |
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181 | |||
182 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
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183 | { |
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184 | GradFunContext *s = inlink->dst->priv; |
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185 | AVFilterLink *outlink = inlink->dst->outputs[0]; |
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186 | AVFrame *out; |
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187 | int p, direct; |
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188 | |||
189 | if (av_frame_is_writable(in)) { |
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190 | direct = 1; |
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191 | out = in; |
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192 | } else { |
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193 | direct = 0; |
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194 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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195 | if (!out) { |
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196 | av_frame_free(&in); |
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197 | return AVERROR(ENOMEM); |
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198 | } |
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199 | av_frame_copy_props(out, in); |
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200 | } |
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201 | |||
202 | for (p = 0; p < 4 && in->data[p] && in->linesize[p]; p++) { |
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203 | int w = inlink->w; |
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204 | int h = inlink->h; |
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205 | int r = s->radius; |
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206 | if (p) { |
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207 | w = s->chroma_w; |
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208 | h = s->chroma_h; |
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209 | r = s->chroma_r; |
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210 | } |
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211 | |||
212 | if (FFMIN(w, h) > 2 * r) |
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213 | filter(s, out->data[p], in->data[p], w, h, out->linesize[p], in->linesize[p], r); |
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214 | else if (out->data[p] != in->data[p]) |
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215 | av_image_copy_plane(out->data[p], out->linesize[p], in->data[p], in->linesize[p], w, h); |
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216 | } |
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217 | |||
218 | if (!direct) |
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219 | av_frame_free(&in); |
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220 | |||
221 | return ff_filter_frame(outlink, out); |
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222 | } |
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223 | |||
224 | #define OFFSET(x) offsetof(GradFunContext, x) |
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225 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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226 | |||
227 | static const AVOption gradfun_options[] = { |
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228 | { "strength", "The maximum amount by which the filter will change any one pixel.", OFFSET(strength), AV_OPT_TYPE_FLOAT, { .dbl = 1.2 }, 0.51, 64, FLAGS }, |
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229 | { "radius", "The neighborhood to fit the gradient to.", OFFSET(radius), AV_OPT_TYPE_INT, { .i64 = 16 }, 4, 32, FLAGS }, |
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230 | { NULL } |
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231 | }; |
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232 | |||
233 | AVFILTER_DEFINE_CLASS(gradfun); |
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234 | |||
235 | static const AVFilterPad avfilter_vf_gradfun_inputs[] = { |
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236 | { |
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237 | .name = "default", |
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238 | .type = AVMEDIA_TYPE_VIDEO, |
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239 | .config_props = config_input, |
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240 | .filter_frame = filter_frame, |
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241 | }, |
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242 | { NULL } |
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243 | }; |
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244 | |||
245 | static const AVFilterPad avfilter_vf_gradfun_outputs[] = { |
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246 | { |
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247 | .name = "default", |
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248 | .type = AVMEDIA_TYPE_VIDEO, |
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249 | }, |
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250 | { NULL } |
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251 | }; |
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252 | |||
253 | AVFilter avfilter_vf_gradfun = { |
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254 | .name = "gradfun", |
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255 | .description = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."), |
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256 | .priv_size = sizeof(GradFunContext), |
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257 | .priv_class = &gradfun_class, |
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258 | .init = init, |
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259 | .uninit = uninit, |
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260 | .query_formats = query_formats, |
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261 | .inputs = avfilter_vf_gradfun_inputs, |
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262 | .outputs = avfilter_vf_gradfun_outputs, |
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263 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
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264 | };>><>>>>>>>>><>>><>> |