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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2003 Rich Felker |
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3 | * Copyright (c) 2012 Stefano Sabatini |
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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 mpdecimate filter, ported from libmpcodecs/vf_decimate.c by |
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24 | * Rich Felker. |
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25 | */ |
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26 | |||
27 | #include "libavutil/opt.h" |
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28 | #include "libavutil/pixdesc.h" |
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29 | #include "libavutil/timestamp.h" |
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30 | #include "libavcodec/dsputil.h" |
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31 | #include "avfilter.h" |
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32 | #include "internal.h" |
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33 | #include "formats.h" |
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34 | #include "video.h" |
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35 | |||
36 | typedef struct { |
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37 | const AVClass *class; |
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38 | int lo, hi; ///< lower and higher threshold number of differences |
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39 | ///< values for 8x8 blocks |
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40 | |||
41 | float frac; ///< threshold of changed pixels over the total fraction |
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42 | |||
43 | int max_drop_count; ///< if positive: maximum number of sequential frames to drop |
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44 | ///< if negative: minimum number of frames between two drops |
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45 | |||
46 | int drop_count; ///< if positive: number of frames sequentially dropped |
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47 | ///< if negative: number of sequential frames which were not dropped |
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48 | |||
49 | int hsub, vsub; ///< chroma subsampling values |
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50 | AVFrame *ref; ///< reference picture |
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51 | DSPContext dspctx; ///< context providing optimized diff routines |
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52 | AVCodecContext *avctx; ///< codec context required for the DSPContext |
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53 | } DecimateContext; |
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54 | |||
55 | #define OFFSET(x) offsetof(DecimateContext, x) |
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56 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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57 | |||
58 | static const AVOption mpdecimate_options[] = { |
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59 | { "max", "set the maximum number of consecutive dropped frames (positive), or the minimum interval between dropped frames (negative)", |
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60 | OFFSET(max_drop_count), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, FLAGS }, |
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61 | { "hi", "set high dropping threshold", OFFSET(hi), AV_OPT_TYPE_INT, {.i64=64*12}, INT_MIN, INT_MAX, FLAGS }, |
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62 | { "lo", "set low dropping threshold", OFFSET(lo), AV_OPT_TYPE_INT, {.i64=64*5}, INT_MIN, INT_MAX, FLAGS }, |
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63 | { "frac", "set fraction dropping threshold", OFFSET(frac), AV_OPT_TYPE_FLOAT, {.dbl=0.33}, 0, 1, FLAGS }, |
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64 | { NULL } |
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65 | }; |
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66 | |||
67 | AVFILTER_DEFINE_CLASS(mpdecimate); |
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68 | |||
69 | /** |
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70 | * Return 1 if the two planes are different, 0 otherwise. |
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71 | */ |
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72 | static int diff_planes(AVFilterContext *ctx, |
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73 | uint8_t *cur, uint8_t *ref, int linesize, |
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74 | int w, int h) |
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75 | { |
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76 | DecimateContext *decimate = ctx->priv; |
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77 | DSPContext *dspctx = &decimate->dspctx; |
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78 | |||
79 | int x, y; |
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80 | int d, c = 0; |
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81 | int t = (w/16)*(h/16)*decimate->frac; |
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82 | int16_t block[8*8]; |
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83 | |||
84 | /* compute difference for blocks of 8x8 bytes */ |
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85 | for (y = 0; y < h-7; y += 4) { |
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86 | for (x = 8; x < w-7; x += 4) { |
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87 | dspctx->diff_pixels(block, |
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88 | cur+x+y*linesize, |
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89 | ref+x+y*linesize, linesize); |
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90 | d = dspctx->sum_abs_dctelem(block); |
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91 | if (d > decimate->hi) |
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92 | return 1; |
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93 | if (d > decimate->lo) { |
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94 | c++; |
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95 | if (c > t) |
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96 | return 1; |
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97 | } |
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98 | } |
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99 | } |
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100 | return 0; |
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101 | } |
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102 | |||
103 | /** |
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104 | * Tell if the frame should be decimated, for example if it is no much |
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105 | * different with respect to the reference frame ref. |
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106 | */ |
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107 | static int decimate_frame(AVFilterContext *ctx, |
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108 | AVFrame *cur, AVFrame *ref) |
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109 | { |
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110 | DecimateContext *decimate = ctx->priv; |
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111 | int plane; |
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112 | |||
113 | if (decimate->max_drop_count > 0 && |
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114 | decimate->drop_count >= decimate->max_drop_count) |
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115 | return 0; |
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116 | if (decimate->max_drop_count < 0 && |
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117 | (decimate->drop_count-1) > decimate->max_drop_count) |
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118 | return 0; |
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119 | |||
120 | for (plane = 0; ref->data[plane] && ref->linesize[plane]; plane++) { |
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121 | int vsub = plane == 1 || plane == 2 ? decimate->vsub : 0; |
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122 | int hsub = plane == 1 || plane == 2 ? decimate->hsub : 0; |
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123 | if (diff_planes(ctx, |
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124 | cur->data[plane], ref->data[plane], ref->linesize[plane], |
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125 | FF_CEIL_RSHIFT(ref->width, hsub), |
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126 | FF_CEIL_RSHIFT(ref->height, vsub))) |
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127 | return 0; |
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128 | } |
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129 | |||
130 | return 1; |
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131 | } |
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132 | |||
133 | static av_cold int init(AVFilterContext *ctx) |
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134 | { |
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135 | DecimateContext *decimate = ctx->priv; |
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136 | |||
137 | av_log(ctx, AV_LOG_VERBOSE, "max_drop_count:%d hi:%d lo:%d frac:%f\n", |
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138 | decimate->max_drop_count, decimate->hi, decimate->lo, decimate->frac); |
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139 | |||
140 | decimate->avctx = avcodec_alloc_context3(NULL); |
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141 | if (!decimate->avctx) |
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142 | return AVERROR(ENOMEM); |
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143 | avpriv_dsputil_init(&decimate->dspctx, decimate->avctx); |
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144 | |||
145 | return 0; |
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146 | } |
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147 | |||
148 | static av_cold void uninit(AVFilterContext *ctx) |
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149 | { |
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150 | DecimateContext *decimate = ctx->priv; |
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151 | av_frame_free(&decimate->ref); |
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152 | if (decimate->avctx) { |
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153 | avcodec_close(decimate->avctx); |
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154 | av_freep(&decimate->avctx); |
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155 | } |
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156 | } |
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157 | |||
158 | static int query_formats(AVFilterContext *ctx) |
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159 | { |
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160 | static const enum AVPixelFormat pix_fmts[] = { |
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161 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, |
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162 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, |
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163 | AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, |
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164 | AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, |
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165 | AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P, |
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166 | AV_PIX_FMT_YUVA420P, |
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167 | AV_PIX_FMT_NONE |
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168 | }; |
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169 | |||
170 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
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171 | |||
172 | return 0; |
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173 | } |
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174 | |||
175 | static int config_input(AVFilterLink *inlink) |
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176 | { |
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177 | AVFilterContext *ctx = inlink->dst; |
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178 | DecimateContext *decimate = ctx->priv; |
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179 | const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format); |
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180 | decimate->hsub = pix_desc->log2_chroma_w; |
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181 | decimate->vsub = pix_desc->log2_chroma_h; |
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182 | |||
183 | return 0; |
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184 | } |
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185 | |||
186 | static int filter_frame(AVFilterLink *inlink, AVFrame *cur) |
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187 | { |
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188 | DecimateContext *decimate = inlink->dst->priv; |
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189 | AVFilterLink *outlink = inlink->dst->outputs[0]; |
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190 | int ret; |
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191 | |||
192 | if (decimate->ref && decimate_frame(inlink->dst, cur, decimate->ref)) { |
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193 | decimate->drop_count = FFMAX(1, decimate->drop_count+1); |
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194 | } else { |
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195 | av_frame_free(&decimate->ref); |
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196 | decimate->ref = cur; |
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197 | decimate->drop_count = FFMIN(-1, decimate->drop_count-1); |
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198 | |||
199 | if (ret = ff_filter_frame(outlink, av_frame_clone(cur)) < 0) |
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200 | return ret; |
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201 | } |
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202 | |||
203 | av_log(inlink->dst, AV_LOG_DEBUG, |
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204 | "%s pts:%s pts_time:%s drop_count:%d\n", |
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205 | decimate->drop_count > 0 ? "drop" : "keep", |
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206 | av_ts2str(cur->pts), av_ts2timestr(cur->pts, &inlink->time_base), |
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207 | decimate->drop_count); |
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208 | |||
209 | if (decimate->drop_count > 0) |
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210 | av_frame_free(&cur); |
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211 | |||
212 | return 0; |
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213 | } |
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214 | |||
215 | static int request_frame(AVFilterLink *outlink) |
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216 | { |
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217 | DecimateContext *decimate = outlink->src->priv; |
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218 | AVFilterLink *inlink = outlink->src->inputs[0]; |
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219 | int ret; |
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220 | |||
221 | do { |
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222 | ret = ff_request_frame(inlink); |
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223 | } while (decimate->drop_count > 0 && ret >= 0); |
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224 | |||
225 | return ret; |
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226 | } |
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227 | |||
228 | static const AVFilterPad mpdecimate_inputs[] = { |
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229 | { |
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230 | .name = "default", |
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231 | .type = AVMEDIA_TYPE_VIDEO, |
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232 | .config_props = config_input, |
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233 | .filter_frame = filter_frame, |
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234 | }, |
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235 | { NULL } |
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236 | }; |
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237 | |||
238 | static const AVFilterPad mpdecimate_outputs[] = { |
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239 | { |
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240 | .name = "default", |
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241 | .type = AVMEDIA_TYPE_VIDEO, |
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242 | .request_frame = request_frame, |
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243 | }, |
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244 | { NULL } |
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245 | }; |
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246 | |||
247 | AVFilter avfilter_vf_mpdecimate = { |
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248 | .name = "mpdecimate", |
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249 | .description = NULL_IF_CONFIG_SMALL("Remove near-duplicate frames."), |
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250 | .init = init, |
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251 | .uninit = uninit, |
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252 | .priv_size = sizeof(DecimateContext), |
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253 | .priv_class = &mpdecimate_class, |
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254 | .query_formats = query_formats, |
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255 | .inputs = mpdecimate_inputs, |
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256 | .outputs = mpdecimate_outputs, |
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257 | };>>>>>>>>>>>>>>> |