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1 /*
2  * Copyright (c) 2016 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/opt.h"
22 #include "libavutil/imgutils.h"
23 #include "avfilter.h"
24 #include "formats.h"
25 #include "internal.h"
26 #include "video.h"
27 
28 typedef struct BPNContext {
29     const AVClass *class;
30 
31     int bitplane;
32     int filter;
33 
34     int nb_planes;
35     int planeheight[4];
36     int planewidth[4];
37     int depth;
38 } BPNContext;
39 
40 #define OFFSET(x) offsetof(BPNContext, x)
41 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
42 static const AVOption bitplanenoise_options[] = {
43     { "bitplane", "set bit plane to use for measuring noise",  OFFSET(bitplane), AV_OPT_TYPE_INT,  {.i64=1}, 1, 16, FLAGS},
44     { "filter",   "show noisy pixels",                         OFFSET(filter),   AV_OPT_TYPE_BOOL, {.i64=0}, 0,  1, FLAGS},
45     { NULL }
46 };
47 
48 AVFILTER_DEFINE_CLASS(bitplanenoise);
49 
50 static const enum AVPixelFormat pixfmts[] = {
51     AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
52     AV_PIX_FMT_YUV440P,
53     AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
54     AV_PIX_FMT_YUVJ440P,
55     AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV420P9,
56     AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10,
57     AV_PIX_FMT_YUV440P10,
58     AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
59     AV_PIX_FMT_YUV440P12,
60     AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
61     AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV420P16,
62     AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
63     AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
64     AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
65     AV_PIX_FMT_NONE
66 };
67 
config_input(AVFilterLink * inlink)68 static int config_input(AVFilterLink *inlink)
69 {
70     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
71     AVFilterContext *ctx = inlink->dst;
72     BPNContext *s = ctx->priv;
73 
74     s->nb_planes = desc->nb_components;
75 
76     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
77     s->planeheight[0] = s->planeheight[3] = inlink->h;
78     s->planewidth[1]  = s->planewidth[2]  = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
79     s->planewidth[0]  = s->planewidth[3]  = inlink->w;
80 
81     s->depth = desc->comp[0].depth;
82 
83     return 0;
84 }
85 
86 #define CHECK_BIT(x, a, b, c) { \
87     bit = (((val[(x)] & mask) == (val[(x) + (a)] & mask)) + \
88            ((val[(x)] & mask) == (val[(x) + (b)] & mask)) + \
89            ((val[(x)] & mask) == (val[(x) + (c)] & mask))) > 1; \
90     if (dst) \
91         dst[(x)] = factor * bit; \
92     stats[plane] += bit; }
93 
filter_frame(AVFilterLink * inlink,AVFrame * in)94 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
95 {
96     AVFilterContext *ctx = inlink->dst;
97     AVFilterLink *outlink = ctx->outputs[0];
98     BPNContext *s = ctx->priv;
99     const int mask = (1 << (s->bitplane - 1));
100     const int factor = (1 << s->depth) - 1;
101     float stats[4] = { 0 };
102     char metabuf[128];
103     int plane, y, x, bit;
104     AVFrame *out = s->filter ? NULL : in;
105 
106     if (!out) {
107         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
108         if (!out) {
109             av_frame_free(&in);
110             return AVERROR(ENOMEM);
111         }
112         av_frame_copy_props(out, in);
113     }
114 
115     if (s->depth <= 8) {
116         for (plane = 0; plane < s->nb_planes; plane++) {
117             const int linesize = s->planeheight[plane] > 1 ? in->linesize[plane] : 0;
118             const int dlinesize = out->linesize[plane];
119             uint8_t *val = in->data[plane];
120             uint8_t *dst = s->filter ? out->data[plane]: NULL;
121 
122             for (y = 0; y < s->planeheight[plane] - 1; y++) {
123                 CHECK_BIT(0, 1, 1 + linesize, linesize)
124 
125                 for (x = 1; x < s->planewidth[plane] - 1; x++) {
126                     CHECK_BIT(x, -1, 1, linesize)
127                 }
128 
129                 CHECK_BIT(x, -1, -1 + linesize, linesize)
130 
131                 val += linesize;
132                 if (dst)
133                     dst += dlinesize;
134             }
135 
136             CHECK_BIT(0, 1, 1 - linesize, -linesize)
137 
138             for (x = 1; x < s->planewidth[plane] - 1; x++) {
139                 CHECK_BIT(x, -1, 1, -linesize)
140             }
141 
142             CHECK_BIT(x, -1, -1 - linesize, -linesize)
143         }
144     } else {
145         for (plane = 0; plane < s->nb_planes; plane++) {
146             const int linesize = s->planeheight[plane] > 1 ? in->linesize[plane] / 2 : 0;
147             const int dlinesize = out->linesize[plane] / 2;
148             uint16_t *val = (uint16_t *)in->data[plane];
149             uint16_t *dst = s->filter ? (uint16_t *)out->data[plane] : NULL;
150 
151             val = (uint16_t *)in->data[plane];
152             for (y = 0; y < s->planeheight[plane] - 1; y++) {
153                 CHECK_BIT(0, 1, 1 + linesize, linesize)
154 
155                 for (x = 1; x < s->planewidth[plane] - 1; x++) {
156                     CHECK_BIT(x, -1, 1, linesize)
157                 }
158 
159                 CHECK_BIT(x, -1, -1 + linesize, linesize)
160 
161                 val += linesize;
162                 if (dst)
163                     dst += dlinesize;
164             }
165 
166             CHECK_BIT(0, 1, 1 - linesize, -linesize)
167 
168             for (x = 1; x < s->planewidth[plane] - 1; x++) {
169                 CHECK_BIT(x, -1, 1, -linesize)
170             }
171 
172             CHECK_BIT(x, -1, -1 -linesize, -linesize)
173         }
174     }
175 
176     for (plane = 0; plane < s->nb_planes; plane++) {
177         char key[32];
178 
179         stats[plane] /= s->planewidth[plane] * s->planeheight[plane];
180         snprintf(key, sizeof(key), "lavfi.bitplanenoise.%d.%d", plane, s->bitplane);
181         snprintf(metabuf, sizeof(metabuf), "%f", 1. - 2.* fabs((stats[plane] - 0.5)));
182         av_dict_set(&out->metadata, key, metabuf, 0);
183     }
184 
185     if (out != in)
186         av_frame_free(&in);
187 
188     return ff_filter_frame(outlink, out);
189 }
190 
191 static const AVFilterPad inputs[] = {
192     {
193         .name           = "default",
194         .type           = AVMEDIA_TYPE_VIDEO,
195         .filter_frame   = filter_frame,
196         .config_props   = config_input,
197     },
198 };
199 
200 static const AVFilterPad outputs[] = {
201     {
202         .name = "default",
203         .type = AVMEDIA_TYPE_VIDEO,
204     },
205 };
206 
207 const AVFilter ff_vf_bitplanenoise = {
208     .name           = "bitplanenoise",
209     .description    = NULL_IF_CONFIG_SMALL("Measure bit plane noise."),
210     .priv_size      = sizeof(BPNContext),
211     FILTER_INPUTS(inputs),
212     FILTER_OUTPUTS(outputs),
213     FILTER_PIXFMTS_ARRAY(pixfmts),
214     .priv_class     = &bitplanenoise_class,
215     .flags          = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
216 };
217