| 1 | /* |
| 2 | * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> |
| 3 | * Copyright (c) 2013 Paul B Mahol |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * noise generator |
| 25 | */ |
| 26 | |
| 27 | #include "libavutil/opt.h" |
| 28 | #include "libavutil/imgutils.h" |
| 29 | #include "libavutil/lfg.h" |
| 30 | #include "libavutil/parseutils.h" |
| 31 | #include "libavutil/pixdesc.h" |
| 32 | #include "avfilter.h" |
| 33 | #include "formats.h" |
| 34 | #include "internal.h" |
| 35 | #include "vf_noise.h" |
| 36 | #include "video.h" |
| 37 | |
| 38 | typedef struct ThreadData { |
| 39 | AVFrame *in, *out; |
| 40 | } ThreadData; |
| 41 | |
| 42 | #define OFFSET(x) offsetof(NoiseContext, x) |
| 43 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| 44 | |
| 45 | #define NOISE_PARAMS(name, x, param) \ |
| 46 | {#name"_seed", "set component #"#x" noise seed", OFFSET(param.seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS}, \ |
| 47 | {#name"_strength", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \ |
| 48 | {#name"s", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \ |
| 49 | {#name"_flags", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \ |
| 50 | {#name"f", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \ |
| 51 | {"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, #name"_flags"}, \ |
| 52 | {"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, #name"_flags"}, \ |
| 53 | {"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, #name"_flags"}, \ |
| 54 | {"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, #name"_flags"}, |
| 55 | |
| 56 | static const AVOption noise_options[] = { |
| 57 | NOISE_PARAMS(all, 0, all) |
| 58 | NOISE_PARAMS(c0, 0, param[0]) |
| 59 | NOISE_PARAMS(c1, 1, param[1]) |
| 60 | NOISE_PARAMS(c2, 2, param[2]) |
| 61 | NOISE_PARAMS(c3, 3, param[3]) |
| 62 | {NULL} |
| 63 | }; |
| 64 | |
| 65 | AVFILTER_DEFINE_CLASS(noise); |
| 66 | |
| 67 | static const int8_t patt[4] = { -1, 0, 1, 0 }; |
| 68 | |
| 69 | #define RAND_N(range) ((int) ((double) range * av_lfg_get(lfg) / (UINT_MAX + 1.0))) |
| 70 | static av_cold int init_noise(NoiseContext *n, int comp) |
| 71 | { |
| 72 | int8_t *noise = av_malloc(MAX_NOISE * sizeof(int8_t)); |
| 73 | FilterParams *fp = &n->param[comp]; |
| 74 | AVLFG *lfg = &n->param[comp].lfg; |
| 75 | int strength = fp->strength; |
| 76 | int flags = fp->flags; |
| 77 | int i, j; |
| 78 | |
| 79 | if (!noise) |
| 80 | return AVERROR(ENOMEM); |
| 81 | |
| 82 | av_lfg_init(&fp->lfg, fp->seed + comp*31415U); |
| 83 | |
| 84 | for (i = 0, j = 0; i < MAX_NOISE; i++, j++) { |
| 85 | if (flags & NOISE_UNIFORM) { |
| 86 | if (flags & NOISE_AVERAGED) { |
| 87 | if (flags & NOISE_PATTERN) { |
| 88 | noise[i] = (RAND_N(strength) - strength / 2) / 6 |
| 89 | + patt[j % 4] * strength * 0.25 / 3; |
| 90 | } else { |
| 91 | noise[i] = (RAND_N(strength) - strength / 2) / 3; |
| 92 | } |
| 93 | } else { |
| 94 | if (flags & NOISE_PATTERN) { |
| 95 | noise[i] = (RAND_N(strength) - strength / 2) / 2 |
| 96 | + patt[j % 4] * strength * 0.25; |
| 97 | } else { |
| 98 | noise[i] = RAND_N(strength) - strength / 2; |
| 99 | } |
| 100 | } |
| 101 | } else { |
| 102 | double x1, x2, w, y1; |
| 103 | do { |
| 104 | x1 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0; |
| 105 | x2 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0; |
| 106 | w = x1 * x1 + x2 * x2; |
| 107 | } while (w >= 1.0); |
| 108 | |
| 109 | w = sqrt((-2.0 * log(w)) / w); |
| 110 | y1 = x1 * w; |
| 111 | y1 *= strength / sqrt(3.0); |
| 112 | if (flags & NOISE_PATTERN) { |
| 113 | y1 /= 2; |
| 114 | y1 += patt[j % 4] * strength * 0.35; |
| 115 | } |
| 116 | y1 = av_clipf(y1, -128, 127); |
| 117 | if (flags & NOISE_AVERAGED) |
| 118 | y1 /= 3.0; |
| 119 | noise[i] = (int)y1; |
| 120 | } |
| 121 | if (RAND_N(6) == 0) |
| 122 | j--; |
| 123 | } |
| 124 | |
| 125 | for (i = 0; i < MAX_RES; i++) |
| 126 | for (j = 0; j < 3; j++) |
| 127 | fp->prev_shift[i][j] = noise + (av_lfg_get(lfg) & (MAX_SHIFT - 1)); |
| 128 | |
| 129 | fp->noise = noise; |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | static int query_formats(AVFilterContext *ctx) |
| 134 | { |
| 135 | AVFilterFormats *formats = NULL; |
| 136 | int fmt; |
| 137 | |
| 138 | for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) { |
| 139 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); |
| 140 | if (desc->flags & AV_PIX_FMT_FLAG_PLANAR && !((desc->comp[0].depth_minus1 + 1) & 7)) |
| 141 | ff_add_format(&formats, fmt); |
| 142 | } |
| 143 | |
| 144 | ff_set_common_formats(ctx, formats); |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | static int config_input(AVFilterLink *inlink) |
| 149 | { |
| 150 | NoiseContext *n = inlink->dst->priv; |
| 151 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| 152 | int ret; |
| 153 | |
| 154 | n->nb_planes = av_pix_fmt_count_planes(inlink->format); |
| 155 | |
| 156 | if ((ret = av_image_fill_linesizes(n->bytewidth, inlink->format, inlink->w)) < 0) |
| 157 | return ret; |
| 158 | |
| 159 | n->height[1] = n->height[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); |
| 160 | n->height[0] = n->height[3] = inlink->h; |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | void ff_line_noise_c(uint8_t *dst, const uint8_t *src, const int8_t *noise, |
| 166 | int len, int shift) |
| 167 | { |
| 168 | int i; |
| 169 | |
| 170 | noise += shift; |
| 171 | for (i = 0; i < len; i++) { |
| 172 | int v = src[i] + noise[i]; |
| 173 | |
| 174 | dst[i] = av_clip_uint8(v); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | void ff_line_noise_avg_c(uint8_t *dst, const uint8_t *src, |
| 179 | int len, const int8_t * const *shift) |
| 180 | { |
| 181 | int i; |
| 182 | const int8_t *src2 = (const int8_t*)src; |
| 183 | |
| 184 | for (i = 0; i < len; i++) { |
| 185 | const int n = shift[0][i] + shift[1][i] + shift[2][i]; |
| 186 | dst[i] = src2[i] + ((n * src2[i]) >> 7); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | static void noise(uint8_t *dst, const uint8_t *src, |
| 191 | int dst_linesize, int src_linesize, |
| 192 | int width, int start, int end, NoiseContext *n, int comp) |
| 193 | { |
| 194 | FilterParams *p = &n->param[comp]; |
| 195 | int8_t *noise = p->noise; |
| 196 | const int flags = p->flags; |
| 197 | int y; |
| 198 | |
| 199 | if (!noise) { |
| 200 | if (dst != src) |
| 201 | av_image_copy_plane(dst, dst_linesize, src, src_linesize, width, end - start); |
| 202 | return; |
| 203 | } |
| 204 | |
| 205 | for (y = start; y < end; y++) { |
| 206 | const int ix = y & (MAX_RES - 1); |
| 207 | int x; |
| 208 | for (x=0; x < width; x+= MAX_RES) { |
| 209 | int w = FFMIN(width - x, MAX_RES); |
| 210 | int shift = p->rand_shift[ix]; |
| 211 | |
| 212 | if (flags & NOISE_AVERAGED) { |
| 213 | n->line_noise_avg(dst + x, src + x, w, (const int8_t**)p->prev_shift[ix]); |
| 214 | p->prev_shift[ix][shift & 3] = noise + shift; |
| 215 | } else { |
| 216 | n->line_noise(dst + x, src + x, noise, w, shift); |
| 217 | } |
| 218 | } |
| 219 | dst += dst_linesize; |
| 220 | src += src_linesize; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) |
| 225 | { |
| 226 | NoiseContext *s = ctx->priv; |
| 227 | ThreadData *td = arg; |
| 228 | int plane; |
| 229 | |
| 230 | for (plane = 0; plane < s->nb_planes; plane++) { |
| 231 | const int height = s->height[plane]; |
| 232 | const int start = (height * jobnr ) / nb_jobs; |
| 233 | const int end = (height * (jobnr+1)) / nb_jobs; |
| 234 | noise(td->out->data[plane] + start * td->out->linesize[plane], |
| 235 | td->in->data[plane] + start * td->in->linesize[plane], |
| 236 | td->out->linesize[plane], td->in->linesize[plane], |
| 237 | s->bytewidth[plane], start, end, s, plane); |
| 238 | } |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) |
| 243 | { |
| 244 | AVFilterContext *ctx = inlink->dst; |
| 245 | AVFilterLink *outlink = ctx->outputs[0]; |
| 246 | NoiseContext *n = ctx->priv; |
| 247 | ThreadData td; |
| 248 | AVFrame *out; |
| 249 | int comp, i; |
| 250 | |
| 251 | if (av_frame_is_writable(inpicref)) { |
| 252 | out = inpicref; |
| 253 | } else { |
| 254 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 255 | if (!out) { |
| 256 | av_frame_free(&inpicref); |
| 257 | return AVERROR(ENOMEM); |
| 258 | } |
| 259 | av_frame_copy_props(out, inpicref); |
| 260 | } |
| 261 | |
| 262 | for (comp = 0; comp < 4; comp++) { |
| 263 | FilterParams *fp = &n->param[comp]; |
| 264 | |
| 265 | if ((!fp->rand_shift_init || (fp->flags & NOISE_TEMPORAL)) && fp->strength) { |
| 266 | |
| 267 | for (i = 0; i < MAX_RES; i++) { |
| 268 | fp->rand_shift[i] = av_lfg_get(&fp->lfg) & (MAX_SHIFT - 1); |
| 269 | } |
| 270 | fp->rand_shift_init = 1; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | td.in = inpicref; td.out = out; |
| 275 | ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(n->height[0], ctx->graph->nb_threads)); |
| 276 | emms_c(); |
| 277 | |
| 278 | if (inpicref != out) |
| 279 | av_frame_free(&inpicref); |
| 280 | return ff_filter_frame(outlink, out); |
| 281 | } |
| 282 | |
| 283 | static av_cold int init(AVFilterContext *ctx) |
| 284 | { |
| 285 | NoiseContext *n = ctx->priv; |
| 286 | int ret, i; |
| 287 | |
| 288 | for (i = 0; i < 4; i++) { |
| 289 | if (n->all.seed >= 0) |
| 290 | n->param[i].seed = n->all.seed; |
| 291 | else |
| 292 | n->param[i].seed = 123457; |
| 293 | if (n->all.strength) |
| 294 | n->param[i].strength = n->all.strength; |
| 295 | if (n->all.flags) |
| 296 | n->param[i].flags = n->all.flags; |
| 297 | } |
| 298 | |
| 299 | for (i = 0; i < 4; i++) { |
| 300 | if (n->param[i].strength && ((ret = init_noise(n, i)) < 0)) |
| 301 | return ret; |
| 302 | } |
| 303 | |
| 304 | n->line_noise = ff_line_noise_c; |
| 305 | n->line_noise_avg = ff_line_noise_avg_c; |
| 306 | |
| 307 | if (ARCH_X86) |
| 308 | ff_noise_init_x86(n); |
| 309 | |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | static av_cold void uninit(AVFilterContext *ctx) |
| 314 | { |
| 315 | NoiseContext *n = ctx->priv; |
| 316 | int i; |
| 317 | |
| 318 | for (i = 0; i < 4; i++) |
| 319 | av_freep(&n->param[i].noise); |
| 320 | } |
| 321 | |
| 322 | static const AVFilterPad noise_inputs[] = { |
| 323 | { |
| 324 | .name = "default", |
| 325 | .type = AVMEDIA_TYPE_VIDEO, |
| 326 | .filter_frame = filter_frame, |
| 327 | .config_props = config_input, |
| 328 | }, |
| 329 | { NULL } |
| 330 | }; |
| 331 | |
| 332 | static const AVFilterPad noise_outputs[] = { |
| 333 | { |
| 334 | .name = "default", |
| 335 | .type = AVMEDIA_TYPE_VIDEO, |
| 336 | }, |
| 337 | { NULL } |
| 338 | }; |
| 339 | |
| 340 | AVFilter ff_vf_noise = { |
| 341 | .name = "noise", |
| 342 | .description = NULL_IF_CONFIG_SMALL("Add noise."), |
| 343 | .priv_size = sizeof(NoiseContext), |
| 344 | .init = init, |
| 345 | .uninit = uninit, |
| 346 | .query_formats = query_formats, |
| 347 | .inputs = noise_inputs, |
| 348 | .outputs = noise_outputs, |
| 349 | .priv_class = &noise_class, |
| 350 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, |
| 351 | }; |