mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
12 years ago
parent
1e78679768
commit
af882e1819
8 changed files with 423 additions and 9 deletions
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/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> |
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* Copyright (c) 2013 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* noise generator |
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*/ |
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#include "libavutil/opt.h" |
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#include "libavutil/imgutils.h" |
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#include "libavutil/parseutils.h" |
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#include "libavutil/pixdesc.h" |
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#include "avfilter.h" |
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#include "formats.h" |
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#include "internal.h" |
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#include "video.h" |
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#define MAX_NOISE 4096 |
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#define MAX_SHIFT 1024 |
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#define MAX_RES (MAX_NOISE-MAX_SHIFT) |
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#define NOISE_UNIFORM 1 |
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#define NOISE_TEMPORAL 2 |
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#define NOISE_QUALITY 4 |
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#define NOISE_AVERAGED 8 |
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#define NOISE_PATTERN 16 |
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typedef struct { |
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int strength; |
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unsigned flags; |
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int shiftptr; |
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int seed; |
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int8_t *noise; |
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int8_t *prev_shift[MAX_RES][3]; |
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} FilterParams; |
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typedef struct { |
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const AVClass *class; |
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int nb_planes; |
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int linesize[4]; |
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int height[4]; |
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FilterParams all; |
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FilterParams param[4]; |
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int rand_shift[MAX_RES]; |
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int rand_shift_init; |
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} NoiseContext; |
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#define OFFSET(x) offsetof(NoiseContext, x) |
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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#define NOISE_PARAMS(name, x, param) \ |
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{#name"_seed", "set component #"#x" noise seed", OFFSET(param.seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS}, \
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{#name"_strength", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
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{#name"s", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \
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{#name"_flags", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
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{#name"f", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \
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{"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, #name"_flags"}, \
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{"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, #name"_flags"}, \
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{"q", "high quality", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_QUALITY}, 0, 0, FLAGS, #name"_flags"}, \
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{"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, #name"_flags"}, \
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{"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, #name"_flags"}, |
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static const AVOption noise_options[] = { |
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NOISE_PARAMS(all, 0, all) |
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NOISE_PARAMS(c0, 0, param[0]) |
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NOISE_PARAMS(c1, 1, param[1]) |
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NOISE_PARAMS(c2, 2, param[2]) |
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NOISE_PARAMS(c3, 3, param[3]) |
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{NULL} |
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}; |
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AVFILTER_DEFINE_CLASS(noise); |
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static const int8_t patt[4] = { -1, 0, 1, 0 }; |
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#define RAND_N(range) ((int) ((double) range * rand() / (RAND_MAX + 1.0))) |
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static int init_noise(NoiseContext *n, int comp) |
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{ |
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int8_t *noise = av_malloc(MAX_NOISE * sizeof(int8_t)); |
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FilterParams *fp = &n->param[comp]; |
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int strength = fp->strength; |
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int flags = fp->flags; |
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int i, j; |
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if (!noise) |
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return AVERROR(ENOMEM); |
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srand(fp->seed); |
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for (i = 0, j = 0; i < MAX_NOISE; i++, j++) { |
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if (flags & NOISE_UNIFORM) { |
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if (flags & NOISE_AVERAGED) { |
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if (flags & NOISE_PATTERN) { |
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noise[i] = (RAND_N(strength) - strength / 2) / 6 |
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+ patt[j % 4] * strength * 0.25 / 3; |
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} else { |
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noise[i] = (RAND_N(strength) - strength / 2) / 3; |
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} |
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} else { |
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if (flags & NOISE_PATTERN) { |
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noise[i] = (RAND_N(strength) - strength / 2) / 2 |
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+ patt[j % 4] * strength * 0.25; |
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} else { |
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noise[i] = RAND_N(strength) - strength / 2; |
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} |
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} |
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} else { |
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double x1, x2, w, y1; |
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do { |
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x1 = 2.0 * rand() / (float)RAND_MAX - 1.0; |
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x2 = 2.0 * rand() / (float)RAND_MAX - 1.0; |
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w = x1 * x1 + x2 * x2; |
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} while (w >= 1.0); |
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w = sqrt((-2.0 * log(w)) / w); |
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y1 = x1 * w; |
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y1 *= strength / sqrt(3.0); |
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if (flags & NOISE_PATTERN) { |
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y1 /= 2; |
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y1 += patt[j % 4] * strength * 0.35; |
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} |
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y1 = av_clipf(y1, -128, 127); |
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if (flags & NOISE_AVERAGED) |
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y1 /= 3.0; |
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noise[i] = (int)y1; |
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} |
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if (RAND_N(6) == 0) |
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j--; |
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} |
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for (i = 0; i < MAX_RES; i++) |
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for (j = 0; j < 3; j++) |
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fp->prev_shift[i][j] = noise + (rand() & (MAX_SHIFT - 1)); |
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if (!n->rand_shift_init) { |
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for (i = 0; i < MAX_RES; i++) |
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n->rand_shift[i] = rand() & (MAX_SHIFT - 1); |
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n->rand_shift_init = 1; |
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} |
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fp->noise = noise; |
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fp->shiftptr = 0; |
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return 0; |
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} |
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static av_cold int init(AVFilterContext *ctx, const char *args) |
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{ |
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NoiseContext *n = ctx->priv; |
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int ret, i; |
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n->class = &noise_class; |
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av_opt_set_defaults(n); |
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if ((ret = av_set_options_string(n, args, "=", ":")) < 0) |
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return ret; |
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for (i = 0; i < 4; i++) { |
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if (n->all.seed >= 0) |
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n->param[i].seed = n->all.seed; |
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else |
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n->param[i].seed = 123457; |
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if (n->all.strength) |
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n->param[i].strength = n->all.strength; |
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if (n->all.flags) |
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n->param[i].flags = n->all.flags; |
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} |
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for (i = 0; i < 4; i++) { |
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if (n->param[i].strength && ((ret = init_noise(n, i)) < 0)) |
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return ret; |
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} |
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return 0; |
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} |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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AVFilterFormats *formats = NULL; |
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int fmt; |
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for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) { |
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); |
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if (desc->flags & PIX_FMT_PLANAR && !((desc->comp[0].depth_minus1 + 1) & 7)) |
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ff_add_format(&formats, fmt); |
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} |
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ff_set_common_formats(ctx, formats); |
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return 0; |
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} |
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static int config_input(AVFilterLink *inlink) |
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{ |
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NoiseContext *n = inlink->dst->priv; |
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
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int i, ret; |
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for (i = 0; i < desc->nb_components; i++) |
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n->nb_planes = FFMAX(n->nb_planes, desc->comp[i].plane); |
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n->nb_planes++; |
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if ((ret = av_image_fill_linesizes(n->linesize, inlink->format, inlink->w)) < 0) |
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return ret; |
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n->height[1] = n->height[2] = inlink->h >> desc->log2_chroma_h; |
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n->height[0] = n->height[3] = inlink->h; |
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return 0; |
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} |
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static void line_noise(uint8_t *dst, const uint8_t *src, int8_t *noise, |
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int len, int shift) |
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{ |
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int i; |
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noise += shift; |
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for (i = 0; i < len; i++) { |
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int v = src[i] + noise[i]; |
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dst[i] = av_clip_uint8(v); |
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} |
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} |
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static void line_noise_avg(uint8_t *dst, const uint8_t *src, |
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int len, int8_t **shift) |
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{ |
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int i; |
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int8_t *src2 = (int8_t*)src; |
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for (i = 0; i < len; i++) { |
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const int n = shift[0][i] + shift[1][i] + shift[2][i]; |
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dst[i] = src2[i] + ((n * src2[i]) >> 7); |
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} |
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} |
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static void noise(uint8_t *dst, const uint8_t *src, |
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int dst_linesize, int src_linesize, |
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int width, int height, NoiseContext *n, int comp) |
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{ |
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int8_t *noise = n->param[comp].noise; |
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int flags = n->param[comp].flags; |
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int shift, y; |
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if (!noise) { |
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if (dst != src) { |
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for (y = 0; y < height; y++) { |
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memcpy(dst, src, width); |
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dst += dst_linesize; |
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src += src_linesize; |
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} |
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} |
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return; |
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} |
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for (y = 0; y < height; y++) { |
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if (flags & NOISE_TEMPORAL) |
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shift = rand() & (MAX_SHIFT - 1); |
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else |
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shift = n->rand_shift[y]; |
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if (!(flags & NOISE_QUALITY)) |
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shift &= ~7; |
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if (flags & NOISE_AVERAGED) { |
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line_noise_avg(dst, src, width, n->param[comp].prev_shift[y]); |
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n->param[comp].prev_shift[y][n->param[comp].shiftptr] = noise + shift; |
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} else { |
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line_noise(dst, src, noise, width, shift); |
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} |
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dst += dst_linesize; |
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src += src_linesize; |
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} |
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n->param[comp].shiftptr++; |
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if (n->param[comp].shiftptr == 3) |
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n->param[comp].shiftptr = 0; |
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} |
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref) |
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{ |
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NoiseContext *n = inlink->dst->priv; |
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AVFilterLink *outlink = inlink->dst->outputs[0]; |
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AVFilterBufferRef *out; |
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int ret, i; |
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if (inpicref->perms & AV_PERM_WRITE) { |
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out = inpicref; |
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} else { |
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out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); |
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if (!out) { |
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avfilter_unref_bufferp(&inpicref); |
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return AVERROR(ENOMEM); |
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} |
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avfilter_copy_buffer_ref_props(out, inpicref); |
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} |
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for (i = 0; i < n->nb_planes; i++) |
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noise(out->data[i], inpicref->data[i], out->linesize[i], |
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inpicref->linesize[i], n->linesize[i], n->height[i], n, i); |
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ret = ff_filter_frame(outlink, out); |
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if (inpicref != out) |
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avfilter_unref_buffer(inpicref); |
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return ret; |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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NoiseContext *n = ctx->priv; |
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int i; |
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for (i = 0; i < 4; i++) |
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av_freep(&n->param[i].noise); |
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av_opt_free(n); |
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} |
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static const AVFilterPad noise_inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.get_video_buffer = ff_null_get_video_buffer, |
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.filter_frame = filter_frame, |
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.config_props = config_input, |
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.min_perms = AV_PERM_READ, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad noise_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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}, |
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{ NULL } |
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}; |
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AVFilter avfilter_vf_noise = { |
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.name = "noise", |
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.description = NULL_IF_CONFIG_SMALL("Add noise."), |
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.priv_size = sizeof(NoiseContext), |
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.init = init, |
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.uninit = uninit, |
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.query_formats = query_formats, |
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.inputs = noise_inputs, |
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.outputs = noise_outputs, |
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.priv_class = &noise_class, |
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}; |
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