| /* |
| * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> |
| * Copyright (c) 2013 Paul B Mahol |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * noise generator |
| */ |
| |
| #include "libavutil/opt.h" |
| #include "libavutil/imgutils.h" |
| #include "libavutil/lfg.h" |
| #include "libavutil/parseutils.h" |
| #include "libavutil/pixdesc.h" |
| #include "avfilter.h" |
| #include "formats.h" |
| #include "internal.h" |
| #include "vf_noise.h" |
| #include "video.h" |
| |
| typedef struct ThreadData { |
| AVFrame *in, *out; |
| } ThreadData; |
| |
| #define OFFSET(x) offsetof(NoiseContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| #define NOISE_PARAMS(name, x, param) \ |
| {#name"_seed", "set component #"#x" noise seed", OFFSET(param.seed), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS}, \ |
| {#name"_strength", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \ |
| {#name"s", "set component #"#x" strength", OFFSET(param.strength), AV_OPT_TYPE_INT, {.i64=0}, 0, 100, FLAGS}, \ |
| {#name"_flags", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \ |
| {#name"f", "set component #"#x" flags", OFFSET(param.flags), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, 31, FLAGS, #name"_flags"}, \ |
| {"a", "averaged noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_AVERAGED}, 0, 0, FLAGS, #name"_flags"}, \ |
| {"p", "(semi)regular pattern", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_PATTERN}, 0, 0, FLAGS, #name"_flags"}, \ |
| {"t", "temporal noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_TEMPORAL}, 0, 0, FLAGS, #name"_flags"}, \ |
| {"u", "uniform noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_UNIFORM}, 0, 0, FLAGS, #name"_flags"}, |
| |
| static const AVOption noise_options[] = { |
| NOISE_PARAMS(all, 0, all) |
| NOISE_PARAMS(c0, 0, param[0]) |
| NOISE_PARAMS(c1, 1, param[1]) |
| NOISE_PARAMS(c2, 2, param[2]) |
| NOISE_PARAMS(c3, 3, param[3]) |
| {NULL} |
| }; |
| |
| AVFILTER_DEFINE_CLASS(noise); |
| |
| static const int8_t patt[4] = { -1, 0, 1, 0 }; |
| |
| #define RAND_N(range) ((int) ((double) range * av_lfg_get(lfg) / (UINT_MAX + 1.0))) |
| static av_cold int init_noise(NoiseContext *n, int comp) |
| { |
| int8_t *noise = av_malloc(MAX_NOISE * sizeof(int8_t)); |
| FilterParams *fp = &n->param[comp]; |
| AVLFG *lfg = &n->param[comp].lfg; |
| int strength = fp->strength; |
| int flags = fp->flags; |
| int i, j; |
| |
| if (!noise) |
| return AVERROR(ENOMEM); |
| |
| av_lfg_init(&fp->lfg, fp->seed + comp*31415U); |
| |
| for (i = 0, j = 0; i < MAX_NOISE; i++, j++) { |
| if (flags & NOISE_UNIFORM) { |
| if (flags & NOISE_AVERAGED) { |
| if (flags & NOISE_PATTERN) { |
| noise[i] = (RAND_N(strength) - strength / 2) / 6 |
| + patt[j % 4] * strength * 0.25 / 3; |
| } else { |
| noise[i] = (RAND_N(strength) - strength / 2) / 3; |
| } |
| } else { |
| if (flags & NOISE_PATTERN) { |
| noise[i] = (RAND_N(strength) - strength / 2) / 2 |
| + patt[j % 4] * strength * 0.25; |
| } else { |
| noise[i] = RAND_N(strength) - strength / 2; |
| } |
| } |
| } else { |
| double x1, x2, w, y1; |
| do { |
| x1 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0; |
| x2 = 2.0 * av_lfg_get(lfg) / (float)UINT_MAX - 1.0; |
| w = x1 * x1 + x2 * x2; |
| } while (w >= 1.0); |
| |
| w = sqrt((-2.0 * log(w)) / w); |
| y1 = x1 * w; |
| y1 *= strength / sqrt(3.0); |
| if (flags & NOISE_PATTERN) { |
| y1 /= 2; |
| y1 += patt[j % 4] * strength * 0.35; |
| } |
| y1 = av_clipf(y1, -128, 127); |
| if (flags & NOISE_AVERAGED) |
| y1 /= 3.0; |
| noise[i] = (int)y1; |
| } |
| if (RAND_N(6) == 0) |
| j--; |
| } |
| |
| for (i = 0; i < MAX_RES; i++) |
| for (j = 0; j < 3; j++) |
| fp->prev_shift[i][j] = noise + (av_lfg_get(lfg) & (MAX_SHIFT - 1)); |
| |
| fp->noise = noise; |
| return 0; |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats = NULL; |
| int fmt, ret; |
| |
| for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) { |
| const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); |
| if (desc->flags & AV_PIX_FMT_FLAG_PLANAR && !(desc->comp[0].depth & 7) |
| && (ret = ff_add_format(&formats, fmt)) < 0) |
| return ret; |
| } |
| |
| return ff_set_common_formats(ctx, formats); |
| } |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| NoiseContext *n = inlink->dst->priv; |
| const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| int ret; |
| |
| n->nb_planes = av_pix_fmt_count_planes(inlink->format); |
| |
| if ((ret = av_image_fill_linesizes(n->bytewidth, inlink->format, inlink->w)) < 0) |
| return ret; |
| |
| n->height[1] = n->height[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); |
| n->height[0] = n->height[3] = inlink->h; |
| |
| return 0; |
| } |
| |
| void ff_line_noise_c(uint8_t *dst, const uint8_t *src, const int8_t *noise, |
| int len, int shift) |
| { |
| int i; |
| |
| noise += shift; |
| for (i = 0; i < len; i++) { |
| int v = src[i] + noise[i]; |
| |
| dst[i] = av_clip_uint8(v); |
| } |
| } |
| |
| void ff_line_noise_avg_c(uint8_t *dst, const uint8_t *src, |
| int len, const int8_t * const *shift) |
| { |
| int i; |
| const int8_t *src2 = (const int8_t*)src; |
| |
| for (i = 0; i < len; i++) { |
| const int n = shift[0][i] + shift[1][i] + shift[2][i]; |
| dst[i] = src2[i] + ((n * src2[i]) >> 7); |
| } |
| } |
| |
| static void noise(uint8_t *dst, const uint8_t *src, |
| int dst_linesize, int src_linesize, |
| int width, int start, int end, NoiseContext *n, int comp) |
| { |
| FilterParams *p = &n->param[comp]; |
| int8_t *noise = p->noise; |
| const int flags = p->flags; |
| int y; |
| |
| if (!noise) { |
| if (dst != src) |
| av_image_copy_plane(dst, dst_linesize, src, src_linesize, width, end - start); |
| return; |
| } |
| |
| for (y = start; y < end; y++) { |
| const int ix = y & (MAX_RES - 1); |
| int x; |
| for (x=0; x < width; x+= MAX_RES) { |
| int w = FFMIN(width - x, MAX_RES); |
| int shift = p->rand_shift[ix]; |
| |
| if (flags & NOISE_AVERAGED) { |
| n->line_noise_avg(dst + x, src + x, w, (const int8_t**)p->prev_shift[ix]); |
| p->prev_shift[ix][shift & 3] = noise + shift; |
| } else { |
| n->line_noise(dst + x, src + x, noise, w, shift); |
| } |
| } |
| dst += dst_linesize; |
| src += src_linesize; |
| } |
| } |
| |
| static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) |
| { |
| NoiseContext *s = ctx->priv; |
| ThreadData *td = arg; |
| int plane; |
| |
| for (plane = 0; plane < s->nb_planes; plane++) { |
| const int height = s->height[plane]; |
| const int start = (height * jobnr ) / nb_jobs; |
| const int end = (height * (jobnr+1)) / nb_jobs; |
| noise(td->out->data[plane] + start * td->out->linesize[plane], |
| td->in->data[plane] + start * td->in->linesize[plane], |
| td->out->linesize[plane], td->in->linesize[plane], |
| s->bytewidth[plane], start, end, s, plane); |
| } |
| return 0; |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| NoiseContext *n = ctx->priv; |
| ThreadData td; |
| AVFrame *out; |
| int comp, i; |
| |
| if (av_frame_is_writable(inpicref)) { |
| out = inpicref; |
| } else { |
| out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| if (!out) { |
| av_frame_free(&inpicref); |
| return AVERROR(ENOMEM); |
| } |
| av_frame_copy_props(out, inpicref); |
| } |
| |
| for (comp = 0; comp < 4; comp++) { |
| FilterParams *fp = &n->param[comp]; |
| |
| if ((!fp->rand_shift_init || (fp->flags & NOISE_TEMPORAL)) && fp->strength) { |
| |
| for (i = 0; i < MAX_RES; i++) { |
| fp->rand_shift[i] = av_lfg_get(&fp->lfg) & (MAX_SHIFT - 1); |
| } |
| fp->rand_shift_init = 1; |
| } |
| } |
| |
| td.in = inpicref; td.out = out; |
| ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(n->height[0], ff_filter_get_nb_threads(ctx))); |
| emms_c(); |
| |
| if (inpicref != out) |
| av_frame_free(&inpicref); |
| return ff_filter_frame(outlink, out); |
| } |
| |
| static av_cold int init(AVFilterContext *ctx) |
| { |
| NoiseContext *n = ctx->priv; |
| int ret, i; |
| |
| for (i = 0; i < 4; i++) { |
| if (n->all.seed >= 0) |
| n->param[i].seed = n->all.seed; |
| else |
| n->param[i].seed = 123457; |
| if (n->all.strength) |
| n->param[i].strength = n->all.strength; |
| if (n->all.flags) |
| n->param[i].flags = n->all.flags; |
| } |
| |
| for (i = 0; i < 4; i++) { |
| if (n->param[i].strength && ((ret = init_noise(n, i)) < 0)) |
| return ret; |
| } |
| |
| n->line_noise = ff_line_noise_c; |
| n->line_noise_avg = ff_line_noise_avg_c; |
| |
| if (ARCH_X86) |
| ff_noise_init_x86(n); |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| NoiseContext *n = ctx->priv; |
| int i; |
| |
| for (i = 0; i < 4; i++) |
| av_freep(&n->param[i].noise); |
| } |
| |
| static const AVFilterPad noise_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .filter_frame = filter_frame, |
| .config_props = config_input, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad noise_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_vf_noise = { |
| .name = "noise", |
| .description = NULL_IF_CONFIG_SMALL("Add noise."), |
| .priv_size = sizeof(NoiseContext), |
| .init = init, |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .inputs = noise_inputs, |
| .outputs = noise_outputs, |
| .priv_class = &noise_class, |
| .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, |
| }; |
