1 /*
2 * Copyright (c) 2022 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/imgutils.h"
22 #include "libavutil/pixdesc.h"
23 #include "libavutil/opt.h"
24 #include "avfilter.h"
25 #include "formats.h"
26 #include "internal.h"
27 #include "video.h"
28 #include "framesync.h"
29
30 typedef struct MultiplyContext {
31 const AVClass *class;
32
33 float offset;
34 float scale;
35 int planes;
36
37 int linesize[4];
38 int nb_planes;
39
40 FFFrameSync fs;
41 } MultiplyContext;
42
43 #define OFFSET(x) offsetof(MultiplyContext, x)
44 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
45
46 typedef struct ThreadData {
47 AVFrame *src, *ref, *dst;
48 } ThreadData;
49
50 static const AVOption multiply_options[] = {
51 { "scale", "set scale", OFFSET(scale), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0., 9., FLAGS },
52 { "offset", "set offset", OFFSET(offset), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, -1., 1., FLAGS },
53 { "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=0xF}, 0., 0xF, FLAGS },
54 { NULL }
55 };
56
57 static const enum AVPixelFormat pix_fmts[] = {
58 AV_PIX_FMT_GBRPF32, AV_PIX_FMT_GBRAPF32,
59 AV_PIX_FMT_NONE
60 };
61
config_input(AVFilterLink * inlink)62 static int config_input(AVFilterLink *inlink)
63 {
64 AVFilterContext *ctx = inlink->dst;
65 MultiplyContext *s = ctx->priv;
66 int ret;
67
68 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
69 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
70 return ret;
71
72 return 0;
73 }
74
multiply(const uint8_t * ssrc,const uint8_t * rref,uint8_t * ddst,float scale,float offset,int w)75 static void multiply(const uint8_t *ssrc, const uint8_t *rref, uint8_t *ddst,
76 float scale, float offset, int w)
77 {
78 const float *src = (const float *)ssrc;
79 const float *ref = (const float *)rref;
80 float *dst = (float *)ddst;
81
82 for (int x = 0; x < w; x++) {
83 const float factor = (ref[x] + offset) * scale;
84
85 dst[x] = src[x] * factor;
86 }
87 }
88
multiply_slice(AVFilterContext * ctx,void * arg,int jobnr,int nb_jobs)89 static int multiply_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
90 {
91 MultiplyContext *s = ctx->priv;
92 const float offset = s->offset;
93 const float scale = s->scale;
94 ThreadData *td = arg;
95
96 for (int p = 0; p < s->nb_planes; p++) {
97 const ptrdiff_t src_linesize = td->src->linesize[p];
98 const ptrdiff_t ref_linesize = td->ref->linesize[p];
99 const ptrdiff_t dst_linesize = td->dst->linesize[p];
100 const int w = td->src->width;
101 const int h = td->src->height;
102 const int slice_start = (h * jobnr) / nb_jobs;
103 const int slice_end = (h * (jobnr+1)) / nb_jobs;
104 const uint8_t *src = td->src->data[p] + slice_start * src_linesize;
105 const uint8_t *ref = td->ref->data[p] + slice_start * ref_linesize;
106 uint8_t *dst = td->dst->data[p] + slice_start * dst_linesize;
107
108 if (!((1 << p) & s->planes)) {
109 av_image_copy_plane(dst, dst_linesize, ref, ref_linesize,
110 s->linesize[p], slice_end - slice_start);
111 continue;
112 }
113
114 for (int y = slice_start; y < slice_end; y++) {
115 multiply(src, ref, dst, scale, offset, w);
116
117 dst += dst_linesize;
118 src += src_linesize;
119 ref += ref_linesize;
120 }
121 }
122
123 return 0;
124 }
125
process_frame(FFFrameSync * fs)126 static int process_frame(FFFrameSync *fs)
127 {
128 AVFilterContext *ctx = fs->parent;
129 MultiplyContext *s = fs->opaque;
130 AVFilterLink *outlink = ctx->outputs[0];
131 AVFrame *out, *src, *ref;
132 int ret;
133
134 if ((ret = ff_framesync_get_frame(&s->fs, 0, &src, 0)) < 0 ||
135 (ret = ff_framesync_get_frame(&s->fs, 1, &ref, 0)) < 0)
136 return ret;
137
138 if (ctx->is_disabled) {
139 out = av_frame_clone(src);
140 if (!out)
141 return AVERROR(ENOMEM);
142 } else {
143 ThreadData td;
144
145 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
146 if (!out)
147 return AVERROR(ENOMEM);
148 av_frame_copy_props(out, src);
149
150 td.src = src;
151 td.ref = ref;
152 td.dst = out;
153
154 ff_filter_execute(ctx, multiply_slice, &td, NULL,
155 FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
156 }
157 out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
158
159 return ff_filter_frame(outlink, out);
160 }
161
config_output(AVFilterLink * outlink)162 static int config_output(AVFilterLink *outlink)
163 {
164 AVFilterContext *ctx = outlink->src;
165 MultiplyContext *s = ctx->priv;
166 AVFilterLink *source = ctx->inputs[0];
167 AVFilterLink *ref = ctx->inputs[1];
168 FFFrameSyncIn *in;
169 int ret;
170
171 if (source->w != ref->w || source->h != ref->h) {
172 av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "
173 "(size %dx%d) do not match the corresponding "
174 "second input link %s parameters (%dx%d)\n",
175 ctx->input_pads[0].name, source->w, source->h,
176 ctx->input_pads[1].name, ref->w, ref->h);
177 return AVERROR(EINVAL);
178 }
179
180 outlink->w = source->w;
181 outlink->h = source->h;
182 outlink->sample_aspect_ratio = source->sample_aspect_ratio;
183 outlink->frame_rate = source->frame_rate;
184
185 if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
186 return ret;
187
188 in = s->fs.in;
189 in[0].time_base = source->time_base;
190 in[1].time_base = ref->time_base;
191 in[0].sync = 1;
192 in[0].before = EXT_STOP;
193 in[0].after = EXT_INFINITY;
194 in[1].sync = 1;
195 in[1].before = EXT_STOP;
196 in[1].after = EXT_INFINITY;
197 s->fs.opaque = s;
198 s->fs.on_event = process_frame;
199
200 ret = ff_framesync_configure(&s->fs);
201 outlink->time_base = s->fs.time_base;
202
203 return ret;
204 }
205
activate(AVFilterContext * ctx)206 static int activate(AVFilterContext *ctx)
207 {
208 MultiplyContext *s = ctx->priv;
209 return ff_framesync_activate(&s->fs);
210 }
211
uninit(AVFilterContext * ctx)212 static av_cold void uninit(AVFilterContext *ctx)
213 {
214 MultiplyContext *s = ctx->priv;
215
216 ff_framesync_uninit(&s->fs);
217 }
218
219 static const AVFilterPad multiply_inputs[] = {
220 {
221 .name = "source",
222 .type = AVMEDIA_TYPE_VIDEO,
223 .config_props = config_input,
224 },
225 {
226 .name = "factor",
227 .type = AVMEDIA_TYPE_VIDEO,
228 },
229 };
230
231 static const AVFilterPad multiply_outputs[] = {
232 {
233 .name = "default",
234 .type = AVMEDIA_TYPE_VIDEO,
235 .config_props = config_output,
236 },
237 };
238
239 AVFILTER_DEFINE_CLASS(multiply);
240
241 const AVFilter ff_vf_multiply = {
242 .name = "multiply",
243 .description = NULL_IF_CONFIG_SMALL("Multiply first video stream with second video stream."),
244 .priv_class = &multiply_class,
245 .priv_size = sizeof(MultiplyContext),
246 .uninit = uninit,
247 .activate = activate,
248 FILTER_INPUTS(multiply_inputs),
249 FILTER_OUTPUTS(multiply_outputs),
250 FILTER_PIXFMTS_ARRAY(pix_fmts),
251 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
252 .process_command = ff_filter_process_command,
253 };
254