2 * Copyright (c) 2017 Paul B Mahol
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/avstring.h"
22 #include "libavutil/imgutils.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/pixdesc.h"
30 #include "framesync.h"
33 typedef struct MixContext {
35 const AVPixFmtDescriptor *desc;
56 static int query_formats(AVFilterContext *ctx)
58 AVFilterFormats *pix_fmts = NULL;
61 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
62 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
63 if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
64 desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
65 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
66 (ret = ff_add_format(&pix_fmts, fmt)) < 0)
70 return ff_set_common_formats(ctx, pix_fmts);
73 static av_cold int init(AVFilterContext *ctx)
75 MixContext *s = ctx->priv;
76 char *p, *arg, *saveptr = NULL;
79 s->tmix = !strcmp(ctx->filter->name, "tmix");
81 s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
83 return AVERROR(ENOMEM);
85 s->weights = av_calloc(s->nb_inputs, sizeof(*s->weights));
87 return AVERROR(ENOMEM);
90 for (i = 0; i < s->nb_inputs; i++) {
91 AVFilterPad pad = { 0 };
93 pad.type = AVMEDIA_TYPE_VIDEO;
94 pad.name = av_asprintf("input%d", i);
96 return AVERROR(ENOMEM);
98 if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
106 for (i = 0; i < s->nb_inputs; i++) {
107 if (!(arg = av_strtok(p, " ", &saveptr)))
111 sscanf(arg, "%f", &s->weights[i]);
112 s->wfactor += s->weights[i];
115 s->wfactor = 1 / s->wfactor;
117 s->wfactor = s->scale;
123 static void mix_frames(MixContext *s, AVFrame **in, AVFrame *out)
128 for (p = 0; p < s->nb_planes; p++) {
129 uint8_t *dst = out->data[p];
131 for (y = 0; y < s->height[p]; y++) {
132 for (x = 0; x < s->linesize[p]; x++) {
135 for (i = 0; i < s->nb_inputs; i++) {
136 uint8_t src = in[i]->data[p][y * s->linesize[p] + x];
138 val += src * s->weights[i];
141 dst[x] = av_clip_uint8(val * s->wfactor);
144 dst += out->linesize[p];
148 for (p = 0; p < s->nb_planes; p++) {
149 uint16_t *dst = (uint16_t *)out->data[p];
151 for (y = 0; y < s->height[p]; y++) {
152 for (x = 0; x < s->linesize[p] / 2; x++) {
155 for (i = 0; i < s->nb_inputs; i++) {
156 uint16_t src = AV_RN16(in[i]->data[p] + y * s->linesize[p] + x * 2);
158 val += src * s->weights[i];
161 dst[x] = av_clip(val * s->wfactor, 0, s->max);
164 dst += out->linesize[p] / 2;
170 static int process_frame(FFFrameSync *fs)
172 AVFilterContext *ctx = fs->parent;
173 AVFilterLink *outlink = ctx->outputs[0];
174 MixContext *s = fs->opaque;
175 AVFrame **in = s->frames;
179 for (i = 0; i < s->nb_inputs; i++) {
180 if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
184 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
186 return AVERROR(ENOMEM);
187 out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
189 mix_frames(s, in, out);
191 return ff_filter_frame(outlink, out);
194 static int config_output(AVFilterLink *outlink)
196 AVFilterContext *ctx = outlink->src;
197 MixContext *s = ctx->priv;
198 AVRational time_base = ctx->inputs[0]->time_base;
199 AVRational frame_rate = ctx->inputs[0]->frame_rate;
200 AVFilterLink *inlink = ctx->inputs[0];
201 int height = ctx->inputs[0]->h;
202 int width = ctx->inputs[0]->w;
207 for (i = 1; i < s->nb_inputs; i++) {
208 if (ctx->inputs[i]->h != height || ctx->inputs[i]->w != width) {
209 av_log(ctx, AV_LOG_ERROR, "Input %d size (%dx%d) does not match input %d size (%dx%d).\n", i, ctx->inputs[i]->w, ctx->inputs[i]->h, 0, width, height);
210 return AVERROR(EINVAL);
215 s->desc = av_pix_fmt_desc_get(outlink->format);
218 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
219 s->depth = s->desc->comp[0].depth;
220 s->max = (1 << s->depth) - 1;
222 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
225 s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
226 s->height[0] = s->height[3] = inlink->h;
233 outlink->time_base = time_base;
234 outlink->frame_rate = frame_rate;
236 if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
241 s->fs.on_event = process_frame;
243 for (i = 0; i < s->nb_inputs; i++) {
244 AVFilterLink *inlink = ctx->inputs[i];
246 in[i].time_base = inlink->time_base;
248 in[i].before = EXT_STOP;
249 in[i].after = (s->duration == 1 || (s->duration == 2 && i == 0)) ? EXT_STOP : EXT_INFINITY;
252 return ff_framesync_configure(&s->fs);
255 static av_cold void uninit(AVFilterContext *ctx)
257 MixContext *s = ctx->priv;
260 ff_framesync_uninit(&s->fs);
261 av_freep(&s->weights);
264 for (i = 0; i < ctx->nb_inputs; i++)
265 av_freep(&ctx->input_pads[i].name);
267 for (i = 0; i < s->nb_frames; i++)
268 av_frame_free(&s->frames[i]);
270 av_freep(&s->frames);
273 static int activate(AVFilterContext *ctx)
275 MixContext *s = ctx->priv;
276 return ff_framesync_activate(&s->fs);
279 #define OFFSET(x) offsetof(MixContext, x)
280 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
282 static const AVOption mix_options[] = {
283 { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
284 { "weights", "set weight for each input", OFFSET(weights_str), AV_OPT_TYPE_STRING, {.str="1 1"}, 0, 0, .flags = FLAGS },
285 { "scale", "set scale", OFFSET(scale), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, INT16_MAX, .flags = FLAGS },
286 { "duration", "how to determine end of stream", OFFSET(duration), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, .flags = FLAGS, "duration" },
287 { "longest", "Duration of longest input", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "duration" },
288 { "shortest", "Duration of shortest input", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "duration" },
289 { "first", "Duration of first input", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "duration" },
293 static const AVFilterPad outputs[] = {
296 .type = AVMEDIA_TYPE_VIDEO,
297 .config_props = config_output,
302 #if CONFIG_MIX_FILTER
303 AVFILTER_DEFINE_CLASS(mix);
305 AVFilter ff_vf_mix = {
307 .description = NULL_IF_CONFIG_SMALL("Mix video inputs."),
308 .priv_size = sizeof(MixContext),
309 .priv_class = &mix_class,
310 .query_formats = query_formats,
314 .activate = activate,
315 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
318 #endif /* CONFIG_MIX_FILTER */
320 #if CONFIG_TMIX_FILTER
321 static int tmix_filter_frame(AVFilterLink *inlink, AVFrame *in)
323 AVFilterContext *ctx = inlink->dst;
324 AVFilterLink *outlink = ctx->outputs[0];
325 MixContext *s = ctx->priv;
328 if (s->nb_frames < s->nb_inputs) {
329 s->frames[s->nb_frames] = in;
333 av_frame_free(&s->frames[0]);
334 memmove(&s->frames[0], &s->frames[1], sizeof(*s->frames) * (s->nb_inputs - 1));
335 s->frames[s->nb_inputs - 1] = in;
338 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
340 return AVERROR(ENOMEM);
341 out->pts = s->frames[0]->pts;
343 mix_frames(s, s->frames, out);
345 return ff_filter_frame(outlink, out);
348 static const AVOption tmix_options[] = {
349 { "frames", "set number of successive frames to mix", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=3}, 2, 128, .flags = FLAGS },
350 { "weights", "set weight for each frame", OFFSET(weights_str), AV_OPT_TYPE_STRING, {.str="1 1 1"}, 0, 0, .flags = FLAGS },
351 { "scale", "set scale", OFFSET(scale), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, INT16_MAX, .flags = FLAGS },
355 static const AVFilterPad inputs[] = {
358 .type = AVMEDIA_TYPE_VIDEO,
359 .filter_frame = tmix_filter_frame,
364 AVFILTER_DEFINE_CLASS(tmix);
366 AVFilter ff_vf_tmix = {
368 .description = NULL_IF_CONFIG_SMALL("Mix successive video frames."),
369 .priv_size = sizeof(MixContext),
370 .priv_class = &tmix_class,
371 .query_formats = query_formats,
378 #endif /* CONFIG_TMIX_FILTER */