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;
51 static int query_formats(AVFilterContext *ctx)
53 AVFilterFormats *pix_fmts = NULL;
56 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
57 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
58 if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
59 desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
60 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
61 (ret = ff_add_format(&pix_fmts, fmt)) < 0)
65 return ff_set_common_formats(ctx, pix_fmts);
68 static av_cold int init(AVFilterContext *ctx)
70 MixContext *s = ctx->priv;
71 char *p, *arg, *saveptr = NULL;
74 s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
76 return AVERROR(ENOMEM);
78 s->weights = av_calloc(s->nb_inputs, sizeof(*s->weights));
80 return AVERROR(ENOMEM);
82 for (i = 0; i < s->nb_inputs; i++) {
83 AVFilterPad pad = { 0 };
85 pad.type = AVMEDIA_TYPE_VIDEO;
86 pad.name = av_asprintf("input%d", i);
88 return AVERROR(ENOMEM);
90 if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
97 for (i = 0; i < s->nb_inputs; i++) {
98 if (!(arg = av_strtok(p, " ", &saveptr)))
102 sscanf(arg, "%f", &s->weights[i]);
103 s->wfactor += s->weights[i];
105 s->wfactor = 1 / s->wfactor;
110 static int process_frame(FFFrameSync *fs)
112 AVFilterContext *ctx = fs->parent;
113 AVFilterLink *outlink = ctx->outputs[0];
114 MixContext *s = fs->opaque;
115 AVFrame **in = s->frames;
119 for (i = 0; i < s->nb_inputs; i++) {
120 if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
124 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
126 return AVERROR(ENOMEM);
127 out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
130 for (p = 0; p < s->nb_planes; p++) {
131 uint8_t *dst = out->data[p];
133 for (y = 0; y < s->height[p]; y++) {
134 for (x = 0; x < s->linesize[p]; x++) {
137 for (i = 0; i < s->nb_inputs; i++) {
138 uint8_t src = in[i]->data[p][y * s->linesize[p] + x];
140 val += src * s->weights[i];
143 dst[x] = val * s->wfactor;
146 dst += out->linesize[p];
150 for (p = 0; p < s->nb_planes; p++) {
151 uint16_t *dst = (uint16_t *)out->data[p];
153 for (y = 0; y < s->height[p]; y++) {
154 for (x = 0; x < s->linesize[p]; x++) {
157 for (i = 0; i < s->nb_inputs; i++) {
158 uint16_t src = AV_RN16(in[i]->data[p] + y * s->linesize[p] + x * 2);
160 val += src * s->weights[i];
163 dst[x] = val * s->wfactor;
166 dst += out->linesize[p] / 2;
171 return ff_filter_frame(outlink, out);
174 static int config_output(AVFilterLink *outlink)
176 AVFilterContext *ctx = outlink->src;
177 MixContext *s = ctx->priv;
178 AVRational time_base = ctx->inputs[0]->time_base;
179 AVRational frame_rate = ctx->inputs[0]->frame_rate;
180 AVFilterLink *inlink = ctx->inputs[0];
181 int height = ctx->inputs[0]->h;
182 int width = ctx->inputs[0]->w;
186 for (i = 1; i < s->nb_inputs; i++) {
187 if (ctx->inputs[i]->h != height || ctx->inputs[i]->w != width) {
188 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);
189 return AVERROR(EINVAL);
193 s->desc = av_pix_fmt_desc_get(outlink->format);
196 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
197 s->depth = s->desc->comp[0].depth;
201 outlink->time_base = time_base;
202 outlink->frame_rate = frame_rate;
204 if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
209 s->fs.on_event = process_frame;
211 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
214 s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
215 s->height[0] = s->height[3] = inlink->h;
217 for (i = 0; i < s->nb_inputs; i++) {
218 AVFilterLink *inlink = ctx->inputs[i];
220 in[i].time_base = inlink->time_base;
222 in[i].before = EXT_STOP;
223 in[i].after = (s->duration == 1 || (s->duration == 2 && i == 0)) ? EXT_STOP : EXT_INFINITY;
226 return ff_framesync_configure(&s->fs);
229 static av_cold void uninit(AVFilterContext *ctx)
231 MixContext *s = ctx->priv;
234 ff_framesync_uninit(&s->fs);
235 av_freep(&s->frames);
236 av_freep(&s->weights);
238 for (i = 0; i < ctx->nb_inputs; i++)
239 av_freep(&ctx->input_pads[i].name);
242 static int activate(AVFilterContext *ctx)
244 MixContext *s = ctx->priv;
245 return ff_framesync_activate(&s->fs);
248 #define OFFSET(x) offsetof(MixContext, x)
249 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
251 static const AVOption mix_options[] = {
252 { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
253 { "weights", "set weight for each input", OFFSET(weights_str), AV_OPT_TYPE_STRING, {.str="1 1"}, 0, 0, .flags = FLAGS },
254 { "duration", "how to determine end of stream", OFFSET(duration), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, .flags = FLAGS, "duration" },
255 { "longest", "Duration of longest input", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "duration" },
256 { "shortest", "Duration of shortest input", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "duration" },
257 { "first", "Duration of first input", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "duration" },
261 static const AVFilterPad outputs[] = {
264 .type = AVMEDIA_TYPE_VIDEO,
265 .config_props = config_output,
270 AVFILTER_DEFINE_CLASS(mix);
272 AVFilter ff_vf_mix = {
274 .description = NULL_IF_CONFIG_SMALL("Mix video inputs."),
275 .priv_size = sizeof(MixContext),
276 .priv_class = &mix_class,
277 .query_formats = query_formats,
281 .activate = activate,
282 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,