2 * Copyright (c) 2015 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/opt.h"
24 #include "libavutil/pixdesc.h"
29 #include "framesync.h"
32 typedef struct StackContext {
34 const AVPixFmtDescriptor *desc;
43 static int query_formats(AVFilterContext *ctx)
45 AVFilterFormats *pix_fmts = NULL;
48 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
49 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
50 if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
51 desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
52 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
53 (ret = ff_add_format(&pix_fmts, fmt)) < 0)
57 return ff_set_common_formats(ctx, pix_fmts);
60 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
62 StackContext *s = inlink->dst->priv;
63 return ff_framesync_filter_frame(&s->fs, inlink, in);
66 static av_cold int init(AVFilterContext *ctx)
68 StackContext *s = ctx->priv;
71 if (!strcmp(ctx->filter->name, "vstack"))
74 s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
76 return AVERROR(ENOMEM);
78 for (i = 0; i < s->nb_inputs; i++) {
79 AVFilterPad pad = { 0 };
81 pad.type = AVMEDIA_TYPE_VIDEO;
82 pad.name = av_asprintf("input%d", i);
84 return AVERROR(ENOMEM);
85 pad.filter_frame = filter_frame;
87 if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
96 static int process_frame(FFFrameSync *fs)
98 AVFilterContext *ctx = fs->parent;
99 AVFilterLink *outlink = ctx->outputs[0];
100 StackContext *s = fs->opaque;
101 AVFrame **in = s->frames;
103 int i, p, ret, offset[4] = { 0 };
105 for (i = 0; i < s->nb_inputs; i++) {
106 if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
110 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
112 return AVERROR(ENOMEM);
113 out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
115 for (i = 0; i < s->nb_inputs; i++) {
116 AVFilterLink *inlink = ctx->inputs[i];
120 if ((ret = av_image_fill_linesizes(linesize, inlink->format, inlink->w)) < 0) {
125 height[1] = height[2] = FF_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
126 height[0] = height[3] = inlink->h;
128 for (p = 0; p < s->nb_planes; p++) {
129 if (s->is_vertical) {
130 av_image_copy_plane(out->data[p] + offset[p] * out->linesize[p],
134 linesize[p], height[p]);
135 offset[p] += height[p];
137 av_image_copy_plane(out->data[p] + offset[p],
141 linesize[p], height[p]);
142 offset[p] += linesize[p];
147 return ff_filter_frame(outlink, out);
150 static int config_output(AVFilterLink *outlink)
152 AVFilterContext *ctx = outlink->src;
153 StackContext *s = ctx->priv;
154 AVRational time_base = ctx->inputs[0]->time_base;
155 AVRational frame_rate = ctx->inputs[0]->frame_rate;
156 int height = ctx->inputs[0]->h;
157 int width = ctx->inputs[0]->w;
161 if (s->is_vertical) {
162 for (i = 1; i < s->nb_inputs; i++) {
163 if (ctx->inputs[i]->w != width) {
164 av_log(ctx, AV_LOG_ERROR, "Input %d width %d does not match input %d width %d.\n", i, ctx->inputs[i]->w, 0, width);
165 return AVERROR(EINVAL);
167 height += ctx->inputs[i]->h;
170 for (i = 1; i < s->nb_inputs; i++) {
171 if (ctx->inputs[i]->h != height) {
172 av_log(ctx, AV_LOG_ERROR, "Input %d height %d does not match input %d height %d.\n", i, ctx->inputs[i]->h, 0, height);
173 return AVERROR(EINVAL);
175 width += ctx->inputs[i]->w;
179 s->desc = av_pix_fmt_desc_get(outlink->format);
182 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
186 outlink->time_base = time_base;
187 outlink->frame_rate = frame_rate;
189 if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
194 s->fs.on_event = process_frame;
196 for (i = 0; i < s->nb_inputs; i++) {
197 AVFilterLink *inlink = ctx->inputs[i];
199 in[i].time_base = inlink->time_base;
201 in[i].before = EXT_STOP;
202 in[i].after = EXT_INFINITY;
205 return ff_framesync_configure(&s->fs);
208 static int request_frame(AVFilterLink *outlink)
210 StackContext *s = outlink->src->priv;
211 return ff_framesync_request_frame(&s->fs, outlink);
214 static av_cold void uninit(AVFilterContext *ctx)
216 StackContext *s = ctx->priv;
217 ff_framesync_uninit(&s->fs);
218 av_freep(&s->frames);
221 #define OFFSET(x) offsetof(StackContext, x)
222 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
223 static const AVOption stack_options[] = {
224 { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
228 static const AVFilterPad outputs[] = {
231 .type = AVMEDIA_TYPE_VIDEO,
232 .config_props = config_output,
233 .request_frame = request_frame,
238 #if CONFIG_HSTACK_FILTER
240 #define hstack_options stack_options
241 AVFILTER_DEFINE_CLASS(hstack);
243 AVFilter ff_vf_hstack = {
245 .description = NULL_IF_CONFIG_SMALL("Stack video inputs horizontally."),
246 .priv_size = sizeof(StackContext),
247 .priv_class = &hstack_class,
248 .query_formats = query_formats,
252 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
255 #endif /* CONFIG_HSTACK_FILTER */
257 #if CONFIG_VSTACK_FILTER
259 #define vstack_options stack_options
260 AVFILTER_DEFINE_CLASS(vstack);
262 AVFilter ff_vf_vstack = {
264 .description = NULL_IF_CONFIG_SMALL("Stack video inputs vertically."),
265 .priv_size = sizeof(StackContext),
266 .priv_class = &vstack_class,
267 .query_formats = query_formats,
271 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
274 #endif /* CONFIG_VSTACK_FILTER */