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;
44 static int query_formats(AVFilterContext *ctx)
46 AVFilterFormats *pix_fmts = NULL;
49 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
50 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
51 if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
52 desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
53 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
54 (ret = ff_add_format(&pix_fmts, fmt)) < 0)
58 return ff_set_common_formats(ctx, pix_fmts);
61 static av_cold int init(AVFilterContext *ctx)
63 StackContext *s = ctx->priv;
66 if (!strcmp(ctx->filter->name, "vstack"))
69 s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
71 return AVERROR(ENOMEM);
73 for (i = 0; i < s->nb_inputs; i++) {
74 AVFilterPad pad = { 0 };
76 pad.type = AVMEDIA_TYPE_VIDEO;
77 pad.name = av_asprintf("input%d", i);
79 return AVERROR(ENOMEM);
81 if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
90 static int process_frame(FFFrameSync *fs)
92 AVFilterContext *ctx = fs->parent;
93 AVFilterLink *outlink = ctx->outputs[0];
94 StackContext *s = fs->opaque;
95 AVFrame **in = s->frames;
97 int i, p, ret, offset[4] = { 0 };
99 for (i = 0; i < s->nb_inputs; i++) {
100 if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
104 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
106 return AVERROR(ENOMEM);
107 out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
108 out->sample_aspect_ratio = outlink->sample_aspect_ratio;
110 for (i = 0; i < s->nb_inputs; i++) {
111 AVFilterLink *inlink = ctx->inputs[i];
115 if ((ret = av_image_fill_linesizes(linesize, inlink->format, inlink->w)) < 0) {
120 height[1] = height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
121 height[0] = height[3] = inlink->h;
123 for (p = 0; p < s->nb_planes; p++) {
124 if (s->is_vertical) {
125 av_image_copy_plane(out->data[p] + offset[p] * out->linesize[p],
129 linesize[p], height[p]);
130 offset[p] += height[p];
132 av_image_copy_plane(out->data[p] + offset[p],
136 linesize[p], height[p]);
137 offset[p] += linesize[p];
142 return ff_filter_frame(outlink, out);
145 static int config_output(AVFilterLink *outlink)
147 AVFilterContext *ctx = outlink->src;
148 StackContext *s = ctx->priv;
149 AVRational time_base = ctx->inputs[0]->time_base;
150 AVRational frame_rate = ctx->inputs[0]->frame_rate;
151 AVRational sar = ctx->inputs[0]->sample_aspect_ratio;
152 int height = ctx->inputs[0]->h;
153 int width = ctx->inputs[0]->w;
157 if (s->is_vertical) {
158 for (i = 1; i < s->nb_inputs; i++) {
159 if (ctx->inputs[i]->w != width) {
160 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);
161 return AVERROR(EINVAL);
163 height += ctx->inputs[i]->h;
166 for (i = 1; i < s->nb_inputs; i++) {
167 if (ctx->inputs[i]->h != height) {
168 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);
169 return AVERROR(EINVAL);
171 width += ctx->inputs[i]->w;
175 s->desc = av_pix_fmt_desc_get(outlink->format);
178 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
182 outlink->time_base = time_base;
183 outlink->frame_rate = frame_rate;
184 outlink->sample_aspect_ratio = sar;
186 if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
191 s->fs.on_event = process_frame;
193 for (i = 0; i < s->nb_inputs; i++) {
194 AVFilterLink *inlink = ctx->inputs[i];
196 in[i].time_base = inlink->time_base;
198 in[i].before = EXT_STOP;
199 in[i].after = s->shortest ? EXT_STOP : EXT_INFINITY;
202 return ff_framesync_configure(&s->fs);
205 static av_cold void uninit(AVFilterContext *ctx)
207 StackContext *s = ctx->priv;
210 ff_framesync_uninit(&s->fs);
211 av_freep(&s->frames);
213 for (i = 0; i < ctx->nb_inputs; i++)
214 av_freep(&ctx->input_pads[i].name);
217 static int activate(AVFilterContext *ctx)
219 StackContext *s = ctx->priv;
220 return ff_framesync_activate(&s->fs);
223 #define OFFSET(x) offsetof(StackContext, x)
224 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
225 static const AVOption stack_options[] = {
226 { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
227 { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
231 static const AVFilterPad outputs[] = {
234 .type = AVMEDIA_TYPE_VIDEO,
235 .config_props = config_output,
240 #if CONFIG_HSTACK_FILTER
242 #define hstack_options stack_options
243 AVFILTER_DEFINE_CLASS(hstack);
245 AVFilter ff_vf_hstack = {
247 .description = NULL_IF_CONFIG_SMALL("Stack video inputs horizontally."),
248 .priv_size = sizeof(StackContext),
249 .priv_class = &hstack_class,
250 .query_formats = query_formats,
254 .activate = activate,
255 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
258 #endif /* CONFIG_HSTACK_FILTER */
260 #if CONFIG_VSTACK_FILTER
262 #define vstack_options stack_options
263 AVFILTER_DEFINE_CLASS(vstack);
265 AVFilter ff_vf_vstack = {
267 .description = NULL_IF_CONFIG_SMALL("Stack video inputs vertically."),
268 .priv_size = sizeof(StackContext),
269 .priv_class = &vstack_class,
270 .query_formats = query_formats,
274 .activate = activate,
275 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
278 #endif /* CONFIG_VSTACK_FILTER */