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path: root/libavfilter/vf_stack.c (plain)
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1/*
2 * Copyright (c) 2015 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/avstring.h"
22#include "libavutil/imgutils.h"
23#include "libavutil/opt.h"
24#include "libavutil/pixdesc.h"
25
26#include "avfilter.h"
27#include "formats.h"
28#include "internal.h"
29#include "framesync.h"
30#include "video.h"
31
32typedef struct StackContext {
33 const AVClass *class;
34 const AVPixFmtDescriptor *desc;
35 int nb_inputs;
36 int shortest;
37 int is_vertical;
38 int nb_planes;
39
40 AVFrame **frames;
41 FFFrameSync fs;
42} StackContext;
43
44static int query_formats(AVFilterContext *ctx)
45{
46 AVFilterFormats *pix_fmts = NULL;
47 int fmt, ret;
48
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)
55 return ret;
56 }
57
58 return ff_set_common_formats(ctx, pix_fmts);
59}
60
61static int filter_frame(AVFilterLink *inlink, AVFrame *in)
62{
63 StackContext *s = inlink->dst->priv;
64 return ff_framesync_filter_frame(&s->fs, inlink, in);
65}
66
67static av_cold int init(AVFilterContext *ctx)
68{
69 StackContext *s = ctx->priv;
70 int i, ret;
71
72 if (!strcmp(ctx->filter->name, "vstack"))
73 s->is_vertical = 1;
74
75 s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames));
76 if (!s->frames)
77 return AVERROR(ENOMEM);
78
79 for (i = 0; i < s->nb_inputs; i++) {
80 AVFilterPad pad = { 0 };
81
82 pad.type = AVMEDIA_TYPE_VIDEO;
83 pad.name = av_asprintf("input%d", i);
84 if (!pad.name)
85 return AVERROR(ENOMEM);
86 pad.filter_frame = filter_frame;
87
88 if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) {
89 av_freep(&pad.name);
90 return ret;
91 }
92 }
93
94 return 0;
95}
96
97static int process_frame(FFFrameSync *fs)
98{
99 AVFilterContext *ctx = fs->parent;
100 AVFilterLink *outlink = ctx->outputs[0];
101 StackContext *s = fs->opaque;
102 AVFrame **in = s->frames;
103 AVFrame *out;
104 int i, p, ret, offset[4] = { 0 };
105
106 for (i = 0; i < s->nb_inputs; i++) {
107 if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
108 return ret;
109 }
110
111 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
112 if (!out)
113 return AVERROR(ENOMEM);
114 out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
115
116 for (i = 0; i < s->nb_inputs; i++) {
117 AVFilterLink *inlink = ctx->inputs[i];
118 int linesize[4];
119 int height[4];
120
121 if ((ret = av_image_fill_linesizes(linesize, inlink->format, inlink->w)) < 0) {
122 av_frame_free(&out);
123 return ret;
124 }
125
126 height[1] = height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
127 height[0] = height[3] = inlink->h;
128
129 for (p = 0; p < s->nb_planes; p++) {
130 if (s->is_vertical) {
131 av_image_copy_plane(out->data[p] + offset[p] * out->linesize[p],
132 out->linesize[p],
133 in[i]->data[p],
134 in[i]->linesize[p],
135 linesize[p], height[p]);
136 offset[p] += height[p];
137 } else {
138 av_image_copy_plane(out->data[p] + offset[p],
139 out->linesize[p],
140 in[i]->data[p],
141 in[i]->linesize[p],
142 linesize[p], height[p]);
143 offset[p] += linesize[p];
144 }
145 }
146 }
147
148 return ff_filter_frame(outlink, out);
149}
150
151static int config_output(AVFilterLink *outlink)
152{
153 AVFilterContext *ctx = outlink->src;
154 StackContext *s = ctx->priv;
155 AVRational time_base = ctx->inputs[0]->time_base;
156 AVRational frame_rate = ctx->inputs[0]->frame_rate;
157 int height = ctx->inputs[0]->h;
158 int width = ctx->inputs[0]->w;
159 FFFrameSyncIn *in;
160 int i, ret;
161
162 if (s->is_vertical) {
163 for (i = 1; i < s->nb_inputs; i++) {
164 if (ctx->inputs[i]->w != width) {
165 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);
166 return AVERROR(EINVAL);
167 }
168 height += ctx->inputs[i]->h;
169 }
170 } else {
171 for (i = 1; i < s->nb_inputs; i++) {
172 if (ctx->inputs[i]->h != height) {
173 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);
174 return AVERROR(EINVAL);
175 }
176 width += ctx->inputs[i]->w;
177 }
178 }
179
180 s->desc = av_pix_fmt_desc_get(outlink->format);
181 if (!s->desc)
182 return AVERROR_BUG;
183 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
184
185 outlink->w = width;
186 outlink->h = height;
187 outlink->time_base = time_base;
188 outlink->frame_rate = frame_rate;
189
190 if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0)
191 return ret;
192
193 in = s->fs.in;
194 s->fs.opaque = s;
195 s->fs.on_event = process_frame;
196
197 for (i = 0; i < s->nb_inputs; i++) {
198 AVFilterLink *inlink = ctx->inputs[i];
199
200 in[i].time_base = inlink->time_base;
201 in[i].sync = 1;
202 in[i].before = EXT_STOP;
203 in[i].after = s->shortest ? EXT_STOP : EXT_INFINITY;
204 }
205
206 return ff_framesync_configure(&s->fs);
207}
208
209static int request_frame(AVFilterLink *outlink)
210{
211 StackContext *s = outlink->src->priv;
212 return ff_framesync_request_frame(&s->fs, outlink);
213}
214
215static av_cold void uninit(AVFilterContext *ctx)
216{
217 StackContext *s = ctx->priv;
218 int i;
219
220 ff_framesync_uninit(&s->fs);
221 av_freep(&s->frames);
222
223 for (i = 0; i < ctx->nb_inputs; i++)
224 av_freep(&ctx->input_pads[i].name);
225}
226
227#define OFFSET(x) offsetof(StackContext, x)
228#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
229static const AVOption stack_options[] = {
230 { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS },
231 { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS },
232 { NULL },
233};
234
235static const AVFilterPad outputs[] = {
236 {
237 .name = "default",
238 .type = AVMEDIA_TYPE_VIDEO,
239 .config_props = config_output,
240 .request_frame = request_frame,
241 },
242 { NULL }
243};
244
245#if CONFIG_HSTACK_FILTER
246
247#define hstack_options stack_options
248AVFILTER_DEFINE_CLASS(hstack);
249
250AVFilter ff_vf_hstack = {
251 .name = "hstack",
252 .description = NULL_IF_CONFIG_SMALL("Stack video inputs horizontally."),
253 .priv_size = sizeof(StackContext),
254 .priv_class = &hstack_class,
255 .query_formats = query_formats,
256 .outputs = outputs,
257 .init = init,
258 .uninit = uninit,
259 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
260};
261
262#endif /* CONFIG_HSTACK_FILTER */
263
264#if CONFIG_VSTACK_FILTER
265
266#define vstack_options stack_options
267AVFILTER_DEFINE_CLASS(vstack);
268
269AVFilter ff_vf_vstack = {
270 .name = "vstack",
271 .description = NULL_IF_CONFIG_SMALL("Stack video inputs vertically."),
272 .priv_size = sizeof(StackContext),
273 .priv_class = &vstack_class,
274 .query_formats = query_formats,
275 .outputs = outputs,
276 .init = init,
277 .uninit = uninit,
278 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
279};
280
281#endif /* CONFIG_VSTACK_FILTER */
282
generated by cgit at 2024-05-17 03:21:30 (GMT)