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path: root/libavfilter/f_streamselect.c (plain)
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1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "libavutil/avstring.h"
20#include "libavutil/internal.h"
21#include "libavutil/opt.h"
22#include "avfilter.h"
23#include "audio.h"
24#include "formats.h"
25#include "framesync.h"
26#include "internal.h"
27#include "video.h"
28
29typedef struct StreamSelectContext {
30 const AVClass *class;
31 int nb_inputs;
32 char *map_str;
33 int *map;
34 int nb_map;
35 int is_audio;
36 int64_t *last_pts;
37 AVFrame **frames;
38 FFFrameSync fs;
39} StreamSelectContext;
40
41#define OFFSET(x) offsetof(StreamSelectContext, x)
42#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
43static const AVOption streamselect_options[] = {
44 { "inputs", "number of input streams", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags=FLAGS },
45 { "map", "input indexes to remap to outputs", OFFSET(map_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags=FLAGS },
46 { NULL }
47};
48
49AVFILTER_DEFINE_CLASS(streamselect);
50
51static int filter_frame(AVFilterLink *inlink, AVFrame *in)
52{
53 StreamSelectContext *s = inlink->dst->priv;
54 return ff_framesync_filter_frame(&s->fs, inlink, in);
55}
56
57static int process_frame(FFFrameSync *fs)
58{
59 AVFilterContext *ctx = fs->parent;
60 StreamSelectContext *s = fs->opaque;
61 AVFrame **in = s->frames;
62 int i, j, ret = 0;
63
64 for (i = 0; i < ctx->nb_inputs; i++) {
65 if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
66 return ret;
67 }
68
69 for (j = 0; j < ctx->nb_inputs; j++) {
70 for (i = 0; i < s->nb_map; i++) {
71 if (s->map[i] == j) {
72 AVFrame *out;
73
74 if (s->is_audio && s->last_pts[j] == in[j]->pts &&
75 ctx->outputs[i]->frame_count_in > 0)
76 continue;
77 out = av_frame_clone(in[j]);
78 if (!out)
79 return AVERROR(ENOMEM);
80
81 out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, ctx->outputs[i]->time_base);
82 s->last_pts[j] = in[j]->pts;
83 ret = ff_filter_frame(ctx->outputs[i], out);
84 if (ret < 0)
85 return ret;
86 }
87 }
88 }
89
90 return ret;
91}
92
93static int request_frame(AVFilterLink *outlink)
94{
95 StreamSelectContext *s = outlink->src->priv;
96 return ff_framesync_request_frame(&s->fs, outlink);
97}
98
99static int config_output(AVFilterLink *outlink)
100{
101 AVFilterContext *ctx = outlink->src;
102 StreamSelectContext *s = ctx->priv;
103 const int outlink_idx = FF_OUTLINK_IDX(outlink);
104 const int inlink_idx = s->map[outlink_idx];
105 AVFilterLink *inlink = ctx->inputs[inlink_idx];
106 FFFrameSyncIn *in;
107 int i, ret;
108
109 av_log(ctx, AV_LOG_VERBOSE, "config output link %d "
110 "with settings from input link %d\n",
111 outlink_idx, inlink_idx);
112
113 switch (outlink->type) {
114 case AVMEDIA_TYPE_VIDEO:
115 outlink->w = inlink->w;
116 outlink->h = inlink->h;
117 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
118 outlink->frame_rate = inlink->frame_rate;
119 break;
120 case AVMEDIA_TYPE_AUDIO:
121 outlink->sample_rate = inlink->sample_rate;
122 outlink->channels = inlink->channels;
123 outlink->channel_layout = inlink->channel_layout;
124 break;
125 }
126
127 outlink->time_base = inlink->time_base;
128 outlink->format = inlink->format;
129
130 if (s->fs.opaque == s)
131 return 0;
132
133 if ((ret = ff_framesync_init(&s->fs, ctx, ctx->nb_inputs)) < 0)
134 return ret;
135
136 in = s->fs.in;
137 s->fs.opaque = s;
138 s->fs.on_event = process_frame;
139
140 for (i = 0; i < ctx->nb_inputs; i++) {
141 in[i].time_base = ctx->inputs[i]->time_base;
142 in[i].sync = 1;
143 in[i].before = EXT_STOP;
144 in[i].after = EXT_STOP;
145 }
146
147 s->frames = av_calloc(ctx->nb_inputs, sizeof(*s->frames));
148 if (!s->frames)
149 return AVERROR(ENOMEM);
150
151 return ff_framesync_configure(&s->fs);
152}
153
154static int parse_definition(AVFilterContext *ctx, int nb_pads, void *filter_frame, int is_audio)
155{
156 const int is_input = !!filter_frame;
157 const char *padtype = is_input ? "in" : "out";
158 int i = 0, ret = 0;
159
160 for (i = 0; i < nb_pads; i++) {
161 AVFilterPad pad = { 0 };
162
163 pad.type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
164
165 pad.name = av_asprintf("%sput%d", padtype, i);
166 if (!pad.name)
167 return AVERROR(ENOMEM);
168
169 av_log(ctx, AV_LOG_DEBUG, "Add %s pad %s\n", padtype, pad.name);
170
171 if (is_input) {
172 pad.filter_frame = filter_frame;
173 ret = ff_insert_inpad(ctx, i, &pad);
174 } else {
175 pad.config_props = config_output;
176 pad.request_frame = request_frame;
177 ret = ff_insert_outpad(ctx, i, &pad);
178 }
179
180 if (ret < 0) {
181 av_freep(&pad.name);
182 return ret;
183 }
184 }
185
186 return 0;
187}
188
189static int parse_mapping(AVFilterContext *ctx, const char *map)
190{
191 StreamSelectContext *s = ctx->priv;
192 int *new_map;
193 int new_nb_map = 0;
194
195 if (!map) {
196 av_log(ctx, AV_LOG_ERROR, "mapping definition is not set\n");
197 return AVERROR(EINVAL);
198 }
199
200 new_map = av_calloc(s->nb_inputs, sizeof(*new_map));
201 if (!new_map)
202 return AVERROR(ENOMEM);
203
204 while (1) {
205 char *p;
206 const int n = strtol(map, &p, 0);
207
208 av_log(ctx, AV_LOG_DEBUG, "n=%d map=%p p=%p\n", n, map, p);
209
210 if (map == p)
211 break;
212 map = p;
213
214 if (new_nb_map >= s->nb_inputs) {
215 av_log(ctx, AV_LOG_ERROR, "Unable to map more than the %d "
216 "input pads available\n", s->nb_inputs);
217 av_free(new_map);
218 return AVERROR(EINVAL);
219 }
220
221 if (n < 0 || n >= ctx->nb_inputs) {
222 av_log(ctx, AV_LOG_ERROR, "Input stream index %d doesn't exist "
223 "(there is only %d input streams defined)\n",
224 n, s->nb_inputs);
225 av_free(new_map);
226 return AVERROR(EINVAL);
227 }
228
229 av_log(ctx, AV_LOG_VERBOSE, "Map input stream %d to output stream %d\n", n, new_nb_map);
230 new_map[new_nb_map++] = n;
231 }
232
233 if (!new_nb_map) {
234 av_log(ctx, AV_LOG_ERROR, "invalid mapping\n");
235 av_free(new_map);
236 return AVERROR(EINVAL);
237 }
238
239 av_freep(&s->map);
240 s->map = new_map;
241 s->nb_map = new_nb_map;
242
243 av_log(ctx, AV_LOG_VERBOSE, "%d map set\n", s->nb_map);
244
245 return 0;
246}
247
248static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
249 char *res, int res_len, int flags)
250{
251 if (!strcmp(cmd, "map")) {
252 int ret = parse_mapping(ctx, args);
253
254 if (ret < 0)
255 return ret;
256 return avfilter_config_links(ctx);
257 }
258 return AVERROR(ENOSYS);
259}
260
261static av_cold int init(AVFilterContext *ctx)
262{
263 StreamSelectContext *s = ctx->priv;
264 int ret, nb_outputs = 0;
265 char *map = s->map_str;
266
267 if (!strcmp(ctx->filter->name, "astreamselect"))
268 s->is_audio = 1;
269
270 for (; map;) {
271 char *p;
272
273 strtol(map, &p, 0);
274 if (map == p)
275 break;
276 nb_outputs++;
277 map = p;
278 }
279
280 s->last_pts = av_calloc(s->nb_inputs, sizeof(*s->last_pts));
281 if (!s->last_pts)
282 return AVERROR(ENOMEM);
283
284 if ((ret = parse_definition(ctx, s->nb_inputs, filter_frame, s->is_audio)) < 0 ||
285 (ret = parse_definition(ctx, nb_outputs, NULL, s->is_audio)) < 0)
286 return ret;
287
288 av_log(ctx, AV_LOG_DEBUG, "Configured with %d inpad and %d outpad\n",
289 ctx->nb_inputs, ctx->nb_outputs);
290
291 return parse_mapping(ctx, s->map_str);
292}
293
294static av_cold void uninit(AVFilterContext *ctx)
295{
296 StreamSelectContext *s = ctx->priv;
297
298 av_freep(&s->last_pts);
299 av_freep(&s->map);
300 av_freep(&s->frames);
301 ff_framesync_uninit(&s->fs);
302}
303
304static int query_formats(AVFilterContext *ctx)
305{
306 AVFilterFormats *formats, *rates = NULL;
307 AVFilterChannelLayouts *layouts = NULL;
308 int ret, i;
309
310 for (i = 0; i < ctx->nb_inputs; i++) {
311 formats = ff_all_formats(ctx->inputs[i]->type);
312 if ((ret = ff_set_common_formats(ctx, formats)) < 0)
313 return ret;
314
315 if (ctx->inputs[i]->type == AVMEDIA_TYPE_AUDIO) {
316 rates = ff_all_samplerates();
317 if ((ret = ff_set_common_samplerates(ctx, rates)) < 0)
318 return ret;
319 layouts = ff_all_channel_counts();
320 if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0)
321 return ret;
322 }
323 }
324
325 return 0;
326}
327
328AVFilter ff_vf_streamselect = {
329 .name = "streamselect",
330 .description = NULL_IF_CONFIG_SMALL("Select video streams"),
331 .init = init,
332 .query_formats = query_formats,
333 .process_command = process_command,
334 .uninit = uninit,
335 .priv_size = sizeof(StreamSelectContext),
336 .priv_class = &streamselect_class,
337 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,
338};
339
340#define astreamselect_options streamselect_options
341AVFILTER_DEFINE_CLASS(astreamselect);
342
343AVFilter ff_af_astreamselect = {
344 .name = "astreamselect",
345 .description = NULL_IF_CONFIG_SMALL("Select audio streams"),
346 .init = init,
347 .query_formats = query_formats,
348 .process_command = process_command,
349 .uninit = uninit,
350 .priv_size = sizeof(StreamSelectContext),
351 .priv_class = &astreamselect_class,
352 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,
353};
354
generated by cgit at 2024-05-17 03:20:20 (GMT)