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1 | /* |
2 | * Copyright 2007 Bobby Bingham | |
3 | * Copyright 2012 Robert Nagy <ronag89 gmail com> | |
4 | * Copyright 2012 Anton Khirnov <anton khirnov net> | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | /** | |
24 | * @file | |
25 | * a filter enforcing given constant framerate | |
26 | */ | |
27 | ||
28 | #include <float.h> | |
29 | #include <stdint.h> | |
30 | ||
31 | #include "libavutil/common.h" | |
32 | #include "libavutil/fifo.h" | |
33 | #include "libavutil/mathematics.h" | |
34 | #include "libavutil/opt.h" | |
35 | #include "libavutil/parseutils.h" | |
36 | ||
37 | #include "avfilter.h" | |
38 | #include "internal.h" | |
39 | #include "video.h" | |
40 | ||
41 | typedef struct FPSContext { | |
42 | const AVClass *class; | |
43 | ||
44 | AVFifoBuffer *fifo; ///< store frames until we get two successive timestamps | |
45 | ||
46 | /* timestamps in input timebase */ | |
47 | int64_t first_pts; ///< pts of the first frame that arrived on this filter | |
48 | ||
49 | double start_time; ///< pts, in seconds, of the expected first frame | |
50 | ||
51 | AVRational framerate; ///< target framerate | |
52 | int rounding; ///< AVRounding method for timestamps | |
53 | ||
54 | /* statistics */ | |
55 | int frames_in; ///< number of frames on input | |
56 | int frames_out; ///< number of frames on output | |
57 | int dup; ///< number of frames duplicated | |
58 | int drop; ///< number of framed dropped | |
59 | } FPSContext; | |
60 | ||
61 | #define OFFSET(x) offsetof(FPSContext, x) | |
62 | #define V AV_OPT_FLAG_VIDEO_PARAM | |
63 | #define F AV_OPT_FLAG_FILTERING_PARAM | |
64 | static const AVOption fps_options[] = { | |
65 | { "fps", "A string describing desired output framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, { .str = "25" }, .flags = V|F }, | |
66 | { "start_time", "Assume the first PTS should be this value.", OFFSET(start_time), AV_OPT_TYPE_DOUBLE, { .dbl = DBL_MAX}, -DBL_MAX, DBL_MAX, V }, | |
67 | { "round", "set rounding method for timestamps", OFFSET(rounding), AV_OPT_TYPE_INT, { .i64 = AV_ROUND_NEAR_INF }, 0, 5, V|F, "round" }, | |
68 | { "zero", "round towards 0", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_ZERO }, 0, 5, V|F, "round" }, | |
69 | { "inf", "round away from 0", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_INF }, 0, 5, V|F, "round" }, | |
70 | { "down", "round towards -infty", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_DOWN }, 0, 5, V|F, "round" }, | |
71 | { "up", "round towards +infty", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_UP }, 0, 5, V|F, "round" }, | |
72 | { "near", "round to nearest", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_NEAR_INF }, 0, 5, V|F, "round" }, | |
73 | { NULL } | |
74 | }; | |
75 | ||
76 | AVFILTER_DEFINE_CLASS(fps); | |
77 | ||
78 | static av_cold int init(AVFilterContext *ctx) | |
79 | { | |
80 | FPSContext *s = ctx->priv; | |
81 | ||
82 | if (!(s->fifo = av_fifo_alloc_array(2, sizeof(AVFrame*)))) | |
83 | return AVERROR(ENOMEM); | |
84 | ||
85 | s->first_pts = AV_NOPTS_VALUE; | |
86 | ||
87 | av_log(ctx, AV_LOG_VERBOSE, "fps=%d/%d\n", s->framerate.num, s->framerate.den); | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static void flush_fifo(AVFifoBuffer *fifo) | |
92 | { | |
93 | while (av_fifo_size(fifo)) { | |
94 | AVFrame *tmp; | |
95 | av_fifo_generic_read(fifo, &tmp, sizeof(tmp), NULL); | |
96 | av_frame_free(&tmp); | |
97 | } | |
98 | } | |
99 | ||
100 | static av_cold void uninit(AVFilterContext *ctx) | |
101 | { | |
102 | FPSContext *s = ctx->priv; | |
103 | if (s->fifo) { | |
104 | s->drop += av_fifo_size(s->fifo) / sizeof(AVFrame*); | |
105 | flush_fifo(s->fifo); | |
106 | av_fifo_freep(&s->fifo); | |
107 | } | |
108 | ||
109 | av_log(ctx, AV_LOG_VERBOSE, "%d frames in, %d frames out; %d frames dropped, " | |
110 | "%d frames duplicated.\n", s->frames_in, s->frames_out, s->drop, s->dup); | |
111 | } | |
112 | ||
113 | static int config_props(AVFilterLink* link) | |
114 | { | |
115 | FPSContext *s = link->src->priv; | |
116 | ||
117 | link->time_base = av_inv_q(s->framerate); | |
118 | link->frame_rate= s->framerate; | |
119 | link->w = link->src->inputs[0]->w; | |
120 | link->h = link->src->inputs[0]->h; | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int request_frame(AVFilterLink *outlink) | |
126 | { | |
127 | AVFilterContext *ctx = outlink->src; | |
128 | FPSContext *s = ctx->priv; | |
129 | int frames_out = s->frames_out; | |
130 | int ret = 0; | |
131 | ||
132 | while (ret >= 0 && s->frames_out == frames_out) | |
133 | ret = ff_request_frame(ctx->inputs[0]); | |
134 | ||
135 | /* flush the fifo */ | |
136 | if (ret == AVERROR_EOF && av_fifo_size(s->fifo)) { | |
137 | int i; | |
138 | for (i = 0; av_fifo_size(s->fifo); i++) { | |
139 | AVFrame *buf; | |
140 | ||
141 | av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL); | |
142 | buf->pts = av_rescale_q(s->first_pts, ctx->inputs[0]->time_base, | |
143 | outlink->time_base) + s->frames_out; | |
144 | ||
145 | if ((ret = ff_filter_frame(outlink, buf)) < 0) | |
146 | return ret; | |
147 | ||
148 | s->frames_out++; | |
149 | } | |
150 | return 0; | |
151 | } | |
152 | ||
153 | return ret; | |
154 | } | |
155 | ||
156 | static int write_to_fifo(AVFifoBuffer *fifo, AVFrame *buf) | |
157 | { | |
158 | int ret; | |
159 | ||
160 | if (!av_fifo_space(fifo) && | |
161 | (ret = av_fifo_realloc2(fifo, 2*av_fifo_size(fifo)))) { | |
162 | av_frame_free(&buf); | |
163 | return ret; | |
164 | } | |
165 | ||
166 | av_fifo_generic_write(fifo, &buf, sizeof(buf), NULL); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static int filter_frame(AVFilterLink *inlink, AVFrame *buf) | |
171 | { | |
172 | AVFilterContext *ctx = inlink->dst; | |
173 | FPSContext *s = ctx->priv; | |
174 | AVFilterLink *outlink = ctx->outputs[0]; | |
175 | int64_t delta; | |
176 | int i, ret; | |
177 | ||
178 | s->frames_in++; | |
179 | /* discard frames until we get the first timestamp */ | |
180 | if (s->first_pts == AV_NOPTS_VALUE) { | |
181 | if (buf->pts != AV_NOPTS_VALUE) { | |
182 | ret = write_to_fifo(s->fifo, buf); | |
183 | if (ret < 0) | |
184 | return ret; | |
185 | ||
186 | if (s->start_time != DBL_MAX && s->start_time != AV_NOPTS_VALUE) { | |
187 | double first_pts = s->start_time * AV_TIME_BASE; | |
188 | first_pts = FFMIN(FFMAX(first_pts, INT64_MIN), INT64_MAX); | |
189 | s->first_pts = av_rescale_q(first_pts, AV_TIME_BASE_Q, | |
190 | inlink->time_base); | |
191 | av_log(ctx, AV_LOG_VERBOSE, "Set first pts to (in:%"PRId64" out:%"PRId64")\n", | |
192 | s->first_pts, av_rescale_q(first_pts, AV_TIME_BASE_Q, | |
193 | outlink->time_base)); | |
194 | } else { | |
195 | s->first_pts = buf->pts; | |
196 | } | |
197 | } else { | |
198 | av_log(ctx, AV_LOG_WARNING, "Discarding initial frame(s) with no " | |
199 | "timestamp.\n"); | |
200 | av_frame_free(&buf); | |
201 | s->drop++; | |
202 | } | |
203 | return 0; | |
204 | } | |
205 | ||
206 | /* now wait for the next timestamp */ | |
207 | if (buf->pts == AV_NOPTS_VALUE || av_fifo_size(s->fifo) <= 0) { | |
208 | return write_to_fifo(s->fifo, buf); | |
209 | } | |
210 | ||
211 | /* number of output frames */ | |
212 | delta = av_rescale_q_rnd(buf->pts - s->first_pts, inlink->time_base, | |
213 | outlink->time_base, s->rounding) - s->frames_out ; | |
214 | ||
215 | if (delta < 1) { | |
216 | /* drop the frame and everything buffered except the first */ | |
217 | AVFrame *tmp; | |
218 | int drop = av_fifo_size(s->fifo)/sizeof(AVFrame*); | |
219 | ||
220 | av_log(ctx, AV_LOG_DEBUG, "Dropping %d frame(s).\n", drop); | |
221 | s->drop += drop; | |
222 | ||
223 | av_fifo_generic_read(s->fifo, &tmp, sizeof(tmp), NULL); | |
224 | flush_fifo(s->fifo); | |
225 | ret = write_to_fifo(s->fifo, tmp); | |
226 | ||
227 | av_frame_free(&buf); | |
228 | return ret; | |
229 | } | |
230 | ||
231 | /* can output >= 1 frames */ | |
232 | for (i = 0; i < delta; i++) { | |
233 | AVFrame *buf_out; | |
234 | av_fifo_generic_read(s->fifo, &buf_out, sizeof(buf_out), NULL); | |
235 | ||
236 | /* duplicate the frame if needed */ | |
237 | if (!av_fifo_size(s->fifo) && i < delta - 1) { | |
238 | AVFrame *dup = av_frame_clone(buf_out); | |
239 | ||
240 | av_log(ctx, AV_LOG_DEBUG, "Duplicating frame.\n"); | |
241 | if (dup) | |
242 | ret = write_to_fifo(s->fifo, dup); | |
243 | else | |
244 | ret = AVERROR(ENOMEM); | |
245 | ||
246 | if (ret < 0) { | |
247 | av_frame_free(&buf_out); | |
248 | av_frame_free(&buf); | |
249 | return ret; | |
250 | } | |
251 | ||
252 | s->dup++; | |
253 | } | |
254 | ||
255 | buf_out->pts = av_rescale_q(s->first_pts, inlink->time_base, | |
256 | outlink->time_base) + s->frames_out; | |
257 | ||
258 | if ((ret = ff_filter_frame(outlink, buf_out)) < 0) { | |
259 | av_frame_free(&buf); | |
260 | return ret; | |
261 | } | |
262 | ||
263 | s->frames_out++; | |
264 | } | |
265 | flush_fifo(s->fifo); | |
266 | ||
267 | ret = write_to_fifo(s->fifo, buf); | |
268 | ||
269 | return ret; | |
270 | } | |
271 | ||
272 | static const AVFilterPad avfilter_vf_fps_inputs[] = { | |
273 | { | |
274 | .name = "default", | |
275 | .type = AVMEDIA_TYPE_VIDEO, | |
276 | .filter_frame = filter_frame, | |
277 | }, | |
278 | { NULL } | |
279 | }; | |
280 | ||
281 | static const AVFilterPad avfilter_vf_fps_outputs[] = { | |
282 | { | |
283 | .name = "default", | |
284 | .type = AVMEDIA_TYPE_VIDEO, | |
285 | .request_frame = request_frame, | |
286 | .config_props = config_props | |
287 | }, | |
288 | { NULL } | |
289 | }; | |
290 | ||
291 | AVFilter ff_vf_fps = { | |
292 | .name = "fps", | |
293 | .description = NULL_IF_CONFIG_SMALL("Force constant framerate."), | |
294 | .init = init, | |
295 | .uninit = uninit, | |
296 | .priv_size = sizeof(FPSContext), | |
297 | .priv_class = &fps_class, | |
298 | .inputs = avfilter_vf_fps_inputs, | |
299 | .outputs = avfilter_vf_fps_outputs, | |
300 | }; |