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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 | * Copyright 2018 Calvin Walton <calvin.walton@kepstin.ca> | ||
6 | * | ||
7 | * This file is part of FFmpeg. | ||
8 | * | ||
9 | * FFmpeg is free software; you can redistribute it and/or | ||
10 | * modify it under the terms of the GNU Lesser General Public | ||
11 | * License as published by the Free Software Foundation; either | ||
12 | * version 2.1 of the License, or (at your option) any later version. | ||
13 | * | ||
14 | * FFmpeg is distributed in the hope that it will be useful, | ||
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
17 | * Lesser General Public License for more details. | ||
18 | * | ||
19 | * You should have received a copy of the GNU Lesser General Public | ||
20 | * License along with FFmpeg; if not, write to the Free Software | ||
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
22 | */ | ||
23 | |||
24 | /** | ||
25 | * @file | ||
26 | * a filter enforcing given constant framerate | ||
27 | */ | ||
28 | |||
29 | #include <float.h> | ||
30 | #include <stdint.h> | ||
31 | |||
32 | #include "libavutil/avassert.h" | ||
33 | #include "libavutil/eval.h" | ||
34 | #include "libavutil/mathematics.h" | ||
35 | #include "libavutil/opt.h" | ||
36 | #include "avfilter.h" | ||
37 | #include "ccfifo.h" | ||
38 | #include "filters.h" | ||
39 | #include "internal.h" | ||
40 | #include "video.h" | ||
41 | |||
42 | enum EOFAction { | ||
43 | EOF_ACTION_ROUND, | ||
44 | EOF_ACTION_PASS, | ||
45 | EOF_ACTION_NB | ||
46 | }; | ||
47 | |||
48 | static const char *const var_names[] = { | ||
49 | "source_fps", | ||
50 | "ntsc", | ||
51 | "pal", | ||
52 | "film", | ||
53 | "ntsc_film", | ||
54 | NULL | ||
55 | }; | ||
56 | |||
57 | enum var_name { | ||
58 | VAR_SOURCE_FPS, | ||
59 | VAR_FPS_NTSC, | ||
60 | VAR_FPS_PAL, | ||
61 | VAR_FPS_FILM, | ||
62 | VAR_FPS_NTSC_FILM, | ||
63 | VARS_NB | ||
64 | }; | ||
65 | |||
66 | static const double ntsc_fps = 30000.0 / 1001.0; | ||
67 | static const double pal_fps = 25.0; | ||
68 | static const double film_fps = 24.0; | ||
69 | static const double ntsc_film_fps = 24000.0 / 1001.0; | ||
70 | |||
71 | typedef struct FPSContext { | ||
72 | const AVClass *class; | ||
73 | |||
74 | double start_time; ///< pts, in seconds, of the expected first frame | ||
75 | |||
76 | char *framerate; ///< expression that defines the target framerate | ||
77 | int rounding; ///< AVRounding method for timestamps | ||
78 | int eof_action; ///< action performed for last frame in FIFO | ||
79 | |||
80 | /* Set during outlink configuration */ | ||
81 | int64_t in_pts_off; ///< input frame pts offset for start_time handling | ||
82 | int64_t out_pts_off; ///< output frame pts offset for start_time handling | ||
83 | |||
84 | /* Runtime state */ | ||
85 | int status; ///< buffered input status | ||
86 | int64_t status_pts; ///< buffered input status timestamp | ||
87 | |||
88 | AVFrame *frames[2]; ///< buffered frames | ||
89 | int frames_count; ///< number of buffered frames | ||
90 | CCFifo cc_fifo; ///< closed captions | ||
91 | |||
92 | int64_t next_pts; ///< pts of the next frame to output | ||
93 | |||
94 | /* statistics */ | ||
95 | int cur_frame_out; ///< number of times current frame has been output | ||
96 | int frames_in; ///< number of frames on input | ||
97 | int frames_out; ///< number of frames on output | ||
98 | int dup; ///< number of frames duplicated | ||
99 | int drop; ///< number of framed dropped | ||
100 | } FPSContext; | ||
101 | |||
102 | #define OFFSET(x) offsetof(FPSContext, x) | ||
103 | #define V AV_OPT_FLAG_VIDEO_PARAM | ||
104 | #define F AV_OPT_FLAG_FILTERING_PARAM | ||
105 | static const AVOption fps_options[] = { | ||
106 | { "fps", "A string describing desired output framerate", OFFSET(framerate), AV_OPT_TYPE_STRING, { .str = "25" }, 0, 0, V|F }, | ||
107 | { "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|F }, | ||
108 | { "round", "set rounding method for timestamps", OFFSET(rounding), AV_OPT_TYPE_INT, { .i64 = AV_ROUND_NEAR_INF }, 0, 5, V|F, .unit = "round" }, | ||
109 | { "zero", "round towards 0", 0, AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_ZERO }, 0, 0, V|F, .unit = "round" }, | ||
110 | { "inf", "round away from 0", 0, AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_INF }, 0, 0, V|F, .unit = "round" }, | ||
111 | { "down", "round towards -infty", 0, AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_DOWN }, 0, 0, V|F, .unit = "round" }, | ||
112 | { "up", "round towards +infty", 0, AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_UP }, 0, 0, V|F, .unit = "round" }, | ||
113 | { "near", "round to nearest", 0, AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_NEAR_INF }, 0, 0, V|F, .unit = "round" }, | ||
114 | { "eof_action", "action performed for last frame", OFFSET(eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_ROUND }, 0, EOF_ACTION_NB-1, V|F, .unit = "eof_action" }, | ||
115 | { "round", "round similar to other frames", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ROUND }, 0, 0, V|F, .unit = "eof_action" }, | ||
116 | { "pass", "pass through last frame", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, 0, 0, V|F, .unit = "eof_action" }, | ||
117 | { NULL } | ||
118 | }; | ||
119 | |||
120 | AVFILTER_DEFINE_CLASS(fps); | ||
121 | |||
122 | 28 | static av_cold int init(AVFilterContext *ctx) | |
123 | { | ||
124 | 28 | FPSContext *s = ctx->priv; | |
125 | |||
126 | 28 | s->status_pts = AV_NOPTS_VALUE; | |
127 | 28 | s->next_pts = AV_NOPTS_VALUE; | |
128 | |||
129 | 28 | return 0; | |
130 | } | ||
131 | |||
132 | /* Remove the first frame from the buffer, returning it */ | ||
133 | 485 | static AVFrame *shift_frame(AVFilterContext *ctx, FPSContext *s) | |
134 | { | ||
135 | AVFrame *frame; | ||
136 | |||
137 | /* Must only be called when there are frames in the buffer */ | ||
138 | av_assert1(s->frames_count > 0); | ||
139 | |||
140 | 485 | frame = s->frames[0]; | |
141 | 485 | s->frames[0] = s->frames[1]; | |
142 | 485 | s->frames[1] = NULL; | |
143 | 485 | s->frames_count--; | |
144 | |||
145 | /* Update statistics counters */ | ||
146 | 485 | s->frames_out += s->cur_frame_out; | |
147 |
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485 | if (s->cur_frame_out > 1) { |
148 | 274 | av_log(ctx, AV_LOG_DEBUG, "Duplicated frame with pts %"PRId64" %d times\n", | |
149 | 274 | frame->pts, s->cur_frame_out - 1); | |
150 | 274 | s->dup += s->cur_frame_out - 1; | |
151 |
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211 | } else if (s->cur_frame_out == 0) { |
152 | 82 | av_log(ctx, AV_LOG_DEBUG, "Dropping frame with pts %"PRId64"\n", | |
153 | frame->pts); | ||
154 | 82 | s->drop++; | |
155 | } | ||
156 | 485 | s->cur_frame_out = 0; | |
157 | |||
158 | 485 | return frame; | |
159 | } | ||
160 | |||
161 | 28 | static av_cold void uninit(AVFilterContext *ctx) | |
162 | { | ||
163 | 28 | FPSContext *s = ctx->priv; | |
164 | |||
165 | AVFrame *frame; | ||
166 | |||
167 |
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28 | while (s->frames_count > 0) { |
168 | ✗ | frame = shift_frame(ctx, s); | |
169 | ✗ | av_frame_free(&frame); | |
170 | } | ||
171 | 28 | ff_ccfifo_uninit(&s->cc_fifo); | |
172 | |||
173 | 28 | av_log(ctx, AV_LOG_VERBOSE, "%d frames in, %d frames out; %d frames dropped, " | |
174 | "%d frames duplicated.\n", s->frames_in, s->frames_out, s->drop, s->dup); | ||
175 | 28 | } | |
176 | |||
177 | 14 | static int config_props(AVFilterLink* outlink) | |
178 | { | ||
179 | 14 | AVFilterContext *ctx = outlink->src; | |
180 | 14 | AVFilterLink *inlink = ctx->inputs[0]; | |
181 | 14 | FPSContext *s = ctx->priv; | |
182 | |||
183 | double var_values[VARS_NB], res; | ||
184 | int ret; | ||
185 | |||
186 | 14 | var_values[VAR_SOURCE_FPS] = av_q2d(inlink->frame_rate); | |
187 | 14 | var_values[VAR_FPS_NTSC] = ntsc_fps; | |
188 | 14 | var_values[VAR_FPS_PAL] = pal_fps; | |
189 | 14 | var_values[VAR_FPS_FILM] = film_fps; | |
190 | 14 | var_values[VAR_FPS_NTSC_FILM] = ntsc_film_fps; | |
191 | 14 | ret = av_expr_parse_and_eval(&res, s->framerate, | |
192 | var_names, var_values, | ||
193 | NULL, NULL, NULL, NULL, NULL, 0, ctx); | ||
194 |
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14 | if (ret < 0) |
195 | ✗ | return ret; | |
196 | |||
197 | 14 | outlink->frame_rate = av_d2q(res, INT_MAX); | |
198 | 14 | outlink->time_base = av_inv_q(outlink->frame_rate); | |
199 | |||
200 | /* Calculate the input and output pts offsets for start_time */ | ||
201 |
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14 | if (s->start_time != DBL_MAX && s->start_time != AV_NOPTS_VALUE) { |
202 | 2 | double first_pts = s->start_time * AV_TIME_BASE; | |
203 |
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2 | if (first_pts < INT64_MIN || first_pts > INT64_MAX) { |
204 | ✗ | av_log(ctx, AV_LOG_ERROR, "Start time %f cannot be represented in internal time base\n", | |
205 | s->start_time); | ||
206 | ✗ | return AVERROR(EINVAL); | |
207 | } | ||
208 | 2 | s->in_pts_off = av_rescale_q_rnd(first_pts, AV_TIME_BASE_Q, inlink->time_base, | |
209 | 2 | s->rounding | AV_ROUND_PASS_MINMAX); | |
210 | 2 | s->out_pts_off = av_rescale_q_rnd(first_pts, AV_TIME_BASE_Q, outlink->time_base, | |
211 | 2 | s->rounding | AV_ROUND_PASS_MINMAX); | |
212 | 2 | s->next_pts = s->out_pts_off; | |
213 | 2 | av_log(ctx, AV_LOG_VERBOSE, "Set first pts to (in:%"PRId64" out:%"PRId64") from start time %f\n", | |
214 | s->in_pts_off, s->out_pts_off, s->start_time); | ||
215 | } | ||
216 | |||
217 | 14 | ret = ff_ccfifo_init(&s->cc_fifo, outlink->frame_rate, ctx); | |
218 |
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14 | if (ret < 0) { |
219 | ✗ | av_log(ctx, AV_LOG_ERROR, "Failure to setup CC FIFO queue\n"); | |
220 | ✗ | return ret; | |
221 | } | ||
222 | |||
223 | 14 | av_log(ctx, AV_LOG_VERBOSE, "fps=%d/%d\n", outlink->frame_rate.num, outlink->frame_rate.den); | |
224 | |||
225 | 14 | return 0; | |
226 | } | ||
227 | |||
228 | /* Read a frame from the input and save it in the buffer */ | ||
229 | 485 | static int read_frame(AVFilterContext *ctx, FPSContext *s, AVFilterLink *inlink, AVFilterLink *outlink) | |
230 | { | ||
231 | AVFrame *frame; | ||
232 | int ret; | ||
233 | int64_t in_pts; | ||
234 | |||
235 | /* Must only be called when we have buffer room available */ | ||
236 | av_assert1(s->frames_count < 2); | ||
237 | |||
238 | 485 | ret = ff_inlink_consume_frame(inlink, &frame); | |
239 | /* Caller must have run ff_inlink_check_available_frame first */ | ||
240 | av_assert1(ret); | ||
241 |
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485 | if (ret < 0) |
242 | ✗ | return ret; | |
243 | |||
244 | /* Convert frame pts to output timebase. | ||
245 | * The dance with offsets is required to match the rounding behaviour of the | ||
246 | * previous version of the fps filter when using the start_time option. */ | ||
247 | 485 | in_pts = frame->pts; | |
248 | 485 | frame->pts = s->out_pts_off + av_rescale_q_rnd(in_pts - s->in_pts_off, | |
249 | inlink->time_base, outlink->time_base, | ||
250 | 485 | s->rounding | AV_ROUND_PASS_MINMAX); | |
251 | |||
252 | 485 | av_log(ctx, AV_LOG_DEBUG, "Read frame with in pts %"PRId64", out pts %"PRId64"\n", | |
253 | 485 | in_pts, frame->pts); | |
254 | |||
255 | 485 | ff_ccfifo_extract(&s->cc_fifo, frame); | |
256 | 485 | s->frames[s->frames_count++] = frame; | |
257 | 485 | s->frames_in++; | |
258 | |||
259 | 485 | return 1; | |
260 | } | ||
261 | |||
262 | /* Write a frame to the output */ | ||
263 | 1366 | static int write_frame(AVFilterContext *ctx, FPSContext *s, AVFilterLink *outlink, int *again) | |
264 | { | ||
265 | AVFrame *frame; | ||
266 | |||
267 | av_assert1(s->frames_count == 2 || (s->status && s->frames_count == 1)); | ||
268 | |||
269 | /* We haven't yet determined the pts of the first frame */ | ||
270 |
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1366 | if (s->next_pts == AV_NOPTS_VALUE) { |
271 |
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12 | if (s->frames[0]->pts != AV_NOPTS_VALUE) { |
272 | 12 | s->next_pts = s->frames[0]->pts; | |
273 | 12 | av_log(ctx, AV_LOG_VERBOSE, "Set first pts to %"PRId64"\n", s->next_pts); | |
274 | } else { | ||
275 | ✗ | av_log(ctx, AV_LOG_WARNING, "Discarding initial frame(s) with no " | |
276 | "timestamp.\n"); | ||
277 | ✗ | frame = shift_frame(ctx, s); | |
278 | ✗ | av_frame_free(&frame); | |
279 | ✗ | *again = 1; | |
280 | ✗ | return 0; | |
281 | } | ||
282 | } | ||
283 | |||
284 | /* There are two conditions where we want to drop a frame: | ||
285 | * - If we have two buffered frames and the second frame is acceptable | ||
286 | * as the next output frame, then drop the first buffered frame. | ||
287 | * - If we have status (EOF) set, drop frames when we hit the | ||
288 | * status timestamp. */ | ||
289 |
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1366 | if ((s->frames_count == 2 && s->frames[1]->pts <= s->next_pts) || |
290 |
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895 | (s->status && s->status_pts <= s->next_pts)) { |
291 | |||
292 | 485 | frame = shift_frame(ctx, s); | |
293 | 485 | av_frame_free(&frame); | |
294 | 485 | *again = 1; | |
295 | 485 | return 0; | |
296 | |||
297 | /* Output a copy of the first buffered frame */ | ||
298 | } else { | ||
299 | 881 | frame = av_frame_clone(s->frames[0]); | |
300 |
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881 | if (!frame) |
301 | ✗ | return AVERROR(ENOMEM); | |
302 | // Make sure Closed Captions will not be duplicated | ||
303 | 881 | ff_ccfifo_inject(&s->cc_fifo, frame); | |
304 | 881 | frame->pts = s->next_pts++; | |
305 | 881 | frame->duration = 1; | |
306 | |||
307 | 881 | av_log(ctx, AV_LOG_DEBUG, "Writing frame with pts %"PRId64" to pts %"PRId64"\n", | |
308 | 881 | s->frames[0]->pts, frame->pts); | |
309 | 881 | s->cur_frame_out++; | |
310 | 881 | *again = 1; | |
311 | 881 | return ff_filter_frame(outlink, frame); | |
312 | } | ||
313 | } | ||
314 | |||
315 | /* Convert status_pts to outlink timebase */ | ||
316 | 14 | static void update_eof_pts(AVFilterContext *ctx, FPSContext *s, AVFilterLink *inlink, AVFilterLink *outlink, int64_t status_pts) | |
317 | { | ||
318 |
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14 | int eof_rounding = (s->eof_action == EOF_ACTION_PASS) ? AV_ROUND_UP : s->rounding; |
319 | 14 | s->status_pts = av_rescale_q_rnd(status_pts, inlink->time_base, outlink->time_base, | |
320 | 14 | eof_rounding | AV_ROUND_PASS_MINMAX); | |
321 | |||
322 | 14 | av_log(ctx, AV_LOG_DEBUG, "EOF is at pts %"PRId64"\n", s->status_pts); | |
323 | 14 | } | |
324 | |||
325 | 1881 | static int activate(AVFilterContext *ctx) | |
326 | { | ||
327 | 1881 | FPSContext *s = ctx->priv; | |
328 | 1881 | AVFilterLink *inlink = ctx->inputs[0]; | |
329 | 1881 | AVFilterLink *outlink = ctx->outputs[0]; | |
330 | |||
331 | int ret; | ||
332 | 1881 | int again = 0; | |
333 | int64_t status_pts; | ||
334 | |||
335 |
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1881 | FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
336 | |||
337 | /* No buffered status: normal operation */ | ||
338 |
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1879 | if (!s->status) { |
339 | |||
340 | /* Read available input frames if we have room */ | ||
341 |
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2329 | while (s->frames_count < 2 && ff_inlink_check_available_frame(inlink)) { |
342 | 485 | ret = read_frame(ctx, s, inlink, outlink); | |
343 |
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485 | if (ret < 0) |
344 | ✗ | return ret; | |
345 | } | ||
346 | |||
347 | /* We do not yet have enough frames to produce output */ | ||
348 |
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1844 | if (s->frames_count < 2) { |
349 | /* Check if we've hit EOF (or otherwise that an error status is set) */ | ||
350 | 513 | ret = ff_inlink_acknowledge_status(inlink, &s->status, &status_pts); | |
351 |
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513 | if (ret > 0) |
352 | 14 | update_eof_pts(ctx, s, inlink, outlink, status_pts); | |
353 | |||
354 |
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513 | if (!ret) { |
355 | /* If someone wants us to output, we'd better ask for more input */ | ||
356 |
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499 | FF_FILTER_FORWARD_WANTED(outlink, inlink); |
357 | 3 | return 0; | |
358 | } | ||
359 | } | ||
360 | } | ||
361 | |||
362 | /* Buffered frames are available, so generate an output frame */ | ||
363 |
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1380 | if (s->frames_count > 0) { |
364 | 1366 | ret = write_frame(ctx, s, outlink, &again); | |
365 | /* Couldn't generate a frame, so schedule us to perform another step */ | ||
366 |
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1366 | if (again && ff_inoutlink_check_flow(inlink, outlink)) |
367 | 506 | ff_filter_set_ready(ctx, 100); | |
368 | 1366 | return ret; | |
369 | } | ||
370 | |||
371 | /* No frames left, so forward the status */ | ||
372 |
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14 | if (s->status && s->frames_count == 0) { |
373 | 14 | ff_outlink_set_status(outlink, s->status, s->next_pts); | |
374 | 14 | return 0; | |
375 | } | ||
376 | |||
377 | ✗ | return FFERROR_NOT_READY; | |
378 | } | ||
379 | |||
380 | static const AVFilterPad avfilter_vf_fps_outputs[] = { | ||
381 | { | ||
382 | .name = "default", | ||
383 | .type = AVMEDIA_TYPE_VIDEO, | ||
384 | .config_props = config_props, | ||
385 | }, | ||
386 | }; | ||
387 | |||
388 | const AVFilter ff_vf_fps = { | ||
389 | .name = "fps", | ||
390 | .description = NULL_IF_CONFIG_SMALL("Force constant framerate."), | ||
391 | .init = init, | ||
392 | .uninit = uninit, | ||
393 | .priv_size = sizeof(FPSContext), | ||
394 | .priv_class = &fps_class, | ||
395 | .activate = activate, | ||
396 | .flags = AVFILTER_FLAG_METADATA_ONLY, | ||
397 | FILTER_INPUTS(ff_video_default_filterpad), | ||
398 | FILTER_OUTPUTS(avfilter_vf_fps_outputs), | ||
399 | }; | ||
400 |