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path: root/libavfilter/trim.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 <stdint.h>
20
21#include "config.h"
22
23#include "libavutil/avassert.h"
24#include "libavutil/channel_layout.h"
25#include "libavutil/common.h"
26#include "libavutil/log.h"
27#include "libavutil/mathematics.h"
28#include "libavutil/opt.h"
29#include "libavutil/samplefmt.h"
30
31#include "audio.h"
32#include "avfilter.h"
33#include "internal.h"
34
35typedef struct TrimContext {
36 const AVClass *class;
37
38 /*
39 * AVOptions
40 */
41 int64_t duration;
42 int64_t start_time, end_time;
43 int64_t start_frame, end_frame;
44 /*
45 * in the link timebase for video,
46 * in 1/samplerate for audio
47 */
48 int64_t start_pts, end_pts;
49 int64_t start_sample, end_sample;
50
51 /*
52 * number of video frames that arrived on this filter so far
53 */
54 int64_t nb_frames;
55 /*
56 * number of audio samples that arrived on this filter so far
57 */
58 int64_t nb_samples;
59 /*
60 * timestamp of the first frame in the output, in the timebase units
61 */
62 int64_t first_pts;
63 /*
64 * duration in the timebase units
65 */
66 int64_t duration_tb;
67
68 int64_t next_pts;
69
70 int eof;
71} TrimContext;
72
73static av_cold int init(AVFilterContext *ctx)
74{
75 TrimContext *s = ctx->priv;
76
77 s->first_pts = AV_NOPTS_VALUE;
78
79 return 0;
80}
81
82static int config_input(AVFilterLink *inlink)
83{
84 AVFilterContext *ctx = inlink->dst;
85 TrimContext *s = ctx->priv;
86 AVRational tb = (inlink->type == AVMEDIA_TYPE_VIDEO) ?
87 inlink->time_base : (AVRational){ 1, inlink->sample_rate };
88
89 if (s->start_time != INT64_MAX) {
90 int64_t start_pts = av_rescale_q(s->start_time, AV_TIME_BASE_Q, tb);
91 if (s->start_pts == AV_NOPTS_VALUE || start_pts < s->start_pts)
92 s->start_pts = start_pts;
93 }
94 if (s->end_time != INT64_MAX) {
95 int64_t end_pts = av_rescale_q(s->end_time, AV_TIME_BASE_Q, tb);
96 if (s->end_pts == AV_NOPTS_VALUE || end_pts > s->end_pts)
97 s->end_pts = end_pts;
98 }
99 if (s->duration)
100 s->duration_tb = av_rescale_q(s->duration, AV_TIME_BASE_Q, tb);
101
102 return 0;
103}
104
105#define OFFSET(x) offsetof(TrimContext, x)
106#define COMMON_OPTS \
107 { "start", "Timestamp of the first frame that " \
108 "should be passed", OFFSET(start_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
109 { "starti", "Timestamp of the first frame that " \
110 "should be passed", OFFSET(start_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
111 { "end", "Timestamp of the first frame that " \
112 "should be dropped again", OFFSET(end_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
113 { "endi", "Timestamp of the first frame that " \
114 "should be dropped again", OFFSET(end_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
115 { "start_pts", "Timestamp of the first frame that should be " \
116 " passed", OFFSET(start_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
117 { "end_pts", "Timestamp of the first frame that should be " \
118 "dropped again", OFFSET(end_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
119 { "duration", "Maximum duration of the output", OFFSET(duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS }, \
120 { "durationi", "Maximum duration of the output", OFFSET(duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
121
122
123#if CONFIG_TRIM_FILTER
124static int trim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
125{
126 AVFilterContext *ctx = inlink->dst;
127 TrimContext *s = ctx->priv;
128 int drop;
129
130 /* drop everything if EOF has already been returned */
131 if (s->eof) {
132 av_frame_free(&frame);
133 return 0;
134 }
135
136 if (s->start_frame >= 0 || s->start_pts != AV_NOPTS_VALUE) {
137 drop = 1;
138 if (s->start_frame >= 0 && s->nb_frames >= s->start_frame)
139 drop = 0;
140 if (s->start_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
141 frame->pts >= s->start_pts)
142 drop = 0;
143 if (drop)
144 goto drop;
145 }
146
147 if (s->first_pts == AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE)
148 s->first_pts = frame->pts;
149
150 if (s->end_frame != INT64_MAX || s->end_pts != AV_NOPTS_VALUE || s->duration_tb) {
151 drop = 1;
152
153 if (s->end_frame != INT64_MAX && s->nb_frames < s->end_frame)
154 drop = 0;
155 if (s->end_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
156 frame->pts < s->end_pts)
157 drop = 0;
158 if (s->duration_tb && frame->pts != AV_NOPTS_VALUE &&
159 frame->pts - s->first_pts < s->duration_tb)
160 drop = 0;
161
162 if (drop) {
163 s->eof = 1;
164 ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);
165 goto drop;
166 }
167 }
168
169 s->nb_frames++;
170
171 return ff_filter_frame(ctx->outputs[0], frame);
172
173drop:
174 s->nb_frames++;
175 av_frame_free(&frame);
176 return 0;
177}
178
179#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
180static const AVOption trim_options[] = {
181 COMMON_OPTS
182 { "start_frame", "Number of the first frame that should be passed "
183 "to the output", OFFSET(start_frame), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
184 { "end_frame", "Number of the first frame that should be dropped "
185 "again", OFFSET(end_frame), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
186 { NULL }
187};
188#undef FLAGS
189
190AVFILTER_DEFINE_CLASS(trim);
191
192static const AVFilterPad trim_inputs[] = {
193 {
194 .name = "default",
195 .type = AVMEDIA_TYPE_VIDEO,
196 .filter_frame = trim_filter_frame,
197 .config_props = config_input,
198 },
199 { NULL }
200};
201
202static const AVFilterPad trim_outputs[] = {
203 {
204 .name = "default",
205 .type = AVMEDIA_TYPE_VIDEO,
206 },
207 { NULL }
208};
209
210AVFilter ff_vf_trim = {
211 .name = "trim",
212 .description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),
213 .init = init,
214 .priv_size = sizeof(TrimContext),
215 .priv_class = &trim_class,
216 .inputs = trim_inputs,
217 .outputs = trim_outputs,
218};
219#endif // CONFIG_TRIM_FILTER
220
221#if CONFIG_ATRIM_FILTER
222static int atrim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
223{
224 AVFilterContext *ctx = inlink->dst;
225 TrimContext *s = ctx->priv;
226 int64_t start_sample, end_sample;
227 int64_t pts;
228 int drop;
229
230 /* drop everything if EOF has already been returned */
231 if (s->eof) {
232 av_frame_free(&frame);
233 return 0;
234 }
235
236 if (frame->pts != AV_NOPTS_VALUE)
237 pts = av_rescale_q(frame->pts, inlink->time_base,
238 (AVRational){ 1, inlink->sample_rate });
239 else
240 pts = s->next_pts;
241 s->next_pts = pts + frame->nb_samples;
242
243 /* check if at least a part of the frame is after the start time */
244 if (s->start_sample < 0 && s->start_pts == AV_NOPTS_VALUE) {
245 start_sample = 0;
246 } else {
247 drop = 1;
248 start_sample = frame->nb_samples;
249
250 if (s->start_sample >= 0 &&
251 s->nb_samples + frame->nb_samples > s->start_sample) {
252 drop = 0;
253 start_sample = FFMIN(start_sample, s->start_sample - s->nb_samples);
254 }
255
256 if (s->start_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
257 pts + frame->nb_samples > s->start_pts) {
258 drop = 0;
259 start_sample = FFMIN(start_sample, s->start_pts - pts);
260 }
261
262 if (drop)
263 goto drop;
264 }
265
266 if (s->first_pts == AV_NOPTS_VALUE)
267 s->first_pts = pts + start_sample;
268
269 /* check if at least a part of the frame is before the end time */
270 if (s->end_sample == INT64_MAX && s->end_pts == AV_NOPTS_VALUE && !s->duration_tb) {
271 end_sample = frame->nb_samples;
272 } else {
273 drop = 1;
274 end_sample = 0;
275
276 if (s->end_sample != INT64_MAX &&
277 s->nb_samples < s->end_sample) {
278 drop = 0;
279 end_sample = FFMAX(end_sample, s->end_sample - s->nb_samples);
280 }
281
282 if (s->end_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
283 pts < s->end_pts) {
284 drop = 0;
285 end_sample = FFMAX(end_sample, s->end_pts - pts);
286 }
287
288 if (s->duration_tb && pts - s->first_pts < s->duration_tb) {
289 drop = 0;
290 end_sample = FFMAX(end_sample, s->first_pts + s->duration_tb - pts);
291 }
292
293 if (drop) {
294 s->eof = 1;
295 ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);
296 goto drop;
297 }
298 }
299
300 s->nb_samples += frame->nb_samples;
301 start_sample = FFMAX(0, start_sample);
302 end_sample = FFMIN(frame->nb_samples, end_sample);
303 av_assert0(start_sample < end_sample || (start_sample == end_sample && !frame->nb_samples));
304
305 if (start_sample) {
306 AVFrame *out = ff_get_audio_buffer(ctx->outputs[0], end_sample - start_sample);
307 if (!out) {
308 av_frame_free(&frame);
309 return AVERROR(ENOMEM);
310 }
311
312 av_frame_copy_props(out, frame);
313 av_samples_copy(out->extended_data, frame->extended_data, 0, start_sample,
314 out->nb_samples, inlink->channels,
315 frame->format);
316 if (out->pts != AV_NOPTS_VALUE)
317 out->pts += av_rescale_q(start_sample, (AVRational){ 1, out->sample_rate },
318 inlink->time_base);
319
320 av_frame_free(&frame);
321 frame = out;
322 } else
323 frame->nb_samples = end_sample;
324
325 return ff_filter_frame(ctx->outputs[0], frame);
326
327drop:
328 s->nb_samples += frame->nb_samples;
329 av_frame_free(&frame);
330 return 0;
331}
332
333#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
334static const AVOption atrim_options[] = {
335 COMMON_OPTS
336 { "start_sample", "Number of the first audio sample that should be "
337 "passed to the output", OFFSET(start_sample), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
338 { "end_sample", "Number of the first audio sample that should be "
339 "dropped again", OFFSET(end_sample), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
340 { NULL }
341};
342#undef FLAGS
343
344AVFILTER_DEFINE_CLASS(atrim);
345
346static const AVFilterPad atrim_inputs[] = {
347 {
348 .name = "default",
349 .type = AVMEDIA_TYPE_AUDIO,
350 .filter_frame = atrim_filter_frame,
351 .config_props = config_input,
352 },
353 { NULL }
354};
355
356static const AVFilterPad atrim_outputs[] = {
357 {
358 .name = "default",
359 .type = AVMEDIA_TYPE_AUDIO,
360 },
361 { NULL }
362};
363
364AVFilter ff_af_atrim = {
365 .name = "atrim",
366 .description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),
367 .init = init,
368 .priv_size = sizeof(TrimContext),
369 .priv_class = &atrim_class,
370 .inputs = atrim_inputs,
371 .outputs = atrim_outputs,
372};
373#endif // CONFIG_ATRIM_FILTER
374
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