2 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/avassert.h"
25 #include "libavutil/channel_layout.h"
26 #include "libavutil/common.h"
27 #include "libavutil/log.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/samplefmt.h"
36 typedef struct TrimContext {
43 int64_t start_time, end_time;
44 int64_t start_frame, end_frame;
47 double start_time_dbl, end_time_dbl;
49 * in the link timebase for video,
50 * in 1/samplerate for audio
52 int64_t start_pts, end_pts;
53 int64_t start_sample, end_sample;
56 * number of video frames that arrived on this filter so far
60 * number of audio samples that arrived on this filter so far
64 * timestamp of the first frame in the output, in the timebase units
68 * duration in the timebase units
77 static int init(AVFilterContext *ctx)
79 TrimContext *s = ctx->priv;
81 s->first_pts = AV_NOPTS_VALUE;
86 static int config_input(AVFilterLink *inlink)
88 AVFilterContext *ctx = inlink->dst;
89 TrimContext *s = ctx->priv;
90 AVRational tb = (inlink->type == AVMEDIA_TYPE_VIDEO) ?
91 inlink->time_base : (AVRational){ 1, inlink->sample_rate };
93 if (s->start_time_dbl != DBL_MAX)
94 s->start_time = s->start_time_dbl * 1e6;
95 if (s->end_time_dbl != DBL_MAX)
96 s->end_time = s->end_time_dbl * 1e6;
97 if (s->duration_dbl != 0)
98 s->duration = s->duration_dbl * 1e6;
100 if (s->start_time != INT64_MAX) {
101 int64_t start_pts = av_rescale_q(s->start_time, AV_TIME_BASE_Q, tb);
102 if (s->start_pts == AV_NOPTS_VALUE || start_pts < s->start_pts)
103 s->start_pts = start_pts;
105 if (s->end_time != INT64_MAX) {
106 int64_t end_pts = av_rescale_q(s->end_time, AV_TIME_BASE_Q, tb);
107 if (s->end_pts == AV_NOPTS_VALUE || end_pts > s->end_pts)
108 s->end_pts = end_pts;
111 s->duration_tb = av_rescale_q(s->duration, AV_TIME_BASE_Q, tb);
116 static int config_output(AVFilterLink *outlink)
118 outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
122 #define OFFSET(x) offsetof(TrimContext, x)
123 #define COMMON_OPTS \
124 { "starti", "Timestamp of the first frame that " \
125 "should be passed", OFFSET(start_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
126 { "endi", "Timestamp of the first frame that " \
127 "should be dropped again", OFFSET(end_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
128 { "start_pts", "Timestamp of the first frame that should be " \
129 " passed", OFFSET(start_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
130 { "end_pts", "Timestamp of the first frame that should be " \
131 "dropped again", OFFSET(end_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
132 { "durationi", "Maximum duration of the output", OFFSET(duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
134 #define COMPAT_OPTS \
135 { "start", "Timestamp in seconds of the first frame that " \
136 "should be passed", OFFSET(start_time_dbl),AV_OPT_TYPE_DOUBLE, { .dbl = DBL_MAX }, -DBL_MAX, DBL_MAX, FLAGS }, \
137 { "end", "Timestamp in seconds of the first frame that " \
138 "should be dropped again", OFFSET(end_time_dbl), AV_OPT_TYPE_DOUBLE, { .dbl = DBL_MAX }, -DBL_MAX, DBL_MAX, FLAGS }, \
139 { "duration", "Maximum duration of the output in seconds", OFFSET(duration_dbl), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, DBL_MAX, FLAGS },
142 #if CONFIG_TRIM_FILTER
143 static int trim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
145 AVFilterContext *ctx = inlink->dst;
146 TrimContext *s = ctx->priv;
149 /* drop everything if EOF has already been returned */
151 av_frame_free(&frame);
155 if (s->start_frame >= 0 || s->start_pts != AV_NOPTS_VALUE) {
157 if (s->start_frame >= 0 && s->nb_frames >= s->start_frame)
159 if (s->start_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
160 frame->pts >= s->start_pts)
166 if (s->first_pts == AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE)
167 s->first_pts = frame->pts;
169 if (s->end_frame != INT64_MAX || s->end_pts != AV_NOPTS_VALUE || s->duration_tb) {
172 if (s->end_frame != INT64_MAX && s->nb_frames < s->end_frame)
174 if (s->end_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
175 frame->pts < s->end_pts)
177 if (s->duration_tb && frame->pts != AV_NOPTS_VALUE &&
178 frame->pts - s->first_pts < s->duration_tb)
182 s->eof = inlink->closed = 1;
189 return ff_filter_frame(ctx->outputs[0], frame);
193 av_frame_free(&frame);
197 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
198 static const AVOption trim_options[] = {
200 { "start_frame", "Number of the first frame that should be passed "
201 "to the output", OFFSET(start_frame), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
202 { "end_frame", "Number of the first frame that should be dropped "
203 "again", OFFSET(end_frame), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
209 AVFILTER_DEFINE_CLASS(trim);
211 static const AVFilterPad trim_inputs[] = {
214 .type = AVMEDIA_TYPE_VIDEO,
215 .filter_frame = trim_filter_frame,
216 .config_props = config_input,
221 static const AVFilterPad trim_outputs[] = {
224 .type = AVMEDIA_TYPE_VIDEO,
225 .config_props = config_output,
230 AVFilter avfilter_vf_trim = {
232 .description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),
236 .priv_size = sizeof(TrimContext),
237 .priv_class = &trim_class,
239 .inputs = trim_inputs,
240 .outputs = trim_outputs,
242 #endif // CONFIG_TRIM_FILTER
244 #if CONFIG_ATRIM_FILTER
245 static int atrim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
247 AVFilterContext *ctx = inlink->dst;
248 TrimContext *s = ctx->priv;
249 int64_t start_sample, end_sample = frame->nb_samples;
253 /* drop everything if EOF has already been returned */
255 av_frame_free(&frame);
259 if (frame->pts != AV_NOPTS_VALUE)
260 pts = av_rescale_q(frame->pts, inlink->time_base,
261 (AVRational){ 1, inlink->sample_rate });
264 s->next_pts = pts + frame->nb_samples;
266 /* check if at least a part of the frame is after the start time */
267 if (s->start_sample < 0 && s->start_pts == AV_NOPTS_VALUE) {
271 start_sample = frame->nb_samples;
273 if (s->start_sample >= 0 &&
274 s->nb_samples + frame->nb_samples > s->start_sample) {
276 start_sample = FFMIN(start_sample, s->start_sample - s->nb_samples);
279 if (s->start_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
280 pts + frame->nb_samples > s->start_pts) {
282 start_sample = FFMIN(start_sample, s->start_pts - pts);
289 if (s->first_pts == AV_NOPTS_VALUE)
290 s->first_pts = pts + start_sample;
292 /* check if at least a part of the frame is before the end time */
293 if (s->end_sample == INT64_MAX && s->end_pts == AV_NOPTS_VALUE && !s->duration_tb) {
294 end_sample = frame->nb_samples;
299 if (s->end_sample != INT64_MAX &&
300 s->nb_samples < s->end_sample) {
302 end_sample = FFMAX(end_sample, s->end_sample - s->nb_samples);
305 if (s->end_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
308 end_sample = FFMAX(end_sample, s->end_pts - pts);
311 if (s->duration_tb && pts - s->first_pts < s->duration_tb) {
313 end_sample = FFMAX(end_sample, s->first_pts + s->duration_tb - pts);
317 s->eof = inlink->closed = 1;
322 s->nb_samples += frame->nb_samples;
323 start_sample = FFMAX(0, start_sample);
324 end_sample = FFMIN(frame->nb_samples, end_sample);
325 av_assert0(start_sample < end_sample || (start_sample == end_sample && !frame->nb_samples));
328 AVFrame *out = ff_get_audio_buffer(ctx->outputs[0], end_sample - start_sample);
330 av_frame_free(&frame);
331 return AVERROR(ENOMEM);
334 av_frame_copy_props(out, frame);
335 av_samples_copy(out->extended_data, frame->extended_data, 0, start_sample,
336 out->nb_samples, inlink->channels,
338 if (out->pts != AV_NOPTS_VALUE)
339 out->pts += av_rescale_q(start_sample, (AVRational){ 1, out->sample_rate },
342 av_frame_free(&frame);
345 frame->nb_samples = end_sample;
347 return ff_filter_frame(ctx->outputs[0], frame);
350 s->nb_samples += frame->nb_samples;
351 av_frame_free(&frame);
355 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
356 static const AVOption atrim_options[] = {
358 { "start_sample", "Number of the first audio sample that should be "
359 "passed to the output", OFFSET(start_sample), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
360 { "end_sample", "Number of the first audio sample that should be "
361 "dropped again", OFFSET(end_sample), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
367 AVFILTER_DEFINE_CLASS(atrim);
369 static const AVFilterPad atrim_inputs[] = {
372 .type = AVMEDIA_TYPE_AUDIO,
373 .filter_frame = atrim_filter_frame,
374 .config_props = config_input,
379 static const AVFilterPad atrim_outputs[] = {
382 .type = AVMEDIA_TYPE_AUDIO,
383 .config_props = config_output,
388 AVFilter avfilter_af_atrim = {
390 .description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),
394 .priv_size = sizeof(TrimContext),
395 .priv_class = &atrim_class,
397 .inputs = atrim_inputs,
398 .outputs = atrim_outputs,
400 #endif // CONFIG_ATRIM_FILTER