libavfilter/trim.c - manifest_repos/ffmpeg - Git at Google

 /*
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #include <stdint.h>

 #include "config.h"

 #include "libavutil/avassert.h"
 #include "libavutil/channel_layout.h"
 #include "libavutil/common.h"
 #include "libavutil/log.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/opt.h"
 #include "libavutil/samplefmt.h"

 #include "audio.h"
 #include "avfilter.h"
 #include "internal.h"

 typedef struct TrimContext {
     const AVClass *class;

     /*
      * AVOptions
      */
     int64_t duration;
     int64_t start_time, end_time;
     int64_t start_frame, end_frame;
     /*
      * in the link timebase for video,
      * in 1/samplerate for audio
      */
     int64_t start_pts, end_pts;
     int64_t start_sample, end_sample;

     /*
      * number of video frames that arrived on this filter so far
      */
     int64_t nb_frames;
     /*
      * number of audio samples that arrived on this filter so far
      */
     int64_t nb_samples;
     /*
      * timestamp of the first frame in the output, in the timebase units
      */
     int64_t first_pts;
     /*
      * duration in the timebase units
      */
     int64_t duration_tb;

     int64_t next_pts;

     int eof;
 } TrimContext;

 static av_cold int init(AVFilterContext *ctx)
 {
     TrimContext *s = ctx->priv;

     s->first_pts = AV_NOPTS_VALUE;

     return 0;
 }

 static int config_input(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     TrimContext       *s = ctx->priv;
     AVRational tb = (inlink->type == AVMEDIA_TYPE_VIDEO) ?
                      inlink->time_base : (AVRational){ 1, inlink->sample_rate };

     if (s->start_time != INT64_MAX) {
         int64_t start_pts = av_rescale_q(s->start_time, AV_TIME_BASE_Q, tb);
         if (s->start_pts == AV_NOPTS_VALUE || start_pts < s->start_pts)
             s->start_pts = start_pts;
     }
     if (s->end_time != INT64_MAX) {
         int64_t end_pts = av_rescale_q(s->end_time, AV_TIME_BASE_Q, tb);
         if (s->end_pts == AV_NOPTS_VALUE || end_pts > s->end_pts)
             s->end_pts = end_pts;
     }
     if (s->duration)
         s->duration_tb = av_rescale_q(s->duration, AV_TIME_BASE_Q, tb);

     return 0;
 }

 #define OFFSET(x) offsetof(TrimContext, x)
 #define COMMON_OPTS                                                                                                                                                         \
     { "start",       "Timestamp of the first frame that "                                                                                                        \
         "should be passed",                                              OFFSET(start_time),  AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX },    INT64_MIN, INT64_MAX, FLAGS }, \
     { "starti",      "Timestamp of the first frame that "                                                                                                        \
         "should be passed",                                              OFFSET(start_time),  AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX },    INT64_MIN, INT64_MAX, FLAGS }, \
     { "end",         "Timestamp of the first frame that "                                                                                                        \
         "should be dropped again",                                       OFFSET(end_time),    AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX },    INT64_MIN, INT64_MAX, FLAGS }, \
     { "endi",        "Timestamp of the first frame that "                                                                                                        \
         "should be dropped again",                                       OFFSET(end_time),    AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX },    INT64_MIN, INT64_MAX, FLAGS }, \
     { "start_pts",   "Timestamp of the first frame that should be "                                                                                                         \
        " passed",                                                        OFFSET(start_pts),   AV_OPT_TYPE_INT64,  { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
     { "end_pts",     "Timestamp of the first frame that should be "                                                                                                         \
         "dropped again",                                                 OFFSET(end_pts),     AV_OPT_TYPE_INT64,  { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
     { "duration",    "Maximum duration of the output",                   OFFSET(duration),    AV_OPT_TYPE_DURATION, { .i64 = 0 },                    0, INT64_MAX, FLAGS }, \
     { "durationi",   "Maximum duration of the output",                   OFFSET(duration),    AV_OPT_TYPE_DURATION, { .i64 = 0 },                    0, INT64_MAX, FLAGS },


 #if CONFIG_TRIM_FILTER
 static int trim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
 {
     AVFilterContext *ctx = inlink->dst;
     TrimContext       *s = ctx->priv;
     int drop;

     /* drop everything if EOF has already been returned */
     if (s->eof) {
         av_frame_free(&frame);
         return 0;
     }

     if (s->start_frame >= 0 || s->start_pts != AV_NOPTS_VALUE) {
         drop = 1;
         if (s->start_frame >= 0 && s->nb_frames >= s->start_frame)
             drop = 0;
         if (s->start_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
             frame->pts >= s->start_pts)
             drop = 0;
         if (drop)
             goto drop;
     }

     if (s->first_pts == AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE)
         s->first_pts = frame->pts;

     if (s->end_frame != INT64_MAX || s->end_pts != AV_NOPTS_VALUE || s->duration_tb) {
         drop = 1;

         if (s->end_frame != INT64_MAX && s->nb_frames < s->end_frame)
             drop = 0;
         if (s->end_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
             frame->pts < s->end_pts)
             drop = 0;
         if (s->duration_tb && frame->pts != AV_NOPTS_VALUE &&
             frame->pts - s->first_pts < s->duration_tb)
             drop = 0;

         if (drop) {
             s->eof = 1;
             ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);
             goto drop;
         }
     }

     s->nb_frames++;

     return ff_filter_frame(ctx->outputs[0], frame);

 drop:
     s->nb_frames++;
     av_frame_free(&frame);
     return 0;
 }

 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
 static const AVOption trim_options[] = {
     COMMON_OPTS
     { "start_frame", "Number of the first frame that should be passed "
         "to the output",                                                 OFFSET(start_frame), AV_OPT_TYPE_INT64,  { .i64 = -1 },       -1, INT64_MAX, FLAGS },
     { "end_frame",   "Number of the first frame that should be dropped "
         "again",                                                         OFFSET(end_frame),   AV_OPT_TYPE_INT64,  { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
     { NULL }
 };
 #undef FLAGS

 AVFILTER_DEFINE_CLASS(trim);

 static const AVFilterPad trim_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = trim_filter_frame,
         .config_props = config_input,
     },
     { NULL }
 };

 static const AVFilterPad trim_outputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
     },
     { NULL }
 };

 AVFilter ff_vf_trim = {
     .name        = "trim",
     .description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),
     .init        = init,
     .priv_size   = sizeof(TrimContext),
     .priv_class  = &trim_class,
     .inputs      = trim_inputs,
     .outputs     = trim_outputs,
 };
 #endif // CONFIG_TRIM_FILTER

 #if CONFIG_ATRIM_FILTER
 static int atrim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
 {
     AVFilterContext *ctx = inlink->dst;
     TrimContext       *s = ctx->priv;
     int64_t start_sample, end_sample;
     int64_t pts;
     int drop;

     /* drop everything if EOF has already been returned */
     if (s->eof) {
         av_frame_free(&frame);
         return 0;
     }

     if (frame->pts != AV_NOPTS_VALUE)
         pts = av_rescale_q(frame->pts, inlink->time_base,
                            (AVRational){ 1, inlink->sample_rate });
     else
         pts = s->next_pts;
     s->next_pts = pts + frame->nb_samples;

     /* check if at least a part of the frame is after the start time */
     if (s->start_sample < 0 && s->start_pts == AV_NOPTS_VALUE) {
         start_sample = 0;
     } else {
         drop = 1;
         start_sample = frame->nb_samples;

         if (s->start_sample >= 0 &&
             s->nb_samples + frame->nb_samples > s->start_sample) {
             drop         = 0;
             start_sample = FFMIN(start_sample, s->start_sample - s->nb_samples);
         }

         if (s->start_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
             pts + frame->nb_samples > s->start_pts) {
             drop = 0;
             start_sample = FFMIN(start_sample, s->start_pts - pts);
         }

         if (drop)
             goto drop;
     }

     if (s->first_pts == AV_NOPTS_VALUE)
         s->first_pts = pts + start_sample;

     /* check if at least a part of the frame is before the end time */
     if (s->end_sample == INT64_MAX && s->end_pts == AV_NOPTS_VALUE && !s->duration_tb) {
         end_sample = frame->nb_samples;
     } else {
         drop       = 1;
         end_sample = 0;

         if (s->end_sample != INT64_MAX &&
             s->nb_samples < s->end_sample) {
             drop       = 0;
             end_sample = FFMAX(end_sample, s->end_sample - s->nb_samples);
         }

         if (s->end_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
             pts < s->end_pts) {
             drop       = 0;
             end_sample = FFMAX(end_sample, s->end_pts - pts);
         }

         if (s->duration_tb && pts - s->first_pts < s->duration_tb) {
             drop       = 0;
             end_sample = FFMAX(end_sample, s->first_pts + s->duration_tb - pts);
         }

         if (drop) {
             s->eof = 1;
             ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);
             goto drop;
         }
     }

     s->nb_samples += frame->nb_samples;
     start_sample   = FFMAX(0, start_sample);
     end_sample     = FFMIN(frame->nb_samples, end_sample);
     if (start_sample >= end_sample || !frame->nb_samples)
         goto drop;

     if (start_sample) {
         AVFrame *out = ff_get_audio_buffer(ctx->outputs[0], end_sample - start_sample);
         if (!out) {
             av_frame_free(&frame);
             return AVERROR(ENOMEM);
         }

         av_frame_copy_props(out, frame);
         av_samples_copy(out->extended_data, frame->extended_data, 0, start_sample,
                         out->nb_samples, inlink->channels,
                         frame->format);
         if (out->pts != AV_NOPTS_VALUE)
             out->pts += av_rescale_q(start_sample, (AVRational){ 1, out->sample_rate },
                                      inlink->time_base);

         av_frame_free(&frame);
         frame = out;
     } else
         frame->nb_samples = end_sample;

     return ff_filter_frame(ctx->outputs[0], frame);

 drop:
     s->nb_samples += frame->nb_samples;
     av_frame_free(&frame);
     return 0;
 }

 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
 static const AVOption atrim_options[] = {
     COMMON_OPTS
     { "start_sample", "Number of the first audio sample that should be "
         "passed to the output",                                          OFFSET(start_sample), AV_OPT_TYPE_INT64,  { .i64 = -1 },       -1, INT64_MAX, FLAGS },
     { "end_sample",   "Number of the first audio sample that should be "
         "dropped again",                                                 OFFSET(end_sample),   AV_OPT_TYPE_INT64,  { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
     { NULL }
 };
 #undef FLAGS

 AVFILTER_DEFINE_CLASS(atrim);

 static const AVFilterPad atrim_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_AUDIO,
         .filter_frame = atrim_filter_frame,
         .config_props = config_input,
     },
     { NULL }
 };

 static const AVFilterPad atrim_outputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_AUDIO,
     },
     { NULL }
 };

 AVFilter ff_af_atrim = {
     .name        = "atrim",
     .description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),
     .init        = init,
     .priv_size   = sizeof(TrimContext),
     .priv_class  = &atrim_class,
     .inputs      = atrim_inputs,
     .outputs     = atrim_outputs,
 };
 #endif // CONFIG_ATRIM_FILTER
	/*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <stdint.h>

	#include "config.h"

	#include "libavutil/avassert.h"
	#include "libavutil/channel_layout.h"
	#include "libavutil/common.h"
	#include "libavutil/log.h"
	#include "libavutil/mathematics.h"
	#include "libavutil/opt.h"
	#include "libavutil/samplefmt.h"

	#include "audio.h"
	#include "avfilter.h"
	#include "internal.h"

	typedef struct TrimContext {
	const AVClass *class;

	/*
	* AVOptions
	*/
	int64_t duration;
	int64_t start_time, end_time;
	int64_t start_frame, end_frame;
	/*
	* in the link timebase for video,
	* in 1/samplerate for audio
	*/
	int64_t start_pts, end_pts;
	int64_t start_sample, end_sample;

	/*
	* number of video frames that arrived on this filter so far
	*/
	int64_t nb_frames;
	/*
	* number of audio samples that arrived on this filter so far
	*/
	int64_t nb_samples;
	/*
	* timestamp of the first frame in the output, in the timebase units
	*/
	int64_t first_pts;
	/*
	* duration in the timebase units
	*/
	int64_t duration_tb;

	int64_t next_pts;

	int eof;
	} TrimContext;

	static av_cold int init(AVFilterContext *ctx)
	{
	TrimContext *s = ctx->priv;

	s->first_pts = AV_NOPTS_VALUE;

	return 0;
	}

	static int config_input(AVFilterLink *inlink)
	{
	AVFilterContext *ctx = inlink->dst;
	TrimContext *s = ctx->priv;
	AVRational tb = (inlink->type == AVMEDIA_TYPE_VIDEO) ?
	inlink->time_base : (AVRational){ 1, inlink->sample_rate };

	if (s->start_time != INT64_MAX) {
	int64_t start_pts = av_rescale_q(s->start_time, AV_TIME_BASE_Q, tb);
	if (s->start_pts == AV_NOPTS_VALUE \|\| start_pts < s->start_pts)
	s->start_pts = start_pts;
	}
	if (s->end_time != INT64_MAX) {
	int64_t end_pts = av_rescale_q(s->end_time, AV_TIME_BASE_Q, tb);
	if (s->end_pts == AV_NOPTS_VALUE \|\| end_pts > s->end_pts)
	s->end_pts = end_pts;
	}
	if (s->duration)
	s->duration_tb = av_rescale_q(s->duration, AV_TIME_BASE_Q, tb);

	return 0;
	}

	#define OFFSET(x) offsetof(TrimContext, x)
	#define COMMON_OPTS \
	{ "start", "Timestamp of the first frame that " \
	"should be passed", OFFSET(start_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
	{ "starti", "Timestamp of the first frame that " \
	"should be passed", OFFSET(start_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
	{ "end", "Timestamp of the first frame that " \
	"should be dropped again", OFFSET(end_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
	{ "endi", "Timestamp of the first frame that " \
	"should be dropped again", OFFSET(end_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
	{ "start_pts", "Timestamp of the first frame that should be " \
	" passed", OFFSET(start_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
	{ "end_pts", "Timestamp of the first frame that should be " \
	"dropped again", OFFSET(end_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
	{ "duration", "Maximum duration of the output", OFFSET(duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS }, \
	{ "durationi", "Maximum duration of the output", OFFSET(duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },


	#if CONFIG_TRIM_FILTER
	static int trim_filter_frame(AVFilterLink inlink, AVFrame frame)
	{
	AVFilterContext *ctx = inlink->dst;
	TrimContext *s = ctx->priv;
	int drop;

	/* drop everything if EOF has already been returned */
	if (s->eof) {
	av_frame_free(&frame);
	return 0;
	}

	if (s->start_frame >= 0 \|\| s->start_pts != AV_NOPTS_VALUE) {
	drop = 1;
	if (s->start_frame >= 0 && s->nb_frames >= s->start_frame)
	drop = 0;
	if (s->start_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
	frame->pts >= s->start_pts)
	drop = 0;
	if (drop)
	goto drop;
	}

	if (s->first_pts == AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE)
	s->first_pts = frame->pts;

	if (s->end_frame != INT64_MAX \|\| s->end_pts != AV_NOPTS_VALUE \|\| s->duration_tb) {
	drop = 1;

	if (s->end_frame != INT64_MAX && s->nb_frames < s->end_frame)
	drop = 0;
	if (s->end_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
	frame->pts < s->end_pts)
	drop = 0;
	if (s->duration_tb && frame->pts != AV_NOPTS_VALUE &&
	frame->pts - s->first_pts < s->duration_tb)
	drop = 0;

	if (drop) {
	s->eof = 1;
	ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);
	goto drop;
	}
	}

	s->nb_frames++;

	return ff_filter_frame(ctx->outputs[0], frame);

	drop:
	s->nb_frames++;
	av_frame_free(&frame);
	return 0;
	}

	#define FLAGS AV_OPT_FLAG_VIDEO_PARAM \| AV_OPT_FLAG_FILTERING_PARAM
	static const AVOption trim_options[] = {
	COMMON_OPTS
	{ "start_frame", "Number of the first frame that should be passed "
	"to the output", OFFSET(start_frame), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
	{ "end_frame", "Number of the first frame that should be dropped "
	"again", OFFSET(end_frame), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
	{ NULL }
	};
	#undef FLAGS

	AVFILTER_DEFINE_CLASS(trim);

	static const AVFilterPad trim_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.filter_frame = trim_filter_frame,
	.config_props = config_input,
	},
	{ NULL }
	};

	static const AVFilterPad trim_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	},
	{ NULL }
	};

	AVFilter ff_vf_trim = {
	.name = "trim",
	.description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),
	.init = init,
	.priv_size = sizeof(TrimContext),
	.priv_class = &trim_class,
	.inputs = trim_inputs,
	.outputs = trim_outputs,
	};
	#endif // CONFIG_TRIM_FILTER

	#if CONFIG_ATRIM_FILTER
	static int atrim_filter_frame(AVFilterLink inlink, AVFrame frame)
	{
	AVFilterContext *ctx = inlink->dst;
	TrimContext *s = ctx->priv;
	int64_t start_sample, end_sample;
	int64_t pts;
	int drop;

	/* drop everything if EOF has already been returned */
	if (s->eof) {
	av_frame_free(&frame);
	return 0;
	}

	if (frame->pts != AV_NOPTS_VALUE)
	pts = av_rescale_q(frame->pts, inlink->time_base,
	(AVRational){ 1, inlink->sample_rate });
	else
	pts = s->next_pts;
	s->next_pts = pts + frame->nb_samples;

	/* check if at least a part of the frame is after the start time */
	if (s->start_sample < 0 && s->start_pts == AV_NOPTS_VALUE) {
	start_sample = 0;
	} else {
	drop = 1;
	start_sample = frame->nb_samples;

	if (s->start_sample >= 0 &&
	s->nb_samples + frame->nb_samples > s->start_sample) {
	drop = 0;
	start_sample = FFMIN(start_sample, s->start_sample - s->nb_samples);
	}

	if (s->start_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
	pts + frame->nb_samples > s->start_pts) {
	drop = 0;
	start_sample = FFMIN(start_sample, s->start_pts - pts);
	}

	if (drop)
	goto drop;
	}

	if (s->first_pts == AV_NOPTS_VALUE)
	s->first_pts = pts + start_sample;

	/* check if at least a part of the frame is before the end time */
	if (s->end_sample == INT64_MAX && s->end_pts == AV_NOPTS_VALUE && !s->duration_tb) {
	end_sample = frame->nb_samples;
	} else {
	drop = 1;
	end_sample = 0;

	if (s->end_sample != INT64_MAX &&
	s->nb_samples < s->end_sample) {
	drop = 0;
	end_sample = FFMAX(end_sample, s->end_sample - s->nb_samples);
	}

	if (s->end_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
	pts < s->end_pts) {
	drop = 0;
	end_sample = FFMAX(end_sample, s->end_pts - pts);
	}

	if (s->duration_tb && pts - s->first_pts < s->duration_tb) {
	drop = 0;
	end_sample = FFMAX(end_sample, s->first_pts + s->duration_tb - pts);
	}

	if (drop) {
	s->eof = 1;
	ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);
	goto drop;
	}
	}

	s->nb_samples += frame->nb_samples;
	start_sample = FFMAX(0, start_sample);
	end_sample = FFMIN(frame->nb_samples, end_sample);
	if (start_sample >= end_sample \|\| !frame->nb_samples)
	goto drop;

	if (start_sample) {
	AVFrame *out = ff_get_audio_buffer(ctx->outputs[0], end_sample - start_sample);
	if (!out) {
	av_frame_free(&frame);
	return AVERROR(ENOMEM);
	}

	av_frame_copy_props(out, frame);
	av_samples_copy(out->extended_data, frame->extended_data, 0, start_sample,
	out->nb_samples, inlink->channels,
	frame->format);
	if (out->pts != AV_NOPTS_VALUE)
	out->pts += av_rescale_q(start_sample, (AVRational){ 1, out->sample_rate },
	inlink->time_base);

	av_frame_free(&frame);
	frame = out;
	} else
	frame->nb_samples = end_sample;

	return ff_filter_frame(ctx->outputs[0], frame);

	drop:
	s->nb_samples += frame->nb_samples;
	av_frame_free(&frame);
	return 0;
	}

	#define FLAGS AV_OPT_FLAG_AUDIO_PARAM \| AV_OPT_FLAG_FILTERING_PARAM
	static const AVOption atrim_options[] = {
	COMMON_OPTS
	{ "start_sample", "Number of the first audio sample that should be "
	"passed to the output", OFFSET(start_sample), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
	{ "end_sample", "Number of the first audio sample that should be "
	"dropped again", OFFSET(end_sample), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
	{ NULL }
	};
	#undef FLAGS

	AVFILTER_DEFINE_CLASS(atrim);

	static const AVFilterPad atrim_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_AUDIO,
	.filter_frame = atrim_filter_frame,
	.config_props = config_input,
	},
	{ NULL }
	};

	static const AVFilterPad atrim_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_AUDIO,
	},
	{ NULL }
	};

	AVFilter ff_af_atrim = {
	.name = "atrim",
	.description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),
	.init = init,
	.priv_size = sizeof(TrimContext),
	.priv_class = &atrim_class,
	.inputs = atrim_inputs,
	.outputs = atrim_outputs,
	};
	#endif // CONFIG_ATRIM_FILTER