375 lines
13 KiB
C
375 lines
13 KiB
C
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include "config.h"
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#include "libavutil/avassert.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/common.h"
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#include "libavutil/log.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/samplefmt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "internal.h"
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typedef struct TrimContext {
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const AVClass *class;
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/*
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* AVOptions
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*/
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int64_t duration;
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int64_t start_time, end_time;
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int64_t start_frame, end_frame;
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/*
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* in the link timebase for video,
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* in 1/samplerate for audio
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*/
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int64_t start_pts, end_pts;
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int64_t start_sample, end_sample;
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/*
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* number of video frames that arrived on this filter so far
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*/
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int64_t nb_frames;
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/*
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* number of audio samples that arrived on this filter so far
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*/
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int64_t nb_samples;
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/*
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* timestamp of the first frame in the output, in the timebase units
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*/
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int64_t first_pts;
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/*
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* duration in the timebase units
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*/
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int64_t duration_tb;
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int64_t next_pts;
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int eof;
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} TrimContext;
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static av_cold int init(AVFilterContext *ctx)
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{
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TrimContext *s = ctx->priv;
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s->first_pts = AV_NOPTS_VALUE;
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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TrimContext *s = ctx->priv;
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AVRational tb = (inlink->type == AVMEDIA_TYPE_VIDEO) ?
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inlink->time_base : (AVRational){ 1, inlink->sample_rate };
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if (s->start_time != INT64_MAX) {
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int64_t start_pts = av_rescale_q(s->start_time, AV_TIME_BASE_Q, tb);
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if (s->start_pts == AV_NOPTS_VALUE || start_pts < s->start_pts)
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s->start_pts = start_pts;
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}
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if (s->end_time != INT64_MAX) {
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int64_t end_pts = av_rescale_q(s->end_time, AV_TIME_BASE_Q, tb);
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if (s->end_pts == AV_NOPTS_VALUE || end_pts > s->end_pts)
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s->end_pts = end_pts;
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}
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if (s->duration)
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s->duration_tb = av_rescale_q(s->duration, AV_TIME_BASE_Q, tb);
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return 0;
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}
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#define OFFSET(x) offsetof(TrimContext, x)
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#define COMMON_OPTS \
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{ "start", "Timestamp of the first frame that " \
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"should be passed", OFFSET(start_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
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{ "starti", "Timestamp of the first frame that " \
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"should be passed", OFFSET(start_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
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{ "end", "Timestamp of the first frame that " \
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"should be dropped again", OFFSET(end_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
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{ "endi", "Timestamp of the first frame that " \
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"should be dropped again", OFFSET(end_time), AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX }, INT64_MIN, INT64_MAX, FLAGS }, \
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{ "start_pts", "Timestamp of the first frame that should be " \
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" passed", OFFSET(start_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
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{ "end_pts", "Timestamp of the first frame that should be " \
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"dropped again", OFFSET(end_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \
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{ "duration", "Maximum duration of the output", OFFSET(duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS }, \
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{ "durationi", "Maximum duration of the output", OFFSET(duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
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#if CONFIG_TRIM_FILTER
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static int trim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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TrimContext *s = ctx->priv;
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int drop;
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/* drop everything if EOF has already been returned */
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if (s->eof) {
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av_frame_free(&frame);
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return 0;
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}
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if (s->start_frame >= 0 || s->start_pts != AV_NOPTS_VALUE) {
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drop = 1;
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if (s->start_frame >= 0 && s->nb_frames >= s->start_frame)
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drop = 0;
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if (s->start_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
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frame->pts >= s->start_pts)
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drop = 0;
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if (drop)
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goto drop;
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}
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if (s->first_pts == AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE)
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s->first_pts = frame->pts;
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if (s->end_frame != INT64_MAX || s->end_pts != AV_NOPTS_VALUE || s->duration_tb) {
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drop = 1;
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if (s->end_frame != INT64_MAX && s->nb_frames < s->end_frame)
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drop = 0;
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if (s->end_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&
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frame->pts < s->end_pts)
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drop = 0;
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if (s->duration_tb && frame->pts != AV_NOPTS_VALUE &&
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frame->pts - s->first_pts < s->duration_tb)
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drop = 0;
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if (drop) {
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s->eof = 1;
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ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);
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goto drop;
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}
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}
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s->nb_frames++;
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return ff_filter_frame(ctx->outputs[0], frame);
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drop:
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s->nb_frames++;
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av_frame_free(&frame);
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return 0;
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}
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption trim_options[] = {
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COMMON_OPTS
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{ "start_frame", "Number of the first frame that should be passed "
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"to the output", OFFSET(start_frame), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
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{ "end_frame", "Number of the first frame that should be dropped "
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"again", OFFSET(end_frame), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
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{ NULL }
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};
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#undef FLAGS
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AVFILTER_DEFINE_CLASS(trim);
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static const AVFilterPad trim_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = trim_filter_frame,
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.config_props = config_input,
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},
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{ NULL }
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};
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static const AVFilterPad trim_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_trim = {
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.name = "trim",
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.description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),
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.init = init,
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.priv_size = sizeof(TrimContext),
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.priv_class = &trim_class,
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.inputs = trim_inputs,
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.outputs = trim_outputs,
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};
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#endif // CONFIG_TRIM_FILTER
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#if CONFIG_ATRIM_FILTER
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static int atrim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *ctx = inlink->dst;
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TrimContext *s = ctx->priv;
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int64_t start_sample, end_sample;
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int64_t pts;
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int drop;
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/* drop everything if EOF has already been returned */
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if (s->eof) {
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av_frame_free(&frame);
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return 0;
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}
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if (frame->pts != AV_NOPTS_VALUE)
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pts = av_rescale_q(frame->pts, inlink->time_base,
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(AVRational){ 1, inlink->sample_rate });
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else
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pts = s->next_pts;
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s->next_pts = pts + frame->nb_samples;
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/* check if at least a part of the frame is after the start time */
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if (s->start_sample < 0 && s->start_pts == AV_NOPTS_VALUE) {
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start_sample = 0;
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} else {
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drop = 1;
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start_sample = frame->nb_samples;
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if (s->start_sample >= 0 &&
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s->nb_samples + frame->nb_samples > s->start_sample) {
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drop = 0;
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start_sample = FFMIN(start_sample, s->start_sample - s->nb_samples);
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}
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if (s->start_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
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pts + frame->nb_samples > s->start_pts) {
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drop = 0;
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start_sample = FFMIN(start_sample, s->start_pts - pts);
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}
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if (drop)
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goto drop;
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}
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if (s->first_pts == AV_NOPTS_VALUE)
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s->first_pts = pts + start_sample;
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/* check if at least a part of the frame is before the end time */
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if (s->end_sample == INT64_MAX && s->end_pts == AV_NOPTS_VALUE && !s->duration_tb) {
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end_sample = frame->nb_samples;
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} else {
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drop = 1;
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end_sample = 0;
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if (s->end_sample != INT64_MAX &&
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s->nb_samples < s->end_sample) {
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drop = 0;
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end_sample = FFMAX(end_sample, s->end_sample - s->nb_samples);
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}
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if (s->end_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&
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pts < s->end_pts) {
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drop = 0;
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end_sample = FFMAX(end_sample, s->end_pts - pts);
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}
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if (s->duration_tb && pts - s->first_pts < s->duration_tb) {
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drop = 0;
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end_sample = FFMAX(end_sample, s->first_pts + s->duration_tb - pts);
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}
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if (drop) {
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s->eof = 1;
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ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);
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goto drop;
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}
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}
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s->nb_samples += frame->nb_samples;
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start_sample = FFMAX(0, start_sample);
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end_sample = FFMIN(frame->nb_samples, end_sample);
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if (start_sample >= end_sample || !frame->nb_samples)
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goto drop;
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if (start_sample) {
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AVFrame *out = ff_get_audio_buffer(ctx->outputs[0], end_sample - start_sample);
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if (!out) {
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av_frame_free(&frame);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, frame);
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av_samples_copy(out->extended_data, frame->extended_data, 0, start_sample,
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out->nb_samples, inlink->channels,
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frame->format);
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if (out->pts != AV_NOPTS_VALUE)
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out->pts += av_rescale_q(start_sample, (AVRational){ 1, out->sample_rate },
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inlink->time_base);
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av_frame_free(&frame);
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frame = out;
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} else
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frame->nb_samples = end_sample;
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return ff_filter_frame(ctx->outputs[0], frame);
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drop:
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s->nb_samples += frame->nb_samples;
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av_frame_free(&frame);
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return 0;
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}
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption atrim_options[] = {
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COMMON_OPTS
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{ "start_sample", "Number of the first audio sample that should be "
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"passed to the output", OFFSET(start_sample), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },
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{ "end_sample", "Number of the first audio sample that should be "
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"dropped again", OFFSET(end_sample), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },
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{ NULL }
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};
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#undef FLAGS
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AVFILTER_DEFINE_CLASS(atrim);
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static const AVFilterPad atrim_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = atrim_filter_frame,
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.config_props = config_input,
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},
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{ NULL }
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};
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|
||
|
|
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
|