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https://github.com/FFmpeg/FFmpeg.git
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avfilter: add (a)segment filters
This commit is contained in:
Paul B Mahol
335
libavfilter/f_segment.c
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335
libavfilter/f_segment.c
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@@ -0,0 +1,335 @@
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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 "libavutil/avstring.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/parseutils.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 "filters.h"
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#include "internal.h"
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typedef struct SegmentContext {
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const AVClass *class;
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char *timestamps_str;
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char *points_str;
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int use_timestamps;
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int current_point;
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int nb_points;
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int64_t *points;
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} SegmentContext;
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static void count_points(char *item_str, int *nb_items)
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{
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char *p;
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if (!item_str)
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return;
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*nb_items = 1;
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for (p = item_str; *p; p++) {
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if (*p == '|')
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(*nb_items)++;
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}
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}
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static int parse_points(AVFilterContext *ctx, char *item_str, int nb_points, int64_t *points)
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{
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SegmentContext *s = ctx->priv;
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char *arg, *p = item_str;
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char *saveptr = NULL;
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int64_t ref, cur = 0;
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int ret = 0;
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for (int i = 0; i < nb_points; i++) {
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if (!(arg = av_strtok(p, "|", &saveptr)))
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return AVERROR(EINVAL);
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p = NULL;
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ref = 0;
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if (*arg == '+') {
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ref = cur;
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arg++;
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}
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if (s->use_timestamps) {
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ret = av_parse_time(&points[i], arg, s->use_timestamps);
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} else {
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if (sscanf(arg, "%"SCNd64, &points[i]) != 1)
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ret = AVERROR(EINVAL);
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}
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid splits supplied: %s\n", arg);
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return ret;
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}
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cur = points[i];
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points[i] += ref;
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}
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx, enum AVMediaType type)
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{
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SegmentContext *s = ctx->priv;
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char *split_str;
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int ret;
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if (s->timestamps_str && s->points_str) {
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av_log(ctx, AV_LOG_ERROR, "Both timestamps and counts supplied.\n");
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return AVERROR(EINVAL);
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} else if (s->timestamps_str) {
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s->use_timestamps = 1;
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split_str = s->timestamps_str;
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} else if (s->points_str) {
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split_str = s->points_str;
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} else {
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av_log(ctx, AV_LOG_ERROR, "Neither timestamps nor durations nor counts supplied.\n");
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return AVERROR(EINVAL);
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}
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count_points(split_str, &s->nb_points);
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s->nb_points++;
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s->points = av_calloc(s->nb_points, sizeof(*s->points));
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if (!s->points)
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return AVERROR(ENOMEM);
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ret = parse_points(ctx, split_str, s->nb_points - 1, s->points);
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if (ret < 0)
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return ret;
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s->points[s->nb_points - 1] = INT64_MAX;
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for (int i = 0; i < s->nb_points; i++) {
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AVFilterPad pad = { 0 };
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pad.type = type;
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pad.name = av_asprintf("output%d", i);
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if (!pad.name)
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return AVERROR(ENOMEM);
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if ((ret = ff_insert_outpad(ctx, i, &pad)) < 0) {
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av_freep(&pad.name);
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return ret;
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}
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}
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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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SegmentContext *s = ctx->priv;
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AVRational tb = inlink->time_base;
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if (s->use_timestamps) {
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for (int i = 0; i < s->nb_points - 1; i++)
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s->points[i] = av_rescale_q(s->points[i], AV_TIME_BASE_Q, tb);
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}
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return 0;
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}
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static int current_segment_finished(AVFilterContext *ctx, AVFrame *frame)
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{
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SegmentContext *s = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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int ret = 0;
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if (s->use_timestamps) {
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ret = frame->pts >= s->points[s->current_point];
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} else {
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switch (inlink->type) {
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case AVMEDIA_TYPE_VIDEO:
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ret = inlink->frame_count_out - 1 >= s->points[s->current_point];
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break;
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case AVMEDIA_TYPE_AUDIO:
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ret = inlink->sample_count_out - frame->nb_samples >= s->points[s->current_point];
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break;
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}
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}
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return ret;
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}
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *inlink = ctx->inputs[0];
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SegmentContext *s = ctx->priv;
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AVFrame *frame = NULL;
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int ret, status;
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int max_samples;
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int64_t diff;
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int64_t pts;
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for (int i = s->current_point; i < s->nb_points; i++) {
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FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[i], ctx);
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}
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switch (inlink->type) {
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case AVMEDIA_TYPE_VIDEO:
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ret = ff_inlink_consume_frame(inlink, &frame);
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break;
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case AVMEDIA_TYPE_AUDIO:
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diff = s->points[s->current_point] - inlink->sample_count_out;
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if (s->use_timestamps) {
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max_samples = av_rescale_q(diff, av_make_q(1, inlink->sample_rate), inlink->time_base);
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} else {
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max_samples = FFMAX(1, FFMIN(diff, INT_MAX));
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}
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ret = ff_inlink_consume_samples(inlink, 1, max_samples, &frame);
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break;
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}
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if (ret > 0) {
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while (current_segment_finished(ctx, frame)) {
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ff_outlink_set_status(ctx->outputs[s->current_point], AVERROR_EOF, frame->pts);
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s->current_point++;
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}
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if (s->current_point >= s->nb_points) {
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av_frame_free(&frame);
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return AVERROR(EINVAL);
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}
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ret = ff_filter_frame(ctx->outputs[s->current_point], frame);
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}
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if (ret < 0) {
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return ret;
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} else if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
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for (int i = s->current_point; i < s->nb_points; i++)
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ff_outlink_set_status(ctx->outputs[i], status, pts);
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return 0;
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} else {
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for (int i = s->current_point; i < s->nb_points; i++) {
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if (ff_outlink_frame_wanted(ctx->outputs[i]))
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ff_inlink_request_frame(inlink);
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}
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return 0;
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}
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SegmentContext *s = ctx->priv;
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av_freep(&s->points);
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for (unsigned i = 0; i < ctx->nb_outputs; i++)
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av_freep(&ctx->output_pads[i].name);
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}
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#define OFFSET(x) offsetof(SegmentContext, x)
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#define COMMON_OPTS \
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{ "timestamps", "timestamps of input at which to split input", OFFSET(timestamps_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS }, \
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#if CONFIG_SEGMENT_FILTER
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static av_cold int video_init(AVFilterContext *ctx)
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{
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return init(ctx, AVMEDIA_TYPE_VIDEO);
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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 segment_options[] = {
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COMMON_OPTS
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{ "frames", "frames at which to split input", OFFSET(points_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
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{ NULL }
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};
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#undef FLAGS
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AVFILTER_DEFINE_CLASS(segment);
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static const AVFilterPad segment_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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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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const AVFilter ff_vf_segment = {
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.name = "segment",
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.description = NULL_IF_CONFIG_SMALL("Segment video stream."),
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.init = video_init,
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.uninit = uninit,
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.priv_size = sizeof(SegmentContext),
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.priv_class = &segment_class,
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.activate = activate,
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.inputs = segment_inputs,
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.outputs = NULL,
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.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
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};
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#endif // CONFIG_SEGMENT_FILTER
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#if CONFIG_ASEGMENT_FILTER
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static av_cold int audio_init(AVFilterContext *ctx)
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{
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return init(ctx, AVMEDIA_TYPE_AUDIO);
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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 asegment_options[] = {
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COMMON_OPTS
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{ "samples", "samples at which to split input", OFFSET(points_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
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{ NULL }
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};
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#undef FLAGS
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AVFILTER_DEFINE_CLASS(asegment);
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static const AVFilterPad asegment_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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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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const AVFilter ff_af_asegment = {
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.name = "asegment",
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.description = NULL_IF_CONFIG_SMALL("Segment audio stream."),
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.init = audio_init,
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.uninit = uninit,
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.priv_size = sizeof(SegmentContext),
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.priv_class = &asegment_class,
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.activate = activate,
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.inputs = asegment_inputs,
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.outputs = NULL,
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.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
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};
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#endif // CONFIG_ASEGMENT_FILTER
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