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FFmpeg/libavfilter/f_segment.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

343 lines
9.3 KiB
C

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