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FFmpeg/libavfilter/f_loop.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

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/*
* Copyright (c) 2016 Paul B Mahol
*
* 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 "libavutil/audio_fifo.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "audio.h"
#include "filters.h"
#include "internal.h"
#include "video.h"
typedef struct LoopContext {
const AVClass *class;
AVAudioFifo *fifo;
AVAudioFifo *left;
AVFrame **frames;
int nb_frames;
int current_frame;
int64_t time_pts;
int64_t duration;
int64_t current_sample;
int64_t nb_samples;
int64_t ignored_samples;
int loop;
int eof;
int64_t size;
int64_t start;
int64_t time;
int64_t pts;
int64_t pts_offset;
int64_t eof_pts;
} LoopContext;
#define AFLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define VFLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define OFFSET(x) offsetof(LoopContext, x)
static void check_size(AVFilterContext *ctx)
{
LoopContext *s = ctx->priv;
if (!s->size)
av_log(ctx, AV_LOG_WARNING, "Number of %s to loop is not set!\n",
ctx->input_pads[0].type == AVMEDIA_TYPE_VIDEO ? "frames" : "samples");
}
static void update_time(AVFilterContext *ctx, AVRational tb)
{
LoopContext *s = ctx->priv;
if (s->time != INT64_MAX) {
int64_t time_pts = av_rescale_q(s->time, AV_TIME_BASE_Q, tb);
if (s->time_pts == AV_NOPTS_VALUE || time_pts < s->time_pts)
s->time_pts = time_pts;
}
}
#if CONFIG_ALOOP_FILTER
static int aconfig_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
LoopContext *s = ctx->priv;
s->time_pts = AV_NOPTS_VALUE;
s->fifo = av_audio_fifo_alloc(inlink->format, inlink->ch_layout.nb_channels, 8192);
s->left = av_audio_fifo_alloc(inlink->format, inlink->ch_layout.nb_channels, 8192);
if (!s->fifo || !s->left)
return AVERROR(ENOMEM);
check_size(ctx);
return 0;
}
static av_cold void auninit(AVFilterContext *ctx)
{
LoopContext *s = ctx->priv;
av_audio_fifo_free(s->fifo);
av_audio_fifo_free(s->left);
}
static int push_samples(AVFilterContext *ctx, int nb_samples)
{
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
AVFrame *out;
int ret = 0, i = 0;
while (s->loop != 0 && i < nb_samples) {
out = ff_get_audio_buffer(outlink, FFMIN(nb_samples, s->nb_samples - s->current_sample));
if (!out)
return AVERROR(ENOMEM);
ret = av_audio_fifo_peek_at(s->fifo, (void **)out->extended_data, out->nb_samples, s->current_sample);
if (ret < 0) {
av_frame_free(&out);
return ret;
}
out->pts = s->pts;
out->nb_samples = ret;
s->pts += av_rescale_q(out->nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
i += out->nb_samples;
s->current_sample += out->nb_samples;
ret = ff_filter_frame(outlink, out);
if (ret < 0)
return ret;
if (s->current_sample >= s->nb_samples) {
s->current_sample = 0;
if (s->loop > 0)
s->loop--;
}
}
return ret;
}
static int afilter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
int ret = 0;
if (((s->start >= 0 && s->ignored_samples + frame->nb_samples > s->start) ||
(s->time_pts != AV_NOPTS_VALUE &&
frame->pts >= s->time_pts)) &&
s->size > 0 && s->loop != 0) {
if (s->nb_samples < s->size) {
int written = FFMIN(frame->nb_samples, s->size - s->nb_samples);
int drain = 0;
if (s->start < 0)
s->start = inlink->sample_count_out - written;
ret = av_audio_fifo_write(s->fifo, (void **)frame->extended_data, written);
if (ret < 0)
return ret;
if (!s->nb_samples) {
drain = FFMAX(0, s->start - s->ignored_samples);
s->pts = frame->pts;
av_audio_fifo_drain(s->fifo, drain);
s->pts += av_rescale_q(s->start - s->ignored_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
}
s->nb_samples += ret - drain;
drain = frame->nb_samples - written;
if (s->nb_samples == s->size && drain > 0) {
int ret2;
ret2 = av_audio_fifo_write(s->left, (void **)frame->extended_data, frame->nb_samples);
if (ret2 < 0)
return ret2;
av_audio_fifo_drain(s->left, drain);
}
frame->nb_samples = ret;
s->pts += av_rescale_q(ret, (AVRational){1, outlink->sample_rate}, outlink->time_base);
ret = ff_filter_frame(outlink, frame);
} else {
int nb_samples = frame->nb_samples;
av_frame_free(&frame);
ret = push_samples(ctx, nb_samples);
}
} else {
s->ignored_samples += frame->nb_samples;
frame->pts = s->pts;
s->pts += av_rescale_q(frame->nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
ret = ff_filter_frame(outlink, frame);
}
return ret;
}
static int arequest_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
LoopContext *s = ctx->priv;
int ret = 0;
if ((!s->size) ||
(s->nb_samples < s->size) ||
(s->nb_samples >= s->size && s->loop == 0)) {
int nb_samples = av_audio_fifo_size(s->left);
if (s->loop == 0 && nb_samples > 0) {
AVFrame *out;
out = ff_get_audio_buffer(outlink, nb_samples);
if (!out)
return AVERROR(ENOMEM);
av_audio_fifo_read(s->left, (void **)out->extended_data, nb_samples);
out->pts = s->pts;
s->pts += av_rescale_q(nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
ret = ff_filter_frame(outlink, out);
if (ret < 0)
return ret;
}
ret = ff_request_frame(ctx->inputs[0]);
} else {
ret = push_samples(ctx, 1024);
}
if (s->eof && s->nb_samples > 0 && s->loop != 0) {
ret = push_samples(ctx, 1024);
}
return ret;
}
static int aactivate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
AVFrame *frame = NULL;
int ret, status;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
update_time(ctx, inlink->time_base);
if (!s->eof && (s->nb_samples < s->size || !s->loop || !s->size)) {
const int in_nb_samples = FFMIN(1024, s->size - s->nb_samples);
if (in_nb_samples == 0)
ret = ff_inlink_consume_frame(inlink, &frame);
else
ret = ff_inlink_consume_samples(inlink, in_nb_samples, in_nb_samples, &frame);
if (ret < 0)
return ret;
if (ret > 0)
return afilter_frame(inlink, frame);
}
if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &s->eof_pts)) {
if (status == AVERROR_EOF) {
s->size = s->nb_samples;
s->eof = 1;
}
}
if (s->eof && (!s->loop || !s->size)) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts + s->pts_offset);
return 0;
}
if (!s->eof && (!s->size ||
(s->nb_samples < s->size) ||
(s->nb_samples >= s->size && s->loop == 0))) {
FF_FILTER_FORWARD_WANTED(outlink, inlink);
} else if (s->loop && s->nb_samples == s->size) {
return arequest_frame(outlink);
}
return FFERROR_NOT_READY;
}
static const AVOption aloop_options[] = {
{ "loop", "number of loops", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, INT_MAX, AFLAGS },
{ "size", "max number of samples to loop", OFFSET(size), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT32_MAX, AFLAGS },
{ "start", "set the loop start sample", OFFSET(start), AV_OPT_TYPE_INT64, {.i64 = 0 }, -1, INT64_MAX, AFLAGS },
{ "time", "set the loop start time", OFFSET(time), AV_OPT_TYPE_DURATION, {.i64=INT64_MAX}, INT64_MIN, INT64_MAX, AFLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(aloop);
static const AVFilterPad ainputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = aconfig_input,
},
};
const AVFilter ff_af_aloop = {
.name = "aloop",
.description = NULL_IF_CONFIG_SMALL("Loop audio samples."),
.priv_size = sizeof(LoopContext),
.priv_class = &aloop_class,
.activate = aactivate,
.uninit = auninit,
FILTER_INPUTS(ainputs),
FILTER_OUTPUTS(ff_audio_default_filterpad),
};
#endif /* CONFIG_ALOOP_FILTER */
#if CONFIG_LOOP_FILTER
static av_cold int init(AVFilterContext *ctx)
{
LoopContext *s = ctx->priv;
s->time_pts = AV_NOPTS_VALUE;
s->frames = av_calloc(s->size, sizeof(*s->frames));
if (!s->frames)
return AVERROR(ENOMEM);
check_size(ctx);
return 0;
}
static void free_frames(AVFilterContext *ctx)
{
LoopContext *s = ctx->priv;
for (int i = 0; i < s->nb_frames; i++)
av_frame_free(&s->frames[i]);
}
static av_cold void uninit(AVFilterContext *ctx)
{
LoopContext *s = ctx->priv;
free_frames(ctx);
av_freep(&s->frames);
s->nb_frames = 0;
}
static int push_frame(AVFilterContext *ctx)
{
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
AVFrame *out;
int ret;
out = av_frame_clone(s->frames[s->current_frame]);
if (!out)
return AVERROR(ENOMEM);
out->pts += s->pts_offset;
ret = ff_filter_frame(outlink, out);
s->current_frame++;
if (s->current_frame >= s->nb_frames) {
s->current_frame = 0;
s->pts_offset += s->duration;
if (s->loop > 0)
s->loop--;
if (s->loop == 0)
free_frames(ctx);
}
return ret;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
int64_t duration;
int ret = 0;
if (((s->start >= 0 && inlink->frame_count_out >= s->start) ||
(s->time_pts != AV_NOPTS_VALUE &&
frame->pts >= s->time_pts)) &&
s->size > 0 && s->loop != 0) {
if (s->nb_frames < s->size) {
s->frames[s->nb_frames] = av_frame_clone(frame);
if (!s->frames[s->nb_frames]) {
av_frame_free(&frame);
return AVERROR(ENOMEM);
}
s->nb_frames++;
if (frame->duration)
duration = frame->duration;
else
duration = av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
s->duration += duration;
s->pts_offset = s->duration;
ret = ff_filter_frame(outlink, frame);
} else {
av_frame_free(&frame);
ret = push_frame(ctx);
}
} else {
frame->pts += s->pts_offset - s->duration;
ret = ff_filter_frame(outlink, frame);
}
return ret;
}
static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
LoopContext *s = ctx->priv;
AVFrame *frame = NULL;
int ret, status;
ret = ff_outlink_get_status(outlink);
if (ret) {
ff_inlink_set_status(inlink, ret);
free_frames(ctx);
return 0;
}
update_time(ctx, inlink->time_base);
if (!s->eof && (s->nb_frames < s->size || !s->loop || !s->size)) {
ret = ff_inlink_consume_frame(inlink, &frame);
if (ret < 0)
return ret;
if (ret > 0)
return filter_frame(inlink, frame);
}
if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &s->eof_pts)) {
if (status == AVERROR_EOF) {
s->size = s->nb_frames;
s->eof = 1;
}
}
if (s->eof && (!s->loop || !s->size)) {
ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts + s->pts_offset);
free_frames(ctx);
return 0;
}
if (!s->eof && (!s->size ||
(s->nb_frames < s->size) ||
(s->nb_frames >= s->size && s->loop == 0))) {
FF_FILTER_FORWARD_WANTED(outlink, inlink);
} else if (s->loop && s->nb_frames == s->size) {
return push_frame(ctx);
}
return FFERROR_NOT_READY;
}
static const AVOption loop_options[] = {
{ "loop", "number of loops", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, INT_MAX, VFLAGS },
{ "size", "max number of frames to loop", OFFSET(size), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT16_MAX, VFLAGS },
{ "start", "set the loop start frame", OFFSET(start), AV_OPT_TYPE_INT64, {.i64 = 0 }, -1, INT64_MAX, VFLAGS },
{ "time", "set the loop start time", OFFSET(time), AV_OPT_TYPE_DURATION, {.i64=INT64_MAX}, INT64_MIN, INT64_MAX, VFLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(loop);
const AVFilter ff_vf_loop = {
.name = "loop",
.description = NULL_IF_CONFIG_SMALL("Loop video frames."),
.priv_size = sizeof(LoopContext),
.priv_class = &loop_class,
.init = init,
.uninit = uninit,
.activate = activate,
FILTER_INPUTS(ff_video_default_filterpad),
FILTER_OUTPUTS(ff_video_default_filterpad),
};
#endif /* CONFIG_LOOP_FILTER */
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