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FFmpeg/libavfilter/vf_feedback.c
2023-10-30 16:06:46 +01:00

340 lines
9.5 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
*/
/**
* @file
* feedback video filter
*/
#include "libavutil/fifo.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/internal.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct FeedbackContext {
const AVClass *class;
int x, y;
int w, h;
int max_step[4];
int hsub, vsub;
AVFrame *feed;
AVFifo *fifo;
} FeedbackContext;
static void adjust_pos(AVFilterContext *ctx, FeedbackContext *s)
{
if (s->x + s->w > ctx->inputs[0]->w)
s->x = ctx->inputs[0]->w - s->w;
if (s->y + s->h > ctx->inputs[0]->h)
s->y = ctx->inputs[0]->h - s->h;
}
static void adjust_parameters(AVFilterContext *ctx, FeedbackContext *s)
{
if (s->x >= ctx->inputs[0]->w)
s->x = 0;
if (s->y >= ctx->inputs[0]->h)
s->y = 0;
if (s->w <= 0)
s->w = ctx->inputs[0]->w - s->x;
if (s->h <= 0)
s->h = ctx->inputs[0]->h - s->y;
if (s->w > ctx->inputs[0]->w)
s->w = ctx->inputs[0]->w;
if (s->h > ctx->inputs[0]->h)
s->h = ctx->inputs[0]->h;
adjust_pos(ctx, s);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
FeedbackContext *s = ctx->priv;
s->hsub = pix_desc->log2_chroma_w;
s->vsub = pix_desc->log2_chroma_h;
av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
adjust_parameters(ctx, s);
ctx->inputs[1]->w = s->w;
ctx->inputs[1]->h = s->h;
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
FeedbackContext *s = ctx->priv;
adjust_parameters(ctx, s);
ctx->outputs[0]->w = ctx->inputs[0]->w;
ctx->outputs[0]->h = ctx->inputs[0]->h;
ctx->outputs[1]->w = s->w;
ctx->outputs[1]->h = s->h;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, AV_PIX_FMT_FLAG_BITSTREAM |
AV_PIX_FMT_FLAG_HWACCEL |
AV_PIX_FMT_FLAG_PAL));
}
static int activate(AVFilterContext *ctx)
{
FeedbackContext *s = ctx->priv;
int status, ret;
int64_t pts;
adjust_pos(ctx, s);
for (int i = 0; i < ctx->nb_outputs; i++)
FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[i], ctx);
if (!s->feed) {
ret = ff_inlink_consume_frame(ctx->inputs[1], &s->feed);
if (ret < 0)
return ret;
}
if (s->feed && av_fifo_can_read(s->fifo)) {
AVFrame *src = s->feed;
AVFrame *dst = NULL;
av_fifo_read(s->fifo, &dst, 1);
if (!dst)
return AVERROR_BUG;
if (!av_frame_is_writable(dst)) {
AVFrame *tmp = ff_get_video_buffer(ctx->outputs[0], ctx->outputs[0]->w, ctx->outputs[0]->h);
if (!tmp) {
av_frame_free(&dst);
return AVERROR(ENOMEM);
}
ret = av_frame_copy(tmp, dst);
if (ret < 0) {
av_frame_free(&dst);
av_frame_free(&tmp);
return ret;
}
av_frame_copy_props(tmp, dst);
av_frame_free(&dst);
dst = tmp;
}
for (int y = 0; y < src->height; y++) {
memmove(dst->data[0] + (s->y + y) * dst->linesize[0] + s->x * s->max_step[0],
src->data[0] + y * src->linesize[0], src->width * s->max_step[0]);
}
for (int i = 1; i < 3; i++) {
if (dst->data[i]) {
for (int y = 0; y < src->height; y++) {
memmove(dst->data[i] + ((s->y + y) >> s->vsub) * dst->linesize[i] + (s->x >> s->hsub) * s->max_step[i],
src->data[i] + (y >> s->vsub) * src->linesize[i], (src->width >> s->hsub) * s->max_step[i]);
}
}
}
if (dst->data[3]) {
for (int y = 0; y < src->height; y++) {
memmove(dst->data[3] + (s->y + y) * dst->linesize[3] + s->x * s->max_step[3],
src->data[3] + y * src->linesize[3], src->width * s->max_step[3]);
}
}
ret = ff_filter_frame(ctx->outputs[0], dst);
av_frame_free(&s->feed);
return ret;
}
if (!s->feed || ctx->is_disabled) {
AVFrame *in = NULL;
ret = ff_inlink_consume_frame(ctx->inputs[0], &in);
if (ret < 0)
return ret;
if (ret > 0 && ctx->is_disabled)
return ff_filter_frame(ctx->outputs[0], in);
if (ret > 0) {
AVFrame *frame;
ret = av_fifo_write(s->fifo, &in, 1);
if (ret < 0) {
av_frame_free(&in);
return ret;
}
frame = av_frame_clone(in);
if (!frame)
return AVERROR(ENOMEM);
frame->width = s->w;
frame->height = s->h;
frame->data[0] += s->y * frame->linesize[0];
frame->data[0] += s->x * s->max_step[0];
for (int i = 1; i < 3; i ++) {
if (frame->data[i]) {
frame->data[i] += (s->y >> s->vsub) * frame->linesize[i];
frame->data[i] += (s->x >> s->hsub) * s->max_step[i];
}
}
if (frame->data[3]) {
frame->data[3] += s->y * frame->linesize[3];
frame->data[3] += s->x * s->max_step[3];
}
return ff_filter_frame(ctx->outputs[1], frame);
}
}
if (ff_inlink_acknowledge_status(ctx->inputs[0], &status, &pts)) {
ff_outlink_set_status(ctx->outputs[0], status, pts);
ff_outlink_set_status(ctx->outputs[1], status, pts);
return 0;
}
if (ff_inlink_acknowledge_status(ctx->inputs[1], &status, &pts)) {
ff_outlink_set_status(ctx->outputs[0], status, pts);
ff_outlink_set_status(ctx->outputs[1], status, pts);
return 0;
}
if (!s->feed || ctx->is_disabled) {
if (ff_outlink_frame_wanted(ctx->outputs[0])) {
ff_inlink_request_frame(ctx->inputs[0]);
if (!ctx->is_disabled)
ff_inlink_request_frame(ctx->inputs[1]);
return 0;
}
}
return FFERROR_NOT_READY;
}
static av_cold int init(AVFilterContext *ctx)
{
FeedbackContext *s = ctx->priv;
s->fifo = av_fifo_alloc2(8, sizeof(AVFrame *), AV_FIFO_FLAG_AUTO_GROW);
if (!s->fifo)
return AVERROR(ENOMEM);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
FeedbackContext *s = ctx->priv;
if (s->fifo) {
size_t size = av_fifo_can_read(s->fifo);
for (size_t n = 0; n < size; n++) {
AVFrame *frame = NULL;
av_fifo_read(s->fifo, &frame, 1);
av_frame_free(&frame);
}
av_fifo_freep2(&s->fifo);
}
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
},
{
.name = "feedin",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
},
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{
.name = "feedout",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
#define OFFSET(x) offsetof(FeedbackContext, x)
#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM)
#define TFLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM)
static const AVOption feedback_options[] = {
{ "x", "set top left crop position", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, TFLAGS },
{ "y", "set top left crop position", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, TFLAGS },
{ "w", "set crop size", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ "h", "set crop size", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(feedback);
const AVFilter ff_vf_feedback = {
.name = "feedback",
.description = NULL_IF_CONFIG_SMALL("Apply feedback video filter."),
.priv_class = &feedback_class,
.priv_size = sizeof(FeedbackContext),
.activate = activate,
.init = init,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
.process_command = ff_filter_process_command,
};