Signed-off-by: Paul B Mahol <one...@gmail.com>
---
Useful to only filter part of video frame, without using complicated and slow
split+crop+overlay combination.
---
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_feedback.c | 249 ++++++++++++++++++++++++++++++++++++++
3 files changed, 251 insertions(+)
create mode 100644 libavfilter/vf_feedback.c
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index d69bd59bb6..bdfdfdc04a 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -279,6 +279,7 @@ OBJS-$(CONFIG_ESTDIF_FILTER) += vf_estdif.o
OBJS-$(CONFIG_EXPOSURE_FILTER) += vf_exposure.o
OBJS-$(CONFIG_EXTRACTPLANES_FILTER) += vf_extractplanes.o
OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o
+OBJS-$(CONFIG_FEEDBACK_FILTER) += vf_feedback.o
OBJS-$(CONFIG_FFTDNOIZ_FILTER) += vf_fftdnoiz.o
OBJS-$(CONFIG_FFTFILT_FILTER) += vf_fftfilt.o
OBJS-$(CONFIG_FIELD_FILTER) += vf_field.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index abd1fe2367..44fac46521 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -261,6 +261,7 @@ extern const AVFilter ff_vf_estdif;
extern const AVFilter ff_vf_exposure;
extern const AVFilter ff_vf_extractplanes;
extern const AVFilter ff_vf_fade;
+extern const AVFilter ff_vf_feedback;
extern const AVFilter ff_vf_fftdnoiz;
extern const AVFilter ff_vf_fftfilt;
extern const AVFilter ff_vf_field;
diff --git a/libavfilter/vf_feedback.c b/libavfilter/vf_feedback.c
new file mode 100644
index 0000000000..eb3ac4539d
--- /dev/null
+++ b/libavfilter/vf_feedback.c
@@ -0,0 +1,249 @@
+/*
+ * 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/avstring.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/internal.h"
+#include "avfilter.h"
+#include "filters.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct FeedbackContext {
+ const AVClass *class;
+
+ int x[2];
+ int y[2];
+
+ int max_step[4];
+ int hsub, vsub;
+
+ AVFrame *in[2];
+} FeedbackContext;
+
+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;
+
+ if (s->x[0] >= ctx->inputs[0]->w)
+ s->x[0] = 0;
+
+ if (s->x[1] >= ctx->inputs[0]->w)
+ s->x[1] = ctx->inputs[0]->w;
+
+ if (s->y[0] >= ctx->inputs[0]->h)
+ s->y[0] = 0;
+
+ if (s->y[1] >= ctx->inputs[0]->h)
+ s->y[1] = ctx->inputs[0]->h;
+
+ 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);
+
+ ctx->inputs[1]->w = s->x[1] <= s->x[0] ? ctx->inputs[0]->w - s->x[0] :
s->x[1] - s->x[0];
+ ctx->inputs[1]->h = s->y[1] <= s->y[0] ? ctx->inputs[0]->h - s->y[0] :
s->y[1] - s->y[0];
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ FeedbackContext *s = ctx->priv;
+
+ ctx->outputs[0]->w = ctx->inputs[0]->w;
+ ctx->outputs[0]->h = ctx->inputs[0]->h;
+ ctx->outputs[1]->w = s->x[1] <= s->x[0] ? ctx->inputs[0]->w - s->x[0] :
s->x[1] - s->x[0];
+ ctx->outputs[1]->h = s->y[1] <= s->y[0] ? ctx->inputs[0]->h - s->y[0] :
s->y[1] - s->y[0];
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0,
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;
+
+ for (int i = 0; i < ctx->nb_outputs; i++)
+ FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[i], ctx);
+
+ if (!s->in[0]) {
+ ret = ff_inlink_consume_frame(ctx->inputs[0], &s->in[0]);
+ if (ret < 0)
+ return ret;
+
+ if (ret > 0) {
+ AVFrame *frame = av_frame_clone(s->in[0]);
+ if (!frame) {
+ av_frame_free(&s->in[0]);
+ return AVERROR(ENOMEM);
+ }
+
+ frame->width = s->x[1] <= s->x[0] ? frame->width - s->x[0] :
s->x[1] - s->x[0];
+ frame->height = s->y[1] <= s->y[0] ? frame->height - s->y[0] :
s->y[1] - s->y[0];
+
+ frame->data[0] += s->y[0] * frame->linesize[0];
+ frame->data[0] += s->x[0] * s->max_step[0];
+
+ for (int i = 1; i < 3; i ++) {
+ if (frame->data[i]) {
+ frame->data[i] += (s->y[0] >> s->vsub) *
frame->linesize[i];
+ frame->data[i] += (s->x[0] * s->max_step[i]) >> s->hsub;
+ }
+ }
+
+ if (frame->data[3]) {
+ frame->data[3] += s->y[0] * frame->linesize[3];
+ frame->data[3] += s->x[0] * s->max_step[3];
+ }
+
+ return ff_filter_frame(ctx->outputs[1], frame);
+ }
+ } else {
+ ret = ff_inlink_consume_frame(ctx->inputs[1], &s->in[1]);
+ if (ret < 0)
+ return ret;
+
+ if (ret > 0) {
+ AVFrame *dst = s->in[0];
+ AVFrame *src = s->in[1];
+
+ for (int y = 0; y < src->height; y++) {
+ memmove(dst->data[0] + (s->y[0] + y) * dst->linesize[0] +
s->x[0] * 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[0] + y) >> s->vsub) *
dst->linesize[i] + ((s->x[0] * s->max_step[i]) >> s->hsub),
+ src->data[i] + (y >> s->vsub) *
src->linesize[i], (src->width * s->max_step[i]) >> s->hsub);
+ }
+ }
+ }
+
+ if (dst->data[3]) {
+ for (int y = 0; y < src->height; y++) {
+ memmove(dst->data[3] + (s->y[0] + y) * dst->linesize[3] +
s->x[0] * s->max_step[3],
+ src->data[3] + y * src->linesize[3], src->width *
s->max_step[3]);
+ }
+ }
+
+ ret = ff_filter_frame(ctx->outputs[0], s->in[0]);
+ av_frame_free(&s->in[1]);
+ s->in[0] = NULL;
+ return ret;
+ }
+ }
+
+ 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->in[0])
+ FF_FILTER_FORWARD_WANTED(ctx->outputs[0], ctx->inputs[0]);
+ if (!s->in[1])
+ FF_FILTER_FORWARD_WANTED(ctx->outputs[0], ctx->inputs[1]);
+
+ return FFERROR_NOT_READY;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ FeedbackContext *s = ctx->priv;
+
+ av_frame_free(&s->in[0]);
+ av_frame_free(&s->in[1]);
+}
+
+static const AVFilterPad inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ },
+ {
+ .name = "feedinput",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ },
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ {
+ .name = "feedoutput",
+ .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)
+
+static const AVOption feedback_options[] = {
+ { "x0", "set x0 crop position", OFFSET(x[0]), AV_OPT_TYPE_INT, { .i64 = 0
}, 0, INT_MAX, FLAGS },
+ { "y0", "set y0 crop position", OFFSET(y[0]), AV_OPT_TYPE_INT, { .i64 = 0
}, 0, INT_MAX, FLAGS },
+ { "x1", "set x1 crop position", OFFSET(x[1]), AV_OPT_TYPE_INT, { .i64 = 0
}, 0, INT_MAX, FLAGS },
+ { "y1", "set y1 crop position", OFFSET(y[1]), 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,
+ .uninit = uninit,
+ FILTER_INPUTS(inputs),
+ FILTER_OUTPUTS(outputs),
+ FILTER_QUERY_FUNC(query_formats),
+ .flags = AVFILTER_FLAG_METADATA_ONLY,
+};
--
2.35.1
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