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