mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
3a9611d623
Signed-off-by: Paul B Mahol <onemda@gmail.com>
338 lines
10 KiB
C
338 lines
10 KiB
C
/*
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* Copyright (c) 2016 Floris Sluiter
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*
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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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* Pixel remap filter
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* This filter copies pixel by pixel a source frame to a target frame.
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* It remaps the pixels to a new x,y destination based on two files ymap/xmap.
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* Map files are passed as a parameter and are in PGM format (P2 or P5),
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* where the values are y(rows)/x(cols) coordinates of the source_frame.
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* The *target* frame dimension is based on mapfile dimensions: specified in the
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* header of the mapfile and reflected in the number of datavalues.
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* Dimensions of ymap and xmap must be equal. Datavalues must be positive or zero.
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* Any datavalue in the ymap or xmap which value is higher
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* then the *source* frame height or width is silently ignored, leaving a
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* blank/chromakey pixel. This can safely be used as a feature to create overlays.
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*
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* Algorithm digest:
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* Target_frame[y][x] = Source_frame[ ymap[y][x] ][ [xmap[y][x] ];
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*/
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#include "libavutil/imgutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "framesync.h"
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#include "internal.h"
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#include "video.h"
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typedef struct RemapContext {
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const AVClass *class;
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int nb_planes;
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int nb_components;
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int step;
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FFFrameSync fs;
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void (*remap)(struct RemapContext *s, const AVFrame *in,
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const AVFrame *xin, const AVFrame *yin,
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AVFrame *out);
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} RemapContext;
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#define OFFSET(x) offsetof(RemapContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption remap_options[] = {
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(remap);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUVA444P,
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AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
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AV_PIX_FMT_NONE
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};
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static const enum AVPixelFormat map_fmts[] = {
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AV_PIX_FMT_GRAY16,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *pix_formats = NULL, *map_formats = NULL;
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int ret;
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if (!(pix_formats = ff_make_format_list(pix_fmts)) ||
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!(map_formats = ff_make_format_list(map_fmts))) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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if ((ret = ff_formats_ref(pix_formats, &ctx->inputs[0]->out_formats)) < 0 ||
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(ret = ff_formats_ref(map_formats, &ctx->inputs[1]->out_formats)) < 0 ||
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(ret = ff_formats_ref(map_formats, &ctx->inputs[2]->out_formats)) < 0 ||
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(ret = ff_formats_ref(pix_formats, &ctx->outputs[0]->in_formats)) < 0)
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goto fail;
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return 0;
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fail:
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if (pix_formats)
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av_freep(&pix_formats->formats);
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av_freep(&pix_formats);
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if (map_formats)
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av_freep(&map_formats->formats);
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av_freep(&map_formats);
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return ret;
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}
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/**
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* remap_planar algorithm expects planes of same size
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* pixels are copied from source to target using :
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* Target_frame[y][x] = Source_frame[ ymap[y][x] ][ [xmap[y][x] ];
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*/
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static void remap_planar(RemapContext *s, const AVFrame *in,
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const AVFrame *xin, const AVFrame *yin,
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AVFrame *out)
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{
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const int xlinesize = xin->linesize[0] / 2;
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const int ylinesize = yin->linesize[0] / 2;
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int x , y, plane;
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for (plane = 0; plane < s->nb_planes ; plane++) {
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uint8_t *dst = out->data[plane];
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const int dlinesize = out->linesize[plane];
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const uint8_t *src = in->data[plane];
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const int slinesize = in->linesize[plane];
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const uint16_t *xmap = (const uint16_t *)xin->data[0];
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const uint16_t *ymap = (const uint16_t *)yin->data[0];
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for (y = 0; y < out->height; y++) {
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for (x = 0; x < out->width; x++) {
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if (ymap[x] < in->height && xmap[x] < in->width) {
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dst[x] = src[ymap[x] * slinesize + xmap[x]];
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} else {
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dst[x] = 0;
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}
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}
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dst += dlinesize;
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xmap += xlinesize;
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ymap += ylinesize;
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}
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}
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}
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/**
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* remap_packed algorithm expects pixels with both padded bits (step) and
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* number of components correctly set.
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* pixels are copied from source to target using :
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* Target_frame[y][x] = Source_frame[ ymap[y][x] ][ [xmap[y][x] ];
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*/
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static void remap_packed(RemapContext *s, const AVFrame *in,
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const AVFrame *xin, const AVFrame *yin,
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AVFrame *out)
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{
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uint8_t *dst = out->data[0];
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const uint8_t *src = in->data[0];
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const int dlinesize = out->linesize[0];
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const int slinesize = in->linesize[0];
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const int xlinesize = xin->linesize[0] / 2;
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const int ylinesize = yin->linesize[0] / 2;
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const uint16_t *xmap = (const uint16_t *)xin->data[0];
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const uint16_t *ymap = (const uint16_t *)yin->data[0];
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const int step = s->step;
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int c, x, y;
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for (y = 0; y < out->height; y++) {
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for (x = 0; x < out->width; x++) {
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for (c = 0; c < s->nb_components; c++) {
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if (ymap[x] < in->height && xmap[x] < in->width) {
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dst[x * step + c] = src[ymap[x] * slinesize + xmap[x] * step + c];
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} else {
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dst[x * step + c] = 0;
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}
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}
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}
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dst += dlinesize;
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xmap += xlinesize;
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ymap += ylinesize;
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}
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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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RemapContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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s->nb_components = desc->nb_components;
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if (s->nb_planes > 1 || s->nb_components == 1) {
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s->remap = remap_planar;
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} else {
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s->remap = remap_packed;
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}
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s->step = av_get_padded_bits_per_pixel(desc) >> 3;
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return 0;
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}
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static int process_frame(FFFrameSync *fs)
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{
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AVFilterContext *ctx = fs->parent;
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RemapContext *s = fs->opaque;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *out, *in, *xpic, *ypic;
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int ret;
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if ((ret = ff_framesync_get_frame(&s->fs, 0, &in, 0)) < 0 ||
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(ret = ff_framesync_get_frame(&s->fs, 1, &xpic, 0)) < 0 ||
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(ret = ff_framesync_get_frame(&s->fs, 2, &ypic, 0)) < 0)
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return ret;
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if (ctx->is_disabled) {
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out = av_frame_clone(in);
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if (!out)
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return AVERROR(ENOMEM);
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} else {
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out)
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return AVERROR(ENOMEM);
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av_frame_copy_props(out, in);
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s->remap(s, in, xpic, ypic, out);
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}
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out->pts = av_rescale_q(in->pts, s->fs.time_base, outlink->time_base);
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return ff_filter_frame(outlink, out);
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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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RemapContext *s = ctx->priv;
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AVFilterLink *srclink = ctx->inputs[0];
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AVFilterLink *xlink = ctx->inputs[1];
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AVFilterLink *ylink = ctx->inputs[2];
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FFFrameSyncIn *in;
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int ret;
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if (xlink->w != ylink->w || xlink->h != ylink->h) {
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av_log(ctx, AV_LOG_ERROR, "Second input link %s parameters "
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"(size %dx%d) do not match the corresponding "
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"third input link %s parameters (%dx%d)\n",
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ctx->input_pads[1].name, xlink->w, xlink->h,
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ctx->input_pads[2].name, ylink->w, ylink->h);
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return AVERROR(EINVAL);
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}
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outlink->w = xlink->w;
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outlink->h = xlink->h;
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outlink->time_base = srclink->time_base;
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outlink->sample_aspect_ratio = srclink->sample_aspect_ratio;
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outlink->frame_rate = srclink->frame_rate;
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ret = ff_framesync_init(&s->fs, ctx, 3);
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if (ret < 0)
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return ret;
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in = s->fs.in;
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in[0].time_base = srclink->time_base;
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in[1].time_base = xlink->time_base;
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in[2].time_base = ylink->time_base;
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in[0].sync = 2;
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in[0].before = EXT_STOP;
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in[0].after = EXT_STOP;
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in[1].sync = 1;
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in[1].before = EXT_NULL;
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in[1].after = EXT_INFINITY;
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in[2].sync = 1;
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in[2].before = EXT_NULL;
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in[2].after = EXT_INFINITY;
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s->fs.opaque = s;
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s->fs.on_event = process_frame;
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return ff_framesync_configure(&s->fs);
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
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{
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RemapContext *s = inlink->dst->priv;
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return ff_framesync_filter_frame(&s->fs, inlink, buf);
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}
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static int request_frame(AVFilterLink *outlink)
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{
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RemapContext *s = outlink->src->priv;
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return ff_framesync_request_frame(&s->fs, outlink);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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RemapContext *s = ctx->priv;
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ff_framesync_uninit(&s->fs);
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}
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static const AVFilterPad remap_inputs[] = {
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{
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.name = "source",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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{
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.name = "xmap",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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},
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{
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.name = "ymap",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad remap_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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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter ff_vf_remap = {
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.name = "remap",
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.description = NULL_IF_CONFIG_SMALL("Remap pixels"),
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.priv_size = sizeof(RemapContext),
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = remap_inputs,
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.outputs = remap_outputs,
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.priv_class = &remap_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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