Add pad filter.
Originally committed as revision 23046 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
26b7199e12
commit
3c940173c0
@ -19,6 +19,7 @@ OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
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OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o
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OBJS-$(CONFIG_NOFORMAT_FILTER) += vf_format.o
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OBJS-$(CONFIG_NULL_FILTER) += vf_null.o
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OBJS-$(CONFIG_PAD_FILTER) += vf_pad.o
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OBJS-$(CONFIG_PIXELASPECT_FILTER) += vf_aspect.o
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OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o
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OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
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@ -39,6 +39,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (FORMAT, format, vf);
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REGISTER_FILTER (NOFORMAT, noformat, vf);
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REGISTER_FILTER (NULL, null, vf);
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REGISTER_FILTER (PAD, pad, vf);
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REGISTER_FILTER (PIXELASPECT, pixelaspect, vf);
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REGISTER_FILTER (SCALE, scale, vf);
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REGISTER_FILTER (SLICIFY, slicify, vf);
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326
libavfilter/vf_pad.c
Normal file
326
libavfilter/vf_pad.c
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@ -0,0 +1,326 @@
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/*
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* copyright (c) 2008 vmrsss
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* copyright (c) 2009 Stefano Sabatini
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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 libavfilter/vf_pad.c
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* video padding filter
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*/
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#include "avfilter.h"
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#include "parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavcodec/colorspace.h"
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typedef struct {
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int w, h; ///< output dimensions, a value of 0 will result in the input size
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int x, y; ///< offsets of the input area with respect to the padded area
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int in_w, in_h; ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues
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uint8_t color[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area
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uint8_t *line[4];
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int line_step[4];
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int hsub, vsub; ///< chroma subsampling values
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} PadContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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PadContext *pad = ctx->priv;
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char color_string[128] = "black";
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if (args)
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sscanf(args, "%d:%d:%d:%d:%s", &pad->w, &pad->h, &pad->x, &pad->y, color_string);
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if (av_parse_color(pad->color, color_string, ctx) < 0)
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return -1;
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/* sanity check params */
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if (pad->w < 0 || pad->h < 0) {
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av_log(ctx, AV_LOG_ERROR, "Negative size values are not acceptable.\n");
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return -1;
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}
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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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PadContext *pad = ctx->priv;
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int i;
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for (i = 0; i < 4; i++) {
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av_freep(&pad->line[i]);
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pad->line_step[i] = 0;
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}
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum PixelFormat pix_fmts[] = {
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PIX_FMT_ARGB, PIX_FMT_RGBA,
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PIX_FMT_ABGR, PIX_FMT_BGRA,
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PIX_FMT_RGB24, PIX_FMT_BGR24,
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PIX_FMT_YUV444P, PIX_FMT_YUV422P,
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PIX_FMT_YUV420P, PIX_FMT_YUV411P,
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PIX_FMT_YUV410P, PIX_FMT_YUV440P,
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
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PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
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PIX_FMT_YUVA420P,
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PIX_FMT_NONE
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};
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avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
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return 0;
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}
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enum { RED = 0, GREEN, BLUE, ALPHA };
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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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PadContext *pad = ctx->priv;
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const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
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uint8_t rgba_color[4];
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uint8_t rgba_map[4];
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int i, is_packed_rgb = 1;
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switch (inlink->format) {
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case PIX_FMT_ARGB:
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rgba_map[ALPHA] = 0; rgba_map[RED] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE] = 3;
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break;
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case PIX_FMT_ABGR:
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rgba_map[ALPHA] = 0; rgba_map[BLUE] = 1; rgba_map[GREEN] = 2; rgba_map[RED] = 3;
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break;
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case PIX_FMT_RGBA:
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case PIX_FMT_RGB24:
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rgba_map[RED] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE] = 2; rgba_map[ALPHA] = 3;
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break;
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case PIX_FMT_BGRA:
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case PIX_FMT_BGR24:
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rgba_map[BLUE] = 0; rgba_map[GREEN] = 1; rgba_map[RED] = 2; rgba_map[ALPHA] = 3;
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break;
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default:
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is_packed_rgb = 0;
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}
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pad->hsub = pix_desc->log2_chroma_w;
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pad->vsub = pix_desc->log2_chroma_h;
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if (!pad->w)
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pad->w = inlink->w;
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if (!pad->h)
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pad->h = inlink->h;
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pad->w &= ~((1 << pad->hsub) - 1);
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pad->h &= ~((1 << pad->vsub) - 1);
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pad->x &= ~((1 << pad->hsub) - 1);
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pad->y &= ~((1 << pad->vsub) - 1);
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pad->in_w = inlink->w & ~((1 << pad->hsub) - 1);
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pad->in_h = inlink->h & ~((1 << pad->vsub) - 1);
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memcpy(rgba_color, pad->color, sizeof(rgba_color));
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if (is_packed_rgb) {
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pad->line_step[0] = (av_get_bits_per_pixel(&av_pix_fmt_descriptors[inlink->format]))>>3;
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for (i = 0; i < 4; i++)
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pad->color[rgba_map[i]] = rgba_color[i];
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pad->line[0] = av_malloc(pad->w * pad->line_step[0]);
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for (i = 0; i < pad->w; i++)
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memcpy(pad->line[0] + i * pad->line_step[0], pad->color, pad->line_step[0]);
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} else {
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int plane;
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pad->color[0] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
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pad->color[1] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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pad->color[2] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
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pad->color[3] = rgba_color[3];
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for (plane = 0; plane < 4; plane++) {
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int line_size;
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int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
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pad->line_step[plane] = 1;
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line_size = (pad->w >> hsub) * pad->line_step[plane];
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pad->line[plane] = av_malloc(line_size);
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memset(pad->line[plane], pad->color[plane], line_size);
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}
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}
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av_log(ctx, AV_LOG_INFO, "w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X[%s]\n",
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pad->w, pad->h, pad->x, pad->y,
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pad->color[0], pad->color[1], pad->color[2], pad->color[3],
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is_packed_rgb ? "rgba" : "yuva");
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if (pad->x < 0 || pad->y < 0 ||
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pad->w <= 0 || pad->h <= 0 ||
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(unsigned)pad->x + (unsigned)inlink->w > pad->w ||
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(unsigned)pad->y + (unsigned)inlink->h > pad->h) {
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av_log(ctx, AV_LOG_ERROR,
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"Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
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pad->x, pad->y, pad->x + inlink->w, pad->y + inlink->h, pad->w, pad->h);
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return -1;
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}
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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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PadContext *pad = outlink->src->priv;
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outlink->w = pad->w;
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outlink->h = pad->h;
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return 0;
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}
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static AVFilterPicRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
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{
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PadContext *pad = inlink->dst->priv;
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AVFilterPicRef *picref = avfilter_get_video_buffer(inlink->dst->outputs[0], perms,
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w + (pad->w - pad->in_w),
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h + (pad->h - pad->in_h));
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for (int plane = 0; plane < 4 && picref->data[plane]; plane++) {
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int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
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int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
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picref->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
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(pad->y >> vsub) * picref->linesize[plane];
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}
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return picref;
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}
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static void start_frame(AVFilterLink *inlink, AVFilterPicRef *inpicref)
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{
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PadContext *pad = inlink->dst->priv;
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AVFilterPicRef *outpicref = avfilter_ref_pic(inpicref, ~0);
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inlink->dst->outputs[0]->outpic = outpicref;
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for (int plane = 0; plane < 4 && outpicref->data[plane]; plane++) {
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int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
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int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
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outpicref->data[plane] -= (pad->x >> hsub) * pad->line_step[plane] +
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(pad->y >> vsub) * outpicref->linesize[plane];
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}
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avfilter_start_frame(inlink->dst->outputs[0], outpicref);
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}
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static void end_frame(AVFilterLink *link)
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{
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avfilter_end_frame(link->dst->outputs[0]);
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avfilter_unref_pic(link->cur_pic);
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}
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static void draw_rectangle(AVFilterPicRef *outpic, uint8_t *line[4], int line_step[4],
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int hsub, int vsub, int x, int y, int w, int h)
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{
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int i, plane;
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uint8_t *p;
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for (plane = 0; plane < 4 && outpic->data[plane]; plane++) {
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int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
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int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
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p = outpic->data[plane] + (y >> vsub1) * outpic->linesize[plane];
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for (i = 0; i < (h >> vsub1); i++) {
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memcpy(p + (x >> hsub1) * line_step[plane], line[plane], (w >> hsub1) * line_step[plane]);
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p += outpic->linesize[plane];
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}
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}
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}
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static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
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{
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PadContext *pad = link->dst->priv;
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int bar_y, bar_h = 0;
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if (slice_dir * before_slice == 1 && y == pad->y) {
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/* top bar */
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bar_y = 0;
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bar_h = pad->y;
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} else if (slice_dir * before_slice == -1 && (y + h) == (pad->y + pad->in_h)) {
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/* bottom bar */
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bar_y = pad->y + pad->in_h;
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bar_h = pad->h - pad->in_h - pad->y;
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}
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if (bar_h) {
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draw_rectangle(link->dst->outputs[0]->outpic,
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pad->line, pad->line_step, pad->hsub, pad->vsub,
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0, bar_y, pad->w, bar_h);
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avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
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}
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}
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static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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PadContext *pad = link->dst->priv;
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AVFilterPicRef *outpic = link->dst->outputs[0]->outpic;
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y += pad->y;
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y &= ~((1 << pad->vsub) - 1);
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h &= ~((1 << pad->vsub) - 1);
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if (!h)
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return;
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draw_send_bar_slice(link, y, h, slice_dir, 1);
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/* left border */
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draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
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0, y, pad->x, h);
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/* right border */
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draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
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pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
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avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
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draw_send_bar_slice(link, y, h, slice_dir, -1);
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}
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AVFilter avfilter_vf_pad = {
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.name = "pad",
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.description = "Add pads to the input image.",
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.priv_size = sizeof(PadContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.get_video_buffer = get_video_buffer,
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.start_frame = start_frame,
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.draw_slice = draw_slice,
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.end_frame = end_frame, },
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output, },
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{ .name = NULL}},
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};
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