From 190c166960b88f1b27932e1f274dd494862e8449 Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Wed, 21 Oct 2009 20:57:30 +0000 Subject: [PATCH] Add video crop filter. Originally committed as revision 20342 to svn://svn.ffmpeg.org/ffmpeg/trunk --- doc/libavfilter.texi | 31 ++++++ libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/vf_crop.c | 233 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 266 insertions(+) create mode 100644 libavfilter/vf_crop.c diff --git a/doc/libavfilter.texi b/doc/libavfilter.texi index f8189f1c38..7253abfa0f 100644 --- a/doc/libavfilter.texi +++ b/doc/libavfilter.texi @@ -84,4 +84,35 @@ Below is a description of the currently available video filters. Pass the source unchanged to the output. +@section crop + +Crop the input video to x:y:width:height. + +@example +./ffmpeg -i in.avi -vfilters "crop=0:0:0:240" out.avi +@end example + +``x'' and ``y'' specify the position of the top-left corner of the +output (non-cropped) area. + +The default value of ``x'' and ``y'' is 0. + +The ``w'' and ``h'' parameters specify the width and height of the +output (non-cropped) area. + +A value of 0 is interpreted as the maximum possible size contained in +the area delimited by the top-left corner at position x:y. + +For example the parameters: + +@example +"crop=100:100:0:0" +@end example + +will delimit the rectangle with the top-left corner placed at position +100:100 and the right-bottom corner corresponding to the right-bottom +corner of the input image. + +The default value of ``w'' and ``h'' is 0. + @bye diff --git a/libavfilter/Makefile b/libavfilter/Makefile index e79eb47da4..c5bf2bbb9c 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -11,6 +11,7 @@ OBJS = allfilters.o \ defaults.o \ formats.o \ +OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o OBJS-$(CONFIG_NULL_FILTER) += vf_null.o include $(SUBDIR)../subdir.mak diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index f8188852bb..1104f610a8 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -34,5 +34,6 @@ void avfilter_register_all(void) return; initialized = 1; + REGISTER_FILTER (CROP,crop,vf); REGISTER_FILTER (NULL,null,vf); } diff --git a/libavfilter/vf_crop.c b/libavfilter/vf_crop.c new file mode 100644 index 0000000000..6b1592836e --- /dev/null +++ b/libavfilter/vf_crop.c @@ -0,0 +1,233 @@ +/* + * copyright (c) 2007 Bobby Bingham + * + * 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 libavfilter/vf_crop.c + * video crop filter + */ + +#include "avfilter.h" + +typedef struct { + int x; ///< x offset of the non-cropped area with respect to the input area + int y; ///< y offset of the non-cropped area with respect to the input area + int w; ///< width of the cropped area + int h; ///< height of the cropped area + + int bpp; ///< bits per pixel + int hsub, vsub; ///< chroma subsampling +} CropContext; + +static int query_formats(AVFilterContext *ctx) +{ + enum PixelFormat pix_fmts[] = { + PIX_FMT_RGB48BE, PIX_FMT_RGB48LE, + PIX_FMT_ARGB, PIX_FMT_RGBA, + PIX_FMT_ABGR, PIX_FMT_BGRA, + PIX_FMT_RGB24, PIX_FMT_BGR24, + PIX_FMT_RGB565BE, PIX_FMT_RGB565LE, + PIX_FMT_RGB555BE, PIX_FMT_RGB555LE, + PIX_FMT_BGR565BE, PIX_FMT_BGR565LE, + PIX_FMT_BGR555BE, PIX_FMT_BGR555LE, + PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE, + PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE, + PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE, + PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE, + PIX_FMT_YUV444P, PIX_FMT_YUV422P, + PIX_FMT_YUV420P, PIX_FMT_YUV411P, + PIX_FMT_YUV410P, PIX_FMT_YUV440P, + PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, + PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P, + PIX_FMT_YUVA420P, + PIX_FMT_NV12, PIX_FMT_NV21, + PIX_FMT_YUYV422, PIX_FMT_UYVY422, + PIX_FMT_UYYVYY411, + PIX_FMT_RGB8, PIX_FMT_BGR8, + PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE, + PIX_FMT_PAL8, PIX_FMT_GRAY8, + PIX_FMT_NONE + }; + + avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); + + return 0; +} + +static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) +{ + CropContext *crop = ctx->priv; + + if (args) + sscanf(args, "%d:%d:%d:%d", &crop->x, &crop->y, &crop->w, &crop->h); + + return 0; +} + +static int config_input(AVFilterLink *link) +{ + AVFilterContext *ctx = link->dst; + CropContext *crop = ctx->priv; + + switch (link->format) { + case PIX_FMT_RGB48BE: + case PIX_FMT_RGB48LE: + crop->bpp = 48; + break; + case PIX_FMT_ARGB: + case PIX_FMT_RGBA: + case PIX_FMT_ABGR: + case PIX_FMT_BGRA: + crop->bpp = 32; + break; + case PIX_FMT_RGB24: + case PIX_FMT_BGR24: + crop->bpp = 24; + break; + case PIX_FMT_RGB565BE: + case PIX_FMT_RGB565LE: + case PIX_FMT_RGB555BE: + case PIX_FMT_RGB555LE: + case PIX_FMT_BGR565BE: + case PIX_FMT_BGR565LE: + case PIX_FMT_BGR555BE: + case PIX_FMT_BGR555LE: + case PIX_FMT_GRAY16BE: + case PIX_FMT_GRAY16LE: + case PIX_FMT_YUV420P16LE: + case PIX_FMT_YUV420P16BE: + case PIX_FMT_YUV422P16LE: + case PIX_FMT_YUV422P16BE: + case PIX_FMT_YUV444P16LE: + case PIX_FMT_YUV444P16BE: + crop->bpp = 16; + break; + default: + crop->bpp = 8; + } + + avcodec_get_chroma_sub_sample(link->format, &crop->hsub, &crop->vsub); + + if (crop->w == 0) + crop->w = link->w - crop->x; + if (crop->h == 0) + crop->h = link->h - crop->y; + + crop->x &= ~((1 << crop->hsub) - 1); + crop->y &= ~((1 << crop->vsub) - 1); + + av_log(link->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d\n", + crop->x, crop->y, crop->w, crop->h); + + if (crop->x < 0 || crop->y < 0 || + crop->w <= 0 || crop->h <= 0 || + (unsigned)crop->x + (unsigned)crop->w > link->w || + (unsigned)crop->y + (unsigned)crop->h > link->h) { + av_log(ctx, AV_LOG_ERROR, + "Output area %d:%d:%d:%d not within the input area 0:0:%d:%d or zero-sized\n", + crop->x, crop->y, crop->w, crop->h, link->w, link->h); + return -1; + } + + return 0; +} + +static int config_output(AVFilterLink *link) +{ + CropContext *crop = link->src->priv; + + link->w = crop->w; + link->h = crop->h; + + return 0; +} + +static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms, + int w, int h) +{ + return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h); +} + +static void start_frame(AVFilterLink *link, AVFilterPicRef *picref) +{ + CropContext *crop = link->dst->priv; + AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0); + int i; + + ref2->w = crop->w; + ref2->h = crop->h; + + ref2->data[0] += crop->y * ref2->linesize[0]; + ref2->data[0] += (crop->x * crop->bpp) >> 3; + + if (link->format != PIX_FMT_PAL8) { + for (i = 1; i < 3; i ++) { + if (ref2->data[i]) { + ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i]; + ref2->data[i] += crop->x >> crop->hsub; + } + } + } + + /* alpha plane */ + if (ref2->data[3]) { + ref2->data[3] += crop->y * ref2->linesize[3]; + ref2->data[3] += (crop->x * crop->bpp) >> 3; + } + + avfilter_start_frame(link->dst->outputs[0], ref2); +} + +static void draw_slice(AVFilterLink *link, int y, int h) +{ + AVFilterContext *ctx = link->dst; + CropContext *crop = ctx->priv; + + if (y >= crop->y + crop->h || y + h <= crop->y) + return; + + if (y < crop->y) { + h -= crop->y - y; + y = crop->y; + } + if (y + h > crop->y + crop->h) + h = crop->y + crop->h - y; + + avfilter_draw_slice(ctx->outputs[0], y - crop->y, h); +} + +AVFilter avfilter_vf_crop = { + .name = "crop", + .priv_size = sizeof(CropContext), + + .query_formats = query_formats, + .init = init, + + .inputs = (AVFilterPad[]) {{ .name = "default", + .type = CODEC_TYPE_VIDEO, + .start_frame = start_frame, + .draw_slice = draw_slice, + .get_video_buffer = get_video_buffer, + .config_props = config_input, }, + { .name = NULL}}, + .outputs = (AVFilterPad[]) {{ .name = "default", + .type = CODEC_TYPE_VIDEO, + .config_props = config_output, }, + { .name = NULL}}, +}; -- GitLab