mirror of
https://github.com/FFmpeg/FFmpeg.git
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201 lines
6.6 KiB
C
201 lines
6.6 KiB
C
/*
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* copyright (c) 2007 Bobby Bingham
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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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* video crop filter
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*/
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#include "avfilter.h"
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#include "libavutil/pixdesc.h"
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typedef struct {
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int x; ///< x offset of the non-cropped area with respect to the input area
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int y; ///< y offset of the non-cropped area with respect to the input area
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int w; ///< width of the cropped area
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int h; ///< height of the cropped area
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int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
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int hsub, vsub; ///< chroma subsampling
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} CropContext;
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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_RGB48BE, PIX_FMT_RGB48LE,
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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_RGB565BE, PIX_FMT_RGB565LE,
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PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
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PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
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PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
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PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
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PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
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PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
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PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
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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_RGB8, PIX_FMT_BGR8,
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PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
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PIX_FMT_PAL8, PIX_FMT_GRAY8,
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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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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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CropContext *crop = ctx->priv;
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if (args)
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sscanf(args, "%d:%d:%d:%d", &crop->x, &crop->y, &crop->w, &crop->h);
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return 0;
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}
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static int config_input(AVFilterLink *link)
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{
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AVFilterContext *ctx = link->dst;
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CropContext *crop = ctx->priv;
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const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[link->format];
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int i;
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memset(crop->max_step, 0, sizeof(crop->max_step));
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for (i = 0; i < 4; i++) {
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const AVComponentDescriptor *comp = &(pix_desc->comp[i]);
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if ((comp->step_minus1+1) > crop->max_step[comp->plane])
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crop->max_step[comp->plane] = comp->step_minus1+1;
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}
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crop->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
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crop->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
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if (crop->w == 0)
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crop->w = link->w - crop->x;
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if (crop->h == 0)
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crop->h = link->h - crop->y;
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crop->x &= ~((1 << crop->hsub) - 1);
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crop->y &= ~((1 << crop->vsub) - 1);
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av_log(link->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d\n",
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crop->x, crop->y, crop->w, crop->h);
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if (crop->x < 0 || crop->y < 0 ||
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crop->w <= 0 || crop->h <= 0 ||
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(unsigned)crop->x + (unsigned)crop->w > link->w ||
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(unsigned)crop->y + (unsigned)crop->h > link->h) {
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av_log(ctx, AV_LOG_ERROR,
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"Output area %d:%d:%d:%d not within the input area 0:0:%d:%d or zero-sized\n",
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crop->x, crop->y, crop->w, crop->h, link->w, link->h);
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int config_output(AVFilterLink *link)
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{
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CropContext *crop = link->src->priv;
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link->w = crop->w;
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link->h = crop->h;
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return 0;
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}
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static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
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{
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CropContext *crop = link->dst->priv;
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AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0);
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int i;
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ref2->w = crop->w;
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ref2->h = crop->h;
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ref2->data[0] += crop->y * ref2->linesize[0];
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ref2->data[0] += (crop->x * crop->max_step[0]);
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if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) {
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for (i = 1; i < 3; i ++) {
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if (ref2->data[i]) {
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ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
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ref2->data[i] += (crop->x * crop->max_step[i]) >> crop->hsub;
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}
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}
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}
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/* alpha plane */
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if (ref2->data[3]) {
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ref2->data[3] += crop->y * ref2->linesize[3];
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ref2->data[3] += (crop->x * crop->max_step[3]);
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}
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avfilter_start_frame(link->dst->outputs[0], ref2);
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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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AVFilterContext *ctx = link->dst;
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CropContext *crop = ctx->priv;
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if (y >= crop->y + crop->h || y + h <= crop->y)
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return;
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if (y < crop->y) {
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h -= crop->y - y;
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y = crop->y;
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}
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if (y + h > crop->y + crop->h)
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h = crop->y + crop->h - y;
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avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
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}
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AVFilter avfilter_vf_crop = {
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.name = "crop",
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.description = NULL_IF_CONFIG_SMALL("Crop the input video to x:y:width:height."),
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.priv_size = sizeof(CropContext),
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.query_formats = query_formats,
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.init = init,
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.start_frame = start_frame,
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.draw_slice = draw_slice,
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.get_video_buffer = avfilter_null_get_video_buffer,
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.config_props = config_input, },
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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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