| /* |
| * 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 |
| * video crop filter |
| */ |
| |
| /* #define DEBUG */ |
| |
| #include "avfilter.h" |
| #include "libavutil/eval.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/libm.h" |
| #include "libavutil/imgutils.h" |
| |
| static const char *var_names[] = { |
| "E", |
| "PHI", |
| "PI", |
| "in_w", "iw", ///< width of the input video |
| "in_h", "ih", ///< height of the input video |
| "out_w", "ow", ///< width of the cropped video |
| "out_h", "oh", ///< height of the cropped video |
| "x", |
| "y", |
| "n", ///< number of frame |
| "pos", ///< position in the file |
| "t", ///< timestamp expressed in seconds |
| NULL |
| }; |
| |
| enum var_name { |
| VAR_E, |
| VAR_PHI, |
| VAR_PI, |
| VAR_IN_W, VAR_IW, |
| VAR_IN_H, VAR_IH, |
| VAR_OUT_W, VAR_OW, |
| VAR_OUT_H, VAR_OH, |
| VAR_X, |
| VAR_Y, |
| VAR_N, |
| VAR_POS, |
| VAR_T, |
| VAR_VARS_NB |
| }; |
| |
| 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 max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes |
| int hsub, vsub; ///< chroma subsampling |
| char x_expr[256], y_expr[256], ow_expr[256], oh_expr[256]; |
| AVExpr *x_pexpr, *y_pexpr; /* parsed expressions for x and y */ |
| double var_values[VAR_VARS_NB]; |
| } CropContext; |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| static const enum PixelFormat pix_fmts[] = { |
| PIX_FMT_RGB48BE, PIX_FMT_RGB48LE, |
| PIX_FMT_BGR48BE, PIX_FMT_BGR48LE, |
| 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_RGB8, PIX_FMT_BGR8, |
| PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE, |
| PIX_FMT_PAL8, PIX_FMT_GRAY8, |
| PIX_FMT_NONE |
| }; |
| |
| avfilter_set_common_pixel_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; |
| |
| av_strlcpy(crop->ow_expr, "iw", sizeof(crop->ow_expr)); |
| av_strlcpy(crop->oh_expr, "ih", sizeof(crop->oh_expr)); |
| av_strlcpy(crop->x_expr, "(in_w-out_w)/2", sizeof(crop->x_expr)); |
| av_strlcpy(crop->y_expr, "(in_h-out_h)/2", sizeof(crop->y_expr)); |
| |
| if (args) |
| sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr); |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| CropContext *crop = ctx->priv; |
| |
| av_expr_free(crop->x_pexpr); crop->x_pexpr = NULL; |
| av_expr_free(crop->y_pexpr); crop->y_pexpr = NULL; |
| } |
| |
| static inline int normalize_double(int *n, double d) |
| { |
| int ret = 0; |
| |
| if (isnan(d)) { |
| ret = AVERROR(EINVAL); |
| } else if (d > INT_MAX || d < INT_MIN) { |
| *n = d > INT_MAX ? INT_MAX : INT_MIN; |
| ret = AVERROR(EINVAL); |
| } else |
| *n = round(d); |
| |
| return ret; |
| } |
| |
| static int config_input(AVFilterLink *link) |
| { |
| AVFilterContext *ctx = link->dst; |
| CropContext *crop = ctx->priv; |
| const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[link->format]; |
| int ret; |
| const char *expr; |
| double res; |
| |
| crop->var_values[VAR_E] = M_E; |
| crop->var_values[VAR_PHI] = M_PHI; |
| crop->var_values[VAR_PI] = M_PI; |
| crop->var_values[VAR_IN_W] = crop->var_values[VAR_IW] = ctx->inputs[0]->w; |
| crop->var_values[VAR_IN_H] = crop->var_values[VAR_IH] = ctx->inputs[0]->h; |
| crop->var_values[VAR_X] = NAN; |
| crop->var_values[VAR_Y] = NAN; |
| crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = NAN; |
| crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = NAN; |
| crop->var_values[VAR_N] = 0; |
| crop->var_values[VAR_T] = NAN; |
| crop->var_values[VAR_POS] = NAN; |
| |
| av_image_fill_max_pixsteps(crop->max_step, NULL, pix_desc); |
| crop->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w; |
| crop->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h; |
| |
| if ((ret = av_expr_parse_and_eval(&res, (expr = crop->ow_expr), |
| var_names, crop->var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr; |
| crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res; |
| if ((ret = av_expr_parse_and_eval(&res, (expr = crop->oh_expr), |
| var_names, crop->var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr; |
| crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = res; |
| /* evaluate again ow as it may depend on oh */ |
| if ((ret = av_expr_parse_and_eval(&res, (expr = crop->ow_expr), |
| var_names, crop->var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr; |
| crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res; |
| if (normalize_double(&crop->w, crop->var_values[VAR_OUT_W]) < 0 || |
| normalize_double(&crop->h, crop->var_values[VAR_OUT_H]) < 0) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Too big value or invalid expression for out_w/ow or out_h/oh. " |
| "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n", |
| crop->ow_expr, crop->oh_expr); |
| return AVERROR(EINVAL); |
| } |
| crop->w &= ~((1 << crop->hsub) - 1); |
| crop->h &= ~((1 << crop->vsub) - 1); |
| |
| if ((ret = av_expr_parse(&crop->x_pexpr, crop->x_expr, var_names, |
| NULL, NULL, NULL, NULL, 0, ctx)) < 0 || |
| (ret = av_expr_parse(&crop->y_pexpr, crop->y_expr, var_names, |
| NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| return AVERROR(EINVAL); |
| |
| av_log(ctx, AV_LOG_INFO, "w:%d h:%d -> w:%d h:%d\n", |
| link->w, link->h, crop->w, crop->h); |
| |
| if (crop->w <= 0 || crop->h <= 0 || |
| crop->w > link->w || crop->h > link->h) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Invalid too big or non positive size for width '%d' or height '%d'\n", |
| crop->w, crop->h); |
| return AVERROR(EINVAL); |
| } |
| |
| /* set default, required in the case the first computed value for x/y is NAN */ |
| crop->x = (link->w - crop->w) / 2; |
| crop->y = (link->h - crop->h) / 2; |
| crop->x &= ~((1 << crop->hsub) - 1); |
| crop->y &= ~((1 << crop->vsub) - 1); |
| return 0; |
| |
| fail_expr: |
| av_log(NULL, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", expr); |
| return ret; |
| } |
| |
| static int config_output(AVFilterLink *link) |
| { |
| CropContext *crop = link->src->priv; |
| |
| link->w = crop->w; |
| link->h = crop->h; |
| |
| return 0; |
| } |
| |
| static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref) |
| { |
| AVFilterContext *ctx = link->dst; |
| CropContext *crop = ctx->priv; |
| AVFilterBufferRef *ref2; |
| int i; |
| |
| ref2 = avfilter_ref_buffer(picref, ~0); |
| ref2->video->w = crop->w; |
| ref2->video->h = crop->h; |
| |
| crop->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ? |
| NAN : picref->pts * av_q2d(link->time_base); |
| crop->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos; |
| crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL); |
| crop->var_values[VAR_Y] = av_expr_eval(crop->y_pexpr, crop->var_values, NULL); |
| crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL); |
| |
| normalize_double(&crop->x, crop->var_values[VAR_X]); |
| normalize_double(&crop->y, crop->var_values[VAR_Y]); |
| |
| if (crop->x < 0) crop->x = 0; |
| if (crop->y < 0) crop->y = 0; |
| if ((unsigned)crop->x + (unsigned)crop->w > link->w) crop->x = link->w - crop->w; |
| if ((unsigned)crop->y + (unsigned)crop->h > link->h) crop->y = link->h - crop->h; |
| crop->x &= ~((1 << crop->hsub) - 1); |
| crop->y &= ~((1 << crop->vsub) - 1); |
| |
| av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n", |
| (int)crop->var_values[VAR_N], crop->var_values[VAR_T], crop->x, |
| crop->y, crop->x+crop->w, crop->y+crop->h); |
| |
| ref2->data[0] += crop->y * ref2->linesize[0]; |
| ref2->data[0] += crop->x * crop->max_step[0]; |
| |
| if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) { |
| 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->max_step[i]) >> crop->hsub; |
| } |
| } |
| } |
| |
| /* alpha plane */ |
| if (ref2->data[3]) { |
| ref2->data[3] += crop->y * ref2->linesize[3]; |
| ref2->data[3] += crop->x * crop->max_step[3]; |
| } |
| |
| avfilter_start_frame(link->dst->outputs[0], ref2); |
| } |
| |
| static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir) |
| { |
| 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, slice_dir); |
| } |
| |
| static void end_frame(AVFilterLink *link) |
| { |
| CropContext *crop = link->dst->priv; |
| |
| crop->var_values[VAR_N] += 1.0; |
| avfilter_unref_buffer(link->cur_buf); |
| avfilter_end_frame(link->dst->outputs[0]); |
| } |
| |
| AVFilter avfilter_vf_crop = { |
| .name = "crop", |
| .description = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."), |
| |
| .priv_size = sizeof(CropContext), |
| |
| .query_formats = query_formats, |
| .init = init, |
| .uninit = uninit, |
| |
| .inputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .start_frame = start_frame, |
| .draw_slice = draw_slice, |
| .end_frame = end_frame, |
| .get_video_buffer = avfilter_null_get_video_buffer, |
| .config_props = config_input, }, |
| { .name = NULL}}, |
| .outputs = (AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, }, |
| { .name = NULL}}, |
| }; |
