| /* |
| * Copyright (c) 2008 vmrsss |
| * Copyright (c) 2009 Stefano Sabatini |
| * |
| * 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 padding filter |
| */ |
| |
| #include "avfilter.h" |
| #include "formats.h" |
| #include "internal.h" |
| #include "video.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/common.h" |
| #include "libavutil/eval.h" |
| #include "libavutil/pixdesc.h" |
| #include "libavutil/colorspace.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/imgutils.h" |
| #include "libavutil/parseutils.h" |
| #include "libavutil/mathematics.h" |
| #include "drawutils.h" |
| |
| static const char *const var_names[] = { |
| "in_w", "iw", |
| "in_h", "ih", |
| "out_w", "ow", |
| "out_h", "oh", |
| "x", |
| "y", |
| "a", |
| "sar", |
| "dar", |
| "hsub", |
| "vsub", |
| NULL |
| }; |
| |
| enum var_name { |
| 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_A, |
| VAR_SAR, |
| VAR_DAR, |
| VAR_HSUB, |
| VAR_VSUB, |
| VARS_NB |
| }; |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0)); |
| return 0; |
| } |
| |
| typedef struct { |
| int w, h; ///< output dimensions, a value of 0 will result in the input size |
| int x, y; ///< offsets of the input area with respect to the padded area |
| 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 |
| |
| char w_expr[256]; ///< width expression string |
| char h_expr[256]; ///< height expression string |
| char x_expr[256]; ///< width expression string |
| char y_expr[256]; ///< height expression string |
| |
| uint8_t rgba_color[4]; ///< color for the padding area |
| FFDrawContext draw; |
| FFDrawColor color; |
| } PadContext; |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args) |
| { |
| PadContext *pad = ctx->priv; |
| char color_string[128] = "black"; |
| |
| av_strlcpy(pad->w_expr, "iw", sizeof(pad->w_expr)); |
| av_strlcpy(pad->h_expr, "ih", sizeof(pad->h_expr)); |
| av_strlcpy(pad->x_expr, "0" , sizeof(pad->w_expr)); |
| av_strlcpy(pad->y_expr, "0" , sizeof(pad->h_expr)); |
| |
| if (args) |
| sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]:%127s", |
| pad->w_expr, pad->h_expr, pad->x_expr, pad->y_expr, color_string); |
| |
| if (av_parse_color(pad->rgba_color, color_string, -1, ctx) < 0) |
| return AVERROR(EINVAL); |
| |
| return 0; |
| } |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| PadContext *pad = ctx->priv; |
| int ret; |
| double var_values[VARS_NB], res; |
| char *expr; |
| |
| ff_draw_init(&pad->draw, inlink->format, 0); |
| ff_draw_color(&pad->draw, &pad->color, pad->rgba_color); |
| |
| var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w; |
| var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h; |
| var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN; |
| var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN; |
| var_values[VAR_A] = (double) inlink->w / inlink->h; |
| var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? |
| (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1; |
| var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR]; |
| var_values[VAR_HSUB] = 1 << pad->draw.hsub_max; |
| var_values[VAR_VSUB] = 1 << pad->draw.vsub_max; |
| |
| /* evaluate width and height */ |
| av_expr_parse_and_eval(&res, (expr = pad->w_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx); |
| pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res; |
| if ((ret = av_expr_parse_and_eval(&res, (expr = pad->h_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto eval_fail; |
| pad->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res; |
| /* evaluate the width again, as it may depend on the evaluated output height */ |
| if ((ret = av_expr_parse_and_eval(&res, (expr = pad->w_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto eval_fail; |
| pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res; |
| |
| /* evaluate x and y */ |
| av_expr_parse_and_eval(&res, (expr = pad->x_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx); |
| pad->x = var_values[VAR_X] = res; |
| if ((ret = av_expr_parse_and_eval(&res, (expr = pad->y_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto eval_fail; |
| pad->y = var_values[VAR_Y] = res; |
| /* evaluate x again, as it may depend on the evaluated y value */ |
| if ((ret = av_expr_parse_and_eval(&res, (expr = pad->x_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto eval_fail; |
| pad->x = var_values[VAR_X] = res; |
| |
| /* sanity check params */ |
| if (pad->w < 0 || pad->h < 0 || pad->x < 0 || pad->y < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| if (!pad->w) |
| pad->w = inlink->w; |
| if (!pad->h) |
| pad->h = inlink->h; |
| |
| pad->w = ff_draw_round_to_sub(&pad->draw, 0, -1, pad->w); |
| pad->h = ff_draw_round_to_sub(&pad->draw, 1, -1, pad->h); |
| pad->x = ff_draw_round_to_sub(&pad->draw, 0, -1, pad->x); |
| pad->y = ff_draw_round_to_sub(&pad->draw, 1, -1, pad->y); |
| pad->in_w = ff_draw_round_to_sub(&pad->draw, 0, -1, inlink->w); |
| pad->in_h = ff_draw_round_to_sub(&pad->draw, 1, -1, inlink->h); |
| |
| av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X\n", |
| inlink->w, inlink->h, pad->w, pad->h, pad->x, pad->y, |
| pad->rgba_color[0], pad->rgba_color[1], pad->rgba_color[2], pad->rgba_color[3]); |
| |
| if (pad->x < 0 || pad->y < 0 || |
| pad->w <= 0 || pad->h <= 0 || |
| (unsigned)pad->x + (unsigned)inlink->w > pad->w || |
| (unsigned)pad->y + (unsigned)inlink->h > pad->h) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n", |
| pad->x, pad->y, pad->x + inlink->w, pad->y + inlink->h, pad->w, pad->h); |
| return AVERROR(EINVAL); |
| } |
| |
| return 0; |
| |
| eval_fail: |
| av_log(NULL, AV_LOG_ERROR, |
| "Error when evaluating the expression '%s'\n", expr); |
| return ret; |
| |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| PadContext *pad = outlink->src->priv; |
| |
| outlink->w = pad->w; |
| outlink->h = pad->h; |
| return 0; |
| } |
| |
| static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h) |
| { |
| PadContext *pad = inlink->dst->priv; |
| int align = (perms&AV_PERM_ALIGN) ? AVFILTER_ALIGN : 1; |
| |
| AVFilterBufferRef *picref = ff_get_video_buffer(inlink->dst->outputs[0], perms, |
| w + (pad->w - pad->in_w) + 4*align, |
| h + (pad->h - pad->in_h)); |
| int plane; |
| |
| if (!picref) |
| return NULL; |
| |
| picref->video->w = w; |
| picref->video->h = h; |
| |
| for (plane = 0; plane < 4 && picref->data[plane]; plane++) |
| picref->data[plane] += FFALIGN(pad->x >> pad->draw.hsub[plane], align) * pad->draw.pixelstep[plane] + |
| (pad->y >> pad->draw.vsub[plane]) * picref->linesize[plane]; |
| |
| return picref; |
| } |
| |
| static int does_clip(PadContext *pad, AVFilterBufferRef *outpicref, int plane, int hsub, int vsub, int x, int y) |
| { |
| int64_t x_in_buf, y_in_buf; |
| |
| x_in_buf = outpicref->data[plane] - outpicref->buf->data[plane] |
| + (x >> hsub) * pad->draw.pixelstep[plane] |
| + (y >> vsub) * outpicref->linesize[plane]; |
| |
| if(x_in_buf < 0 || x_in_buf % pad->draw.pixelstep[plane]) |
| return 1; |
| x_in_buf /= pad->draw.pixelstep[plane]; |
| |
| av_assert0(outpicref->buf->linesize[plane]>0); //while reference can use negative linesize the main buffer should not |
| |
| y_in_buf = x_in_buf / outpicref->buf->linesize[plane]; |
| x_in_buf %= outpicref->buf->linesize[plane]; |
| |
| if( y_in_buf<<vsub >= outpicref->buf->h |
| || x_in_buf<<hsub >= outpicref->buf->w) |
| return 1; |
| return 0; |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in) |
| { |
| PadContext *pad = inlink->dst->priv; |
| AVFilterBufferRef *out = avfilter_ref_buffer(in, ~0); |
| int plane, needs_copy; |
| |
| if (!out) { |
| avfilter_unref_bufferp(&in); |
| return AVERROR(ENOMEM); |
| } |
| |
| for (plane = 0; plane < 4 && out->data[plane] && pad->draw.pixelstep[plane]; plane++) { |
| int hsub = pad->draw.hsub[plane]; |
| int vsub = pad->draw.vsub[plane]; |
| |
| av_assert0(out->buf->w > 0 && out->buf->h > 0); |
| |
| if (out->format != out->buf->format) //unsupported currently |
| break; |
| |
| out->data[plane] -= (pad->x >> hsub) * pad->draw.pixelstep[plane] + |
| (pad->y >> vsub) * out->linesize[plane]; |
| |
| if (does_clip(pad, out, plane, hsub, vsub, 0, 0) || |
| does_clip(pad, out, plane, hsub, vsub, 0, pad->h - 1) || |
| does_clip(pad, out, plane, hsub, vsub, pad->w - 1, 0) || |
| does_clip(pad, out, plane, hsub, vsub, pad->w - 1, pad->h - 1)) |
| break; |
| } |
| needs_copy = plane < 4 && out->data[plane] || !(out->perms & AV_PERM_WRITE); |
| if (needs_copy) { |
| av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n"); |
| avfilter_unref_buffer(out); |
| out = ff_get_video_buffer(inlink->dst->outputs[0], AV_PERM_WRITE | AV_PERM_NEG_LINESIZES, |
| FFMAX(inlink->w, pad->w), |
| FFMAX(inlink->h, pad->h)); |
| if (!out) { |
| avfilter_unref_bufferp(&in); |
| return AVERROR(ENOMEM); |
| } |
| |
| avfilter_copy_buffer_ref_props(out, in); |
| } |
| |
| out->video->w = pad->w; |
| out->video->h = pad->h; |
| |
| /* top bar */ |
| if (pad->y) { |
| ff_fill_rectangle(&pad->draw, &pad->color, |
| out->data, out->linesize, |
| 0, 0, pad->w, pad->y); |
| } |
| |
| /* bottom bar */ |
| if (pad->h > pad->y + pad->in_h) { |
| ff_fill_rectangle(&pad->draw, &pad->color, |
| out->data, out->linesize, |
| 0, pad->y + pad->in_h, pad->w, pad->h - pad->y - pad->in_h); |
| } |
| |
| /* left border */ |
| ff_fill_rectangle(&pad->draw, &pad->color, out->data, out->linesize, |
| 0, pad->y, pad->x, in->video->h); |
| |
| if (needs_copy) { |
| ff_copy_rectangle2(&pad->draw, |
| out->data, out->linesize, in->data, in->linesize, |
| pad->x, pad->y, 0, 0, in->video->w, in->video->h); |
| } |
| |
| /* right border */ |
| ff_fill_rectangle(&pad->draw, &pad->color, out->data, out->linesize, |
| pad->x + pad->in_w, pad->y, pad->w - pad->x - pad->in_w, |
| in->video->h); |
| |
| avfilter_unref_bufferp(&in); |
| return ff_filter_frame(inlink->dst->outputs[0], out); |
| } |
| |
| static const AVFilterPad avfilter_vf_pad_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_input, |
| .get_video_buffer = get_video_buffer, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad avfilter_vf_pad_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter avfilter_vf_pad = { |
| .name = "pad", |
| .description = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."), |
| |
| .priv_size = sizeof(PadContext), |
| .init = init, |
| .query_formats = query_formats, |
| |
| .inputs = avfilter_vf_pad_inputs, |
| |
| .outputs = avfilter_vf_pad_outputs, |
| }; |