| /* |
| * 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 "libavutil/opt.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) |
| { |
| return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0)); |
| } |
| |
| typedef struct PadContext { |
| const AVClass *class; |
| 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; ///< width expression string |
| char *h_expr; ///< height expression string |
| char *x_expr; ///< width expression string |
| char *y_expr; ///< height expression string |
| uint8_t rgba_color[4]; ///< color for the padding area |
| FFDrawContext draw; |
| FFDrawColor color; |
| } PadContext; |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| PadContext *s = ctx->priv; |
| int ret; |
| double var_values[VARS_NB], res; |
| char *expr; |
| |
| ff_draw_init(&s->draw, inlink->format, 0); |
| ff_draw_color(&s->draw, &s->color, s->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 << s->draw.hsub_max; |
| var_values[VAR_VSUB] = 1 << s->draw.vsub_max; |
| |
| /* evaluate width and height */ |
| av_expr_parse_and_eval(&res, (expr = s->w_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx); |
| s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res; |
| if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto eval_fail; |
| s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res; |
| if (!s->h) |
| var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h = inlink->h; |
| |
| /* evaluate the width again, as it may depend on the evaluated output height */ |
| if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto eval_fail; |
| s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res; |
| if (!s->w) |
| var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w = inlink->w; |
| |
| /* evaluate x and y */ |
| av_expr_parse_and_eval(&res, (expr = s->x_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx); |
| s->x = var_values[VAR_X] = res; |
| if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto eval_fail; |
| s->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 = s->x_expr), |
| var_names, var_values, |
| NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| goto eval_fail; |
| s->x = var_values[VAR_X] = res; |
| |
| /* sanity check params */ |
| if (s->w < 0 || s->h < 0 || s->x < 0 || s->y < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| s->w = ff_draw_round_to_sub(&s->draw, 0, -1, s->w); |
| s->h = ff_draw_round_to_sub(&s->draw, 1, -1, s->h); |
| s->x = ff_draw_round_to_sub(&s->draw, 0, -1, s->x); |
| s->y = ff_draw_round_to_sub(&s->draw, 1, -1, s->y); |
| s->in_w = ff_draw_round_to_sub(&s->draw, 0, -1, inlink->w); |
| s->in_h = ff_draw_round_to_sub(&s->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, s->w, s->h, s->x, s->y, |
| s->rgba_color[0], s->rgba_color[1], s->rgba_color[2], s->rgba_color[3]); |
| |
| if (s->x < 0 || s->y < 0 || |
| s->w <= 0 || s->h <= 0 || |
| (unsigned)s->x + (unsigned)inlink->w > s->w || |
| (unsigned)s->y + (unsigned)inlink->h > s->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", |
| s->x, s->y, s->x + inlink->w, s->y + inlink->h, s->w, s->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 *s = outlink->src->priv; |
| |
| outlink->w = s->w; |
| outlink->h = s->h; |
| return 0; |
| } |
| |
| static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h) |
| { |
| PadContext *s = inlink->dst->priv; |
| |
| AVFrame *frame = ff_get_video_buffer(inlink->dst->outputs[0], |
| w + (s->w - s->in_w), |
| h + (s->h - s->in_h) + (s->x > 0)); |
| int plane; |
| |
| if (!frame) |
| return NULL; |
| |
| frame->width = w; |
| frame->height = h; |
| |
| for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) { |
| int hsub = s->draw.hsub[plane]; |
| int vsub = s->draw.vsub[plane]; |
| frame->data[plane] += (s->x >> hsub) * s->draw.pixelstep[plane] + |
| (s->y >> vsub) * frame->linesize[plane]; |
| } |
| |
| return frame; |
| } |
| |
| /* check whether each plane in this buffer can be padded without copying */ |
| static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf) |
| { |
| int planes[4] = { -1, -1, -1, -1}, *p = planes; |
| int i, j; |
| |
| /* get all planes in this buffer */ |
| for (i = 0; i < FF_ARRAY_ELEMS(planes) && frame->data[i]; i++) { |
| if (av_frame_get_plane_buffer(frame, i) == buf) |
| *p++ = i; |
| } |
| |
| /* for each plane in this buffer, check that it can be padded without |
| * going over buffer bounds or other planes */ |
| for (i = 0; i < FF_ARRAY_ELEMS(planes) && planes[i] >= 0; i++) { |
| int hsub = s->draw.hsub[planes[i]]; |
| int vsub = s->draw.vsub[planes[i]]; |
| |
| uint8_t *start = frame->data[planes[i]]; |
| uint8_t *end = start + (frame->height >> vsub) * |
| frame->linesize[planes[i]]; |
| |
| /* amount of free space needed before the start and after the end |
| * of the plane */ |
| ptrdiff_t req_start = (s->x >> hsub) * s->draw.pixelstep[planes[i]] + |
| (s->y >> vsub) * frame->linesize[planes[i]]; |
| ptrdiff_t req_end = ((s->w - s->x - frame->width) >> hsub) * |
| s->draw.pixelstep[planes[i]] + |
| ((s->h - s->y - frame->height) >> vsub) * frame->linesize[planes[i]]; |
| |
| if (frame->linesize[planes[i]] < (s->w >> hsub) * s->draw.pixelstep[planes[i]]) |
| return 1; |
| if (start - buf->data < req_start || |
| (buf->data + buf->size) - end < req_end) |
| return 1; |
| |
| for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) { |
| int vsub1 = s->draw.vsub[planes[j]]; |
| uint8_t *start1 = frame->data[planes[j]]; |
| uint8_t *end1 = start1 + (frame->height >> vsub1) * |
| frame->linesize[planes[j]]; |
| if (i == j) |
| continue; |
| |
| if (FFSIGN(start - end1) != FFSIGN(start - end1 - req_start) || |
| FFSIGN(end - start1) != FFSIGN(end - start1 + req_end)) |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int frame_needs_copy(PadContext *s, AVFrame *frame) |
| { |
| int i; |
| |
| if (!av_frame_is_writable(frame)) |
| return 1; |
| |
| for (i = 0; i < 4 && frame->buf[i]; i++) |
| if (buffer_needs_copy(s, frame, frame->buf[i])) |
| return 1; |
| return 0; |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| { |
| PadContext *s = inlink->dst->priv; |
| AVFrame *out; |
| int needs_copy = frame_needs_copy(s, in); |
| |
| if (needs_copy) { |
| av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n"); |
| out = ff_get_video_buffer(inlink->dst->outputs[0], |
| FFMAX(inlink->w, s->w), |
| FFMAX(inlink->h, s->h)); |
| if (!out) { |
| av_frame_free(&in); |
| return AVERROR(ENOMEM); |
| } |
| |
| av_frame_copy_props(out, in); |
| } else { |
| int i; |
| |
| out = in; |
| for (i = 0; i < 4 && out->data[i] && out->linesize[i]; i++) { |
| int hsub = s->draw.hsub[i]; |
| int vsub = s->draw.vsub[i]; |
| out->data[i] -= (s->x >> hsub) * s->draw.pixelstep[i] + |
| (s->y >> vsub) * out->linesize[i]; |
| } |
| } |
| |
| /* top bar */ |
| if (s->y) { |
| ff_fill_rectangle(&s->draw, &s->color, |
| out->data, out->linesize, |
| 0, 0, s->w, s->y); |
| } |
| |
| /* bottom bar */ |
| if (s->h > s->y + s->in_h) { |
| ff_fill_rectangle(&s->draw, &s->color, |
| out->data, out->linesize, |
| 0, s->y + s->in_h, s->w, s->h - s->y - s->in_h); |
| } |
| |
| /* left border */ |
| ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize, |
| 0, s->y, s->x, in->height); |
| |
| if (needs_copy) { |
| ff_copy_rectangle2(&s->draw, |
| out->data, out->linesize, in->data, in->linesize, |
| s->x, s->y, 0, 0, in->width, in->height); |
| } |
| |
| /* right border */ |
| ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize, |
| s->x + s->in_w, s->y, s->w - s->x - s->in_w, |
| in->height); |
| |
| out->width = s->w; |
| out->height = s->h; |
| |
| if (in != out) |
| av_frame_free(&in); |
| return ff_filter_frame(inlink->dst->outputs[0], out); |
| } |
| |
| #define OFFSET(x) offsetof(PadContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption pad_options[] = { |
| { "width", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "w", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "height", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "h", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "x", "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "y", "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "color", "set the color of the padded area border", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(pad); |
| |
| 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 ff_vf_pad = { |
| .name = "pad", |
| .description = NULL_IF_CONFIG_SMALL("Pad the input video."), |
| .priv_size = sizeof(PadContext), |
| .priv_class = &pad_class, |
| .query_formats = query_formats, |
| .inputs = avfilter_vf_pad_inputs, |
| .outputs = avfilter_vf_pad_outputs, |
| }; |