| /* |
| * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> |
| * Copyright (c) 2011 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 General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU 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 |
| * Apply a boxblur filter to the input video. |
| * Ported from MPlayer libmpcodecs/vf_boxblur.c. |
| */ |
| |
| #include "libavutil/avstring.h" |
| #include "libavutil/common.h" |
| #include "libavutil/opt.h" |
| #include "avfilter.h" |
| #include "formats.h" |
| #include "internal.h" |
| #include "video.h" |
| #include "boxblur.h" |
| |
| |
| typedef struct BoxBlurContext { |
| const AVClass *class; |
| FilterParam luma_param; |
| FilterParam chroma_param; |
| FilterParam alpha_param; |
| |
| int hsub, vsub; |
| int radius[4]; |
| int power[4]; |
| uint8_t *temp[2]; ///< temporary buffer used in blur_power() |
| } BoxBlurContext; |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| BoxBlurContext *s = ctx->priv; |
| |
| av_freep(&s->temp[0]); |
| av_freep(&s->temp[1]); |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats = NULL; |
| int fmt, ret; |
| |
| for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) { |
| const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); |
| if (!(desc->flags & (AV_PIX_FMT_FLAG_HWACCEL | AV_PIX_FMT_FLAG_BITSTREAM | AV_PIX_FMT_FLAG_PAL)) && |
| (desc->flags & AV_PIX_FMT_FLAG_PLANAR || desc->nb_components == 1) && |
| (!(desc->flags & AV_PIX_FMT_FLAG_BE) == !HAVE_BIGENDIAN || desc->comp[0].depth == 8) && |
| (ret = ff_add_format(&formats, fmt)) < 0) |
| return ret; |
| } |
| |
| return ff_set_common_formats(ctx, formats); |
| } |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| AVFilterContext *ctx = inlink->dst; |
| BoxBlurContext *s = ctx->priv; |
| int w = inlink->w, h = inlink->h; |
| int ret; |
| |
| if (!(s->temp[0] = av_malloc(2*FFMAX(w, h))) || |
| !(s->temp[1] = av_malloc(2*FFMAX(w, h)))) |
| return AVERROR(ENOMEM); |
| |
| s->hsub = desc->log2_chroma_w; |
| s->vsub = desc->log2_chroma_h; |
| |
| ret = ff_boxblur_eval_filter_params(inlink, |
| &s->luma_param, |
| &s->chroma_param, |
| &s->alpha_param); |
| |
| if (ret != 0) { |
| av_log(ctx, AV_LOG_ERROR, "Failed to evaluate " |
| "filter params: %d.\n", ret); |
| return ret; |
| } |
| |
| s->radius[Y] = s->luma_param.radius; |
| s->radius[U] = s->radius[V] = s->chroma_param.radius; |
| s->radius[A] = s->alpha_param.radius; |
| |
| s->power[Y] = s->luma_param.power; |
| s->power[U] = s->power[V] = s->chroma_param.power; |
| s->power[A] = s->alpha_param.power; |
| |
| return 0; |
| } |
| |
| /* Naive boxblur would sum source pixels from x-radius .. x+radius |
| * for destination pixel x. That would be O(radius*width). |
| * If you now look at what source pixels represent 2 consecutive |
| * output pixels, then you see they are almost identical and only |
| * differ by 2 pixels, like: |
| * src0 111111111 |
| * dst0 1 |
| * src1 111111111 |
| * dst1 1 |
| * src0-src1 1 -1 |
| * so when you know one output pixel you can find the next by just adding |
| * and subtracting 1 input pixel. |
| * The following code adopts this faster variant. |
| */ |
| #define BLUR(type, depth) \ |
| static inline void blur ## depth(type *dst, int dst_step, const type *src, \ |
| int src_step, int len, int radius) \ |
| { \ |
| const int length = radius*2 + 1; \ |
| const int inv = ((1<<16) + length/2)/length; \ |
| int x, sum = src[radius*src_step]; \ |
| \ |
| for (x = 0; x < radius; x++) \ |
| sum += src[x*src_step]<<1; \ |
| \ |
| sum = sum*inv + (1<<15); \ |
| \ |
| for (x = 0; x <= radius; x++) { \ |
| sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv; \ |
| dst[x*dst_step] = sum>>16; \ |
| } \ |
| \ |
| for (; x < len-radius; x++) { \ |
| sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv; \ |
| dst[x*dst_step] = sum >>16; \ |
| } \ |
| \ |
| for (; x < len; x++) { \ |
| sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv; \ |
| dst[x*dst_step] = sum>>16; \ |
| } \ |
| } |
| |
| BLUR(uint8_t, 8) |
| BLUR(uint16_t, 16) |
| |
| #undef BLUR |
| |
| static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, |
| int len, int radius, int pixsize) |
| { |
| if (pixsize == 1) blur8 (dst, dst_step , src, src_step , len, radius); |
| else blur16((uint16_t*)dst, dst_step>>1, (const uint16_t*)src, src_step>>1, len, radius); |
| } |
| |
| static inline void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step, |
| int len, int radius, int power, uint8_t *temp[2], int pixsize) |
| { |
| uint8_t *a = temp[0], *b = temp[1]; |
| |
| if (radius && power) { |
| blur(a, pixsize, src, src_step, len, radius, pixsize); |
| for (; power > 2; power--) { |
| uint8_t *c; |
| blur(b, pixsize, a, pixsize, len, radius, pixsize); |
| c = a; a = b; b = c; |
| } |
| if (power > 1) { |
| blur(dst, dst_step, a, pixsize, len, radius, pixsize); |
| } else { |
| int i; |
| if (pixsize == 1) { |
| for (i = 0; i < len; i++) |
| dst[i*dst_step] = a[i]; |
| } else |
| for (i = 0; i < len; i++) |
| *(uint16_t*)(dst + i*dst_step) = ((uint16_t*)a)[i]; |
| } |
| } else { |
| int i; |
| if (pixsize == 1) { |
| for (i = 0; i < len; i++) |
| dst[i*dst_step] = src[i*src_step]; |
| } else |
| for (i = 0; i < len; i++) |
| *(uint16_t*)(dst + i*dst_step) = *(uint16_t*)(src + i*src_step); |
| } |
| } |
| |
| static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, |
| int w, int h, int radius, int power, uint8_t *temp[2], int pixsize) |
| { |
| int y; |
| |
| if (radius == 0 && dst == src) |
| return; |
| |
| for (y = 0; y < h; y++) |
| blur_power(dst + y*dst_linesize, pixsize, src + y*src_linesize, pixsize, |
| w, radius, power, temp, pixsize); |
| } |
| |
| static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, |
| int w, int h, int radius, int power, uint8_t *temp[2], int pixsize) |
| { |
| int x; |
| |
| if (radius == 0 && dst == src) |
| return; |
| |
| for (x = 0; x < w; x++) |
| blur_power(dst + x*pixsize, dst_linesize, src + x*pixsize, src_linesize, |
| h, radius, power, temp, pixsize); |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| BoxBlurContext *s = ctx->priv; |
| AVFilterLink *outlink = inlink->dst->outputs[0]; |
| AVFrame *out; |
| int plane; |
| int cw = AV_CEIL_RSHIFT(inlink->w, s->hsub), ch = AV_CEIL_RSHIFT(in->height, s->vsub); |
| int w[4] = { inlink->w, cw, cw, inlink->w }; |
| int h[4] = { in->height, ch, ch, in->height }; |
| const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| const int depth = desc->comp[0].depth; |
| const int pixsize = (depth+7)/8; |
| |
| out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| if (!out) { |
| av_frame_free(&in); |
| return AVERROR(ENOMEM); |
| } |
| av_frame_copy_props(out, in); |
| |
| for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) |
| hblur(out->data[plane], out->linesize[plane], |
| in ->data[plane], in ->linesize[plane], |
| w[plane], h[plane], s->radius[plane], s->power[plane], |
| s->temp, pixsize); |
| |
| for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) |
| vblur(out->data[plane], out->linesize[plane], |
| out->data[plane], out->linesize[plane], |
| w[plane], h[plane], s->radius[plane], s->power[plane], |
| s->temp, pixsize); |
| |
| av_frame_free(&in); |
| |
| return ff_filter_frame(outlink, out); |
| } |
| |
| #define OFFSET(x) offsetof(BoxBlurContext, x) |
| #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| |
| static const AVOption boxblur_options[] = { |
| { "luma_radius", "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS }, |
| { "lr", "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS }, |
| { "luma_power", "How many times should the boxblur be applied to luma", OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS }, |
| { "lp", "How many times should the boxblur be applied to luma", OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS }, |
| |
| { "chroma_radius", "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS }, |
| { "cr", "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS }, |
| { "chroma_power", "How many times should the boxblur be applied to chroma", OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS }, |
| { "cp", "How many times should the boxblur be applied to chroma", OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS }, |
| |
| { "alpha_radius", "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS }, |
| { "ar", "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS }, |
| { "alpha_power", "How many times should the boxblur be applied to alpha", OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS }, |
| { "ap", "How many times should the boxblur be applied to alpha", OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS }, |
| |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(boxblur); |
| |
| static const AVFilterPad avfilter_vf_boxblur_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_input, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad avfilter_vf_boxblur_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_vf_boxblur = { |
| .name = "boxblur", |
| .description = NULL_IF_CONFIG_SMALL("Blur the input."), |
| .priv_size = sizeof(BoxBlurContext), |
| .priv_class = &boxblur_class, |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .inputs = avfilter_vf_boxblur_inputs, |
| .outputs = avfilter_vf_boxblur_outputs, |
| .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| }; |
