From d5f187fd3355ec6d4922d8479930c10d1b6f9ebf Mon Sep 17 00:00:00 2001 From: Nolan L Date: Sun, 12 Dec 2010 17:59:10 +0000 Subject: Add gradfun filter, ported from MPlayer. Patch by Nolan L nol888 <=> gmail >=< com. See thread: Subject: [FFmpeg-devel] [PATCH] Port gradfun to libavfilter (GCI) Date: Mon, 29 Nov 2010 07:18:14 -0500 Originally committed as revision 25942 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavfilter/vf_gradfun.c | 253 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 253 insertions(+) create mode 100644 libavfilter/vf_gradfun.c (limited to 'libavfilter/vf_gradfun.c') diff --git a/libavfilter/vf_gradfun.c b/libavfilter/vf_gradfun.c new file mode 100644 index 0000000000..1cbf8d8c2a --- /dev/null +++ b/libavfilter/vf_gradfun.c @@ -0,0 +1,253 @@ +/* + * Copyright (c) 2010 Nolan Lum + * Copyright (c) 2009 Loren Merritt + * + * 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 + * gradfun debanding filter, ported from MPlayer + * libmpcodecs/vf_gradfun.c + * + * Apply a boxblur debanding algorithm (based on the gradfun2db + * Avisynth filter by prunedtree). + * Foreach pixel, if it's within threshold of the blurred value, make it closer. + * So now we have a smoothed and higher bitdepth version of all the shallow + * gradients, while leaving detailed areas untouched. + * Dither it back to 8bit. + */ + +#include "libavcore/imgutils.h" +#include "libavutil/cpu.h" +#include "libavutil/pixdesc.h" +#include "avfilter.h" +#include "gradfun.h" + +DECLARE_ALIGNED(16, static const uint16_t, dither)[8][8] = { + {0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E}, + {0x40,0x20,0x58,0x38,0x46,0x26,0x5E,0x3E}, + {0x10,0x70,0x08,0x68,0x16,0x76,0x0E,0x6E}, + {0x50,0x30,0x48,0x28,0x56,0x36,0x4E,0x2E}, + {0x04,0x64,0x1C,0x7C,0x02,0x62,0x1A,0x7A}, + {0x44,0x24,0x5C,0x3C,0x42,0x22,0x5A,0x3A}, + {0x14,0x74,0x0C,0x6C,0x12,0x72,0x0A,0x6A}, + {0x54,0x34,0x4C,0x2C,0x52,0x32,0x4A,0x2A}, +}; + +void ff_gradfun_filter_line_c(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers) +{ + int x; + for (x = 0; x < width; x++, dc += x & 1) { + int pix = src[x] << 7; + int delta = dc[0] - pix; + int m = abs(delta) * thresh >> 16; + m = FFMAX(0, 127 - m); + m = m * m * delta >> 14; + pix += m + dithers[x & 7]; + dst[x] = av_clip_uint8(pix >> 7); + } +} + +void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width) +{ + int x, v, old; + for (x = 0; x < width; x++) { + v = buf1[x] + src[2 * x] + src[2 * x + 1] + src[2 * x + src_linesize] + src[2 * x + 1 + src_linesize]; + old = buf[x]; + buf[x] = v; + dc[x] = v - old; + } +} + +static void filter(GradFunContext *ctx, uint8_t *dst, uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r) +{ + int bstride = FFALIGN(width, 16) / 2; + int y; + uint32_t dc_factor = (1 << 21) / (r * r); + uint16_t *dc = ctx->buf + 16; + uint16_t *buf = ctx->buf + bstride + 32; + int thresh = ctx->thresh; + + memset(dc, 0, (bstride + 16) * sizeof(*buf)); + for (y = 0; y < r; y++) + ctx->blur_line(dc, buf + y * bstride, buf + (y - 1) * bstride, src + 2 * y * src_linesize, src_linesize, width / 2); + for (;;) { + if (y < height - r) { + int mod = ((y + r) / 2) % r; + uint16_t *buf0 = buf + mod * bstride; + uint16_t *buf1 = buf + (mod ? mod - 1 : r - 1) * bstride; + int x, v; + ctx->blur_line(dc, buf0, buf1, src + (y + r) * src_linesize, src_linesize, width / 2); + for (x = v = 0; x < r; x++) + v += dc[x]; + for (; x < width / 2; x++) { + v += dc[x] - dc[x-r]; + dc[x-r] = v * dc_factor >> 16; + } + for (; x < (width + r + 1) / 2; x++) + dc[x-r] = v * dc_factor >> 16; + for (x = -r / 2; x < 0; x++) + dc[x] = dc[0]; + } + if (y == r) { + for (y = 0; y < r; y++) + ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); + } + ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); + if (++y >= height) break; + ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]); + if (++y >= height) break; + } +} + +static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) +{ + GradFunContext *gf = ctx->priv; + float thresh = 1.2; + int radius = 16; + av_unused int cpu_flags = av_get_cpu_flags(); + + if (args) + sscanf(args, "%f:%d", &thresh, &radius); + + thresh = av_clipf(thresh, 0.51, 255); + gf->thresh = (1 << 15) / thresh; + gf->radius = av_clip((radius + 1) & ~1, 4, 32); + + gf->blur_line = ff_gradfun_blur_line_c; + gf->filter_line = ff_gradfun_filter_line_c; + + if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX2) + gf->filter_line = ff_gradfun_filter_line_mmx2; + if (HAVE_SSSE3 && cpu_flags & AV_CPU_FLAG_SSSE3) + gf->filter_line = ff_gradfun_filter_line_ssse3; + if (HAVE_SSE && cpu_flags & AV_CPU_FLAG_SSE2) + gf->blur_line = ff_gradfun_blur_line_sse2; + + av_log(ctx, AV_LOG_INFO, "threshold:%.2f radius:%d\n", thresh, gf->radius); + + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + GradFunContext *gf = ctx->priv; + av_freep(&gf->buf); +} + +static int query_formats(AVFilterContext *ctx) +{ + static const enum PixelFormat pix_fmts[] = { + PIX_FMT_YUV410P, PIX_FMT_YUV420P, + PIX_FMT_GRAY8, PIX_FMT_NV12, + PIX_FMT_NV21, PIX_FMT_YUV444P, + PIX_FMT_YUV422P, PIX_FMT_YUV411P, + PIX_FMT_NONE + }; + + avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); + + return 0; +} + +static int config_input(AVFilterLink *inlink) +{ + GradFunContext *gf = inlink->dst->priv; + int hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w; + int vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h; + + gf->buf = av_mallocz((FFALIGN(inlink->w, 16) * (gf->radius + 1) / 2 + 32) * sizeof(uint16_t)); + if (!gf->buf) + return AVERROR(ENOMEM); + + gf->chroma_w = -((-inlink->w) >> hsub); + gf->chroma_h = -((-inlink->h) >> vsub); + gf->chroma_r = av_clip(((((gf->radius >> hsub) + (gf->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32); + + return 0; +} + +static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref) +{ + AVFilterLink *outlink = inlink->dst->outputs[0]; + AVFilterBufferRef *outpicref; + + if (inpicref->perms & AV_PERM_PRESERVE) { + outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); + avfilter_copy_buffer_ref_props(outpicref, inpicref); + outpicref->video->w = outlink->w; + outpicref->video->h = outlink->h; + } else + outpicref = inpicref; + + outlink->out_buf = outpicref; + avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0)); +} + +static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { } + +static void end_frame(AVFilterLink *inlink) +{ + GradFunContext *gf = inlink->dst->priv; + AVFilterBufferRef *inpic = inlink->cur_buf; + AVFilterLink *outlink = inlink->dst->outputs[0]; + AVFilterBufferRef *outpic = outlink->out_buf; + int p; + + for (p = 0; p < 4 && inpic->data[p]; p++) { + int w = inlink->w; + int h = inlink->h; + int r = gf->radius; + if (p) { + w = gf->chroma_w; + h = gf->chroma_h; + r = gf->chroma_r; + } + + if (FFMIN(w, h) > 2 * r) + filter(gf, outpic->data[p], inpic->data[p], w, h, outpic->linesize[p], inpic->linesize[p], r); + else if (outpic->data[p] != inpic->data[p]) + av_image_copy_plane(outpic->data[p], outpic->linesize[p], inpic->data[p], inpic->linesize[p], w, h); + } + + avfilter_draw_slice(outlink, 0, inlink->h, 1); + avfilter_end_frame(outlink); + avfilter_unref_buffer(inpic); + avfilter_unref_buffer(outpic); +} + +AVFilter avfilter_vf_gradfun = { + .name = "gradfun", + .description = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."), + .priv_size = sizeof(GradFunContext), + .init = init, + .uninit = uninit, + .query_formats = query_formats, + + .inputs = (AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_input, + .start_frame = start_frame, + .draw_slice = null_draw_slice, + .end_frame = end_frame, + .min_perms = AV_PERM_READ, }, + { .name = NULL}}, + .outputs = (AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_VIDEO, }, + { .name = NULL}}, +}; -- cgit v1.2.3