vf_gradfun.c 9.0 KB

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  1. /*
  2. * Copyright (c) 2010 Nolan Lum <nol888@gmail.com>
  3. * Copyright (c) 2009 Loren Merritt <lorenm@u.washignton.edu>
  4. *
  5. * This file is part of FFmpeg.
  6. *
  7. * FFmpeg is free software; you can redistribute it and/or
  8. * modify it under the terms of the GNU Lesser General Public
  9. * License as published by the Free Software Foundation; either
  10. * version 2.1 of the License, or (at your option) any later version.
  11. *
  12. * FFmpeg is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15. * Lesser General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU Lesser General Public
  18. * License along with FFmpeg; if not, write to the Free Software
  19. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20. */
  21. /**
  22. * @file
  23. * gradfun debanding filter, ported from MPlayer
  24. * libmpcodecs/vf_gradfun.c
  25. *
  26. * Apply a boxblur debanding algorithm (based on the gradfun2db
  27. * Avisynth filter by prunedtree).
  28. * Foreach pixel, if it's within threshold of the blurred value, make it closer.
  29. * So now we have a smoothed and higher bitdepth version of all the shallow
  30. * gradients, while leaving detailed areas untouched.
  31. * Dither it back to 8bit.
  32. */
  33. #include "libavutil/imgutils.h"
  34. #include "libavutil/cpu.h"
  35. #include "libavutil/pixdesc.h"
  36. #include "avfilter.h"
  37. #include "gradfun.h"
  38. DECLARE_ALIGNED(16, static const uint16_t, dither)[8][8] = {
  39. {0x00,0x60,0x18,0x78,0x06,0x66,0x1E,0x7E},
  40. {0x40,0x20,0x58,0x38,0x46,0x26,0x5E,0x3E},
  41. {0x10,0x70,0x08,0x68,0x16,0x76,0x0E,0x6E},
  42. {0x50,0x30,0x48,0x28,0x56,0x36,0x4E,0x2E},
  43. {0x04,0x64,0x1C,0x7C,0x02,0x62,0x1A,0x7A},
  44. {0x44,0x24,0x5C,0x3C,0x42,0x22,0x5A,0x3A},
  45. {0x14,0x74,0x0C,0x6C,0x12,0x72,0x0A,0x6A},
  46. {0x54,0x34,0x4C,0x2C,0x52,0x32,0x4A,0x2A},
  47. };
  48. void ff_gradfun_filter_line_c(uint8_t *dst, const uint8_t *src, const uint16_t *dc, int width, int thresh, const uint16_t *dithers)
  49. {
  50. int x;
  51. for (x = 0; x < width; x++, dc += x & 1) {
  52. int pix = src[x] << 7;
  53. int delta = dc[0] - pix;
  54. int m = abs(delta) * thresh >> 16;
  55. m = FFMAX(0, 127 - m);
  56. m = m * m * delta >> 14;
  57. pix += m + dithers[x & 7];
  58. dst[x] = av_clip_uint8(pix >> 7);
  59. }
  60. }
  61. void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, const uint16_t *buf1, const uint8_t *src, int src_linesize, int width)
  62. {
  63. int x, v, old;
  64. for (x = 0; x < width; x++) {
  65. v = buf1[x] + src[2 * x] + src[2 * x + 1] + src[2 * x + src_linesize] + src[2 * x + 1 + src_linesize];
  66. old = buf[x];
  67. buf[x] = v;
  68. dc[x] = v - old;
  69. }
  70. }
  71. static void filter(GradFunContext *ctx, uint8_t *dst, const uint8_t *src, int width, int height, int dst_linesize, int src_linesize, int r)
  72. {
  73. int bstride = FFALIGN(width, 16) / 2;
  74. int y;
  75. uint32_t dc_factor = (1 << 21) / (r * r);
  76. uint16_t *dc = ctx->buf + 16;
  77. uint16_t *buf = ctx->buf + bstride + 32;
  78. int thresh = ctx->thresh;
  79. memset(dc, 0, (bstride + 16) * sizeof(*buf));
  80. for (y = 0; y < r; y++)
  81. ctx->blur_line(dc, buf + y * bstride, buf + (y - 1) * bstride, src + 2 * y * src_linesize, src_linesize, width / 2);
  82. for (;;) {
  83. if (y < height - r) {
  84. int mod = ((y + r) / 2) % r;
  85. uint16_t *buf0 = buf + mod * bstride;
  86. uint16_t *buf1 = buf + (mod ? mod - 1 : r - 1) * bstride;
  87. int x, v;
  88. ctx->blur_line(dc, buf0, buf1, src + (y + r) * src_linesize, src_linesize, width / 2);
  89. for (x = v = 0; x < r; x++)
  90. v += dc[x];
  91. for (; x < width / 2; x++) {
  92. v += dc[x] - dc[x-r];
  93. dc[x-r] = v * dc_factor >> 16;
  94. }
  95. for (; x < (width + r + 1) / 2; x++)
  96. dc[x-r] = v * dc_factor >> 16;
  97. for (x = -r / 2; x < 0; x++)
  98. dc[x] = dc[0];
  99. }
  100. if (y == r) {
  101. for (y = 0; y < r; y++)
  102. ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
  103. }
  104. ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
  105. if (++y >= height) break;
  106. ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
  107. if (++y >= height) break;
  108. }
  109. emms_c();
  110. }
  111. static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
  112. {
  113. GradFunContext *gf = ctx->priv;
  114. float thresh = 1.2;
  115. int radius = 16;
  116. av_unused int cpu_flags = av_get_cpu_flags();
  117. if (args)
  118. sscanf(args, "%f:%d", &thresh, &radius);
  119. thresh = av_clipf(thresh, 0.51, 255);
  120. gf->thresh = (1 << 15) / thresh;
  121. gf->radius = av_clip((radius + 1) & ~1, 4, 32);
  122. gf->blur_line = ff_gradfun_blur_line_c;
  123. gf->filter_line = ff_gradfun_filter_line_c;
  124. if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX2)
  125. gf->filter_line = ff_gradfun_filter_line_mmx2;
  126. if (HAVE_SSSE3 && cpu_flags & AV_CPU_FLAG_SSSE3)
  127. gf->filter_line = ff_gradfun_filter_line_ssse3;
  128. if (HAVE_SSE && cpu_flags & AV_CPU_FLAG_SSE2)
  129. gf->blur_line = ff_gradfun_blur_line_sse2;
  130. av_log(ctx, AV_LOG_INFO, "threshold:%.2f radius:%d\n", thresh, gf->radius);
  131. return 0;
  132. }
  133. static av_cold void uninit(AVFilterContext *ctx)
  134. {
  135. GradFunContext *gf = ctx->priv;
  136. av_freep(&gf->buf);
  137. }
  138. static int query_formats(AVFilterContext *ctx)
  139. {
  140. static const enum PixelFormat pix_fmts[] = {
  141. PIX_FMT_YUV410P, PIX_FMT_YUV420P,
  142. PIX_FMT_GRAY8, PIX_FMT_NV12,
  143. PIX_FMT_NV21, PIX_FMT_YUV444P,
  144. PIX_FMT_YUV422P, PIX_FMT_YUV411P,
  145. PIX_FMT_NONE
  146. };
  147. avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
  148. return 0;
  149. }
  150. static int config_input(AVFilterLink *inlink)
  151. {
  152. GradFunContext *gf = inlink->dst->priv;
  153. int hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
  154. int vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
  155. gf->buf = av_mallocz((FFALIGN(inlink->w, 16) * (gf->radius + 1) / 2 + 32) * sizeof(uint16_t));
  156. if (!gf->buf)
  157. return AVERROR(ENOMEM);
  158. gf->chroma_w = -((-inlink->w) >> hsub);
  159. gf->chroma_h = -((-inlink->h) >> vsub);
  160. gf->chroma_r = av_clip(((((gf->radius >> hsub) + (gf->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32);
  161. return 0;
  162. }
  163. static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
  164. {
  165. AVFilterLink *outlink = inlink->dst->outputs[0];
  166. AVFilterBufferRef *outpicref;
  167. if (inpicref->perms & AV_PERM_PRESERVE) {
  168. outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
  169. avfilter_copy_buffer_ref_props(outpicref, inpicref);
  170. outpicref->video->w = outlink->w;
  171. outpicref->video->h = outlink->h;
  172. } else
  173. outpicref = inpicref;
  174. outlink->out_buf = outpicref;
  175. avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
  176. }
  177. static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
  178. static void end_frame(AVFilterLink *inlink)
  179. {
  180. GradFunContext *gf = inlink->dst->priv;
  181. AVFilterBufferRef *inpic = inlink->cur_buf;
  182. AVFilterLink *outlink = inlink->dst->outputs[0];
  183. AVFilterBufferRef *outpic = outlink->out_buf;
  184. int p;
  185. for (p = 0; p < 4 && inpic->data[p]; p++) {
  186. int w = inlink->w;
  187. int h = inlink->h;
  188. int r = gf->radius;
  189. if (p) {
  190. w = gf->chroma_w;
  191. h = gf->chroma_h;
  192. r = gf->chroma_r;
  193. }
  194. if (FFMIN(w, h) > 2 * r)
  195. filter(gf, outpic->data[p], inpic->data[p], w, h, outpic->linesize[p], inpic->linesize[p], r);
  196. else if (outpic->data[p] != inpic->data[p])
  197. av_image_copy_plane(outpic->data[p], outpic->linesize[p], inpic->data[p], inpic->linesize[p], w, h);
  198. }
  199. avfilter_draw_slice(outlink, 0, inlink->h, 1);
  200. avfilter_end_frame(outlink);
  201. avfilter_unref_buffer(inpic);
  202. if (outpic != inpic)
  203. avfilter_unref_buffer(outpic);
  204. }
  205. AVFilter avfilter_vf_gradfun = {
  206. .name = "gradfun",
  207. .description = NULL_IF_CONFIG_SMALL("Debands video quickly using gradients."),
  208. .priv_size = sizeof(GradFunContext),
  209. .init = init,
  210. .uninit = uninit,
  211. .query_formats = query_formats,
  212. .inputs = (const AVFilterPad[]) {{ .name = "default",
  213. .type = AVMEDIA_TYPE_VIDEO,
  214. .config_props = config_input,
  215. .start_frame = start_frame,
  216. .draw_slice = null_draw_slice,
  217. .end_frame = end_frame,
  218. .min_perms = AV_PERM_READ, },
  219. { .name = NULL}},
  220. .outputs = (const AVFilterPad[]) {{ .name = "default",
  221. .type = AVMEDIA_TYPE_VIDEO, },
  222. { .name = NULL}},
  223. };