vf_transpose.c 7.6 KB

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  1. /*
  2. * Copyright (c) 2010 Stefano Sabatini
  3. * Copyright (c) 2008 Vitor Sessak
  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. * transposition filter
  24. * Based on MPlayer libmpcodecs/vf_rotate.c.
  25. */
  26. #include "libavutil/intreadwrite.h"
  27. #include "libavutil/pixdesc.h"
  28. #include "libavutil/imgutils.h"
  29. #include "avfilter.h"
  30. typedef struct {
  31. int hsub, vsub;
  32. int pixsteps[4];
  33. /* 0 Rotate by 90 degrees counterclockwise and vflip. */
  34. /* 1 Rotate by 90 degrees clockwise. */
  35. /* 2 Rotate by 90 degrees counterclockwise. */
  36. /* 3 Rotate by 90 degrees clockwise and vflip. */
  37. int dir;
  38. } TransContext;
  39. static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
  40. {
  41. TransContext *trans = ctx->priv;
  42. trans->dir = 0;
  43. if (args)
  44. sscanf(args, "%d", &trans->dir);
  45. if (trans->dir < 0 || trans->dir > 3) {
  46. av_log(ctx, AV_LOG_ERROR, "Invalid value %d not between 0 and 3.\n",
  47. trans->dir);
  48. return AVERROR(EINVAL);
  49. }
  50. return 0;
  51. }
  52. static int query_formats(AVFilterContext *ctx)
  53. {
  54. enum PixelFormat pix_fmts[] = {
  55. PIX_FMT_ARGB, PIX_FMT_RGBA,
  56. PIX_FMT_ABGR, PIX_FMT_BGRA,
  57. PIX_FMT_RGB24, PIX_FMT_BGR24,
  58. PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
  59. PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
  60. PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
  61. PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
  62. PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
  63. PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
  64. PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
  65. PIX_FMT_NV12, PIX_FMT_NV21,
  66. PIX_FMT_RGB8, PIX_FMT_BGR8,
  67. PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
  68. PIX_FMT_YUV444P, PIX_FMT_YUVJ444P,
  69. PIX_FMT_YUV420P, PIX_FMT_YUVJ420P,
  70. PIX_FMT_YUV410P,
  71. PIX_FMT_YUVA420P, PIX_FMT_GRAY8,
  72. PIX_FMT_NONE
  73. };
  74. avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
  75. return 0;
  76. }
  77. static int config_props_output(AVFilterLink *outlink)
  78. {
  79. AVFilterContext *ctx = outlink->src;
  80. TransContext *trans = ctx->priv;
  81. AVFilterLink *inlink = ctx->inputs[0];
  82. const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[outlink->format];
  83. trans->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
  84. trans->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
  85. av_image_fill_max_pixsteps(trans->pixsteps, NULL, pixdesc);
  86. outlink->w = inlink->h;
  87. outlink->h = inlink->w;
  88. if (inlink->sample_aspect_ratio.num){
  89. outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);
  90. } else
  91. outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
  92. av_log(ctx, AV_LOG_INFO, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",
  93. inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,
  94. trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",
  95. trans->dir == 0 || trans->dir == 3);
  96. return 0;
  97. }
  98. static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
  99. {
  100. AVFilterLink *outlink = inlink->dst->outputs[0];
  101. outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
  102. outlink->w, outlink->h);
  103. outlink->out_buf->pts = picref->pts;
  104. if (picref->video->sample_aspect_ratio.num == 0) {
  105. outlink->out_buf->video->sample_aspect_ratio = picref->video->sample_aspect_ratio;
  106. } else {
  107. outlink->out_buf->video->sample_aspect_ratio.num = picref->video->sample_aspect_ratio.den;
  108. outlink->out_buf->video->sample_aspect_ratio.den = picref->video->sample_aspect_ratio.num;
  109. }
  110. avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
  111. }
  112. static void end_frame(AVFilterLink *inlink)
  113. {
  114. TransContext *trans = inlink->dst->priv;
  115. AVFilterBufferRef *inpic = inlink->cur_buf;
  116. AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
  117. AVFilterLink *outlink = inlink->dst->outputs[0];
  118. int plane;
  119. for (plane = 0; outpic->data[plane]; plane++) {
  120. int hsub = plane == 1 || plane == 2 ? trans->hsub : 0;
  121. int vsub = plane == 1 || plane == 2 ? trans->vsub : 0;
  122. int pixstep = trans->pixsteps[plane];
  123. int inh = inpic->video->h>>vsub;
  124. int outw = outpic->video->w>>hsub;
  125. int outh = outpic->video->h>>vsub;
  126. uint8_t *out, *in;
  127. int outlinesize, inlinesize;
  128. int x, y;
  129. out = outpic->data[plane]; outlinesize = outpic->linesize[plane];
  130. in = inpic ->data[plane]; inlinesize = inpic ->linesize[plane];
  131. if (trans->dir&1) {
  132. in += inpic->linesize[plane] * (inh-1);
  133. inlinesize *= -1;
  134. }
  135. if (trans->dir&2) {
  136. out += outpic->linesize[plane] * (outh-1);
  137. outlinesize *= -1;
  138. }
  139. for (y = 0; y < outh; y++) {
  140. switch (pixstep) {
  141. case 1:
  142. for (x = 0; x < outw; x++)
  143. out[x] = in[x*inlinesize + y];
  144. break;
  145. case 2:
  146. for (x = 0; x < outw; x++)
  147. *((uint16_t *)(out + 2*x)) = *((uint16_t *)(in + x*inlinesize + y*2));
  148. break;
  149. case 3:
  150. for (x = 0; x < outw; x++) {
  151. int32_t v = AV_RB24(in + x*inlinesize + y*3);
  152. AV_WB24(out + 3*x, v);
  153. }
  154. break;
  155. case 4:
  156. for (x = 0; x < outw; x++)
  157. *((uint32_t *)(out + 4*x)) = *((uint32_t *)(in + x*inlinesize + y*4));
  158. break;
  159. }
  160. out += outlinesize;
  161. }
  162. }
  163. avfilter_unref_buffer(inpic);
  164. avfilter_draw_slice(outlink, 0, outpic->video->h, 1);
  165. avfilter_end_frame(outlink);
  166. avfilter_unref_buffer(outpic);
  167. }
  168. static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
  169. AVFilter avfilter_vf_transpose = {
  170. .name = "transpose",
  171. .description = NULL_IF_CONFIG_SMALL("Transpose input video."),
  172. .init = init,
  173. .priv_size = sizeof(TransContext),
  174. .query_formats = query_formats,
  175. .inputs = (const AVFilterPad[]) {{ .name = "default",
  176. .type = AVMEDIA_TYPE_VIDEO,
  177. .start_frame = start_frame,
  178. .draw_slice = null_draw_slice,
  179. .end_frame = end_frame,
  180. .min_perms = AV_PERM_READ, },
  181. { .name = NULL}},
  182. .outputs = (const AVFilterPad[]) {{ .name = "default",
  183. .config_props = config_props_output,
  184. .type = AVMEDIA_TYPE_VIDEO, },
  185. { .name = NULL}},
  186. };