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FFmpeg/libavcodec/imgconvert.c

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  1. /*

  2.  * Misc image convertion routines

  3.  * Copyright (c) 2001 Gerard Lantau.

  4.  *

  5.  * This program is free software; you can redistribute it and/or modify

  6.  * it under the terms of the GNU General Public License as published by

  7.  * the Free Software Foundation; either version 2 of the License, or

  8.  * (at your option) any later version.

  9.  *

  10.  * This program is distributed in the hope that it will be useful,

  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  13.  * GNU General Public License for more details.

  14.  *

  15.  * You should have received a copy of the GNU General Public License

  16.  * along with this program; if not, write to the Free Software

  17.  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  18.  */

  19. #include "avcodec.h"

  20. #include "dsputil.h"

  21. 

  22. #ifdef USE_FASTMEMCPY

  23. #include "fastmemcpy.h"

  24. #endif

  25. /* XXX: totally non optimized */

  26. 

  27. static void yuv422_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,

  28.                               UINT8 *src, int width, int height)

  29. {

  30.     int x, y;

  31.     UINT8 *p = src;

  32. 

  33.     for(y=0;y<height;y+=2) {

  34.         for(x=0;x<width;x+=2) {

  35.             lum[0] = p[0];

  36.             cb[0] = p[1];

  37.             lum[1] = p[2];

  38.             cr[0] = p[3];

  39.             p += 4;

  40.             lum += 2;

  41.             cb++;

  42.             cr++;

  43.         }

  44.         for(x=0;x<width;x+=2) {

  45.             lum[0] = p[0];

  46.             lum[1] = p[2];

  47.             p += 4;

  48.             lum += 2;

  49.         }

  50.     }

  51. }

  52. 

  53. #define SCALEBITS 8

  54. #define ONE_HALF  (1 << (SCALEBITS - 1))

  55. #define FIX(x)		((int) ((x) * (1L<<SCALEBITS) + 0.5))

  56. 

  57. static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,

  58.                               UINT8 *src, int width, int height)

  59. {

  60.     int wrap, wrap3, x, y;

  61.     int r, g, b, r1, g1, b1;

  62.     UINT8 *p;

  63. 

  64.     wrap = width;

  65.     wrap3 = width * 3;

  66.     p = src;

  67.     for(y=0;y<height;y+=2) {

  68.         for(x=0;x<width;x+=2) {

  69.             r = p[0];

  70.             g = p[1];

  71.             b = p[2];

  72.             r1 = r;

  73.             g1 = g;

  74.             b1 = b;

  75.             lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 

  76.                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

  77.             r = p[3];

  78.             g = p[4];

  79.             b = p[5];

  80.             r1 += r;

  81.             g1 += g;

  82.             b1 += b;

  83.             lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 

  84.                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

  85.             p += wrap3;

  86.             lum += wrap;

  87. 

  88.             r = p[0];

  89.             g = p[1];

  90.             b = p[2];

  91.             r1 += r;

  92.             g1 += g;

  93.             b1 += b;

  94.             lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 

  95.                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

  96.             r = p[3];

  97.             g = p[4];

  98.             b = p[5];

  99.             r1 += r;

  100.             g1 += g;

  101.             b1 += b;

  102.             lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 

  103.                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

  104.             

  105.             cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 

  106.                       FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

  107.             cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 

  108.                      FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

  109. 

  110.             cb++;

  111.             cr++;

  112.             p += -wrap3 + 2 * 3;

  113.             lum += -wrap + 2;

  114.         }

  115.         p += wrap3;

  116.         lum += wrap;

  117.     }

  118. }

  119. 

  120. static void bgr24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,

  121.                               UINT8 *src, int width, int height)

  122. {

  123.     int wrap, wrap3, x, y;

  124.     int r, g, b, r1, g1, b1;

  125.     UINT8 *p;

  126. 

  127.     wrap = width;

  128.     wrap3 = width * 3;

  129.     p = src;

  130.     for(y=0;y<height;y+=2) {

  131.         for(x=0;x<width;x+=2) {

  132.             b = p[0];

  133.             g = p[1];

  134.             r = p[2];

  135.             r1 = r;

  136.             g1 = g;

  137.             b1 = b;

  138.             lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 

  139.                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

  140.             b = p[3];

  141.             g = p[4];

  142.             r = p[5];

  143.             r1 += r;

  144.             g1 += g;

  145.             b1 += b;

  146.             lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 

  147.                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

  148.             p += wrap3;

  149.             lum += wrap;

  150. 

  151.             b = p[0];

  152.             g = p[1];

  153.             r = p[2];

  154.             r1 += r;

  155.             g1 += g;

  156.             b1 += b;

  157.             lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g + 

  158.                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

  159.             b = p[3];

  160.             g = p[4];

  161.             r = p[5];

  162.             r1 += r;

  163.             g1 += g;

  164.             b1 += b;

  165.             lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g + 

  166.                       FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;

  167.             

  168.             cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + 

  169.                       FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

  170.             cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 - 

  171.                      FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;

  172. 

  173.             cb++;

  174.             cr++;

  175.             p += -wrap3 + 2 * 3;

  176.             lum += -wrap + 2;

  177.         }

  178.         p += wrap3;

  179.         lum += wrap;

  180.     }

  181. }

  182. 

  183. /* XXX: use generic filter ? */

  184. /* 1x2 -> 1x1 */

  185. static void shrink2(UINT8 *dst, int dst_wrap, 

  186.                     UINT8 *src, int src_wrap,

  187.                     int width, int height)

  188. {

  189.     int w;

  190.     UINT8 *s1, *s2, *d;

  191. 

  192.     for(;height > 0; height--) {

  193.         s1 = src;

  194.         s2 = s1 + src_wrap;

  195.         d = dst;

  196.         for(w = width;w >= 4; w-=4) {

  197.             d[0] = (s1[0] + s2[0]) >> 1;

  198.             d[1] = (s1[1] + s2[1]) >> 1;

  199.             d[2] = (s1[2] + s2[2]) >> 1;

  200.             d[3] = (s1[3] + s2[3]) >> 1;

  201.             s1 += 4;

  202.             s2 += 4;

  203.             d += 4;

  204.         }

  205.         for(;w > 0; w--) {

  206.             d[0] = (s1[0] + s2[0]) >> 1;

  207.             s1++;

  208.             s2++;

  209.             d++;

  210.         }

  211.         src += 2 * src_wrap;

  212.         dst += dst_wrap;

  213.     }

  214. }

  215. 

  216. /* 2x2 -> 1x1 */

  217. static void shrink22(UINT8 *dst, int dst_wrap, 

  218.                      UINT8 *src, int src_wrap,

  219.                      int width, int height)

  220. {

  221.     int w;

  222.     UINT8 *s1, *s2, *d;

  223. 

  224.     for(;height > 0; height--) {

  225.         s1 = src;

  226.         s2 = s1 + src_wrap;

  227.         d = dst;

  228.         for(w = width;w >= 4; w-=4) {

  229.             d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 1;

  230.             d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 1;

  231.             d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 1;

  232.             d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 1;

  233.             s1 += 8;

  234.             s2 += 8;

  235.             d += 4;

  236.         }

  237.         for(;w > 0; w--) {

  238.             d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 1;

  239.             s1 += 2;

  240.             s2 += 2;

  241.             d++;

  242.         }

  243.         src += 2 * src_wrap;

  244.         dst += dst_wrap;

  245.     }

  246. }

  247. 

  248. static void img_copy(UINT8 *dst, int dst_wrap, 

  249.                      UINT8 *src, int src_wrap,

  250.                      int width, int height)

  251. {

  252.     for(;height > 0; height--) {

  253.         memcpy(dst, src, width);

  254.         dst += dst_wrap;

  255.         src += src_wrap;

  256.     }

  257. }

  258. 

  259. #define SCALE_BITS 10

  260. 

  261. #define C_Y  (76309 >> (16 - SCALE_BITS))

  262. #define C_RV (117504 >> (16 - SCALE_BITS))

  263. #define C_BU (138453 >> (16 - SCALE_BITS))

  264. #define C_GU (13954 >> (16 - SCALE_BITS))

  265. #define C_GV (34903 >> (16 - SCALE_BITS))

  266. 

  267. #define RGBOUT(r, g, b, y1)\

  268. {\

  269.     y = (y1 - 16) * C_Y;\

  270.     r = cm[(y + r_add) >> SCALE_BITS];\

  271.     g = cm[(y + g_add) >> SCALE_BITS];\

  272.     b = cm[(y + b_add) >> SCALE_BITS];\

  273. }

  274. 

  275. /* XXX: no chroma interpolating is done */

  276. static void yuv420p_to_rgb24(AVPicture *dst, AVPicture *src, 

  277.                              int width, int height)

  278. {

  279.     UINT8 *y1_ptr, *y2_ptr, *cb_ptr, *cr_ptr, *d, *d1, *d2;

  280.     int w, y, cb, cr, r_add, g_add, b_add, width2;

  281.     UINT8 *cm = cropTbl + MAX_NEG_CROP;

  282. 

  283.     d = dst->data[0];

  284.     y1_ptr = src->data[0];

  285.     cb_ptr = src->data[1];

  286.     cr_ptr = src->data[2];

  287.     width2 = width >> 1;

  288.     for(;height > 0; height -= 2) {

  289.         d1 = d;

  290.         d2 = d + dst->linesize[0];

  291.         y2_ptr = y1_ptr + src->linesize[0];

  292.         for(w = width2; w > 0; w --) {

  293.             cb = cb_ptr[0] - 128;

  294.             cr = cr_ptr[0] - 128;

  295.             r_add = C_RV * cr + (1 << (SCALE_BITS - 1));

  296.             g_add = - C_GU * cb - C_GV * cr + (1 << (SCALE_BITS - 1));

  297.             b_add = C_BU * cb + (1 << (SCALE_BITS - 1));

  298.             

  299.             /* output 4 pixels */

  300.             RGBOUT(d1[0], d1[1], d1[2], y1_ptr[0]);

  301.             RGBOUT(d1[3], d1[4], d1[5], y1_ptr[1]);

  302.             RGBOUT(d2[0], d2[1], d2[2], y2_ptr[0]);

  303.             RGBOUT(d2[3], d2[4], d2[5], y2_ptr[1]);

  304. 

  305.             d1 += 6;

  306.             d2 += 6;

  307.             y1_ptr += 2;

  308.             y2_ptr += 2;

  309.             cb_ptr++;

  310.             cr_ptr++;

  311.         }

  312.         d += 2 * dst->linesize[0];

  313.         y1_ptr += 2 * src->linesize[0] - width;

  314.         cb_ptr += src->linesize[1] - width2;

  315.         cr_ptr += src->linesize[2] - width2;

  316.     }

  317. }

  318. 

  319. /* XXX: no chroma interpolating is done */

  320. static void yuv422p_to_rgb24(AVPicture *dst, AVPicture *src, 

  321.                              int width, int height)

  322. {

  323.     UINT8 *y1_ptr, *cb_ptr, *cr_ptr, *d, *d1;

  324.     int w, y, cb, cr, r_add, g_add, b_add, width2;

  325.     UINT8 *cm = cropTbl + MAX_NEG_CROP;

  326. 

  327.     d = dst->data[0];

  328.     y1_ptr = src->data[0];

  329.     cb_ptr = src->data[1];

  330.     cr_ptr = src->data[2];

  331.     width2 = width >> 1;

  332.     for(;height > 0; height --) {

  333.         d1 = d;

  334.         for(w = width2; w > 0; w --) {

  335.             cb = cb_ptr[0] - 128;

  336.             cr = cr_ptr[0] - 128;

  337.             r_add = C_RV * cr + (1 << (SCALE_BITS - 1));

  338.             g_add = - C_GU * cb - C_GV * cr + (1 << (SCALE_BITS - 1));

  339.             b_add = C_BU * cb + (1 << (SCALE_BITS - 1));

  340.             

  341.             /* output 2 pixels */

  342.             RGBOUT(d1[0], d1[1], d1[2], y1_ptr[0]);

  343.             RGBOUT(d1[3], d1[4], d1[5], y1_ptr[1]);

  344. 

  345.             d1 += 6;

  346.             y1_ptr += 2;

  347.             cb_ptr++;

  348.             cr_ptr++;

  349.         }

  350.         d += dst->linesize[0];

  351.         y1_ptr += src->linesize[0] - width;

  352.         cb_ptr += src->linesize[1] - width2;

  353.         cr_ptr += src->linesize[2] - width2;

  354.     }

  355. }

  356. 

  357. /* XXX: always use linesize. Return -1 if not supported */

  358. int img_convert(AVPicture *dst, int dst_pix_fmt,

  359.                 AVPicture *src, int pix_fmt, 

  360.                 int width, int height)

  361. {

  362.     int i;

  363. 

  364.     assert(pix_fmt != PIX_FMT_ANY && dst_pix_fmt != PIX_FMT_ANY);

  365. 

  366.     if (dst_pix_fmt == pix_fmt) {

  367.         switch(pix_fmt) {

  368.         case PIX_FMT_YUV420P:

  369.             for(i=0;i<3;i++) {

  370.                 if (i == 1) {

  371.                     width >>= 1;

  372.                     height >>= 1;

  373.                 }

  374.                 img_copy(dst->data[i], dst->linesize[i],

  375.                          src->data[i], src->linesize[i],

  376.                          width, height);

  377.             }

  378.             break;

  379.         default:

  380.             return -1;

  381.         }

  382.     } else if (dst_pix_fmt == PIX_FMT_YUV420P) {

  383.         

  384.         switch(pix_fmt) {

  385.         case PIX_FMT_YUV420P:

  386.             for(i=0;i<3;i++) {

  387.                 img_copy(dst->data[i], dst->linesize[i],

  388.                          src->data[i], src->linesize[i],

  389.                          width, height);

  390.             }

  391.             break;

  392.         case PIX_FMT_YUV422P:

  393.             img_copy(dst->data[0], dst->linesize[0],

  394.                      src->data[0], src->linesize[0],

  395.                      width, height);

  396.             width >>= 1;

  397.             height >>= 1;

  398.             for(i=1;i<3;i++) {

  399.                 shrink2(dst->data[i], dst->linesize[i],

  400.                         src->data[i], src->linesize[i],

  401.                         width, height);

  402.             }

  403.             break;

  404.         case PIX_FMT_YUV444P:

  405.             img_copy(dst->data[0], dst->linesize[0],

  406.                      src->data[0], src->linesize[0],

  407.                      width, height);

  408.             width >>= 1;

  409.             height >>= 1;

  410.             for(i=1;i<3;i++) {

  411.                 shrink22(dst->data[i], dst->linesize[i],

  412.                          src->data[i], src->linesize[i],

  413.                          width, height);

  414.             }

  415.             break;

  416.         case PIX_FMT_YUV422:

  417.             yuv422_to_yuv420p(dst->data[0], dst->data[1], dst->data[2], 

  418.                               src->data[0], width, height);

  419.             break;

  420.         case PIX_FMT_RGB24:

  421.             rgb24_to_yuv420p(dst->data[0], dst->data[1], dst->data[2], 

  422.                              src->data[0], width, height);

  423.             break;

  424.         case PIX_FMT_BGR24:

  425.             bgr24_to_yuv420p(dst->data[0], dst->data[1], dst->data[2], 

  426.                              src->data[0], width, height);

  427.             break;

  428.         default:

  429.             return -1;

  430.         }

  431.     } else if (dst_pix_fmt == PIX_FMT_RGB24) {

  432.         switch(pix_fmt) {

  433.         case PIX_FMT_YUV420P:

  434.             yuv420p_to_rgb24(dst, src, width, height);

  435.             break;

  436.         case PIX_FMT_YUV422P:

  437.             yuv422p_to_rgb24(dst, src, width, height);

  438.             break;

  439.         default:

  440.             return -1;

  441.         }

  442.     } else {

  443.         return -1;

  444.     }

  445.     return 0;

  446. }

  447. 

  448. /* filter parameters: [-1 4 2 4 -1] // 8 */

  449. static void deinterlace_line(UINT8 *dst, UINT8 *src, int src_wrap,

  450.                              int size)

  451. {

  452.     UINT8 *cm = cropTbl + MAX_NEG_CROP;

  453.     int sum;

  454.     UINT8 *s;

  455. 

  456.     for(;size > 0;size--) {

  457.         s = src;

  458.         sum = -s[0];

  459.         s += src_wrap;

  460.         sum += s[0] << 2;

  461.         s += src_wrap;

  462.         sum += s[0] << 1;

  463.         s += src_wrap;

  464.         sum += s[0] << 2;

  465.         s += src_wrap;

  466.         sum += -s[0];

  467.         dst[0] = cm[(sum + 4) >> 3];

  468.         dst++;

  469.         src++;

  470.     }

  471. }

  472. 

  473. /* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The

  474.    top field is copied as is, but the bottom field is deinterlaced

  475.    against the top field. */

  476. static void deinterlace_bottom_field(UINT8 *dst, int dst_wrap,

  477.                                      UINT8 *src1, int src_wrap,

  478.                                      int width, int height)

  479. {

  480.     UINT8 *src, *ptr;

  481.     int y, y1, i;

  482.     UINT8 *buf;

  483. 

  484.     buf = (UINT8*)av_malloc(5 * width);

  485. 

  486.     src = src1;

  487.     for(y=0;y<height;y+=2) {

  488.         /* copy top field line */

  489.         memcpy(dst, src, width);

  490.         dst += dst_wrap;

  491.         src += (1 - 2) * src_wrap;

  492.         y1 = y - 2;

  493.         if (y1 >= 0 && (y1 + 4) < height) {

  494.             /* fast case : no edges */

  495.             deinterlace_line(dst, src, src_wrap, width);

  496.         } else {

  497.             /* in order to use the same function, we use an intermediate buffer */

  498.             ptr = buf;

  499.             for(i=0;i<5;i++) {

  500.                 if (y1 < 0)

  501.                     memcpy(ptr, src1, width);

  502.                 else if (y1 >= height) 

  503.                     memcpy(ptr, src1 + (height - 1) * src_wrap, width);

  504.                 else

  505.                     memcpy(ptr, src1 + y1 * src_wrap, width);

  506.                 y1++;

  507.                 ptr += width;

  508.             }

  509.             deinterlace_line(dst, buf, width, width);

  510.         }

  511.         dst += dst_wrap;

  512.         src += (2 + 1) * src_wrap;

  513.     }

  514.     av_free(buf);

  515. }

  516. 

  517. 

  518. /* deinterlace, return -1 if format not handled */

  519. int avpicture_deinterlace(AVPicture *dst, AVPicture *src,

  520.                           int pix_fmt, int width, int height)

  521. {

  522.     int i;

  523. 

  524.     if (pix_fmt != PIX_FMT_YUV420P &&

  525.         pix_fmt != PIX_FMT_YUV422P &&

  526.         pix_fmt != PIX_FMT_YUV444P)

  527.         return -1;

  528.     if ((width & 1) != 0 || (height & 3) != 0)

  529.         return -1;

  530.     

  531.     for(i=0;i<3;i++) {

  532.         if (i == 1) {

  533.             switch(pix_fmt) {

  534.             case PIX_FMT_YUV420P:

  535.                 width >>= 1;

  536.                 height >>= 1;

  537.                 break;

  538.             case PIX_FMT_YUV422P:

  539.                 width >>= 1;

  540.                 break;

  541.             default:

  542.                 break;

  543.             }

  544.         }

  545.         deinterlace_bottom_field(dst->data[i], dst->linesize[i],

  546.                                  src->data[i], src->linesize[i],

  547.                                  width, height);

  548.     }

  549.     return 0;

  550. }