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FFmpeg/libavcodec/wmv2dsp.c

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  1. /*

  2.  * This file is part of Libav.

  3.  *

  4.  * Libav is free software; you can redistribute it and/or

  5.  * modify it under the terms of the GNU Lesser General Public

  6.  * License as published by the Free Software Foundation; either

  7.  * version 2.1 of the License, or (at your option) any later version.

  8.  *

  9.  * Libav is distributed in the hope that it will be useful,

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

  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  12.  * Lesser General Public License for more details.

  13.  *

  14.  * You should have received a copy of the GNU Lesser General Public

  15.  * License along with Libav; if not, write to the Free Software

  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  17.  */

  18. 

  19. #include "libavutil/attributes.h"

  20. #include "libavutil/common.h"

  21. #include "avcodec.h"

  22. #include "idctdsp.h"

  23. #include "mathops.h"

  24. #include "wmv2dsp.h"

  25. 

  26. #define W0 2048

  27. #define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */

  28. #define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */

  29. #define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */

  30. #define W4 2048 /* 2048*sqrt (2)*cos (4*pi/16) */

  31. #define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */

  32. #define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */

  33. #define W7 565  /* 2048*sqrt (2)*cos (7*pi/16) */

  34. 

  35. static void wmv2_idct_row(short * b)

  36. {

  37.     int s1, s2;

  38.     int a0, a1, a2, a3, a4, a5, a6, a7;

  39. 

  40.     /* step 1 */

  41.     a1 = W1 * b[1] + W7 * b[7];

  42.     a7 = W7 * b[1] - W1 * b[7];

  43.     a5 = W5 * b[5] + W3 * b[3];

  44.     a3 = W3 * b[5] - W5 * b[3];

  45.     a2 = W2 * b[2] + W6 * b[6];

  46.     a6 = W6 * b[2] - W2 * b[6];

  47.     a0 = W0 * b[0] + W0 * b[4];

  48.     a4 = W0 * b[0] - W0 * b[4];

  49. 

  50.     /* step 2 */

  51.     s1 = (181 * (a1 - a5 + a7 - a3) + 128) >> 8; // 1, 3, 5, 7

  52.     s2 = (181 * (a1 - a5 - a7 + a3) + 128) >> 8;

  53. 

  54.     /* step 3 */

  55.     b[0] = (a0 + a2 + a1 + a5 + (1 << 7)) >> 8;

  56.     b[1] = (a4 + a6 + s1      + (1 << 7)) >> 8;

  57.     b[2] = (a4 - a6 + s2      + (1 << 7)) >> 8;

  58.     b[3] = (a0 - a2 + a7 + a3 + (1 << 7)) >> 8;

  59.     b[4] = (a0 - a2 - a7 - a3 + (1 << 7)) >> 8;

  60.     b[5] = (a4 - a6 - s2      + (1 << 7)) >> 8;

  61.     b[6] = (a4 + a6 - s1      + (1 << 7)) >> 8;

  62.     b[7] = (a0 + a2 - a1 - a5 + (1 << 7)) >> 8;

  63. }

  64. 

  65. static void wmv2_idct_col(short * b)

  66. {

  67.     int s1, s2;

  68.     int a0, a1, a2, a3, a4, a5, a6, a7;

  69. 

  70.     /* step 1, with extended precision */

  71.     a1 = (W1 * b[8 * 1] + W7 * b[8 * 7] + 4) >> 3;

  72.     a7 = (W7 * b[8 * 1] - W1 * b[8 * 7] + 4) >> 3;

  73.     a5 = (W5 * b[8 * 5] + W3 * b[8 * 3] + 4) >> 3;

  74.     a3 = (W3 * b[8 * 5] - W5 * b[8 * 3] + 4) >> 3;

  75.     a2 = (W2 * b[8 * 2] + W6 * b[8 * 6] + 4) >> 3;

  76.     a6 = (W6 * b[8 * 2] - W2 * b[8 * 6] + 4) >> 3;

  77.     a0 = (W0 * b[8 * 0] + W0 * b[8 * 4]    ) >> 3;

  78.     a4 = (W0 * b[8 * 0] - W0 * b[8 * 4]    ) >> 3;

  79. 

  80.     /* step 2 */

  81.     s1 = (181 * (a1 - a5 + a7 - a3) + 128) >> 8;

  82.     s2 = (181 * (a1 - a5 - a7 + a3) + 128) >> 8;

  83. 

  84.     /* step 3 */

  85.     b[8 * 0] = (a0 + a2 + a1 + a5 + (1 << 13)) >> 14;

  86.     b[8 * 1] = (a4 + a6 + s1      + (1 << 13)) >> 14;

  87.     b[8 * 2] = (a4 - a6 + s2      + (1 << 13)) >> 14;

  88.     b[8 * 3] = (a0 - a2 + a7 + a3 + (1 << 13)) >> 14;

  89. 

  90.     b[8 * 4] = (a0 - a2 - a7 - a3 + (1 << 13)) >> 14;

  91.     b[8 * 5] = (a4 - a6 - s2      + (1 << 13)) >> 14;

  92.     b[8 * 6] = (a4 + a6 - s1      + (1 << 13)) >> 14;

  93.     b[8 * 7] = (a0 + a2 - a1 - a5 + (1 << 13)) >> 14;

  94. }

  95. 

  96. static void wmv2_idct_add_c(uint8_t *dest, int line_size, int16_t *block)

  97. {

  98.     int i;

  99. 

  100.     for (i = 0; i < 64; i += 8)

  101.         wmv2_idct_row(block + i);

  102.     for (i = 0; i < 8; i++)

  103.         wmv2_idct_col(block + i);

  104. 

  105.     for (i = 0; i < 8; i++) {

  106.         dest[0] = av_clip_uint8(dest[0] + block[0]);

  107.         dest[1] = av_clip_uint8(dest[1] + block[1]);

  108.         dest[2] = av_clip_uint8(dest[2] + block[2]);

  109.         dest[3] = av_clip_uint8(dest[3] + block[3]);

  110.         dest[4] = av_clip_uint8(dest[4] + block[4]);

  111.         dest[5] = av_clip_uint8(dest[5] + block[5]);

  112.         dest[6] = av_clip_uint8(dest[6] + block[6]);

  113.         dest[7] = av_clip_uint8(dest[7] + block[7]);

  114.         dest += line_size;

  115.         block += 8;

  116.     }

  117. }

  118. 

  119. static void wmv2_idct_put_c(uint8_t *dest, int line_size, int16_t *block)

  120. {

  121.     int i;

  122. 

  123.     for (i = 0; i < 64; i += 8)

  124.         wmv2_idct_row(block + i);

  125.     for (i = 0; i < 8; i++)

  126.         wmv2_idct_col(block + i);

  127. 

  128.     for (i = 0; i < 8; i++) {

  129.         dest[0] = av_clip_uint8(block[0]);

  130.         dest[1] = av_clip_uint8(block[1]);

  131.         dest[2] = av_clip_uint8(block[2]);

  132.         dest[3] = av_clip_uint8(block[3]);

  133.         dest[4] = av_clip_uint8(block[4]);

  134.         dest[5] = av_clip_uint8(block[5]);

  135.         dest[6] = av_clip_uint8(block[6]);

  136.         dest[7] = av_clip_uint8(block[7]);

  137.         dest += line_size;

  138.         block += 8;

  139.     }

  140. }

  141. 

  142. static void wmv2_mspel8_h_lowpass(uint8_t *dst, const uint8_t *src,

  143.                                   int dstStride, int srcStride, int h)

  144. {

  145.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  146.     int i;

  147. 

  148.     for (i = 0; i < h; i++) {

  149.         dst[0] = cm[(9 * (src[0] + src[1]) - (src[-1] + src[2]) + 8) >> 4];

  150.         dst[1] = cm[(9 * (src[1] + src[2]) - (src[0]  + src[3]) + 8) >> 4];

  151.         dst[2] = cm[(9 * (src[2] + src[3]) - (src[1]  + src[4]) + 8) >> 4];

  152.         dst[3] = cm[(9 * (src[3] + src[4]) - (src[2]  + src[5]) + 8) >> 4];

  153.         dst[4] = cm[(9 * (src[4] + src[5]) - (src[3]  + src[6]) + 8) >> 4];

  154.         dst[5] = cm[(9 * (src[5] + src[6]) - (src[4]  + src[7]) + 8) >> 4];

  155.         dst[6] = cm[(9 * (src[6] + src[7]) - (src[5]  + src[8]) + 8) >> 4];

  156.         dst[7] = cm[(9 * (src[7] + src[8]) - (src[6]  + src[9]) + 8) >> 4];

  157.         dst   += dstStride;

  158.         src   += srcStride;

  159.     }

  160. }

  161. 

  162. static void wmv2_mspel8_v_lowpass(uint8_t *dst, const uint8_t *src,

  163.                                   int dstStride, int srcStride, int w)

  164. {

  165.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  166.     int i;

  167. 

  168.     for (i = 0; i < w; i++) {

  169.         const int src_1 = src[-srcStride];

  170.         const int src0  = src[0];

  171.         const int src1  = src[srcStride];

  172.         const int src2  = src[2 * srcStride];

  173.         const int src3  = src[3 * srcStride];

  174.         const int src4  = src[4 * srcStride];

  175.         const int src5  = src[5 * srcStride];

  176.         const int src6  = src[6 * srcStride];

  177.         const int src7  = src[7 * srcStride];

  178.         const int src8  = src[8 * srcStride];

  179.         const int src9  = src[9 * srcStride];

  180.         dst[0 * dstStride] = cm[(9 * (src0 + src1) - (src_1 + src2) + 8) >> 4];

  181.         dst[1 * dstStride] = cm[(9 * (src1 + src2) - (src0  + src3) + 8) >> 4];

  182.         dst[2 * dstStride] = cm[(9 * (src2 + src3) - (src1  + src4) + 8) >> 4];

  183.         dst[3 * dstStride] = cm[(9 * (src3 + src4) - (src2  + src5) + 8) >> 4];

  184.         dst[4 * dstStride] = cm[(9 * (src4 + src5) - (src3  + src6) + 8) >> 4];

  185.         dst[5 * dstStride] = cm[(9 * (src5 + src6) - (src4  + src7) + 8) >> 4];

  186.         dst[6 * dstStride] = cm[(9 * (src6 + src7) - (src5  + src8) + 8) >> 4];

  187.         dst[7 * dstStride] = cm[(9 * (src7 + src8) - (src6  + src9) + 8) >> 4];

  188.         src++;

  189.         dst++;

  190.     }

  191. }

  192. 

  193. static void put_mspel8_mc10_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)

  194. {

  195.     uint8_t half[64];

  196. 

  197.     wmv2_mspel8_h_lowpass(half, src, 8, stride, 8);

  198.     ff_put_pixels8_l2_8(dst, src, half, stride, stride, 8, 8);

  199. }

  200. 

  201. static void put_mspel8_mc20_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)

  202. {

  203.     wmv2_mspel8_h_lowpass(dst, src, stride, stride, 8);

  204. }

  205. 

  206. static void put_mspel8_mc30_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)

  207. {

  208.     uint8_t half[64];

  209. 

  210.     wmv2_mspel8_h_lowpass(half, src, 8, stride, 8);

  211.     ff_put_pixels8_l2_8(dst, src + 1, half, stride, stride, 8, 8);

  212. }

  213. 

  214. static void put_mspel8_mc02_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)

  215. {

  216.     wmv2_mspel8_v_lowpass(dst, src, stride, stride, 8);

  217. }

  218. 

  219. static void put_mspel8_mc12_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)

  220. {

  221.     uint8_t halfH[88];

  222.     uint8_t halfV[64];

  223.     uint8_t halfHV[64];

  224. 

  225.     wmv2_mspel8_h_lowpass(halfH, src - stride, 8, stride, 11);

  226.     wmv2_mspel8_v_lowpass(halfV, src, 8, stride, 8);

  227.     wmv2_mspel8_v_lowpass(halfHV, halfH + 8, 8, 8, 8);

  228.     ff_put_pixels8_l2_8(dst, halfV, halfHV, stride, 8, 8, 8);

  229. }

  230. 

  231. static void put_mspel8_mc32_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)

  232. {

  233.     uint8_t halfH[88];

  234.     uint8_t halfV[64];

  235.     uint8_t halfHV[64];

  236. 

  237.     wmv2_mspel8_h_lowpass(halfH, src - stride, 8, stride, 11);

  238.     wmv2_mspel8_v_lowpass(halfV, src + 1, 8, stride, 8);

  239.     wmv2_mspel8_v_lowpass(halfHV, halfH + 8, 8, 8, 8);

  240.     ff_put_pixels8_l2_8(dst, halfV, halfHV, stride, 8, 8, 8);

  241. }

  242. 

  243. static void put_mspel8_mc22_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)

  244. {

  245.     uint8_t halfH[88];

  246. 

  247.     wmv2_mspel8_h_lowpass(halfH, src - stride, 8, stride, 11);

  248.     wmv2_mspel8_v_lowpass(dst, halfH + 8, stride, 8, 8);

  249. }

  250. 

  251. av_cold void ff_wmv2dsp_init(WMV2DSPContext *c)

  252. {

  253.     c->idct_add  = wmv2_idct_add_c;

  254.     c->idct_put  = wmv2_idct_put_c;

  255.     c->idct_perm = FF_IDCT_PERM_NONE;

  256. 

  257.     c->put_mspel_pixels_tab[0] = ff_put_pixels8x8_c;

  258.     c->put_mspel_pixels_tab[1] = put_mspel8_mc10_c;

  259.     c->put_mspel_pixels_tab[2] = put_mspel8_mc20_c;

  260.     c->put_mspel_pixels_tab[3] = put_mspel8_mc30_c;

  261.     c->put_mspel_pixels_tab[4] = put_mspel8_mc02_c;

  262.     c->put_mspel_pixels_tab[5] = put_mspel8_mc12_c;

  263.     c->put_mspel_pixels_tab[6] = put_mspel8_mc22_c;

  264.     c->put_mspel_pixels_tab[7] = put_mspel8_mc32_c;

  265. }