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FFmpeg/libavcodec/indeo3.c

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  1. /*

  2.  * Intel Indeo 3 (IV31, IV32, etc.) video decoder for ffmpeg

  3.  * written, produced, and directed by Alan Smithee

  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. #include <stdio.h>

  23. #include <stdlib.h>

  24. #include <string.h>

  25. 

  26. #include "avcodec.h"

  27. #include "dsputil.h"

  28. #include "bytestream.h"

  29. 

  30. #include "indeo3data.h"

  31. 

  32. typedef struct

  33. {

  34.     uint8_t *Ybuf;

  35.     uint8_t *Ubuf;

  36.     uint8_t *Vbuf;

  37.     unsigned short y_w, y_h;

  38.     unsigned short uv_w, uv_h;

  39. } YUVBufs;

  40. 

  41. typedef struct Indeo3DecodeContext {

  42.     AVCodecContext *avctx;

  43.     int width, height;

  44.     AVFrame frame;

  45. 

  46.     uint8_t *buf;

  47.     YUVBufs iv_frame[2];

  48.     YUVBufs *cur_frame;

  49.     YUVBufs *ref_frame;

  50. 

  51.     uint8_t *ModPred;

  52.     uint8_t *corrector_type;

  53. } Indeo3DecodeContext;

  54. 

  55. static const uint8_t corrector_type_0[24] = {

  56.     195, 159, 133, 115, 101,  93,  87,  77,

  57.     195, 159, 133, 115, 101,  93,  87,  77,

  58.     128,  79,  79,  79,  79,  79,  79,  79

  59. };

  60. 

  61. static const uint8_t corrector_type_2[8] = { 9, 7, 6, 8, 5, 4, 3, 2 };

  62. 

  63. static av_cold int build_modpred(Indeo3DecodeContext *s)

  64. {

  65.     int i, j;

  66. 

  67.     if (!(s->ModPred = av_malloc(8 * 128)))

  68.         return AVERROR(ENOMEM);

  69. 

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

  71.         s->ModPred[i+0*128] = i >  126 ? 254 : 2*(i + 1 - ((i + 1) % 2));

  72.         s->ModPred[i+1*128] = i ==   7 ?  20 :

  73.                               i == 119 ||

  74.                               i == 120 ? 236 : 2*(i + 2 - ((i + 1) % 3));

  75.         s->ModPred[i+2*128] = i >  125 ? 248 : 2*(i + 2 - ((i + 2) % 4));

  76.         s->ModPred[i+3*128] =                  2*(i + 1 - ((i - 3) % 5));

  77.         s->ModPred[i+4*128] = i ==   8 ?  20 : 2*(i + 1 - ((i - 3) % 6));

  78.         s->ModPred[i+5*128] =                  2*(i + 4 - ((i + 3) % 7));

  79.         s->ModPred[i+6*128] = i >  123 ? 240 : 2*(i + 4 - ((i + 4) % 8));

  80.         s->ModPred[i+7*128] =                  2*(i + 5 - ((i + 4) % 9));

  81.     }

  82. 

  83.     if (!(s->corrector_type = av_malloc(24 * 256)))

  84.         return AVERROR(ENOMEM);

  85. 

  86.     for (i=0; i < 24; ++i) {

  87.         for (j=0; j < 256; ++j) {

  88.             s->corrector_type[i*256+j] = j < corrector_type_0[i]          ? 1 :

  89.                                          j < 248 || (i == 16 && j == 248) ? 0 :

  90.                                          corrector_type_2[j - 248];

  91.         }

  92.     }

  93. 

  94.   return 0;

  95. }

  96. 

  97. static av_cold int iv_alloc_frames(Indeo3DecodeContext *s)

  98. {

  99.     int luma_width    = (s->width           + 3) & ~3,

  100.         luma_height   = (s->height          + 3) & ~3,

  101.         chroma_width  = ((luma_width  >> 2) + 3) & ~3,

  102.         chroma_height = ((luma_height >> 2) + 3) & ~3,

  103.         luma_pixels   = luma_width   * luma_height,

  104.         chroma_pixels = chroma_width * chroma_height,

  105.         i;

  106.     unsigned int bufsize = luma_pixels * 2 + luma_width * 3 +

  107.                           (chroma_pixels   + chroma_width) * 4;

  108. 

  109.     av_freep(&s->buf);

  110.     if(!(s->buf = av_malloc(bufsize)))

  111.         return AVERROR(ENOMEM);

  112.     s->iv_frame[0].y_w = s->iv_frame[1].y_w = luma_width;

  113.     s->iv_frame[0].y_h = s->iv_frame[1].y_h = luma_height;

  114.     s->iv_frame[0].uv_w = s->iv_frame[1].uv_w = chroma_width;

  115.     s->iv_frame[0].uv_h = s->iv_frame[1].uv_h = chroma_height;

  116. 

  117.     s->iv_frame[0].Ybuf = s->buf + luma_width;

  118.     i = luma_pixels + luma_width * 2;

  119.     s->iv_frame[1].Ybuf = s->buf + i;

  120.     i += (luma_pixels + luma_width);

  121.     s->iv_frame[0].Ubuf = s->buf + i;

  122.     i += (chroma_pixels + chroma_width);

  123.     s->iv_frame[1].Ubuf = s->buf + i;

  124.     i += (chroma_pixels + chroma_width);

  125.     s->iv_frame[0].Vbuf = s->buf + i;

  126.     i += (chroma_pixels + chroma_width);

  127.     s->iv_frame[1].Vbuf = s->buf + i;

  128. 

  129.     for(i = 1; i <= luma_width; i++)

  130.         s->iv_frame[0].Ybuf[-i] = s->iv_frame[1].Ybuf[-i] =

  131.             s->iv_frame[0].Ubuf[-i] = 0x80;

  132. 

  133.     for(i = 1; i <= chroma_width; i++) {

  134.         s->iv_frame[1].Ubuf[-i] = 0x80;

  135.         s->iv_frame[0].Vbuf[-i] = 0x80;

  136.         s->iv_frame[1].Vbuf[-i] = 0x80;

  137.         s->iv_frame[1].Vbuf[chroma_pixels+i-1] = 0x80;

  138.     }

  139. 

  140.     return 0;

  141. }

  142. 

  143. static av_cold void iv_free_func(Indeo3DecodeContext *s)

  144. {

  145.     av_freep(&s->buf);

  146.     av_freep(&s->ModPred);

  147.     av_freep(&s->corrector_type);

  148. }

  149. 

  150. struct ustr {

  151.     long xpos;

  152.     long ypos;

  153.     long width;

  154.     long height;

  155.     long split_flag;

  156.     long split_direction;

  157.     long usl7;

  158. };

  159. 

  160. 

  161. #define LV1_CHECK(buf1,rle_v3,lv1,lp2)  \

  162.     if((lv1 & 0x80) != 0) {             \

  163.         if(rle_v3 != 0)                 \

  164.             rle_v3 = 0;                 \

  165.         else {                          \

  166.             rle_v3 = 1;                 \

  167.             buf1 -= 2;                  \

  168.         }                               \

  169.     }                                   \

  170.     lp2 = 4;

  171. 

  172. 

  173. #define RLE_V3_CHECK(buf1,rle_v1,rle_v2,rle_v3)  \

  174.     if(rle_v3 == 0) {                            \

  175.         rle_v2 = *buf1;                          \

  176.         rle_v1 = 1;                              \

  177.         if(rle_v2 > 32) {                        \

  178.             rle_v2 -= 32;                        \

  179.             rle_v1 = 0;                          \

  180.         }                                        \

  181.         rle_v3 = 1;                              \

  182.     }                                            \

  183.     buf1--;

  184. 

  185. 

  186. #define LP2_CHECK(buf1,rle_v3,lp2)  \

  187.     if(lp2 == 0 && rle_v3 != 0)     \

  188.         rle_v3 = 0;                 \

  189.     else {                          \

  190.         buf1--;                     \

  191.         rle_v3 = 1;                 \

  192.     }

  193. 

  194. 

  195. #define RLE_V2_CHECK(buf1,rle_v2, rle_v3,lp2) \

  196.     rle_v2--;                                 \

  197.     if(rle_v2 == 0) {                         \

  198.         rle_v3 = 0;                           \

  199.         buf1 += 2;                            \

  200.     }                                         \

  201.     lp2 = 4;

  202. 

  203. static void iv_Decode_Chunk(Indeo3DecodeContext *s,

  204.         uint8_t *cur, uint8_t *ref, int width, int height,

  205.         const uint8_t *buf1, long cb_offset, const uint8_t *hdr,

  206.         const uint8_t *buf2, int min_width_160)

  207. {

  208.     uint8_t bit_buf;

  209.     unsigned long bit_pos, lv, lv1, lv2;

  210.     long *width_tbl, width_tbl_arr[10];

  211.     const signed char *ref_vectors;

  212.     uint8_t *cur_frm_pos, *ref_frm_pos, *cp, *cp2;

  213.     uint32_t *cur_lp, *ref_lp;

  214.     const uint32_t *correction_lp[2], *correctionloworder_lp[2], *correctionhighorder_lp[2];

  215.     uint8_t *correction_type_sp[2];

  216.     struct ustr strip_tbl[20], *strip;

  217.     int i, j, k, lp1, lp2, flag1, cmd, blks_width, blks_height, region_160_width,

  218.         rle_v1, rle_v2, rle_v3;

  219.     unsigned short res;

  220. 

  221.     bit_buf = 0;

  222.     ref_vectors = NULL;

  223. 

  224.     width_tbl = width_tbl_arr + 1;

  225.     i = (width < 0 ? width + 3 : width)/4;

  226.     for(j = -1; j < 8; j++)

  227.         width_tbl[j] = i * j;

  228. 

  229.     strip = strip_tbl;

  230. 

  231.     for(region_160_width = 0; region_160_width < (width - min_width_160); region_160_width += min_width_160);

  232. 

  233.     strip->ypos = strip->xpos = 0;

  234.     for(strip->width = min_width_160; width > strip->width; strip->width *= 2);

  235.     strip->height = height;

  236.     strip->split_direction = 0;

  237.     strip->split_flag = 0;

  238.     strip->usl7 = 0;

  239. 

  240.     bit_pos = 0;

  241. 

  242.     rle_v1 = rle_v2 = rle_v3 = 0;

  243. 

  244.     while(strip >= strip_tbl) {

  245.         if(bit_pos <= 0) {

  246.             bit_pos = 8;

  247.             bit_buf = *buf1++;

  248.         }

  249. 

  250.         bit_pos -= 2;

  251.         cmd = (bit_buf >> bit_pos) & 0x03;

  252. 

  253.         if(cmd == 0) {

  254.             strip++;

  255.             if(strip >= strip_tbl + FF_ARRAY_ELEMS(strip_tbl)) {

  256.                 av_log(s->avctx, AV_LOG_WARNING, "out of range strip\n");

  257.                 break;

  258.             }

  259.             memcpy(strip, strip-1, sizeof(*strip));

  260.             strip->split_flag = 1;

  261.             strip->split_direction = 0;

  262.             strip->height = (strip->height > 8 ? ((strip->height+8)>>4)<<3 : 4);

  263.             continue;

  264.         } else if(cmd == 1) {

  265.             strip++;

  266.             if(strip >= strip_tbl + FF_ARRAY_ELEMS(strip_tbl)) {

  267.                 av_log(s->avctx, AV_LOG_WARNING, "out of range strip\n");

  268.                 break;

  269.             }

  270.             memcpy(strip, strip-1, sizeof(*strip));

  271.             strip->split_flag = 1;

  272.             strip->split_direction = 1;

  273.             strip->width = (strip->width > 8 ? ((strip->width+8)>>4)<<3 : 4);

  274.             continue;

  275.         } else if(cmd == 2) {

  276.             if(strip->usl7 == 0) {

  277.                 strip->usl7 = 1;

  278.                 ref_vectors = NULL;

  279.                 continue;

  280.             }

  281.         } else if(cmd == 3) {

  282.             if(strip->usl7 == 0) {

  283.                 strip->usl7 = 1;

  284.                 ref_vectors = (const signed char*)buf2 + (*buf1 * 2);

  285.                 buf1++;

  286.                 continue;

  287.             }

  288.         }

  289. 

  290.         cur_frm_pos = cur + width * strip->ypos + strip->xpos;

  291. 

  292.         if((blks_width = strip->width) < 0)

  293.             blks_width += 3;

  294.         blks_width >>= 2;

  295.         blks_height = strip->height;

  296. 

  297.         if(ref_vectors != NULL) {

  298.             ref_frm_pos = ref + (ref_vectors[0] + strip->ypos) * width +

  299.                 ref_vectors[1] + strip->xpos;

  300.         } else

  301.             ref_frm_pos = cur_frm_pos - width_tbl[4];

  302. 

  303.         if(cmd == 2) {

  304.             if(bit_pos <= 0) {

  305.                 bit_pos = 8;

  306.                 bit_buf = *buf1++;

  307.             }

  308. 

  309.             bit_pos -= 2;

  310.             cmd = (bit_buf >> bit_pos) & 0x03;

  311. 

  312.             if(cmd == 0 || ref_vectors != NULL) {

  313.                 for(lp1 = 0; lp1 < blks_width; lp1++) {

  314.                     for(i = 0, j = 0; i < blks_height; i++, j += width_tbl[1])

  315.                         ((uint32_t *)cur_frm_pos)[j] = ((uint32_t *)ref_frm_pos)[j];

  316.                     cur_frm_pos += 4;

  317.                     ref_frm_pos += 4;

  318.                 }

  319.             } else if(cmd != 1)

  320.                 return;

  321.         } else {

  322.             k = *buf1 >> 4;

  323.             j = *buf1 & 0x0f;

  324.             buf1++;

  325.             lv = j + cb_offset;

  326. 

  327.             if((lv - 8) <= 7 && (k == 0 || k == 3 || k == 10)) {

  328.                 cp2 = s->ModPred + ((lv - 8) << 7);

  329.                 cp = ref_frm_pos;

  330.                 for(i = 0; i < blks_width << 2; i++) {

  331.                     int v = *cp >> 1;

  332.                     *(cp++) = cp2[v];

  333.                 }

  334.             }

  335. 

  336.             if(k == 1 || k == 4) {

  337.                 lv = (hdr[j] & 0xf) + cb_offset;

  338.                 correction_type_sp[0] = s->corrector_type + (lv << 8);

  339.                 correction_lp[0] = correction + (lv << 8);

  340.                 lv = (hdr[j] >> 4) + cb_offset;

  341.                 correction_lp[1] = correction + (lv << 8);

  342.                 correction_type_sp[1] = s->corrector_type + (lv << 8);

  343.             } else {

  344.                 correctionloworder_lp[0] = correctionloworder_lp[1] = correctionloworder + (lv << 8);

  345.                 correctionhighorder_lp[0] = correctionhighorder_lp[1] = correctionhighorder + (lv << 8);

  346.                 correction_type_sp[0] = correction_type_sp[1] = s->corrector_type + (lv << 8);

  347.                 correction_lp[0] = correction_lp[1] = correction + (lv << 8);

  348.             }

  349. 

  350.             switch(k) {

  351.             case 1:

  352.             case 0:                    /********** CASE 0 **********/

  353.                 for( ; blks_height > 0; blks_height -= 4) {

  354.                     for(lp1 = 0; lp1 < blks_width; lp1++) {

  355.                         for(lp2 = 0; lp2 < 4; ) {

  356.                             k = *buf1++;

  357.                             cur_lp = ((uint32_t *)cur_frm_pos) + width_tbl[lp2];

  358.                             ref_lp = ((uint32_t *)ref_frm_pos) + width_tbl[lp2];

  359. 

  360.                             switch(correction_type_sp[0][k]) {

  361.                             case 0:

  362.                                 *cur_lp = le2me_32(((le2me_32(*ref_lp) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

  363.                                 lp2++;

  364.                                 break;

  365.                             case 1:

  366.                                 res = ((le2me_16(((unsigned short *)(ref_lp))[0]) >> 1) + correction_lp[lp2 & 0x01][*buf1]) << 1;

  367.                                 ((unsigned short *)cur_lp)[0] = le2me_16(res);

  368.                                 res = ((le2me_16(((unsigned short *)(ref_lp))[1]) >> 1) + correction_lp[lp2 & 0x01][k]) << 1;

  369.                                 ((unsigned short *)cur_lp)[1] = le2me_16(res);

  370.                                 buf1++;

  371.                                 lp2++;

  372.                                 break;

  373.                             case 2:

  374.                                 if(lp2 == 0) {

  375.                                     for(i = 0, j = 0; i < 2; i++, j += width_tbl[1])

  376.                                         cur_lp[j] = ref_lp[j];

  377.                                     lp2 += 2;

  378.                                 }

  379.                                 break;

  380.                             case 3:

  381.                                 if(lp2 < 2) {

  382.                                     for(i = 0, j = 0; i < (3 - lp2); i++, j += width_tbl[1])

  383.                                         cur_lp[j] = ref_lp[j];

  384.                                     lp2 = 3;

  385.                                 }

  386.                                 break;

  387.                             case 8:

  388.                                 if(lp2 == 0) {

  389.                                     RLE_V3_CHECK(buf1,rle_v1,rle_v2,rle_v3)

  390. 

  391.                                     if(rle_v1 == 1 || ref_vectors != NULL) {

  392.                                         for(i = 0, j = 0; i < 4; i++, j += width_tbl[1])

  393.                                             cur_lp[j] = ref_lp[j];

  394.                                     }

  395. 

  396.                                     RLE_V2_CHECK(buf1,rle_v2, rle_v3,lp2)

  397.                                     break;

  398.                                 } else {

  399.                                     rle_v1 = 1;

  400.                                     rle_v2 = *buf1 - 1;

  401.                                 }

  402.                             case 5:

  403.                                 LP2_CHECK(buf1,rle_v3,lp2)

  404.                             case 4:

  405.                                 for(i = 0, j = 0; i < (4 - lp2); i++, j += width_tbl[1])

  406.                                     cur_lp[j] = ref_lp[j];

  407.                                 lp2 = 4;

  408.                                 break;

  409. 

  410.                             case 7:

  411.                                 if(rle_v3 != 0)

  412.                                     rle_v3 = 0;

  413.                                 else {

  414.                                     buf1--;

  415.                                     rle_v3 = 1;

  416.                                 }

  417.                             case 6:

  418.                                 if(ref_vectors != NULL) {

  419.                                     for(i = 0, j = 0; i < 4; i++, j += width_tbl[1])

  420.                                         cur_lp[j] = ref_lp[j];

  421.                                 }

  422.                                 lp2 = 4;

  423.                                 break;

  424. 

  425.                             case 9:

  426.                                 lv1 = *buf1++;

  427.                                 lv = (lv1 & 0x7F) << 1;

  428.                                 lv += (lv << 8);

  429.                                 lv += (lv << 16);

  430.                                 for(i = 0, j = 0; i < 4; i++, j += width_tbl[1])

  431.                                     cur_lp[j] = lv;

  432. 

  433.                                 LV1_CHECK(buf1,rle_v3,lv1,lp2)

  434.                                 break;

  435.                             default:

  436.                                 return;

  437.                             }

  438.                         }

  439. 

  440.                         cur_frm_pos += 4;

  441.                         ref_frm_pos += 4;

  442.                     }

  443. 

  444.                     cur_frm_pos += ((width - blks_width) * 4);

  445.                     ref_frm_pos += ((width - blks_width) * 4);

  446.                 }

  447.                 break;

  448. 

  449.             case 4:

  450.             case 3:                    /********** CASE 3 **********/

  451.                 if(ref_vectors != NULL)

  452.                     return;

  453.                 flag1 = 1;

  454. 

  455.                 for( ; blks_height > 0; blks_height -= 8) {

  456.                     for(lp1 = 0; lp1 < blks_width; lp1++) {

  457.                         for(lp2 = 0; lp2 < 4; ) {

  458.                             k = *buf1++;

  459. 

  460.                             cur_lp = ((uint32_t *)cur_frm_pos) + width_tbl[lp2 * 2];

  461.                             ref_lp = ((uint32_t *)cur_frm_pos) + width_tbl[(lp2 * 2) - 1];

  462. 

  463.                             switch(correction_type_sp[lp2 & 0x01][k]) {

  464.                             case 0:

  465.                                 cur_lp[width_tbl[1]] = le2me_32(((le2me_32(*ref_lp) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

  466.                                 if(lp2 > 0 || flag1 == 0 || strip->ypos != 0)

  467.                                     cur_lp[0] = ((cur_lp[-width_tbl[1]] >> 1) + (cur_lp[width_tbl[1]] >> 1)) & 0xFEFEFEFE;

  468.                                 else

  469.                                     cur_lp[0] = le2me_32(((le2me_32(*ref_lp) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

  470.                                 lp2++;

  471.                                 break;

  472. 

  473.                             case 1:

  474.                                 res = ((le2me_16(((unsigned short *)ref_lp)[0]) >> 1) + correction_lp[lp2 & 0x01][*buf1]) << 1;

  475.                                 ((unsigned short *)cur_lp)[width_tbl[2]] = le2me_16(res);

  476.                                 res = ((le2me_16(((unsigned short *)ref_lp)[1]) >> 1) + correction_lp[lp2 & 0x01][k]) << 1;

  477.                                 ((unsigned short *)cur_lp)[width_tbl[2]+1] = le2me_16(res);

  478. 

  479.                                 if(lp2 > 0 || flag1 == 0 || strip->ypos != 0)

  480.                                     cur_lp[0] = ((cur_lp[-width_tbl[1]] >> 1) + (cur_lp[width_tbl[1]] >> 1)) & 0xFEFEFEFE;

  481.                                 else

  482.                                     cur_lp[0] = cur_lp[width_tbl[1]];

  483.                                 buf1++;

  484.                                 lp2++;

  485.                                 break;

  486. 

  487.                             case 2:

  488.                                 if(lp2 == 0) {

  489.                                     for(i = 0, j = 0; i < 4; i++, j += width_tbl[1])

  490.                                         cur_lp[j] = *ref_lp;

  491.                                     lp2 += 2;

  492.                                 }

  493.                                 break;

  494. 

  495.                             case 3:

  496.                                 if(lp2 < 2) {

  497.                                     for(i = 0, j = 0; i < 6 - (lp2 * 2); i++, j += width_tbl[1])

  498.                                         cur_lp[j] = *ref_lp;

  499.                                     lp2 = 3;

  500.                                 }

  501.                                 break;

  502. 

  503.                             case 6:

  504.                                 lp2 = 4;

  505.                                 break;

  506. 

  507.                             case 7:

  508.                                 if(rle_v3 != 0)

  509.                                     rle_v3 = 0;

  510.                                 else {

  511.                                     buf1--;

  512.                                     rle_v3 = 1;

  513.                                 }

  514.                                 lp2 = 4;

  515.                                 break;

  516. 

  517.                             case 8:

  518.                                 if(lp2 == 0) {

  519.                                     RLE_V3_CHECK(buf1,rle_v1,rle_v2,rle_v3)

  520. 

  521.                                     if(rle_v1 == 1) {

  522.                                         for(i = 0, j = 0; i < 8; i++, j += width_tbl[1])

  523.                                             cur_lp[j] = ref_lp[j];

  524.                                     }

  525. 

  526.                                     RLE_V2_CHECK(buf1,rle_v2, rle_v3,lp2)

  527.                                     break;

  528.                                 } else {

  529.                                     rle_v2 = (*buf1) - 1;

  530.                                     rle_v1 = 1;

  531.                                 }

  532.                             case 5:

  533.                                 LP2_CHECK(buf1,rle_v3,lp2)

  534.                             case 4:

  535.                                 for(i = 0, j = 0; i < 8 - (lp2 * 2); i++, j += width_tbl[1])

  536.                                     cur_lp[j] = *ref_lp;

  537.                                 lp2 = 4;

  538.                                 break;

  539. 

  540.                             case 9:

  541.                                 av_log(s->avctx, AV_LOG_ERROR, "UNTESTED.\n");

  542.                                 lv1 = *buf1++;

  543.                                 lv = (lv1 & 0x7F) << 1;

  544.                                 lv += (lv << 8);

  545.                                 lv += (lv << 16);

  546. 

  547.                                 for(i = 0, j = 0; i < 4; i++, j += width_tbl[1])

  548.                                     cur_lp[j] = lv;

  549. 

  550.                                 LV1_CHECK(buf1,rle_v3,lv1,lp2)

  551.                                 break;

  552. 

  553.                             default:

  554.                                 return;

  555.                             }

  556.                         }

  557. 

  558.                         cur_frm_pos += 4;

  559.                     }

  560. 

  561.                     cur_frm_pos += (((width * 2) - blks_width) * 4);

  562.                     flag1 = 0;

  563.                 }

  564.                 break;

  565. 

  566.             case 10:                    /********** CASE 10 **********/

  567.                 if(ref_vectors == NULL) {

  568.                     flag1 = 1;

  569. 

  570.                     for( ; blks_height > 0; blks_height -= 8) {

  571.                         for(lp1 = 0; lp1 < blks_width; lp1 += 2) {

  572.                             for(lp2 = 0; lp2 < 4; ) {

  573.                                 k = *buf1++;

  574.                                 cur_lp = ((uint32_t *)cur_frm_pos) + width_tbl[lp2 * 2];

  575.                                 ref_lp = ((uint32_t *)cur_frm_pos) + width_tbl[(lp2 * 2) - 1];

  576.                                 lv1 = ref_lp[0];

  577.                                 lv2 = ref_lp[1];

  578.                                 if(lp2 == 0 && flag1 != 0) {

  579. #if HAVE_BIGENDIAN

  580.                                     lv1 = lv1 & 0xFF00FF00;

  581.                                     lv1 = (lv1 >> 8) | lv1;

  582.                                     lv2 = lv2 & 0xFF00FF00;

  583.                                     lv2 = (lv2 >> 8) | lv2;

  584. #else

  585.                                     lv1 = lv1 & 0x00FF00FF;

  586.                                     lv1 = (lv1 << 8) | lv1;

  587.                                     lv2 = lv2 & 0x00FF00FF;

  588.                                     lv2 = (lv2 << 8) | lv2;

  589. #endif

  590.                                 }

  591. 

  592.                                 switch(correction_type_sp[lp2 & 0x01][k]) {

  593.                                 case 0:

  594.                                     cur_lp[width_tbl[1]] = le2me_32(((le2me_32(lv1) >> 1) + correctionloworder_lp[lp2 & 0x01][k]) << 1);

  595.                                     cur_lp[width_tbl[1]+1] = le2me_32(((le2me_32(lv2) >> 1) + correctionhighorder_lp[lp2 & 0x01][k]) << 1);

  596.                                     if(lp2 > 0 || strip->ypos != 0 || flag1 == 0) {

  597.                                         cur_lp[0] = ((cur_lp[-width_tbl[1]] >> 1) + (cur_lp[width_tbl[1]] >> 1)) & 0xFEFEFEFE;

  598.                                         cur_lp[1] = ((cur_lp[-width_tbl[1]+1] >> 1) + (cur_lp[width_tbl[1]+1] >> 1)) & 0xFEFEFEFE;

  599.                                     } else {

  600.                                         cur_lp[0] = cur_lp[width_tbl[1]];

  601.                                         cur_lp[1] = cur_lp[width_tbl[1]+1];

  602.                                     }

  603.                                     lp2++;

  604.                                     break;

  605. 

  606.                                 case 1:

  607.                                     cur_lp[width_tbl[1]] = le2me_32(((le2me_32(lv1) >> 1) + correctionloworder_lp[lp2 & 0x01][*buf1]) << 1);

  608.                                     cur_lp[width_tbl[1]+1] = le2me_32(((le2me_32(lv2) >> 1) + correctionloworder_lp[lp2 & 0x01][k]) << 1);

  609.                                     if(lp2 > 0 || strip->ypos != 0 || flag1 == 0) {

  610.                                         cur_lp[0] = ((cur_lp[-width_tbl[1]] >> 1) + (cur_lp[width_tbl[1]] >> 1)) & 0xFEFEFEFE;

  611.                                         cur_lp[1] = ((cur_lp[-width_tbl[1]+1] >> 1) + (cur_lp[width_tbl[1]+1] >> 1)) & 0xFEFEFEFE;

  612.                                     } else {

  613.                                         cur_lp[0] = cur_lp[width_tbl[1]];

  614.                                         cur_lp[1] = cur_lp[width_tbl[1]+1];

  615.                                     }

  616.                                     buf1++;

  617.                                     lp2++;

  618.                                     break;

  619. 

  620.                                 case 2:

  621.                                     if(lp2 == 0) {

  622.                                         if(flag1 != 0) {

  623.                                             for(i = 0, j = width_tbl[1]; i < 3; i++, j += width_tbl[1]) {

  624.                                                 cur_lp[j] = lv1;

  625.                                                 cur_lp[j+1] = lv2;

  626.                                             }

  627.                                             cur_lp[0] = ((cur_lp[-width_tbl[1]] >> 1) + (cur_lp[width_tbl[1]] >> 1)) & 0xFEFEFEFE;

  628.                                             cur_lp[1] = ((cur_lp[-width_tbl[1]+1] >> 1) + (cur_lp[width_tbl[1]+1] >> 1)) & 0xFEFEFEFE;

  629.                                         } else {

  630.                                             for(i = 0, j = 0; i < 4; i++, j += width_tbl[1]) {

  631.                                                 cur_lp[j] = lv1;

  632.                                                 cur_lp[j+1] = lv2;

  633.                                             }

  634.                                         }

  635.                                         lp2 += 2;

  636.                                     }

  637.                                     break;

  638. 

  639.                                 case 3:

  640.                                     if(lp2 < 2) {

  641.                                         if(lp2 == 0 && flag1 != 0) {

  642.                                             for(i = 0, j = width_tbl[1]; i < 5; i++, j += width_tbl[1]) {

  643.                                                 cur_lp[j] = lv1;

  644.                                                 cur_lp[j+1] = lv2;

  645.                                             }

  646.                                             cur_lp[0] = ((cur_lp[-width_tbl[1]] >> 1) + (cur_lp[width_tbl[1]] >> 1)) & 0xFEFEFEFE;

  647.                                             cur_lp[1] = ((cur_lp[-width_tbl[1]+1] >> 1) + (cur_lp[width_tbl[1]+1] >> 1)) & 0xFEFEFEFE;

  648.                                         } else {

  649.                                             for(i = 0, j = 0; i < 6 - (lp2 * 2); i++, j += width_tbl[1]) {

  650.                                                 cur_lp[j] = lv1;

  651.                                                 cur_lp[j+1] = lv2;

  652.                                             }

  653.                                         }

  654.                                         lp2 = 3;

  655.                                     }

  656.                                     break;

  657. 

  658.                                 case 8:

  659.                                     if(lp2 == 0) {

  660.                                         RLE_V3_CHECK(buf1,rle_v1,rle_v2,rle_v3)

  661.                                         if(rle_v1 == 1) {

  662.                                             if(flag1 != 0) {

  663.                                                 for(i = 0, j = width_tbl[1]; i < 7; i++, j += width_tbl[1]) {

  664.                                                     cur_lp[j] = lv1;

  665.                                                     cur_lp[j+1] = lv2;

  666.                                                 }

  667.                                                 cur_lp[0] = ((cur_lp[-width_tbl[1]] >> 1) + (cur_lp[width_tbl[1]] >> 1)) & 0xFEFEFEFE;

  668.                                                 cur_lp[1] = ((cur_lp[-width_tbl[1]+1] >> 1) + (cur_lp[width_tbl[1]+1] >> 1)) & 0xFEFEFEFE;

  669.                                             } else {

  670.                                                 for(i = 0, j = 0; i < 8; i++, j += width_tbl[1]) {

  671.                                                     cur_lp[j] = lv1;

  672.                                                     cur_lp[j+1] = lv2;

  673.                                                 }

  674.                                             }

  675.                                         }

  676.                                         RLE_V2_CHECK(buf1,rle_v2, rle_v3,lp2)

  677.                                         break;

  678.                                     } else {

  679.                                         rle_v1 = 1;

  680.                                         rle_v2 = (*buf1) - 1;

  681.                                     }

  682.                                 case 5:

  683.                                     LP2_CHECK(buf1,rle_v3,lp2)

  684.                                 case 4:

  685.                                     if(lp2 == 0 && flag1 != 0) {

  686.                                         for(i = 0, j = width_tbl[1]; i < 7; i++, j += width_tbl[1]) {

  687.                                             cur_lp[j] = lv1;

  688.                                             cur_lp[j+1] = lv2;

  689.                                         }

  690.                                         cur_lp[0] = ((cur_lp[-width_tbl[1]] >> 1) + (cur_lp[width_tbl[1]] >> 1)) & 0xFEFEFEFE;

  691.                                         cur_lp[1] = ((cur_lp[-width_tbl[1]+1] >> 1) + (cur_lp[width_tbl[1]+1] >> 1)) & 0xFEFEFEFE;

  692.                                     } else {

  693.                                         for(i = 0, j = 0; i < 8 - (lp2 * 2); i++, j += width_tbl[1]) {

  694.                                             cur_lp[j] = lv1;

  695.                                             cur_lp[j+1] = lv2;

  696.                                         }

  697.                                     }

  698.                                     lp2 = 4;

  699.                                     break;

  700. 

  701.                                 case 6:

  702.                                     lp2 = 4;

  703.                                     break;

  704. 

  705.                                 case 7:

  706.                                     if(lp2 == 0) {

  707.                                         if(rle_v3 != 0)

  708.                                             rle_v3 = 0;

  709.                                         else {

  710.                                             buf1--;

  711.                                             rle_v3 = 1;

  712.                                         }

  713.                                         lp2 = 4;

  714.                                     }

  715.                                     break;

  716. 

  717.                                 case 9:

  718.                                     av_log(s->avctx, AV_LOG_ERROR, "UNTESTED.\n");

  719.                                     lv1 = *buf1;

  720.                                     lv = (lv1 & 0x7F) << 1;

  721.                                     lv += (lv << 8);

  722.                                     lv += (lv << 16);

  723.                                     for(i = 0, j = 0; i < 8; i++, j += width_tbl[1])

  724.                                         cur_lp[j] = lv;

  725.                                     LV1_CHECK(buf1,rle_v3,lv1,lp2)

  726.                                     break;

  727. 

  728.                                 default:

  729.                                     return;

  730.                                 }

  731.                             }

  732. 

  733.                             cur_frm_pos += 8;

  734.                         }

  735. 

  736.                         cur_frm_pos += (((width * 2) - blks_width) * 4);

  737.                         flag1 = 0;

  738.                     }

  739.                 } else {

  740.                     for( ; blks_height > 0; blks_height -= 8) {

  741.                         for(lp1 = 0; lp1 < blks_width; lp1 += 2) {

  742.                             for(lp2 = 0; lp2 < 4; ) {

  743.                                 k = *buf1++;

  744.                                 cur_lp = ((uint32_t *)cur_frm_pos) + width_tbl[lp2 * 2];

  745.                                 ref_lp = ((uint32_t *)ref_frm_pos) + width_tbl[lp2 * 2];

  746. 

  747.                                 switch(correction_type_sp[lp2 & 0x01][k]) {

  748.                                 case 0:

  749.                                     lv1 = correctionloworder_lp[lp2 & 0x01][k];

  750.                                     lv2 = correctionhighorder_lp[lp2 & 0x01][k];

  751.                                     cur_lp[0] = le2me_32(((le2me_32(ref_lp[0]) >> 1) + lv1) << 1);

  752.                                     cur_lp[1] = le2me_32(((le2me_32(ref_lp[1]) >> 1) + lv2) << 1);

  753.                                     cur_lp[width_tbl[1]] = le2me_32(((le2me_32(ref_lp[width_tbl[1]]) >> 1) + lv1) << 1);

  754.                                     cur_lp[width_tbl[1]+1] = le2me_32(((le2me_32(ref_lp[width_tbl[1]+1]) >> 1) + lv2) << 1);

  755.                                     lp2++;

  756.                                     break;

  757. 

  758.                                 case 1:

  759.                                     lv1 = correctionloworder_lp[lp2 & 0x01][*buf1++];

  760.                                     lv2 = correctionloworder_lp[lp2 & 0x01][k];

  761.                                     cur_lp[0] = le2me_32(((le2me_32(ref_lp[0]) >> 1) + lv1) << 1);

  762.                                     cur_lp[1] = le2me_32(((le2me_32(ref_lp[1]) >> 1) + lv2) << 1);

  763.                                     cur_lp[width_tbl[1]] = le2me_32(((le2me_32(ref_lp[width_tbl[1]]) >> 1) + lv1) << 1);

  764.                                     cur_lp[width_tbl[1]+1] = le2me_32(((le2me_32(ref_lp[width_tbl[1]+1]) >> 1) + lv2) << 1);

  765.                                     lp2++;

  766.                                     break;

  767. 

  768.                                 case 2:

  769.                                     if(lp2 == 0) {

  770.                                         for(i = 0, j = 0; i < 4; i++, j += width_tbl[1]) {

  771.                                             cur_lp[j] = ref_lp[j];

  772.                                             cur_lp[j+1] = ref_lp[j+1];

  773.                                         }

  774.                                         lp2 += 2;

  775.                                     }

  776.                                     break;

  777. 

  778.                                 case 3:

  779.                                     if(lp2 < 2) {

  780.                                         for(i = 0, j = 0; i < 6 - (lp2 * 2); i++, j += width_tbl[1]) {

  781.                                             cur_lp[j] = ref_lp[j];

  782.                                             cur_lp[j+1] = ref_lp[j+1];

  783.                                         }

  784.                                         lp2 = 3;

  785.                                     }

  786.                                     break;

  787. 

  788.                                 case 8:

  789.                                     if(lp2 == 0) {

  790.                                         RLE_V3_CHECK(buf1,rle_v1,rle_v2,rle_v3)

  791.                                         for(i = 0, j = 0; i < 8; i++, j += width_tbl[1]) {

  792.                                             ((uint32_t *)cur_frm_pos)[j] = ((uint32_t *)ref_frm_pos)[j];

  793.                                             ((uint32_t *)cur_frm_pos)[j+1] = ((uint32_t *)ref_frm_pos)[j+1];

  794.                                         }

  795.                                         RLE_V2_CHECK(buf1,rle_v2, rle_v3,lp2)

  796.                                         break;

  797.                                     } else {

  798.                                         rle_v1 = 1;

  799.                                         rle_v2 = (*buf1) - 1;

  800.                                     }

  801.                                 case 5:

  802.                                 case 7:

  803.                                     LP2_CHECK(buf1,rle_v3,lp2)

  804.                                 case 6:

  805.                                 case 4:

  806.                                     for(i = 0, j = 0; i < 8 - (lp2 * 2); i++, j += width_tbl[1]) {

  807.                                         cur_lp[j] = ref_lp[j];

  808.                                         cur_lp[j+1] = ref_lp[j+1];

  809.                                     }

  810.                                     lp2 = 4;

  811.                                     break;

  812. 

  813.                                 case 9:

  814.                                     av_log(s->avctx, AV_LOG_ERROR, "UNTESTED.\n");

  815.                                     lv1 = *buf1;

  816.                                     lv = (lv1 & 0x7F) << 1;

  817.                                     lv += (lv << 8);

  818.                                     lv += (lv << 16);

  819.                                     for(i = 0, j = 0; i < 8; i++, j += width_tbl[1])

  820.                                         ((uint32_t *)cur_frm_pos)[j] = ((uint32_t *)cur_frm_pos)[j+1] = lv;

  821.                                     LV1_CHECK(buf1,rle_v3,lv1,lp2)

  822.                                     break;

  823. 

  824.                                 default:

  825.                                     return;

  826.                                 }

  827.                             }

  828. 

  829.                             cur_frm_pos += 8;

  830.                             ref_frm_pos += 8;

  831.                         }

  832. 

  833.                         cur_frm_pos += (((width * 2) - blks_width) * 4);

  834.                         ref_frm_pos += (((width * 2) - blks_width) * 4);

  835.                     }

  836.                 }

  837.                 break;

  838. 

  839.             case 11:                    /********** CASE 11 **********/

  840.                 if(ref_vectors == NULL)

  841.                     return;

  842. 

  843.                 for( ; blks_height > 0; blks_height -= 8) {

  844.                     for(lp1 = 0; lp1 < blks_width; lp1++) {

  845.                         for(lp2 = 0; lp2 < 4; ) {

  846.                             k = *buf1++;

  847.                             cur_lp = ((uint32_t *)cur_frm_pos) + width_tbl[lp2 * 2];

  848.                             ref_lp = ((uint32_t *)ref_frm_pos) + width_tbl[lp2 * 2];

  849. 

  850.                             switch(correction_type_sp[lp2 & 0x01][k]) {

  851.                             case 0:

  852.                                 cur_lp[0] = le2me_32(((le2me_32(*ref_lp) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

  853.                                 cur_lp[width_tbl[1]] = le2me_32(((le2me_32(ref_lp[width_tbl[1]]) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

  854.                                 lp2++;

  855.                                 break;

  856. 

  857.                             case 1:

  858.                                 lv1 = (unsigned short)(correction_lp[lp2 & 0x01][*buf1++]);

  859.                                 lv2 = (unsigned short)(correction_lp[lp2 & 0x01][k]);

  860.                                 res = (unsigned short)(((le2me_16(((unsigned short *)ref_lp)[0]) >> 1) + lv1) << 1);

  861.                                 ((unsigned short *)cur_lp)[0] = le2me_16(res);

  862.                                 res = (unsigned short)(((le2me_16(((unsigned short *)ref_lp)[1]) >> 1) + lv2) << 1);

  863.                                 ((unsigned short *)cur_lp)[1] = le2me_16(res);

  864.                                 res = (unsigned short)(((le2me_16(((unsigned short *)ref_lp)[width_tbl[2]]) >> 1) + lv1) << 1);

  865.                                 ((unsigned short *)cur_lp)[width_tbl[2]] = le2me_16(res);

  866.                                 res = (unsigned short)(((le2me_16(((unsigned short *)ref_lp)[width_tbl[2]+1]) >> 1) + lv2) << 1);

  867.                                 ((unsigned short *)cur_lp)[width_tbl[2]+1] = le2me_16(res);

  868.                                 lp2++;

  869.                                 break;

  870. 

  871.                             case 2:

  872.                                 if(lp2 == 0) {

  873.                                     for(i = 0, j = 0; i < 4; i++, j += width_tbl[1])

  874.                                         cur_lp[j] = ref_lp[j];

  875.                                     lp2 += 2;

  876.                                 }

  877.                                 break;

  878. 

  879.                             case 3:

  880.                                 if(lp2 < 2) {

  881.                                     for(i = 0, j = 0; i < 6 - (lp2 * 2); i++, j += width_tbl[1])

  882.                                         cur_lp[j] = ref_lp[j];

  883.                                     lp2 = 3;

  884.                                 }

  885.                                 break;

  886. 

  887.                             case 8:

  888.                                 if(lp2 == 0) {

  889.                                     RLE_V3_CHECK(buf1,rle_v1,rle_v2,rle_v3)

  890. 

  891.                                     for(i = 0, j = 0; i < 8; i++, j += width_tbl[1])

  892.                                         cur_lp[j] = ref_lp[j];

  893. 

  894.                                     RLE_V2_CHECK(buf1,rle_v2, rle_v3,lp2)

  895.                                     break;

  896.                                 } else {

  897.                                     rle_v1 = 1;

  898.                                     rle_v2 = (*buf1) - 1;

  899.                                 }

  900.                             case 5:

  901.                             case 7:

  902.                                 LP2_CHECK(buf1,rle_v3,lp2)

  903.                             case 4:

  904.                             case 6:

  905.                                 for(i = 0, j = 0; i < 8 - (lp2 * 2); i++, j += width_tbl[1])

  906.                                     cur_lp[j] = ref_lp[j];

  907.                                 lp2 = 4;

  908.                                 break;

  909. 

  910.                             case 9:

  911.                                 av_log(s->avctx, AV_LOG_ERROR, "UNTESTED.\n");

  912.                                 lv1 = *buf1++;

  913.                                 lv = (lv1 & 0x7F) << 1;

  914.                                 lv += (lv << 8);

  915.                                 lv += (lv << 16);

  916.                                 for(i = 0, j = 0; i < 4; i++, j += width_tbl[1])

  917.                                     cur_lp[j] = lv;

  918.                                 LV1_CHECK(buf1,rle_v3,lv1,lp2)

  919.                                 break;

  920. 

  921.                             default:

  922.                                 return;

  923.                             }

  924.                         }

  925. 

  926.                         cur_frm_pos += 4;

  927.                         ref_frm_pos += 4;

  928.                     }

  929. 

  930.                     cur_frm_pos += (((width * 2) - blks_width) * 4);

  931.                     ref_frm_pos += (((width * 2) - blks_width) * 4);

  932.                 }

  933.                 break;

  934. 

  935.             default:

  936.                 return;

  937.             }

  938.         }

  939. 

  940.         for( ; strip >= strip_tbl; strip--) {

  941.             if(strip->split_flag != 0) {

  942.                 strip->split_flag = 0;

  943.                 strip->usl7 = (strip-1)->usl7;

  944. 

  945.                 if(strip->split_direction) {

  946.                     strip->xpos += strip->width;

  947.                     strip->width = (strip-1)->width - strip->width;

  948.                     if(region_160_width <= strip->xpos && width < strip->width + strip->xpos)

  949.                         strip->width = width - strip->xpos;

  950.                 } else {

  951.                     strip->ypos += strip->height;

  952.                     strip->height = (strip-1)->height - strip->height;

  953.                 }

  954.                 break;

  955.             }

  956.         }

  957.     }

  958. }

  959. 

  960. static av_cold int indeo3_decode_init(AVCodecContext *avctx)

  961. {

  962.     Indeo3DecodeContext *s = avctx->priv_data;

  963.     int ret = 0;

  964. 

  965.     s->avctx = avctx;

  966.     s->width = avctx->width;

  967.     s->height = avctx->height;

  968.     avctx->pix_fmt = PIX_FMT_YUV410P;

  969. 

  970.     if (!(ret = build_modpred(s)))

  971.         ret = iv_alloc_frames(s);

  972.     if (ret)

  973.         iv_free_func(s);

  974. 

  975.     return ret;

  976. }

  977. 

  978. static int iv_decode_frame(AVCodecContext *avctx,

  979.                            const uint8_t *buf, int buf_size)

  980. {

  981.     Indeo3DecodeContext *s = avctx->priv_data;

  982.     unsigned int image_width, image_height,

  983.                  chroma_width, chroma_height;

  984.     unsigned long flags, cb_offset, data_size,

  985.                   y_offset, v_offset, u_offset, mc_vector_count;

  986.     const uint8_t *hdr_pos, *buf_pos;

  987. 

  988.     buf_pos = buf;

  989.     buf_pos += 18; /* skip OS header (16 bytes) and version number */

  990. 

  991.     flags = bytestream_get_le16(&buf_pos);

  992.     data_size = bytestream_get_le32(&buf_pos);

  993.     cb_offset = *buf_pos++;

  994.     buf_pos += 3; /* skip reserved byte and checksum */

  995.     image_height = bytestream_get_le16(&buf_pos);

  996.     image_width  = bytestream_get_le16(&buf_pos);

  997. 

  998.     if(avcodec_check_dimensions(avctx, image_width, image_height))

  999.         return -1;

  1000.     if (image_width != avctx->width || image_height != avctx->height) {

  1001.         int ret;

  1002.         avcodec_set_dimensions(avctx, image_width, image_height);

  1003.         s->width  = avctx->width;

  1004.         s->height = avctx->height;

  1005.         ret = iv_alloc_frames(s);

  1006.         if (ret < 0) {

  1007.             s->width = s->height = 0;

  1008.             return ret;

  1009.         }

  1010.     }

  1011. 

  1012.     chroma_height = ((image_height >> 2) + 3) & 0x7ffc;

  1013.     chroma_width = ((image_width >> 2) + 3) & 0x7ffc;

  1014.     y_offset = bytestream_get_le32(&buf_pos);

  1015.     v_offset = bytestream_get_le32(&buf_pos);

  1016.     u_offset = bytestream_get_le32(&buf_pos);

  1017.     buf_pos += 4; /* reserved */

  1018.     hdr_pos = buf_pos;

  1019.     if(data_size == 0x80) return 4;

  1020. 

  1021.     if(FFMAX3(y_offset, v_offset, u_offset) >= buf_size-16) {

  1022.         av_log(s->avctx, AV_LOG_ERROR, "y/u/v offset outside buffer\n");

  1023.         return -1;

  1024.     }

  1025. 

  1026.     if(flags & 0x200) {

  1027.         s->cur_frame = s->iv_frame + 1;

  1028.         s->ref_frame = s->iv_frame;

  1029.     } else {

  1030.         s->cur_frame = s->iv_frame;

  1031.         s->ref_frame = s->iv_frame + 1;

  1032.     }

  1033. 

  1034.     buf_pos = buf + 16 + y_offset;

  1035.     mc_vector_count = bytestream_get_le32(&buf_pos);

  1036.     if(2LL*mc_vector_count >= buf_size-16-y_offset) {

  1037.         av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1038.         return -1;

  1039.     }

  1040. 

  1041.     iv_Decode_Chunk(s, s->cur_frame->Ybuf, s->ref_frame->Ybuf, image_width,

  1042.                     image_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1043.                     FFMIN(image_width, 160));

  1044. 

  1045.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1046.     {

  1047. 

  1048.         buf_pos = buf + 16 + v_offset;

  1049.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1050.         if(2LL*mc_vector_count >= buf_size-16-v_offset) {

  1051.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1052.             return -1;

  1053.         }

  1054. 

  1055.         iv_Decode_Chunk(s, s->cur_frame->Vbuf, s->ref_frame->Vbuf, chroma_width,

  1056.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1057.                 FFMIN(chroma_width, 40));

  1058. 

  1059.         buf_pos = buf + 16 + u_offset;

  1060.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1061.         if(2LL*mc_vector_count >= buf_size-16-u_offset) {

  1062.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1063.             return -1;

  1064.         }

  1065. 

  1066.         iv_Decode_Chunk(s, s->cur_frame->Ubuf, s->ref_frame->Ubuf, chroma_width,

  1067.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1068.                 FFMIN(chroma_width, 40));

  1069. 

  1070.     }

  1071. 

  1072.     return 8;

  1073. }

  1074. 

  1075. static int indeo3_decode_frame(AVCodecContext *avctx,

  1076.                                void *data, int *data_size,

  1077.                                AVPacket *avpkt)

  1078. {

  1079.     const uint8_t *buf = avpkt->data;

  1080.     int buf_size = avpkt->size;

  1081.     Indeo3DecodeContext *s=avctx->priv_data;

  1082.     uint8_t *src, *dest;

  1083.     int y;

  1084. 

  1085.     if (iv_decode_frame(avctx, buf, buf_size) < 0)

  1086.         return -1;

  1087. 

  1088.     if(s->frame.data[0])

  1089.         avctx->release_buffer(avctx, &s->frame);

  1090. 

  1091.     s->frame.reference = 0;

  1092.     if(avctx->get_buffer(avctx, &s->frame) < 0) {

  1093.         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1094.         return -1;

  1095.     }

  1096. 

  1097.     src = s->cur_frame->Ybuf;

  1098.     dest = s->frame.data[0];

  1099.     for (y = 0; y < s->height; y++) {

  1100.         memcpy(dest, src, s->cur_frame->y_w);

  1101.         src += s->cur_frame->y_w;

  1102.         dest += s->frame.linesize[0];

  1103.     }

  1104. 

  1105.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1106.     {

  1107.         src = s->cur_frame->Ubuf;

  1108.         dest = s->frame.data[1];

  1109.         for (y = 0; y < s->height / 4; y++) {

  1110.             memcpy(dest, src, s->cur_frame->uv_w);

  1111.             src += s->cur_frame->uv_w;

  1112.             dest += s->frame.linesize[1];

  1113.         }

  1114. 

  1115.         src = s->cur_frame->Vbuf;

  1116.         dest = s->frame.data[2];

  1117.         for (y = 0; y < s->height / 4; y++) {

  1118.             memcpy(dest, src, s->cur_frame->uv_w);

  1119.             src += s->cur_frame->uv_w;

  1120.             dest += s->frame.linesize[2];

  1121.         }

  1122.     }

  1123. 

  1124.     *data_size=sizeof(AVFrame);

  1125.     *(AVFrame*)data= s->frame;

  1126. 

  1127.     return buf_size;

  1128. }

  1129. 

  1130. static av_cold int indeo3_decode_end(AVCodecContext *avctx)

  1131. {

  1132.     Indeo3DecodeContext *s = avctx->priv_data;

  1133. 

  1134.     iv_free_func(s);

  1135. 

  1136.     return 0;

  1137. }

  1138. 

  1139. AVCodec indeo3_decoder = {

  1140.     "indeo3",

  1141.     CODEC_TYPE_VIDEO,

  1142.     CODEC_ID_INDEO3,

  1143.     sizeof(Indeo3DecodeContext),

  1144.     indeo3_decode_init,

  1145.     NULL,

  1146.     indeo3_decode_end,

  1147.     indeo3_decode_frame,

  1148.     CODEC_CAP_DR1,

  1149.     NULL,

  1150.     .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),

  1151. };