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FFmpeg/libavcodec/indeo3.c

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  1. /*

  2.  * This file is part of FFmpeg.

  3.  *

  4.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; if not, write to the Free Software

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

  17.  */

  18. 

  19. /**

  20.  * @file

  21.  * Intel Indeo 3 (IV31, IV32, etc.) video decoder for FFmpeg

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

  23.  *

  24.  * For some documentation see:

  25.  * http://wiki.multimedia.cx/index.php?title=Indeo_3

  26.  */

  27. 

  28. #include <stdio.h>

  29. #include <stdlib.h>

  30. #include <string.h>

  31. 

  32. #include "libavutil/imgutils.h"

  33. #include "avcodec.h"

  34. #include "dsputil.h"

  35. #include "bytestream.h"

  36. 

  37. #include "indeo3data.h"

  38. 

  39. typedef struct

  40. {

  41.     uint8_t *Ybuf;

  42.     uint8_t *Ubuf;

  43.     uint8_t *Vbuf;

  44.     unsigned short y_w, y_h;

  45.     unsigned short uv_w, uv_h;

  46. } YUVBufs;

  47. 

  48. typedef struct Indeo3DecodeContext {

  49.     AVCodecContext *avctx;

  50.     int width, height;

  51.     AVFrame frame;

  52. 

  53.     uint8_t *buf;

  54.     YUVBufs iv_frame[2];

  55.     YUVBufs *cur_frame;

  56.     YUVBufs *ref_frame;

  57. 

  58.     uint8_t *ModPred;

  59.     uint8_t *corrector_type;

  60. } Indeo3DecodeContext;

  61. 

  62. static const uint8_t corrector_type_0[24] = {

  63.     195, 159, 133, 115, 101,  93,  87,  77,

  64.     195, 159, 133, 115, 101,  93,  87,  77,

  65.     128,  79,  79,  79,  79,  79,  79,  79

  66. };

  67. 

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

  69. 

  70. static av_cold int build_modpred(Indeo3DecodeContext *s)

  71. {

  72.     int i, j;

  73. 

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

  75.         return AVERROR(ENOMEM);

  76. 

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

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

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

  80.                               i == 119 ||

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

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

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

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

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

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

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

  88.     }

  89. 

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

  91.         return AVERROR(ENOMEM);

  92. 

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

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

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

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

  97.                                          corrector_type_2[j - 248];

  98.         }

  99.     }

  100. 

  101.   return 0;

  102. }

  103. 

  104. static av_cold int iv_alloc_frames(Indeo3DecodeContext *s)

  105. {

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

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

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

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

  110.         luma_pixels   = luma_width   * luma_height,

  111.         chroma_pixels = chroma_width * chroma_height,

  112.         i;

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

  114.                           (chroma_pixels   + chroma_width) * 4;

  115. 

  116.     av_freep(&s->buf);

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

  118.         return AVERROR(ENOMEM);

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

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

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

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

  123. 

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

  125.     i = luma_pixels + luma_width * 2;

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

  127.     i += (luma_pixels + luma_width);

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

  129.     i += (chroma_pixels + chroma_width);

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

  131.     i += (chroma_pixels + chroma_width);

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

  133.     i += (chroma_pixels + chroma_width);

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

  135. 

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

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

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

  139. 

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

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

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

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

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

  145.     }

  146. 

  147.     return 0;

  148. }

  149. 

  150. static av_cold void iv_free_func(Indeo3DecodeContext *s)

  151. {

  152.     av_freep(&s->buf);

  153.     av_freep(&s->ModPred);

  154.     av_freep(&s->corrector_type);

  155. }

  156. 

  157. struct ustr {

  158.     int xpos;

  159.     int ypos;

  160.     int width;

  161.     int height;

  162.     int split_flag;

  163.     int split_direction;

  164.     int usl7;

  165. };

  166. 

  167. 

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

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

  170.         if(rle_v3 != 0)                 \

  171.             rle_v3 = 0;                 \

  172.         else {                          \

  173.             rle_v3 = 1;                 \

  174.             buf1 -= 2;                  \

  175.         }                               \

  176.     }                                   \

  177.     lp2 = 4;

  178. 

  179. 

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

  181.     if(rle_v3 == 0) {                            \

  182.         rle_v2 = *buf1;                          \

  183.         rle_v1 = 1;                              \

  184.         if(rle_v2 > 32) {                        \

  185.             rle_v2 -= 32;                        \

  186.             rle_v1 = 0;                          \

  187.         }                                        \

  188.         rle_v3 = 1;                              \

  189.     }                                            \

  190.     buf1--;

  191. 

  192. 

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

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

  195.         rle_v3 = 0;                 \

  196.     else {                          \

  197.         buf1--;                     \

  198.         rle_v3 = 1;                 \

  199.     }

  200. 

  201. 

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

  203.     rle_v2--;                                 \

  204.     if(rle_v2 == 0) {                         \

  205.         rle_v3 = 0;                           \

  206.         buf1 += 2;                            \

  207.     }                                         \

  208.     lp2 = 4;

  209. 

  210. static void iv_Decode_Chunk(Indeo3DecodeContext *s,

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

  212.         const uint8_t *buf1, int cb_offset, const uint8_t *hdr,

  213.         const uint8_t *buf2, int min_width_160)

  214. {

  215.     uint8_t bit_buf;

  216.     unsigned int bit_pos, lv, lv1, lv2;

  217.     int *width_tbl, width_tbl_arr[10];

  218.     const signed char *ref_vectors;

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

  220.     uint32_t *cur_lp, *ref_lp;

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

  222.     uint8_t *correction_type_sp[2];

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

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

  225.         rle_v1, rle_v2, rle_v3;

  226.     unsigned short res;

  227. 

  228.     bit_buf = 0;

  229.     ref_vectors = NULL;

  230. 

  231.     width_tbl = width_tbl_arr + 1;

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

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

  234.         width_tbl[j] = i * j;

  235. 

  236.     strip = strip_tbl;

  237. 

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

  239. 

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

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

  242.     strip->height = height;

  243.     strip->split_direction = 0;

  244.     strip->split_flag = 0;

  245.     strip->usl7 = 0;

  246. 

  247.     bit_pos = 0;

  248. 

  249.     rle_v1 = rle_v2 = rle_v3 = 0;

  250. 

  251.     while(strip >= strip_tbl) {

  252.         if(bit_pos <= 0) {

  253.             bit_pos = 8;

  254.             bit_buf = *buf1++;

  255.         }

  256. 

  257.         bit_pos -= 2;

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

  259. 

  260.         if(cmd == 0) {

  261.             strip++;

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

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

  264.                 break;

  265.             }

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

  267.             strip->split_flag = 1;

  268.             strip->split_direction = 0;

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

  270.             continue;

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

  272.             strip++;

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

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

  275.                 break;

  276.             }

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

  278.             strip->split_flag = 1;

  279.             strip->split_direction = 1;

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

  281.             continue;

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

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

  284.                 strip->usl7 = 1;

  285.                 ref_vectors = NULL;

  286.                 continue;

  287.             }

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

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

  290.                 strip->usl7 = 1;

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

  292.                 buf1++;

  293.                 continue;

  294.             }

  295.         }

  296. 

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

  298. 

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

  300.             blks_width += 3;

  301.         blks_width >>= 2;

  302.         blks_height = strip->height;

  303. 

  304.         if(ref_vectors != NULL) {

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

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

  307.         } else

  308.             ref_frm_pos = cur_frm_pos - width_tbl[4];

  309. 

  310.         if(cmd == 2) {

  311.             if(bit_pos <= 0) {

  312.                 bit_pos = 8;

  313.                 bit_buf = *buf1++;

  314.             }

  315. 

  316.             bit_pos -= 2;

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

  318. 

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

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

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

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

  323.                     cur_frm_pos += 4;

  324.                     ref_frm_pos += 4;

  325.                 }

  326.             } else if(cmd != 1)

  327.                 return;

  328.         } else {

  329.             k = *buf1 >> 4;

  330.             j = *buf1 & 0x0f;

  331.             buf1++;

  332.             lv = j + cb_offset;

  333. 

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

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

  336.                 cp = ref_frm_pos;

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

  338.                     int v = *cp >> 1;

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

  340.                 }

  341.             }

  342. 

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

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

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

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

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

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

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

  350.             } else {

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

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

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

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

  355.             }

  356. 

  357.             switch(k) {

  358.             case 1:

  359.             case 0:                    /********** CASE 0 **********/

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

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

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

  363.                             k = *buf1++;

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

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

  366. 

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

  368.                             case 0:

  369.                                 *cur_lp = av_le2ne32(((av_le2ne32(*ref_lp) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

  370.                                 lp2++;

  371.                                 break;

  372.                             case 1:

  373.                                 res = ((av_le2ne16(((unsigned short *)(ref_lp))[0]) >> 1) + correction_lp[lp2 & 0x01][*buf1]) << 1;

  374.                                 ((unsigned short *)cur_lp)[0] = av_le2ne16(res);

  375.                                 res = ((av_le2ne16(((unsigned short *)(ref_lp))[1]) >> 1) + correction_lp[lp2 & 0x01][k]) << 1;

  376.                                 ((unsigned short *)cur_lp)[1] = av_le2ne16(res);

  377.                                 buf1++;

  378.                                 lp2++;

  379.                                 break;

  380.                             case 2:

  381.                                 if(lp2 == 0) {

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

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

  384.                                     lp2 += 2;

  385.                                 }

  386.                                 break;

  387.                             case 3:

  388.                                 if(lp2 < 2) {

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

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

  391.                                     lp2 = 3;

  392.                                 }

  393.                                 break;

  394.                             case 8:

  395.                                 if(lp2 == 0) {

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

  397. 

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

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

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

  401.                                     }

  402. 

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

  404.                                     break;

  405.                                 } else {

  406.                                     rle_v1 = 1;

  407.                                     rle_v2 = *buf1 - 1;

  408.                                 }

  409.                             case 5:

  410.                                 LP2_CHECK(buf1,rle_v3,lp2)

  411.                             case 4:

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

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

  414.                                 lp2 = 4;

  415.                                 break;

  416. 

  417.                             case 7:

  418.                                 if(rle_v3 != 0)

  419.                                     rle_v3 = 0;

  420.                                 else {

  421.                                     buf1--;

  422.                                     rle_v3 = 1;

  423.                                 }

  424.                             case 6:

  425.                                 if(ref_vectors != NULL) {

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

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

  428.                                 }

  429.                                 lp2 = 4;

  430.                                 break;

  431. 

  432.                             case 9:

  433.                                 lv1 = *buf1++;

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

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

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

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

  438.                                     cur_lp[j] = lv;

  439. 

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

  441.                                 break;

  442.                             default:

  443.                                 return;

  444.                             }

  445.                         }

  446. 

  447.                         cur_frm_pos += 4;

  448.                         ref_frm_pos += 4;

  449.                     }

  450. 

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

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

  453.                 }

  454.                 break;

  455. 

  456.             case 4:

  457.             case 3:                    /********** CASE 3 **********/

  458.                 if(ref_vectors != NULL)

  459.                     return;

  460.                 flag1 = 1;

  461. 

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

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

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

  465.                             k = *buf1++;

  466. 

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

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

  469. 

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

  471.                             case 0:

  472.                                 cur_lp[width_tbl[1]] = av_le2ne32(((av_le2ne32(*ref_lp) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

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

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

  475.                                 else

  476.                                     cur_lp[0] = av_le2ne32(((av_le2ne32(*ref_lp) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

  477.                                 lp2++;

  478.                                 break;

  479. 

  480.                             case 1:

  481.                                 res = ((av_le2ne16(((unsigned short *)ref_lp)[0]) >> 1) + correction_lp[lp2 & 0x01][*buf1]) << 1;

  482.                                 ((unsigned short *)cur_lp)[width_tbl[2]] = av_le2ne16(res);

  483.                                 res = ((av_le2ne16(((unsigned short *)ref_lp)[1]) >> 1) + correction_lp[lp2 & 0x01][k]) << 1;

  484.                                 ((unsigned short *)cur_lp)[width_tbl[2]+1] = av_le2ne16(res);

  485. 

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

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

  488.                                 else

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

  490.                                 buf1++;

  491.                                 lp2++;

  492.                                 break;

  493. 

  494.                             case 2:

  495.                                 if(lp2 == 0) {

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

  497.                                         cur_lp[j] = *ref_lp;

  498.                                     lp2 += 2;

  499.                                 }

  500.                                 break;

  501. 

  502.                             case 3:

  503.                                 if(lp2 < 2) {

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

  505.                                         cur_lp[j] = *ref_lp;

  506.                                     lp2 = 3;

  507.                                 }

  508.                                 break;

  509. 

  510.                             case 6:

  511.                                 lp2 = 4;

  512.                                 break;

  513. 

  514.                             case 7:

  515.                                 if(rle_v3 != 0)

  516.                                     rle_v3 = 0;

  517.                                 else {

  518.                                     buf1--;

  519.                                     rle_v3 = 1;

  520.                                 }

  521.                                 lp2 = 4;

  522.                                 break;

  523. 

  524.                             case 8:

  525.                                 if(lp2 == 0) {

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

  527. 

  528.                                     if(rle_v1 == 1) {

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

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

  531.                                     }

  532. 

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

  534.                                     break;

  535.                                 } else {

  536.                                     rle_v2 = (*buf1) - 1;

  537.                                     rle_v1 = 1;

  538.                                 }

  539.                             case 5:

  540.                                 LP2_CHECK(buf1,rle_v3,lp2)

  541.                             case 4:

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

  543.                                     cur_lp[j] = *ref_lp;

  544.                                 lp2 = 4;

  545.                                 break;

  546. 

  547.                             case 9:

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

  549.                                 lv1 = *buf1++;

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

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

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

  553. 

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

  555.                                     cur_lp[j] = lv;

  556. 

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

  558.                                 break;

  559. 

  560.                             default:

  561.                                 return;

  562.                             }

  563.                         }

  564. 

  565.                         cur_frm_pos += 4;

  566.                     }

  567. 

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

  569.                     flag1 = 0;

  570.                 }

  571.                 break;

  572. 

  573.             case 10:                    /********** CASE 10 **********/

  574.                 if(ref_vectors == NULL) {

  575.                     flag1 = 1;

  576. 

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

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

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

  580.                                 k = *buf1++;

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

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

  583.                                 lv1 = ref_lp[0];

  584.                                 lv2 = ref_lp[1];

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

  586. #if HAVE_BIGENDIAN

  587.                                     lv1 = lv1 & 0xFF00FF00;

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

  589.                                     lv2 = lv2 & 0xFF00FF00;

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

  591. #else

  592.                                     lv1 = lv1 & 0x00FF00FF;

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

  594.                                     lv2 = lv2 & 0x00FF00FF;

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

  596. #endif

  597.                                 }

  598. 

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

  600.                                 case 0:

  601.                                     cur_lp[width_tbl[1]] = av_le2ne32(((av_le2ne32(lv1) >> 1) + correctionloworder_lp[lp2 & 0x01][k]) << 1);

  602.                                     cur_lp[width_tbl[1]+1] = av_le2ne32(((av_le2ne32(lv2) >> 1) + correctionhighorder_lp[lp2 & 0x01][k]) << 1);

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

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

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

  606.                                     } else {

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

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

  609.                                     }

  610.                                     lp2++;

  611.                                     break;

  612. 

  613.                                 case 1:

  614.                                     cur_lp[width_tbl[1]] = av_le2ne32(((av_le2ne32(lv1) >> 1) + correctionloworder_lp[lp2 & 0x01][*buf1]) << 1);

  615.                                     cur_lp[width_tbl[1]+1] = av_le2ne32(((av_le2ne32(lv2) >> 1) + correctionloworder_lp[lp2 & 0x01][k]) << 1);

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

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

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

  619.                                     } else {

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

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

  622.                                     }

  623.                                     buf1++;

  624.                                     lp2++;

  625.                                     break;

  626. 

  627.                                 case 2:

  628.                                     if(lp2 == 0) {

  629.                                         if(flag1 != 0) {

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

  631.                                                 cur_lp[j] = lv1;

  632.                                                 cur_lp[j+1] = lv2;

  633.                                             }

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

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

  636.                                         } else {

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

  638.                                                 cur_lp[j] = lv1;

  639.                                                 cur_lp[j+1] = lv2;

  640.                                             }

  641.                                         }

  642.                                         lp2 += 2;

  643.                                     }

  644.                                     break;

  645. 

  646.                                 case 3:

  647.                                     if(lp2 < 2) {

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

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

  650.                                                 cur_lp[j] = lv1;

  651.                                                 cur_lp[j+1] = lv2;

  652.                                             }

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

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

  655.                                         } else {

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

  657.                                                 cur_lp[j] = lv1;

  658.                                                 cur_lp[j+1] = lv2;

  659.                                             }

  660.                                         }

  661.                                         lp2 = 3;

  662.                                     }

  663.                                     break;

  664. 

  665.                                 case 8:

  666.                                     if(lp2 == 0) {

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

  668.                                         if(rle_v1 == 1) {

  669.                                             if(flag1 != 0) {

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

  671.                                                     cur_lp[j] = lv1;

  672.                                                     cur_lp[j+1] = lv2;

  673.                                                 }

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

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

  676.                                             } else {

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

  678.                                                     cur_lp[j] = lv1;

  679.                                                     cur_lp[j+1] = lv2;

  680.                                                 }

  681.                                             }

  682.                                         }

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

  684.                                         break;

  685.                                     } else {

  686.                                         rle_v1 = 1;

  687.                                         rle_v2 = (*buf1) - 1;

  688.                                     }

  689.                                 case 5:

  690.                                     LP2_CHECK(buf1,rle_v3,lp2)

  691.                                 case 4:

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

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

  694.                                             cur_lp[j] = lv1;

  695.                                             cur_lp[j+1] = lv2;

  696.                                         }

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

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

  699.                                     } else {

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

  701.                                             cur_lp[j] = lv1;

  702.                                             cur_lp[j+1] = lv2;

  703.                                         }

  704.                                     }

  705.                                     lp2 = 4;

  706.                                     break;

  707. 

  708.                                 case 6:

  709.                                     lp2 = 4;

  710.                                     break;

  711. 

  712.                                 case 7:

  713.                                     if(lp2 == 0) {

  714.                                         if(rle_v3 != 0)

  715.                                             rle_v3 = 0;

  716.                                         else {

  717.                                             buf1--;

  718.                                             rle_v3 = 1;

  719.                                         }

  720.                                         lp2 = 4;

  721.                                     }

  722.                                     break;

  723. 

  724.                                 case 9:

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

  726.                                     lv1 = *buf1;

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

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

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

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

  731.                                         cur_lp[j] = lv;

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

  733.                                     break;

  734. 

  735.                                 default:

  736.                                     return;

  737.                                 }

  738.                             }

  739. 

  740.                             cur_frm_pos += 8;

  741.                         }

  742. 

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

  744.                         flag1 = 0;

  745.                     }

  746.                 } else {

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

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

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

  750.                                 k = *buf1++;

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

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

  753. 

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

  755.                                 case 0:

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

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

  758.                                     cur_lp[0] = av_le2ne32(((av_le2ne32(ref_lp[0]) >> 1) + lv1) << 1);

  759.                                     cur_lp[1] = av_le2ne32(((av_le2ne32(ref_lp[1]) >> 1) + lv2) << 1);

  760.                                     cur_lp[width_tbl[1]] = av_le2ne32(((av_le2ne32(ref_lp[width_tbl[1]]) >> 1) + lv1) << 1);

  761.                                     cur_lp[width_tbl[1]+1] = av_le2ne32(((av_le2ne32(ref_lp[width_tbl[1]+1]) >> 1) + lv2) << 1);

  762.                                     lp2++;

  763.                                     break;

  764. 

  765.                                 case 1:

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

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

  768.                                     cur_lp[0] = av_le2ne32(((av_le2ne32(ref_lp[0]) >> 1) + lv1) << 1);

  769.                                     cur_lp[1] = av_le2ne32(((av_le2ne32(ref_lp[1]) >> 1) + lv2) << 1);

  770.                                     cur_lp[width_tbl[1]] = av_le2ne32(((av_le2ne32(ref_lp[width_tbl[1]]) >> 1) + lv1) << 1);

  771.                                     cur_lp[width_tbl[1]+1] = av_le2ne32(((av_le2ne32(ref_lp[width_tbl[1]+1]) >> 1) + lv2) << 1);

  772.                                     lp2++;

  773.                                     break;

  774. 

  775.                                 case 2:

  776.                                     if(lp2 == 0) {

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

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

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

  780.                                         }

  781.                                         lp2 += 2;

  782.                                     }

  783.                                     break;

  784. 

  785.                                 case 3:

  786.                                     if(lp2 < 2) {

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

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

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

  790.                                         }

  791.                                         lp2 = 3;

  792.                                     }

  793.                                     break;

  794. 

  795.                                 case 8:

  796.                                     if(lp2 == 0) {

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

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

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

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

  801.                                         }

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

  803.                                         break;

  804.                                     } else {

  805.                                         rle_v1 = 1;

  806.                                         rle_v2 = (*buf1) - 1;

  807.                                     }

  808.                                 case 5:

  809.                                 case 7:

  810.                                     LP2_CHECK(buf1,rle_v3,lp2)

  811.                                 case 6:

  812.                                 case 4:

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

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

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

  816.                                     }

  817.                                     lp2 = 4;

  818.                                     break;

  819. 

  820.                                 case 9:

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

  822.                                     lv1 = *buf1;

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

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

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

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

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

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

  829.                                     break;

  830. 

  831.                                 default:

  832.                                     return;

  833.                                 }

  834.                             }

  835. 

  836.                             cur_frm_pos += 8;

  837.                             ref_frm_pos += 8;

  838.                         }

  839. 

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

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

  842.                     }

  843.                 }

  844.                 break;

  845. 

  846.             case 11:                    /********** CASE 11 **********/

  847.                 if(ref_vectors == NULL)

  848.                     return;

  849. 

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

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

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

  853.                             k = *buf1++;

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

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

  856. 

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

  858.                             case 0:

  859.                                 cur_lp[0] = av_le2ne32(((av_le2ne32(*ref_lp) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

  860.                                 cur_lp[width_tbl[1]] = av_le2ne32(((av_le2ne32(ref_lp[width_tbl[1]]) >> 1) + correction_lp[lp2 & 0x01][k]) << 1);

  861.                                 lp2++;

  862.                                 break;

  863. 

  864.                             case 1:

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

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

  867.                                 res = (unsigned short)(((av_le2ne16(((unsigned short *)ref_lp)[0]) >> 1) + lv1) << 1);

  868.                                 ((unsigned short *)cur_lp)[0] = av_le2ne16(res);

  869.                                 res = (unsigned short)(((av_le2ne16(((unsigned short *)ref_lp)[1]) >> 1) + lv2) << 1);

  870.                                 ((unsigned short *)cur_lp)[1] = av_le2ne16(res);

  871.                                 res = (unsigned short)(((av_le2ne16(((unsigned short *)ref_lp)[width_tbl[2]]) >> 1) + lv1) << 1);

  872.                                 ((unsigned short *)cur_lp)[width_tbl[2]] = av_le2ne16(res);

  873.                                 res = (unsigned short)(((av_le2ne16(((unsigned short *)ref_lp)[width_tbl[2]+1]) >> 1) + lv2) << 1);

  874.                                 ((unsigned short *)cur_lp)[width_tbl[2]+1] = av_le2ne16(res);

  875.                                 lp2++;

  876.                                 break;

  877. 

  878.                             case 2:

  879.                                 if(lp2 == 0) {

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

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

  882.                                     lp2 += 2;

  883.                                 }

  884.                                 break;

  885. 

  886.                             case 3:

  887.                                 if(lp2 < 2) {

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

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

  890.                                     lp2 = 3;

  891.                                 }

  892.                                 break;

  893. 

  894.                             case 8:

  895.                                 if(lp2 == 0) {

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

  897. 

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

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

  900. 

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

  902.                                     break;

  903.                                 } else {

  904.                                     rle_v1 = 1;

  905.                                     rle_v2 = (*buf1) - 1;

  906.                                 }

  907.                             case 5:

  908.                             case 7:

  909.                                 LP2_CHECK(buf1,rle_v3,lp2)

  910.                             case 4:

  911.                             case 6:

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

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

  914.                                 lp2 = 4;

  915.                                 break;

  916. 

  917.                             case 9:

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

  919.                                 lv1 = *buf1++;

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

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

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

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

  924.                                     cur_lp[j] = lv;

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

  926.                                 break;

  927. 

  928.                             default:

  929.                                 return;

  930.                             }

  931.                         }

  932. 

  933.                         cur_frm_pos += 4;

  934.                         ref_frm_pos += 4;

  935.                     }

  936. 

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

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

  939.                 }

  940.                 break;

  941. 

  942.             default:

  943.                 return;

  944.             }

  945.         }

  946. 

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

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

  949.                 strip->split_flag = 0;

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

  951. 

  952.                 if(strip->split_direction) {

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

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

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

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

  957.                 } else {

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

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

  960.                 }

  961.                 break;

  962.             }

  963.         }

  964.     }

  965. }

  966. 

  967. static av_cold int indeo3_decode_init(AVCodecContext *avctx)

  968. {

  969.     Indeo3DecodeContext *s = avctx->priv_data;

  970.     int ret = 0;

  971. 

  972.     s->avctx = avctx;

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

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

  975.     avctx->pix_fmt = PIX_FMT_YUV410P;

  976.     avcodec_get_frame_defaults(&s->frame);

  977. 

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

  979.         ret = iv_alloc_frames(s);

  980.     if (ret)

  981.         iv_free_func(s);

  982. 

  983.     return ret;

  984. }

  985. 

  986. static int iv_decode_frame(AVCodecContext *avctx,

  987.                            const uint8_t *buf, int buf_size)

  988. {

  989.     Indeo3DecodeContext *s = avctx->priv_data;

  990.     unsigned int image_width, image_height,

  991.                  chroma_width, chroma_height;

  992.     unsigned int flags, cb_offset, data_size,

  993.                   y_offset, v_offset, u_offset, mc_vector_count;

  994.     const uint8_t *hdr_pos, *buf_pos;

  995. 

  996.     buf_pos = buf;

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

  998. 

  999.     flags = bytestream_get_le16(&buf_pos);

  1000.     data_size = bytestream_get_le32(&buf_pos);

  1001.     cb_offset = *buf_pos++;

  1002.     buf_pos += 3; /* skip reserved byte and checksum */

  1003.     image_height = bytestream_get_le16(&buf_pos);

  1004.     image_width  = bytestream_get_le16(&buf_pos);

  1005. 

  1006.     if(av_image_check_size(image_width, image_height, 0, avctx))

  1007.         return -1;

  1008.     if (image_width != avctx->width || image_height != avctx->height) {

  1009.         int ret;

  1010.         avcodec_set_dimensions(avctx, image_width, image_height);

  1011.         s->width  = avctx->width;

  1012.         s->height = avctx->height;

  1013.         ret = iv_alloc_frames(s);

  1014.         if (ret < 0) {

  1015.             s->width = s->height = 0;

  1016.             return ret;

  1017.         }

  1018.     }

  1019. 

  1020.     chroma_height = ((image_height >> 2) + 3) & 0x7ffc;

  1021.     chroma_width = ((image_width >> 2) + 3) & 0x7ffc;

  1022.     y_offset = bytestream_get_le32(&buf_pos);

  1023.     v_offset = bytestream_get_le32(&buf_pos);

  1024.     u_offset = bytestream_get_le32(&buf_pos);

  1025.     buf_pos += 4; /* reserved */

  1026.     hdr_pos = buf_pos;

  1027.     if(data_size == 0x80) return 4;

  1028. 

  1029.     if(FFMAX3(y_offset, v_offset, u_offset) >= buf_size-16) {

  1030.         av_log(s->avctx, AV_LOG_ERROR, "y/u/v offset outside buffer\n");

  1031.         return -1;

  1032.     }

  1033. 

  1034.     if(flags & 0x200) {

  1035.         s->cur_frame = s->iv_frame + 1;

  1036.         s->ref_frame = s->iv_frame;

  1037.     } else {

  1038.         s->cur_frame = s->iv_frame;

  1039.         s->ref_frame = s->iv_frame + 1;

  1040.     }

  1041. 

  1042.     buf_pos = buf + 16 + y_offset;

  1043.     mc_vector_count = bytestream_get_le32(&buf_pos);

  1044.     if(2LL*mc_vector_count >= buf_size-16-y_offset) {

  1045.         av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1046.         return -1;

  1047.     }

  1048. 

  1049.     iv_Decode_Chunk(s, s->cur_frame->Ybuf, s->ref_frame->Ybuf, image_width,

  1050.                     image_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1051.                     FFMIN(image_width, 160));

  1052. 

  1053.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1054.     {

  1055. 

  1056.         buf_pos = buf + 16 + v_offset;

  1057.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1058.         if(2LL*mc_vector_count >= buf_size-16-v_offset) {

  1059.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1060.             return -1;

  1061.         }

  1062. 

  1063.         iv_Decode_Chunk(s, s->cur_frame->Vbuf, s->ref_frame->Vbuf, chroma_width,

  1064.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1065.                 FFMIN(chroma_width, 40));

  1066. 

  1067.         buf_pos = buf + 16 + u_offset;

  1068.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1069.         if(2LL*mc_vector_count >= buf_size-16-u_offset) {

  1070.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1071.             return -1;

  1072.         }

  1073. 

  1074.         iv_Decode_Chunk(s, s->cur_frame->Ubuf, s->ref_frame->Ubuf, chroma_width,

  1075.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1076.                 FFMIN(chroma_width, 40));

  1077. 

  1078.     }

  1079. 

  1080.     return 8;

  1081. }

  1082. 

  1083. static int indeo3_decode_frame(AVCodecContext *avctx,

  1084.                                void *data, int *data_size,

  1085.                                AVPacket *avpkt)

  1086. {

  1087.     const uint8_t *buf = avpkt->data;

  1088.     int buf_size = avpkt->size;

  1089.     Indeo3DecodeContext *s=avctx->priv_data;

  1090.     uint8_t *src, *dest;

  1091.     int y;

  1092. 

  1093.     if (iv_decode_frame(avctx, buf, buf_size) < 0)

  1094.         return -1;

  1095. 

  1096.     if(s->frame.data[0])

  1097.         avctx->release_buffer(avctx, &s->frame);

  1098. 

  1099.     s->frame.reference = 0;

  1100.     if(avctx->get_buffer(avctx, &s->frame) < 0) {

  1101.         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1102.         return -1;

  1103.     }

  1104. 

  1105.     src = s->cur_frame->Ybuf;

  1106.     dest = s->frame.data[0];

  1107.     for (y = 0; y < s->height; y++) {

  1108.         memcpy(dest, src, s->cur_frame->y_w);

  1109.         src += s->cur_frame->y_w;

  1110.         dest += s->frame.linesize[0];

  1111.     }

  1112. 

  1113.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1114.     {

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

  1116.         dest = s->frame.data[1];

  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[1];

  1121.         }

  1122. 

  1123.         src = s->cur_frame->Vbuf;

  1124.         dest = s->frame.data[2];

  1125.         for (y = 0; y < s->height / 4; y++) {

  1126.             memcpy(dest, src, s->cur_frame->uv_w);

  1127.             src += s->cur_frame->uv_w;

  1128.             dest += s->frame.linesize[2];

  1129.         }

  1130.     }

  1131. 

  1132.     *data_size=sizeof(AVFrame);

  1133.     *(AVFrame*)data= s->frame;

  1134. 

  1135.     return buf_size;

  1136. }

  1137. 

  1138. static av_cold int indeo3_decode_end(AVCodecContext *avctx)

  1139. {

  1140.     Indeo3DecodeContext *s = avctx->priv_data;

  1141. 

  1142.     iv_free_func(s);

  1143. 

  1144.     return 0;

  1145. }

  1146. 

  1147. AVCodec ff_indeo3_decoder = {

  1148.     "indeo3",

  1149.     AVMEDIA_TYPE_VIDEO,

  1150.     CODEC_ID_INDEO3,

  1151.     sizeof(Indeo3DecodeContext),

  1152.     indeo3_decode_init,

  1153.     NULL,

  1154.     indeo3_decode_end,

  1155.     indeo3_decode_frame,

  1156.     CODEC_CAP_DR1,

  1157.     NULL,

  1158.     .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),

  1159. };