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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 "libavutil/imgutils.h"

  29. #include "avcodec.h"

  30. #include "dsputil.h"

  31. #include "bytestream.h"

  32. 

  33. #include "indeo3data.h"

  34. 

  35. typedef struct

  36. {

  37.     uint8_t *Ybuf;

  38.     uint8_t *Ubuf;

  39.     uint8_t *Vbuf;

  40.     unsigned short y_w, y_h;

  41.     unsigned short uv_w, uv_h;

  42. } YUVBufs;

  43. 

  44. typedef struct Indeo3DecodeContext {

  45.     AVCodecContext *avctx;

  46.     int width, height;

  47.     AVFrame frame;

  48. 

  49.     uint8_t *buf;

  50.     YUVBufs iv_frame[2];

  51.     YUVBufs *cur_frame;

  52.     YUVBufs *ref_frame;

  53. 

  54.     uint8_t *ModPred;

  55.     uint8_t *corrector_type;

  56. } Indeo3DecodeContext;

  57. 

  58. static const uint8_t corrector_type_0[24] = {

  59.     195, 159, 133, 115, 101,  93,  87,  77,

  60.     195, 159, 133, 115, 101,  93,  87,  77,

  61.     128,  79,  79,  79,  79,  79,  79,  79

  62. };

  63. 

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

  65. 

  66. static av_cold int build_modpred(Indeo3DecodeContext *s)

  67. {

  68.     int i, j;

  69. 

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

  71.         return AVERROR(ENOMEM);

  72. 

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

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

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

  76.                               i == 119 ||

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

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

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

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

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

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

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

  84.     }

  85. 

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

  87.         return AVERROR(ENOMEM);

  88. 

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

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

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

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

  93.                                          corrector_type_2[j - 248];

  94.         }

  95.     }

  96. 

  97.   return 0;

  98. }

  99. 

  100. static av_cold int iv_alloc_frames(Indeo3DecodeContext *s)

  101. {

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

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

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

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

  106.         luma_pixels   = luma_width   * luma_height,

  107.         chroma_pixels = chroma_width * chroma_height,

  108.         i;

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

  110.                           (chroma_pixels   + chroma_width) * 4;

  111. 

  112.     av_freep(&s->buf);

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

  114.         return AVERROR(ENOMEM);

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

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

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

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

  119. 

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

  121.     i = luma_pixels + luma_width * 2;

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

  123.     i += (luma_pixels + luma_width);

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

  125.     i += (chroma_pixels + chroma_width);

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

  127.     i += (chroma_pixels + chroma_width);

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

  129.     i += (chroma_pixels + chroma_width);

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

  131. 

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

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

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

  135. 

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

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

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

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

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

  141.     }

  142. 

  143.     return 0;

  144. }

  145. 

  146. static av_cold void iv_free_func(Indeo3DecodeContext *s)

  147. {

  148.     av_freep(&s->buf);

  149.     av_freep(&s->ModPred);

  150.     av_freep(&s->corrector_type);

  151. }

  152. 

  153. struct ustr {

  154.     int xpos;

  155.     int ypos;

  156.     int width;

  157.     int height;

  158.     int split_flag;

  159.     int split_direction;

  160.     int usl7;

  161. };

  162. 

  163. 

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

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

  166.         if(rle_v3 != 0)                 \

  167.             rle_v3 = 0;                 \

  168.         else {                          \

  169.             rle_v3 = 1;                 \

  170.             buf1 -= 2;                  \

  171.         }                               \

  172.     }                                   \

  173.     lp2 = 4;

  174. 

  175. 

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

  177.     if(rle_v3 == 0) {                            \

  178.         rle_v2 = *buf1;                          \

  179.         rle_v1 = 1;                              \

  180.         if(rle_v2 > 32) {                        \

  181.             rle_v2 -= 32;                        \

  182.             rle_v1 = 0;                          \

  183.         }                                        \

  184.         rle_v3 = 1;                              \

  185.     }                                            \

  186.     buf1--;

  187. 

  188. 

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

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

  191.         rle_v3 = 0;                 \

  192.     else {                          \

  193.         buf1--;                     \

  194.         rle_v3 = 1;                 \

  195.     }

  196. 

  197. 

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

  199.     rle_v2--;                                 \

  200.     if(rle_v2 == 0) {                         \

  201.         rle_v3 = 0;                           \

  202.         buf1 += 2;                            \

  203.     }                                         \

  204.     lp2 = 4;

  205. 

  206. static void iv_Decode_Chunk(Indeo3DecodeContext *s,

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

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

  209.         const uint8_t *buf2, int min_width_160)

  210. {

  211.     uint8_t bit_buf;

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

  213.     int *width_tbl, width_tbl_arr[10];

  214.     const signed char *ref_vectors;

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

  216.     uint32_t *cur_lp, *ref_lp;

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

  218.     uint8_t *correction_type_sp[2];

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

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

  221.         rle_v1, rle_v2, rle_v3;

  222.     unsigned short res;

  223. 

  224.     bit_buf = 0;

  225.     ref_vectors = NULL;

  226. 

  227.     width_tbl = width_tbl_arr + 1;

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

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

  230.         width_tbl[j] = i * j;

  231. 

  232.     strip = strip_tbl;

  233. 

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

  235. 

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

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

  238.     strip->height = height;

  239.     strip->split_direction = 0;

  240.     strip->split_flag = 0;

  241.     strip->usl7 = 0;

  242. 

  243.     bit_pos = 0;

  244. 

  245.     rle_v1 = rle_v2 = rle_v3 = 0;

  246. 

  247.     while(strip >= strip_tbl) {

  248.         if(bit_pos <= 0) {

  249.             bit_pos = 8;

  250.             bit_buf = *buf1++;

  251.         }

  252. 

  253.         bit_pos -= 2;

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

  255. 

  256.         if(cmd == 0) {

  257.             strip++;

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

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

  260.                 break;

  261.             }

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

  263.             strip->split_flag = 1;

  264.             strip->split_direction = 0;

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

  266.             continue;

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

  268.             strip++;

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

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

  271.                 break;

  272.             }

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

  274.             strip->split_flag = 1;

  275.             strip->split_direction = 1;

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

  277.             continue;

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

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

  280.                 strip->usl7 = 1;

  281.                 ref_vectors = NULL;

  282.                 continue;

  283.             }

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

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

  286.                 strip->usl7 = 1;

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

  288.                 buf1++;

  289.                 continue;

  290.             }

  291.         }

  292. 

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

  294. 

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

  296.             blks_width += 3;

  297.         blks_width >>= 2;

  298.         blks_height = strip->height;

  299. 

  300.         if(ref_vectors != NULL) {

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

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

  303.         } else

  304.             ref_frm_pos = cur_frm_pos - width_tbl[4];

  305. 

  306.         if(cmd == 2) {

  307.             if(bit_pos <= 0) {

  308.                 bit_pos = 8;

  309.                 bit_buf = *buf1++;

  310.             }

  311. 

  312.             bit_pos -= 2;

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

  314. 

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

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

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

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

  319.                     cur_frm_pos += 4;

  320.                     ref_frm_pos += 4;

  321.                 }

  322.             } else if(cmd != 1)

  323.                 return;

  324.         } else {

  325.             k = *buf1 >> 4;

  326.             j = *buf1 & 0x0f;

  327.             buf1++;

  328.             lv = j + cb_offset;

  329. 

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

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

  332.                 cp = ref_frm_pos;

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

  334.                     int v = *cp >> 1;

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

  336.                 }

  337.             }

  338. 

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

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

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

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

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

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

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

  346.             } else {

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

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

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

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

  351.             }

  352. 

  353.             switch(k) {

  354.             case 1:

  355.             case 0:                    /********** CASE 0 **********/

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

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

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

  359.                             k = *buf1++;

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

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

  362. 

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

  364.                             case 0:

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

  366.                                 lp2++;

  367.                                 break;

  368.                             case 1:

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

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

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

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

  373.                                 buf1++;

  374.                                 lp2++;

  375.                                 break;

  376.                             case 2:

  377.                                 if(lp2 == 0) {

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

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

  380.                                     lp2 += 2;

  381.                                 }

  382.                                 break;

  383.                             case 3:

  384.                                 if(lp2 < 2) {

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

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

  387.                                     lp2 = 3;

  388.                                 }

  389.                                 break;

  390.                             case 8:

  391.                                 if(lp2 == 0) {

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

  393. 

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

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

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

  397.                                     }

  398. 

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

  400.                                     break;

  401.                                 } else {

  402.                                     rle_v1 = 1;

  403.                                     rle_v2 = *buf1 - 1;

  404.                                 }

  405.                             case 5:

  406.                                 LP2_CHECK(buf1,rle_v3,lp2)

  407.                             case 4:

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

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

  410.                                 lp2 = 4;

  411.                                 break;

  412. 

  413.                             case 7:

  414.                                 if(rle_v3 != 0)

  415.                                     rle_v3 = 0;

  416.                                 else {

  417.                                     buf1--;

  418.                                     rle_v3 = 1;

  419.                                 }

  420.                             case 6:

  421.                                 if(ref_vectors != NULL) {

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

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

  424.                                 }

  425.                                 lp2 = 4;

  426.                                 break;

  427. 

  428.                             case 9:

  429.                                 lv1 = *buf1++;

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

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

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

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

  434.                                     cur_lp[j] = lv;

  435. 

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

  437.                                 break;

  438.                             default:

  439.                                 return;

  440.                             }

  441.                         }

  442. 

  443.                         cur_frm_pos += 4;

  444.                         ref_frm_pos += 4;

  445.                     }

  446. 

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

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

  449.                 }

  450.                 break;

  451. 

  452.             case 4:

  453.             case 3:                    /********** CASE 3 **********/

  454.                 if(ref_vectors != NULL)

  455.                     return;

  456.                 flag1 = 1;

  457. 

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

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

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

  461.                             k = *buf1++;

  462. 

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

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

  465. 

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

  467.                             case 0:

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

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

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

  471.                                 else

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

  473.                                 lp2++;

  474.                                 break;

  475. 

  476.                             case 1:

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

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

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

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

  481. 

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

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

  484.                                 else

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

  486.                                 buf1++;

  487.                                 lp2++;

  488.                                 break;

  489. 

  490.                             case 2:

  491.                                 if(lp2 == 0) {

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

  493.                                         cur_lp[j] = *ref_lp;

  494.                                     lp2 += 2;

  495.                                 }

  496.                                 break;

  497. 

  498.                             case 3:

  499.                                 if(lp2 < 2) {

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

  501.                                         cur_lp[j] = *ref_lp;

  502.                                     lp2 = 3;

  503.                                 }

  504.                                 break;

  505. 

  506.                             case 6:

  507.                                 lp2 = 4;

  508.                                 break;

  509. 

  510.                             case 7:

  511.                                 if(rle_v3 != 0)

  512.                                     rle_v3 = 0;

  513.                                 else {

  514.                                     buf1--;

  515.                                     rle_v3 = 1;

  516.                                 }

  517.                                 lp2 = 4;

  518.                                 break;

  519. 

  520.                             case 8:

  521.                                 if(lp2 == 0) {

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

  523. 

  524.                                     if(rle_v1 == 1) {

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

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

  527.                                     }

  528. 

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

  530.                                     break;

  531.                                 } else {

  532.                                     rle_v2 = (*buf1) - 1;

  533.                                     rle_v1 = 1;

  534.                                 }

  535.                             case 5:

  536.                                 LP2_CHECK(buf1,rle_v3,lp2)

  537.                             case 4:

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

  539.                                     cur_lp[j] = *ref_lp;

  540.                                 lp2 = 4;

  541.                                 break;

  542. 

  543.                             case 9:

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

  545.                                 lv1 = *buf1++;

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

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

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

  549. 

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

  551.                                     cur_lp[j] = lv;

  552. 

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

  554.                                 break;

  555. 

  556.                             default:

  557.                                 return;

  558.                             }

  559.                         }

  560. 

  561.                         cur_frm_pos += 4;

  562.                     }

  563. 

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

  565.                     flag1 = 0;

  566.                 }

  567.                 break;

  568. 

  569.             case 10:                    /********** CASE 10 **********/

  570.                 if(ref_vectors == NULL) {

  571.                     flag1 = 1;

  572. 

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

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

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

  576.                                 k = *buf1++;

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

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

  579.                                 lv1 = ref_lp[0];

  580.                                 lv2 = ref_lp[1];

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

  582. #if HAVE_BIGENDIAN

  583.                                     lv1 = lv1 & 0xFF00FF00;

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

  585.                                     lv2 = lv2 & 0xFF00FF00;

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

  587. #else

  588.                                     lv1 = lv1 & 0x00FF00FF;

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

  590.                                     lv2 = lv2 & 0x00FF00FF;

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

  592. #endif

  593.                                 }

  594. 

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

  596.                                 case 0:

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

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

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

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

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

  602.                                     } else {

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

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

  605.                                     }

  606.                                     lp2++;

  607.                                     break;

  608. 

  609.                                 case 1:

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

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

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

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

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

  615.                                     } else {

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

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

  618.                                     }

  619.                                     buf1++;

  620.                                     lp2++;

  621.                                     break;

  622. 

  623.                                 case 2:

  624.                                     if(lp2 == 0) {

  625.                                         if(flag1 != 0) {

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

  627.                                                 cur_lp[j] = lv1;

  628.                                                 cur_lp[j+1] = lv2;

  629.                                             }

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

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

  632.                                         } else {

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

  634.                                                 cur_lp[j] = lv1;

  635.                                                 cur_lp[j+1] = lv2;

  636.                                             }

  637.                                         }

  638.                                         lp2 += 2;

  639.                                     }

  640.                                     break;

  641. 

  642.                                 case 3:

  643.                                     if(lp2 < 2) {

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

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

  646.                                                 cur_lp[j] = lv1;

  647.                                                 cur_lp[j+1] = lv2;

  648.                                             }

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

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

  651.                                         } else {

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

  653.                                                 cur_lp[j] = lv1;

  654.                                                 cur_lp[j+1] = lv2;

  655.                                             }

  656.                                         }

  657.                                         lp2 = 3;

  658.                                     }

  659.                                     break;

  660. 

  661.                                 case 8:

  662.                                     if(lp2 == 0) {

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

  664.                                         if(rle_v1 == 1) {

  665.                                             if(flag1 != 0) {

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

  667.                                                     cur_lp[j] = lv1;

  668.                                                     cur_lp[j+1] = lv2;

  669.                                                 }

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

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

  672.                                             } else {

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

  674.                                                     cur_lp[j] = lv1;

  675.                                                     cur_lp[j+1] = lv2;

  676.                                                 }

  677.                                             }

  678.                                         }

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

  680.                                         break;

  681.                                     } else {

  682.                                         rle_v1 = 1;

  683.                                         rle_v2 = (*buf1) - 1;

  684.                                     }

  685.                                 case 5:

  686.                                     LP2_CHECK(buf1,rle_v3,lp2)

  687.                                 case 4:

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

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

  690.                                             cur_lp[j] = lv1;

  691.                                             cur_lp[j+1] = lv2;

  692.                                         }

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

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

  695.                                     } else {

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

  697.                                             cur_lp[j] = lv1;

  698.                                             cur_lp[j+1] = lv2;

  699.                                         }

  700.                                     }

  701.                                     lp2 = 4;

  702.                                     break;

  703. 

  704.                                 case 6:

  705.                                     lp2 = 4;

  706.                                     break;

  707. 

  708.                                 case 7:

  709.                                     if(lp2 == 0) {

  710.                                         if(rle_v3 != 0)

  711.                                             rle_v3 = 0;

  712.                                         else {

  713.                                             buf1--;

  714.                                             rle_v3 = 1;

  715.                                         }

  716.                                         lp2 = 4;

  717.                                     }

  718.                                     break;

  719. 

  720.                                 case 9:

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

  722.                                     lv1 = *buf1;

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

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

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

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

  727.                                         cur_lp[j] = lv;

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

  729.                                     break;

  730. 

  731.                                 default:

  732.                                     return;

  733.                                 }

  734.                             }

  735. 

  736.                             cur_frm_pos += 8;

  737.                         }

  738. 

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

  740.                         flag1 = 0;

  741.                     }

  742.                 } else {

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

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

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

  746.                                 k = *buf1++;

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

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

  749. 

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

  751.                                 case 0:

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

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

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

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

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

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

  758.                                     lp2++;

  759.                                     break;

  760. 

  761.                                 case 1:

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

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

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

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

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

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

  768.                                     lp2++;

  769.                                     break;

  770. 

  771.                                 case 2:

  772.                                     if(lp2 == 0) {

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

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

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

  776.                                         }

  777.                                         lp2 += 2;

  778.                                     }

  779.                                     break;

  780. 

  781.                                 case 3:

  782.                                     if(lp2 < 2) {

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

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

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

  786.                                         }

  787.                                         lp2 = 3;

  788.                                     }

  789.                                     break;

  790. 

  791.                                 case 8:

  792.                                     if(lp2 == 0) {

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

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

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

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

  797.                                         }

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

  799.                                         break;

  800.                                     } else {

  801.                                         rle_v1 = 1;

  802.                                         rle_v2 = (*buf1) - 1;

  803.                                     }

  804.                                 case 5:

  805.                                 case 7:

  806.                                     LP2_CHECK(buf1,rle_v3,lp2)

  807.                                 case 6:

  808.                                 case 4:

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

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

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

  812.                                     }

  813.                                     lp2 = 4;

  814.                                     break;

  815. 

  816.                                 case 9:

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

  818.                                     lv1 = *buf1;

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

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

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

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

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

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

  825.                                     break;

  826. 

  827.                                 default:

  828.                                     return;

  829.                                 }

  830.                             }

  831. 

  832.                             cur_frm_pos += 8;

  833.                             ref_frm_pos += 8;

  834.                         }

  835. 

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

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

  838.                     }

  839.                 }

  840.                 break;

  841. 

  842.             case 11:                    /********** CASE 11 **********/

  843.                 if(ref_vectors == NULL)

  844.                     return;

  845. 

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

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

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

  849.                             k = *buf1++;

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

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

  852. 

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

  854.                             case 0:

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

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

  857.                                 lp2++;

  858.                                 break;

  859. 

  860.                             case 1:

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

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

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

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

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

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

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

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

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

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

  871.                                 lp2++;

  872.                                 break;

  873. 

  874.                             case 2:

  875.                                 if(lp2 == 0) {

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

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

  878.                                     lp2 += 2;

  879.                                 }

  880.                                 break;

  881. 

  882.                             case 3:

  883.                                 if(lp2 < 2) {

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

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

  886.                                     lp2 = 3;

  887.                                 }

  888.                                 break;

  889. 

  890.                             case 8:

  891.                                 if(lp2 == 0) {

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

  893. 

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

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

  896. 

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

  898.                                     break;

  899.                                 } else {

  900.                                     rle_v1 = 1;

  901.                                     rle_v2 = (*buf1) - 1;

  902.                                 }

  903.                             case 5:

  904.                             case 7:

  905.                                 LP2_CHECK(buf1,rle_v3,lp2)

  906.                             case 4:

  907.                             case 6:

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

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

  910.                                 lp2 = 4;

  911.                                 break;

  912. 

  913.                             case 9:

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

  915.                                 lv1 = *buf1++;

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

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

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

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

  920.                                     cur_lp[j] = lv;

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

  922.                                 break;

  923. 

  924.                             default:

  925.                                 return;

  926.                             }

  927.                         }

  928. 

  929.                         cur_frm_pos += 4;

  930.                         ref_frm_pos += 4;

  931.                     }

  932. 

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

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

  935.                 }

  936.                 break;

  937. 

  938.             default:

  939.                 return;

  940.             }

  941.         }

  942. 

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

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

  945.                 strip->split_flag = 0;

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

  947. 

  948.                 if(strip->split_direction) {

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

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

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

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

  953.                 } else {

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

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

  956.                 }

  957.                 break;

  958.             }

  959.         }

  960.     }

  961. }

  962. 

  963. static av_cold int indeo3_decode_init(AVCodecContext *avctx)

  964. {

  965.     Indeo3DecodeContext *s = avctx->priv_data;

  966.     int ret = 0;

  967. 

  968.     s->avctx = avctx;

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

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

  971.     avctx->pix_fmt = PIX_FMT_YUV410P;

  972.     avcodec_get_frame_defaults(&s->frame);

  973. 

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

  975.         ret = iv_alloc_frames(s);

  976.     if (ret)

  977.         iv_free_func(s);

  978. 

  979.     return ret;

  980. }

  981. 

  982. static int iv_decode_frame(AVCodecContext *avctx,

  983.                            const uint8_t *buf, int buf_size)

  984. {

  985.     Indeo3DecodeContext *s = avctx->priv_data;

  986.     unsigned int image_width, image_height,

  987.                  chroma_width, chroma_height;

  988.     unsigned int flags, cb_offset, data_size,

  989.                   y_offset, v_offset, u_offset, mc_vector_count;

  990.     const uint8_t *hdr_pos, *buf_pos;

  991. 

  992.     buf_pos = buf;

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

  994. 

  995.     flags = bytestream_get_le16(&buf_pos);

  996.     data_size = bytestream_get_le32(&buf_pos);

  997.     cb_offset = *buf_pos++;

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

  999.     image_height = bytestream_get_le16(&buf_pos);

  1000.     image_width  = bytestream_get_le16(&buf_pos);

  1001. 

  1002.     if(av_image_check_size(image_width, image_height, 0, avctx))

  1003.         return -1;

  1004.     if (image_width != avctx->width || image_height != avctx->height) {

  1005.         int ret;

  1006.         avcodec_set_dimensions(avctx, image_width, image_height);

  1007.         s->width  = avctx->width;

  1008.         s->height = avctx->height;

  1009.         ret = iv_alloc_frames(s);

  1010.         if (ret < 0) {

  1011.             s->width = s->height = 0;

  1012.             return ret;

  1013.         }

  1014.     }

  1015. 

  1016.     chroma_height = ((image_height >> 2) + 3) & 0x7ffc;

  1017.     chroma_width = ((image_width >> 2) + 3) & 0x7ffc;

  1018.     y_offset = bytestream_get_le32(&buf_pos);

  1019.     v_offset = bytestream_get_le32(&buf_pos);

  1020.     u_offset = bytestream_get_le32(&buf_pos);

  1021.     buf_pos += 4; /* reserved */

  1022.     hdr_pos = buf_pos;

  1023.     if(data_size == 0x80) return 4;

  1024. 

  1025.     if(FFMAX3(y_offset, v_offset, u_offset) >= buf_size-16) {

  1026.         av_log(s->avctx, AV_LOG_ERROR, "y/u/v offset outside buffer\n");

  1027.         return -1;

  1028.     }

  1029. 

  1030.     if(flags & 0x200) {

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

  1032.         s->ref_frame = s->iv_frame;

  1033.     } else {

  1034.         s->cur_frame = s->iv_frame;

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

  1036.     }

  1037. 

  1038.     buf_pos = buf + 16 + y_offset;

  1039.     mc_vector_count = bytestream_get_le32(&buf_pos);

  1040.     if(2LL*mc_vector_count >= buf_size-16-y_offset) {

  1041.         av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1042.         return -1;

  1043.     }

  1044. 

  1045.     iv_Decode_Chunk(s, s->cur_frame->Ybuf, s->ref_frame->Ybuf, image_width,

  1046.                     image_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1047.                     FFMIN(image_width, 160));

  1048. 

  1049.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1050.     {

  1051. 

  1052.         buf_pos = buf + 16 + v_offset;

  1053.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1054.         if(2LL*mc_vector_count >= buf_size-16-v_offset) {

  1055.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1056.             return -1;

  1057.         }

  1058. 

  1059.         iv_Decode_Chunk(s, s->cur_frame->Vbuf, s->ref_frame->Vbuf, chroma_width,

  1060.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1061.                 FFMIN(chroma_width, 40));

  1062. 

  1063.         buf_pos = buf + 16 + u_offset;

  1064.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1065.         if(2LL*mc_vector_count >= buf_size-16-u_offset) {

  1066.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1067.             return -1;

  1068.         }

  1069. 

  1070.         iv_Decode_Chunk(s, s->cur_frame->Ubuf, s->ref_frame->Ubuf, chroma_width,

  1071.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1072.                 FFMIN(chroma_width, 40));

  1073. 

  1074.     }

  1075. 

  1076.     return 8;

  1077. }

  1078. 

  1079. static int indeo3_decode_frame(AVCodecContext *avctx,

  1080.                                void *data, int *data_size,

  1081.                                AVPacket *avpkt)

  1082. {

  1083.     const uint8_t *buf = avpkt->data;

  1084.     int buf_size = avpkt->size;

  1085.     Indeo3DecodeContext *s=avctx->priv_data;

  1086.     uint8_t *src, *dest;

  1087.     int y;

  1088. 

  1089.     if (iv_decode_frame(avctx, buf, buf_size) < 0)

  1090.         return -1;

  1091. 

  1092.     if(s->frame.data[0])

  1093.         avctx->release_buffer(avctx, &s->frame);

  1094. 

  1095.     s->frame.reference = 0;

  1096.     if(avctx->get_buffer(avctx, &s->frame) < 0) {

  1097.         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1098.         return -1;

  1099.     }

  1100. 

  1101.     src = s->cur_frame->Ybuf;

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

  1103.     for (y = 0; y < s->height; y++) {

  1104.         memcpy(dest, src, s->cur_frame->y_w);

  1105.         src += s->cur_frame->y_w;

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

  1107.     }

  1108. 

  1109.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1110.     {

  1111.         src = s->cur_frame->Ubuf;

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

  1113.         for (y = 0; y < s->height / 4; y++) {

  1114.             memcpy(dest, src, s->cur_frame->uv_w);

  1115.             src += s->cur_frame->uv_w;

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

  1117.         }

  1118. 

  1119.         src = s->cur_frame->Vbuf;

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

  1121.         for (y = 0; y < s->height / 4; y++) {

  1122.             memcpy(dest, src, s->cur_frame->uv_w);

  1123.             src += s->cur_frame->uv_w;

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

  1125.         }

  1126.     }

  1127. 

  1128.     *data_size=sizeof(AVFrame);

  1129.     *(AVFrame*)data= s->frame;

  1130. 

  1131.     return buf_size;

  1132. }

  1133. 

  1134. static av_cold int indeo3_decode_end(AVCodecContext *avctx)

  1135. {

  1136.     Indeo3DecodeContext *s = avctx->priv_data;

  1137. 

  1138.     iv_free_func(s);

  1139. 

  1140.     return 0;

  1141. }

  1142. 

  1143. AVCodec ff_indeo3_decoder = {

  1144.     "indeo3",

  1145.     AVMEDIA_TYPE_VIDEO,

  1146.     CODEC_ID_INDEO3,

  1147.     sizeof(Indeo3DecodeContext),

  1148.     indeo3_decode_init,

  1149.     NULL,

  1150.     indeo3_decode_end,

  1151.     indeo3_decode_frame,

  1152.     CODEC_CAP_DR1,

  1153.     NULL,

  1154.     .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),

  1155. };