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FFmpeg/libavcodec/indeo3.c

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  1. /*

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

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include <stdio.h>

  23. #include <stdlib.h>

  24. #include <string.h>

  25. 

  26. #include "libavutil/imgutils.h"

  27. #include "avcodec.h"

  28. #include "dsputil.h"

  29. #include "bytestream.h"

  30. 

  31. #include "indeo3data.h"

  32. 

  33. typedef struct

  34. {

  35.     uint8_t *Ybuf;

  36.     uint8_t *Ubuf;

  37.     uint8_t *Vbuf;

  38.     unsigned short y_w, y_h;

  39.     unsigned short uv_w, uv_h;

  40. } YUVBufs;

  41. 

  42. typedef struct Indeo3DecodeContext {

  43.     AVCodecContext *avctx;

  44.     int width, height;

  45.     AVFrame frame;

  46. 

  47.     uint8_t *buf;

  48.     YUVBufs iv_frame[2];

  49.     YUVBufs *cur_frame;

  50.     YUVBufs *ref_frame;

  51. 

  52.     uint8_t *ModPred;

  53.     uint8_t *corrector_type;

  54. } Indeo3DecodeContext;

  55. 

  56. static const uint8_t corrector_type_0[24] = {

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

  58.     195, 159, 133, 115, 101,  93,  87,  77,

  59.     128,  79,  79,  79,  79,  79,  79,  79

  60. };

  61. 

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

  63. 

  64. static av_cold int build_modpred(Indeo3DecodeContext *s)

  65. {

  66.     int i, j;

  67. 

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

  69.         return AVERROR(ENOMEM);

  70. 

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

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

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

  74.                               i == 119 ||

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

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

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

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

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

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

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

  82.     }

  83. 

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

  85.         return AVERROR(ENOMEM);

  86. 

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

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

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

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

  91.                                          corrector_type_2[j - 248];

  92.         }

  93.     }

  94. 

  95.   return 0;

  96. }

  97. 

  98. static av_cold int iv_alloc_frames(Indeo3DecodeContext *s)

  99. {

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

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

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

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

  104.         luma_pixels   = luma_width   * luma_height,

  105.         chroma_pixels = chroma_width * chroma_height,

  106.         i;

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

  108.                           (chroma_pixels   + chroma_width) * 4;

  109. 

  110.     av_freep(&s->buf);

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

  112.         return AVERROR(ENOMEM);

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

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

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

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

  117. 

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

  119.     i = luma_pixels + luma_width * 2;

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

  121.     i += (luma_pixels + luma_width);

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

  123.     i += (chroma_pixels + chroma_width);

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

  125.     i += (chroma_pixels + chroma_width);

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

  127.     i += (chroma_pixels + chroma_width);

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

  129. 

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

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

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

  133. 

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

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

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

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

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

  139.     }

  140. 

  141.     return 0;

  142. }

  143. 

  144. static av_cold void iv_free_func(Indeo3DecodeContext *s)

  145. {

  146.     av_freep(&s->buf);

  147.     av_freep(&s->ModPred);

  148.     av_freep(&s->corrector_type);

  149. }

  150. 

  151. struct ustr {

  152.     int xpos;

  153.     int ypos;

  154.     int width;

  155.     int height;

  156.     int split_flag;

  157.     int split_direction;

  158.     int usl7;

  159. };

  160. 

  161. 

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

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

  164.         if(rle_v3 != 0)                 \

  165.             rle_v3 = 0;                 \

  166.         else {                          \

  167.             rle_v3 = 1;                 \

  168.             buf1 -= 2;                  \

  169.         }                               \

  170.     }                                   \

  171.     lp2 = 4;

  172. 

  173. 

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

  175.     if(rle_v3 == 0) {                            \

  176.         rle_v2 = *buf1;                          \

  177.         rle_v1 = 1;                              \

  178.         if(rle_v2 > 32) {                        \

  179.             rle_v2 -= 32;                        \

  180.             rle_v1 = 0;                          \

  181.         }                                        \

  182.         rle_v3 = 1;                              \

  183.     }                                            \

  184.     buf1--;

  185. 

  186. 

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

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

  189.         rle_v3 = 0;                 \

  190.     else {                          \

  191.         buf1--;                     \

  192.         rle_v3 = 1;                 \

  193.     }

  194. 

  195. 

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

  197.     rle_v2--;                                 \

  198.     if(rle_v2 == 0) {                         \

  199.         rle_v3 = 0;                           \

  200.         buf1 += 2;                            \

  201.     }                                         \

  202.     lp2 = 4;

  203. 

  204. static void iv_Decode_Chunk(Indeo3DecodeContext *s,

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

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

  207.         const uint8_t *buf2, int min_width_160)

  208. {

  209.     uint8_t bit_buf;

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

  211.     int *width_tbl, width_tbl_arr[10];

  212.     const signed char *ref_vectors;

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

  214.     uint32_t *cur_lp, *ref_lp;

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

  216.     uint8_t *correction_type_sp[2];

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

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

  219.         rle_v1, rle_v2, rle_v3;

  220.     unsigned short res;

  221. 

  222.     bit_buf = 0;

  223.     ref_vectors = NULL;

  224. 

  225.     width_tbl = width_tbl_arr + 1;

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

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

  228.         width_tbl[j] = i * j;

  229. 

  230.     strip = strip_tbl;

  231. 

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

  233. 

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

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

  236.     strip->height = height;

  237.     strip->split_direction = 0;

  238.     strip->split_flag = 0;

  239.     strip->usl7 = 0;

  240. 

  241.     bit_pos = 0;

  242. 

  243.     rle_v1 = rle_v2 = rle_v3 = 0;

  244. 

  245.     while(strip >= strip_tbl) {

  246.         if(bit_pos <= 0) {

  247.             bit_pos = 8;

  248.             bit_buf = *buf1++;

  249.         }

  250. 

  251.         bit_pos -= 2;

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

  253. 

  254.         if(cmd == 0) {

  255.             strip++;

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

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

  258.                 break;

  259.             }

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

  261.             strip->split_flag = 1;

  262.             strip->split_direction = 0;

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

  264.             continue;

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

  266.             strip++;

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

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

  269.                 break;

  270.             }

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

  272.             strip->split_flag = 1;

  273.             strip->split_direction = 1;

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

  275.             continue;

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

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

  278.                 strip->usl7 = 1;

  279.                 ref_vectors = NULL;

  280.                 continue;

  281.             }

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

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

  284.                 strip->usl7 = 1;

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

  286.                 buf1++;

  287.                 continue;

  288.             }

  289.         }

  290. 

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

  292. 

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

  294.             blks_width += 3;

  295.         blks_width >>= 2;

  296.         blks_height = strip->height;

  297. 

  298.         if(ref_vectors != NULL) {

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

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

  301.         } else

  302.             ref_frm_pos = cur_frm_pos - width_tbl[4];

  303. 

  304.         if(cmd == 2) {

  305.             if(bit_pos <= 0) {

  306.                 bit_pos = 8;

  307.                 bit_buf = *buf1++;

  308.             }

  309. 

  310.             bit_pos -= 2;

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

  312. 

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

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

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

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

  317.                     cur_frm_pos += 4;

  318.                     ref_frm_pos += 4;

  319.                 }

  320.             } else if(cmd != 1)

  321.                 return;

  322.         } else {

  323.             k = *buf1 >> 4;

  324.             j = *buf1 & 0x0f;

  325.             buf1++;

  326.             lv = j + cb_offset;

  327. 

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

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

  330.                 cp = ref_frm_pos;

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

  332.                     int v = *cp >> 1;

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

  334.                 }

  335.             }

  336. 

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

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

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

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

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

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

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

  344.             } else {

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

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

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

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

  349.             }

  350. 

  351.             switch(k) {

  352.             case 1:

  353.             case 0:                    /********** CASE 0 **********/

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

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

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

  357.                             k = *buf1++;

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

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

  360. 

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

  362.                             case 0:

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

  364.                                 lp2++;

  365.                                 break;

  366.                             case 1:

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

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

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

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

  371.                                 buf1++;

  372.                                 lp2++;

  373.                                 break;

  374.                             case 2:

  375.                                 if(lp2 == 0) {

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

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

  378.                                     lp2 += 2;

  379.                                 }

  380.                                 break;

  381.                             case 3:

  382.                                 if(lp2 < 2) {

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

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

  385.                                     lp2 = 3;

  386.                                 }

  387.                                 break;

  388.                             case 8:

  389.                                 if(lp2 == 0) {

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

  391. 

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

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

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

  395.                                     }

  396. 

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

  398.                                     break;

  399.                                 } else {

  400.                                     rle_v1 = 1;

  401.                                     rle_v2 = *buf1 - 1;

  402.                                 }

  403.                             case 5:

  404.                                 LP2_CHECK(buf1,rle_v3,lp2)

  405.                             case 4:

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

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

  408.                                 lp2 = 4;

  409.                                 break;

  410. 

  411.                             case 7:

  412.                                 if(rle_v3 != 0)

  413.                                     rle_v3 = 0;

  414.                                 else {

  415.                                     buf1--;

  416.                                     rle_v3 = 1;

  417.                                 }

  418.                             case 6:

  419.                                 if(ref_vectors != NULL) {

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

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

  422.                                 }

  423.                                 lp2 = 4;

  424.                                 break;

  425. 

  426.                             case 9:

  427.                                 lv1 = *buf1++;

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

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

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

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

  432.                                     cur_lp[j] = lv;

  433. 

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

  435.                                 break;

  436.                             default:

  437.                                 return;

  438.                             }

  439.                         }

  440. 

  441.                         cur_frm_pos += 4;

  442.                         ref_frm_pos += 4;

  443.                     }

  444. 

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

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

  447.                 }

  448.                 break;

  449. 

  450.             case 4:

  451.             case 3:                    /********** CASE 3 **********/

  452.                 if(ref_vectors != NULL)

  453.                     return;

  454.                 flag1 = 1;

  455. 

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

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

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

  459.                             k = *buf1++;

  460. 

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

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

  463. 

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

  465.                             case 0:

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

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

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

  469.                                 else

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

  471.                                 lp2++;

  472.                                 break;

  473. 

  474.                             case 1:

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

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

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

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

  479. 

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

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

  482.                                 else

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

  484.                                 buf1++;

  485.                                 lp2++;

  486.                                 break;

  487. 

  488.                             case 2:

  489.                                 if(lp2 == 0) {

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

  491.                                         cur_lp[j] = *ref_lp;

  492.                                     lp2 += 2;

  493.                                 }

  494.                                 break;

  495. 

  496.                             case 3:

  497.                                 if(lp2 < 2) {

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

  499.                                         cur_lp[j] = *ref_lp;

  500.                                     lp2 = 3;

  501.                                 }

  502.                                 break;

  503. 

  504.                             case 6:

  505.                                 lp2 = 4;

  506.                                 break;

  507. 

  508.                             case 7:

  509.                                 if(rle_v3 != 0)

  510.                                     rle_v3 = 0;

  511.                                 else {

  512.                                     buf1--;

  513.                                     rle_v3 = 1;

  514.                                 }

  515.                                 lp2 = 4;

  516.                                 break;

  517. 

  518.                             case 8:

  519.                                 if(lp2 == 0) {

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

  521. 

  522.                                     if(rle_v1 == 1) {

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

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

  525.                                     }

  526. 

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

  528.                                     break;

  529.                                 } else {

  530.                                     rle_v2 = (*buf1) - 1;

  531.                                     rle_v1 = 1;

  532.                                 }

  533.                             case 5:

  534.                                 LP2_CHECK(buf1,rle_v3,lp2)

  535.                             case 4:

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

  537.                                     cur_lp[j] = *ref_lp;

  538.                                 lp2 = 4;

  539.                                 break;

  540. 

  541.                             case 9:

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

  543.                                 lv1 = *buf1++;

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

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

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

  547. 

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

  549.                                     cur_lp[j] = lv;

  550. 

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

  552.                                 break;

  553. 

  554.                             default:

  555.                                 return;

  556.                             }

  557.                         }

  558. 

  559.                         cur_frm_pos += 4;

  560.                     }

  561. 

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

  563.                     flag1 = 0;

  564.                 }

  565.                 break;

  566. 

  567.             case 10:                    /********** CASE 10 **********/

  568.                 if(ref_vectors == NULL) {

  569.                     flag1 = 1;

  570. 

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

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

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

  574.                                 k = *buf1++;

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

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

  577.                                 lv1 = ref_lp[0];

  578.                                 lv2 = ref_lp[1];

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

  580. #if HAVE_BIGENDIAN

  581.                                     lv1 = lv1 & 0xFF00FF00;

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

  583.                                     lv2 = lv2 & 0xFF00FF00;

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

  585. #else

  586.                                     lv1 = lv1 & 0x00FF00FF;

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

  588.                                     lv2 = lv2 & 0x00FF00FF;

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

  590. #endif

  591.                                 }

  592. 

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

  594.                                 case 0:

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

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

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

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

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

  600.                                     } else {

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

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

  603.                                     }

  604.                                     lp2++;

  605.                                     break;

  606. 

  607.                                 case 1:

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

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

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

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

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

  613.                                     } else {

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

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

  616.                                     }

  617.                                     buf1++;

  618.                                     lp2++;

  619.                                     break;

  620. 

  621.                                 case 2:

  622.                                     if(lp2 == 0) {

  623.                                         if(flag1 != 0) {

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

  625.                                                 cur_lp[j] = lv1;

  626.                                                 cur_lp[j+1] = lv2;

  627.                                             }

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

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

  630.                                         } else {

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

  632.                                                 cur_lp[j] = lv1;

  633.                                                 cur_lp[j+1] = lv2;

  634.                                             }

  635.                                         }

  636.                                         lp2 += 2;

  637.                                     }

  638.                                     break;

  639. 

  640.                                 case 3:

  641.                                     if(lp2 < 2) {

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

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

  644.                                                 cur_lp[j] = lv1;

  645.                                                 cur_lp[j+1] = lv2;

  646.                                             }

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

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

  649.                                         } else {

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

  651.                                                 cur_lp[j] = lv1;

  652.                                                 cur_lp[j+1] = lv2;

  653.                                             }

  654.                                         }

  655.                                         lp2 = 3;

  656.                                     }

  657.                                     break;

  658. 

  659.                                 case 8:

  660.                                     if(lp2 == 0) {

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

  662.                                         if(rle_v1 == 1) {

  663.                                             if(flag1 != 0) {

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

  665.                                                     cur_lp[j] = lv1;

  666.                                                     cur_lp[j+1] = lv2;

  667.                                                 }

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

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

  670.                                             } else {

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

  672.                                                     cur_lp[j] = lv1;

  673.                                                     cur_lp[j+1] = lv2;

  674.                                                 }

  675.                                             }

  676.                                         }

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

  678.                                         break;

  679.                                     } else {

  680.                                         rle_v1 = 1;

  681.                                         rle_v2 = (*buf1) - 1;

  682.                                     }

  683.                                 case 5:

  684.                                     LP2_CHECK(buf1,rle_v3,lp2)

  685.                                 case 4:

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

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

  688.                                             cur_lp[j] = lv1;

  689.                                             cur_lp[j+1] = lv2;

  690.                                         }

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

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

  693.                                     } else {

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

  695.                                             cur_lp[j] = lv1;

  696.                                             cur_lp[j+1] = lv2;

  697.                                         }

  698.                                     }

  699.                                     lp2 = 4;

  700.                                     break;

  701. 

  702.                                 case 6:

  703.                                     lp2 = 4;

  704.                                     break;

  705. 

  706.                                 case 7:

  707.                                     if(lp2 == 0) {

  708.                                         if(rle_v3 != 0)

  709.                                             rle_v3 = 0;

  710.                                         else {

  711.                                             buf1--;

  712.                                             rle_v3 = 1;

  713.                                         }

  714.                                         lp2 = 4;

  715.                                     }

  716.                                     break;

  717. 

  718.                                 case 9:

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

  720.                                     lv1 = *buf1;

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

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

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

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

  725.                                         cur_lp[j] = lv;

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

  727.                                     break;

  728. 

  729.                                 default:

  730.                                     return;

  731.                                 }

  732.                             }

  733. 

  734.                             cur_frm_pos += 8;

  735.                         }

  736. 

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

  738.                         flag1 = 0;

  739.                     }

  740.                 } else {

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

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

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

  744.                                 k = *buf1++;

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

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

  747. 

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

  749.                                 case 0:

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

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

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

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

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

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

  756.                                     lp2++;

  757.                                     break;

  758. 

  759.                                 case 1:

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

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

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

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

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

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

  766.                                     lp2++;

  767.                                     break;

  768. 

  769.                                 case 2:

  770.                                     if(lp2 == 0) {

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

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

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

  774.                                         }

  775.                                         lp2 += 2;

  776.                                     }

  777.                                     break;

  778. 

  779.                                 case 3:

  780.                                     if(lp2 < 2) {

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

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

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

  784.                                         }

  785.                                         lp2 = 3;

  786.                                     }

  787.                                     break;

  788. 

  789.                                 case 8:

  790.                                     if(lp2 == 0) {

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

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

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

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

  795.                                         }

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

  797.                                         break;

  798.                                     } else {

  799.                                         rle_v1 = 1;

  800.                                         rle_v2 = (*buf1) - 1;

  801.                                     }

  802.                                 case 5:

  803.                                 case 7:

  804.                                     LP2_CHECK(buf1,rle_v3,lp2)

  805.                                 case 6:

  806.                                 case 4:

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

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

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

  810.                                     }

  811.                                     lp2 = 4;

  812.                                     break;

  813. 

  814.                                 case 9:

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

  816.                                     lv1 = *buf1;

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

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

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

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

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

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

  823.                                     break;

  824. 

  825.                                 default:

  826.                                     return;

  827.                                 }

  828.                             }

  829. 

  830.                             cur_frm_pos += 8;

  831.                             ref_frm_pos += 8;

  832.                         }

  833. 

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

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

  836.                     }

  837.                 }

  838.                 break;

  839. 

  840.             case 11:                    /********** CASE 11 **********/

  841.                 if(ref_vectors == NULL)

  842.                     return;

  843. 

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

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

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

  847.                             k = *buf1++;

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

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

  850. 

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

  852.                             case 0:

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

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

  855.                                 lp2++;

  856.                                 break;

  857. 

  858.                             case 1:

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

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

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

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

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

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

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

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

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

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

  869.                                 lp2++;

  870.                                 break;

  871. 

  872.                             case 2:

  873.                                 if(lp2 == 0) {

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

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

  876.                                     lp2 += 2;

  877.                                 }

  878.                                 break;

  879. 

  880.                             case 3:

  881.                                 if(lp2 < 2) {

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

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

  884.                                     lp2 = 3;

  885.                                 }

  886.                                 break;

  887. 

  888.                             case 8:

  889.                                 if(lp2 == 0) {

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

  891. 

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

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

  894. 

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

  896.                                     break;

  897.                                 } else {

  898.                                     rle_v1 = 1;

  899.                                     rle_v2 = (*buf1) - 1;

  900.                                 }

  901.                             case 5:

  902.                             case 7:

  903.                                 LP2_CHECK(buf1,rle_v3,lp2)

  904.                             case 4:

  905.                             case 6:

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

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

  908.                                 lp2 = 4;

  909.                                 break;

  910. 

  911.                             case 9:

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

  913.                                 lv1 = *buf1++;

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

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

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

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

  918.                                     cur_lp[j] = lv;

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

  920.                                 break;

  921. 

  922.                             default:

  923.                                 return;

  924.                             }

  925.                         }

  926. 

  927.                         cur_frm_pos += 4;

  928.                         ref_frm_pos += 4;

  929.                     }

  930. 

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

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

  933.                 }

  934.                 break;

  935. 

  936.             default:

  937.                 return;

  938.             }

  939.         }

  940. 

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

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

  943.                 strip->split_flag = 0;

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

  945. 

  946.                 if(strip->split_direction) {

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

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

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

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

  951.                 } else {

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

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

  954.                 }

  955.                 break;

  956.             }

  957.         }

  958.     }

  959. }

  960. 

  961. static av_cold int indeo3_decode_init(AVCodecContext *avctx)

  962. {

  963.     Indeo3DecodeContext *s = avctx->priv_data;

  964.     int ret = 0;

  965. 

  966.     s->avctx = avctx;

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

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

  969.     avctx->pix_fmt = PIX_FMT_YUV410P;

  970. 

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

  972.         ret = iv_alloc_frames(s);

  973.     if (ret)

  974.         iv_free_func(s);

  975. 

  976.     return ret;

  977. }

  978. 

  979. static int iv_decode_frame(AVCodecContext *avctx,

  980.                            const uint8_t *buf, int buf_size)

  981. {

  982.     Indeo3DecodeContext *s = avctx->priv_data;

  983.     unsigned int image_width, image_height,

  984.                  chroma_width, chroma_height;

  985.     unsigned int flags, cb_offset, data_size,

  986.                   y_offset, v_offset, u_offset, mc_vector_count;

  987.     const uint8_t *hdr_pos, *buf_pos;

  988. 

  989.     buf_pos = buf;

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

  991. 

  992.     flags = bytestream_get_le16(&buf_pos);

  993.     data_size = bytestream_get_le32(&buf_pos);

  994.     cb_offset = *buf_pos++;

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

  996.     image_height = bytestream_get_le16(&buf_pos);

  997.     image_width  = bytestream_get_le16(&buf_pos);

  998. 

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

  1000.         return -1;

  1001.     if (image_width != avctx->width || image_height != avctx->height) {

  1002.         int ret;

  1003.         avcodec_set_dimensions(avctx, image_width, image_height);

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

  1005.         s->height = avctx->height;

  1006.         ret = iv_alloc_frames(s);

  1007.         if (ret < 0) {

  1008.             s->width = s->height = 0;

  1009.             return ret;

  1010.         }

  1011.     }

  1012. 

  1013.     chroma_height = ((image_height >> 2) + 3) & 0x7ffc;

  1014.     chroma_width = ((image_width >> 2) + 3) & 0x7ffc;

  1015.     y_offset = bytestream_get_le32(&buf_pos);

  1016.     v_offset = bytestream_get_le32(&buf_pos);

  1017.     u_offset = bytestream_get_le32(&buf_pos);

  1018.     buf_pos += 4; /* reserved */

  1019.     hdr_pos = buf_pos;

  1020.     if(data_size == 0x80) return 4;

  1021. 

  1022.     if(FFMAX3(y_offset, v_offset, u_offset) >= buf_size-16) {

  1023.         av_log(s->avctx, AV_LOG_ERROR, "y/u/v offset outside buffer\n");

  1024.         return -1;

  1025.     }

  1026. 

  1027.     if(flags & 0x200) {

  1028.         s->cur_frame = s->iv_frame + 1;

  1029.         s->ref_frame = s->iv_frame;

  1030.     } else {

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

  1032.         s->ref_frame = s->iv_frame + 1;

  1033.     }

  1034. 

  1035.     buf_pos = buf + 16 + y_offset;

  1036.     mc_vector_count = bytestream_get_le32(&buf_pos);

  1037.     if(2LL*mc_vector_count >= buf_size-16-y_offset) {

  1038.         av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1039.         return -1;

  1040.     }

  1041. 

  1042.     iv_Decode_Chunk(s, s->cur_frame->Ybuf, s->ref_frame->Ybuf, image_width,

  1043.                     image_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1044.                     FFMIN(image_width, 160));

  1045. 

  1046.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1047.     {

  1048. 

  1049.         buf_pos = buf + 16 + v_offset;

  1050.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1051.         if(2LL*mc_vector_count >= buf_size-16-v_offset) {

  1052.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1053.             return -1;

  1054.         }

  1055. 

  1056.         iv_Decode_Chunk(s, s->cur_frame->Vbuf, s->ref_frame->Vbuf, chroma_width,

  1057.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1058.                 FFMIN(chroma_width, 40));

  1059. 

  1060.         buf_pos = buf + 16 + u_offset;

  1061.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1062.         if(2LL*mc_vector_count >= buf_size-16-u_offset) {

  1063.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1064.             return -1;

  1065.         }

  1066. 

  1067.         iv_Decode_Chunk(s, s->cur_frame->Ubuf, s->ref_frame->Ubuf, chroma_width,

  1068.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1069.                 FFMIN(chroma_width, 40));

  1070. 

  1071.     }

  1072. 

  1073.     return 8;

  1074. }

  1075. 

  1076. static int indeo3_decode_frame(AVCodecContext *avctx,

  1077.                                void *data, int *data_size,

  1078.                                AVPacket *avpkt)

  1079. {

  1080.     const uint8_t *buf = avpkt->data;

  1081.     int buf_size = avpkt->size;

  1082.     Indeo3DecodeContext *s=avctx->priv_data;

  1083.     uint8_t *src, *dest;

  1084.     int y;

  1085. 

  1086.     if (iv_decode_frame(avctx, buf, buf_size) < 0)

  1087.         return -1;

  1088. 

  1089.     if(s->frame.data[0])

  1090.         avctx->release_buffer(avctx, &s->frame);

  1091. 

  1092.     s->frame.reference = 0;

  1093.     if(avctx->get_buffer(avctx, &s->frame) < 0) {

  1094.         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1095.         return -1;

  1096.     }

  1097. 

  1098.     src = s->cur_frame->Ybuf;

  1099.     dest = s->frame.data[0];

  1100.     for (y = 0; y < s->height; y++) {

  1101.         memcpy(dest, src, s->cur_frame->y_w);

  1102.         src += s->cur_frame->y_w;

  1103.         dest += s->frame.linesize[0];

  1104.     }

  1105. 

  1106.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1107.     {

  1108.         src = s->cur_frame->Ubuf;

  1109.         dest = s->frame.data[1];

  1110.         for (y = 0; y < s->height / 4; y++) {

  1111.             memcpy(dest, src, s->cur_frame->uv_w);

  1112.             src += s->cur_frame->uv_w;

  1113.             dest += s->frame.linesize[1];

  1114.         }

  1115. 

  1116.         src = s->cur_frame->Vbuf;

  1117.         dest = s->frame.data[2];

  1118.         for (y = 0; y < s->height / 4; y++) {

  1119.             memcpy(dest, src, s->cur_frame->uv_w);

  1120.             src += s->cur_frame->uv_w;

  1121.             dest += s->frame.linesize[2];

  1122.         }

  1123.     }

  1124. 

  1125.     *data_size=sizeof(AVFrame);

  1126.     *(AVFrame*)data= s->frame;

  1127. 

  1128.     return buf_size;

  1129. }

  1130. 

  1131. static av_cold int indeo3_decode_end(AVCodecContext *avctx)

  1132. {

  1133.     Indeo3DecodeContext *s = avctx->priv_data;

  1134. 

  1135.     iv_free_func(s);

  1136. 

  1137.     return 0;

  1138. }

  1139. 

  1140. AVCodec ff_indeo3_decoder = {

  1141.     .name           = "indeo3",

  1142.     .type           = AVMEDIA_TYPE_VIDEO,

  1143.     .id             = CODEC_ID_INDEO3,

  1144.     .priv_data_size = sizeof(Indeo3DecodeContext),

  1145.     .init           = indeo3_decode_init,

  1146.     .close          = indeo3_decode_end,

  1147.     .decode         = indeo3_decode_frame,

  1148.     .capabilities   = CODEC_CAP_DR1,

  1149.     .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 3"),

  1150. };