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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.     uint8_t *cur_end = cur + width*height + width;

  217.     uint32_t *cur_lp, *ref_lp;

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

  219.     uint8_t *correction_type_sp[2];

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

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

  222.         rle_v1, rle_v2, rle_v3;

  223.     unsigned short res;

  224. 

  225.     bit_buf = 0;

  226.     ref_vectors = NULL;

  227. 

  228.     width_tbl = width_tbl_arr + 1;

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

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

  231.         width_tbl[j] = i * j;

  232. 

  233.     strip = strip_tbl;

  234. 

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

  236. 

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

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

  239.     strip->height = height;

  240.     strip->split_direction = 0;

  241.     strip->split_flag = 0;

  242.     strip->usl7 = 0;

  243. 

  244.     bit_pos = 0;

  245. 

  246.     rle_v1 = rle_v2 = rle_v3 = 0;

  247. 

  248.     while(strip >= strip_tbl) {

  249.         if(bit_pos <= 0) {

  250.             bit_pos = 8;

  251.             bit_buf = *buf1++;

  252.         }

  253. 

  254.         bit_pos -= 2;

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

  256. 

  257.         if(cmd == 0) {

  258.             strip++;

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

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

  261.                 break;

  262.             }

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

  264.             strip->split_flag = 1;

  265.             strip->split_direction = 0;

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

  267.             continue;

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

  269.             strip++;

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

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

  272.                 break;

  273.             }

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

  275.             strip->split_flag = 1;

  276.             strip->split_direction = 1;

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

  278.             continue;

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

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

  281.                 strip->usl7 = 1;

  282.                 ref_vectors = NULL;

  283.                 continue;

  284.             }

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

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

  287.                 strip->usl7 = 1;

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

  289.                 buf1++;

  290.                 continue;

  291.             }

  292.         }

  293. 

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

  295. 

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

  297.             blks_width += 3;

  298.         blks_width >>= 2;

  299.         blks_height = strip->height;

  300. 

  301.         if(ref_vectors != NULL) {

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

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

  304.         } else

  305.             ref_frm_pos = cur_frm_pos - width_tbl[4];

  306. 

  307.         if(cmd == 2) {

  308.             if(bit_pos <= 0) {

  309.                 bit_pos = 8;

  310.                 bit_buf = *buf1++;

  311.             }

  312. 

  313.             bit_pos -= 2;

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

  315. 

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

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

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

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

  320.                     cur_frm_pos += 4;

  321.                     ref_frm_pos += 4;

  322.                 }

  323.             } else if(cmd != 1)

  324.                 return;

  325.         } else {

  326.             k = *buf1 >> 4;

  327.             j = *buf1 & 0x0f;

  328.             buf1++;

  329.             lv = j + cb_offset;

  330. 

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

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

  333.                 cp = ref_frm_pos;

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

  335.                     int v = *cp >> 1;

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

  337.                 }

  338.             }

  339. 

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

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

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

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

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

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

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

  347.             } else {

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

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

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

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

  352.             }

  353. 

  354.             switch(k) {

  355.             case 1:

  356.             case 0:                    /********** CASE 0 **********/

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

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

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

  360.                             k = *buf1++;

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

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

  363.                             if ((uint8_t *)cur_lp >= cur_end-3)

  364.                                 break;

  365. 

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

  367.                             case 0:

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

  369.                                 lp2++;

  370.                                 break;

  371.                             case 1:

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

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

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

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

  376.                                 buf1++;

  377.                                 lp2++;

  378.                                 break;

  379.                             case 2:

  380.                                 if(lp2 == 0) {

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

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

  383.                                     lp2 += 2;

  384.                                 }

  385.                                 break;

  386.                             case 3:

  387.                                 if(lp2 < 2) {

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

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

  390.                                     lp2 = 3;

  391.                                 }

  392.                                 break;

  393.                             case 8:

  394.                                 if(lp2 == 0) {

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

  396. 

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

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

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

  400.                                     }

  401. 

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

  403.                                     break;

  404.                                 } else {

  405.                                     rle_v1 = 1;

  406.                                     rle_v2 = *buf1 - 1;

  407.                                 }

  408.                             case 5:

  409.                                 LP2_CHECK(buf1,rle_v3,lp2)

  410.                             case 4:

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

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

  413.                                 lp2 = 4;

  414.                                 break;

  415. 

  416.                             case 7:

  417.                                 if(rle_v3 != 0)

  418.                                     rle_v3 = 0;

  419.                                 else {

  420.                                     buf1--;

  421.                                     rle_v3 = 1;

  422.                                 }

  423.                             case 6:

  424.                                 if(ref_vectors != NULL) {

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

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

  427.                                 }

  428.                                 lp2 = 4;

  429.                                 break;

  430. 

  431.                             case 9:

  432.                                 lv1 = *buf1++;

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

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

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

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

  437.                                     cur_lp[j] = lv;

  438. 

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

  440.                                 break;

  441.                             default:

  442.                                 return;

  443.                             }

  444.                         }

  445. 

  446.                         cur_frm_pos += 4;

  447.                         ref_frm_pos += 4;

  448.                     }

  449. 

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

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

  452.                 }

  453.                 break;

  454. 

  455.             case 4:

  456.             case 3:                    /********** CASE 3 **********/

  457.                 if(ref_vectors != NULL)

  458.                     return;

  459.                 flag1 = 1;

  460. 

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

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

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

  464.                             k = *buf1++;

  465. 

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

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

  468. 

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

  470.                             case 0:

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

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

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

  474.                                 else

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

  476.                                 lp2++;

  477.                                 break;

  478. 

  479.                             case 1:

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

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

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

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

  484. 

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

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

  487.                                 else

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

  489.                                 buf1++;

  490.                                 lp2++;

  491.                                 break;

  492. 

  493.                             case 2:

  494.                                 if(lp2 == 0) {

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

  496.                                         cur_lp[j] = *ref_lp;

  497.                                     lp2 += 2;

  498.                                 }

  499.                                 break;

  500. 

  501.                             case 3:

  502.                                 if(lp2 < 2) {

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

  504.                                         cur_lp[j] = *ref_lp;

  505.                                     lp2 = 3;

  506.                                 }

  507.                                 break;

  508. 

  509.                             case 6:

  510.                                 lp2 = 4;

  511.                                 break;

  512. 

  513.                             case 7:

  514.                                 if(rle_v3 != 0)

  515.                                     rle_v3 = 0;

  516.                                 else {

  517.                                     buf1--;

  518.                                     rle_v3 = 1;

  519.                                 }

  520.                                 lp2 = 4;

  521.                                 break;

  522. 

  523.                             case 8:

  524.                                 if(lp2 == 0) {

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

  526. 

  527.                                     if(rle_v1 == 1) {

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

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

  530.                                     }

  531. 

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

  533.                                     break;

  534.                                 } else {

  535.                                     rle_v2 = (*buf1) - 1;

  536.                                     rle_v1 = 1;

  537.                                 }

  538.                             case 5:

  539.                                 LP2_CHECK(buf1,rle_v3,lp2)

  540.                             case 4:

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

  542.                                     cur_lp[j] = *ref_lp;

  543.                                 lp2 = 4;

  544.                                 break;

  545. 

  546.                             case 9:

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

  548.                                 lv1 = *buf1++;

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

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

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

  552. 

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

  554.                                     cur_lp[j] = lv;

  555. 

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

  557.                                 break;

  558. 

  559.                             default:

  560.                                 return;

  561.                             }

  562.                         }

  563. 

  564.                         cur_frm_pos += 4;

  565.                     }

  566. 

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

  568.                     flag1 = 0;

  569.                 }

  570.                 break;

  571. 

  572.             case 10:                    /********** CASE 10 **********/

  573.                 if(ref_vectors == NULL) {

  574.                     flag1 = 1;

  575. 

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

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

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

  579.                                 k = *buf1++;

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

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

  582.                                 lv1 = ref_lp[0];

  583.                                 lv2 = ref_lp[1];

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

  585. #if HAVE_BIGENDIAN

  586.                                     lv1 = lv1 & 0xFF00FF00;

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

  588.                                     lv2 = lv2 & 0xFF00FF00;

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

  590. #else

  591.                                     lv1 = lv1 & 0x00FF00FF;

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

  593.                                     lv2 = lv2 & 0x00FF00FF;

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

  595. #endif

  596.                                 }

  597. 

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

  599.                                 case 0:

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

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

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

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

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

  605.                                     } else {

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

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

  608.                                     }

  609.                                     lp2++;

  610.                                     break;

  611. 

  612.                                 case 1:

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

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

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

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

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

  618.                                     } else {

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

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

  621.                                     }

  622.                                     buf1++;

  623.                                     lp2++;

  624.                                     break;

  625. 

  626.                                 case 2:

  627.                                     if(lp2 == 0) {

  628.                                         if(flag1 != 0) {

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

  630.                                                 cur_lp[j] = lv1;

  631.                                                 cur_lp[j+1] = lv2;

  632.                                             }

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

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

  635.                                         } else {

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

  637.                                                 cur_lp[j] = lv1;

  638.                                                 cur_lp[j+1] = lv2;

  639.                                             }

  640.                                         }

  641.                                         lp2 += 2;

  642.                                     }

  643.                                     break;

  644. 

  645.                                 case 3:

  646.                                     if(lp2 < 2) {

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

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

  649.                                                 cur_lp[j] = lv1;

  650.                                                 cur_lp[j+1] = lv2;

  651.                                             }

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

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

  654.                                         } else {

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

  656.                                                 cur_lp[j] = lv1;

  657.                                                 cur_lp[j+1] = lv2;

  658.                                             }

  659.                                         }

  660.                                         lp2 = 3;

  661.                                     }

  662.                                     break;

  663. 

  664.                                 case 8:

  665.                                     if(lp2 == 0) {

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

  667.                                         if(rle_v1 == 1) {

  668.                                             if(flag1 != 0) {

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

  670.                                                     cur_lp[j] = lv1;

  671.                                                     cur_lp[j+1] = lv2;

  672.                                                 }

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

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

  675.                                             } else {

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

  677.                                                     cur_lp[j] = lv1;

  678.                                                     cur_lp[j+1] = lv2;

  679.                                                 }

  680.                                             }

  681.                                         }

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

  683.                                         break;

  684.                                     } else {

  685.                                         rle_v1 = 1;

  686.                                         rle_v2 = (*buf1) - 1;

  687.                                     }

  688.                                 case 5:

  689.                                     LP2_CHECK(buf1,rle_v3,lp2)

  690.                                 case 4:

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

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

  693.                                             cur_lp[j] = lv1;

  694.                                             cur_lp[j+1] = lv2;

  695.                                         }

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

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

  698.                                     } else {

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

  700.                                             cur_lp[j] = lv1;

  701.                                             cur_lp[j+1] = lv2;

  702.                                         }

  703.                                     }

  704.                                     lp2 = 4;

  705.                                     break;

  706. 

  707.                                 case 6:

  708.                                     lp2 = 4;

  709.                                     break;

  710. 

  711.                                 case 7:

  712.                                     if(lp2 == 0) {

  713.                                         if(rle_v3 != 0)

  714.                                             rle_v3 = 0;

  715.                                         else {

  716.                                             buf1--;

  717.                                             rle_v3 = 1;

  718.                                         }

  719.                                         lp2 = 4;

  720.                                     }

  721.                                     break;

  722. 

  723.                                 case 9:

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

  725.                                     lv1 = *buf1;

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

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

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

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

  730.                                         cur_lp[j] = lv;

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

  732.                                     break;

  733. 

  734.                                 default:

  735.                                     return;

  736.                                 }

  737.                             }

  738. 

  739.                             cur_frm_pos += 8;

  740.                         }

  741. 

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

  743.                         flag1 = 0;

  744.                     }

  745.                 } else {

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

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

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

  749.                                 k = *buf1++;

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

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

  752. 

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

  754.                                 case 0:

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

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

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

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

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

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

  761.                                     lp2++;

  762.                                     break;

  763. 

  764.                                 case 1:

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

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

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

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

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

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

  771.                                     lp2++;

  772.                                     break;

  773. 

  774.                                 case 2:

  775.                                     if(lp2 == 0) {

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

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

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

  779.                                         }

  780.                                         lp2 += 2;

  781.                                     }

  782.                                     break;

  783. 

  784.                                 case 3:

  785.                                     if(lp2 < 2) {

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

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

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

  789.                                         }

  790.                                         lp2 = 3;

  791.                                     }

  792.                                     break;

  793. 

  794.                                 case 8:

  795.                                     if(lp2 == 0) {

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

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

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

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

  800.                                         }

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

  802.                                         break;

  803.                                     } else {

  804.                                         rle_v1 = 1;

  805.                                         rle_v2 = (*buf1) - 1;

  806.                                     }

  807.                                 case 5:

  808.                                 case 7:

  809.                                     LP2_CHECK(buf1,rle_v3,lp2)

  810.                                 case 6:

  811.                                 case 4:

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

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

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

  815.                                     }

  816.                                     lp2 = 4;

  817.                                     break;

  818. 

  819.                                 case 9:

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

  821.                                     lv1 = *buf1;

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

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

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

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

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

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

  828.                                     break;

  829. 

  830.                                 default:

  831.                                     return;

  832.                                 }

  833.                             }

  834. 

  835.                             cur_frm_pos += 8;

  836.                             ref_frm_pos += 8;

  837.                         }

  838. 

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

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

  841.                     }

  842.                 }

  843.                 break;

  844. 

  845.             case 11:                    /********** CASE 11 **********/

  846.                 if(ref_vectors == NULL)

  847.                     return;

  848. 

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

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

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

  852.                             k = *buf1++;

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

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

  855. 

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

  857.                             case 0:

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

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

  860.                                 lp2++;

  861.                                 break;

  862. 

  863.                             case 1:

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

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

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

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

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

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

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

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

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

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

  874.                                 lp2++;

  875.                                 break;

  876. 

  877.                             case 2:

  878.                                 if(lp2 == 0) {

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

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

  881.                                     lp2 += 2;

  882.                                 }

  883.                                 break;

  884. 

  885.                             case 3:

  886.                                 if(lp2 < 2) {

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

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

  889.                                     lp2 = 3;

  890.                                 }

  891.                                 break;

  892. 

  893.                             case 8:

  894.                                 if(lp2 == 0) {

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

  896. 

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

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

  899. 

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

  901.                                     break;

  902.                                 } else {

  903.                                     rle_v1 = 1;

  904.                                     rle_v2 = (*buf1) - 1;

  905.                                 }

  906.                             case 5:

  907.                             case 7:

  908.                                 LP2_CHECK(buf1,rle_v3,lp2)

  909.                             case 4:

  910.                             case 6:

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

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

  913.                                 lp2 = 4;

  914.                                 break;

  915. 

  916.                             case 9:

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

  918.                                 lv1 = *buf1++;

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

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

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

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

  923.                                     cur_lp[j] = lv;

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

  925.                                 break;

  926. 

  927.                             default:

  928.                                 return;

  929.                             }

  930.                         }

  931. 

  932.                         cur_frm_pos += 4;

  933.                         ref_frm_pos += 4;

  934.                     }

  935. 

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

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

  938.                 }

  939.                 break;

  940. 

  941.             default:

  942.                 return;

  943.             }

  944.         }

  945. 

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

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

  948.                 strip->split_flag = 0;

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

  950. 

  951.                 if(strip->split_direction) {

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

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

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

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

  956.                 } else {

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

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

  959.                 }

  960.                 break;

  961.             }

  962.         }

  963.     }

  964. }

  965. 

  966. static av_cold int indeo3_decode_init(AVCodecContext *avctx)

  967. {

  968.     Indeo3DecodeContext *s = avctx->priv_data;

  969.     int ret = 0;

  970. 

  971.     s->avctx = avctx;

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

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

  974.     avctx->pix_fmt = PIX_FMT_YUV410P;

  975.     avcodec_get_frame_defaults(&s->frame);

  976. 

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

  978.         ret = iv_alloc_frames(s);

  979.     if (ret)

  980.         iv_free_func(s);

  981. 

  982.     return ret;

  983. }

  984. 

  985. static int iv_decode_frame(AVCodecContext *avctx,

  986.                            const uint8_t *buf, int buf_size)

  987. {

  988.     Indeo3DecodeContext *s = avctx->priv_data;

  989.     unsigned int image_width, image_height,

  990.                  chroma_width, chroma_height;

  991.     unsigned int flags, cb_offset, data_size,

  992.                   y_offset, v_offset, u_offset, mc_vector_count;

  993.     const uint8_t *hdr_pos, *buf_pos;

  994. 

  995.     buf_pos = buf;

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

  997. 

  998.     flags = bytestream_get_le16(&buf_pos);

  999.     data_size = bytestream_get_le32(&buf_pos);

  1000.     cb_offset = *buf_pos++;

  1001.     buf_pos += 3; /* skip reserved byte and checksum */

  1002.     image_height = bytestream_get_le16(&buf_pos);

  1003.     image_width  = bytestream_get_le16(&buf_pos);

  1004. 

  1005.     if(av_image_check_size(image_width, image_height, 0, avctx))

  1006.         return -1;

  1007.     if (image_width != avctx->width || image_height != avctx->height) {

  1008.         int ret;

  1009.         avcodec_set_dimensions(avctx, image_width, image_height);

  1010.         s->width  = avctx->width;

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

  1012.         ret = iv_alloc_frames(s);

  1013.         if (ret < 0) {

  1014.             s->width = s->height = 0;

  1015.             return ret;

  1016.         }

  1017.     }

  1018. 

  1019.     chroma_height = ((image_height >> 2) + 3) & 0x7ffc;

  1020.     chroma_width = ((image_width >> 2) + 3) & 0x7ffc;

  1021.     y_offset = bytestream_get_le32(&buf_pos);

  1022.     v_offset = bytestream_get_le32(&buf_pos);

  1023.     u_offset = bytestream_get_le32(&buf_pos);

  1024.     buf_pos += 4; /* reserved */

  1025.     hdr_pos = buf_pos;

  1026.     if(data_size == 0x80) return 4;

  1027. 

  1028.     if(FFMAX3(y_offset, v_offset, u_offset) >= buf_size-16) {

  1029.         av_log(s->avctx, AV_LOG_ERROR, "y/u/v offset outside buffer\n");

  1030.         return -1;

  1031.     }

  1032. 

  1033.     if(flags & 0x200) {

  1034.         s->cur_frame = s->iv_frame + 1;

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

  1036.     } else {

  1037.         s->cur_frame = s->iv_frame;

  1038.         s->ref_frame = s->iv_frame + 1;

  1039.     }

  1040. 

  1041.     buf_pos = buf + 16 + y_offset;

  1042.     mc_vector_count = bytestream_get_le32(&buf_pos);

  1043.     if(2LL*mc_vector_count >= buf_size-16-y_offset) {

  1044.         av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1045.         return -1;

  1046.     }

  1047. 

  1048.     iv_Decode_Chunk(s, s->cur_frame->Ybuf, s->ref_frame->Ybuf, image_width,

  1049.                     image_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1050.                     FFMIN(image_width, 160));

  1051. 

  1052.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1053.     {

  1054. 

  1055.         buf_pos = buf + 16 + v_offset;

  1056.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1057.         if(2LL*mc_vector_count >= buf_size-16-v_offset) {

  1058.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1059.             return -1;

  1060.         }

  1061. 

  1062.         iv_Decode_Chunk(s, s->cur_frame->Vbuf, s->ref_frame->Vbuf, chroma_width,

  1063.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1064.                 FFMIN(chroma_width, 40));

  1065. 

  1066.         buf_pos = buf + 16 + u_offset;

  1067.         mc_vector_count = bytestream_get_le32(&buf_pos);

  1068.         if(2LL*mc_vector_count >= buf_size-16-u_offset) {

  1069.             av_log(s->avctx, AV_LOG_ERROR, "mc_vector_count too large\n");

  1070.             return -1;

  1071.         }

  1072. 

  1073.         iv_Decode_Chunk(s, s->cur_frame->Ubuf, s->ref_frame->Ubuf, chroma_width,

  1074.                 chroma_height, buf_pos + mc_vector_count * 2, cb_offset, hdr_pos, buf_pos,

  1075.                 FFMIN(chroma_width, 40));

  1076. 

  1077.     }

  1078. 

  1079.     return 8;

  1080. }

  1081. 

  1082. static int indeo3_decode_frame(AVCodecContext *avctx,

  1083.                                void *data, int *data_size,

  1084.                                AVPacket *avpkt)

  1085. {

  1086.     const uint8_t *buf = avpkt->data;

  1087.     int buf_size = avpkt->size;

  1088.     Indeo3DecodeContext *s=avctx->priv_data;

  1089.     uint8_t *src, *dest;

  1090.     int y;

  1091. 

  1092.     if (iv_decode_frame(avctx, buf, buf_size) < 0)

  1093.         return -1;

  1094. 

  1095.     if(s->frame.data[0])

  1096.         avctx->release_buffer(avctx, &s->frame);

  1097. 

  1098.     s->frame.reference = 0;

  1099.     if(avctx->get_buffer(avctx, &s->frame) < 0) {

  1100.         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1101.         return -1;

  1102.     }

  1103. 

  1104.     src = s->cur_frame->Ybuf;

  1105.     dest = s->frame.data[0];

  1106.     for (y = 0; y < s->height; y++) {

  1107.         memcpy(dest, src, s->cur_frame->y_w);

  1108.         src += s->cur_frame->y_w;

  1109.         dest += s->frame.linesize[0];

  1110.     }

  1111. 

  1112.     if (!(s->avctx->flags & CODEC_FLAG_GRAY))

  1113.     {

  1114.         src = s->cur_frame->Ubuf;

  1115.         dest = s->frame.data[1];

  1116.         for (y = 0; y < s->height / 4; y++) {

  1117.             memcpy(dest, src, s->cur_frame->uv_w);

  1118.             src += s->cur_frame->uv_w;

  1119.             dest += s->frame.linesize[1];

  1120.         }

  1121. 

  1122.         src = s->cur_frame->Vbuf;

  1123.         dest = s->frame.data[2];

  1124.         for (y = 0; y < s->height / 4; y++) {

  1125.             memcpy(dest, src, s->cur_frame->uv_w);

  1126.             src += s->cur_frame->uv_w;

  1127.             dest += s->frame.linesize[2];

  1128.         }

  1129.     }

  1130. 

  1131.     *data_size=sizeof(AVFrame);

  1132.     *(AVFrame*)data= s->frame;

  1133. 

  1134.     return buf_size;

  1135. }

  1136. 

  1137. static av_cold int indeo3_decode_end(AVCodecContext *avctx)

  1138. {

  1139.     Indeo3DecodeContext *s = avctx->priv_data;

  1140. 

  1141.     iv_free_func(s);

  1142. 

  1143.     if (s->frame.data[0])

  1144.         avctx->release_buffer(avctx, &s->frame);

  1145. 

  1146.     return 0;

  1147. }

  1148. 

  1149. AVCodec ff_indeo3_decoder = {

  1150.     .name           = "indeo3",

  1151.     .type           = AVMEDIA_TYPE_VIDEO,

  1152.     .id             = CODEC_ID_INDEO3,

  1153.     .priv_data_size = sizeof(Indeo3DecodeContext),

  1154.     .init           = indeo3_decode_init,

  1155.     .close          = indeo3_decode_end,

  1156.     .decode         = indeo3_decode_frame,

  1157.     .capabilities   = CODEC_CAP_DR1,

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

  1159. };