libavcodec/ulti.c

   1 /*
   2  * IBM Ultimotion Video Decoder
   3  * Copyright (C) 2004 Konstantin Shishkov
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file libavcodec/ulti.c
  24  * IBM Ultimotion Video Decoder.
  25  */
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30
  31 #include "avcodec.h"
  32 #include "bytestream.h"
  33
  34 #include "ulti_cb.h"
  35
  36 typedef struct UltimotionDecodeContext {
  37     AVCodecContext *avctx;
  38     int width, height, blocks;
  39     AVFrame frame;
  40     const uint8_t *ulti_codebook;
  41 } UltimotionDecodeContext;
  42
  43 static av_cold int ulti_decode_init(AVCodecContext *avctx)
  44 {
  45     UltimotionDecodeContext *s = avctx->priv_data;
  46
  47     s->avctx = avctx;
  48     s->width = avctx->width;
  49     s->height = avctx->height;
  50     s->blocks = (s->width / 8) * (s->height / 8);
  51     avctx->pix_fmt = PIX_FMT_YUV410P;
  52     avctx->coded_frame = (AVFrame*) &s->frame;
  53     s->ulti_codebook = ulti_codebook;
  54
  55     return 0;
  56 }
  57
  58 static av_cold int ulti_decode_end(AVCodecContext *avctx){
  59     UltimotionDecodeContext *s = avctx->priv_data;
  60     AVFrame *pic = &s->frame;
  61
  62     if (pic->data[0])
  63         avctx->release_buffer(avctx, pic);
  64
  65     return 0;
  66 }
  67
  68 static const int block_coords[8] = // 4x4 block coords in 8x8 superblock
  69     { 0, 0, 0, 4, 4, 4, 4, 0};
  70
  71 static const int angle_by_index[4] = { 0, 2, 6, 12};
  72
  73 /* Lookup tables for luma and chroma - used by ulti_convert_yuv() */
  74 static const uint8_t ulti_lumas[64] =
  75     { 0x10, 0x13, 0x17, 0x1A, 0x1E, 0x21, 0x25, 0x28,
  76       0x2C, 0x2F, 0x33, 0x36, 0x3A, 0x3D, 0x41, 0x44,
  77       0x48, 0x4B, 0x4F, 0x52, 0x56, 0x59, 0x5C, 0x60,
  78       0x63, 0x67, 0x6A, 0x6E, 0x71, 0x75, 0x78, 0x7C,
  79       0x7F, 0x83, 0x86, 0x8A, 0x8D, 0x91, 0x94, 0x98,
  80       0x9B, 0x9F, 0xA2, 0xA5, 0xA9, 0xAC, 0xB0, 0xB3,
  81       0xB7, 0xBA, 0xBE, 0xC1, 0xC5, 0xC8, 0xCC, 0xCF,
  82       0xD3, 0xD6, 0xDA, 0xDD, 0xE1, 0xE4, 0xE8, 0xEB};
  83
  84 static const uint8_t ulti_chromas[16] =
  85     { 0x60, 0x67, 0x6D, 0x73, 0x7A, 0x80, 0x86, 0x8D,
  86       0x93, 0x99, 0xA0, 0xA6, 0xAC, 0xB3, 0xB9, 0xC0};
  87
  88 /* convert Ultimotion YUV block (sixteen 6-bit Y samples and
  89  two 4-bit chroma samples) into standard YUV and put it into frame */
  90 static void ulti_convert_yuv(AVFrame *frame, int x, int y,
  91                              uint8_t *luma,int chroma)
  92 {
  93     uint8_t *y_plane, *cr_plane, *cb_plane;
  94     int i;
  95
  96     y_plane = frame->data[0] + x + y * frame->linesize[0];
  97     cr_plane = frame->data[1] + (x / 4) + (y / 4) * frame->linesize[1];
  98     cb_plane = frame->data[2] + (x / 4) + (y / 4) * frame->linesize[2];
  99
 100     cr_plane[0] = ulti_chromas[chroma >> 4];
 101
 102     cb_plane[0] = ulti_chromas[chroma & 0xF];
 103
 104
 105     for(i = 0; i < 16; i++){
 106         y_plane[i & 3] = ulti_lumas[luma[i]];
 107         if((i & 3) == 3) { //next row
 108             y_plane += frame->linesize[0];
 109         }
 110     }
 111 }
 112
 113 /* generate block like in MS Video1 */
 114 static void ulti_pattern(AVFrame *frame, int x, int y,
 115                          int f0, int f1, int Y0, int Y1, int chroma)
 116 {
 117     uint8_t Luma[16];
 118     int mask, i;
 119     for(mask = 0x80, i = 0; mask; mask >>= 1, i++) {
 120         if(f0 & mask)
 121             Luma[i] = Y1;
 122         else
 123             Luma[i] = Y0;
 124     }
 125
 126     for(mask = 0x80, i = 8; mask; mask >>= 1, i++) {
 127         if(f1 & mask)
 128             Luma[i] = Y1;
 129         else
 130             Luma[i] = Y0;
 131     }
 132
 133     ulti_convert_yuv(frame, x, y, Luma, chroma);
 134 }
 135
 136 /* fill block with some gradient */
 137 static void ulti_grad(AVFrame *frame, int x, int y, uint8_t *Y, int chroma, int angle)
 138 {
 139     uint8_t Luma[16];
 140     if(angle & 8) { //reverse order
 141         int t;
 142         angle &= 0x7;
 143         t = Y[0];
 144         Y[0] = Y[3];
 145         Y[3] = t;
 146         t = Y[1];
 147         Y[1] = Y[2];
 148         Y[2] = t;
 149     }
 150     switch(angle){
 151     case 0:
 152         Luma[0]  = Y[0]; Luma[1]  = Y[1]; Luma[2]  = Y[2]; Luma[3]  = Y[3];
 153         Luma[4]  = Y[0]; Luma[5]  = Y[1]; Luma[6]  = Y[2]; Luma[7]  = Y[3];
 154         Luma[8]  = Y[0]; Luma[9]  = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
 155         Luma[12] = Y[0]; Luma[13] = Y[1]; Luma[14] = Y[2]; Luma[15] = Y[3];
 156         break;
 157     case 1:
 158         Luma[0]  = Y[1]; Luma[1]  = Y[2]; Luma[2]  = Y[3]; Luma[3]  = Y[3];
 159         Luma[4]  = Y[0]; Luma[5]  = Y[1]; Luma[6]  = Y[2]; Luma[7]  = Y[3];
 160         Luma[8]  = Y[0]; Luma[9]  = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
 161         Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
 162         break;
 163     case 2:
 164         Luma[0]  = Y[1]; Luma[1]  = Y[2]; Luma[2]  = Y[3]; Luma[3]  = Y[3];
 165         Luma[4]  = Y[1]; Luma[5]  = Y[2]; Luma[6]  = Y[2]; Luma[7]  = Y[3];
 166         Luma[8]  = Y[0]; Luma[9]  = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
 167         Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
 168         break;
 169     case 3:
 170         Luma[0]  = Y[2]; Luma[1]  = Y[3]; Luma[2]  = Y[3]; Luma[3]  = Y[3];
 171         Luma[4]  = Y[1]; Luma[5]  = Y[2]; Luma[6]  = Y[2]; Luma[7]  = Y[3];
 172         Luma[8]  = Y[0]; Luma[9]  = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
 173         Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[1];
 174         break;
 175     case 4:
 176         Luma[0]  = Y[3]; Luma[1]  = Y[3]; Luma[2]  = Y[3]; Luma[3]  = Y[3];
 177         Luma[4]  = Y[2]; Luma[5]  = Y[2]; Luma[6]  = Y[2]; Luma[7]  = Y[2];
 178         Luma[8]  = Y[1]; Luma[9]  = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[1];
 179         Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
 180         break;
 181     case 5:
 182         Luma[0]  = Y[3]; Luma[1]  = Y[3]; Luma[2]  = Y[3]; Luma[3]  = Y[2];
 183         Luma[4]  = Y[3]; Luma[5]  = Y[2]; Luma[6]  = Y[2]; Luma[7]  = Y[1];
 184         Luma[8]  = Y[2]; Luma[9]  = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[0];
 185         Luma[12] = Y[1]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
 186         break;
 187     case 6:
 188         Luma[0]  = Y[3]; Luma[1]  = Y[3]; Luma[2]  = Y[2]; Luma[3]  = Y[2];
 189         Luma[4]  = Y[3]; Luma[5]  = Y[2]; Luma[6]  = Y[1]; Luma[7]  = Y[1];
 190         Luma[8]  = Y[2]; Luma[9]  = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
 191         Luma[12] = Y[1]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
 192         break;
 193     case 7:
 194         Luma[0]  = Y[3]; Luma[1]  = Y[3]; Luma[2]  = Y[2]; Luma[3]  = Y[1];
 195         Luma[4]  = Y[3]; Luma[5]  = Y[2]; Luma[6]  = Y[1]; Luma[7]  = Y[0];
 196         Luma[8]  = Y[3]; Luma[9]  = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
 197         Luma[12] = Y[2]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
 198         break;
 199     default:
 200         Luma[0]  = Y[0]; Luma[1]  = Y[0]; Luma[2]  = Y[1]; Luma[3]  = Y[1];
 201         Luma[4]  = Y[0]; Luma[5]  = Y[0]; Luma[6]  = Y[1]; Luma[7]  = Y[1];
 202         Luma[8]  = Y[2]; Luma[9]  = Y[2]; Luma[10] = Y[3]; Luma[11] = Y[3];
 203         Luma[12] = Y[2]; Luma[13] = Y[2]; Luma[14] = Y[3]; Luma[15] = Y[3];
 204         break;
 205     }
 206
 207     ulti_convert_yuv(frame, x, y, Luma, chroma);
 208 }
 209
 210 static int ulti_decode_frame(AVCodecContext *avctx,
 211                              void *data, int *data_size,
 212                              AVPacket *avpkt)
 213 {
 214     const uint8_t *buf = avpkt->data;
 215     int buf_size = avpkt->size;
 216     UltimotionDecodeContext *s=avctx->priv_data;
 217     int modifier = 0;
 218     int uniq = 0;
 219     int mode = 0;
 220     int blocks = 0;
 221     int done = 0;
 222     int x = 0, y = 0;
 223     int i;
 224     int skip;
 225     int tmp;
 226
 227     if(s->frame.data[0])
 228         avctx->release_buffer(avctx, &s->frame);
 229
 230     s->frame.reference = 1;
 231     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 232     if(avctx->get_buffer(avctx, &s->frame) < 0) {
 233         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 234         return -1;
 235     }
 236
 237     while(!done) {
 238         int idx;
 239         if(blocks >= s->blocks || y >= s->height)
 240             break;//all blocks decoded
 241
 242         idx = *buf++;
 243         if((idx & 0xF8) == 0x70) {
 244             switch(idx) {
 245             case 0x70: //change modifier
 246                 modifier = *buf++;
 247                 if(modifier>1)
 248                     av_log(avctx, AV_LOG_INFO, "warning: modifier must be 0 or 1, got %i\n", modifier);
 249                 break;
 250             case 0x71: // set uniq flag
 251                 uniq = 1;
 252                 break;
 253             case 0x72: //toggle mode
 254                 mode = !mode;
 255                 break;
 256             case 0x73: //end-of-frame
 257                 done = 1;
 258                 break;
 259             case 0x74: //skip some blocks
 260                 skip = *buf++;
 261                 if ((blocks + skip) >= s->blocks)
 262                     break;
 263                 blocks += skip;
 264                 x += skip * 8;
 265                 while(x >= s->width) {
 266                     x -= s->width;
 267                     y += 8;
 268                 }
 269                 break;
 270             default:
 271                 av_log(avctx, AV_LOG_INFO, "warning: unknown escape 0x%02X\n", idx);
 272             }
 273         } else { //handle one block
 274             int code;
 275             int cf;
 276             int angle = 0;
 277             uint8_t Y[4]; // luma samples of block
 278             int tx = 0, ty = 0; //coords of subblock
 279             int chroma = 0;
 280             if (mode || uniq) {
 281                 uniq = 0;
 282                 cf = 1;
 283                 chroma = 0;
 284             } else {
 285                 cf = 0;
 286                 if (idx)
 287                     chroma = *buf++;
 288             }
 289             for (i = 0; i < 4; i++) { // for every subblock
 290                 code = (idx >> (6 - i*2)) & 3; //extract 2 bits
 291                 if(!code) //skip subblock
 292                     continue;
 293                 if(cf)
 294                     chroma = *buf++;
 295                 tx = x + block_coords[i * 2];
 296                 ty = y + block_coords[(i * 2) + 1];
 297                 switch(code) {
 298                 case 1:
 299                     tmp = *buf++;
 300
 301                     angle = angle_by_index[(tmp >> 6) & 0x3];
 302
 303                     Y[0] = tmp & 0x3F;
 304                     Y[1] = Y[0];
 305
 306                     if (angle) {
 307                         Y[2] = Y[0]+1;
 308                         if (Y[2] > 0x3F)
 309                             Y[2] = 0x3F;
 310                         Y[3] = Y[2];
 311                     } else {
 312                         Y[2] = Y[0];
 313                         Y[3] = Y[0];
 314                     }
 315                     break;
 316
 317                 case 2:
 318                     if (modifier) { // unpack four luma samples
 319                         tmp = bytestream_get_be24(&buf);
 320
 321                         Y[0] = (tmp >> 18) & 0x3F;
 322                         Y[1] = (tmp >> 12) & 0x3F;
 323                         Y[2] = (tmp >> 6) & 0x3F;
 324                         Y[3] = tmp & 0x3F;
 325                         angle = 16;
 326                     } else { // retrieve luma samples from codebook
 327                         tmp = bytestream_get_be16(&buf);
 328
 329                         angle = (tmp >> 12) & 0xF;
 330                         tmp &= 0xFFF;
 331                         tmp <<= 2;
 332                         Y[0] = s->ulti_codebook[tmp];
 333                         Y[1] = s->ulti_codebook[tmp + 1];
 334                         Y[2] = s->ulti_codebook[tmp + 2];
 335                         Y[3] = s->ulti_codebook[tmp + 3];
 336                     }
 337                     break;
 338
 339                 case 3:
 340                     if (modifier) { // all 16 luma samples
 341                         uint8_t Luma[16];
 342
 343                         tmp = bytestream_get_be24(&buf);
 344                         Luma[0] = (tmp >> 18) & 0x3F;
 345                         Luma[1] = (tmp >> 12) & 0x3F;
 346                         Luma[2] = (tmp >> 6) & 0x3F;
 347                         Luma[3] = tmp & 0x3F;
 348
 349                         tmp = bytestream_get_be24(&buf);
 350                         Luma[4] = (tmp >> 18) & 0x3F;
 351                         Luma[5] = (tmp >> 12) & 0x3F;
 352                         Luma[6] = (tmp >> 6) & 0x3F;
 353                         Luma[7] = tmp & 0x3F;
 354
 355                         tmp = bytestream_get_be24(&buf);
 356                         Luma[8] = (tmp >> 18) & 0x3F;
 357                         Luma[9] = (tmp >> 12) & 0x3F;
 358                         Luma[10] = (tmp >> 6) & 0x3F;
 359                         Luma[11] = tmp & 0x3F;
 360
 361                         tmp = bytestream_get_be24(&buf);
 362                         Luma[12] = (tmp >> 18) & 0x3F;
 363                         Luma[13] = (tmp >> 12) & 0x3F;
 364                         Luma[14] = (tmp >> 6) & 0x3F;
 365                         Luma[15] = tmp & 0x3F;
 366
 367                         ulti_convert_yuv(&s->frame, tx, ty, Luma, chroma);
 368                     } else {
 369                         tmp = *buf++;
 370                         if(tmp & 0x80) {
 371                             angle = (tmp >> 4) & 0x7;
 372                             tmp = (tmp << 8) + *buf++;
 373                             Y[0] = (tmp >> 6) & 0x3F;
 374                             Y[1] = tmp & 0x3F;
 375                             Y[2] = (*buf++) & 0x3F;
 376                             Y[3] = (*buf++) & 0x3F;
 377                             ulti_grad(&s->frame, tx, ty, Y, chroma, angle); //draw block
 378                         } else { // some patterns
 379                             int f0, f1;
 380                             f0 = *buf++;
 381                             f1 = tmp;
 382                             Y[0] = (*buf++) & 0x3F;
 383                             Y[1] = (*buf++) & 0x3F;
 384                             ulti_pattern(&s->frame, tx, ty, f1, f0, Y[0], Y[1], chroma);
 385                         }
 386                     }
 387                     break;
 388                 }
 389                 if(code != 3)
 390                     ulti_grad(&s->frame, tx, ty, Y, chroma, angle); // draw block
 391             }
 392             blocks++;
 393                 x += 8;
 394             if(x >= s->width) {
 395                 x = 0;
 396                 y += 8;
 397             }
 398         }
 399     }
 400
 401     *data_size=sizeof(AVFrame);
 402     *(AVFrame*)data= s->frame;
 403
 404     return buf_size;
 405 }
 406
 407 AVCodec ulti_decoder = {
 408     "ultimotion",
 409     CODEC_TYPE_VIDEO,
 410     CODEC_ID_ULTI,
 411     sizeof(UltimotionDecodeContext),
 412     ulti_decode_init,
 413     NULL,
 414     ulti_decode_end,
 415     ulti_decode_frame,
 416     CODEC_CAP_DR1,
 417     NULL,
 418     .long_name = NULL_IF_CONFIG_SMALL("IBM UltiMotion"),
 419 };
 420