libavcodec/roqvideo.c

   1 /*
   2  * Copyright (C) 2003 the ffmpeg project
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  *
  20  */
  21
  22 /**
  23  * @file roqvideo.c
  24  * Id RoQ Video Decoder by Dr. Tim Ferguson
  25  * For more information about the Id RoQ format, visit:
  26  *   http://www.csse.monash.edu.au/~timf/
  27  */
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 #include "avcodec.h"
  35 #include "bytestream.h"
  36 #include "dsputil.h"
  37
  38 typedef struct {
  39   unsigned char y[4];
  40   unsigned char u, v;
  41 } roq_cell;
  42
  43 typedef struct {
  44   int idx[4];
  45 } roq_qcell;
  46
  47 #define avg2(a,b) av_clip_uint8(((int)(a)+(int)(b)+1)>>1)
  48 #define avg4(a,b,c,d) av_clip_uint8(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)
  49
  50 typedef struct RoqContext {
  51
  52     AVCodecContext *avctx;
  53     DSPContext dsp;
  54     AVFrame frames[2];
  55     AVFrame *last_frame;
  56     AVFrame *current_frame;
  57     int first_frame;
  58     int y_stride;
  59     int c_stride;
  60
  61     roq_cell cells[256];
  62     roq_qcell qcells[256];
  63
  64     unsigned char *buf;
  65     int size;
  66
  67 } RoqContext;
  68
  69 #define RoQ_INFO              0x1001
  70 #define RoQ_QUAD_CODEBOOK     0x1002
  71 #define RoQ_QUAD_VQ           0x1011
  72 #define RoQ_SOUND_MONO        0x1020
  73 #define RoQ_SOUND_STEREO      0x1021
  74
  75 #define RoQ_ID_MOT              0x00
  76 #define RoQ_ID_FCC              0x01
  77 #define RoQ_ID_SLD              0x02
  78 #define RoQ_ID_CCC              0x03
  79
  80 #define get_byte(in_buffer) *(in_buffer++)
  81
  82
  83 void ff_apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
  84 {
  85     unsigned char *yptr;
  86
  87     yptr = ri->current_frame->data[0] + (y * ri->y_stride) + x;
  88     *yptr++ = cell->y[0];
  89     *yptr++ = cell->y[1];
  90     yptr += (ri->y_stride - 2);
  91     *yptr++ = cell->y[2];
  92     *yptr++ = cell->y[3];
  93     ri->current_frame->data[1][(y/2) * (ri->c_stride) + x/2] = cell->u;
  94     ri->current_frame->data[2][(y/2) * (ri->c_stride) + x/2] = cell->v;
  95 }
  96
  97 void ff_apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
  98 {
  99     unsigned long row_inc, c_row_inc;
 100     register unsigned char y0, y1, u, v;
 101     unsigned char *yptr, *uptr, *vptr;
 102
 103     yptr = ri->current_frame->data[0] + (y * ri->y_stride) + x;
 104     uptr = ri->current_frame->data[1] + (y/2) * (ri->c_stride) + x/2;
 105     vptr = ri->current_frame->data[2] + (y/2) * (ri->c_stride) + x/2;
 106
 107     row_inc = ri->y_stride - 4;
 108     c_row_inc = (ri->c_stride) - 2;
 109     *yptr++ = y0 = cell->y[0]; *uptr++ = u = cell->u; *vptr++ = v = cell->v;
 110     *yptr++ = y0;
 111     *yptr++ = y1 = cell->y[1]; *uptr++ = u; *vptr++ = v;
 112     *yptr++ = y1;
 113
 114     yptr += row_inc;
 115
 116     *yptr++ = y0;
 117     *yptr++ = y0;
 118     *yptr++ = y1;
 119     *yptr++ = y1;
 120
 121     yptr += row_inc; uptr += c_row_inc; vptr += c_row_inc;
 122
 123     *yptr++ = y0 = cell->y[2]; *uptr++ = u; *vptr++ = v;
 124     *yptr++ = y0;
 125     *yptr++ = y1 = cell->y[3]; *uptr++ = u; *vptr++ = v;
 126     *yptr++ = y1;
 127
 128     yptr += row_inc;
 129
 130     *yptr++ = y0;
 131     *yptr++ = y0;
 132     *yptr++ = y1;
 133     *yptr++ = y1;
 134 }
 135
 136 void ff_apply_motion_4x4(RoqContext *ri, int x, int y,
 137                              int deltax, int deltay)
 138 {
 139     int i, hw, mx, my;
 140     unsigned char *pa, *pb;
 141
 142     mx = x + deltax;
 143     my = y + deltay;
 144
 145     /* check MV against frame boundaries */
 146     if ((mx < 0) || (mx > ri->avctx->width - 4) ||
 147         (my < 0) || (my > ri->avctx->height - 4)) {
 148         av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
 149             mx, my, ri->avctx->width, ri->avctx->height);
 150         return;
 151     }
 152
 153     pa = ri->current_frame->data[0] + (y * ri->y_stride) + x;
 154     pb = ri->last_frame->data[0] + (my * ri->y_stride) + mx;
 155     for(i = 0; i < 4; i++) {
 156         pa[0] = pb[0];
 157         pa[1] = pb[1];
 158         pa[2] = pb[2];
 159         pa[3] = pb[3];
 160         pa += ri->y_stride;
 161         pb += ri->y_stride;
 162     }
 163
 164     hw = ri->y_stride/2;
 165     pa = ri->current_frame->data[1] + (y * ri->y_stride)/4 + x/2;
 166     pb = ri->last_frame->data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
 167
 168     for(i = 0; i < 2; i++) {
 169         switch(((my & 0x01) << 1) | (mx & 0x01)) {
 170
 171         case 0:
 172             pa[0] = pb[0];
 173             pa[1] = pb[1];
 174             pa[hw] = pb[hw];
 175             pa[hw+1] = pb[hw+1];
 176             break;
 177
 178         case 1:
 179             pa[0] = avg2(pb[0], pb[1]);
 180             pa[1] = avg2(pb[1], pb[2]);
 181             pa[hw] = avg2(pb[hw], pb[hw+1]);
 182             pa[hw+1] = avg2(pb[hw+1], pb[hw+2]);
 183             break;
 184
 185         case 2:
 186             pa[0] = avg2(pb[0], pb[hw]);
 187             pa[1] = avg2(pb[1], pb[hw+1]);
 188             pa[hw] = avg2(pb[hw], pb[hw*2]);
 189             pa[hw+1] = avg2(pb[hw+1], pb[(hw*2)+1]);
 190             break;
 191
 192         case 3:
 193             pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
 194             pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
 195             pa[hw] = avg4(pb[hw], pb[hw+1], pb[hw*2], pb[(hw*2)+1]);
 196             pa[hw+1] = avg4(pb[hw+1], pb[hw+2], pb[(hw*2)+1], pb[(hw*2)+1]);
 197             break;
 198         }
 199
 200         pa = ri->current_frame->data[2] + (y * ri->y_stride)/4 + x/2;
 201         pb = ri->last_frame->data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
 202     }
 203 }
 204
 205 void ff_apply_motion_8x8(RoqContext *ri, int x, int y,
 206                              int deltax, int deltay)
 207 {
 208     int mx, my, i, j, hw;
 209     unsigned char *pa, *pb;
 210
 211     mx = x + deltax;
 212     my = y + deltay;
 213
 214     /* check MV against frame boundaries */
 215     if ((mx < 0) || (mx > ri->avctx->width - 8) ||
 216         (my < 0) || (my > ri->avctx->height - 8)) {
 217         av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
 218             mx, my, ri->avctx->width, ri->avctx->height);
 219         return;
 220     }
 221
 222     pa = ri->current_frame->data[0] + (y * ri->y_stride) + x;
 223     pb = ri->last_frame->data[0] + (my * ri->y_stride) + mx;
 224     for(i = 0; i < 8; i++) {
 225         pa[0] = pb[0];
 226         pa[1] = pb[1];
 227         pa[2] = pb[2];
 228         pa[3] = pb[3];
 229         pa[4] = pb[4];
 230         pa[5] = pb[5];
 231         pa[6] = pb[6];
 232         pa[7] = pb[7];
 233         pa += ri->y_stride;
 234         pb += ri->y_stride;
 235     }
 236
 237     hw = ri->c_stride;
 238     pa = ri->current_frame->data[1] + (y * ri->y_stride)/4 + x/2;
 239     pb = ri->last_frame->data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
 240     for(j = 0; j < 2; j++) {
 241         for(i = 0; i < 4; i++) {
 242             switch(((my & 0x01) << 1) | (mx & 0x01)) {
 243
 244             case 0:
 245                 pa[0] = pb[0];
 246                 pa[1] = pb[1];
 247                 pa[2] = pb[2];
 248                 pa[3] = pb[3];
 249                 break;
 250
 251             case 1:
 252                 pa[0] = avg2(pb[0], pb[1]);
 253                 pa[1] = avg2(pb[1], pb[2]);
 254                 pa[2] = avg2(pb[2], pb[3]);
 255                 pa[3] = avg2(pb[3], pb[4]);
 256                 break;
 257
 258             case 2:
 259                 pa[0] = avg2(pb[0], pb[hw]);
 260                 pa[1] = avg2(pb[1], pb[hw+1]);
 261                 pa[2] = avg2(pb[2], pb[hw+2]);
 262                 pa[3] = avg2(pb[3], pb[hw+3]);
 263                 break;
 264
 265             case 3:
 266                 pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
 267                 pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
 268                 pa[2] = avg4(pb[2], pb[3], pb[hw+2], pb[hw+3]);
 269                 pa[3] = avg4(pb[3], pb[4], pb[hw+3], pb[hw+4]);
 270                 break;
 271             }
 272             pa += ri->c_stride;
 273             pb += ri->c_stride;
 274         }
 275
 276         pa = ri->current_frame->data[2] + (y * ri->y_stride)/4 + x/2;
 277         pb = ri->last_frame->data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
 278     }
 279 }
 280
 281 static void roqvideo_decode_frame(RoqContext *ri)
 282 {
 283     unsigned int chunk_id = 0, chunk_arg = 0;
 284     unsigned long chunk_size = 0;
 285     int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
 286     int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
 287     int frame_stats[2][4] = {{0},{0}};
 288     roq_qcell *qcell;
 289     unsigned char *buf = ri->buf;
 290     unsigned char *buf_end = ri->buf + ri->size;
 291
 292     while (buf < buf_end) {
 293         chunk_id = bytestream_get_le16(&buf);
 294         chunk_size = bytestream_get_le32(&buf);
 295         chunk_arg = bytestream_get_le16(&buf);
 296
 297         if(chunk_id == RoQ_QUAD_VQ)
 298             break;
 299         if(chunk_id == RoQ_QUAD_CODEBOOK) {
 300             if((nv1 = chunk_arg >> 8) == 0)
 301                 nv1 = 256;
 302             if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
 303                 nv2 = 256;
 304             for(i = 0; i < nv1; i++) {
 305                 ri->cells[i].y[0] = get_byte(buf);
 306                 ri->cells[i].y[1] = get_byte(buf);
 307                 ri->cells[i].y[2] = get_byte(buf);
 308                 ri->cells[i].y[3] = get_byte(buf);
 309                 ri->cells[i].u = get_byte(buf);
 310                 ri->cells[i].v = get_byte(buf);
 311             }
 312             for(i = 0; i < nv2; i++)
 313                 for(j = 0; j < 4; j++)
 314                     ri->qcells[i].idx[j] = get_byte(buf);
 315         }
 316     }
 317
 318     bpos = xpos = ypos = 0;
 319     while(bpos < chunk_size) {
 320         for (yp = ypos; yp < ypos + 16; yp += 8)
 321             for (xp = xpos; xp < xpos + 16; xp += 8) {
 322                 if (vqflg_pos < 0) {
 323                     vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
 324                     vqflg_pos = 7;
 325                 }
 326                 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
 327                 frame_stats[0][vqid]++;
 328                 vqflg_pos--;
 329
 330                 switch(vqid) {
 331                 case RoQ_ID_MOT:
 332                     ff_apply_motion_8x8(ri, xp, yp, 0, 0);
 333                     break;
 334                 case RoQ_ID_FCC:
 335                     mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
 336                     my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
 337                     ff_apply_motion_8x8(ri, xp, yp, mx, my);
 338                     break;
 339                 case RoQ_ID_SLD:
 340                     qcell = ri->qcells + buf[bpos++];
 341                     ff_apply_vector_4x4(ri, xp, yp, ri->cells + qcell->idx[0]);
 342                     ff_apply_vector_4x4(ri, xp+4, yp, ri->cells + qcell->idx[1]);
 343                     ff_apply_vector_4x4(ri, xp, yp+4, ri->cells + qcell->idx[2]);
 344                     ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cells + qcell->idx[3]);
 345                     break;
 346                 case RoQ_ID_CCC:
 347                     for (k = 0; k < 4; k++) {
 348                         x = xp; y = yp;
 349                         if(k & 0x01) x += 4;
 350                         if(k & 0x02) y += 4;
 351
 352                         if (vqflg_pos < 0) {
 353                             vqflg = buf[bpos++];
 354                             vqflg |= (buf[bpos++] << 8);
 355                             vqflg_pos = 7;
 356                         }
 357                         vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
 358                         frame_stats[1][vqid]++;
 359                         vqflg_pos--;
 360                         switch(vqid) {
 361                         case RoQ_ID_MOT:
 362                             ff_apply_motion_4x4(ri, x, y, 0, 0);
 363                             break;
 364                         case RoQ_ID_FCC:
 365                             mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
 366                             my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
 367                             ff_apply_motion_4x4(ri, x, y, mx, my);
 368                             break;
 369                         case RoQ_ID_SLD:
 370                             qcell = ri->qcells + buf[bpos++];
 371                             ff_apply_vector_2x2(ri, x, y, ri->cells + qcell->idx[0]);
 372                             ff_apply_vector_2x2(ri, x+2, y, ri->cells + qcell->idx[1]);
 373                             ff_apply_vector_2x2(ri, x, y+2, ri->cells + qcell->idx[2]);
 374                             ff_apply_vector_2x2(ri, x+2, y+2, ri->cells + qcell->idx[3]);
 375                             break;
 376                         case RoQ_ID_CCC:
 377                             ff_apply_vector_2x2(ri, x, y, ri->cells + buf[bpos]);
 378                             ff_apply_vector_2x2(ri, x+2, y, ri->cells + buf[bpos+1]);
 379                             ff_apply_vector_2x2(ri, x, y+2, ri->cells + buf[bpos+2]);
 380                             ff_apply_vector_2x2(ri, x+2, y+2, ri->cells + buf[bpos+3]);
 381                             bpos += 4;
 382                             break;
 383                         }
 384                     }
 385                     break;
 386                 default:
 387                     av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
 388             }
 389         }
 390
 391         xpos += 16;
 392         if (xpos >= ri->avctx->width) {
 393             xpos -= ri->avctx->width;
 394             ypos += 16;
 395         }
 396         if(ypos >= ri->avctx->height)
 397             break;
 398     }
 399 }
 400
 401
 402 static int roq_decode_init(AVCodecContext *avctx)
 403 {
 404     RoqContext *s = avctx->priv_data;
 405
 406     s->avctx = avctx;
 407     s->first_frame = 1;
 408     s->last_frame    = &s->frames[0];
 409     s->current_frame = &s->frames[1];
 410     avctx->pix_fmt = PIX_FMT_YUV420P;
 411     dsputil_init(&s->dsp, avctx);
 412
 413     return 0;
 414 }
 415
 416 static int roq_decode_frame(AVCodecContext *avctx,
 417                             void *data, int *data_size,
 418                             uint8_t *buf, int buf_size)
 419 {
 420     RoqContext *s = avctx->priv_data;
 421
 422     if (avctx->get_buffer(avctx, s->current_frame)) {
 423         av_log(avctx, AV_LOG_ERROR, "  RoQ: get_buffer() failed\n");
 424         return -1;
 425     }
 426     s->y_stride = s->current_frame->linesize[0];
 427     s->c_stride = s->current_frame->linesize[1];
 428
 429     s->buf = buf;
 430     s->size = buf_size;
 431     roqvideo_decode_frame(s);
 432
 433     /* release the last frame if it is allocated */
 434     if (s->first_frame)
 435         s->first_frame = 0;
 436     else
 437         avctx->release_buffer(avctx, s->last_frame);
 438
 439     *data_size = sizeof(AVFrame);
 440     *(AVFrame*)data = *s->current_frame;
 441
 442     /* shuffle frames */
 443     FFSWAP(AVFrame *, s->current_frame, s->last_frame);
 444
 445     return buf_size;
 446 }
 447
 448 static int roq_decode_end(AVCodecContext *avctx)
 449 {
 450     RoqContext *s = avctx->priv_data;
 451
 452     /* release the last frame */
 453     if (s->last_frame->data[0])
 454         avctx->release_buffer(avctx, s->last_frame);
 455
 456     return 0;
 457 }
 458
 459 AVCodec roq_decoder = {
 460     "roqvideo",
 461     CODEC_TYPE_VIDEO,
 462     CODEC_ID_ROQ,
 463     sizeof(RoqContext),
 464     roq_decode_init,
 465     NULL,
 466     roq_decode_end,
 467     roq_decode_frame,
 468     CODEC_CAP_DR1,
 469 };