libavcodec/roqvideodec.c

   1 /*
   2  * Copyright (C) 2003 the ffmpeg project
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * id RoQ Video Decoder by Dr. Tim Ferguson
  24  * For more information about the id RoQ format, visit:
  25  *   http://www.csse.monash.edu.au/~timf/
  26  */
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include "avcodec.h"
  33 #include "bytestream.h"
  34 #include "roqvideo.h"
  35
  36 static void roqvideo_decode_frame(RoqContext *ri)
  37 {
  38     unsigned int chunk_id = 0, chunk_arg = 0;
  39     unsigned long chunk_size = 0;
  40     int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
  41     int vqid, xpos, ypos, xp, yp, x, y, mx, my;
  42     int frame_stats[2][4] = {{0},{0}};
  43     roq_qcell *qcell;
  44     int64_t chunk_start;
  45
  46     while (bytestream2_get_bytes_left(&ri->gb) > 0) {
  47         chunk_id   = bytestream2_get_le16(&ri->gb);
  48         chunk_size = bytestream2_get_le32(&ri->gb);
  49         chunk_arg  = bytestream2_get_le16(&ri->gb);
  50
  51         if(chunk_id == RoQ_QUAD_VQ)
  52             break;
  53         if(chunk_id == RoQ_QUAD_CODEBOOK) {
  54             if((nv1 = chunk_arg >> 8) == 0)
  55                 nv1 = 256;
  56             if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
  57                 nv2 = 256;
  58             for(i = 0; i < nv1; i++) {
  59                 ri->cb2x2[i].y[0] = bytestream2_get_byte(&ri->gb);
  60                 ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
  61                 ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
  62                 ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
  63                 ri->cb2x2[i].u    = bytestream2_get_byte(&ri->gb);
  64                 ri->cb2x2[i].v    = bytestream2_get_byte(&ri->gb);
  65             }
  66             for(i = 0; i < nv2; i++)
  67                 for(j = 0; j < 4; j++)
  68                     ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
  69         }
  70     }
  71
  72     chunk_start = bytestream2_tell(&ri->gb);
  73     xpos = ypos = 0;
  74     while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
  75         for (yp = ypos; yp < ypos + 16; yp += 8)
  76             for (xp = xpos; xp < xpos + 16; xp += 8) {
  77                 if (vqflg_pos < 0) {
  78                     vqflg = bytestream2_get_le16(&ri->gb);
  79                     vqflg_pos = 7;
  80                 }
  81                 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
  82                 frame_stats[0][vqid]++;
  83                 vqflg_pos--;
  84
  85                 switch(vqid) {
  86                 case RoQ_ID_MOT:
  87                     break;
  88                 case RoQ_ID_FCC: {
  89                     int byte = bytestream2_get_byte(&ri->gb);
  90                     mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
  91                     my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
  92                     ff_apply_motion_8x8(ri, xp, yp, mx, my);
  93                     break;
  94                 }
  95                 case RoQ_ID_SLD:
  96                     qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
  97                     ff_apply_vector_4x4(ri, xp,     yp,     ri->cb2x2 + qcell->idx[0]);
  98                     ff_apply_vector_4x4(ri, xp + 4, yp,     ri->cb2x2 + qcell->idx[1]);
  99                     ff_apply_vector_4x4(ri, xp,     yp + 4, ri->cb2x2 + qcell->idx[2]);
 100                     ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
 101                     break;
 102                 case RoQ_ID_CCC:
 103                     for (k = 0; k < 4; k++) {
 104                         x = xp; y = yp;
 105                         if(k & 0x01) x += 4;
 106                         if(k & 0x02) y += 4;
 107
 108                         if (vqflg_pos < 0) {
 109                             vqflg = bytestream2_get_le16(&ri->gb);
 110                             vqflg_pos = 7;
 111                         }
 112                         vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
 113                         frame_stats[1][vqid]++;
 114                         vqflg_pos--;
 115                         switch(vqid) {
 116                         case RoQ_ID_MOT:
 117                             break;
 118                         case RoQ_ID_FCC: {
 119                             int byte = bytestream2_get_byte(&ri->gb);
 120                             mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
 121                             my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
 122                             ff_apply_motion_4x4(ri, x, y, mx, my);
 123                             break;
 124                         }
 125                         case RoQ_ID_SLD:
 126                             qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
 127                             ff_apply_vector_2x2(ri, x,     y,     ri->cb2x2 + qcell->idx[0]);
 128                             ff_apply_vector_2x2(ri, x + 2, y,     ri->cb2x2 + qcell->idx[1]);
 129                             ff_apply_vector_2x2(ri, x,     y + 2, ri->cb2x2 + qcell->idx[2]);
 130                             ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
 131                             break;
 132                         case RoQ_ID_CCC:
 133                             ff_apply_vector_2x2(ri, x,     y,     ri->cb2x2 + bytestream2_get_byte(&ri->gb));
 134                             ff_apply_vector_2x2(ri, x + 2, y,     ri->cb2x2 + bytestream2_get_byte(&ri->gb));
 135                             ff_apply_vector_2x2(ri, x,     y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
 136                             ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
 137                             break;
 138                         }
 139                     }
 140                     break;
 141                 default:
 142                     av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
 143             }
 144         }
 145
 146         xpos += 16;
 147         if (xpos >= ri->width) {
 148             xpos -= ri->width;
 149             ypos += 16;
 150         }
 151         if(ypos >= ri->height)
 152             break;
 153     }
 154 }
 155
 156
 157 static av_cold int roq_decode_init(AVCodecContext *avctx)
 158 {
 159     RoqContext *s = avctx->priv_data;
 160
 161     s->avctx = avctx;
 162     s->width = avctx->width;
 163     s->height = avctx->height;
 164     s->last_frame    = &s->frames[0];
 165     s->current_frame = &s->frames[1];
 166     avctx->pix_fmt = AV_PIX_FMT_YUV444P;
 167
 168     return 0;
 169 }
 170
 171 static int roq_decode_frame(AVCodecContext *avctx,
 172                             void *data, int *got_frame,
 173                             AVPacket *avpkt)
 174 {
 175     const uint8_t *buf = avpkt->data;
 176     int buf_size = avpkt->size;
 177     RoqContext *s = avctx->priv_data;
 178     int copy= !s->current_frame->data[0];
 179
 180     s->current_frame->reference = 3;
 181     if (avctx->reget_buffer(avctx, s->current_frame)) {
 182         av_log(avctx, AV_LOG_ERROR, "  RoQ: get_buffer() failed\n");
 183         return -1;
 184     }
 185
 186     if(copy)
 187         av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
 188                         avctx->pix_fmt, avctx->width, avctx->height);
 189
 190     bytestream2_init(&s->gb, buf, buf_size);
 191     roqvideo_decode_frame(s);
 192
 193     *got_frame      = 1;
 194     *(AVFrame*)data = *s->current_frame;
 195
 196     /* shuffle frames */
 197     FFSWAP(AVFrame *, s->current_frame, s->last_frame);
 198
 199     return buf_size;
 200 }
 201
 202 static av_cold int roq_decode_end(AVCodecContext *avctx)
 203 {
 204     RoqContext *s = avctx->priv_data;
 205
 206     /* release the last frame */
 207     if (s->last_frame->data[0])
 208         avctx->release_buffer(avctx, s->last_frame);
 209     if (s->current_frame->data[0])
 210         avctx->release_buffer(avctx, s->current_frame);
 211
 212     return 0;
 213 }
 214
 215 AVCodec ff_roq_decoder = {
 216     .name           = "roqvideo",
 217     .type           = AVMEDIA_TYPE_VIDEO,
 218     .id             = AV_CODEC_ID_ROQ,
 219     .priv_data_size = sizeof(RoqContext),
 220     .init           = roq_decode_init,
 221     .close          = roq_decode_end,
 222     .decode         = roq_decode_frame,
 223     .capabilities   = CODEC_CAP_DR1,
 224     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ video"),
 225 };