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 * @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 36static 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, bpos, xpos, ypos, xp, yp, x, y, mx, my; 42 int frame_stats[2][4] = {{0},{0}}; 43 roq_qcell *qcell; 44 const unsigned char *buf = ri->buf; 45 const unsigned char *buf_end = ri->buf + ri->size; 46 47 while (buf < buf_end) { 48 chunk_id = bytestream_get_le16(&buf); 49 chunk_size = bytestream_get_le32(&buf); 50 chunk_arg = bytestream_get_le16(&buf); 51 52 if(chunk_id == RoQ_QUAD_VQ) 53 break; 54 if(chunk_id == RoQ_QUAD_CODEBOOK) { 55 if((nv1 = chunk_arg >> 8) == 0) 56 nv1 = 256; 57 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size) 58 nv2 = 256; 59 for(i = 0; i < nv1; i++) { 60 ri->cb2x2[i].y[0] = *buf++; 61 ri->cb2x2[i].y[1] = *buf++; 62 ri->cb2x2[i].y[2] = *buf++; 63 ri->cb2x2[i].y[3] = *buf++; 64 ri->cb2x2[i].u = *buf++; 65 ri->cb2x2[i].v = *buf++; 66 } 67 for(i = 0; i < nv2; i++) 68 for(j = 0; j < 4; j++) 69 ri->cb4x4[i].idx[j] = *buf++; 70 } 71 } 72 73 bpos = xpos = ypos = 0; 74 while(bpos < 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 = buf[bpos++]; vqflg |= (buf[bpos++] << 8); 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 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8)); 90 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg); 91 ff_apply_motion_8x8(ri, xp, yp, mx, my); 92 break; 93 case RoQ_ID_SLD: 94 qcell = ri->cb4x4 + buf[bpos++]; 95 ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]); 96 ff_apply_vector_4x4(ri, xp+4, yp, ri->cb2x2 + qcell->idx[1]); 97 ff_apply_vector_4x4(ri, xp, yp+4, ri->cb2x2 + qcell->idx[2]); 98 ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cb2x2 + qcell->idx[3]); 99 break; 100 case RoQ_ID_CCC: 101 for (k = 0; k < 4; k++) { 102 x = xp; y = yp; 103 if(k & 0x01) x += 4; 104 if(k & 0x02) y += 4; 105 106 if (vqflg_pos < 0) { 107 vqflg = buf[bpos++]; 108 vqflg |= (buf[bpos++] << 8); 109 vqflg_pos = 7; 110 } 111 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3; 112 frame_stats[1][vqid]++; 113 vqflg_pos--; 114 switch(vqid) { 115 case RoQ_ID_MOT: 116 break; 117 case RoQ_ID_FCC: 118 mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8)); 119 my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg); 120 ff_apply_motion_4x4(ri, x, y, mx, my); 121 break; 122 case RoQ_ID_SLD: 123 qcell = ri->cb4x4 + buf[bpos++]; 124 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]); 125 ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + qcell->idx[1]); 126 ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + qcell->idx[2]); 127 ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + qcell->idx[3]); 128 break; 129 case RoQ_ID_CCC: 130 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + buf[bpos]); 131 ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + buf[bpos+1]); 132 ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + buf[bpos+2]); 133 ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + buf[bpos+3]); 134 bpos += 4; 135 break; 136 } 137 } 138 break; 139 default: 140 av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid); 141 } 142 } 143 144 xpos += 16; 145 if (xpos >= ri->width) { 146 xpos -= ri->width; 147 ypos += 16; 148 } 149 if(ypos >= ri->height) 150 break; 151 } 152} 153 154 155static av_cold int roq_decode_init(AVCodecContext *avctx) 156{ 157 RoqContext *s = avctx->priv_data; 158 159 s->avctx = avctx; 160 s->width = avctx->width; 161 s->height = avctx->height; 162 s->last_frame = &s->frames[0]; 163 s->current_frame = &s->frames[1]; 164 avctx->pix_fmt = PIX_FMT_YUV444P; 165 166 return 0; 167} 168 169static int roq_decode_frame(AVCodecContext *avctx, 170 void *data, int *data_size, 171 AVPacket *avpkt) 172{ 173 const uint8_t *buf = avpkt->data; 174 int buf_size = avpkt->size; 175 RoqContext *s = avctx->priv_data; 176 int copy= !s->current_frame->data[0]; 177 178 if (avctx->reget_buffer(avctx, s->current_frame)) { 179 av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n"); 180 return -1; 181 } 182 183 if(copy) 184 av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame, 185 avctx->pix_fmt, avctx->width, avctx->height); 186 187 s->buf = buf; 188 s->size = buf_size; 189 roqvideo_decode_frame(s); 190 191 *data_size = sizeof(AVFrame); 192 *(AVFrame*)data = *s->current_frame; 193 194 /* shuffle frames */ 195 FFSWAP(AVFrame *, s->current_frame, s->last_frame); 196 197 return buf_size; 198} 199 200static av_cold int roq_decode_end(AVCodecContext *avctx) 201{ 202 RoqContext *s = avctx->priv_data; 203 204 /* release the last frame */ 205 if (s->last_frame->data[0]) 206 avctx->release_buffer(avctx, s->last_frame); 207 if (s->current_frame->data[0]) 208 avctx->release_buffer(avctx, s->current_frame); 209 210 return 0; 211} 212 213AVCodec roq_decoder = { 214 "roqvideo", 215 AVMEDIA_TYPE_VIDEO, 216 CODEC_ID_ROQ, 217 sizeof(RoqContext), 218 roq_decode_init, 219 NULL, 220 roq_decode_end, 221 roq_decode_frame, 222 CODEC_CAP_DR1, 223 .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"), 224}; 225