1/* 2 * RV30 decoder 3 * Copyright (c) 2007 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 24 * RV30 decoder 25 */ 26 27#include "avcodec.h" 28#include "mpegutils.h" 29#include "mpegvideo.h" 30#include "golomb.h" 31 32#include "rv34.h" 33#include "rv30data.h" 34 35 36static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si) 37{ 38 AVCodecContext *avctx = r->s.avctx; 39 int mb_bits; 40 int w = r->s.width, h = r->s.height; 41 int mb_size; 42 int rpr; 43 44 memset(si, 0, sizeof(SliceInfo)); 45 if(get_bits(gb, 3)) 46 return -1; 47 si->type = get_bits(gb, 2); 48 if(si->type == 1) si->type = 0; 49 if(get_bits1(gb)) 50 return -1; 51 si->quant = get_bits(gb, 5); 52 skip_bits1(gb); 53 si->pts = get_bits(gb, 13); 54 rpr = get_bits(gb, av_log2(r->max_rpr) + 1); 55 if(rpr){ 56 if (rpr > r->max_rpr) { 57 av_log(avctx, AV_LOG_ERROR, "rpr too large\n"); 58 return AVERROR_INVALIDDATA; 59 } 60 61 if (avctx->extradata_size < rpr * 2 + 8) { 62 av_log(avctx, AV_LOG_ERROR, 63 "Insufficient extradata - need at least %d bytes, got %d\n", 64 8 + rpr * 2, avctx->extradata_size); 65 return AVERROR(EINVAL); 66 } 67 68 w = r->s.avctx->extradata[6 + rpr*2] << 2; 69 h = r->s.avctx->extradata[7 + rpr*2] << 2; 70 } 71 si->width = w; 72 si->height = h; 73 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4); 74 mb_bits = ff_rv34_get_start_offset(gb, mb_size); 75 si->start = get_bits(gb, mb_bits); 76 skip_bits1(gb); 77 return 0; 78} 79 80/** 81 * Decode 4x4 intra types array. 82 */ 83static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst) 84{ 85 int i, j, k; 86 87 for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){ 88 for(j = 0; j < 4; j+= 2){ 89 unsigned code = svq3_get_ue_golomb(gb) << 1; 90 if (code > 80U*2U) { 91 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n"); 92 return -1; 93 } 94 for(k = 0; k < 2; k++){ 95 int A = dst[-r->intra_types_stride] + 1; 96 int B = dst[-1] + 1; 97 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]]; 98 if(dst[-1] == 9){ 99 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n"); 100 return -1; 101 } 102 } 103 } 104 } 105 return 0; 106} 107 108/** 109 * Decode macroblock information. 110 */ 111static int rv30_decode_mb_info(RV34DecContext *r) 112{ 113 static const int rv30_p_types[6] = { RV34_MB_SKIP, RV34_MB_P_16x16, RV34_MB_P_8x8, -1, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 }; 114 static const int rv30_b_types[6] = { RV34_MB_SKIP, RV34_MB_B_DIRECT, RV34_MB_B_FORWARD, RV34_MB_B_BACKWARD, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 }; 115 MpegEncContext *s = &r->s; 116 GetBitContext *gb = &s->gb; 117 unsigned code = svq3_get_ue_golomb(gb); 118 119 if (code > 11) { 120 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n"); 121 return -1; 122 } 123 if(code > 5){ 124 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n"); 125 code -= 6; 126 } 127 if(s->pict_type != AV_PICTURE_TYPE_B) 128 return rv30_p_types[code]; 129 else 130 return rv30_b_types[code]; 131} 132 133static inline void rv30_weak_loop_filter(uint8_t *src, const int step, 134 const int stride, const int lim) 135{ 136 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; 137 int i, diff; 138 139 for(i = 0; i < 4; i++){ 140 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3; 141 diff = av_clip(diff, -lim, lim); 142 src[-1*step] = cm[src[-1*step] + diff]; 143 src[ 0*step] = cm[src[ 0*step] - diff]; 144 src += stride; 145 } 146} 147 148static void rv30_loop_filter(RV34DecContext *r, int row) 149{ 150 MpegEncContext *s = &r->s; 151 int mb_pos, mb_x; 152 int i, j, k; 153 uint8_t *Y, *C; 154 int loc_lim, cur_lim, left_lim = 0, top_lim = 0; 155 156 mb_pos = row * s->mb_stride; 157 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ 158 int mbtype = s->current_picture_ptr->mb_type[mb_pos]; 159 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype)) 160 r->deblock_coefs[mb_pos] = 0xFFFF; 161 if(IS_INTRA(mbtype)) 162 r->cbp_chroma[mb_pos] = 0xFF; 163 } 164 165 /* all vertical edges are filtered first 166 * and horizontal edges are filtered on the next iteration 167 */ 168 mb_pos = row * s->mb_stride; 169 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ 170 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; 171 if(mb_x) 172 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]]; 173 for(j = 0; j < 16; j += 4){ 174 Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x; 175 for(i = !mb_x; i < 4; i++, Y += 4){ 176 int ij = i + j; 177 loc_lim = 0; 178 if(r->deblock_coefs[mb_pos] & (1 << ij)) 179 loc_lim = cur_lim; 180 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3))) 181 loc_lim = left_lim; 182 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1))) 183 loc_lim = cur_lim; 184 if(loc_lim) 185 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim); 186 } 187 } 188 for(k = 0; k < 2; k++){ 189 int cur_cbp, left_cbp = 0; 190 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; 191 if(mb_x) 192 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF; 193 for(j = 0; j < 8; j += 4){ 194 C = s->current_picture_ptr->f->data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x; 195 for(i = !mb_x; i < 2; i++, C += 4){ 196 int ij = i + (j >> 1); 197 loc_lim = 0; 198 if (cur_cbp & (1 << ij)) 199 loc_lim = cur_lim; 200 else if(!i && left_cbp & (1 << (ij + 1))) 201 loc_lim = left_lim; 202 else if( i && cur_cbp & (1 << (ij - 1))) 203 loc_lim = cur_lim; 204 if(loc_lim) 205 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim); 206 } 207 } 208 } 209 } 210 mb_pos = row * s->mb_stride; 211 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ 212 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; 213 if(row) 214 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]]; 215 for(j = 4*!row; j < 16; j += 4){ 216 Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize; 217 for(i = 0; i < 4; i++, Y += 4){ 218 int ij = i + j; 219 loc_lim = 0; 220 if(r->deblock_coefs[mb_pos] & (1 << ij)) 221 loc_lim = cur_lim; 222 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12))) 223 loc_lim = top_lim; 224 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4))) 225 loc_lim = cur_lim; 226 if(loc_lim) 227 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim); 228 } 229 } 230 for(k = 0; k < 2; k++){ 231 int cur_cbp, top_cbp = 0; 232 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; 233 if(row) 234 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF; 235 for(j = 4*!row; j < 8; j += 4){ 236 C = s->current_picture_ptr->f->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize; 237 for(i = 0; i < 2; i++, C += 4){ 238 int ij = i + (j >> 1); 239 loc_lim = 0; 240 if (r->cbp_chroma[mb_pos] & (1 << ij)) 241 loc_lim = cur_lim; 242 else if(!j && top_cbp & (1 << (ij + 2))) 243 loc_lim = top_lim; 244 else if( j && cur_cbp & (1 << (ij - 2))) 245 loc_lim = cur_lim; 246 if(loc_lim) 247 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim); 248 } 249 } 250 } 251 } 252} 253 254/** 255 * Initialize decoder. 256 */ 257static av_cold int rv30_decode_init(AVCodecContext *avctx) 258{ 259 RV34DecContext *r = avctx->priv_data; 260 int ret; 261 262 r->rv30 = 1; 263 if ((ret = ff_rv34_decode_init(avctx)) < 0) 264 return ret; 265 if(avctx->extradata_size < 2){ 266 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n"); 267 return -1; 268 } 269 270 r->max_rpr = avctx->extradata[1] & 7; 271 if(avctx->extradata_size < 2*r->max_rpr + 8){ 272 av_log(avctx, AV_LOG_WARNING, "Insufficient extradata - need at least %d bytes, got %d\n", 273 2*r->max_rpr + 8, avctx->extradata_size); 274 } 275 276 r->parse_slice_header = rv30_parse_slice_header; 277 r->decode_intra_types = rv30_decode_intra_types; 278 r->decode_mb_info = rv30_decode_mb_info; 279 r->loop_filter = rv30_loop_filter; 280 r->luma_dc_quant_i = rv30_luma_dc_quant; 281 r->luma_dc_quant_p = rv30_luma_dc_quant; 282 return 0; 283} 284 285AVCodec ff_rv30_decoder = { 286 .name = "rv30", 287 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"), 288 .type = AVMEDIA_TYPE_VIDEO, 289 .id = AV_CODEC_ID_RV30, 290 .priv_data_size = sizeof(RV34DecContext), 291 .init = rv30_decode_init, 292 .close = ff_rv34_decode_end, 293 .decode = ff_rv34_decode_frame, 294 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY | 295 CODEC_CAP_FRAME_THREADS, 296 .flush = ff_mpeg_flush, 297 .pix_fmts = (const enum AVPixelFormat[]) { 298 AV_PIX_FMT_YUV420P, 299 AV_PIX_FMT_NONE 300 }, 301 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy), 302 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context), 303}; 304