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 "codec_internal.h" 29#include "mpegutils.h" 30#include "mpegvideo.h" 31#include "mpegvideodec.h" 32#include "golomb.h" 33 34#include "rv34.h" 35#include "rv30data.h" 36 37 38static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si) 39{ 40 AVCodecContext *avctx = r->s.avctx; 41 int mb_bits; 42 int w = r->s.width, h = r->s.height; 43 int mb_size; 44 int rpr; 45 46 memset(si, 0, sizeof(SliceInfo)); 47 if(get_bits(gb, 3)) 48 return -1; 49 si->type = get_bits(gb, 2); 50 if(si->type == 1) si->type = 0; 51 if(get_bits1(gb)) 52 return -1; 53 si->quant = get_bits(gb, 5); 54 skip_bits1(gb); 55 si->pts = get_bits(gb, 13); 56 rpr = get_bits(gb, av_log2(r->max_rpr) + 1); 57 if(rpr){ 58 if (rpr > r->max_rpr) { 59 av_log(avctx, AV_LOG_ERROR, "rpr too large\n"); 60 return AVERROR_INVALIDDATA; 61 } 62 63 if (avctx->extradata_size < rpr * 2 + 8) { 64 av_log(avctx, AV_LOG_ERROR, 65 "Insufficient extradata - need at least %d bytes, got %d\n", 66 8 + rpr * 2, avctx->extradata_size); 67 return AVERROR(EINVAL); 68 } 69 70 w = r->s.avctx->extradata[6 + rpr*2] << 2; 71 h = r->s.avctx->extradata[7 + rpr*2] << 2; 72 } else { 73 w = r->orig_width; 74 h = r->orig_height; 75 } 76 si->width = w; 77 si->height = h; 78 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4); 79 mb_bits = ff_rv34_get_start_offset(gb, mb_size); 80 si->start = get_bits(gb, mb_bits); 81 skip_bits1(gb); 82 return 0; 83} 84 85/** 86 * Decode 4x4 intra types array. 87 */ 88static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst) 89{ 90 int i, j, k; 91 92 for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){ 93 for(j = 0; j < 4; j+= 2){ 94 unsigned code = get_interleaved_ue_golomb(gb) << 1; 95 if (code > 80U*2U) { 96 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n"); 97 return -1; 98 } 99 for(k = 0; k < 2; k++){ 100 int A = dst[-r->intra_types_stride] + 1; 101 int B = dst[-1] + 1; 102 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]]; 103 if(dst[-1] == 9){ 104 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n"); 105 return -1; 106 } 107 } 108 } 109 } 110 return 0; 111} 112 113/** 114 * Decode macroblock information. 115 */ 116static int rv30_decode_mb_info(RV34DecContext *r) 117{ 118 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 }; 119 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 }; 120 MpegEncContext *s = &r->s; 121 GetBitContext *gb = &s->gb; 122 unsigned code = get_interleaved_ue_golomb(gb); 123 124 if (code > 11) { 125 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n"); 126 return -1; 127 } 128 if(code > 5){ 129 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n"); 130 code -= 6; 131 } 132 if(s->pict_type != AV_PICTURE_TYPE_B) 133 return rv30_p_types[code]; 134 else 135 return rv30_b_types[code]; 136} 137 138static inline void rv30_weak_loop_filter(uint8_t *src, const int step, 139 const int stride, const int lim) 140{ 141 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; 142 int i, diff; 143 144 for(i = 0; i < 4; i++){ 145 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3; 146 diff = av_clip(diff, -lim, lim); 147 src[-1*step] = cm[src[-1*step] + diff]; 148 src[ 0*step] = cm[src[ 0*step] - diff]; 149 src += stride; 150 } 151} 152 153static void rv30_loop_filter(RV34DecContext *r, int row) 154{ 155 MpegEncContext *s = &r->s; 156 int mb_pos, mb_x; 157 int i, j, k; 158 uint8_t *Y, *C; 159 int loc_lim, cur_lim, left_lim = 0, top_lim = 0; 160 161 mb_pos = row * s->mb_stride; 162 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ 163 int mbtype = s->current_picture_ptr->mb_type[mb_pos]; 164 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype)) 165 r->deblock_coefs[mb_pos] = 0xFFFF; 166 if(IS_INTRA(mbtype)) 167 r->cbp_chroma[mb_pos] = 0xFF; 168 } 169 170 /* all vertical edges are filtered first 171 * and horizontal edges are filtered on the next iteration 172 */ 173 mb_pos = row * s->mb_stride; 174 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ 175 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; 176 if(mb_x) 177 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]]; 178 for(j = 0; j < 16; j += 4){ 179 Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x; 180 for(i = !mb_x; i < 4; i++, Y += 4){ 181 int ij = i + j; 182 loc_lim = 0; 183 if(r->deblock_coefs[mb_pos] & (1 << ij)) 184 loc_lim = cur_lim; 185 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3))) 186 loc_lim = left_lim; 187 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1))) 188 loc_lim = cur_lim; 189 if(loc_lim) 190 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim); 191 } 192 } 193 for(k = 0; k < 2; k++){ 194 int cur_cbp, left_cbp = 0; 195 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; 196 if(mb_x) 197 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF; 198 for(j = 0; j < 8; j += 4){ 199 C = s->current_picture_ptr->f->data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x; 200 for(i = !mb_x; i < 2; i++, C += 4){ 201 int ij = i + (j >> 1); 202 loc_lim = 0; 203 if (cur_cbp & (1 << ij)) 204 loc_lim = cur_lim; 205 else if(!i && left_cbp & (1 << (ij + 1))) 206 loc_lim = left_lim; 207 else if( i && cur_cbp & (1 << (ij - 1))) 208 loc_lim = cur_lim; 209 if(loc_lim) 210 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim); 211 } 212 } 213 } 214 } 215 mb_pos = row * s->mb_stride; 216 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ 217 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; 218 if(row) 219 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]]; 220 for(j = 4*!row; j < 16; j += 4){ 221 Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize; 222 for(i = 0; i < 4; i++, Y += 4){ 223 int ij = i + j; 224 loc_lim = 0; 225 if(r->deblock_coefs[mb_pos] & (1 << ij)) 226 loc_lim = cur_lim; 227 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12))) 228 loc_lim = top_lim; 229 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4))) 230 loc_lim = cur_lim; 231 if(loc_lim) 232 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim); 233 } 234 } 235 for(k = 0; k < 2; k++){ 236 int cur_cbp, top_cbp = 0; 237 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; 238 if(row) 239 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF; 240 for(j = 4*!row; j < 8; j += 4){ 241 C = s->current_picture_ptr->f->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize; 242 for(i = 0; i < 2; i++, C += 4){ 243 int ij = i + (j >> 1); 244 loc_lim = 0; 245 if (r->cbp_chroma[mb_pos] & (1 << ij)) 246 loc_lim = cur_lim; 247 else if(!j && top_cbp & (1 << (ij + 2))) 248 loc_lim = top_lim; 249 else if( j && cur_cbp & (1 << (ij - 2))) 250 loc_lim = cur_lim; 251 if(loc_lim) 252 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim); 253 } 254 } 255 } 256 } 257} 258 259/** 260 * Initialize decoder. 261 */ 262static av_cold int rv30_decode_init(AVCodecContext *avctx) 263{ 264 RV34DecContext *r = avctx->priv_data; 265 int ret; 266 267 r->orig_width = avctx->coded_width; 268 r->orig_height = avctx->coded_height; 269 270 if (avctx->extradata_size < 2) { 271 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n"); 272 return AVERROR(EINVAL); 273 } 274 r->rv30 = 1; 275 if ((ret = ff_rv34_decode_init(avctx)) < 0) 276 return ret; 277 278 r->max_rpr = avctx->extradata[1] & 7; 279 if(avctx->extradata_size < 2*r->max_rpr + 8){ 280 av_log(avctx, AV_LOG_WARNING, "Insufficient extradata - need at least %d bytes, got %d\n", 281 2*r->max_rpr + 8, avctx->extradata_size); 282 } 283 284 r->parse_slice_header = rv30_parse_slice_header; 285 r->decode_intra_types = rv30_decode_intra_types; 286 r->decode_mb_info = rv30_decode_mb_info; 287 r->loop_filter = rv30_loop_filter; 288 r->luma_dc_quant_i = rv30_luma_dc_quant; 289 r->luma_dc_quant_p = rv30_luma_dc_quant; 290 ff_rv30dsp_init(&r->rdsp); 291 return 0; 292} 293 294const FFCodec ff_rv30_decoder = { 295 .p.name = "rv30", 296 .p.long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"), 297 .p.type = AVMEDIA_TYPE_VIDEO, 298 .p.id = AV_CODEC_ID_RV30, 299 .priv_data_size = sizeof(RV34DecContext), 300 .init = rv30_decode_init, 301 .close = ff_rv34_decode_end, 302 FF_CODEC_DECODE_CB(ff_rv34_decode_frame), 303 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | 304 AV_CODEC_CAP_FRAME_THREADS, 305 .flush = ff_mpeg_flush, 306 .p.pix_fmts = (const enum AVPixelFormat[]) { 307 AV_PIX_FMT_YUV420P, 308 AV_PIX_FMT_NONE 309 }, 310 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context), 311 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | 312 FF_CODEC_CAP_ALLOCATE_PROGRESS, 313}; 314