libavcodec/rv30.c

   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 libavcodec/rv30.c
  24  * RV30 decoder
  25  */
  26
  27 #include "avcodec.h"
  28 #include "dsputil.h"
  29 #include "mpegvideo.h"
  30 #include "golomb.h"
  31
  32 #include "rv34.h"
  33 #include "rv30data.h"
  34
  35
  36 static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
  37 {
  38     int mb_bits;
  39     int w = r->s.width, h = r->s.height;
  40     int mb_size;
  41     int rpr;
  42
  43     memset(si, 0, sizeof(SliceInfo));
  44     if(get_bits(gb, 3))
  45         return -1;
  46     si->type = get_bits(gb, 2);
  47     if(si->type == 1) si->type = 0;
  48     if(get_bits1(gb))
  49         return -1;
  50     si->quant = get_bits(gb, 5);
  51     skip_bits1(gb);
  52     si->pts = get_bits(gb, 13);
  53     rpr = get_bits(gb, r->rpr);
  54     if(rpr){
  55         w = r->s.avctx->extradata[6 + rpr*2] << 2;
  56         h = r->s.avctx->extradata[7 + rpr*2] << 2;
  57     }
  58     si->width  = w;
  59     si->height = h;
  60     mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
  61     mb_bits = ff_rv34_get_start_offset(gb, mb_size);
  62     si->start = get_bits(gb, mb_bits);
  63     skip_bits1(gb);
  64     return 0;
  65 }
  66
  67 /**
  68  * Decode 4x4 intra types array.
  69  */
  70 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
  71 {
  72     int i, j, k;
  73
  74     for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
  75         for(j = 0; j < 4; j+= 2){
  76             int code = svq3_get_ue_golomb(gb) << 1;
  77             if(code >= 81*2){
  78                 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
  79                 return -1;
  80             }
  81             for(k = 0; k < 2; k++){
  82                 int A = dst[-r->intra_types_stride] + 1;
  83                 int B = dst[-1] + 1;
  84                 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
  85                 if(dst[-1] == 9){
  86                     av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
  87                     return -1;
  88                 }
  89             }
  90         }
  91     }
  92     return 0;
  93 }
  94
  95 /**
  96  * Decode macroblock information.
  97  */
  98 static int rv30_decode_mb_info(RV34DecContext *r)
  99 {
 100     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 };
 101     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 };
 102     MpegEncContext *s = &r->s;
 103     GetBitContext *gb = &s->gb;
 104     int code = svq3_get_ue_golomb(gb);
 105
 106     if(code > 11){
 107         av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
 108         return -1;
 109     }
 110     if(code > 5){
 111         av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
 112         code -= 6;
 113     }
 114     if(s->pict_type != FF_B_TYPE)
 115         return rv30_p_types[code];
 116     else
 117         return rv30_b_types[code];
 118 }
 119
 120 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
 121                                          const int stride, const int lim)
 122 {
 123     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
 124     int i, diff;
 125
 126     for(i = 0; i < 4; i++){
 127         diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
 128         diff = av_clip(diff, -lim, lim);
 129         src[-1*step] = cm[src[-1*step] + diff];
 130         src[ 0*step] = cm[src[ 0*step] - diff];
 131         src += stride;
 132     }
 133 }
 134
 135 static void rv30_loop_filter(RV34DecContext *r, int row)
 136 {
 137     MpegEncContext *s = &r->s;
 138     int mb_pos, mb_x;
 139     int i, j, k;
 140     uint8_t *Y, *C;
 141     int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
 142
 143     mb_pos = row * s->mb_stride;
 144     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
 145         int mbtype = s->current_picture_ptr->mb_type[mb_pos];
 146         if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
 147             r->deblock_coefs[mb_pos] = 0xFFFF;
 148         if(IS_INTRA(mbtype))
 149             r->cbp_chroma[mb_pos] = 0xFF;
 150     }
 151
 152     /* all vertical edges are filtered first
 153      * and horizontal edges are filtered on the next iteration
 154      */
 155     mb_pos = row * s->mb_stride;
 156     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
 157         cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
 158         if(mb_x)
 159             left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
 160         for(j = 0; j < 16; j += 4){
 161             Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
 162             for(i = !mb_x; i < 4; i++, Y += 4){
 163                 int ij = i + j;
 164                 loc_lim = 0;
 165                 if(r->deblock_coefs[mb_pos] & (1 << ij))
 166                     loc_lim = cur_lim;
 167                 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
 168                     loc_lim = left_lim;
 169                 else if( i && r->deblock_coefs[mb_pos]     & (1 << (ij - 1)))
 170                     loc_lim = cur_lim;
 171                 if(loc_lim)
 172                     rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
 173             }
 174         }
 175         for(k = 0; k < 2; k++){
 176             int cur_cbp, left_cbp = 0;
 177             cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
 178             if(mb_x)
 179                 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
 180             for(j = 0; j < 8; j += 4){
 181                 C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
 182                 for(i = !mb_x; i < 2; i++, C += 4){
 183                     int ij = i + (j >> 1);
 184                     loc_lim = 0;
 185                     if(cur_cbp && (1 << ij))
 186                         loc_lim = cur_lim;
 187                     else if(!i && left_cbp & (1 << (ij + 1)))
 188                         loc_lim = left_lim;
 189                     else if( i && cur_cbp  & (1 << (ij - 1)))
 190                         loc_lim = cur_lim;
 191                     if(loc_lim)
 192                         rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
 193                 }
 194             }
 195         }
 196     }
 197     mb_pos = row * s->mb_stride;
 198     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
 199         cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
 200         if(row)
 201             top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
 202         for(j = 4*!row; j < 16; j += 4){
 203             Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
 204             for(i = 0; i < 4; i++, Y += 4){
 205                 int ij = i + j;
 206                 loc_lim = 0;
 207                 if(r->deblock_coefs[mb_pos] & (1 << ij))
 208                     loc_lim = cur_lim;
 209                 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
 210                     loc_lim = top_lim;
 211                 else if( j && r->deblock_coefs[mb_pos]                & (1 << (ij - 4)))
 212                     loc_lim = cur_lim;
 213                 if(loc_lim)
 214                     rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
 215             }
 216         }
 217         for(k = 0; k < 2; k++){
 218             int cur_cbp, top_cbp = 0;
 219             cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
 220             if(row)
 221                 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
 222             for(j = 4*!row; j < 8; j += 4){
 223                 C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
 224                 for(i = 0; i < 2; i++, C += 4){
 225                     int ij = i + (j >> 1);
 226                     loc_lim = 0;
 227                     if(r->cbp_chroma[mb_pos] && (1 << ij))
 228                         loc_lim = cur_lim;
 229                     else if(!j && top_cbp & (1 << (ij + 2)))
 230                         loc_lim = top_lim;
 231                     else if( j && cur_cbp & (1 << (ij - 2)))
 232                         loc_lim = cur_lim;
 233                     if(loc_lim)
 234                         rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
 235                 }
 236             }
 237         }
 238     }
 239 }
 240
 241 /**
 242  * Initialize decoder.
 243  */
 244 static av_cold int rv30_decode_init(AVCodecContext *avctx)
 245 {
 246     RV34DecContext *r = avctx->priv_data;
 247
 248     r->rv30 = 1;
 249     ff_rv34_decode_init(avctx);
 250     if(avctx->extradata_size < 2){
 251         av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
 252         return -1;
 253     }
 254     r->rpr = (avctx->extradata[1] & 7) >> 1;
 255     r->rpr = FFMIN(r->rpr + 1, 3);
 256     if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){
 257         av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",
 258                6 + r->rpr * 2, avctx->extradata_size);
 259     }
 260     r->parse_slice_header = rv30_parse_slice_header;
 261     r->decode_intra_types = rv30_decode_intra_types;
 262     r->decode_mb_info     = rv30_decode_mb_info;
 263     r->loop_filter        = rv30_loop_filter;
 264     r->luma_dc_quant_i = rv30_luma_dc_quant;
 265     r->luma_dc_quant_p = rv30_luma_dc_quant;
 266     return 0;
 267 }
 268
 269 AVCodec rv30_decoder = {
 270     "rv30",
 271     CODEC_TYPE_VIDEO,
 272     CODEC_ID_RV30,
 273     sizeof(RV34DecContext),
 274     rv30_decode_init,
 275     NULL,
 276     ff_rv34_decode_end,
 277     ff_rv34_decode_frame,
 278     CODEC_CAP_DR1 | CODEC_CAP_DELAY,
 279     .flush = ff_mpeg_flush,
 280     .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
 281     .pix_fmts= ff_pixfmt_list_420,
 282 };