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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * RV30 decoder |
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| 3 | * Copyright (c) 2007 Konstantin Shishkov |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * RV30 decoder |
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| 25 | */ |
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| 26 | |||
| 27 | #include "avcodec.h" |
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| 28 | #include "mpegvideo.h" |
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| 29 | #include "golomb.h" |
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| 30 | |||
| 31 | #include "rv34.h" |
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| 32 | #include "rv30data.h" |
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| 33 | |||
| 34 | |||
| 35 | static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si) |
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| 36 | { |
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| 37 | int mb_bits; |
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| 38 | int w = r->s.width, h = r->s.height; |
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| 39 | int mb_size; |
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| 40 | int rpr; |
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| 41 | |||
| 42 | memset(si, 0, sizeof(SliceInfo)); |
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| 43 | if(get_bits(gb, 3)) |
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| 44 | return -1; |
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| 45 | si->type = get_bits(gb, 2); |
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| 46 | if(si->type == 1) si->type = 0; |
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| 47 | if(get_bits1(gb)) |
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| 48 | return -1; |
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| 49 | si->quant = get_bits(gb, 5); |
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| 50 | skip_bits1(gb); |
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| 51 | si->pts = get_bits(gb, 13); |
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| 52 | rpr = get_bits(gb, r->rpr); |
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| 53 | if (r->s.avctx->extradata_size < 8 + rpr*2) { |
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| 54 | av_log(r->s.avctx, AV_LOG_WARNING, |
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| 55 | "Extradata does not contain selected resolution\n"); |
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| 56 | rpr = 0; |
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| 57 | } |
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| 58 | if(rpr){ |
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| 59 | w = r->s.avctx->extradata[6 + rpr*2] << 2; |
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| 60 | h = r->s.avctx->extradata[7 + rpr*2] << 2; |
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| 61 | } |
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| 62 | si->width = w; |
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| 63 | si->height = h; |
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| 64 | mb_size = ((w + 15) >> 4) * ((h + 15) >> 4); |
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| 65 | mb_bits = ff_rv34_get_start_offset(gb, mb_size); |
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| 66 | si->start = get_bits(gb, mb_bits); |
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| 67 | skip_bits1(gb); |
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| 68 | return 0; |
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| 69 | } |
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| 70 | |||
| 71 | /** |
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| 72 | * Decode 4x4 intra types array. |
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| 73 | */ |
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| 74 | static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst) |
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| 75 | { |
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| 76 | int i, j, k; |
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| 77 | |||
| 78 | for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){ |
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| 79 | for(j = 0; j < 4; j+= 2){ |
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| 80 | unsigned code = svq3_get_ue_golomb(gb) << 1; |
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| 81 | if (code > 80U*2U) { |
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| 82 | av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n"); |
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| 83 | return -1; |
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| 84 | } |
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| 85 | for(k = 0; k < 2; k++){ |
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| 86 | int A = dst[-r->intra_types_stride] + 1; |
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| 87 | int B = dst[-1] + 1; |
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| 88 | *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]]; |
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| 89 | if(dst[-1] == 9){ |
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| 90 | av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n"); |
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| 91 | return -1; |
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| 92 | } |
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| 93 | } |
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| 94 | } |
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| 95 | } |
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| 96 | return 0; |
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| 97 | } |
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| 98 | |||
| 99 | /** |
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| 100 | * Decode macroblock information. |
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| 101 | */ |
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| 102 | static int rv30_decode_mb_info(RV34DecContext *r) |
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| 103 | { |
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| 104 | 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 }; |
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| 105 | 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 }; |
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| 106 | MpegEncContext *s = &r->s; |
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| 107 | GetBitContext *gb = &s->gb; |
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| 108 | unsigned code = svq3_get_ue_golomb(gb); |
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| 109 | |||
| 110 | if (code > 11) { |
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| 111 | av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n"); |
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| 112 | return -1; |
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| 113 | } |
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| 114 | if(code > 5){ |
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| 115 | av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n"); |
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| 116 | code -= 6; |
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| 117 | } |
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| 118 | if(s->pict_type != AV_PICTURE_TYPE_B) |
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| 119 | return rv30_p_types[code]; |
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| 120 | else |
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| 121 | return rv30_b_types[code]; |
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| 122 | } |
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| 123 | |||
| 124 | static inline void rv30_weak_loop_filter(uint8_t *src, const int step, |
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| 125 | const int stride, const int lim) |
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| 126 | { |
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| 127 | const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; |
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| 128 | int i, diff; |
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| 129 | |||
| 130 | for(i = 0; i < 4; i++){ |
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| 131 | diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3; |
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| 132 | diff = av_clip(diff, -lim, lim); |
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| 133 | src[-1*step] = cm[src[-1*step] + diff]; |
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| 134 | src[ 0*step] = cm[src[ 0*step] - diff]; |
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| 135 | src += stride; |
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| 136 | } |
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| 137 | } |
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| 138 | |||
| 139 | static void rv30_loop_filter(RV34DecContext *r, int row) |
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| 140 | { |
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| 141 | MpegEncContext *s = &r->s; |
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| 142 | int mb_pos, mb_x; |
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| 143 | int i, j, k; |
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| 144 | uint8_t *Y, *C; |
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| 145 | int loc_lim, cur_lim, left_lim = 0, top_lim = 0; |
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| 146 | |||
| 147 | mb_pos = row * s->mb_stride; |
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| 148 | for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ |
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| 149 | int mbtype = s->current_picture_ptr->mb_type[mb_pos]; |
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| 150 | if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype)) |
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| 151 | r->deblock_coefs[mb_pos] = 0xFFFF; |
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| 152 | if(IS_INTRA(mbtype)) |
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| 153 | r->cbp_chroma[mb_pos] = 0xFF; |
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| 154 | } |
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| 155 | |||
| 156 | /* all vertical edges are filtered first |
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| 157 | * and horizontal edges are filtered on the next iteration |
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| 158 | */ |
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| 159 | mb_pos = row * s->mb_stride; |
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| 160 | for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ |
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| 161 | cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; |
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| 162 | if(mb_x) |
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| 163 | left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]]; |
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| 164 | for(j = 0; j < 16; j += 4){ |
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| 165 | Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x; |
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| 166 | for(i = !mb_x; i < 4; i++, Y += 4){ |
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| 167 | int ij = i + j; |
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| 168 | loc_lim = 0; |
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| 169 | if(r->deblock_coefs[mb_pos] & (1 << ij)) |
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| 170 | loc_lim = cur_lim; |
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| 171 | else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3))) |
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| 172 | loc_lim = left_lim; |
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| 173 | else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1))) |
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| 174 | loc_lim = cur_lim; |
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| 175 | if(loc_lim) |
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| 176 | rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim); |
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| 177 | } |
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| 178 | } |
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| 179 | for(k = 0; k < 2; k++){ |
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| 180 | int cur_cbp, left_cbp = 0; |
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| 181 | cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; |
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| 182 | if(mb_x) |
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| 183 | left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF; |
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| 184 | for(j = 0; j < 8; j += 4){ |
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| 185 | C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x; |
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| 186 | for(i = !mb_x; i < 2; i++, C += 4){ |
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| 187 | int ij = i + (j >> 1); |
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| 188 | loc_lim = 0; |
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| 189 | if (cur_cbp & (1 << ij)) |
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| 190 | loc_lim = cur_lim; |
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| 191 | else if(!i && left_cbp & (1 << (ij + 1))) |
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| 192 | loc_lim = left_lim; |
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| 193 | else if( i && cur_cbp & (1 << (ij - 1))) |
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| 194 | loc_lim = cur_lim; |
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| 195 | if(loc_lim) |
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| 196 | rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim); |
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| 197 | } |
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| 198 | } |
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| 199 | } |
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| 200 | } |
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| 201 | mb_pos = row * s->mb_stride; |
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| 202 | for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ |
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| 203 | cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; |
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| 204 | if(row) |
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| 205 | top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]]; |
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| 206 | for(j = 4*!row; j < 16; j += 4){ |
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| 207 | Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize; |
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| 208 | for(i = 0; i < 4; i++, Y += 4){ |
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| 209 | int ij = i + j; |
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| 210 | loc_lim = 0; |
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| 211 | if(r->deblock_coefs[mb_pos] & (1 << ij)) |
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| 212 | loc_lim = cur_lim; |
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| 213 | else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12))) |
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| 214 | loc_lim = top_lim; |
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| 215 | else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4))) |
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| 216 | loc_lim = cur_lim; |
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| 217 | if(loc_lim) |
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| 218 | rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim); |
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| 219 | } |
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| 220 | } |
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| 221 | for(k = 0; k < 2; k++){ |
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| 222 | int cur_cbp, top_cbp = 0; |
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| 223 | cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; |
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| 224 | if(row) |
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| 225 | top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF; |
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| 226 | for(j = 4*!row; j < 8; j += 4){ |
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| 227 | C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize; |
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| 228 | for(i = 0; i < 2; i++, C += 4){ |
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| 229 | int ij = i + (j >> 1); |
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| 230 | loc_lim = 0; |
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| 231 | if (r->cbp_chroma[mb_pos] & (1 << ij)) |
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| 232 | loc_lim = cur_lim; |
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| 233 | else if(!j && top_cbp & (1 << (ij + 2))) |
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| 234 | loc_lim = top_lim; |
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| 235 | else if( j && cur_cbp & (1 << (ij - 2))) |
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| 236 | loc_lim = cur_lim; |
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| 237 | if(loc_lim) |
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| 238 | rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim); |
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| 239 | } |
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| 240 | } |
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| 241 | } |
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| 242 | } |
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| 243 | } |
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| 244 | |||
| 245 | /** |
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| 246 | * Initialize decoder. |
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| 247 | */ |
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| 248 | static av_cold int rv30_decode_init(AVCodecContext *avctx) |
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| 249 | { |
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| 250 | RV34DecContext *r = avctx->priv_data; |
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| 251 | int ret; |
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| 252 | |||
| 253 | r->rv30 = 1; |
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| 254 | if ((ret = ff_rv34_decode_init(avctx)) < 0) |
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| 255 | return ret; |
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| 256 | if(avctx->extradata_size < 2){ |
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| 257 | av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n"); |
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| 258 | return -1; |
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| 259 | } |
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| 260 | r->rpr = (avctx->extradata[1] & 7) >> 1; |
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| 261 | r->rpr = FFMIN(r->rpr + 1, 3); |
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| 262 | if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){ |
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| 263 | av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n", |
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| 264 | 6 + r->rpr * 2, avctx->extradata_size); |
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| 265 | } |
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| 266 | r->parse_slice_header = rv30_parse_slice_header; |
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| 267 | r->decode_intra_types = rv30_decode_intra_types; |
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| 268 | r->decode_mb_info = rv30_decode_mb_info; |
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| 269 | r->loop_filter = rv30_loop_filter; |
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| 270 | r->luma_dc_quant_i = rv30_luma_dc_quant; |
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| 271 | r->luma_dc_quant_p = rv30_luma_dc_quant; |
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| 272 | return 0; |
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| 273 | } |
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| 274 | |||
| 275 | AVCodec ff_rv30_decoder = { |
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| 276 | .name = "rv30", |
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| 277 | .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"), |
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| 278 | .type = AVMEDIA_TYPE_VIDEO, |
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| 279 | .id = AV_CODEC_ID_RV30, |
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| 280 | .priv_data_size = sizeof(RV34DecContext), |
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| 281 | .init = rv30_decode_init, |
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| 282 | .close = ff_rv34_decode_end, |
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| 283 | .decode = ff_rv34_decode_frame, |
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| 284 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY | |
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| 285 | CODEC_CAP_FRAME_THREADS, |
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| 286 | .flush = ff_mpeg_flush, |
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| 287 | .pix_fmts = ff_pixfmt_list_420, |
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| 288 | .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy), |
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| 289 | .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context), |
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| 290 | }; |