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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * ITU H263 bitstream decoder |
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| 3 | * Copyright (c) 2000,2001 Fabrice Bellard |
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| 4 | * H263+ support. |
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| 5 | * Copyright (c) 2001 Juan J. Sierralta P |
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| 6 | * Copyright (c) 2002-2004 Michael Niedermayer |
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| 7 | * |
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| 8 | * This file is part of FFmpeg. |
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| 9 | * |
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| 10 | * FFmpeg is free software; you can redistribute it and/or |
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| 11 | * modify it under the terms of the GNU Lesser General Public |
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| 12 | * License as published by the Free Software Foundation; either |
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| 13 | * version 2.1 of the License, or (at your option) any later version. |
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| 14 | * |
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| 15 | * FFmpeg is distributed in the hope that it will be useful, |
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | * Lesser General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU Lesser General Public |
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| 21 | * License along with FFmpeg; if not, write to the Free Software |
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| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 23 | */ |
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| 24 | |||
| 25 | /** |
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| 26 | * @file |
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| 27 | * h263 decoder. |
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| 28 | */ |
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| 29 | |||
| 30 | #define UNCHECKED_BITSTREAM_READER 1 |
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| 31 | #include |
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| 32 | |||
| 33 | #include "libavutil/attributes.h" |
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| 34 | #include "libavutil/internal.h" |
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| 35 | #include "libavutil/mathematics.h" |
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| 36 | #include "avcodec.h" |
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| 37 | #include "mpegvideo.h" |
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| 38 | #include "h263.h" |
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| 39 | #include "mathops.h" |
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| 40 | #include "unary.h" |
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| 41 | #include "flv.h" |
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| 42 | #include "mpeg4video.h" |
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| 43 | |||
| 44 | // The defines below define the number of bits that are read at once for |
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| 45 | // reading vlc values. Changing these may improve speed and data cache needs |
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| 46 | // be aware though that decreasing them may need the number of stages that is |
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| 47 | // passed to get_vlc* to be increased. |
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| 48 | #define MV_VLC_BITS 9 |
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| 49 | #define H263_MBTYPE_B_VLC_BITS 6 |
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| 50 | #define CBPC_B_VLC_BITS 3 |
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| 51 | |||
| 52 | static const int h263_mb_type_b_map[15]= { |
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| 53 | MB_TYPE_DIRECT2 | MB_TYPE_L0L1, |
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| 54 | MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP, |
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| 55 | MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT, |
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| 56 | MB_TYPE_L0 | MB_TYPE_16x16, |
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| 57 | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_16x16, |
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| 58 | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16, |
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| 59 | MB_TYPE_L1 | MB_TYPE_16x16, |
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| 60 | MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_16x16, |
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| 61 | MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16, |
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| 62 | MB_TYPE_L0L1 | MB_TYPE_16x16, |
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| 63 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_16x16, |
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| 64 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16, |
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| 65 | 0, //stuffing |
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| 66 | MB_TYPE_INTRA4x4 | MB_TYPE_CBP, |
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| 67 | MB_TYPE_INTRA4x4 | MB_TYPE_CBP | MB_TYPE_QUANT, |
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| 68 | }; |
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| 69 | |||
| 70 | void ff_h263_show_pict_info(MpegEncContext *s){ |
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| 71 | if(s->avctx->debug&FF_DEBUG_PICT_INFO){ |
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| 72 | av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%d\n", |
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| 73 | s->qscale, av_get_picture_type_char(s->pict_type), |
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| 74 | s->gb.size_in_bits, 1-s->no_rounding, |
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| 75 | s->obmc ? " AP" : "", |
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| 76 | s->umvplus ? " UMV" : "", |
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| 77 | s->h263_long_vectors ? " LONG" : "", |
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| 78 | s->h263_plus ? " +" : "", |
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| 79 | s->h263_aic ? " AIC" : "", |
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| 80 | s->alt_inter_vlc ? " AIV" : "", |
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| 81 | s->modified_quant ? " MQ" : "", |
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| 82 | s->loop_filter ? " LOOP" : "", |
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| 83 | s->h263_slice_structured ? " SS" : "", |
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| 84 | s->avctx->time_base.den, s->avctx->time_base.num |
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| 85 | ); |
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| 86 | } |
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| 87 | } |
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| 88 | |||
| 89 | /***********************************************/ |
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| 90 | /* decoding */ |
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| 91 | |||
| 92 | VLC ff_h263_intra_MCBPC_vlc; |
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| 93 | VLC ff_h263_inter_MCBPC_vlc; |
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| 94 | VLC ff_h263_cbpy_vlc; |
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| 95 | static VLC mv_vlc; |
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| 96 | static VLC h263_mbtype_b_vlc; |
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| 97 | static VLC cbpc_b_vlc; |
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| 98 | |||
| 99 | /* init vlcs */ |
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| 100 | |||
| 101 | /* XXX: find a better solution to handle static init */ |
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| 102 | av_cold void ff_h263_decode_init_vlc(void) |
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| 103 | { |
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| 104 | static volatile int done = 0; |
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| 105 | |||
| 106 | if (!done) { |
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| 107 | INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9, |
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| 108 | ff_h263_intra_MCBPC_bits, 1, 1, |
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| 109 | ff_h263_intra_MCBPC_code, 1, 1, 72); |
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| 110 | INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28, |
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| 111 | ff_h263_inter_MCBPC_bits, 1, 1, |
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| 112 | ff_h263_inter_MCBPC_code, 1, 1, 198); |
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| 113 | INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16, |
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| 114 | &ff_h263_cbpy_tab[0][1], 2, 1, |
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| 115 | &ff_h263_cbpy_tab[0][0], 2, 1, 64); |
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| 116 | INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33, |
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| 117 | &ff_mvtab[0][1], 2, 1, |
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| 118 | &ff_mvtab[0][0], 2, 1, 538); |
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| 119 | ff_init_rl(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]); |
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| 120 | ff_init_rl(&ff_rl_intra_aic, ff_h263_static_rl_table_store[1]); |
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| 121 | INIT_VLC_RL(ff_h263_rl_inter, 554); |
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| 122 | INIT_VLC_RL(ff_rl_intra_aic, 554); |
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| 123 | INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15, |
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| 124 | &ff_h263_mbtype_b_tab[0][1], 2, 1, |
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| 125 | &ff_h263_mbtype_b_tab[0][0], 2, 1, 80); |
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| 126 | INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4, |
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| 127 | &ff_cbpc_b_tab[0][1], 2, 1, |
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| 128 | &ff_cbpc_b_tab[0][0], 2, 1, 8); |
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| 129 | done = 1; |
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| 130 | } |
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| 131 | } |
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| 132 | |||
| 133 | int ff_h263_decode_mba(MpegEncContext *s) |
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| 134 | { |
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| 135 | int i, mb_pos; |
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| 136 | |||
| 137 | for(i=0; i<6; i++){ |
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| 138 | if(s->mb_num-1 <= ff_mba_max[i]) break; |
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| 139 | } |
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| 140 | mb_pos= get_bits(&s->gb, ff_mba_length[i]); |
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| 141 | s->mb_x= mb_pos % s->mb_width; |
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| 142 | s->mb_y= mb_pos / s->mb_width; |
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| 143 | |||
| 144 | return mb_pos; |
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| 145 | } |
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| 146 | |||
| 147 | /** |
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| 148 | * Decode the group of blocks header or slice header. |
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| 149 | * @return <0 if an error occurred |
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| 150 | */ |
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| 151 | static int h263_decode_gob_header(MpegEncContext *s) |
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| 152 | { |
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| 153 | unsigned int val, gob_number; |
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| 154 | int left; |
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| 155 | |||
| 156 | /* Check for GOB Start Code */ |
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| 157 | val = show_bits(&s->gb, 16); |
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| 158 | if(val) |
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| 159 | return -1; |
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| 160 | |||
| 161 | /* We have a GBSC probably with GSTUFF */ |
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| 162 | skip_bits(&s->gb, 16); /* Drop the zeros */ |
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| 163 | left= get_bits_left(&s->gb); |
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| 164 | //MN: we must check the bits left or we might end in a infinite loop (or segfault) |
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| 165 | for(;left>13; left--){ |
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| 166 | if(get_bits1(&s->gb)) break; /* Seek the '1' bit */ |
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| 167 | } |
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| 168 | if(left<=13) |
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| 169 | return -1; |
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| 170 | |||
| 171 | if(s->h263_slice_structured){ |
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| 172 | if(get_bits1(&s->gb)==0) |
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| 173 | return -1; |
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| 174 | |||
| 175 | ff_h263_decode_mba(s); |
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| 176 | |||
| 177 | if(s->mb_num > 1583) |
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| 178 | if(get_bits1(&s->gb)==0) |
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| 179 | return -1; |
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| 180 | |||
| 181 | s->qscale = get_bits(&s->gb, 5); /* SQUANT */ |
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| 182 | if(get_bits1(&s->gb)==0) |
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| 183 | return -1; |
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| 184 | skip_bits(&s->gb, 2); /* GFID */ |
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| 185 | }else{ |
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| 186 | gob_number = get_bits(&s->gb, 5); /* GN */ |
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| 187 | s->mb_x= 0; |
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| 188 | s->mb_y= s->gob_index* gob_number; |
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| 189 | skip_bits(&s->gb, 2); /* GFID */ |
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| 190 | s->qscale = get_bits(&s->gb, 5); /* GQUANT */ |
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| 191 | } |
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| 192 | |||
| 193 | if(s->mb_y >= s->mb_height) |
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| 194 | return -1; |
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| 195 | |||
| 196 | if(s->qscale==0) |
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| 197 | return -1; |
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| 198 | |||
| 199 | return 0; |
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| 200 | } |
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| 201 | |||
| 202 | /** |
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| 203 | * Find the next resync_marker. |
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| 204 | * @param p pointer to buffer to scan |
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| 205 | * @param end pointer to the end of the buffer |
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| 206 | * @return pointer to the next resync_marker, or end if none was found |
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| 207 | */ |
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| 208 | const uint8_t *ff_h263_find_resync_marker(MpegEncContext *s, const uint8_t *av_restrict p, const uint8_t *av_restrict end) |
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| 209 | { |
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| 210 | av_assert2(p < end); |
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| 211 | |||
| 212 | end-=2; |
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| 213 | p++; |
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| 214 | if(s->resync_marker){ |
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| 215 | int prefix_len = ff_mpeg4_get_video_packet_prefix_length(s); |
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| 216 | for(;p |
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| 217 | if(!*p){ |
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| 218 | if (!p[-1] && ((p[1] >> (23-prefix_len)) == 1)) return p - 1; |
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| 219 | else if (!p[ 1] && ((p[2] >> (23-prefix_len)) == 1)) return p; |
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| 220 | } |
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| 221 | } |
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| 222 | } |
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| 223 | return end+2; |
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| 224 | } |
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| 225 | |||
| 226 | /** |
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| 227 | * Decode the group of blocks / video packet header. |
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| 228 | * @return bit position of the resync_marker, or <0 if none was found |
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| 229 | */ |
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| 230 | int ff_h263_resync(MpegEncContext *s){ |
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| 231 | int left, pos, ret; |
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| 232 | |||
| 233 | if(s->codec_id==AV_CODEC_ID_MPEG4){ |
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| 234 | skip_bits1(&s->gb); |
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| 235 | align_get_bits(&s->gb); |
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| 236 | } |
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| 237 | |||
| 238 | if(show_bits(&s->gb, 16)==0){ |
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| 239 | pos= get_bits_count(&s->gb); |
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| 240 | if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4) |
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| 241 | ret= ff_mpeg4_decode_video_packet_header(s); |
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| 242 | else |
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| 243 | ret= h263_decode_gob_header(s); |
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| 244 | if(ret>=0) |
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| 245 | return pos; |
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| 246 | } |
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| 247 | //OK, it's not where it is supposed to be ... |
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| 248 | s->gb= s->last_resync_gb; |
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| 249 | align_get_bits(&s->gb); |
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| 250 | left= get_bits_left(&s->gb); |
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| 251 | |||
| 252 | for(;left>16+1+5+5; left-=8){ |
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| 253 | if(show_bits(&s->gb, 16)==0){ |
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| 254 | GetBitContext bak= s->gb; |
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| 255 | |||
| 256 | pos= get_bits_count(&s->gb); |
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| 257 | if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4) |
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| 258 | ret= ff_mpeg4_decode_video_packet_header(s); |
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| 259 | else |
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| 260 | ret= h263_decode_gob_header(s); |
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| 261 | if(ret>=0) |
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| 262 | return pos; |
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| 263 | |||
| 264 | s->gb= bak; |
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| 265 | } |
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| 266 | skip_bits(&s->gb, 8); |
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| 267 | } |
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| 268 | |||
| 269 | return -1; |
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| 270 | } |
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| 271 | |||
| 272 | int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code) |
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| 273 | { |
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| 274 | int code, val, sign, shift; |
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| 275 | code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2); |
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| 276 | |||
| 277 | if (code == 0) |
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| 278 | return pred; |
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| 279 | if (code < 0) |
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| 280 | return 0xffff; |
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| 281 | |||
| 282 | sign = get_bits1(&s->gb); |
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| 283 | shift = f_code - 1; |
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| 284 | val = code; |
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| 285 | if (shift) { |
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| 286 | val = (val - 1) << shift; |
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| 287 | val |= get_bits(&s->gb, shift); |
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| 288 | val++; |
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| 289 | } |
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| 290 | if (sign) |
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| 291 | val = -val; |
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| 292 | val += pred; |
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| 293 | |||
| 294 | /* modulo decoding */ |
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| 295 | if (!s->h263_long_vectors) { |
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| 296 | val = sign_extend(val, 5 + f_code); |
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| 297 | } else { |
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| 298 | /* horrible h263 long vector mode */ |
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| 299 | if (pred < -31 && val < -63) |
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| 300 | val += 64; |
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| 301 | if (pred > 32 && val > 63) |
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| 302 | val -= 64; |
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| 303 | |||
| 304 | } |
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| 305 | return val; |
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| 306 | } |
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| 307 | |||
| 308 | |||
| 309 | /* Decode RVLC of H.263+ UMV */ |
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| 310 | static int h263p_decode_umotion(MpegEncContext * s, int pred) |
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| 311 | { |
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| 312 | int code = 0, sign; |
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| 313 | |||
| 314 | if (get_bits1(&s->gb)) /* Motion difference = 0 */ |
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| 315 | return pred; |
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| 316 | |||
| 317 | code = 2 + get_bits1(&s->gb); |
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| 318 | |||
| 319 | while (get_bits1(&s->gb)) |
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| 320 | { |
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| 321 | code <<= 1; |
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| 322 | code += get_bits1(&s->gb); |
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| 323 | } |
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| 324 | sign = code & 1; |
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| 325 | code >>= 1; |
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| 326 | |||
| 327 | code = (sign) ? (pred - code) : (pred + code); |
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| 328 | av_dlog(s->avctx,"H.263+ UMV Motion = %d\n", code); |
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| 329 | return code; |
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| 330 | |||
| 331 | } |
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| 332 | |||
| 333 | /** |
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| 334 | * read the next MVs for OBMC. yes this is a ugly hack, feel free to send a patch :) |
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| 335 | */ |
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| 336 | static void preview_obmc(MpegEncContext *s){ |
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| 337 | GetBitContext gb= s->gb; |
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| 338 | |||
| 339 | int cbpc, i, pred_x, pred_y, mx, my; |
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| 340 | int16_t *mot_val; |
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| 341 | const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride; |
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| 342 | const int stride= s->b8_stride*2; |
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| 343 | |||
| 344 | for(i=0; i<4; i++) |
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| 345 | s->block_index[i]+= 2; |
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| 346 | for(i=4; i<6; i++) |
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| 347 | s->block_index[i]+= 1; |
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| 348 | s->mb_x++; |
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| 349 | |||
| 350 | av_assert2(s->pict_type == AV_PICTURE_TYPE_P); |
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| 351 | |||
| 352 | do{ |
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| 353 | if (get_bits1(&s->gb)) { |
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| 354 | /* skip mb */ |
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| 355 | mot_val = s->current_picture.motion_val[0][s->block_index[0]]; |
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| 356 | mot_val[0 ]= mot_val[2 ]= |
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| 357 | mot_val[0+stride]= mot_val[2+stride]= 0; |
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| 358 | mot_val[1 ]= mot_val[3 ]= |
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| 359 | mot_val[1+stride]= mot_val[3+stride]= 0; |
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| 360 | |||
| 361 | s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; |
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| 362 | goto end; |
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| 363 | } |
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| 364 | cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); |
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| 365 | }while(cbpc == 20); |
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| 366 | |||
| 367 | if(cbpc & 4){ |
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| 368 | s->current_picture.mb_type[xy] = MB_TYPE_INTRA; |
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| 369 | }else{ |
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| 370 | get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
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| 371 | if (cbpc & 8) { |
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| 372 | if(s->modified_quant){ |
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| 373 | if(get_bits1(&s->gb)) skip_bits(&s->gb, 1); |
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| 374 | else skip_bits(&s->gb, 5); |
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| 375 | }else |
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| 376 | skip_bits(&s->gb, 2); |
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| 377 | } |
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| 378 | |||
| 379 | if ((cbpc & 16) == 0) { |
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| 380 | s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0; |
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| 381 | /* 16x16 motion prediction */ |
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| 382 | mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); |
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| 383 | if (s->umvplus) |
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| 384 | mx = h263p_decode_umotion(s, pred_x); |
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| 385 | else |
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| 386 | mx = ff_h263_decode_motion(s, pred_x, 1); |
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| 387 | |||
| 388 | if (s->umvplus) |
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| 389 | my = h263p_decode_umotion(s, pred_y); |
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| 390 | else |
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| 391 | my = ff_h263_decode_motion(s, pred_y, 1); |
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| 392 | |||
| 393 | mot_val[0 ]= mot_val[2 ]= |
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| 394 | mot_val[0+stride]= mot_val[2+stride]= mx; |
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| 395 | mot_val[1 ]= mot_val[3 ]= |
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| 396 | mot_val[1+stride]= mot_val[3+stride]= my; |
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| 397 | } else { |
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| 398 | s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0; |
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| 399 | for(i=0;i<4;i++) { |
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| 400 | mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); |
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| 401 | if (s->umvplus) |
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| 402 | mx = h263p_decode_umotion(s, pred_x); |
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| 403 | else |
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| 404 | mx = ff_h263_decode_motion(s, pred_x, 1); |
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| 405 | |||
| 406 | if (s->umvplus) |
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| 407 | my = h263p_decode_umotion(s, pred_y); |
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| 408 | else |
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| 409 | my = ff_h263_decode_motion(s, pred_y, 1); |
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| 410 | if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1) |
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| 411 | skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */ |
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| 412 | mot_val[0] = mx; |
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| 413 | mot_val[1] = my; |
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| 414 | } |
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| 415 | } |
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| 416 | } |
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| 417 | end: |
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| 418 | |||
| 419 | for(i=0; i<4; i++) |
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| 420 | s->block_index[i]-= 2; |
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| 421 | for(i=4; i<6; i++) |
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| 422 | s->block_index[i]-= 1; |
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| 423 | s->mb_x--; |
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| 424 | |||
| 425 | s->gb= gb; |
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| 426 | } |
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| 427 | |||
| 428 | static void h263_decode_dquant(MpegEncContext *s){ |
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| 429 | static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; |
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| 430 | |||
| 431 | if(s->modified_quant){ |
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| 432 | if(get_bits1(&s->gb)) |
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| 433 | s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ]; |
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| 434 | else |
||
| 435 | s->qscale= get_bits(&s->gb, 5); |
||
| 436 | }else |
||
| 437 | s->qscale += quant_tab[get_bits(&s->gb, 2)]; |
||
| 438 | ff_set_qscale(s, s->qscale); |
||
| 439 | } |
||
| 440 | |||
| 441 | static int h263_decode_block(MpegEncContext * s, int16_t * block, |
||
| 442 | int n, int coded) |
||
| 443 | { |
||
| 444 | int code, level, i, j, last, run; |
||
| 445 | RLTable *rl = &ff_h263_rl_inter; |
||
| 446 | const uint8_t *scan_table; |
||
| 447 | GetBitContext gb= s->gb; |
||
| 448 | |||
| 449 | scan_table = s->intra_scantable.permutated; |
||
| 450 | if (s->h263_aic && s->mb_intra) { |
||
| 451 | rl = &ff_rl_intra_aic; |
||
| 452 | i = 0; |
||
| 453 | if (s->ac_pred) { |
||
| 454 | if (s->h263_aic_dir) |
||
| 455 | scan_table = s->intra_v_scantable.permutated; /* left */ |
||
| 456 | else |
||
| 457 | scan_table = s->intra_h_scantable.permutated; /* top */ |
||
| 458 | } |
||
| 459 | } else if (s->mb_intra) { |
||
| 460 | /* DC coef */ |
||
| 461 | if(s->codec_id == AV_CODEC_ID_RV10){ |
||
| 462 | #if CONFIG_RV10_DECODER |
||
| 463 | if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) { |
||
| 464 | int component, diff; |
||
| 465 | component = (n <= 3 ? 0 : n - 4 + 1); |
||
| 466 | level = s->last_dc[component]; |
||
| 467 | if (s->rv10_first_dc_coded[component]) { |
||
| 468 | diff = ff_rv_decode_dc(s, n); |
||
| 469 | if (diff == 0xffff) |
||
| 470 | return -1; |
||
| 471 | level += diff; |
||
| 472 | level = level & 0xff; /* handle wrap round */ |
||
| 473 | s->last_dc[component] = level; |
||
| 474 | } else { |
||
| 475 | s->rv10_first_dc_coded[component] = 1; |
||
| 476 | } |
||
| 477 | } else { |
||
| 478 | level = get_bits(&s->gb, 8); |
||
| 479 | if (level == 255) |
||
| 480 | level = 128; |
||
| 481 | } |
||
| 482 | #endif |
||
| 483 | }else{ |
||
| 484 | level = get_bits(&s->gb, 8); |
||
| 485 | if((level&0x7F) == 0){ |
||
| 486 | av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y); |
||
| 487 | if(s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) |
||
| 488 | return -1; |
||
| 489 | } |
||
| 490 | if (level == 255) |
||
| 491 | level = 128; |
||
| 492 | } |
||
| 493 | block[0] = level; |
||
| 494 | i = 1; |
||
| 495 | } else { |
||
| 496 | i = 0; |
||
| 497 | } |
||
| 498 | if (!coded) { |
||
| 499 | if (s->mb_intra && s->h263_aic) |
||
| 500 | goto not_coded; |
||
| 501 | s->block_last_index[n] = i - 1; |
||
| 502 | return 0; |
||
| 503 | } |
||
| 504 | retry: |
||
| 505 | for(;;) { |
||
| 506 | code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2); |
||
| 507 | if (code < 0){ |
||
| 508 | av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y); |
||
| 509 | return -1; |
||
| 510 | } |
||
| 511 | if (code == rl->n) { |
||
| 512 | /* escape */ |
||
| 513 | if (CONFIG_FLV_DECODER && s->h263_flv > 1) { |
||
| 514 | ff_flv2_decode_ac_esc(&s->gb, &level, &run, &last); |
||
| 515 | } else { |
||
| 516 | last = get_bits1(&s->gb); |
||
| 517 | run = get_bits(&s->gb, 6); |
||
| 518 | level = (int8_t)get_bits(&s->gb, 8); |
||
| 519 | if(level == -128){ |
||
| 520 | if (s->codec_id == AV_CODEC_ID_RV10) { |
||
| 521 | /* XXX: should patch encoder too */ |
||
| 522 | level = get_sbits(&s->gb, 12); |
||
| 523 | }else{ |
||
| 524 | level = get_bits(&s->gb, 5); |
||
| 525 | level |= get_sbits(&s->gb, 6)<<5; |
||
| 526 | } |
||
| 527 | } |
||
| 528 | } |
||
| 529 | } else { |
||
| 530 | run = rl->table_run[code]; |
||
| 531 | level = rl->table_level[code]; |
||
| 532 | last = code >= rl->last; |
||
| 533 | if (get_bits1(&s->gb)) |
||
| 534 | level = -level; |
||
| 535 | } |
||
| 536 | i += run; |
||
| 537 | if (i >= 64){ |
||
| 538 | if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){ |
||
| 539 | //Looks like a hack but no, it's the way it is supposed to work ... |
||
| 540 | rl = &ff_rl_intra_aic; |
||
| 541 | i = 0; |
||
| 542 | s->gb= gb; |
||
| 543 | s->dsp.clear_block(block); |
||
| 544 | goto retry; |
||
| 545 | } |
||
| 546 | av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra); |
||
| 547 | return -1; |
||
| 548 | } |
||
| 549 | j = scan_table[i]; |
||
| 550 | block[j] = level; |
||
| 551 | if (last) |
||
| 552 | break; |
||
| 553 | i++; |
||
| 554 | } |
||
| 555 | not_coded: |
||
| 556 | if (s->mb_intra && s->h263_aic) { |
||
| 557 | ff_h263_pred_acdc(s, block, n); |
||
| 558 | i = 63; |
||
| 559 | } |
||
| 560 | s->block_last_index[n] = i; |
||
| 561 | return 0; |
||
| 562 | } |
||
| 563 | |||
| 564 | static int h263_skip_b_part(MpegEncContext *s, int cbp) |
||
| 565 | { |
||
| 566 | LOCAL_ALIGNED_16(int16_t, dblock, [64]); |
||
| 567 | int i, mbi; |
||
| 568 | int bli[6]; |
||
| 569 | |||
| 570 | /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly |
||
| 571 | * but real value should be restored in order to be used later (in OBMC condition) |
||
| 572 | */ |
||
| 573 | mbi = s->mb_intra; |
||
| 574 | memcpy(bli, s->block_last_index, sizeof(bli)); |
||
| 575 | s->mb_intra = 0; |
||
| 576 | for (i = 0; i < 6; i++) { |
||
| 577 | if (h263_decode_block(s, dblock, i, cbp&32) < 0) |
||
| 578 | return -1; |
||
| 579 | cbp+=cbp; |
||
| 580 | } |
||
| 581 | s->mb_intra = mbi; |
||
| 582 | memcpy(s->block_last_index, bli, sizeof(bli)); |
||
| 583 | return 0; |
||
| 584 | } |
||
| 585 | |||
| 586 | static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb) |
||
| 587 | { |
||
| 588 | int c, mv = 1; |
||
| 589 | |||
| 590 | if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame |
||
| 591 | c = get_bits1(gb); |
||
| 592 | if (pb_frame == 2 && c) |
||
| 593 | mv = !get_bits1(gb); |
||
| 594 | } else { // h.263 Annex M improved PB-frame |
||
| 595 | mv = get_unary(gb, 0, 4) + 1; |
||
| 596 | c = mv & 1; |
||
| 597 | mv = !!(mv & 2); |
||
| 598 | } |
||
| 599 | if(c) |
||
| 600 | *cbpb = get_bits(gb, 6); |
||
| 601 | return mv; |
||
| 602 | } |
||
| 603 | |||
| 604 | int ff_h263_decode_mb(MpegEncContext *s, |
||
| 605 | int16_t block[6][64]) |
||
| 606 | { |
||
| 607 | int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant; |
||
| 608 | int16_t *mot_val; |
||
| 609 | const int xy= s->mb_x + s->mb_y * s->mb_stride; |
||
| 610 | int cbpb = 0, pb_mv_count = 0; |
||
| 611 | |||
| 612 | av_assert2(!s->h263_pred); |
||
| 613 | |||
| 614 | if (s->pict_type == AV_PICTURE_TYPE_P) { |
||
| 615 | do{ |
||
| 616 | if (get_bits1(&s->gb)) { |
||
| 617 | /* skip mb */ |
||
| 618 | s->mb_intra = 0; |
||
| 619 | for(i=0;i<6;i++) |
||
| 620 | s->block_last_index[i] = -1; |
||
| 621 | s->mv_dir = MV_DIR_FORWARD; |
||
| 622 | s->mv_type = MV_TYPE_16X16; |
||
| 623 | s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; |
||
| 624 | s->mv[0][0][0] = 0; |
||
| 625 | s->mv[0][0][1] = 0; |
||
| 626 | s->mb_skipped = !(s->obmc | s->loop_filter); |
||
| 627 | goto end; |
||
| 628 | } |
||
| 629 | cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); |
||
| 630 | if (cbpc < 0){ |
||
| 631 | av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y); |
||
| 632 | return -1; |
||
| 633 | } |
||
| 634 | }while(cbpc == 20); |
||
| 635 | |||
| 636 | s->dsp.clear_blocks(s->block[0]); |
||
| 637 | |||
| 638 | dquant = cbpc & 8; |
||
| 639 | s->mb_intra = ((cbpc & 4) != 0); |
||
| 640 | if (s->mb_intra) goto intra; |
||
| 641 | |||
| 642 | if(s->pb_frame && get_bits1(&s->gb)) |
||
| 643 | pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb); |
||
| 644 | cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
||
| 645 | |||
| 646 | if(s->alt_inter_vlc==0 || (cbpc & 3)!=3) |
||
| 647 | cbpy ^= 0xF; |
||
| 648 | |||
| 649 | cbp = (cbpc & 3) | (cbpy << 2); |
||
| 650 | if (dquant) { |
||
| 651 | h263_decode_dquant(s); |
||
| 652 | } |
||
| 653 | |||
| 654 | s->mv_dir = MV_DIR_FORWARD; |
||
| 655 | if ((cbpc & 16) == 0) { |
||
| 656 | s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0; |
||
| 657 | /* 16x16 motion prediction */ |
||
| 658 | s->mv_type = MV_TYPE_16X16; |
||
| 659 | ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); |
||
| 660 | if (s->umvplus) |
||
| 661 | mx = h263p_decode_umotion(s, pred_x); |
||
| 662 | else |
||
| 663 | mx = ff_h263_decode_motion(s, pred_x, 1); |
||
| 664 | |||
| 665 | if (mx >= 0xffff) |
||
| 666 | return -1; |
||
| 667 | |||
| 668 | if (s->umvplus) |
||
| 669 | my = h263p_decode_umotion(s, pred_y); |
||
| 670 | else |
||
| 671 | my = ff_h263_decode_motion(s, pred_y, 1); |
||
| 672 | |||
| 673 | if (my >= 0xffff) |
||
| 674 | return -1; |
||
| 675 | s->mv[0][0][0] = mx; |
||
| 676 | s->mv[0][0][1] = my; |
||
| 677 | |||
| 678 | if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1) |
||
| 679 | skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */ |
||
| 680 | } else { |
||
| 681 | s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0; |
||
| 682 | s->mv_type = MV_TYPE_8X8; |
||
| 683 | for(i=0;i<4;i++) { |
||
| 684 | mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); |
||
| 685 | if (s->umvplus) |
||
| 686 | mx = h263p_decode_umotion(s, pred_x); |
||
| 687 | else |
||
| 688 | mx = ff_h263_decode_motion(s, pred_x, 1); |
||
| 689 | if (mx >= 0xffff) |
||
| 690 | return -1; |
||
| 691 | |||
| 692 | if (s->umvplus) |
||
| 693 | my = h263p_decode_umotion(s, pred_y); |
||
| 694 | else |
||
| 695 | my = ff_h263_decode_motion(s, pred_y, 1); |
||
| 696 | if (my >= 0xffff) |
||
| 697 | return -1; |
||
| 698 | s->mv[0][i][0] = mx; |
||
| 699 | s->mv[0][i][1] = my; |
||
| 700 | if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1) |
||
| 701 | skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */ |
||
| 702 | mot_val[0] = mx; |
||
| 703 | mot_val[1] = my; |
||
| 704 | } |
||
| 705 | } |
||
| 706 | } else if(s->pict_type==AV_PICTURE_TYPE_B) { |
||
| 707 | int mb_type; |
||
| 708 | const int stride= s->b8_stride; |
||
| 709 | int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)]; |
||
| 710 | int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)]; |
||
| 711 | // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride; |
||
| 712 | |||
| 713 | //FIXME ugly |
||
| 714 | mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]= |
||
| 715 | mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]= |
||
| 716 | mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]= |
||
| 717 | mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0; |
||
| 718 | |||
| 719 | do{ |
||
| 720 | mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2); |
||
| 721 | if (mb_type < 0){ |
||
| 722 | av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y); |
||
| 723 | return -1; |
||
| 724 | } |
||
| 725 | |||
| 726 | mb_type= h263_mb_type_b_map[ mb_type ]; |
||
| 727 | }while(!mb_type); |
||
| 728 | |||
| 729 | s->mb_intra = IS_INTRA(mb_type); |
||
| 730 | if(HAS_CBP(mb_type)){ |
||
| 731 | s->dsp.clear_blocks(s->block[0]); |
||
| 732 | cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1); |
||
| 733 | if(s->mb_intra){ |
||
| 734 | dquant = IS_QUANT(mb_type); |
||
| 735 | goto intra; |
||
| 736 | } |
||
| 737 | |||
| 738 | cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
||
| 739 | |||
| 740 | if (cbpy < 0){ |
||
| 741 | av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y); |
||
| 742 | return -1; |
||
| 743 | } |
||
| 744 | |||
| 745 | if(s->alt_inter_vlc==0 || (cbpc & 3)!=3) |
||
| 746 | cbpy ^= 0xF; |
||
| 747 | |||
| 748 | cbp = (cbpc & 3) | (cbpy << 2); |
||
| 749 | }else |
||
| 750 | cbp=0; |
||
| 751 | |||
| 752 | av_assert2(!s->mb_intra); |
||
| 753 | |||
| 754 | if(IS_QUANT(mb_type)){ |
||
| 755 | h263_decode_dquant(s); |
||
| 756 | } |
||
| 757 | |||
| 758 | if(IS_DIRECT(mb_type)){ |
||
| 759 | s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT; |
||
| 760 | mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0); |
||
| 761 | }else{ |
||
| 762 | s->mv_dir = 0; |
||
| 763 | s->mv_type= MV_TYPE_16X16; |
||
| 764 | //FIXME UMV |
||
| 765 | |||
| 766 | if(USES_LIST(mb_type, 0)){ |
||
| 767 | int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my); |
||
| 768 | s->mv_dir = MV_DIR_FORWARD; |
||
| 769 | |||
| 770 | mx = ff_h263_decode_motion(s, mx, 1); |
||
| 771 | my = ff_h263_decode_motion(s, my, 1); |
||
| 772 | |||
| 773 | s->mv[0][0][0] = mx; |
||
| 774 | s->mv[0][0][1] = my; |
||
| 775 | mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx; |
||
| 776 | mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my; |
||
| 777 | } |
||
| 778 | |||
| 779 | if(USES_LIST(mb_type, 1)){ |
||
| 780 | int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my); |
||
| 781 | s->mv_dir |= MV_DIR_BACKWARD; |
||
| 782 | |||
| 783 | mx = ff_h263_decode_motion(s, mx, 1); |
||
| 784 | my = ff_h263_decode_motion(s, my, 1); |
||
| 785 | |||
| 786 | s->mv[1][0][0] = mx; |
||
| 787 | s->mv[1][0][1] = my; |
||
| 788 | mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx; |
||
| 789 | mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my; |
||
| 790 | } |
||
| 791 | } |
||
| 792 | |||
| 793 | s->current_picture.mb_type[xy] = mb_type; |
||
| 794 | } else { /* I-Frame */ |
||
| 795 | do{ |
||
| 796 | cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); |
||
| 797 | if (cbpc < 0){ |
||
| 798 | av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y); |
||
| 799 | return -1; |
||
| 800 | } |
||
| 801 | }while(cbpc == 8); |
||
| 802 | |||
| 803 | s->dsp.clear_blocks(s->block[0]); |
||
| 804 | |||
| 805 | dquant = cbpc & 4; |
||
| 806 | s->mb_intra = 1; |
||
| 807 | intra: |
||
| 808 | s->current_picture.mb_type[xy] = MB_TYPE_INTRA; |
||
| 809 | if (s->h263_aic) { |
||
| 810 | s->ac_pred = get_bits1(&s->gb); |
||
| 811 | if(s->ac_pred){ |
||
| 812 | s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED; |
||
| 813 | |||
| 814 | s->h263_aic_dir = get_bits1(&s->gb); |
||
| 815 | } |
||
| 816 | }else |
||
| 817 | s->ac_pred = 0; |
||
| 818 | |||
| 819 | if(s->pb_frame && get_bits1(&s->gb)) |
||
| 820 | pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb); |
||
| 821 | cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
||
| 822 | if(cbpy<0){ |
||
| 823 | av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y); |
||
| 824 | return -1; |
||
| 825 | } |
||
| 826 | cbp = (cbpc & 3) | (cbpy << 2); |
||
| 827 | if (dquant) { |
||
| 828 | h263_decode_dquant(s); |
||
| 829 | } |
||
| 830 | |||
| 831 | pb_mv_count += !!s->pb_frame; |
||
| 832 | } |
||
| 833 | |||
| 834 | while(pb_mv_count--){ |
||
| 835 | ff_h263_decode_motion(s, 0, 1); |
||
| 836 | ff_h263_decode_motion(s, 0, 1); |
||
| 837 | } |
||
| 838 | |||
| 839 | /* decode each block */ |
||
| 840 | for (i = 0; i < 6; i++) { |
||
| 841 | if (h263_decode_block(s, block[i], i, cbp&32) < 0) |
||
| 842 | return -1; |
||
| 843 | cbp+=cbp; |
||
| 844 | } |
||
| 845 | |||
| 846 | if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0) |
||
| 847 | return -1; |
||
| 848 | if(s->obmc && !s->mb_intra){ |
||
| 849 | if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1 |
||
| 850 | preview_obmc(s); |
||
| 851 | } |
||
| 852 | end: |
||
| 853 | |||
| 854 | /* per-MB end of slice check */ |
||
| 855 | { |
||
| 856 | int v= show_bits(&s->gb, 16); |
||
| 857 | |||
| 858 | if (get_bits_left(&s->gb) < 16) { |
||
| 859 | v >>= 16 - get_bits_left(&s->gb); |
||
| 860 | } |
||
| 861 | |||
| 862 | if(v==0) |
||
| 863 | return SLICE_END; |
||
| 864 | } |
||
| 865 | |||
| 866 | return SLICE_OK; |
||
| 867 | } |
||
| 868 | |||
| 869 | /* most is hardcoded. should extend to handle all h263 streams */ |
||
| 870 | int ff_h263_decode_picture_header(MpegEncContext *s) |
||
| 871 | { |
||
| 872 | int format, width, height, i; |
||
| 873 | uint32_t startcode; |
||
| 874 | |||
| 875 | align_get_bits(&s->gb); |
||
| 876 | |||
| 877 | if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) { |
||
| 878 | av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n"); |
||
| 879 | } |
||
| 880 | |||
| 881 | startcode= get_bits(&s->gb, 22-8); |
||
| 882 | |||
| 883 | for(i= get_bits_left(&s->gb); i>24; i-=8) { |
||
| 884 | startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF; |
||
| 885 | |||
| 886 | if(startcode == 0x20) |
||
| 887 | break; |
||
| 888 | } |
||
| 889 | |||
| 890 | if (startcode != 0x20) { |
||
| 891 | av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n"); |
||
| 892 | return -1; |
||
| 893 | } |
||
| 894 | /* temporal reference */ |
||
| 895 | i = get_bits(&s->gb, 8); /* picture timestamp */ |
||
| 896 | if( (s->picture_number&~0xFF)+i < s->picture_number) |
||
| 897 | i+= 256; |
||
| 898 | s->current_picture_ptr->f.pts = |
||
| 899 | s->picture_number= (s->picture_number&~0xFF) + i; |
||
| 900 | |||
| 901 | /* PTYPE starts here */ |
||
| 902 | if (get_bits1(&s->gb) != 1) { |
||
| 903 | /* marker */ |
||
| 904 | av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n"); |
||
| 905 | return -1; |
||
| 906 | } |
||
| 907 | if (get_bits1(&s->gb) != 0) { |
||
| 908 | av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n"); |
||
| 909 | return -1; /* h263 id */ |
||
| 910 | } |
||
| 911 | skip_bits1(&s->gb); /* split screen off */ |
||
| 912 | skip_bits1(&s->gb); /* camera off */ |
||
| 913 | skip_bits1(&s->gb); /* freeze picture release off */ |
||
| 914 | |||
| 915 | format = get_bits(&s->gb, 3); |
||
| 916 | /* |
||
| 917 | |||
| 918 | 1 sub-QCIF |
||
| 919 | 10 QCIF |
||
| 920 | 7 extended PTYPE (PLUSPTYPE) |
||
| 921 | */ |
||
| 922 | |||
| 923 | if (format != 7 && format != 6) { |
||
| 924 | s->h263_plus = 0; |
||
| 925 | /* H.263v1 */ |
||
| 926 | width = ff_h263_format[format][0]; |
||
| 927 | height = ff_h263_format[format][1]; |
||
| 928 | if (!width) |
||
| 929 | return -1; |
||
| 930 | |||
| 931 | s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb); |
||
| 932 | |||
| 933 | s->h263_long_vectors = get_bits1(&s->gb); |
||
| 934 | |||
| 935 | if (get_bits1(&s->gb) != 0) { |
||
| 936 | av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n"); |
||
| 937 | return -1; /* SAC: off */ |
||
| 938 | } |
||
| 939 | s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */ |
||
| 940 | s->unrestricted_mv = s->h263_long_vectors || s->obmc; |
||
| 941 | |||
| 942 | s->pb_frame = get_bits1(&s->gb); |
||
| 943 | s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); |
||
| 944 | skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */ |
||
| 945 | |||
| 946 | s->width = width; |
||
| 947 | s->height = height; |
||
| 948 | s->avctx->sample_aspect_ratio= (AVRational){12,11}; |
||
| 949 | s->avctx->time_base= (AVRational){1001, 30000}; |
||
| 950 | } else { |
||
| 951 | int ufep; |
||
| 952 | |||
| 953 | /* H.263v2 */ |
||
| 954 | s->h263_plus = 1; |
||
| 955 | ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */ |
||
| 956 | |||
| 957 | /* ufep other than 0 and 1 are reserved */ |
||
| 958 | if (ufep == 1) { |
||
| 959 | /* OPPTYPE */ |
||
| 960 | format = get_bits(&s->gb, 3); |
||
| 961 | av_dlog(s->avctx, "ufep=1, format: %d\n", format); |
||
| 962 | s->custom_pcf= get_bits1(&s->gb); |
||
| 963 | s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */ |
||
| 964 | if (get_bits1(&s->gb) != 0) { |
||
| 965 | av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n"); |
||
| 966 | } |
||
| 967 | s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */ |
||
| 968 | s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */ |
||
| 969 | s->loop_filter= get_bits1(&s->gb); |
||
| 970 | s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter; |
||
| 971 | if(s->avctx->lowres) |
||
| 972 | s->loop_filter = 0; |
||
| 973 | |||
| 974 | s->h263_slice_structured= get_bits1(&s->gb); |
||
| 975 | if (get_bits1(&s->gb) != 0) { |
||
| 976 | av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n"); |
||
| 977 | } |
||
| 978 | if (get_bits1(&s->gb) != 0) { |
||
| 979 | av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n"); |
||
| 980 | } |
||
| 981 | s->alt_inter_vlc= get_bits1(&s->gb); |
||
| 982 | s->modified_quant= get_bits1(&s->gb); |
||
| 983 | if(s->modified_quant) |
||
| 984 | s->chroma_qscale_table= ff_h263_chroma_qscale_table; |
||
| 985 | |||
| 986 | skip_bits(&s->gb, 1); /* Prevent start code emulation */ |
||
| 987 | |||
| 988 | skip_bits(&s->gb, 3); /* Reserved */ |
||
| 989 | } else if (ufep != 0) { |
||
| 990 | av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep); |
||
| 991 | return -1; |
||
| 992 | } |
||
| 993 | |||
| 994 | /* MPPTYPE */ |
||
| 995 | s->pict_type = get_bits(&s->gb, 3); |
||
| 996 | switch(s->pict_type){ |
||
| 997 | case 0: s->pict_type= AV_PICTURE_TYPE_I;break; |
||
| 998 | case 1: s->pict_type= AV_PICTURE_TYPE_P;break; |
||
| 999 | case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break; |
||
| 1000 | case 3: s->pict_type= AV_PICTURE_TYPE_B;break; |
||
| 1001 | case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO |
||
| 1002 | default: |
||
| 1003 | return -1; |
||
| 1004 | } |
||
| 1005 | skip_bits(&s->gb, 2); |
||
| 1006 | s->no_rounding = get_bits1(&s->gb); |
||
| 1007 | skip_bits(&s->gb, 4); |
||
| 1008 | |||
| 1009 | /* Get the picture dimensions */ |
||
| 1010 | if (ufep) { |
||
| 1011 | if (format == 6) { |
||
| 1012 | /* Custom Picture Format (CPFMT) */ |
||
| 1013 | s->aspect_ratio_info = get_bits(&s->gb, 4); |
||
| 1014 | av_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info); |
||
| 1015 | /* aspect ratios: |
||
| 1016 | |||
| 1017 | 1 - 1:1 |
||
| 1018 | 2 - 12:11 (CIF 4:3) |
||
| 1019 | 3 - 10:11 (525-type 4:3) |
||
| 1020 | 4 - 16:11 (CIF 16:9) |
||
| 1021 | 5 - 40:33 (525-type 16:9) |
||
| 1022 | 6-14 - reserved |
||
| 1023 | */ |
||
| 1024 | width = (get_bits(&s->gb, 9) + 1) * 4; |
||
| 1025 | skip_bits1(&s->gb); |
||
| 1026 | height = get_bits(&s->gb, 9) * 4; |
||
| 1027 | av_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height); |
||
| 1028 | if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) { |
||
| 1029 | /* aspected dimensions */ |
||
| 1030 | s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8); |
||
| 1031 | s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8); |
||
| 1032 | }else{ |
||
| 1033 | s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info]; |
||
| 1034 | } |
||
| 1035 | } else { |
||
| 1036 | width = ff_h263_format[format][0]; |
||
| 1037 | height = ff_h263_format[format][1]; |
||
| 1038 | s->avctx->sample_aspect_ratio= (AVRational){12,11}; |
||
| 1039 | } |
||
| 1040 | s->avctx->sample_aspect_ratio.den <<= s->ehc_mode; |
||
| 1041 | if ((width == 0) || (height == 0)) |
||
| 1042 | return -1; |
||
| 1043 | s->width = width; |
||
| 1044 | s->height = height; |
||
| 1045 | |||
| 1046 | if(s->custom_pcf){ |
||
| 1047 | int gcd; |
||
| 1048 | s->avctx->time_base.den= 1800000; |
||
| 1049 | s->avctx->time_base.num= 1000 + get_bits1(&s->gb); |
||
| 1050 | s->avctx->time_base.num*= get_bits(&s->gb, 7); |
||
| 1051 | if(s->avctx->time_base.num == 0){ |
||
| 1052 | av_log(s, AV_LOG_ERROR, "zero framerate\n"); |
||
| 1053 | return -1; |
||
| 1054 | } |
||
| 1055 | gcd= av_gcd(s->avctx->time_base.den, s->avctx->time_base.num); |
||
| 1056 | s->avctx->time_base.den /= gcd; |
||
| 1057 | s->avctx->time_base.num /= gcd; |
||
| 1058 | }else{ |
||
| 1059 | s->avctx->time_base= (AVRational){1001, 30000}; |
||
| 1060 | } |
||
| 1061 | } |
||
| 1062 | |||
| 1063 | if(s->custom_pcf){ |
||
| 1064 | skip_bits(&s->gb, 2); //extended Temporal reference |
||
| 1065 | } |
||
| 1066 | |||
| 1067 | if (ufep) { |
||
| 1068 | if (s->umvplus) { |
||
| 1069 | if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */ |
||
| 1070 | skip_bits1(&s->gb); |
||
| 1071 | } |
||
| 1072 | if(s->h263_slice_structured){ |
||
| 1073 | if (get_bits1(&s->gb) != 0) { |
||
| 1074 | av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n"); |
||
| 1075 | } |
||
| 1076 | if (get_bits1(&s->gb) != 0) { |
||
| 1077 | av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n"); |
||
| 1078 | } |
||
| 1079 | } |
||
| 1080 | } |
||
| 1081 | |||
| 1082 | s->qscale = get_bits(&s->gb, 5); |
||
| 1083 | } |
||
| 1084 | |||
| 1085 | if (s->width == 0 || s->height == 0) { |
||
| 1086 | av_log(s->avctx, AV_LOG_ERROR, "dimensions 0\n"); |
||
| 1087 | return -1; |
||
| 1088 | } |
||
| 1089 | s->mb_width = (s->width + 15) / 16; |
||
| 1090 | s->mb_height = (s->height + 15) / 16; |
||
| 1091 | s->mb_num = s->mb_width * s->mb_height; |
||
| 1092 | |||
| 1093 | if (s->pb_frame) { |
||
| 1094 | skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */ |
||
| 1095 | if (s->custom_pcf) |
||
| 1096 | skip_bits(&s->gb, 2); //extended Temporal reference |
||
| 1097 | skip_bits(&s->gb, 2); /* Quantization information for B-pictures */ |
||
| 1098 | } |
||
| 1099 | |||
| 1100 | if (s->pict_type!=AV_PICTURE_TYPE_B) { |
||
| 1101 | s->time = s->picture_number; |
||
| 1102 | s->pp_time = s->time - s->last_non_b_time; |
||
| 1103 | s->last_non_b_time = s->time; |
||
| 1104 | }else{ |
||
| 1105 | s->time = s->picture_number; |
||
| 1106 | s->pb_time = s->pp_time - (s->last_non_b_time - s->time); |
||
| 1107 | if (s->pp_time <=s->pb_time || |
||
| 1108 | s->pp_time <= s->pp_time - s->pb_time || |
||
| 1109 | s->pp_time <= 0){ |
||
| 1110 | s->pp_time = 2; |
||
| 1111 | s->pb_time = 1; |
||
| 1112 | } |
||
| 1113 | ff_mpeg4_init_direct_mv(s); |
||
| 1114 | } |
||
| 1115 | |||
| 1116 | /* PEI */ |
||
| 1117 | while (get_bits1(&s->gb) != 0) { |
||
| 1118 | skip_bits(&s->gb, 8); |
||
| 1119 | } |
||
| 1120 | |||
| 1121 | if(s->h263_slice_structured){ |
||
| 1122 | if (get_bits1(&s->gb) != 1) { |
||
| 1123 | av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missing\n"); |
||
| 1124 | return -1; |
||
| 1125 | } |
||
| 1126 | |||
| 1127 | ff_h263_decode_mba(s); |
||
| 1128 | |||
| 1129 | if (get_bits1(&s->gb) != 1) { |
||
| 1130 | av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missing\n"); |
||
| 1131 | return -1; |
||
| 1132 | } |
||
| 1133 | } |
||
| 1134 | s->f_code = 1; |
||
| 1135 | |||
| 1136 | if(s->h263_aic){ |
||
| 1137 | s->y_dc_scale_table= |
||
| 1138 | s->c_dc_scale_table= ff_aic_dc_scale_table; |
||
| 1139 | }else{ |
||
| 1140 | s->y_dc_scale_table= |
||
| 1141 | s->c_dc_scale_table= ff_mpeg1_dc_scale_table; |
||
| 1142 | } |
||
| 1143 | |||
| 1144 | ff_h263_show_pict_info(s); |
||
| 1145 | if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){ |
||
| 1146 | int i,j; |
||
| 1147 | for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb)); |
||
| 1148 | av_log(s->avctx, AV_LOG_DEBUG, "\n"); |
||
| 1149 | for(i=0; i<13; i++){ |
||
| 1150 | for(j=0; j<3; j++){ |
||
| 1151 | int v= get_bits(&s->gb, 8); |
||
| 1152 | v |= get_sbits(&s->gb, 8)<<8; |
||
| 1153 | av_log(s->avctx, AV_LOG_DEBUG, " %5d", v); |
||
| 1154 | } |
||
| 1155 | av_log(s->avctx, AV_LOG_DEBUG, "\n"); |
||
| 1156 | } |
||
| 1157 | for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb)); |
||
| 1158 | } |
||
| 1159 | |||
| 1160 | return 0; |
||
| 1161 | } |