2010-01-09 16:59:06 +02:00
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/*
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2016-04-27 19:45:23 +02:00
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* ITU H.263 bitstream decoder
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2010-01-09 16:59:06 +02:00
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* Copyright (c) 2000,2001 Fabrice Bellard
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2016-04-27 19:45:23 +02:00
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* H.263+ support.
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2010-01-09 16:59:06 +02:00
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* Copyright (c) 2001 Juan J. Sierralta P
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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2010-04-20 17:45:34 +03:00
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* @file
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2016-04-27 19:45:23 +02:00
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* H.263 decoder.
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2010-01-09 16:59:06 +02:00
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*/
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2011-12-18 05:19:40 +03:00
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#define UNCHECKED_BITSTREAM_READER 1
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2010-01-09 16:59:06 +02:00
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2022-02-23 14:56:49 +02:00
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#include "config_components.h"
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2013-02-01 12:31:59 +03:00
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#include "libavutil/attributes.h"
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2015-06-26 15:57:16 +02:00
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#include "libavutil/imgutils.h"
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2013-02-08 02:31:13 +03:00
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#include "libavutil/internal.h"
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2011-06-04 14:58:23 +03:00
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#include "libavutil/mathematics.h"
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2020-06-10 15:38:08 +02:00
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#include "libavutil/mem_internal.h"
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2022-02-11 20:27:55 +02:00
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#include "libavutil/thread.h"
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2010-01-09 16:59:06 +02:00
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#include "avcodec.h"
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#include "mpegvideo.h"
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#include "h263.h"
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2015-06-10 15:29:05 +02:00
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#include "h263data.h"
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2022-01-24 22:54:45 +02:00
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#include "h263dec.h"
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2010-01-09 16:59:06 +02:00
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#include "mathops.h"
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2014-02-28 15:40:54 +03:00
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#include "mpegutils.h"
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2010-01-09 16:59:06 +02:00
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#include "unary.h"
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2022-02-01 12:05:51 +02:00
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#include "rv10dec.h"
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2010-01-09 16:59:06 +02:00
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#include "mpeg4video.h"
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2015-05-29 20:44:03 +02:00
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#include "mpegvideodata.h"
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2021-01-27 20:06:36 +02:00
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#include "mpegvideodec.h"
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2022-02-01 08:31:26 +02:00
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#include "mpeg4videodec.h"
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2022-08-28 13:09:19 +02:00
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#include "mpeg4videodefs.h"
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2010-01-09 16:59:06 +02:00
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// The defines below define the number of bits that are read at once for
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// reading vlc values. Changing these may improve speed and data cache needs
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// be aware though that decreasing them may need the number of stages that is
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// passed to get_vlc* to be increased.
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#define H263_MBTYPE_B_VLC_BITS 6
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#define CBPC_B_VLC_BITS 3
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static const int h263_mb_type_b_map[15]= {
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MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
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MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP,
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MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT,
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MB_TYPE_L0 | MB_TYPE_16x16,
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MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_16x16,
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MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
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MB_TYPE_L1 | MB_TYPE_16x16,
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MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_16x16,
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MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
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MB_TYPE_L0L1 | MB_TYPE_16x16,
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MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_16x16,
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MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
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0, //stuffing
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MB_TYPE_INTRA4x4 | MB_TYPE_CBP,
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MB_TYPE_INTRA4x4 | MB_TYPE_CBP | MB_TYPE_QUANT,
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};
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void ff_h263_show_pict_info(MpegEncContext *s){
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if(s->avctx->debug&FF_DEBUG_PICT_INFO){
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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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2011-04-28 02:03:28 +03:00
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s->qscale, av_get_picture_type_char(s->pict_type),
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2010-01-09 16:59:06 +02:00
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s->gb.size_in_bits, 1-s->no_rounding,
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s->obmc ? " AP" : "",
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s->umvplus ? " UMV" : "",
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s->h263_long_vectors ? " LONG" : "",
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s->h263_plus ? " +" : "",
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s->h263_aic ? " AIC" : "",
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s->alt_inter_vlc ? " AIV" : "",
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s->modified_quant ? " MQ" : "",
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s->loop_filter ? " LOOP" : "",
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s->h263_slice_structured ? " SS" : "",
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2014-04-04 13:47:44 +03:00
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s->avctx->framerate.num, s->avctx->framerate.den
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2010-01-09 16:59:06 +02:00
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);
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}
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}
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/***********************************************/
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/* decoding */
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2023-09-20 19:30:32 +02:00
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VLCElem ff_h263_intra_MCBPC_vlc[72];
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VLCElem ff_h263_inter_MCBPC_vlc[198];
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VLCElem ff_h263_cbpy_vlc[64];
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VLCElem ff_h263_mv_vlc[538];
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static VLCElem h263_mbtype_b_vlc[80];
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static VLCElem cbpc_b_vlc[8];
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2010-01-09 16:59:06 +02:00
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/* init vlcs */
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2022-02-11 20:27:55 +02:00
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static av_cold void h263_decode_init_vlc(void)
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2010-01-09 16:59:06 +02:00
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{
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2023-09-20 19:30:32 +02:00
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VLC_INIT_STATIC_TABLE(ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
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ff_h263_intra_MCBPC_bits, 1, 1,
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ff_h263_intra_MCBPC_code, 1, 1, 0);
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VLC_INIT_STATIC_TABLE(ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
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ff_h263_inter_MCBPC_bits, 1, 1,
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ff_h263_inter_MCBPC_code, 1, 1, 0);
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VLC_INIT_STATIC_TABLE(ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
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&ff_h263_cbpy_tab[0][1], 2, 1,
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&ff_h263_cbpy_tab[0][0], 2, 1, 0);
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VLC_INIT_STATIC_TABLE(ff_h263_mv_vlc, H263_MV_VLC_BITS, 33,
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&ff_mvtab[0][1], 2, 1,
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&ff_mvtab[0][0], 2, 1, 0);
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2022-02-11 20:30:41 +02:00
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ff_h263_init_rl_inter();
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2023-09-08 15:18:12 +02:00
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VLC_INIT_RL(ff_h263_rl_inter, 554);
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2022-02-11 20:30:41 +02:00
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INIT_FIRST_VLC_RL(ff_rl_intra_aic, 554);
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2023-09-20 19:30:32 +02:00
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VLC_INIT_STATIC_TABLE(h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
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&ff_h263_mbtype_b_tab[0][1], 2, 1,
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&ff_h263_mbtype_b_tab[0][0], 2, 1, 0);
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VLC_INIT_STATIC_TABLE(cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
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&ff_cbpc_b_tab[0][1], 2, 1,
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&ff_cbpc_b_tab[0][0], 2, 1, 0);
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2022-02-11 20:27:55 +02:00
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}
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av_cold void ff_h263_decode_init_vlc(void)
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{
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static AVOnce init_static_once = AV_ONCE_INIT;
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ff_thread_once(&init_static_once, h263_decode_init_vlc);
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2010-01-09 16:59:06 +02:00
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}
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int ff_h263_decode_mba(MpegEncContext *s)
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{
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int i, mb_pos;
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2015-06-26 15:57:15 +02:00
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for (i = 0; i < 6; i++)
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if (s->mb_num - 1 <= ff_mba_max[i])
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break;
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mb_pos = get_bits(&s->gb, ff_mba_length[i]);
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s->mb_x = mb_pos % s->mb_width;
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s->mb_y = mb_pos / s->mb_width;
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2010-01-09 16:59:06 +02:00
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return mb_pos;
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}
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/**
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2011-12-07 15:03:53 +03:00
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* Decode the group of blocks header or slice header.
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2010-01-09 16:59:06 +02:00
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* @return <0 if an error occurred
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*/
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static int h263_decode_gob_header(MpegEncContext *s)
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{
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2011-06-01 19:26:27 +03:00
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unsigned int val, gob_number;
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2010-01-09 16:59:06 +02:00
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int left;
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/* Check for GOB Start Code */
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val = show_bits(&s->gb, 16);
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if(val)
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return -1;
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/* We have a GBSC probably with GSTUFF */
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skip_bits(&s->gb, 16); /* Drop the zeros */
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left= get_bits_left(&s->gb);
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2016-11-15 19:05:33 +02:00
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left = FFMIN(left, 32);
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2016-03-29 00:07:47 +02:00
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//MN: we must check the bits left or we might end in an infinite loop (or segfault)
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2010-01-09 16:59:06 +02:00
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for(;left>13; left--){
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if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
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}
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if(left<=13)
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return -1;
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if(s->h263_slice_structured){
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2016-06-22 20:07:46 +02:00
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if(check_marker(s->avctx, &s->gb, "before MBA")==0)
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2010-01-09 16:59:06 +02:00
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return -1;
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ff_h263_decode_mba(s);
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if(s->mb_num > 1583)
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2016-06-22 20:07:46 +02:00
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if(check_marker(s->avctx, &s->gb, "after MBA")==0)
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2010-01-09 16:59:06 +02:00
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return -1;
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s->qscale = get_bits(&s->gb, 5); /* SQUANT */
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2016-06-22 20:07:46 +02:00
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if(check_marker(s->avctx, &s->gb, "after SQUANT")==0)
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2010-01-09 16:59:06 +02:00
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return -1;
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2011-06-01 19:26:27 +03:00
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skip_bits(&s->gb, 2); /* GFID */
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2010-01-09 16:59:06 +02:00
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}else{
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gob_number = get_bits(&s->gb, 5); /* GN */
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s->mb_x= 0;
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s->mb_y= s->gob_index* gob_number;
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2011-06-01 19:26:27 +03:00
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skip_bits(&s->gb, 2); /* GFID */
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2010-01-09 16:59:06 +02:00
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s->qscale = get_bits(&s->gb, 5); /* GQUANT */
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}
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if(s->mb_y >= s->mb_height)
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return -1;
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if(s->qscale==0)
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return -1;
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return 0;
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}
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/**
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2017-12-29 17:42:14 +02:00
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* Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
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2010-01-09 16:59:06 +02:00
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* @return bit position of the resync_marker, or <0 if none was found
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*/
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int ff_h263_resync(MpegEncContext *s){
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int left, pos, ret;
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2017-12-29 17:42:14 +02:00
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/* In MPEG-4 studio mode look for a new slice startcode
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* and decode slice header */
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if(s->codec_id==AV_CODEC_ID_MPEG4 && s->studio_profile) {
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align_get_bits(&s->gb);
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2021-09-12 19:02:18 +02:00
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while (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) != SLICE_STARTCODE) {
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2017-12-29 17:42:14 +02:00
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get_bits(&s->gb, 8);
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}
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2021-09-12 19:02:18 +02:00
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if (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) == SLICE_STARTCODE)
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2017-12-29 17:42:14 +02:00
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return get_bits_count(&s->gb);
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else
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return -1;
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}
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2012-08-05 12:11:04 +03:00
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if(s->codec_id==AV_CODEC_ID_MPEG4){
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2010-01-09 16:59:06 +02:00
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skip_bits1(&s->gb);
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align_get_bits(&s->gb);
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}
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if(show_bits(&s->gb, 16)==0){
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pos= get_bits_count(&s->gb);
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2012-08-05 12:11:04 +03:00
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if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
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2013-11-26 13:23:16 +03:00
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ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
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2010-01-09 16:59:06 +02:00
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else
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ret= h263_decode_gob_header(s);
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if(ret>=0)
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return pos;
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}
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//OK, it's not where it is supposed to be ...
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s->gb= s->last_resync_gb;
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align_get_bits(&s->gb);
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left= get_bits_left(&s->gb);
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for(;left>16+1+5+5; left-=8){
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if(show_bits(&s->gb, 16)==0){
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GetBitContext bak= s->gb;
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pos= get_bits_count(&s->gb);
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2012-08-05 12:11:04 +03:00
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if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
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2013-11-26 13:23:16 +03:00
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ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
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2010-01-09 16:59:06 +02:00
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else
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ret= h263_decode_gob_header(s);
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if(ret>=0)
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return pos;
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s->gb= bak;
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}
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skip_bits(&s->gb, 8);
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}
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return -1;
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}
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2012-02-09 12:28:46 +03:00
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int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
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2010-01-09 16:59:06 +02:00
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{
|
2011-10-10 01:16:07 +03:00
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int code, val, sign, shift;
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2023-09-20 19:30:32 +02:00
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code = get_vlc2(&s->gb, ff_h263_mv_vlc, H263_MV_VLC_BITS, 2);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if (code == 0)
|
|
|
|
return pred;
|
|
|
|
if (code < 0)
|
|
|
|
return 0xffff;
|
|
|
|
|
|
|
|
sign = get_bits1(&s->gb);
|
|
|
|
shift = f_code - 1;
|
|
|
|
val = code;
|
|
|
|
if (shift) {
|
|
|
|
val = (val - 1) << shift;
|
|
|
|
val |= get_bits(&s->gb, shift);
|
|
|
|
val++;
|
|
|
|
}
|
|
|
|
if (sign)
|
|
|
|
val = -val;
|
|
|
|
val += pred;
|
|
|
|
|
|
|
|
/* modulo decoding */
|
|
|
|
if (!s->h263_long_vectors) {
|
2011-10-10 01:16:07 +03:00
|
|
|
val = sign_extend(val, 5 + f_code);
|
2010-01-09 16:59:06 +02:00
|
|
|
} else {
|
2016-04-27 19:45:23 +02:00
|
|
|
/* horrible H.263 long vector mode */
|
2010-01-09 16:59:06 +02:00
|
|
|
if (pred < -31 && val < -63)
|
|
|
|
val += 64;
|
|
|
|
if (pred > 32 && val > 63)
|
|
|
|
val -= 64;
|
|
|
|
|
|
|
|
}
|
|
|
|
return val;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2011-12-07 15:03:53 +03:00
|
|
|
/* Decode RVLC of H.263+ UMV */
|
2010-01-09 16:59:06 +02:00
|
|
|
static int h263p_decode_umotion(MpegEncContext * s, int pred)
|
|
|
|
{
|
|
|
|
int code = 0, sign;
|
|
|
|
|
|
|
|
if (get_bits1(&s->gb)) /* Motion difference = 0 */
|
|
|
|
return pred;
|
|
|
|
|
|
|
|
code = 2 + get_bits1(&s->gb);
|
|
|
|
|
|
|
|
while (get_bits1(&s->gb))
|
|
|
|
{
|
|
|
|
code <<= 1;
|
|
|
|
code += get_bits1(&s->gb);
|
2017-02-24 00:46:30 +02:00
|
|
|
if (code >= 32768) {
|
|
|
|
avpriv_request_sample(s->avctx, "Huge DMV");
|
2017-02-28 23:07:37 +02:00
|
|
|
return 0xffff;
|
2017-02-24 00:46:30 +02:00
|
|
|
}
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
sign = code & 1;
|
|
|
|
code >>= 1;
|
|
|
|
|
|
|
|
code = (sign) ? (pred - code) : (pred + code);
|
2015-04-26 01:00:05 +02:00
|
|
|
ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
|
2010-01-09 16:59:06 +02:00
|
|
|
return code;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2016-03-29 00:07:47 +02:00
|
|
|
* read the next MVs for OBMC. yes this is an ugly hack, feel free to send a patch :)
|
2010-01-09 16:59:06 +02:00
|
|
|
*/
|
|
|
|
static void preview_obmc(MpegEncContext *s){
|
|
|
|
GetBitContext gb= s->gb;
|
|
|
|
|
|
|
|
int cbpc, i, pred_x, pred_y, mx, my;
|
|
|
|
int16_t *mot_val;
|
|
|
|
const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
|
|
|
|
const int stride= s->b8_stride*2;
|
|
|
|
|
|
|
|
for(i=0; i<4; i++)
|
|
|
|
s->block_index[i]+= 2;
|
|
|
|
for(i=4; i<6; i++)
|
|
|
|
s->block_index[i]+= 1;
|
|
|
|
s->mb_x++;
|
|
|
|
|
2012-07-01 19:04:08 +03:00
|
|
|
av_assert2(s->pict_type == AV_PICTURE_TYPE_P);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
do{
|
|
|
|
if (get_bits1(&s->gb)) {
|
|
|
|
/* skip mb */
|
2012-11-21 23:34:46 +03:00
|
|
|
mot_val = s->current_picture.motion_val[0][s->block_index[0]];
|
2010-01-09 16:59:06 +02:00
|
|
|
mot_val[0 ]= mot_val[2 ]=
|
|
|
|
mot_val[0+stride]= mot_val[2+stride]= 0;
|
|
|
|
mot_val[1 ]= mot_val[3 ]=
|
|
|
|
mot_val[1+stride]= mot_val[3+stride]= 0;
|
|
|
|
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
|
2010-01-09 16:59:06 +02:00
|
|
|
goto end;
|
|
|
|
}
|
2023-09-20 19:30:32 +02:00
|
|
|
cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 2);
|
2010-01-09 16:59:06 +02:00
|
|
|
}while(cbpc == 20);
|
|
|
|
|
|
|
|
if(cbpc & 4){
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
|
2010-01-09 16:59:06 +02:00
|
|
|
}else{
|
2023-09-20 19:30:32 +02:00
|
|
|
get_vlc2(&s->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (cbpc & 8) {
|
|
|
|
if(s->modified_quant){
|
|
|
|
if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
|
|
|
|
else skip_bits(&s->gb, 5);
|
|
|
|
}else
|
|
|
|
skip_bits(&s->gb, 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((cbpc & 16) == 0) {
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
|
2010-01-09 16:59:06 +02:00
|
|
|
/* 16x16 motion prediction */
|
2012-02-09 12:28:46 +03:00
|
|
|
mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (s->umvplus)
|
2017-02-01 18:38:43 +02:00
|
|
|
mx = h263p_decode_umotion(s, pred_x);
|
2010-01-09 16:59:06 +02:00
|
|
|
else
|
2017-02-01 18:38:43 +02:00
|
|
|
mx = ff_h263_decode_motion(s, pred_x, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if (s->umvplus)
|
2017-02-01 18:38:43 +02:00
|
|
|
my = h263p_decode_umotion(s, pred_y);
|
2010-01-09 16:59:06 +02:00
|
|
|
else
|
2017-02-01 18:38:43 +02:00
|
|
|
my = ff_h263_decode_motion(s, pred_y, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
mot_val[0 ]= mot_val[2 ]=
|
|
|
|
mot_val[0+stride]= mot_val[2+stride]= mx;
|
|
|
|
mot_val[1 ]= mot_val[3 ]=
|
|
|
|
mot_val[1+stride]= mot_val[3+stride]= my;
|
|
|
|
} else {
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
|
2010-01-09 16:59:06 +02:00
|
|
|
for(i=0;i<4;i++) {
|
2012-02-09 12:28:46 +03:00
|
|
|
mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (s->umvplus)
|
2017-02-01 18:38:43 +02:00
|
|
|
mx = h263p_decode_umotion(s, pred_x);
|
2010-01-09 16:59:06 +02:00
|
|
|
else
|
2017-02-01 18:38:43 +02:00
|
|
|
mx = ff_h263_decode_motion(s, pred_x, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if (s->umvplus)
|
2017-02-01 18:38:43 +02:00
|
|
|
my = h263p_decode_umotion(s, pred_y);
|
2010-01-09 16:59:06 +02:00
|
|
|
else
|
2017-02-01 18:38:43 +02:00
|
|
|
my = ff_h263_decode_motion(s, pred_y, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
|
2017-02-01 18:38:43 +02:00
|
|
|
skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
|
2010-01-09 16:59:06 +02:00
|
|
|
mot_val[0] = mx;
|
|
|
|
mot_val[1] = my;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
end:
|
|
|
|
|
|
|
|
for(i=0; i<4; i++)
|
|
|
|
s->block_index[i]-= 2;
|
|
|
|
for(i=4; i<6; i++)
|
|
|
|
s->block_index[i]-= 1;
|
|
|
|
s->mb_x--;
|
|
|
|
|
|
|
|
s->gb= gb;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void h263_decode_dquant(MpegEncContext *s){
|
|
|
|
static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
|
|
|
|
|
|
|
|
if(s->modified_quant){
|
|
|
|
if(get_bits1(&s->gb))
|
2012-02-09 12:28:46 +03:00
|
|
|
s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];
|
2010-01-09 16:59:06 +02:00
|
|
|
else
|
|
|
|
s->qscale= get_bits(&s->gb, 5);
|
|
|
|
}else
|
|
|
|
s->qscale += quant_tab[get_bits(&s->gb, 2)];
|
|
|
|
ff_set_qscale(s, s->qscale);
|
|
|
|
}
|
|
|
|
|
2021-05-07 22:30:53 +02:00
|
|
|
static void h263_pred_acdc(MpegEncContext * s, int16_t *block, int n)
|
|
|
|
{
|
|
|
|
int x, y, wrap, a, c, pred_dc, scale;
|
|
|
|
int16_t *dc_val, *ac_val, *ac_val1;
|
|
|
|
|
|
|
|
/* find prediction */
|
|
|
|
if (n < 4) {
|
|
|
|
x = 2 * s->mb_x + (n & 1);
|
|
|
|
y = 2 * s->mb_y + (n>> 1);
|
|
|
|
wrap = s->b8_stride;
|
|
|
|
dc_val = s->dc_val[0];
|
|
|
|
ac_val = s->ac_val[0][0];
|
|
|
|
scale = s->y_dc_scale;
|
|
|
|
} else {
|
|
|
|
x = s->mb_x;
|
|
|
|
y = s->mb_y;
|
|
|
|
wrap = s->mb_stride;
|
|
|
|
dc_val = s->dc_val[n - 4 + 1];
|
|
|
|
ac_val = s->ac_val[n - 4 + 1][0];
|
|
|
|
scale = s->c_dc_scale;
|
|
|
|
}
|
|
|
|
|
|
|
|
ac_val += ((y) * wrap + (x)) * 16;
|
|
|
|
ac_val1 = ac_val;
|
|
|
|
|
|
|
|
/* B C
|
|
|
|
* A X
|
|
|
|
*/
|
|
|
|
a = dc_val[(x - 1) + (y) * wrap];
|
|
|
|
c = dc_val[(x) + (y - 1) * wrap];
|
|
|
|
|
|
|
|
/* No prediction outside GOB boundary */
|
|
|
|
if (s->first_slice_line && n != 3) {
|
|
|
|
if (n != 2) c= 1024;
|
|
|
|
if (n != 1 && s->mb_x == s->resync_mb_x) a= 1024;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (s->ac_pred) {
|
|
|
|
pred_dc = 1024;
|
|
|
|
if (s->h263_aic_dir) {
|
|
|
|
/* left prediction */
|
|
|
|
if (a != 1024) {
|
|
|
|
ac_val -= 16;
|
|
|
|
for (int i = 1; i < 8; i++) {
|
|
|
|
block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
|
|
|
|
}
|
|
|
|
pred_dc = a;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* top prediction */
|
|
|
|
if (c != 1024) {
|
|
|
|
ac_val -= 16 * wrap;
|
|
|
|
for (int i = 1; i < 8; i++) {
|
|
|
|
block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
|
|
|
|
}
|
|
|
|
pred_dc = c;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* just DC prediction */
|
|
|
|
if (a != 1024 && c != 1024)
|
|
|
|
pred_dc = (a + c) >> 1;
|
|
|
|
else if (a != 1024)
|
|
|
|
pred_dc = a;
|
|
|
|
else
|
|
|
|
pred_dc = c;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* we assume pred is positive */
|
|
|
|
block[0] = block[0] * scale + pred_dc;
|
|
|
|
|
|
|
|
if (block[0] < 0)
|
|
|
|
block[0] = 0;
|
|
|
|
else
|
|
|
|
block[0] |= 1;
|
|
|
|
|
|
|
|
/* Update AC/DC tables */
|
|
|
|
dc_val[(x) + (y) * wrap] = block[0];
|
|
|
|
|
|
|
|
/* left copy */
|
|
|
|
for (int i = 1; i < 8; i++)
|
|
|
|
ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
|
|
|
|
/* top copy */
|
|
|
|
for (int i = 1; i < 8; i++)
|
|
|
|
ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
|
|
|
|
}
|
|
|
|
|
2013-01-20 03:02:29 +03:00
|
|
|
static int h263_decode_block(MpegEncContext * s, int16_t * block,
|
2010-01-09 16:59:06 +02:00
|
|
|
int n, int coded)
|
|
|
|
{
|
2014-08-31 16:41:36 +03:00
|
|
|
int level, i, j, run;
|
2010-01-09 16:59:06 +02:00
|
|
|
RLTable *rl = &ff_h263_rl_inter;
|
|
|
|
const uint8_t *scan_table;
|
|
|
|
GetBitContext gb= s->gb;
|
|
|
|
|
|
|
|
scan_table = s->intra_scantable.permutated;
|
|
|
|
if (s->h263_aic && s->mb_intra) {
|
2012-02-09 12:28:46 +03:00
|
|
|
rl = &ff_rl_intra_aic;
|
2010-01-09 16:59:06 +02:00
|
|
|
i = 0;
|
|
|
|
if (s->ac_pred) {
|
|
|
|
if (s->h263_aic_dir)
|
2022-10-20 19:03:01 +02:00
|
|
|
scan_table = s->permutated_intra_v_scantable; /* left */
|
2010-01-09 16:59:06 +02:00
|
|
|
else
|
2022-10-20 19:03:01 +02:00
|
|
|
scan_table = s->permutated_intra_h_scantable; /* top */
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
} else if (s->mb_intra) {
|
|
|
|
/* DC coef */
|
2015-01-28 17:42:50 +02:00
|
|
|
if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {
|
2011-04-28 02:40:44 +03:00
|
|
|
if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
|
2010-01-09 16:59:06 +02:00
|
|
|
int component, diff;
|
|
|
|
component = (n <= 3 ? 0 : n - 4 + 1);
|
|
|
|
level = s->last_dc[component];
|
|
|
|
if (s->rv10_first_dc_coded[component]) {
|
2012-02-15 14:54:05 +03:00
|
|
|
diff = ff_rv_decode_dc(s, n);
|
2020-10-28 10:12:08 +02:00
|
|
|
if (diff < 0)
|
2010-01-09 16:59:06 +02:00
|
|
|
return -1;
|
|
|
|
level += diff;
|
|
|
|
level = level & 0xff; /* handle wrap round */
|
|
|
|
s->last_dc[component] = level;
|
|
|
|
} else {
|
|
|
|
s->rv10_first_dc_coded[component] = 1;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
level = get_bits(&s->gb, 8);
|
|
|
|
if (level == 255)
|
|
|
|
level = 128;
|
|
|
|
}
|
|
|
|
}else{
|
|
|
|
level = get_bits(&s->gb, 8);
|
|
|
|
if((level&0x7F) == 0){
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
|
2015-05-22 20:38:07 +02:00
|
|
|
if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
|
2010-01-09 16:59:06 +02:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (level == 255)
|
|
|
|
level = 128;
|
|
|
|
}
|
|
|
|
block[0] = level;
|
|
|
|
i = 1;
|
|
|
|
} else {
|
|
|
|
i = 0;
|
|
|
|
}
|
|
|
|
if (!coded) {
|
|
|
|
if (s->mb_intra && s->h263_aic)
|
|
|
|
goto not_coded;
|
|
|
|
s->block_last_index[n] = i - 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
retry:
|
2014-08-31 15:20:23 +03:00
|
|
|
{
|
|
|
|
OPEN_READER(re, &s->gb);
|
2014-08-31 21:30:04 +03:00
|
|
|
i--; // offset by -1 to allow direct indexing of scan_table
|
2010-01-09 16:59:06 +02:00
|
|
|
for(;;) {
|
2014-08-31 15:20:23 +03:00
|
|
|
UPDATE_CACHE(re, &s->gb);
|
|
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
|
|
|
|
if (run == 66) {
|
2014-09-01 00:01:09 +03:00
|
|
|
if (level){
|
|
|
|
CLOSE_READER(re, &s->gb);
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
|
|
|
|
return -1;
|
|
|
|
}
|
2010-01-09 16:59:06 +02:00
|
|
|
/* escape */
|
|
|
|
if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
|
2014-08-31 15:20:23 +03:00
|
|
|
int is11 = SHOW_UBITS(re, &s->gb, 1);
|
|
|
|
SKIP_CACHE(re, &s->gb, 1);
|
2014-08-31 16:41:36 +03:00
|
|
|
run = SHOW_UBITS(re, &s->gb, 7) + 1;
|
2014-08-31 15:20:23 +03:00
|
|
|
if (is11) {
|
2014-08-31 16:41:36 +03:00
|
|
|
SKIP_COUNTER(re, &s->gb, 1 + 7);
|
2014-08-31 15:20:23 +03:00
|
|
|
UPDATE_CACHE(re, &s->gb);
|
|
|
|
level = SHOW_SBITS(re, &s->gb, 11);
|
2014-08-31 16:41:36 +03:00
|
|
|
SKIP_COUNTER(re, &s->gb, 11);
|
2014-08-31 15:20:23 +03:00
|
|
|
} else {
|
2014-08-31 16:41:36 +03:00
|
|
|
SKIP_CACHE(re, &s->gb, 7);
|
2014-08-31 15:20:23 +03:00
|
|
|
level = SHOW_SBITS(re, &s->gb, 7);
|
2014-08-31 16:41:36 +03:00
|
|
|
SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);
|
2014-08-31 15:20:23 +03:00
|
|
|
}
|
2010-01-09 16:59:06 +02:00
|
|
|
} else {
|
2014-08-31 16:41:36 +03:00
|
|
|
run = SHOW_UBITS(re, &s->gb, 7) + 1;
|
|
|
|
SKIP_CACHE(re, &s->gb, 7);
|
2014-08-31 15:20:23 +03:00
|
|
|
level = (int8_t)SHOW_UBITS(re, &s->gb, 8);
|
2014-08-31 16:41:36 +03:00
|
|
|
SKIP_COUNTER(re, &s->gb, 7 + 8);
|
2010-01-09 16:59:06 +02:00
|
|
|
if(level == -128){
|
2014-08-31 15:20:23 +03:00
|
|
|
UPDATE_CACHE(re, &s->gb);
|
2012-08-05 12:11:04 +03:00
|
|
|
if (s->codec_id == AV_CODEC_ID_RV10) {
|
2010-01-09 16:59:06 +02:00
|
|
|
/* XXX: should patch encoder too */
|
2014-08-31 15:20:23 +03:00
|
|
|
level = SHOW_SBITS(re, &s->gb, 12);
|
|
|
|
SKIP_COUNTER(re, &s->gb, 12);
|
2010-01-09 16:59:06 +02:00
|
|
|
}else{
|
2014-08-31 15:20:23 +03:00
|
|
|
level = SHOW_UBITS(re, &s->gb, 5);
|
|
|
|
SKIP_CACHE(re, &s->gb, 5);
|
2017-02-21 18:32:56 +02:00
|
|
|
level |= SHOW_SBITS(re, &s->gb, 6) * (1<<5);
|
2014-08-31 15:20:23 +03:00
|
|
|
SKIP_COUNTER(re, &s->gb, 5 + 6);
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
2014-08-31 15:20:23 +03:00
|
|
|
if (SHOW_UBITS(re, &s->gb, 1))
|
2010-01-09 16:59:06 +02:00
|
|
|
level = -level;
|
2014-08-31 15:20:23 +03:00
|
|
|
SKIP_COUNTER(re, &s->gb, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
i += run;
|
2014-08-31 21:30:04 +03:00
|
|
|
if (i >= 64){
|
2014-08-31 22:39:22 +03:00
|
|
|
CLOSE_READER(re, &s->gb);
|
2014-08-31 21:30:04 +03:00
|
|
|
// redo update without last flag, revert -1 offset
|
|
|
|
i = i - run + ((run-1)&63) + 1;
|
2014-08-31 16:41:36 +03:00
|
|
|
if (i < 64) {
|
|
|
|
// only last marker, no overrun
|
|
|
|
block[scan_table[i]] = level;
|
|
|
|
break;
|
|
|
|
}
|
2010-01-09 16:59:06 +02:00
|
|
|
if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
|
|
|
|
//Looks like a hack but no, it's the way it is supposed to work ...
|
2012-02-09 12:28:46 +03:00
|
|
|
rl = &ff_rl_intra_aic;
|
2010-01-09 16:59:06 +02:00
|
|
|
i = 0;
|
|
|
|
s->gb= gb;
|
2014-01-14 12:33:47 +03:00
|
|
|
s->bdsp.clear_block(block);
|
2010-01-09 16:59:06 +02:00
|
|
|
goto retry;
|
|
|
|
}
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
|
|
|
|
return -1;
|
|
|
|
}
|
2014-08-31 21:30:04 +03:00
|
|
|
j = scan_table[i];
|
2010-01-09 16:59:06 +02:00
|
|
|
block[j] = level;
|
|
|
|
}
|
2014-08-31 15:20:23 +03:00
|
|
|
}
|
2010-01-09 16:59:06 +02:00
|
|
|
not_coded:
|
|
|
|
if (s->mb_intra && s->h263_aic) {
|
2021-05-07 22:30:53 +02:00
|
|
|
h263_pred_acdc(s, block, n);
|
2010-01-09 16:59:06 +02:00
|
|
|
i = 63;
|
|
|
|
}
|
|
|
|
s->block_last_index[n] = i;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int h263_skip_b_part(MpegEncContext *s, int cbp)
|
|
|
|
{
|
2017-10-02 01:29:32 +02:00
|
|
|
LOCAL_ALIGNED_32(int16_t, dblock, [64]);
|
2010-01-09 16:59:06 +02:00
|
|
|
int i, mbi;
|
2012-12-11 01:20:47 +03:00
|
|
|
int bli[6];
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
/* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
|
|
|
|
* but real value should be restored in order to be used later (in OBMC condition)
|
|
|
|
*/
|
|
|
|
mbi = s->mb_intra;
|
2012-12-11 01:20:47 +03:00
|
|
|
memcpy(bli, s->block_last_index, sizeof(bli));
|
2010-01-09 16:59:06 +02:00
|
|
|
s->mb_intra = 0;
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
|
|
if (h263_decode_block(s, dblock, i, cbp&32) < 0)
|
|
|
|
return -1;
|
|
|
|
cbp+=cbp;
|
|
|
|
}
|
|
|
|
s->mb_intra = mbi;
|
2012-12-11 01:20:47 +03:00
|
|
|
memcpy(s->block_last_index, bli, sizeof(bli));
|
2010-01-09 16:59:06 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
|
|
|
|
{
|
|
|
|
int c, mv = 1;
|
|
|
|
|
|
|
|
if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
|
|
|
|
c = get_bits1(gb);
|
|
|
|
if (pb_frame == 2 && c)
|
|
|
|
mv = !get_bits1(gb);
|
|
|
|
} else { // h.263 Annex M improved PB-frame
|
|
|
|
mv = get_unary(gb, 0, 4) + 1;
|
|
|
|
c = mv & 1;
|
|
|
|
mv = !!(mv & 2);
|
|
|
|
}
|
|
|
|
if(c)
|
|
|
|
*cbpb = get_bits(gb, 6);
|
|
|
|
return mv;
|
|
|
|
}
|
|
|
|
|
2017-02-03 03:50:01 +02:00
|
|
|
#define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
|
|
|
|
#define tab_bias (tab_size / 2)
|
|
|
|
static inline void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
|
|
|
|
{
|
|
|
|
int xy = s->block_index[i];
|
|
|
|
uint16_t time_pp = s->pp_time;
|
|
|
|
uint16_t time_pb = s->pb_time;
|
|
|
|
int p_mx, p_my;
|
|
|
|
|
|
|
|
p_mx = p->motion_val[0][xy][0];
|
|
|
|
if ((unsigned)(p_mx + tab_bias) < tab_size) {
|
|
|
|
s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias];
|
|
|
|
s->mv[1][i][0] = s->direct_scale_mv[1][p_mx + tab_bias];
|
|
|
|
} else {
|
|
|
|
s->mv[0][i][0] = p_mx * time_pb / time_pp;
|
|
|
|
s->mv[1][i][0] = p_mx * (time_pb - time_pp) / time_pp;
|
|
|
|
}
|
|
|
|
p_my = p->motion_val[0][xy][1];
|
|
|
|
if ((unsigned)(p_my + tab_bias) < tab_size) {
|
|
|
|
s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias];
|
|
|
|
s->mv[1][i][1] = s->direct_scale_mv[1][p_my + tab_bias];
|
|
|
|
} else {
|
|
|
|
s->mv[0][i][1] = p_my * time_pb / time_pp;
|
|
|
|
s->mv[1][i][1] = p_my * (time_pb - time_pp) / time_pp;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @return the mb_type
|
|
|
|
*/
|
|
|
|
static int set_direct_mv(MpegEncContext *s)
|
|
|
|
{
|
|
|
|
const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
|
|
|
|
Picture *p = &s->next_picture;
|
|
|
|
int colocated_mb_type = p->mb_type[mb_index];
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (s->codec_tag == AV_RL32("U263") && p->f->pict_type == AV_PICTURE_TYPE_I) {
|
|
|
|
p = &s->last_picture;
|
|
|
|
colocated_mb_type = p->mb_type[mb_index];
|
|
|
|
}
|
|
|
|
|
|
|
|
if (IS_8X8(colocated_mb_type)) {
|
|
|
|
s->mv_type = MV_TYPE_8X8;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
|
|
set_one_direct_mv(s, p, i);
|
|
|
|
return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
|
|
|
|
} else {
|
|
|
|
set_one_direct_mv(s, p, 0);
|
|
|
|
s->mv[0][1][0] =
|
|
|
|
s->mv[0][2][0] =
|
|
|
|
s->mv[0][3][0] = s->mv[0][0][0];
|
|
|
|
s->mv[0][1][1] =
|
|
|
|
s->mv[0][2][1] =
|
|
|
|
s->mv[0][3][1] = s->mv[0][0][1];
|
|
|
|
s->mv[1][1][0] =
|
|
|
|
s->mv[1][2][0] =
|
|
|
|
s->mv[1][3][0] = s->mv[1][0][0];
|
|
|
|
s->mv[1][1][1] =
|
|
|
|
s->mv[1][2][1] =
|
|
|
|
s->mv[1][3][1] = s->mv[1][0][1];
|
|
|
|
s->mv_type = MV_TYPE_8X8;
|
|
|
|
// Note see prev line
|
|
|
|
return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2010-01-09 16:59:06 +02:00
|
|
|
int ff_h263_decode_mb(MpegEncContext *s,
|
2013-01-20 03:02:29 +03:00
|
|
|
int16_t block[6][64])
|
2010-01-09 16:59:06 +02:00
|
|
|
{
|
|
|
|
int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
|
|
|
|
int16_t *mot_val;
|
|
|
|
const int xy= s->mb_x + s->mb_y * s->mb_stride;
|
|
|
|
int cbpb = 0, pb_mv_count = 0;
|
|
|
|
|
2012-06-22 22:50:50 +03:00
|
|
|
av_assert2(!s->h263_pred);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
2011-04-28 02:40:44 +03:00
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_P) {
|
2010-01-09 16:59:06 +02:00
|
|
|
do{
|
|
|
|
if (get_bits1(&s->gb)) {
|
|
|
|
/* skip mb */
|
|
|
|
s->mb_intra = 0;
|
|
|
|
for(i=0;i<6;i++)
|
|
|
|
s->block_last_index[i] = -1;
|
|
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
|
|
s->mv_type = MV_TYPE_16X16;
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
|
2010-01-09 16:59:06 +02:00
|
|
|
s->mv[0][0][0] = 0;
|
|
|
|
s->mv[0][0][1] = 0;
|
|
|
|
s->mb_skipped = !(s->obmc | s->loop_filter);
|
|
|
|
goto end;
|
|
|
|
}
|
2023-09-20 19:30:32 +02:00
|
|
|
cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 2);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (cbpc < 0){
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
}while(cbpc == 20);
|
|
|
|
|
2014-01-14 12:33:47 +03:00
|
|
|
s->bdsp.clear_blocks(s->block[0]);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
dquant = cbpc & 8;
|
|
|
|
s->mb_intra = ((cbpc & 4) != 0);
|
|
|
|
if (s->mb_intra) goto intra;
|
|
|
|
|
|
|
|
if(s->pb_frame && get_bits1(&s->gb))
|
|
|
|
pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
|
2023-09-20 19:30:32 +02:00
|
|
|
cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
2017-02-20 01:49:03 +02:00
|
|
|
if (cbpy < 0) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
|
|
return SLICE_ERROR;
|
|
|
|
}
|
|
|
|
|
2010-01-09 16:59:06 +02:00
|
|
|
if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
|
|
|
|
cbpy ^= 0xF;
|
|
|
|
|
|
|
|
cbp = (cbpc & 3) | (cbpy << 2);
|
|
|
|
if (dquant) {
|
|
|
|
h263_decode_dquant(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
|
|
if ((cbpc & 16) == 0) {
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
|
2010-01-09 16:59:06 +02:00
|
|
|
/* 16x16 motion prediction */
|
|
|
|
s->mv_type = MV_TYPE_16X16;
|
2012-02-09 12:28:46 +03:00
|
|
|
ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (s->umvplus)
|
|
|
|
mx = h263p_decode_umotion(s, pred_x);
|
|
|
|
else
|
2012-02-09 12:28:46 +03:00
|
|
|
mx = ff_h263_decode_motion(s, pred_x, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if (mx >= 0xffff)
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if (s->umvplus)
|
|
|
|
my = h263p_decode_umotion(s, pred_y);
|
|
|
|
else
|
2012-02-09 12:28:46 +03:00
|
|
|
my = ff_h263_decode_motion(s, pred_y, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if (my >= 0xffff)
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2010-01-09 16:59:06 +02:00
|
|
|
s->mv[0][0][0] = mx;
|
|
|
|
s->mv[0][0][1] = my;
|
|
|
|
|
|
|
|
if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
|
|
|
|
skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
|
|
|
|
} else {
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
|
2010-01-09 16:59:06 +02:00
|
|
|
s->mv_type = MV_TYPE_8X8;
|
|
|
|
for(i=0;i<4;i++) {
|
2012-02-09 12:28:46 +03:00
|
|
|
mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (s->umvplus)
|
2017-02-01 18:38:43 +02:00
|
|
|
mx = h263p_decode_umotion(s, pred_x);
|
2010-01-09 16:59:06 +02:00
|
|
|
else
|
2017-02-01 18:38:43 +02:00
|
|
|
mx = ff_h263_decode_motion(s, pred_x, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (mx >= 0xffff)
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if (s->umvplus)
|
2017-02-01 18:38:43 +02:00
|
|
|
my = h263p_decode_umotion(s, pred_y);
|
2010-01-09 16:59:06 +02:00
|
|
|
else
|
2017-02-01 18:38:43 +02:00
|
|
|
my = ff_h263_decode_motion(s, pred_y, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (my >= 0xffff)
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2010-01-09 16:59:06 +02:00
|
|
|
s->mv[0][i][0] = mx;
|
|
|
|
s->mv[0][i][1] = my;
|
|
|
|
if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
|
|
|
|
skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
|
|
|
|
mot_val[0] = mx;
|
|
|
|
mot_val[1] = my;
|
|
|
|
}
|
|
|
|
}
|
2011-04-28 02:40:44 +03:00
|
|
|
} else if(s->pict_type==AV_PICTURE_TYPE_B) {
|
2010-01-09 16:59:06 +02:00
|
|
|
int mb_type;
|
|
|
|
const int stride= s->b8_stride;
|
2012-11-21 23:34:46 +03:00
|
|
|
int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
|
|
|
|
int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
|
2010-01-09 16:59:06 +02:00
|
|
|
// const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
|
|
|
|
|
|
|
|
//FIXME ugly
|
|
|
|
mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
|
|
|
|
mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
|
|
|
|
mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
|
|
|
|
mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
|
|
|
|
|
|
|
|
do{
|
2023-09-20 19:30:32 +02:00
|
|
|
mb_type = get_vlc2(&s->gb, h263_mbtype_b_vlc,
|
|
|
|
H263_MBTYPE_B_VLC_BITS, 2);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (mb_type < 0){
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
mb_type= h263_mb_type_b_map[ mb_type ];
|
|
|
|
}while(!mb_type);
|
|
|
|
|
|
|
|
s->mb_intra = IS_INTRA(mb_type);
|
|
|
|
if(HAS_CBP(mb_type)){
|
2014-01-14 12:33:47 +03:00
|
|
|
s->bdsp.clear_blocks(s->block[0]);
|
2023-09-20 19:30:32 +02:00
|
|
|
cbpc = get_vlc2(&s->gb, cbpc_b_vlc, CBPC_B_VLC_BITS, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
if(s->mb_intra){
|
|
|
|
dquant = IS_QUANT(mb_type);
|
|
|
|
goto intra;
|
|
|
|
}
|
|
|
|
|
2023-09-20 19:30:32 +02:00
|
|
|
cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if (cbpy < 0){
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
|
|
|
|
cbpy ^= 0xF;
|
|
|
|
|
|
|
|
cbp = (cbpc & 3) | (cbpy << 2);
|
|
|
|
}else
|
|
|
|
cbp=0;
|
|
|
|
|
2012-06-22 22:50:50 +03:00
|
|
|
av_assert2(!s->mb_intra);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if(IS_QUANT(mb_type)){
|
|
|
|
h263_decode_dquant(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
if(IS_DIRECT(mb_type)){
|
|
|
|
s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
|
2017-02-03 03:50:01 +02:00
|
|
|
mb_type |= set_direct_mv(s);
|
2010-01-09 16:59:06 +02:00
|
|
|
}else{
|
|
|
|
s->mv_dir = 0;
|
|
|
|
s->mv_type= MV_TYPE_16X16;
|
|
|
|
//FIXME UMV
|
|
|
|
|
|
|
|
if(USES_LIST(mb_type, 0)){
|
2017-02-01 18:04:52 +02:00
|
|
|
int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
|
2010-01-09 16:59:06 +02:00
|
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
|
|
|
2017-02-01 18:04:52 +02:00
|
|
|
if (s->umvplus)
|
|
|
|
mx = h263p_decode_umotion(s, pred_x);
|
|
|
|
else
|
|
|
|
mx = ff_h263_decode_motion(s, pred_x, 1);
|
|
|
|
if (mx >= 0xffff)
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2017-02-01 18:04:52 +02:00
|
|
|
|
|
|
|
if (s->umvplus)
|
|
|
|
my = h263p_decode_umotion(s, pred_y);
|
|
|
|
else
|
|
|
|
my = ff_h263_decode_motion(s, pred_y, 1);
|
|
|
|
if (my >= 0xffff)
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2017-02-01 18:04:52 +02:00
|
|
|
|
|
|
|
if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
|
|
|
|
skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
s->mv[0][0][0] = mx;
|
|
|
|
s->mv[0][0][1] = my;
|
|
|
|
mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
|
|
|
|
mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(USES_LIST(mb_type, 1)){
|
2017-02-01 18:04:52 +02:00
|
|
|
int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &pred_x, &pred_y);
|
2010-01-09 16:59:06 +02:00
|
|
|
s->mv_dir |= MV_DIR_BACKWARD;
|
|
|
|
|
2017-02-01 18:04:52 +02:00
|
|
|
if (s->umvplus)
|
|
|
|
mx = h263p_decode_umotion(s, pred_x);
|
|
|
|
else
|
|
|
|
mx = ff_h263_decode_motion(s, pred_x, 1);
|
|
|
|
if (mx >= 0xffff)
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2017-02-01 18:04:52 +02:00
|
|
|
|
|
|
|
if (s->umvplus)
|
|
|
|
my = h263p_decode_umotion(s, pred_y);
|
|
|
|
else
|
|
|
|
my = ff_h263_decode_motion(s, pred_y, 1);
|
|
|
|
if (my >= 0xffff)
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2017-02-01 18:04:52 +02:00
|
|
|
|
|
|
|
if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
|
|
|
|
skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
s->mv[1][0][0] = mx;
|
|
|
|
s->mv[1][0][1] = my;
|
|
|
|
mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
|
|
|
|
mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = mb_type;
|
2010-01-09 16:59:06 +02:00
|
|
|
} else { /* I-Frame */
|
|
|
|
do{
|
2023-09-20 19:30:32 +02:00
|
|
|
cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 2);
|
2010-01-09 16:59:06 +02:00
|
|
|
if (cbpc < 0){
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
}while(cbpc == 8);
|
|
|
|
|
2014-01-14 12:33:47 +03:00
|
|
|
s->bdsp.clear_blocks(s->block[0]);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
dquant = cbpc & 4;
|
|
|
|
s->mb_intra = 1;
|
|
|
|
intra:
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
|
2010-01-09 16:59:06 +02:00
|
|
|
if (s->h263_aic) {
|
|
|
|
s->ac_pred = get_bits1(&s->gb);
|
|
|
|
if(s->ac_pred){
|
2012-11-21 23:34:46 +03:00
|
|
|
s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
s->h263_aic_dir = get_bits1(&s->gb);
|
|
|
|
}
|
|
|
|
}else
|
|
|
|
s->ac_pred = 0;
|
|
|
|
|
|
|
|
if(s->pb_frame && get_bits1(&s->gb))
|
|
|
|
pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
|
2023-09-20 19:30:32 +02:00
|
|
|
cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
if(cbpy<0){
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
|
2017-02-01 18:42:34 +02:00
|
|
|
return SLICE_ERROR;
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
cbp = (cbpc & 3) | (cbpy << 2);
|
|
|
|
if (dquant) {
|
|
|
|
h263_decode_dquant(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
pb_mv_count += !!s->pb_frame;
|
|
|
|
}
|
|
|
|
|
|
|
|
while(pb_mv_count--){
|
2012-02-09 12:28:46 +03:00
|
|
|
ff_h263_decode_motion(s, 0, 1);
|
|
|
|
ff_h263_decode_motion(s, 0, 1);
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* decode each block */
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
|
|
if (h263_decode_block(s, block[i], i, cbp&32) < 0)
|
|
|
|
return -1;
|
|
|
|
cbp+=cbp;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
|
|
|
|
return -1;
|
|
|
|
if(s->obmc && !s->mb_intra){
|
2011-04-28 02:40:44 +03:00
|
|
|
if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
|
2010-01-09 16:59:06 +02:00
|
|
|
preview_obmc(s);
|
|
|
|
}
|
|
|
|
end:
|
|
|
|
|
2017-02-25 22:07:23 +02:00
|
|
|
if (get_bits_left(&s->gb) < 0)
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
|
2010-01-09 16:59:06 +02:00
|
|
|
/* per-MB end of slice check */
|
|
|
|
{
|
|
|
|
int v= show_bits(&s->gb, 16);
|
|
|
|
|
2012-03-05 04:53:50 +03:00
|
|
|
if (get_bits_left(&s->gb) < 16) {
|
|
|
|
v >>= 16 - get_bits_left(&s->gb);
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
if(v==0)
|
|
|
|
return SLICE_END;
|
|
|
|
}
|
|
|
|
|
|
|
|
return SLICE_OK;
|
|
|
|
}
|
|
|
|
|
2016-04-27 19:45:23 +02:00
|
|
|
/* Most is hardcoded; should extend to handle all H.263 streams. */
|
2012-02-09 12:28:46 +03:00
|
|
|
int ff_h263_decode_picture_header(MpegEncContext *s)
|
2010-01-09 16:59:06 +02:00
|
|
|
{
|
2015-06-26 15:57:16 +02:00
|
|
|
int format, width, height, i, ret;
|
2010-01-09 16:59:06 +02:00
|
|
|
uint32_t startcode;
|
|
|
|
|
|
|
|
align_get_bits(&s->gb);
|
|
|
|
|
2023-01-24 01:35:54 +02:00
|
|
|
if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_num == 0) {
|
2013-08-25 00:06:59 +03:00
|
|
|
av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
|
|
|
|
}
|
|
|
|
|
2010-01-09 16:59:06 +02:00
|
|
|
startcode= get_bits(&s->gb, 22-8);
|
|
|
|
|
|
|
|
for(i= get_bits_left(&s->gb); i>24; i-=8) {
|
|
|
|
startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
|
|
|
|
|
|
|
|
if(startcode == 0x20)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (startcode != 0x20) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
/* temporal reference */
|
|
|
|
i = get_bits(&s->gb, 8); /* picture timestamp */
|
2017-02-01 21:20:07 +02:00
|
|
|
|
|
|
|
i -= (i - (s->picture_number & 0xFF) + 128) & ~0xFF;
|
|
|
|
|
2010-01-09 16:59:06 +02:00
|
|
|
s->picture_number= (s->picture_number&~0xFF) + i;
|
|
|
|
|
|
|
|
/* PTYPE starts here */
|
2016-06-22 20:07:46 +02:00
|
|
|
if (check_marker(s->avctx, &s->gb, "in PTYPE") != 1) {
|
2010-01-09 16:59:06 +02:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (get_bits1(&s->gb) != 0) {
|
2016-04-27 19:45:23 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
|
|
|
|
return -1; /* H.263 id */
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
skip_bits1(&s->gb); /* split screen off */
|
|
|
|
skip_bits1(&s->gb); /* camera off */
|
|
|
|
skip_bits1(&s->gb); /* freeze picture release off */
|
|
|
|
|
|
|
|
format = get_bits(&s->gb, 3);
|
|
|
|
/*
|
|
|
|
0 forbidden
|
|
|
|
1 sub-QCIF
|
|
|
|
10 QCIF
|
|
|
|
7 extended PTYPE (PLUSPTYPE)
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (format != 7 && format != 6) {
|
|
|
|
s->h263_plus = 0;
|
|
|
|
/* H.263v1 */
|
2012-02-09 12:28:46 +03:00
|
|
|
width = ff_h263_format[format][0];
|
|
|
|
height = ff_h263_format[format][1];
|
2010-01-09 16:59:06 +02:00
|
|
|
if (!width)
|
|
|
|
return -1;
|
|
|
|
|
2011-04-28 02:40:44 +03:00
|
|
|
s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
s->h263_long_vectors = get_bits1(&s->gb);
|
|
|
|
|
|
|
|
if (get_bits1(&s->gb) != 0) {
|
2016-04-27 19:45:23 +02:00
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "H.263 SAC not supported\n");
|
2010-01-09 16:59:06 +02:00
|
|
|
return -1; /* SAC: off */
|
|
|
|
}
|
|
|
|
s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
|
|
|
|
|
|
|
|
s->pb_frame = get_bits1(&s->gb);
|
|
|
|
s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
|
|
|
|
skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
|
|
|
|
|
|
|
|
s->width = width;
|
|
|
|
s->height = height;
|
|
|
|
s->avctx->sample_aspect_ratio= (AVRational){12,11};
|
2014-04-04 13:47:44 +03:00
|
|
|
s->avctx->framerate = (AVRational){ 30000, 1001 };
|
2010-01-09 16:59:06 +02:00
|
|
|
} else {
|
|
|
|
int ufep;
|
|
|
|
|
|
|
|
/* H.263v2 */
|
|
|
|
s->h263_plus = 1;
|
|
|
|
ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
|
|
|
|
|
|
|
|
/* ufep other than 0 and 1 are reserved */
|
|
|
|
if (ufep == 1) {
|
|
|
|
/* OPPTYPE */
|
|
|
|
format = get_bits(&s->gb, 3);
|
2015-03-16 10:57:36 +02:00
|
|
|
ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
|
2010-01-09 16:59:06 +02:00
|
|
|
s->custom_pcf= get_bits1(&s->gb);
|
|
|
|
s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
|
|
|
|
if (get_bits1(&s->gb) != 0) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
|
|
|
|
}
|
|
|
|
s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
|
|
|
|
s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
|
|
|
|
s->loop_filter= get_bits1(&s->gb);
|
2012-06-03 15:41:21 +03:00
|
|
|
if(s->avctx->lowres)
|
|
|
|
s->loop_filter = 0;
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
s->h263_slice_structured= get_bits1(&s->gb);
|
|
|
|
if (get_bits1(&s->gb) != 0) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
|
|
|
|
}
|
|
|
|
if (get_bits1(&s->gb) != 0) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
|
|
|
|
}
|
|
|
|
s->alt_inter_vlc= get_bits1(&s->gb);
|
|
|
|
s->modified_quant= get_bits1(&s->gb);
|
|
|
|
if(s->modified_quant)
|
|
|
|
s->chroma_qscale_table= ff_h263_chroma_qscale_table;
|
|
|
|
|
|
|
|
skip_bits(&s->gb, 1); /* Prevent start code emulation */
|
|
|
|
|
|
|
|
skip_bits(&s->gb, 3); /* Reserved */
|
|
|
|
} else if (ufep != 0) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* MPPTYPE */
|
|
|
|
s->pict_type = get_bits(&s->gb, 3);
|
|
|
|
switch(s->pict_type){
|
2011-04-28 02:40:44 +03:00
|
|
|
case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
|
|
|
|
case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
|
|
|
|
case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
|
|
|
|
case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
|
|
|
|
case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
|
2010-01-09 16:59:06 +02:00
|
|
|
default:
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
skip_bits(&s->gb, 2);
|
|
|
|
s->no_rounding = get_bits1(&s->gb);
|
|
|
|
skip_bits(&s->gb, 4);
|
|
|
|
|
|
|
|
/* Get the picture dimensions */
|
|
|
|
if (ufep) {
|
|
|
|
if (format == 6) {
|
|
|
|
/* Custom Picture Format (CPFMT) */
|
2022-01-25 14:24:13 +02:00
|
|
|
int aspect_ratio_info = get_bits(&s->gb, 4);
|
|
|
|
ff_dlog(s->avctx, "aspect: %d\n", aspect_ratio_info);
|
2010-01-09 16:59:06 +02:00
|
|
|
/* aspect ratios:
|
|
|
|
0 - forbidden
|
|
|
|
1 - 1:1
|
|
|
|
2 - 12:11 (CIF 4:3)
|
|
|
|
3 - 10:11 (525-type 4:3)
|
|
|
|
4 - 16:11 (CIF 16:9)
|
|
|
|
5 - 40:33 (525-type 16:9)
|
|
|
|
6-14 - reserved
|
|
|
|
*/
|
|
|
|
width = (get_bits(&s->gb, 9) + 1) * 4;
|
2016-06-22 20:07:46 +02:00
|
|
|
check_marker(s->avctx, &s->gb, "in dimensions");
|
2010-01-09 16:59:06 +02:00
|
|
|
height = get_bits(&s->gb, 9) * 4;
|
2015-03-16 10:57:36 +02:00
|
|
|
ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
|
2022-01-25 14:24:13 +02:00
|
|
|
if (aspect_ratio_info == FF_ASPECT_EXTENDED) {
|
2016-04-27 19:45:23 +02:00
|
|
|
/* expected dimensions */
|
2010-01-09 16:59:06 +02:00
|
|
|
s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
|
|
|
|
s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
|
|
|
|
}else{
|
2022-01-25 14:24:13 +02:00
|
|
|
s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[aspect_ratio_info];
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
} else {
|
2012-02-09 12:28:46 +03:00
|
|
|
width = ff_h263_format[format][0];
|
|
|
|
height = ff_h263_format[format][1];
|
2010-01-09 16:59:06 +02:00
|
|
|
s->avctx->sample_aspect_ratio= (AVRational){12,11};
|
|
|
|
}
|
2013-08-24 19:44:24 +03:00
|
|
|
s->avctx->sample_aspect_ratio.den <<= s->ehc_mode;
|
2010-01-09 16:59:06 +02:00
|
|
|
if ((width == 0) || (height == 0))
|
|
|
|
return -1;
|
|
|
|
s->width = width;
|
|
|
|
s->height = height;
|
|
|
|
|
|
|
|
if(s->custom_pcf){
|
|
|
|
int gcd;
|
2014-04-04 13:47:44 +03:00
|
|
|
s->avctx->framerate.num = 1800000;
|
|
|
|
s->avctx->framerate.den = 1000 + get_bits1(&s->gb);
|
|
|
|
s->avctx->framerate.den *= get_bits(&s->gb, 7);
|
|
|
|
if(s->avctx->framerate.den == 0){
|
2010-01-09 16:59:06 +02:00
|
|
|
av_log(s, AV_LOG_ERROR, "zero framerate\n");
|
|
|
|
return -1;
|
|
|
|
}
|
2014-04-04 13:47:44 +03:00
|
|
|
gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
|
|
|
|
s->avctx->framerate.den /= gcd;
|
|
|
|
s->avctx->framerate.num /= gcd;
|
2010-01-09 16:59:06 +02:00
|
|
|
}else{
|
2014-04-04 13:47:44 +03:00
|
|
|
s->avctx->framerate = (AVRational){ 30000, 1001 };
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if(s->custom_pcf){
|
|
|
|
skip_bits(&s->gb, 2); //extended Temporal reference
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ufep) {
|
|
|
|
if (s->umvplus) {
|
|
|
|
if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
|
|
|
|
skip_bits1(&s->gb);
|
|
|
|
}
|
|
|
|
if(s->h263_slice_structured){
|
|
|
|
if (get_bits1(&s->gb) != 0) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
|
|
|
|
}
|
|
|
|
if (get_bits1(&s->gb) != 0) {
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
|
|
|
|
}
|
|
|
|
}
|
2017-02-01 18:04:52 +02:00
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_B) {
|
|
|
|
skip_bits(&s->gb, 4); //ELNUM
|
|
|
|
if (ufep == 1) {
|
|
|
|
skip_bits(&s->gb, 4); // RLNUM
|
|
|
|
}
|
|
|
|
}
|
2010-01-09 16:59:06 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
s->qscale = get_bits(&s->gb, 5);
|
|
|
|
}
|
|
|
|
|
2015-06-26 15:57:16 +02:00
|
|
|
if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
|
|
|
|
return ret;
|
|
|
|
|
2019-09-24 00:42:04 +02:00
|
|
|
if (!(s->avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
|
|
|
|
if ((s->width * s->height / 256 / 8) > get_bits_left(&s->gb))
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
|
|
|
|
2010-01-09 16:59:06 +02:00
|
|
|
s->mb_width = (s->width + 15) / 16;
|
|
|
|
s->mb_height = (s->height + 15) / 16;
|
|
|
|
s->mb_num = s->mb_width * s->mb_height;
|
|
|
|
|
|
|
|
if (s->pb_frame) {
|
|
|
|
skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
|
|
|
|
if (s->custom_pcf)
|
|
|
|
skip_bits(&s->gb, 2); //extended Temporal reference
|
|
|
|
skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
|
|
|
|
}
|
|
|
|
|
2012-03-23 12:13:27 +03:00
|
|
|
if (s->pict_type!=AV_PICTURE_TYPE_B) {
|
2012-03-30 02:54:28 +03:00
|
|
|
s->time = s->picture_number;
|
|
|
|
s->pp_time = s->time - s->last_non_b_time;
|
|
|
|
s->last_non_b_time = s->time;
|
2012-03-23 12:13:27 +03:00
|
|
|
}else{
|
2012-03-30 02:54:28 +03:00
|
|
|
s->time = s->picture_number;
|
|
|
|
s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
|
|
|
|
if (s->pp_time <=s->pb_time ||
|
|
|
|
s->pp_time <= s->pp_time - s->pb_time ||
|
|
|
|
s->pp_time <= 0){
|
2012-03-23 12:13:27 +03:00
|
|
|
s->pp_time = 2;
|
|
|
|
s->pb_time = 1;
|
|
|
|
}
|
|
|
|
ff_mpeg4_init_direct_mv(s);
|
|
|
|
}
|
|
|
|
|
2010-01-09 16:59:06 +02:00
|
|
|
/* PEI */
|
2013-10-30 20:28:00 +03:00
|
|
|
if (skip_1stop_8data_bits(&s->gb) < 0)
|
|
|
|
return AVERROR_INVALIDDATA;
|
2010-01-09 16:59:06 +02:00
|
|
|
|
|
|
|
if(s->h263_slice_structured){
|
2016-06-22 20:07:46 +02:00
|
|
|
if (check_marker(s->avctx, &s->gb, "SEPB1") != 1) {
|
2010-01-09 16:59:06 +02:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
ff_h263_decode_mba(s);
|
|
|
|
|
2016-06-22 20:07:46 +02:00
|
|
|
if (check_marker(s->avctx, &s->gb, "SEPB2") != 1) {
|
2010-01-09 16:59:06 +02:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
s->f_code = 1;
|
|
|
|
|
2017-02-01 18:04:52 +02:00
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_B)
|
|
|
|
s->low_delay = 0;
|
|
|
|
|
2010-01-09 16:59:06 +02:00
|
|
|
if(s->h263_aic){
|
|
|
|
s->y_dc_scale_table=
|
|
|
|
s->c_dc_scale_table= ff_aic_dc_scale_table;
|
|
|
|
}else{
|
|
|
|
s->y_dc_scale_table=
|
|
|
|
s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
|
|
|
|
}
|
|
|
|
|
|
|
|
ff_h263_show_pict_info(s);
|
2012-03-02 18:52:32 +03:00
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
|
2010-01-09 16:59:06 +02:00
|
|
|
int i,j;
|
|
|
|
for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
|
|
|
|
av_log(s->avctx, AV_LOG_DEBUG, "\n");
|
|
|
|
for(i=0; i<13; i++){
|
|
|
|
for(j=0; j<3; j++){
|
|
|
|
int v= get_bits(&s->gb, 8);
|
2019-09-28 04:26:07 +02:00
|
|
|
v |= get_sbits(&s->gb, 8) * (1 << 8);
|
2010-01-09 16:59:06 +02:00
|
|
|
av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
|
|
|
|
}
|
|
|
|
av_log(s->avctx, AV_LOG_DEBUG, "\n");
|
|
|
|
}
|
|
|
|
for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|