/* * MSMPEG4 backend for encoder and decoder * Copyright (c) 2001 Fabrice Bellard * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at> * * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avcodec.h" #include "mpegutils.h" #include "mpegvideo.h" #include "msmpeg4.h" #include "libavutil/imgutils.h" #include "libavutil/x86/asm.h" #include "h263.h" #include "mpeg4video.h" #include "msmpeg4data.h" #include "vc1data.h" #define DC_VLC_BITS 9 #define V2_INTRA_CBPC_VLC_BITS 3 #define V2_MB_TYPE_VLC_BITS 7 #define MV_VLC_BITS 9 #define V2_MV_VLC_BITS 9 #define TEX_VLC_BITS 9 #define DEFAULT_INTER_INDEX 3 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n, int32_t **dc_val_ptr) { int i; if (n < 4) { i= 0; } else { i= n-3; } *dc_val_ptr= &s->last_dc[i]; return s->last_dc[i]; } /****************************************/ /* decoding stuff */ VLC ff_mb_non_intra_vlc[4]; static VLC v2_dc_lum_vlc; static VLC v2_dc_chroma_vlc; static VLC v2_intra_cbpc_vlc; static VLC v2_mb_type_vlc; static VLC v2_mv_vlc; VLC ff_inter_intra_vlc; /* This is identical to h263 except that its range is multiplied by 2. */ static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code) { int code, val, sign, shift; code = get_vlc2(&s->gb, v2_mv_vlc.table, V2_MV_VLC_BITS, 2); av_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred); if (code < 0) return 0xffff; if (code == 0) return pred; 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; if (val <= -64) val += 64; else if (val >= 64) val -= 64; return val; } static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64]) { int cbp, code, i; uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride]; if (s->pict_type == AV_PICTURE_TYPE_P) { if (s->use_skip_mb_code) { 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; s->mv[0][0][0] = 0; s->mv[0][0][1] = 0; s->mb_skipped = 1; *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16; return 0; } } if(s->msmpeg4_version==2) code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1); else code = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); if(code<0 || code>7){ av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y); return -1; } s->mb_intra = code >>2; cbp = code & 0x3; } else { s->mb_intra = 1; if(s->msmpeg4_version==2) cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1); else cbp= get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 1); if(cbp<0 || cbp>3){ av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y); return -1; } } if (!s->mb_intra) { int mx, my, cbpy; cbpy= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); if(cbpy<0){ av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y); return -1; } cbp|= cbpy<<2; if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C; ff_h263_pred_motion(s, 0, 0, &mx, &my); mx= msmpeg4v2_decode_motion(s, mx, 1); my= msmpeg4v2_decode_motion(s, my, 1); s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; s->mv[0][0][0] = mx; s->mv[0][0][1] = my; *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16; } else { if(s->msmpeg4_version==2){ s->ac_pred = get_bits1(&s->gb); cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors } else{ s->ac_pred = 0; cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C; } *mb_type_ptr = MB_TYPE_INTRA; } s->bdsp.clear_blocks(s->block[0]); for (i = 0; i < 6; i++) { if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0) { av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i); return -1; } } return 0; } static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64]) { int cbp, code, i; uint8_t *coded_val; uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride]; if (s->pict_type == AV_PICTURE_TYPE_P) { if (s->use_skip_mb_code) { 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; s->mv[0][0][0] = 0; s->mv[0][0][1] = 0; s->mb_skipped = 1; *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16; return 0; } } code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3); if (code < 0) return -1; //s->mb_intra = (code & 0x40) ? 0 : 1; s->mb_intra = (~code & 0x40) >> 6; cbp = code & 0x3f; } else { s->mb_intra = 1; code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2); if (code < 0) return -1; /* predict coded block pattern */ cbp = 0; for(i=0;i<6;i++) { int val = ((code >> (5 - i)) & 1); if (i < 4) { int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val); val = val ^ pred; *coded_val = val; } cbp |= val << (5 - i); } } if (!s->mb_intra) { int mx, my; if(s->per_mb_rl_table && cbp){ s->rl_table_index = decode012(&s->gb); s->rl_chroma_table_index = s->rl_table_index; } ff_h263_pred_motion(s, 0, 0, &mx, &my); if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0) return -1; s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; s->mv[0][0][0] = mx; s->mv[0][0][1] = my; *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16; } else { av_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y, ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0), show_bits(&s->gb, 24)); s->ac_pred = get_bits1(&s->gb); *mb_type_ptr = MB_TYPE_INTRA; if(s->inter_intra_pred){ s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1); av_dlog(s, "%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y); } if(s->per_mb_rl_table && cbp){ s->rl_table_index = decode012(&s->gb); s->rl_chroma_table_index = s->rl_table_index; } } s->bdsp.clear_blocks(s->block[0]); for (i = 0; i < 6; i++) { if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0) { av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i); return -1; } } return 0; } /* init all vlc decoding tables */ av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx) { MpegEncContext *s = avctx->priv_data; static volatile int done = 0; int i, ret; MVTable *mv; if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) return ret; if (ff_h263_decode_init(avctx) < 0) return -1; ff_msmpeg4_common_init(s); if (!done) { for(i=0;i<NB_RL_TABLES;i++) { ff_init_rl(&ff_rl_table[i], ff_static_rl_table_store[i]); } INIT_VLC_RL(ff_rl_table[0], 642); INIT_VLC_RL(ff_rl_table[1], 1104); INIT_VLC_RL(ff_rl_table[2], 554); INIT_VLC_RL(ff_rl_table[3], 940); INIT_VLC_RL(ff_rl_table[4], 962); INIT_VLC_RL(ff_rl_table[5], 554); mv = &ff_mv_tables[0]; INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1, mv->table_mv_bits, 1, 1, mv->table_mv_code, 2, 2, 3714); mv = &ff_mv_tables[1]; INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1, mv->table_mv_bits, 1, 1, mv->table_mv_code, 2, 2, 2694); INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120, &ff_table0_dc_lum[0][1], 8, 4, &ff_table0_dc_lum[0][0], 8, 4, 1158); INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120, &ff_table0_dc_chroma[0][1], 8, 4, &ff_table0_dc_chroma[0][0], 8, 4, 1118); INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120, &ff_table1_dc_lum[0][1], 8, 4, &ff_table1_dc_lum[0][0], 8, 4, 1476); INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120, &ff_table1_dc_chroma[0][1], 8, 4, &ff_table1_dc_chroma[0][0], 8, 4, 1216); INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512, &ff_v2_dc_lum_table[0][1], 8, 4, &ff_v2_dc_lum_table[0][0], 8, 4, 1472); INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512, &ff_v2_dc_chroma_table[0][1], 8, 4, &ff_v2_dc_chroma_table[0][0], 8, 4, 1506); INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4, &ff_v2_intra_cbpc[0][1], 2, 1, &ff_v2_intra_cbpc[0][0], 2, 1, 8); INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8, &ff_v2_mb_type[0][1], 2, 1, &ff_v2_mb_type[0][0], 2, 1, 128); INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33, &ff_mvtab[0][1], 2, 1, &ff_mvtab[0][0], 2, 1, 538); INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128, &ff_wmv2_inter_table[0][0][1], 8, 4, &ff_wmv2_inter_table[0][0][0], 8, 4, 1636); INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128, &ff_wmv2_inter_table[1][0][1], 8, 4, &ff_wmv2_inter_table[1][0][0], 8, 4, 2648); INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128, &ff_wmv2_inter_table[2][0][1], 8, 4, &ff_wmv2_inter_table[2][0][0], 8, 4, 1532); INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128, &ff_wmv2_inter_table[3][0][1], 8, 4, &ff_wmv2_inter_table[3][0][0], 8, 4, 2488); INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64, &ff_msmp4_mb_i_table[0][1], 4, 2, &ff_msmp4_mb_i_table[0][0], 4, 2, 536); INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4, &ff_table_inter_intra[0][1], 2, 1, &ff_table_inter_intra[0][0], 2, 1, 8); done = 1; } switch(s->msmpeg4_version){ case 1: case 2: s->decode_mb= msmpeg4v12_decode_mb; break; case 3: case 4: s->decode_mb= msmpeg4v34_decode_mb; break; case 5: if (CONFIG_WMV2_DECODER) s->decode_mb= ff_wmv2_decode_mb; case 6: //FIXME + TODO VC1 decode mb break; } s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe return 0; } int ff_msmpeg4_decode_picture_header(MpegEncContext * s) { int code; if(s->msmpeg4_version==1){ int start_code = get_bits_long(&s->gb, 32); if(start_code!=0x00000100){ av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n"); return -1; } skip_bits(&s->gb, 5); // frame number */ } s->pict_type = get_bits(&s->gb, 2) + 1; if (s->pict_type != AV_PICTURE_TYPE_I && s->pict_type != AV_PICTURE_TYPE_P){ av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n"); return -1; } #if 0 { static int had_i=0; if(s->pict_type == AV_PICTURE_TYPE_I) had_i=1; if(!had_i) return -1; } #endif s->chroma_qscale= s->qscale = get_bits(&s->gb, 5); if(s->qscale==0){ av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n"); return -1; } if (s->pict_type == AV_PICTURE_TYPE_I) { code = get_bits(&s->gb, 5); if(s->msmpeg4_version==1){ if(code==0 || code>s->mb_height){ av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code); return -1; } s->slice_height = code; }else{ /* 0x17: one slice, 0x18: two slices, ... */ if (code < 0x17){ av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code); return -1; } s->slice_height = s->mb_height / (code - 0x16); } switch(s->msmpeg4_version){ case 1: case 2: s->rl_chroma_table_index = 2; s->rl_table_index = 2; s->dc_table_index = 0; //not used break; case 3: s->rl_chroma_table_index = decode012(&s->gb); s->rl_table_index = decode012(&s->gb); s->dc_table_index = get_bits1(&s->gb); break; case 4: ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8); if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb); else s->per_mb_rl_table= 0; if(!s->per_mb_rl_table){ s->rl_chroma_table_index = decode012(&s->gb); s->rl_table_index = decode012(&s->gb); } s->dc_table_index = get_bits1(&s->gb); s->inter_intra_pred= 0; break; } s->no_rounding = 1; if(s->avctx->debug&FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n", s->qscale, s->rl_chroma_table_index, s->rl_table_index, s->dc_table_index, s->per_mb_rl_table, s->slice_height); } else { switch(s->msmpeg4_version){ case 1: case 2: if(s->msmpeg4_version==1) s->use_skip_mb_code = 1; else s->use_skip_mb_code = get_bits1(&s->gb); s->rl_table_index = 2; s->rl_chroma_table_index = s->rl_table_index; s->dc_table_index = 0; //not used s->mv_table_index = 0; break; case 3: s->use_skip_mb_code = get_bits1(&s->gb); s->rl_table_index = decode012(&s->gb); s->rl_chroma_table_index = s->rl_table_index; s->dc_table_index = get_bits1(&s->gb); s->mv_table_index = get_bits1(&s->gb); break; case 4: s->use_skip_mb_code = get_bits1(&s->gb); if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb); else s->per_mb_rl_table= 0; if(!s->per_mb_rl_table){ s->rl_table_index = decode012(&s->gb); s->rl_chroma_table_index = s->rl_table_index; } s->dc_table_index = get_bits1(&s->gb); s->mv_table_index = get_bits1(&s->gb); s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE); break; } if(s->avctx->debug&FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n", s->use_skip_mb_code, s->rl_table_index, s->rl_chroma_table_index, s->dc_table_index, s->mv_table_index, s->per_mb_rl_table, s->qscale); if(s->flipflop_rounding){ s->no_rounding ^= 1; }else{ s->no_rounding = 0; } } av_dlog(s->avctx, "%d %d %d %d %d\n", s->pict_type, s->bit_rate, s->inter_intra_pred, s->width, s->height); s->esc3_level_length= 0; s->esc3_run_length= 0; return 0; } int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size) { int left= buf_size*8 - get_bits_count(&s->gb); int length= s->msmpeg4_version>=3 ? 17 : 16; /* the alt_bitstream reader could read over the end so we need to check it */ if(left>=length && left<length+8) { skip_bits(&s->gb, 5); /* fps */ s->bit_rate= get_bits(&s->gb, 11)*1024; if(s->msmpeg4_version>=3) s->flipflop_rounding= get_bits1(&s->gb); else s->flipflop_rounding= 0; } else if(left<length+8) { s->flipflop_rounding= 0; if(s->msmpeg4_version != 2) av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left); } else { av_log(s->avctx, AV_LOG_ERROR, "I frame too long, ignoring ext header\n"); } return 0; } static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr) { int level, pred; if(s->msmpeg4_version<=2){ if (n < 4) { level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3); } else { level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3); } if (level < 0) { av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n"); *dir_ptr = 0; return -1; } level-=256; }else{ //FIXME optimize use unified tables & index if (n < 4) { level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3); } else { level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3); } if (level < 0){ av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n"); *dir_ptr = 0; return -1; } if (level == DC_MAX) { level = get_bits(&s->gb, 8); if (get_bits1(&s->gb)) level = -level; } else if (level != 0) { if (get_bits1(&s->gb)) level = -level; } } if(s->msmpeg4_version==1){ int32_t *dc_val; pred = msmpeg4v1_pred_dc(s, n, &dc_val); level += pred; /* update predictor */ *dc_val= level; }else{ int16_t *dc_val; pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr); level += pred; /* update predictor */ if (n < 4) { *dc_val = level * s->y_dc_scale; } else { *dc_val = level * s->c_dc_scale; } } return level; } //#define ERROR_DETAILS int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block, int n, int coded, const uint8_t *scan_table) { int level, i, last, run, run_diff; int av_uninit(dc_pred_dir); RLTable *rl; RL_VLC_ELEM *rl_vlc; int qmul, qadd; if (s->mb_intra) { qmul=1; qadd=0; /* DC coef */ level = msmpeg4_decode_dc(s, n, &dc_pred_dir); if (level < 0){ av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale); if(s->inter_intra_pred) level=0; } if (n < 4) { rl = &ff_rl_table[s->rl_table_index]; if(level > 256*s->y_dc_scale){ av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale); if(!s->inter_intra_pred) return -1; } } else { rl = &ff_rl_table[3 + s->rl_chroma_table_index]; if(level > 256*s->c_dc_scale){ av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale); if(!s->inter_intra_pred) return -1; } } block[0] = level; run_diff = s->msmpeg4_version >= 4; i = 0; if (!coded) { goto not_coded; } if (s->ac_pred) { if (dc_pred_dir == 0) scan_table = s->intra_v_scantable.permutated; /* left */ else scan_table = s->intra_h_scantable.permutated; /* top */ } else { scan_table = s->intra_scantable.permutated; } rl_vlc= rl->rl_vlc[0]; } else { qmul = s->qscale << 1; qadd = (s->qscale - 1) | 1; i = -1; rl = &ff_rl_table[3 + s->rl_table_index]; if(s->msmpeg4_version==2) run_diff = 0; else run_diff = 1; if (!coded) { s->block_last_index[n] = i; return 0; } if(!scan_table) scan_table = s->inter_scantable.permutated; rl_vlc= rl->rl_vlc[s->qscale]; } { OPEN_READER(re, &s->gb); for(;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0); if (level==0) { int cache; cache= GET_CACHE(re, &s->gb); /* escape */ if (s->msmpeg4_version==1 || (cache&0x80000000)==0) { if (s->msmpeg4_version==1 || (cache&0x40000000)==0) { /* third escape */ if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2); UPDATE_CACHE(re, &s->gb); if(s->msmpeg4_version<=3){ last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1); run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6); level= SHOW_SBITS(re, &s->gb, 8); SKIP_COUNTER(re, &s->gb, 1+6+8); }else{ int sign; last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); if(!s->esc3_level_length){ int ll; av_dlog(s->avctx, "ESC-3 %X at %d %d\n", show_bits(&s->gb, 24), s->mb_x, s->mb_y); if(s->qscale<8){ ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3); if(ll==0){ ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } }else{ ll=2; while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){ ll++; SKIP_BITS(re, &s->gb, 1); } if(ll<8) SKIP_BITS(re, &s->gb, 1); } s->esc3_level_length= ll; s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2); UPDATE_CACHE(re, &s->gb); } run= SHOW_UBITS(re, &s->gb, s->esc3_run_length); SKIP_BITS(re, &s->gb, s->esc3_run_length); sign= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); level= SHOW_UBITS(re, &s->gb, s->esc3_level_length); SKIP_BITS(re, &s->gb, s->esc3_level_length); if(sign) level= -level; } #if 0 // waste of time / this will detect very few errors { const int abs_level= FFABS(level); const int run1= run - rl->max_run[last][abs_level] - run_diff; if(abs_level<=MAX_LEVEL && run<=MAX_RUN){ if(abs_level <= rl->max_level[last][run]){ av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n"); return DECODING_AC_LOST; } if(abs_level <= rl->max_level[last][run]*2){ av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n"); return DECODING_AC_LOST; } if(run1>=0 && abs_level <= rl->max_level[last][run1]){ av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n"); return DECODING_AC_LOST; } } } #endif //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ; if (level>0) level= level * qmul + qadd; else level= level * qmul - qadd; #if 0 // waste of time too :( if(level>2048 || level<-2048){ av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc\n"); return DECODING_AC_LOST; } #endif i+= run + 1; if(last) i+=192; #ifdef ERROR_DETAILS if(run==66) av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC3 level=%d\n", level); else if((i>62 && i<192) || i>192+63) av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC3 i=%d run=%d level=%d\n", i, run, level); #endif } else { /* second escape */ SKIP_BITS(re, &s->gb, 2); GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); #ifdef ERROR_DETAILS if(run==66) av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC2 level=%d\n", level); else if((i>62 && i<192) || i>192+63) av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC2 i=%d run=%d level=%d\n", i, run, level); #endif } } else { /* first escape */ SKIP_BITS(re, &s->gb, 1); GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1); i+= run; level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); #ifdef ERROR_DETAILS if(run==66) av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC1 level=%d\n", level); else if((i>62 && i<192) || i>192+63) av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC1 i=%d run=%d level=%d\n", i, run, level); #endif } } else { i+= run; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); #ifdef ERROR_DETAILS if(run==66) av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code level=%d\n", level); else if((i>62 && i<192) || i>192+63) av_log(s->avctx, AV_LOG_ERROR, "run overflow i=%d run=%d level=%d\n", i, run, level); #endif } if (i > 62){ i-= 192; if(i&(~63)){ const int left= get_bits_left(&s->gb); if(((i+192 == 64 && level/qmul==-1) || !(s->err_recognition&(AV_EF_BITSTREAM|AV_EF_COMPLIANT))) && left>=0){ av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y); i = 63; break; }else{ av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); return -1; } } block[scan_table[i]] = level; break; } block[scan_table[i]] = level; } CLOSE_READER(re, &s->gb); } not_coded: if (s->mb_intra) { ff_mpeg4_pred_ac(s, block, n, dc_pred_dir); if (s->ac_pred) { i = 63; /* XXX: not optimal */ } } if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize s->block_last_index[n] = i; return 0; } int ff_msmpeg4_decode_motion(MpegEncContext * s, int *mx_ptr, int *my_ptr) { MVTable *mv; int code, mx, my; mv = &ff_mv_tables[s->mv_table_index]; code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2); if (code < 0){ av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y); return -1; } if (code == mv->n) { mx = get_bits(&s->gb, 6); my = get_bits(&s->gb, 6); } else { mx = mv->table_mvx[code]; my = mv->table_mvy[code]; } mx += *mx_ptr - 32; my += *my_ptr - 32; /* WARNING : they do not do exactly modulo encoding */ if (mx <= -64) mx += 64; else if (mx >= 64) mx -= 64; if (my <= -64) my += 64; else if (my >= 64) my -= 64; *mx_ptr = mx; *my_ptr = my; return 0; } AVCodec ff_msmpeg4v1_decoder = { .name = "msmpeg4v1", .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_MSMPEG4V1, .priv_data_size = sizeof(MpegEncContext), .init = ff_msmpeg4_decode_init, .close = ff_h263_decode_end, .decode = ff_h263_decode_frame, .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, .max_lowres = 3, .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }, }; AVCodec ff_msmpeg4v2_decoder = { .name = "msmpeg4v2", .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_MSMPEG4V2, .priv_data_size = sizeof(MpegEncContext), .init = ff_msmpeg4_decode_init, .close = ff_h263_decode_end, .decode = ff_h263_decode_frame, .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, .max_lowres = 3, .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }, }; AVCodec ff_msmpeg4v3_decoder = { .name = "msmpeg4", .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_MSMPEG4V3, .priv_data_size = sizeof(MpegEncContext), .init = ff_msmpeg4_decode_init, .close = ff_h263_decode_end, .decode = ff_h263_decode_frame, .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, .max_lowres = 3, .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }, }; AVCodec ff_wmv1_decoder = { .name = "wmv1", .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_WMV1, .priv_data_size = sizeof(MpegEncContext), .init = ff_msmpeg4_decode_init, .close = ff_h263_decode_end, .decode = ff_h263_decode_frame, .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, .max_lowres = 3, .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }, };