/* * MSMPEG4 backend for encoder and decoder * Copyright (c) 2001 Fabrice Bellard * Copyright (c) 2002-2013 Michael Niedermayer * * msmpeg4v1 & v2 stuff by Michael Niedermayer * * 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 "libavutil/thread.h" #include "avcodec.h" #include "codec_internal.h" #include "mpegutils.h" #include "mpegvideo.h" #include "mpegvideodec.h" #include "msmpeg4.h" #include "msmpeg4dec.h" #include "libavutil/imgutils.h" #include "h263.h" #include "h263data.h" #include "h263dec.h" #include "mpeg4videodec.h" #include "msmpeg4data.h" #include "msmpeg4_vc1_data.h" #define V2_INTRA_CBPC_VLC_BITS 3 #define V2_MB_TYPE_VLC_BITS 7 #define 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 */ const VLCElem *ff_mb_non_intra_vlc[4]; static VLCElem v2_dc_lum_vlc[1472]; static VLCElem v2_dc_chroma_vlc[1506]; static VLCElem v2_intra_cbpc_vlc[8]; static VLCElem v2_mb_type_vlc[128]; VLCElem ff_inter_intra_vlc[8]; /* This is identical to H.263 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, ff_h263_mv_vlc, H263_MV_VLC_BITS, 2); ff_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->cur_pic.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 == MSMP4_V2) code = get_vlc2(&s->gb, v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 1); else code = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc, 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 == MSMP4_V2) cbp = get_vlc2(&s->gb, v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 1); else cbp = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 2); 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, 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 == MSMP4_V1 || (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 { int v; if (s->msmpeg4_version == MSMP4_V2) { s->ac_pred = get_bits1(&s->gb); v = get_vlc2(&s->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1); if (v < 0) { av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n"); return -1; } cbp|= v<<2; } else{ s->ac_pred = 0; v = get_vlc2(&s->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1); if (v < 0) { av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n"); return -1; } cbp|= v<<2; 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->cur_pic.mb_type[s->mb_x + s->mb_y*s->mb_stride]; if (get_bits_left(&s->gb) <= 0) return AVERROR_INVALIDDATA; 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], MB_NON_INTRA_VLC_BITS, 3); //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, MSMP4_MB_INTRA_VLC_BITS, 2); /* 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); ff_msmpeg4_decode_motion(s, &mx, &my); 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 { ff_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, INTER_INTRA_VLC_BITS, 1); ff_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 */ static av_cold void msmpeg4_decode_init_static(void) { static VLCElem vlc_buf[3714 + 2694 + 1636 + 2648 + 1532 + 2488]; VLCInitState state = VLC_INIT_STATE(vlc_buf); MVTable *mv; INIT_FIRST_VLC_RL(ff_rl_table[0], 642); INIT_FIRST_VLC_RL(ff_rl_table[1], 1104); INIT_FIRST_VLC_RL(ff_rl_table[2], 554); VLC_INIT_RL(ff_rl_table[3], 940); VLC_INIT_RL(ff_rl_table[4], 962); /* ff_rl_table[5] coincides with ff_h263_rl_inter which has just been * initialized in ff_h263_decode_init() earlier. So just copy the VLCs. */ av_assert1(ff_h263_rl_inter.rl_vlc[0]); memcpy(ff_rl_table[5].rl_vlc, ff_h263_rl_inter.rl_vlc, sizeof(ff_rl_table[5].rl_vlc)); VLC_INIT_STATIC_TABLE(v2_dc_lum_vlc, MSMP4_DC_VLC_BITS, 512, &ff_v2_dc_lum_table[0][1], 8, 4, &ff_v2_dc_lum_table[0][0], 8, 4, 0); VLC_INIT_STATIC_TABLE(v2_dc_chroma_vlc, MSMP4_DC_VLC_BITS, 512, &ff_v2_dc_chroma_table[0][1], 8, 4, &ff_v2_dc_chroma_table[0][0], 8, 4, 0); VLC_INIT_STATIC_TABLE(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, 0); VLC_INIT_STATIC_TABLE(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, 0); mv = &ff_mv_tables[0]; mv->vlc = ff_vlc_init_tables_sparse(&state, MV_VLC_BITS, MSMPEG4_MV_TABLES_NB_ELEMS + 1, mv->table_mv_bits, 1, 1, mv->table_mv_code, 2, 2, NULL, 0, 0, 0); mv = &ff_mv_tables[1]; mv->vlc = ff_vlc_init_tables_sparse(&state, MV_VLC_BITS, MSMPEG4_MV_TABLES_NB_ELEMS + 1, mv->table_mv_bits, 1, 1, mv->table_mv_code, 2, 2, NULL, 0, 0, 0); for (unsigned i = 0; i < 4; i++) { ff_mb_non_intra_vlc[i] = ff_vlc_init_tables_sparse(&state, MB_NON_INTRA_VLC_BITS, 128, &ff_wmv2_inter_table[i][0][1], 8, 4, &ff_wmv2_inter_table[i][0][0], 8, 4, NULL, 0, 0, 0); } VLC_INIT_STATIC_TABLE(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, 0); ff_msmp4_vc1_vlcs_init_once(); } av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx) { static AVOnce init_static_once = AV_ONCE_INIT; MpegEncContext *s = avctx->priv_data; int ret; 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); switch (s->msmpeg4_version) { case MSMP4_V1: case MSMP4_V2: s->decode_mb= msmpeg4v12_decode_mb; break; case MSMP4_V3: case MSMP4_WMV1: s->decode_mb= msmpeg4v34_decode_mb; break; case MSMP4_WMV2: break; } s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe ff_thread_once(&init_static_once, msmpeg4_decode_init_static); return 0; } int ff_msmpeg4_decode_picture_header(MpegEncContext * s) { int code; // at minimum one bit per macroblock is required at least in a valid frame, // we discard frames much smaller than this. Frames smaller than 1/8 of the // smallest "black/skip" frame generally contain not much recoverable content // while at the same time they have the highest computational requirements // per byte if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16)) return AVERROR_INVALIDDATA; if (s->msmpeg4_version == MSMP4_V1) { 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; } 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 == MSMP4_V1) { 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 MSMP4_V1: case MSMP4_V2: s->rl_chroma_table_index = 2; s->rl_table_index = 2; s->dc_table_index = 0; //not used break; case MSMP4_V3: 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 MSMP4_WMV1: 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 MSMP4_V1: case MSMP4_V2: if (s->msmpeg4_version == MSMP4_V1) 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 MSMP4_V3: 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 MSMP4_WMV1: 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; } } ff_dlog(s->avctx, "%d %"PRId64" %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 >= MSMP4_V3 ? 17 : 16; /* the alt_bitstream reader could read over the end so we need to check it */ if(left>=length && leftgb, 5); /* fps */ s->bit_rate= get_bits(&s->gb, 11)*1024; if (s->msmpeg4_version >= MSMP4_V3) s->flipflop_rounding= get_bits1(&s->gb); else s->flipflop_rounding= 0; } else if(leftflipflop_rounding= 0; if (s->msmpeg4_version != MSMP4_V2) 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 <= MSMP4_V2) { if (n < 4) { level = get_vlc2(&s->gb, v2_dc_lum_vlc, MSMP4_DC_VLC_BITS, 3); } else { level = get_vlc2(&s->gb, v2_dc_chroma_vlc, MSMP4_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 { level = get_vlc2(&s->gb, ff_msmp4_dc_vlc[s->dc_table_index][n >= 4], MSMP4_DC_VLC_BITS, 3); 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 == MSMP4_V1) { 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; } 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); const RLTable *rl; const 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 >= MSMP4_WMV1; i = 0; if (!coded) { goto not_coded; } if (s->ac_pred) { if (dc_pred_dir == 0) scan_table = s->permutated_intra_v_scantable; /* left */ else scan_table = s->permutated_intra_h_scantable; /* 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 == MSMP4_V2) 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 == MSMP4_V1 || (cache&0x80000000)==0) { if (s->msmpeg4_version == MSMP4_V1 || (cache&0x40000000)==0) { /* third escape */ if (s->msmpeg4_version != MSMP4_V1) LAST_SKIP_BITS(re, &s->gb, 2); UPDATE_CACHE(re, &s->gb); if (s->msmpeg4_version <= MSMP4_V3) { 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; ff_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; } //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ; if (level>0) level= level * qmul + qadd; else level= level * qmul - qadd; i+= run + 1; if(last) i+=192; } 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); } } 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); } } else { i+= run; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } if (i > 62){ i-= 192; if(i&(~63)){ const int left= get_bits_left(&s->gb); if (((i + 192 == 64 && level / qmul == -1) || !(s->avctx->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 >= MSMP4_WMV1 && i > 0) i=63; //FIXME/XXX optimize s->block_last_index[n] = i; return 0; } void ff_msmpeg4_decode_motion(MpegEncContext *s, int *mx_ptr, int *my_ptr) { const MVTable *mv; int code, mx, my; mv = &ff_mv_tables[s->mv_table_index]; code = get_vlc2(&s->gb, mv->vlc, MV_VLC_BITS, 2); if (code == MSMPEG4_MV_TABLES_NB_ELEMS) { 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; } const FFCodec ff_msmpeg4v1_decoder = { .p.name = "msmpeg4v1", CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 1"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_MSMPEG4V1, .priv_data_size = sizeof(MpegEncContext), .init = ff_msmpeg4_decode_init, FF_CODEC_DECODE_CB(ff_h263_decode_frame), .close = ff_mpv_decode_close, .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1, .caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM, .p.max_lowres = 3, }; const FFCodec ff_msmpeg4v2_decoder = { .p.name = "msmpeg4v2", CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 2"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_MSMPEG4V2, .priv_data_size = sizeof(MpegEncContext), .init = ff_msmpeg4_decode_init, FF_CODEC_DECODE_CB(ff_h263_decode_frame), .close = ff_mpv_decode_close, .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1, .caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM, .p.max_lowres = 3, }; const FFCodec ff_msmpeg4v3_decoder = { .p.name = "msmpeg4", CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 3"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_MSMPEG4V3, .priv_data_size = sizeof(MpegEncContext), .init = ff_msmpeg4_decode_init, FF_CODEC_DECODE_CB(ff_h263_decode_frame), .close = ff_mpv_decode_close, .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1, .caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM, .p.max_lowres = 3, }; const FFCodec ff_wmv1_decoder = { .p.name = "wmv1", CODEC_LONG_NAME("Windows Media Video 7"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_WMV1, .priv_data_size = sizeof(MpegEncContext), .init = ff_msmpeg4_decode_init, FF_CODEC_DECODE_CB(ff_h263_decode_frame), .close = ff_mpv_decode_close, .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1, .caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM, .p.max_lowres = 3, };