diff options
Diffstat (limited to 'libavcodec/msmpeg4dec.c')
-rw-r--r-- | libavcodec/msmpeg4dec.c | 965 |
1 files changed, 965 insertions, 0 deletions
diff --git a/libavcodec/msmpeg4dec.c b/libavcodec/msmpeg4dec.c new file mode 100644 index 0000000000..586c41c2b2 --- /dev/null +++ b/libavcodec/msmpeg4dec.c @@ -0,0 +1,965 @@ +/* + * 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 "dsputil.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->dsp.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->dsp.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) + 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"); + 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; + else return -1; + } + 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", + .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, + .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"), + .pix_fmts = ff_pixfmt_list_420, +}; + +AVCodec ff_msmpeg4v2_decoder = { + .name = "msmpeg4v2", + .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, + .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"), + .pix_fmts = ff_pixfmt_list_420, +}; + +AVCodec ff_msmpeg4v3_decoder = { + .name = "msmpeg4", + .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, + .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"), + .pix_fmts = ff_pixfmt_list_420, +}; + +AVCodec ff_wmv1_decoder = { + .name = "wmv1", + .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, + .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 7"), + .pix_fmts = ff_pixfmt_list_420, +}; 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