| /* |
| * ITU H263 bitstream decoder |
| * Copyright (c) 2000,2001 Fabrice Bellard |
| * H263+ support. |
| * Copyright (c) 2001 Juan J. Sierralta P |
| * Copyright (c) 2002-2004 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 |
| */ |
| |
| /** |
| * @file |
| * h263 decoder. |
| */ |
| |
| #define UNCHECKED_BITSTREAM_READER 1 |
| #include <limits.h> |
| |
| #include "libavutil/attributes.h" |
| #include "libavutil/imgutils.h" |
| #include "libavutil/internal.h" |
| #include "libavutil/mathematics.h" |
| #include "avcodec.h" |
| #include "mpegvideo.h" |
| #include "h263.h" |
| #include "h263data.h" |
| #include "internal.h" |
| #include "mathops.h" |
| #include "mpegutils.h" |
| #include "unary.h" |
| #include "flv.h" |
| #include "rv10.h" |
| #include "mpeg4video.h" |
| #include "mpegvideodata.h" |
| |
| // The defines below define the number of bits that are read at once for |
| // reading vlc values. Changing these may improve speed and data cache needs |
| // be aware though that decreasing them may need the number of stages that is |
| // passed to get_vlc* to be increased. |
| #define MV_VLC_BITS 9 |
| #define H263_MBTYPE_B_VLC_BITS 6 |
| #define CBPC_B_VLC_BITS 3 |
| |
| static const int h263_mb_type_b_map[15]= { |
| MB_TYPE_DIRECT2 | MB_TYPE_L0L1, |
| MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP, |
| MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT, |
| MB_TYPE_L0 | MB_TYPE_16x16, |
| MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_16x16, |
| MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16, |
| MB_TYPE_L1 | MB_TYPE_16x16, |
| MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_16x16, |
| MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16, |
| MB_TYPE_L0L1 | MB_TYPE_16x16, |
| MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_16x16, |
| MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16, |
| 0, //stuffing |
| MB_TYPE_INTRA4x4 | MB_TYPE_CBP, |
| MB_TYPE_INTRA4x4 | MB_TYPE_CBP | MB_TYPE_QUANT, |
| }; |
| |
| void ff_h263_show_pict_info(MpegEncContext *s){ |
| if(s->avctx->debug&FF_DEBUG_PICT_INFO){ |
| 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", |
| s->qscale, av_get_picture_type_char(s->pict_type), |
| s->gb.size_in_bits, 1-s->no_rounding, |
| s->obmc ? " AP" : "", |
| s->umvplus ? " UMV" : "", |
| s->h263_long_vectors ? " LONG" : "", |
| s->h263_plus ? " +" : "", |
| s->h263_aic ? " AIC" : "", |
| s->alt_inter_vlc ? " AIV" : "", |
| s->modified_quant ? " MQ" : "", |
| s->loop_filter ? " LOOP" : "", |
| s->h263_slice_structured ? " SS" : "", |
| s->avctx->framerate.num, s->avctx->framerate.den |
| ); |
| } |
| } |
| |
| /***********************************************/ |
| /* decoding */ |
| |
| VLC ff_h263_intra_MCBPC_vlc; |
| VLC ff_h263_inter_MCBPC_vlc; |
| VLC ff_h263_cbpy_vlc; |
| static VLC mv_vlc; |
| static VLC h263_mbtype_b_vlc; |
| static VLC cbpc_b_vlc; |
| |
| /* init vlcs */ |
| |
| /* XXX: find a better solution to handle static init */ |
| av_cold void ff_h263_decode_init_vlc(void) |
| { |
| static volatile int done = 0; |
| |
| if (!done) { |
| INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9, |
| ff_h263_intra_MCBPC_bits, 1, 1, |
| ff_h263_intra_MCBPC_code, 1, 1, 72); |
| INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28, |
| ff_h263_inter_MCBPC_bits, 1, 1, |
| ff_h263_inter_MCBPC_code, 1, 1, 198); |
| INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16, |
| &ff_h263_cbpy_tab[0][1], 2, 1, |
| &ff_h263_cbpy_tab[0][0], 2, 1, 64); |
| INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33, |
| &ff_mvtab[0][1], 2, 1, |
| &ff_mvtab[0][0], 2, 1, 538); |
| ff_rl_init(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]); |
| ff_rl_init(&ff_rl_intra_aic, ff_h263_static_rl_table_store[1]); |
| INIT_VLC_RL(ff_h263_rl_inter, 554); |
| INIT_VLC_RL(ff_rl_intra_aic, 554); |
| INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15, |
| &ff_h263_mbtype_b_tab[0][1], 2, 1, |
| &ff_h263_mbtype_b_tab[0][0], 2, 1, 80); |
| INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4, |
| &ff_cbpc_b_tab[0][1], 2, 1, |
| &ff_cbpc_b_tab[0][0], 2, 1, 8); |
| done = 1; |
| } |
| } |
| |
| int ff_h263_decode_mba(MpegEncContext *s) |
| { |
| int i, mb_pos; |
| |
| for (i = 0; i < 6; i++) |
| if (s->mb_num - 1 <= ff_mba_max[i]) |
| break; |
| mb_pos = get_bits(&s->gb, ff_mba_length[i]); |
| s->mb_x = mb_pos % s->mb_width; |
| s->mb_y = mb_pos / s->mb_width; |
| |
| return mb_pos; |
| } |
| |
| /** |
| * Decode the group of blocks header or slice header. |
| * @return <0 if an error occurred |
| */ |
| static int h263_decode_gob_header(MpegEncContext *s) |
| { |
| unsigned int val, gob_number; |
| int left; |
| |
| /* Check for GOB Start Code */ |
| val = show_bits(&s->gb, 16); |
| if(val) |
| return -1; |
| |
| /* We have a GBSC probably with GSTUFF */ |
| skip_bits(&s->gb, 16); /* Drop the zeros */ |
| left= get_bits_left(&s->gb); |
| //MN: we must check the bits left or we might end in a infinite loop (or segfault) |
| for(;left>13; left--){ |
| if(get_bits1(&s->gb)) break; /* Seek the '1' bit */ |
| } |
| if(left<=13) |
| return -1; |
| |
| if(s->h263_slice_structured){ |
| if(check_marker(&s->gb, "before MBA")==0) |
| return -1; |
| |
| ff_h263_decode_mba(s); |
| |
| if(s->mb_num > 1583) |
| if(check_marker(&s->gb, "after MBA")==0) |
| return -1; |
| |
| s->qscale = get_bits(&s->gb, 5); /* SQUANT */ |
| if(check_marker(&s->gb, "after SQUANT")==0) |
| return -1; |
| skip_bits(&s->gb, 2); /* GFID */ |
| }else{ |
| gob_number = get_bits(&s->gb, 5); /* GN */ |
| s->mb_x= 0; |
| s->mb_y= s->gob_index* gob_number; |
| skip_bits(&s->gb, 2); /* GFID */ |
| s->qscale = get_bits(&s->gb, 5); /* GQUANT */ |
| } |
| |
| if(s->mb_y >= s->mb_height) |
| return -1; |
| |
| if(s->qscale==0) |
| return -1; |
| |
| return 0; |
| } |
| |
| /** |
| * Decode the group of blocks / video packet header. |
| * @return bit position of the resync_marker, or <0 if none was found |
| */ |
| int ff_h263_resync(MpegEncContext *s){ |
| int left, pos, ret; |
| |
| if(s->codec_id==AV_CODEC_ID_MPEG4){ |
| skip_bits1(&s->gb); |
| align_get_bits(&s->gb); |
| } |
| |
| if(show_bits(&s->gb, 16)==0){ |
| pos= get_bits_count(&s->gb); |
| if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4) |
| ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data); |
| else |
| ret= h263_decode_gob_header(s); |
| if(ret>=0) |
| return pos; |
| } |
| //OK, it's not where it is supposed to be ... |
| s->gb= s->last_resync_gb; |
| align_get_bits(&s->gb); |
| left= get_bits_left(&s->gb); |
| |
| for(;left>16+1+5+5; left-=8){ |
| if(show_bits(&s->gb, 16)==0){ |
| GetBitContext bak= s->gb; |
| |
| pos= get_bits_count(&s->gb); |
| if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4) |
| ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data); |
| else |
| ret= h263_decode_gob_header(s); |
| if(ret>=0) |
| return pos; |
| |
| s->gb= bak; |
| } |
| skip_bits(&s->gb, 8); |
| } |
| |
| return -1; |
| } |
| |
| int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code) |
| { |
| int code, val, sign, shift; |
| code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2); |
| |
| 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) { |
| val = sign_extend(val, 5 + f_code); |
| } else { |
| /* horrible h263 long vector mode */ |
| if (pred < -31 && val < -63) |
| val += 64; |
| if (pred > 32 && val > 63) |
| val -= 64; |
| |
| } |
| return val; |
| } |
| |
| |
| /* Decode RVLC of H.263+ UMV */ |
| 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); |
| } |
| sign = code & 1; |
| code >>= 1; |
| |
| code = (sign) ? (pred - code) : (pred + code); |
| ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code); |
| return code; |
| |
| } |
| |
| /** |
| * read the next MVs for OBMC. yes this is a ugly hack, feel free to send a patch :) |
| */ |
| 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++; |
| |
| av_assert2(s->pict_type == AV_PICTURE_TYPE_P); |
| |
| do{ |
| if (get_bits1(&s->gb)) { |
| /* skip mb */ |
| mot_val = s->current_picture.motion_val[0][s->block_index[0]]; |
| 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; |
| |
| s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; |
| goto end; |
| } |
| cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); |
| }while(cbpc == 20); |
| |
| if(cbpc & 4){ |
| s->current_picture.mb_type[xy] = MB_TYPE_INTRA; |
| }else{ |
| get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
| 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) { |
| s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0; |
| /* 16x16 motion prediction */ |
| mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); |
| if (s->umvplus) |
| mx = h263p_decode_umotion(s, pred_x); |
| else |
| mx = ff_h263_decode_motion(s, pred_x, 1); |
| |
| if (s->umvplus) |
| my = h263p_decode_umotion(s, pred_y); |
| else |
| my = ff_h263_decode_motion(s, pred_y, 1); |
| |
| 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 { |
| s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0; |
| for(i=0;i<4;i++) { |
| mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); |
| if (s->umvplus) |
| mx = h263p_decode_umotion(s, pred_x); |
| else |
| mx = ff_h263_decode_motion(s, pred_x, 1); |
| |
| if (s->umvplus) |
| my = h263p_decode_umotion(s, pred_y); |
| else |
| my = ff_h263_decode_motion(s, pred_y, 1); |
| 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; |
| } |
| } |
| } |
| 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)) |
| s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ]; |
| else |
| s->qscale= get_bits(&s->gb, 5); |
| }else |
| s->qscale += quant_tab[get_bits(&s->gb, 2)]; |
| ff_set_qscale(s, s->qscale); |
| } |
| |
| static int h263_decode_block(MpegEncContext * s, int16_t * block, |
| int n, int coded) |
| { |
| int level, i, j, run; |
| 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) { |
| rl = &ff_rl_intra_aic; |
| i = 0; |
| if (s->ac_pred) { |
| if (s->h263_aic_dir) |
| scan_table = s->intra_v_scantable.permutated; /* left */ |
| else |
| scan_table = s->intra_h_scantable.permutated; /* top */ |
| } |
| } else if (s->mb_intra) { |
| /* DC coef */ |
| if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) { |
| if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) { |
| int component, diff; |
| component = (n <= 3 ? 0 : n - 4 + 1); |
| level = s->last_dc[component]; |
| if (s->rv10_first_dc_coded[component]) { |
| diff = ff_rv_decode_dc(s, n); |
| if (diff == 0xffff) |
| 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); |
| if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) |
| 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: |
| { |
| OPEN_READER(re, &s->gb); |
| i--; // offset by -1 to allow direct indexing of scan_table |
| for(;;) { |
| 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) { |
| 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; |
| } |
| /* escape */ |
| if (CONFIG_FLV_DECODER && s->h263_flv > 1) { |
| int is11 = SHOW_UBITS(re, &s->gb, 1); |
| SKIP_CACHE(re, &s->gb, 1); |
| run = SHOW_UBITS(re, &s->gb, 7) + 1; |
| if (is11) { |
| SKIP_COUNTER(re, &s->gb, 1 + 7); |
| UPDATE_CACHE(re, &s->gb); |
| level = SHOW_SBITS(re, &s->gb, 11); |
| SKIP_COUNTER(re, &s->gb, 11); |
| } else { |
| SKIP_CACHE(re, &s->gb, 7); |
| level = SHOW_SBITS(re, &s->gb, 7); |
| SKIP_COUNTER(re, &s->gb, 1 + 7 + 7); |
| } |
| } else { |
| run = SHOW_UBITS(re, &s->gb, 7) + 1; |
| SKIP_CACHE(re, &s->gb, 7); |
| level = (int8_t)SHOW_UBITS(re, &s->gb, 8); |
| SKIP_COUNTER(re, &s->gb, 7 + 8); |
| if(level == -128){ |
| UPDATE_CACHE(re, &s->gb); |
| if (s->codec_id == AV_CODEC_ID_RV10) { |
| /* XXX: should patch encoder too */ |
| level = SHOW_SBITS(re, &s->gb, 12); |
| SKIP_COUNTER(re, &s->gb, 12); |
| }else{ |
| level = SHOW_UBITS(re, &s->gb, 5); |
| SKIP_CACHE(re, &s->gb, 5); |
| level |= SHOW_SBITS(re, &s->gb, 6)<<5; |
| SKIP_COUNTER(re, &s->gb, 5 + 6); |
| } |
| } |
| } |
| } else { |
| if (SHOW_UBITS(re, &s->gb, 1)) |
| level = -level; |
| SKIP_COUNTER(re, &s->gb, 1); |
| } |
| i += run; |
| if (i >= 64){ |
| CLOSE_READER(re, &s->gb); |
| // redo update without last flag, revert -1 offset |
| i = i - run + ((run-1)&63) + 1; |
| if (i < 64) { |
| // only last marker, no overrun |
| block[scan_table[i]] = level; |
| break; |
| } |
| 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 ... |
| rl = &ff_rl_intra_aic; |
| i = 0; |
| s->gb= gb; |
| s->bdsp.clear_block(block); |
| 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; |
| } |
| j = scan_table[i]; |
| block[j] = level; |
| } |
| } |
| not_coded: |
| if (s->mb_intra && s->h263_aic) { |
| ff_h263_pred_acdc(s, block, n); |
| i = 63; |
| } |
| s->block_last_index[n] = i; |
| return 0; |
| } |
| |
| static int h263_skip_b_part(MpegEncContext *s, int cbp) |
| { |
| LOCAL_ALIGNED_16(int16_t, dblock, [64]); |
| int i, mbi; |
| int bli[6]; |
| |
| /* 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; |
| memcpy(bli, s->block_last_index, sizeof(bli)); |
| 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; |
| memcpy(s->block_last_index, bli, sizeof(bli)); |
| 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; |
| } |
| |
| int ff_h263_decode_mb(MpegEncContext *s, |
| int16_t block[6][64]) |
| { |
| 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; |
| |
| av_assert2(!s->h263_pred); |
| |
| if (s->pict_type == AV_PICTURE_TYPE_P) { |
| 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; |
| s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; |
| s->mv[0][0][0] = 0; |
| s->mv[0][0][1] = 0; |
| s->mb_skipped = !(s->obmc | s->loop_filter); |
| goto end; |
| } |
| cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2); |
| if (cbpc < 0){ |
| av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y); |
| return -1; |
| } |
| }while(cbpc == 20); |
| |
| s->bdsp.clear_blocks(s->block[0]); |
| |
| 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); |
| cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
| |
| 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) { |
| s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0; |
| /* 16x16 motion prediction */ |
| s->mv_type = MV_TYPE_16X16; |
| ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); |
| if (s->umvplus) |
| mx = h263p_decode_umotion(s, pred_x); |
| else |
| mx = ff_h263_decode_motion(s, pred_x, 1); |
| |
| if (mx >= 0xffff) |
| return -1; |
| |
| if (s->umvplus) |
| my = h263p_decode_umotion(s, pred_y); |
| else |
| my = ff_h263_decode_motion(s, pred_y, 1); |
| |
| if (my >= 0xffff) |
| return -1; |
| 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 { |
| s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0; |
| s->mv_type = MV_TYPE_8X8; |
| for(i=0;i<4;i++) { |
| mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y); |
| if (s->umvplus) |
| mx = h263p_decode_umotion(s, pred_x); |
| else |
| mx = ff_h263_decode_motion(s, pred_x, 1); |
| if (mx >= 0xffff) |
| return -1; |
| |
| if (s->umvplus) |
| my = h263p_decode_umotion(s, pred_y); |
| else |
| my = ff_h263_decode_motion(s, pred_y, 1); |
| if (my >= 0xffff) |
| return -1; |
| 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; |
| } |
| } |
| } else if(s->pict_type==AV_PICTURE_TYPE_B) { |
| int mb_type; |
| const int stride= s->b8_stride; |
| 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)]; |
| // 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{ |
| mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2); |
| 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); |
| return -1; |
| } |
| |
| mb_type= h263_mb_type_b_map[ mb_type ]; |
| }while(!mb_type); |
| |
| s->mb_intra = IS_INTRA(mb_type); |
| if(HAS_CBP(mb_type)){ |
| s->bdsp.clear_blocks(s->block[0]); |
| cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1); |
| if(s->mb_intra){ |
| dquant = IS_QUANT(mb_type); |
| goto intra; |
| } |
| |
| cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
| |
| if (cbpy < 0){ |
| av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y); |
| return -1; |
| } |
| |
| if(s->alt_inter_vlc==0 || (cbpc & 3)!=3) |
| cbpy ^= 0xF; |
| |
| cbp = (cbpc & 3) | (cbpy << 2); |
| }else |
| cbp=0; |
| |
| av_assert2(!s->mb_intra); |
| |
| 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; |
| mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0); |
| }else{ |
| s->mv_dir = 0; |
| s->mv_type= MV_TYPE_16X16; |
| //FIXME UMV |
| |
| if(USES_LIST(mb_type, 0)){ |
| int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my); |
| s->mv_dir = MV_DIR_FORWARD; |
| |
| mx = ff_h263_decode_motion(s, mx, 1); |
| my = ff_h263_decode_motion(s, my, 1); |
| |
| 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)){ |
| int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my); |
| s->mv_dir |= MV_DIR_BACKWARD; |
| |
| mx = ff_h263_decode_motion(s, mx, 1); |
| my = ff_h263_decode_motion(s, my, 1); |
| |
| 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; |
| } |
| } |
| |
| s->current_picture.mb_type[xy] = mb_type; |
| } else { /* I-Frame */ |
| do{ |
| cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2); |
| if (cbpc < 0){ |
| av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y); |
| return -1; |
| } |
| }while(cbpc == 8); |
| |
| s->bdsp.clear_blocks(s->block[0]); |
| |
| dquant = cbpc & 4; |
| s->mb_intra = 1; |
| intra: |
| s->current_picture.mb_type[xy] = MB_TYPE_INTRA; |
| if (s->h263_aic) { |
| s->ac_pred = get_bits1(&s->gb); |
| if(s->ac_pred){ |
| s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED; |
| |
| 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); |
| cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1); |
| if(cbpy<0){ |
| av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y); |
| return -1; |
| } |
| cbp = (cbpc & 3) | (cbpy << 2); |
| if (dquant) { |
| h263_decode_dquant(s); |
| } |
| |
| pb_mv_count += !!s->pb_frame; |
| } |
| |
| while(pb_mv_count--){ |
| ff_h263_decode_motion(s, 0, 1); |
| ff_h263_decode_motion(s, 0, 1); |
| } |
| |
| /* 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){ |
| if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1) |
| preview_obmc(s); |
| } |
| end: |
| |
| /* per-MB end of slice check */ |
| { |
| int v= show_bits(&s->gb, 16); |
| |
| if (get_bits_left(&s->gb) < 16) { |
| v >>= 16 - get_bits_left(&s->gb); |
| } |
| |
| if(v==0) |
| return SLICE_END; |
| } |
| |
| return SLICE_OK; |
| } |
| |
| /* most is hardcoded. should extend to handle all h263 streams */ |
| int ff_h263_decode_picture_header(MpegEncContext *s) |
| { |
| int format, width, height, i, ret; |
| uint32_t startcode; |
| |
| align_get_bits(&s->gb); |
| |
| if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) { |
| av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n"); |
| } |
| |
| 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 */ |
| if( (s->picture_number&~0xFF)+i < s->picture_number) |
| i+= 256; |
| s->picture_number= (s->picture_number&~0xFF) + i; |
| |
| /* PTYPE starts here */ |
| if (check_marker(&s->gb, "in PTYPE") != 1) { |
| return -1; |
| } |
| if (get_bits1(&s->gb) != 0) { |
| av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n"); |
| return -1; /* h263 id */ |
| } |
| 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 */ |
| width = ff_h263_format[format][0]; |
| height = ff_h263_format[format][1]; |
| if (!width) |
| return -1; |
| |
| s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb); |
| |
| s->h263_long_vectors = get_bits1(&s->gb); |
| |
| if (get_bits1(&s->gb) != 0) { |
| av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n"); |
| return -1; /* SAC: off */ |
| } |
| s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */ |
| s->unrestricted_mv = s->h263_long_vectors || s->obmc; |
| |
| 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}; |
| s->avctx->framerate = (AVRational){ 30000, 1001 }; |
| } 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); |
| ff_dlog(s->avctx, "ufep=1, format: %d\n", format); |
| 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); |
| s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter; |
| if(s->avctx->lowres) |
| s->loop_filter = 0; |
| |
| 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){ |
| 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 |
| 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) */ |
| s->aspect_ratio_info = get_bits(&s->gb, 4); |
| ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info); |
| /* 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; |
| check_marker(&s->gb, "in dimensions"); |
| height = get_bits(&s->gb, 9) * 4; |
| ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height); |
| if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) { |
| /* aspected dimensions */ |
| s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8); |
| s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8); |
| }else{ |
| s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info]; |
| } |
| } else { |
| width = ff_h263_format[format][0]; |
| height = ff_h263_format[format][1]; |
| s->avctx->sample_aspect_ratio= (AVRational){12,11}; |
| } |
| s->avctx->sample_aspect_ratio.den <<= s->ehc_mode; |
| if ((width == 0) || (height == 0)) |
| return -1; |
| s->width = width; |
| s->height = height; |
| |
| if(s->custom_pcf){ |
| int gcd; |
| 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){ |
| av_log(s, AV_LOG_ERROR, "zero framerate\n"); |
| return -1; |
| } |
| gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num); |
| s->avctx->framerate.den /= gcd; |
| s->avctx->framerate.num /= gcd; |
| }else{ |
| s->avctx->framerate = (AVRational){ 30000, 1001 }; |
| } |
| } |
| |
| 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"); |
| } |
| } |
| } |
| |
| s->qscale = get_bits(&s->gb, 5); |
| } |
| |
| if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0) |
| return ret; |
| |
| 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 */ |
| } |
| |
| if (s->pict_type!=AV_PICTURE_TYPE_B) { |
| s->time = s->picture_number; |
| s->pp_time = s->time - s->last_non_b_time; |
| s->last_non_b_time = s->time; |
| }else{ |
| 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){ |
| s->pp_time = 2; |
| s->pb_time = 1; |
| } |
| ff_mpeg4_init_direct_mv(s); |
| } |
| |
| /* PEI */ |
| if (skip_1stop_8data_bits(&s->gb) < 0) |
| return AVERROR_INVALIDDATA; |
| |
| if(s->h263_slice_structured){ |
| if (check_marker(&s->gb, "SEPB1") != 1) { |
| return -1; |
| } |
| |
| ff_h263_decode_mba(s); |
| |
| if (check_marker(&s->gb, "SEPB2") != 1) { |
| return -1; |
| } |
| } |
| s->f_code = 1; |
| |
| 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); |
| if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){ |
| 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); |
| v |= get_sbits(&s->gb, 8)<<8; |
| 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; |
| } |
