/* * MSMPEG4 encoder backend * Copyright (c) 2001 Fabrice Bellard * Copyright (c) 2002-2004 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 */ /** * @file * MSMPEG4 encoder backend */ #include <stdint.h> #include <string.h> #include "libavutil/attributes.h" #include "libavutil/avutil.h" #include "libavutil/mem.h" #include "mpegvideo.h" #include "h263.h" #include "mpeg4video.h" #include "msmpeg4.h" #include "msmpeg4data.h" #include "put_bits.h" #include "rl.h" #include "vc1data.h" static uint8_t rl_length[NB_RL_TABLES][MAX_LEVEL+1][MAX_RUN+1][2]; /* build the table which associate a (x,y) motion vector to a vlc */ static av_cold void init_mv_table(MVTable *tab) { int i, x, y; tab->table_mv_index = av_malloc(sizeof(uint16_t) * 4096); /* mark all entries as not used */ for(i=0;i<4096;i++) tab->table_mv_index[i] = tab->n; for(i=0;i<tab->n;i++) { x = tab->table_mvx[i]; y = tab->table_mvy[i]; tab->table_mv_index[(x << 6) | y] = i; } } void ff_msmpeg4_code012(PutBitContext *pb, int n) { if (n == 0) { put_bits(pb, 1, 0); } else { put_bits(pb, 1, 1); put_bits(pb, 1, (n >= 2)); } } static int get_size_of_code(MpegEncContext * s, RLTable *rl, int last, int run, int level, int intra){ int size=0; int code; int run_diff= intra ? 0 : 1; code = get_rl_index(rl, last, run, level); size+= rl->table_vlc[code][1]; if (code == rl->n) { int level1, run1; level1 = level - rl->max_level[last][run]; if (level1 < 1) goto esc2; code = get_rl_index(rl, last, run, level1); if (code == rl->n) { esc2: size++; if (level > MAX_LEVEL) goto esc3; run1 = run - rl->max_run[last][level] - run_diff; if (run1 < 0) goto esc3; code = get_rl_index(rl, last, run1, level); if (code == rl->n) { esc3: /* third escape */ size+=1+1+6+8; } else { /* second escape */ size+= 1+1+ rl->table_vlc[code][1]; } } else { /* first escape */ size+= 1+1+ rl->table_vlc[code][1]; } } else { size++; } return size; } av_cold void ff_msmpeg4_encode_init(MpegEncContext *s) { static int init_done=0; int i; ff_msmpeg4_common_init(s); if(s->msmpeg4_version>=4){ s->min_qcoeff= -255; s->max_qcoeff= 255; } if (!init_done) { /* init various encoding tables */ init_done = 1; init_mv_table(&ff_mv_tables[0]); init_mv_table(&ff_mv_tables[1]); for(i=0;i<NB_RL_TABLES;i++) ff_init_rl(&ff_rl_table[i], ff_static_rl_table_store[i]); for(i=0; i<NB_RL_TABLES; i++){ int level; for (level = 1; level <= MAX_LEVEL; level++) { int run; for(run=0; run<=MAX_RUN; run++){ int last; for(last=0; last<2; last++){ rl_length[i][level][run][last]= get_size_of_code(s, &ff_rl_table[ i], last, run, level, 0); } } } } } } static void find_best_tables(MpegEncContext * s) { int i; int best = 0, best_size = INT_MAX; int chroma_best = 0, best_chroma_size = INT_MAX; for(i=0; i<3; i++){ int level; int chroma_size=0; int size=0; if(i>0){// ;) size++; chroma_size++; } for(level=0; level<=MAX_LEVEL; level++){ int run; for(run=0; run<=MAX_RUN; run++){ int last; const int last_size= size + chroma_size; for(last=0; last<2; last++){ int inter_count = s->ac_stats[0][0][level][run][last] + s->ac_stats[0][1][level][run][last]; int intra_luma_count = s->ac_stats[1][0][level][run][last]; int intra_chroma_count= s->ac_stats[1][1][level][run][last]; if(s->pict_type==AV_PICTURE_TYPE_I){ size += intra_luma_count *rl_length[i ][level][run][last]; chroma_size+= intra_chroma_count*rl_length[i+3][level][run][last]; }else{ size+= intra_luma_count *rl_length[i ][level][run][last] +intra_chroma_count*rl_length[i+3][level][run][last] +inter_count *rl_length[i+3][level][run][last]; } } if(last_size == size+chroma_size) break; } } if(size<best_size){ best_size= size; best= i; } if(chroma_size<best_chroma_size){ best_chroma_size= chroma_size; chroma_best= i; } } if(s->pict_type==AV_PICTURE_TYPE_P) chroma_best= best; memset(s->ac_stats, 0, sizeof(int)*(MAX_LEVEL+1)*(MAX_RUN+1)*2*2*2); s->rl_table_index = best; s->rl_chroma_table_index= chroma_best; if(s->pict_type != s->last_non_b_pict_type){ s->rl_table_index= 2; if(s->pict_type==AV_PICTURE_TYPE_I) s->rl_chroma_table_index= 1; else s->rl_chroma_table_index= 2; } } /* write MSMPEG4 compatible frame header */ void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number) { find_best_tables(s); avpriv_align_put_bits(&s->pb); put_bits(&s->pb, 2, s->pict_type - 1); put_bits(&s->pb, 5, s->qscale); if(s->msmpeg4_version<=2){ s->rl_table_index = 2; s->rl_chroma_table_index = 2; } s->dc_table_index = 1; s->mv_table_index = 1; /* only if P frame */ s->use_skip_mb_code = 1; /* only if P frame */ s->per_mb_rl_table = 0; if(s->msmpeg4_version==4) s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE && s->pict_type==AV_PICTURE_TYPE_P); av_dlog(s, "%d %d %d %d %d\n", s->pict_type, s->bit_rate, s->inter_intra_pred, s->width, s->height); if (s->pict_type == AV_PICTURE_TYPE_I) { s->slice_height= s->mb_height/1; put_bits(&s->pb, 5, 0x16 + s->mb_height/s->slice_height); if(s->msmpeg4_version==4){ ff_msmpeg4_encode_ext_header(s); if(s->bit_rate>MBAC_BITRATE) put_bits(&s->pb, 1, s->per_mb_rl_table); } if(s->msmpeg4_version>2){ if(!s->per_mb_rl_table){ ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index); ff_msmpeg4_code012(&s->pb, s->rl_table_index); } put_bits(&s->pb, 1, s->dc_table_index); } } else { put_bits(&s->pb, 1, s->use_skip_mb_code); if(s->msmpeg4_version==4 && s->bit_rate>MBAC_BITRATE) put_bits(&s->pb, 1, s->per_mb_rl_table); if(s->msmpeg4_version>2){ if(!s->per_mb_rl_table) ff_msmpeg4_code012(&s->pb, s->rl_table_index); put_bits(&s->pb, 1, s->dc_table_index); put_bits(&s->pb, 1, s->mv_table_index); } } s->esc3_level_length= 0; s->esc3_run_length= 0; } void ff_msmpeg4_encode_ext_header(MpegEncContext * s) { unsigned fps = s->avctx->time_base.den / s->avctx->time_base.num / FFMAX(s->avctx->ticks_per_frame, 1); put_bits(&s->pb, 5, FFMIN(fps, 31)); //yes 29.97 -> 29 put_bits(&s->pb, 11, FFMIN(s->bit_rate/1024, 2047)); if(s->msmpeg4_version>=3) put_bits(&s->pb, 1, s->flipflop_rounding); else av_assert0(s->flipflop_rounding==0); } void ff_msmpeg4_encode_motion(MpegEncContext * s, int mx, int my) { int code; MVTable *mv; /* modulo encoding */ /* WARNING : you cannot reach all the MVs even with the modulo encoding. This is a somewhat strange compromise they took !!! */ if (mx <= -64) mx += 64; else if (mx >= 64) mx -= 64; if (my <= -64) my += 64; else if (my >= 64) my -= 64; mx += 32; my += 32; #if 0 if ((unsigned)mx >= 64 || (unsigned)my >= 64) av_log(s->avctx, AV_LOG_ERROR, "error mx=%d my=%d\n", mx, my); #endif mv = &ff_mv_tables[s->mv_table_index]; code = mv->table_mv_index[(mx << 6) | my]; put_bits(&s->pb, mv->table_mv_bits[code], mv->table_mv_code[code]); if (code == mv->n) { /* escape : code literally */ put_bits(&s->pb, 6, mx); put_bits(&s->pb, 6, my); } } void ff_msmpeg4_handle_slices(MpegEncContext *s){ if (s->mb_x == 0) { if (s->slice_height && (s->mb_y % s->slice_height) == 0) { if(s->msmpeg4_version < 4){ ff_mpeg4_clean_buffers(s); } s->first_slice_line = 1; } else { s->first_slice_line = 0; } } } static void msmpeg4v2_encode_motion(MpegEncContext * s, int val) { int range, bit_size, sign, code, bits; if (val == 0) { /* zero vector */ code = 0; put_bits(&s->pb, ff_mvtab[code][1], ff_mvtab[code][0]); } else { bit_size = s->f_code - 1; range = 1 << bit_size; if (val <= -64) val += 64; else if (val >= 64) val -= 64; if (val >= 0) { sign = 0; } else { val = -val; sign = 1; } val--; code = (val >> bit_size) + 1; bits = val & (range - 1); put_bits(&s->pb, ff_mvtab[code][1] + 1, (ff_mvtab[code][0] << 1) | sign); if (bit_size > 0) { put_bits(&s->pb, bit_size, bits); } } } void ff_msmpeg4_encode_mb(MpegEncContext * s, int16_t block[6][64], int motion_x, int motion_y) { int cbp, coded_cbp, i; int pred_x, pred_y; uint8_t *coded_block; ff_msmpeg4_handle_slices(s); if (!s->mb_intra) { /* compute cbp */ cbp = 0; for (i = 0; i < 6; i++) { if (s->block_last_index[i] >= 0) cbp |= 1 << (5 - i); } if (s->use_skip_mb_code && (cbp | motion_x | motion_y) == 0) { /* skip macroblock */ put_bits(&s->pb, 1, 1); s->last_bits++; s->misc_bits++; s->skip_count++; return; } if (s->use_skip_mb_code) put_bits(&s->pb, 1, 0); /* mb coded */ if(s->msmpeg4_version<=2){ put_bits(&s->pb, ff_v2_mb_type[cbp&3][1], ff_v2_mb_type[cbp&3][0]); if((cbp&3) != 3) coded_cbp= cbp ^ 0x3C; else coded_cbp= cbp; put_bits(&s->pb, ff_h263_cbpy_tab[coded_cbp>>2][1], ff_h263_cbpy_tab[coded_cbp>>2][0]); s->misc_bits += get_bits_diff(s); ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); msmpeg4v2_encode_motion(s, motion_x - pred_x); msmpeg4v2_encode_motion(s, motion_y - pred_y); }else{ put_bits(&s->pb, ff_table_mb_non_intra[cbp + 64][1], ff_table_mb_non_intra[cbp + 64][0]); s->misc_bits += get_bits_diff(s); /* motion vector */ ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y); ff_msmpeg4_encode_motion(s, motion_x - pred_x, motion_y - pred_y); } s->mv_bits += get_bits_diff(s); for (i = 0; i < 6; i++) { ff_msmpeg4_encode_block(s, block[i], i); } s->p_tex_bits += get_bits_diff(s); } else { /* compute cbp */ cbp = 0; coded_cbp = 0; for (i = 0; i < 6; i++) { int val, pred; val = (s->block_last_index[i] >= 1); cbp |= val << (5 - i); if (i < 4) { /* predict value for close blocks only for luma */ pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block); *coded_block = val; val = val ^ pred; } coded_cbp |= val << (5 - i); } if(s->msmpeg4_version<=2){ if (s->pict_type == AV_PICTURE_TYPE_I) { put_bits(&s->pb, ff_v2_intra_cbpc[cbp&3][1], ff_v2_intra_cbpc[cbp&3][0]); } else { if (s->use_skip_mb_code) put_bits(&s->pb, 1, 0); /* mb coded */ put_bits(&s->pb, ff_v2_mb_type[(cbp&3) + 4][1], ff_v2_mb_type[(cbp&3) + 4][0]); } put_bits(&s->pb, 1, 0); /* no AC prediction yet */ put_bits(&s->pb, ff_h263_cbpy_tab[cbp>>2][1], ff_h263_cbpy_tab[cbp>>2][0]); }else{ if (s->pict_type == AV_PICTURE_TYPE_I) { put_bits(&s->pb, ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]); } else { if (s->use_skip_mb_code) put_bits(&s->pb, 1, 0); /* mb coded */ put_bits(&s->pb, ff_table_mb_non_intra[cbp][1], ff_table_mb_non_intra[cbp][0]); } put_bits(&s->pb, 1, 0); /* no AC prediction yet */ if(s->inter_intra_pred){ s->h263_aic_dir=0; put_bits(&s->pb, ff_table_inter_intra[s->h263_aic_dir][1], ff_table_inter_intra[s->h263_aic_dir][0]); } } s->misc_bits += get_bits_diff(s); for (i = 0; i < 6; i++) { ff_msmpeg4_encode_block(s, block[i], i); } s->i_tex_bits += get_bits_diff(s); s->i_count++; } } static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr) { int sign, code; int pred, av_uninit(extquant); int extrabits = 0; int16_t *dc_val; pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr); /* update predictor */ if (n < 4) { *dc_val = level * s->y_dc_scale; } else { *dc_val = level * s->c_dc_scale; } /* do the prediction */ level -= pred; if(s->msmpeg4_version<=2){ if (n < 4) { put_bits(&s->pb, ff_v2_dc_lum_table[level + 256][1], ff_v2_dc_lum_table[level + 256][0]); }else{ put_bits(&s->pb, ff_v2_dc_chroma_table[level + 256][1], ff_v2_dc_chroma_table[level + 256][0]); } }else{ sign = 0; if (level < 0) { level = -level; sign = 1; } code = level; if (code > DC_MAX) code = DC_MAX; else if( s->msmpeg4_version>=6 ) { if( s->qscale == 1 ) { extquant = (level + 3) & 0x3; code = ((level+3)>>2); } else if( s->qscale == 2 ) { extquant = (level + 1) & 0x1; code = ((level+1)>>1); } } if (s->dc_table_index == 0) { if (n < 4) { put_bits(&s->pb, ff_table0_dc_lum[code][1], ff_table0_dc_lum[code][0]); } else { put_bits(&s->pb, ff_table0_dc_chroma[code][1], ff_table0_dc_chroma[code][0]); } } else { if (n < 4) { put_bits(&s->pb, ff_table1_dc_lum[code][1], ff_table1_dc_lum[code][0]); } else { put_bits(&s->pb, ff_table1_dc_chroma[code][1], ff_table1_dc_chroma[code][0]); } } if(s->msmpeg4_version>=6 && s->qscale<=2) extrabits = 3 - s->qscale; if (code == DC_MAX) put_bits(&s->pb, 8 + extrabits, level); else if(extrabits > 0)//== VC1 && s->qscale<=2 put_bits(&s->pb, extrabits, extquant); if (level != 0) { put_bits(&s->pb, 1, sign); } } } /* Encoding of a block. Very similar to MPEG4 except for a different escape coding (same as H263) and more vlc tables. */ void ff_msmpeg4_encode_block(MpegEncContext * s, int16_t * block, int n) { int level, run, last, i, j, last_index; int last_non_zero, sign, slevel; int code, run_diff, dc_pred_dir; const RLTable *rl; const uint8_t *scantable; if (s->mb_intra) { msmpeg4_encode_dc(s, block[0], n, &dc_pred_dir); i = 1; if (n < 4) { rl = &ff_rl_table[s->rl_table_index]; } else { rl = &ff_rl_table[3 + s->rl_chroma_table_index]; } run_diff = s->msmpeg4_version>=4; scantable= s->intra_scantable.permutated; } else { i = 0; rl = &ff_rl_table[3 + s->rl_table_index]; if(s->msmpeg4_version<=2) run_diff = 0; else run_diff = 1; scantable= s->inter_scantable.permutated; } /* recalculate block_last_index for M$ wmv1 */ if(s->msmpeg4_version>=4 && s->msmpeg4_version<6 && s->block_last_index[n]>0){ for(last_index=63; last_index>=0; last_index--){ if(block[scantable[last_index]]) break; } s->block_last_index[n]= last_index; }else last_index = s->block_last_index[n]; /* AC coefs */ last_non_zero = i - 1; for (; i <= last_index; i++) { j = scantable[i]; level = block[j]; if (level) { run = i - last_non_zero - 1; last = (i == last_index); sign = 0; slevel = level; if (level < 0) { sign = 1; level = -level; } if(level<=MAX_LEVEL && run<=MAX_RUN){ s->ac_stats[s->mb_intra][n>3][level][run][last]++; } s->ac_stats[s->mb_intra][n > 3][40][63][0]++; //esc3 like code = get_rl_index(rl, last, run, level); put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]); if (code == rl->n) { int level1, run1; level1 = level - rl->max_level[last][run]; if (level1 < 1) goto esc2; code = get_rl_index(rl, last, run, level1); if (code == rl->n) { esc2: put_bits(&s->pb, 1, 0); if (level > MAX_LEVEL) goto esc3; run1 = run - rl->max_run[last][level] - run_diff; if (run1 < 0) goto esc3; code = get_rl_index(rl, last, run1+1, level); if (s->msmpeg4_version == 4 && code == rl->n) goto esc3; code = get_rl_index(rl, last, run1, level); if (code == rl->n) { esc3: /* third escape */ put_bits(&s->pb, 1, 0); put_bits(&s->pb, 1, last); if(s->msmpeg4_version>=4){ if(s->esc3_level_length==0){ s->esc3_level_length=8; s->esc3_run_length= 6; //ESCLVLSZ + ESCRUNSZ if(s->qscale<8) put_bits(&s->pb, 6 + (s->msmpeg4_version>=6), 3); else put_bits(&s->pb, 8, 3); } put_bits(&s->pb, s->esc3_run_length, run); put_bits(&s->pb, 1, sign); put_bits(&s->pb, s->esc3_level_length, level); }else{ put_bits(&s->pb, 6, run); put_sbits(&s->pb, 8, slevel); } } else { /* second escape */ put_bits(&s->pb, 1, 1); put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]); put_bits(&s->pb, 1, sign); } } else { /* first escape */ put_bits(&s->pb, 1, 1); put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]); put_bits(&s->pb, 1, sign); } } else { put_bits(&s->pb, 1, sign); } last_non_zero = i; } } }