diff options
author | Michael Niedermayer <michaelni@gmx.at> | 2010-01-09 17:59:06 +0300 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2010-01-09 17:59:06 +0300 |
commit | fc53b6afee7cdf1b9125d2c5a43f3fe879d85f24 (patch) | |
tree | 59702e5f2da9f289c6985a3a213602964716ad50 /libavcodec/ituh263enc.c | |
parent | 4b19045566d5b67be200eebb4eba577c865d133a (diff) |
Split H263 encoder and decoder from common code.
Originally committed as revision 21109 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/ituh263enc.c')
-rw-r--r-- | libavcodec/ituh263enc.c | 857 |
1 files changed, 857 insertions, 0 deletions
diff --git a/libavcodec/ituh263enc.c b/libavcodec/ituh263enc.c new file mode 100644 index 0000000000..ce64497984 --- /dev/null +++ b/libavcodec/ituh263enc.c @@ -0,0 +1,857 @@ +/* + * ITU H263 bitstream encoder + * 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 libavcodec/ituh263enc.c + * h263 encoder. + */ + +//#define DEBUG +#include <limits.h> + +#include "dsputil.h" +#include "avcodec.h" +#include "mpegvideo.h" +#include "h263.h" +#include "mathops.h" +#include "unary.h" +#include "flv.h" +#include "mpeg4video.h" + +//#undef NDEBUG +//#include <assert.h> + +/** + * Table of number of bits a motion vector component needs. + */ +static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1]; + +/** + * Minimal fcode that a motion vector component would need. + */ +static uint8_t fcode_tab[MAX_MV*2+1]; + +/** + * Minimal fcode that a motion vector component would need in umv. + * All entries in this table are 1. + */ +static uint8_t umv_fcode_tab[MAX_MV*2+1]; + +//unified encoding tables for run length encoding of coefficients +//unified in the sense that the specification specifies the encoding in several steps. +static uint8_t uni_h263_intra_aic_rl_len [64*64*2*2]; +static uint8_t uni_h263_inter_rl_len [64*64*2*2]; +//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level)) +//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64) +#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level)) + +static const uint8_t wrong_run[102] = { + 1, 2, 3, 5, 4, 10, 9, 8, +11, 15, 17, 16, 23, 22, 21, 20, +19, 18, 25, 24, 27, 26, 11, 7, + 6, 1, 2, 13, 2, 2, 2, 2, + 6, 12, 3, 9, 1, 3, 4, 3, + 7, 4, 1, 1, 5, 5, 14, 6, + 1, 7, 1, 8, 1, 1, 1, 1, +10, 1, 1, 5, 9, 17, 25, 24, +29, 33, 32, 41, 2, 23, 28, 31, + 3, 22, 30, 4, 27, 40, 8, 26, + 6, 39, 7, 38, 16, 37, 15, 10, +11, 12, 13, 14, 1, 21, 20, 18, +19, 2, 1, 34, 35, 36 +}; + +int h263_get_picture_format(int width, int height) +{ + if (width == 128 && height == 96) + return 1; + else if (width == 176 && height == 144) + return 2; + else if (width == 352 && height == 288) + return 3; + else if (width == 704 && height == 576) + return 4; + else if (width == 1408 && height == 1152) + return 5; + else + return 7; +} + +/** + * Returns the 4 bit value that specifies the given aspect ratio. + * This may be one of the standard aspect ratios or it specifies + * that the aspect will be stored explicitly later. + */ +av_const int ff_h263_aspect_to_info(AVRational aspect){ + int i; + + if(aspect.num==0) aspect= (AVRational){1,1}; + + for(i=1; i<6; i++){ + if(av_cmp_q(ff_h263_pixel_aspect[i], aspect) == 0){ + return i; + } + } + + return FF_ASPECT_EXTENDED; +} + +void h263_encode_picture_header(MpegEncContext * s, int picture_number) +{ + int format, coded_frame_rate, coded_frame_rate_base, i, temp_ref; + int best_clock_code=1; + int best_divisor=60; + int best_error= INT_MAX; + + if(s->h263_plus){ + for(i=0; i<2; i++){ + int div, error; + div= (s->avctx->time_base.num*1800000LL + 500LL*s->avctx->time_base.den) / ((1000LL+i)*s->avctx->time_base.den); + div= av_clip(div, 1, 127); + error= FFABS(s->avctx->time_base.num*1800000LL - (1000LL+i)*s->avctx->time_base.den*div); + if(error < best_error){ + best_error= error; + best_divisor= div; + best_clock_code= i; + } + } + } + s->custom_pcf= best_clock_code!=1 || best_divisor!=60; + coded_frame_rate= 1800000; + coded_frame_rate_base= (1000+best_clock_code)*best_divisor; + + align_put_bits(&s->pb); + + /* Update the pointer to last GOB */ + s->ptr_lastgob = put_bits_ptr(&s->pb); + put_bits(&s->pb, 22, 0x20); /* PSC */ + temp_ref= s->picture_number * (int64_t)coded_frame_rate * s->avctx->time_base.num / //FIXME use timestamp + (coded_frame_rate_base * (int64_t)s->avctx->time_base.den); + put_sbits(&s->pb, 8, temp_ref); /* TemporalReference */ + + put_bits(&s->pb, 1, 1); /* marker */ + put_bits(&s->pb, 1, 0); /* h263 id */ + put_bits(&s->pb, 1, 0); /* split screen off */ + put_bits(&s->pb, 1, 0); /* camera off */ + put_bits(&s->pb, 1, 0); /* freeze picture release off */ + + format = h263_get_picture_format(s->width, s->height); + if (!s->h263_plus) { + /* H.263v1 */ + put_bits(&s->pb, 3, format); + put_bits(&s->pb, 1, (s->pict_type == FF_P_TYPE)); + /* By now UMV IS DISABLED ON H.263v1, since the restrictions + of H.263v1 UMV implies to check the predicted MV after + calculation of the current MB to see if we're on the limits */ + put_bits(&s->pb, 1, 0); /* Unrestricted Motion Vector: off */ + put_bits(&s->pb, 1, 0); /* SAC: off */ + put_bits(&s->pb, 1, s->obmc); /* Advanced Prediction */ + put_bits(&s->pb, 1, 0); /* only I/P frames, no PB frame */ + put_bits(&s->pb, 5, s->qscale); + put_bits(&s->pb, 1, 0); /* Continuous Presence Multipoint mode: off */ + } else { + int ufep=1; + /* H.263v2 */ + /* H.263 Plus PTYPE */ + + put_bits(&s->pb, 3, 7); + put_bits(&s->pb,3,ufep); /* Update Full Extended PTYPE */ + if (format == 7) + put_bits(&s->pb,3,6); /* Custom Source Format */ + else + put_bits(&s->pb, 3, format); + + put_bits(&s->pb,1, s->custom_pcf); + put_bits(&s->pb,1, s->umvplus); /* Unrestricted Motion Vector */ + put_bits(&s->pb,1,0); /* SAC: off */ + put_bits(&s->pb,1,s->obmc); /* Advanced Prediction Mode */ + put_bits(&s->pb,1,s->h263_aic); /* Advanced Intra Coding */ + put_bits(&s->pb,1,s->loop_filter); /* Deblocking Filter */ + put_bits(&s->pb,1,s->h263_slice_structured); /* Slice Structured */ + put_bits(&s->pb,1,0); /* Reference Picture Selection: off */ + put_bits(&s->pb,1,0); /* Independent Segment Decoding: off */ + put_bits(&s->pb,1,s->alt_inter_vlc); /* Alternative Inter VLC */ + put_bits(&s->pb,1,s->modified_quant); /* Modified Quantization: */ + put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */ + put_bits(&s->pb,3,0); /* Reserved */ + + put_bits(&s->pb, 3, s->pict_type == FF_P_TYPE); + + put_bits(&s->pb,1,0); /* Reference Picture Resampling: off */ + put_bits(&s->pb,1,0); /* Reduced-Resolution Update: off */ + put_bits(&s->pb,1,s->no_rounding); /* Rounding Type */ + put_bits(&s->pb,2,0); /* Reserved */ + put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */ + + /* This should be here if PLUSPTYPE */ + put_bits(&s->pb, 1, 0); /* Continuous Presence Multipoint mode: off */ + + if (format == 7) { + /* Custom Picture Format (CPFMT) */ + s->aspect_ratio_info= ff_h263_aspect_to_info(s->avctx->sample_aspect_ratio); + + put_bits(&s->pb,4,s->aspect_ratio_info); + put_bits(&s->pb,9,(s->width >> 2) - 1); + put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */ + put_bits(&s->pb,9,(s->height >> 2)); + if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){ + put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num); + put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den); + } + } + if(s->custom_pcf){ + if(ufep){ + put_bits(&s->pb, 1, best_clock_code); + put_bits(&s->pb, 7, best_divisor); + } + put_sbits(&s->pb, 2, temp_ref>>8); + } + + /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */ + if (s->umvplus) +// put_bits(&s->pb,1,1); /* Limited according tables of Annex D */ +//FIXME check actual requested range + put_bits(&s->pb,2,1); /* unlimited */ + if(s->h263_slice_structured) + put_bits(&s->pb,2,0); /* no weird submodes */ + + put_bits(&s->pb, 5, s->qscale); + } + + put_bits(&s->pb, 1, 0); /* no PEI */ + + if(s->h263_slice_structured){ + put_bits(&s->pb, 1, 1); + + assert(s->mb_x == 0 && s->mb_y == 0); + ff_h263_encode_mba(s); + + put_bits(&s->pb, 1, 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; + } +} + +/** + * Encodes a group of blocks header. + */ +void h263_encode_gob_header(MpegEncContext * s, int mb_line) +{ + put_bits(&s->pb, 17, 1); /* GBSC */ + + if(s->h263_slice_structured){ + put_bits(&s->pb, 1, 1); + + ff_h263_encode_mba(s); + + if(s->mb_num > 1583) + put_bits(&s->pb, 1, 1); + put_bits(&s->pb, 5, s->qscale); /* GQUANT */ + put_bits(&s->pb, 1, 1); + put_bits(&s->pb, 2, s->pict_type == FF_I_TYPE); /* GFID */ + }else{ + int gob_number= mb_line / s->gob_index; + + put_bits(&s->pb, 5, gob_number); /* GN */ + put_bits(&s->pb, 2, s->pict_type == FF_I_TYPE); /* GFID */ + put_bits(&s->pb, 5, s->qscale); /* GQUANT */ + } +} + +/** + * modify qscale so that encoding is acually possible in h263 (limit difference to -2..2) + */ +void ff_clean_h263_qscales(MpegEncContext *s){ + int i; + int8_t * const qscale_table= s->current_picture.qscale_table; + + ff_init_qscale_tab(s); + + for(i=1; i<s->mb_num; i++){ + if(qscale_table[ s->mb_index2xy[i] ] - qscale_table[ s->mb_index2xy[i-1] ] >2) + qscale_table[ s->mb_index2xy[i] ]= qscale_table[ s->mb_index2xy[i-1] ]+2; + } + for(i=s->mb_num-2; i>=0; i--){ + if(qscale_table[ s->mb_index2xy[i] ] - qscale_table[ s->mb_index2xy[i+1] ] >2) + qscale_table[ s->mb_index2xy[i] ]= qscale_table[ s->mb_index2xy[i+1] ]+2; + } + + if(s->codec_id != CODEC_ID_H263P){ + for(i=1; i<s->mb_num; i++){ + int mb_xy= s->mb_index2xy[i]; + + if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTER4V)){ + s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_INTER; + } + } + } +} + +static const int dquant_code[5]= {1,0,9,2,3}; + +/** + * encodes a 8x8 block. + * @param block the 8x8 block + * @param n block index (0-3 are luma, 4-5 are chroma) + */ +static void h263_encode_block(MpegEncContext * s, DCTELEM * block, int n) +{ + int level, run, last, i, j, last_index, last_non_zero, sign, slevel, code; + RLTable *rl; + + rl = &ff_h263_rl_inter; + if (s->mb_intra && !s->h263_aic) { + /* DC coef */ + level = block[0]; + /* 255 cannot be represented, so we clamp */ + if (level > 254) { + level = 254; + block[0] = 254; + } + /* 0 cannot be represented also */ + else if (level < 1) { + level = 1; + block[0] = 1; + } + if (level == 128) //FIXME check rv10 + put_bits(&s->pb, 8, 0xff); + else + put_bits(&s->pb, 8, level); + i = 1; + } else { + i = 0; + if (s->h263_aic && s->mb_intra) + rl = &rl_intra_aic; + + if(s->alt_inter_vlc && !s->mb_intra){ + int aic_vlc_bits=0; + int inter_vlc_bits=0; + int wrong_pos=-1; + int aic_code; + + last_index = s->block_last_index[n]; + last_non_zero = i - 1; + for (; i <= last_index; i++) { + j = s->intra_scantable.permutated[i]; + level = block[j]; + if (level) { + run = i - last_non_zero - 1; + last = (i == last_index); + + if(level<0) level= -level; + + code = get_rl_index(rl, last, run, level); + aic_code = get_rl_index(&rl_intra_aic, last, run, level); + inter_vlc_bits += rl->table_vlc[code][1]+1; + aic_vlc_bits += rl_intra_aic.table_vlc[aic_code][1]+1; + + if (code == rl->n) { + inter_vlc_bits += 1+6+8-1; + } + if (aic_code == rl_intra_aic.n) { + aic_vlc_bits += 1+6+8-1; + wrong_pos += run + 1; + }else + wrong_pos += wrong_run[aic_code]; + last_non_zero = i; + } + } + i = 0; + if(aic_vlc_bits < inter_vlc_bits && wrong_pos > 63) + rl = &rl_intra_aic; + } + } + + /* AC coefs */ + last_index = s->block_last_index[n]; + last_non_zero = i - 1; + for (; i <= last_index; i++) { + j = s->intra_scantable.permutated[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; + } + 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) { + if(!CONFIG_FLV_ENCODER || s->h263_flv <= 1){ + put_bits(&s->pb, 1, last); + put_bits(&s->pb, 6, run); + + assert(slevel != 0); + + if(level < 128) + put_sbits(&s->pb, 8, slevel); + else{ + put_bits(&s->pb, 8, 128); + put_sbits(&s->pb, 5, slevel); + put_sbits(&s->pb, 6, slevel>>5); + } + }else{ + ff_flv2_encode_ac_esc(&s->pb, slevel, level, run, last); + } + } else { + put_bits(&s->pb, 1, sign); + } + last_non_zero = i; + } + } +} + +/* Encode MV differences on H.263+ with Unrestricted MV mode */ +static void h263p_encode_umotion(MpegEncContext * s, int val) +{ + short sval = 0; + short i = 0; + short n_bits = 0; + short temp_val; + int code = 0; + int tcode; + + if ( val == 0) + put_bits(&s->pb, 1, 1); + else if (val == 1) + put_bits(&s->pb, 3, 0); + else if (val == -1) + put_bits(&s->pb, 3, 2); + else { + + sval = ((val < 0) ? (short)(-val):(short)val); + temp_val = sval; + + while (temp_val != 0) { + temp_val = temp_val >> 1; + n_bits++; + } + + i = n_bits - 1; + while (i > 0) { + tcode = (sval & (1 << (i-1))) >> (i-1); + tcode = (tcode << 1) | 1; + code = (code << 2) | tcode; + i--; + } + code = ((code << 1) | (val < 0)) << 1; + put_bits(&s->pb, (2*n_bits)+1, code); + } +} + +void h263_encode_mb(MpegEncContext * s, + DCTELEM block[6][64], + int motion_x, int motion_y) +{ + int cbpc, cbpy, i, cbp, pred_x, pred_y; + int16_t pred_dc; + int16_t rec_intradc[6]; + int16_t *dc_ptr[6]; + const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1); + + if (!s->mb_intra) { + /* compute cbp */ + cbp= get_p_cbp(s, block, motion_x, motion_y); + + if ((cbp | motion_x | motion_y | s->dquant | (s->mv_type - MV_TYPE_16X16)) == 0) { + /* skip macroblock */ + put_bits(&s->pb, 1, 1); + if(interleaved_stats){ + s->misc_bits++; + s->last_bits++; + } + s->skip_count++; + + return; + } + put_bits(&s->pb, 1, 0); /* mb coded */ + + cbpc = cbp & 3; + cbpy = cbp >> 2; + if(s->alt_inter_vlc==0 || cbpc!=3) + cbpy ^= 0xF; + if(s->dquant) cbpc+= 8; + if(s->mv_type==MV_TYPE_16X16){ + put_bits(&s->pb, + ff_h263_inter_MCBPC_bits[cbpc], + ff_h263_inter_MCBPC_code[cbpc]); + + put_bits(&s->pb, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]); + if(s->dquant) + put_bits(&s->pb, 2, dquant_code[s->dquant+2]); + + if(interleaved_stats){ + s->misc_bits+= get_bits_diff(s); + } + + /* motion vectors: 16x16 mode */ + h263_pred_motion(s, 0, 0, &pred_x, &pred_y); + + if (!s->umvplus) { + ff_h263_encode_motion_vector(s, motion_x - pred_x, + motion_y - pred_y, 1); + } + else { + h263p_encode_umotion(s, motion_x - pred_x); + h263p_encode_umotion(s, motion_y - pred_y); + if (((motion_x - pred_x) == 1) && ((motion_y - pred_y) == 1)) + /* To prevent Start Code emulation */ + put_bits(&s->pb,1,1); + } + }else{ + put_bits(&s->pb, + ff_h263_inter_MCBPC_bits[cbpc+16], + ff_h263_inter_MCBPC_code[cbpc+16]); + put_bits(&s->pb, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]); + if(s->dquant) + put_bits(&s->pb, 2, dquant_code[s->dquant+2]); + + if(interleaved_stats){ + s->misc_bits+= get_bits_diff(s); + } + + for(i=0; i<4; i++){ + /* motion vectors: 8x8 mode*/ + h263_pred_motion(s, i, 0, &pred_x, &pred_y); + + motion_x= s->current_picture.motion_val[0][ s->block_index[i] ][0]; + motion_y= s->current_picture.motion_val[0][ s->block_index[i] ][1]; + if (!s->umvplus) { + ff_h263_encode_motion_vector(s, motion_x - pred_x, + motion_y - pred_y, 1); + } + else { + h263p_encode_umotion(s, motion_x - pred_x); + h263p_encode_umotion(s, motion_y - pred_y); + if (((motion_x - pred_x) == 1) && ((motion_y - pred_y) == 1)) + /* To prevent Start Code emulation */ + put_bits(&s->pb,1,1); + } + } + } + + if(interleaved_stats){ + s->mv_bits+= get_bits_diff(s); + } + } else { + assert(s->mb_intra); + + cbp = 0; + if (s->h263_aic) { + /* Predict DC */ + for(i=0; i<6; i++) { + int16_t level = block[i][0]; + int scale; + + if(i<4) scale= s->y_dc_scale; + else scale= s->c_dc_scale; + + pred_dc = h263_pred_dc(s, i, &dc_ptr[i]); + level -= pred_dc; + /* Quant */ + if (level >= 0) + level = (level + (scale>>1))/scale; + else + level = (level - (scale>>1))/scale; + + /* AIC can change CBP */ + if (level == 0 && s->block_last_index[i] == 0) + s->block_last_index[i] = -1; + + if(!s->modified_quant){ + if (level < -127) + level = -127; + else if (level > 127) + level = 127; + } + + block[i][0] = level; + /* Reconstruction */ + rec_intradc[i] = scale*level + pred_dc; + /* Oddify */ + rec_intradc[i] |= 1; + //if ((rec_intradc[i] % 2) == 0) + // rec_intradc[i]++; + /* Clipping */ + if (rec_intradc[i] < 0) + rec_intradc[i] = 0; + else if (rec_intradc[i] > 2047) + rec_intradc[i] = 2047; + + /* Update AC/DC tables */ + *dc_ptr[i] = rec_intradc[i]; + if (s->block_last_index[i] >= 0) + cbp |= 1 << (5 - i); + } + }else{ + for(i=0; i<6; i++) { + /* compute cbp */ + if (s->block_last_index[i] >= 1) + cbp |= 1 << (5 - i); + } + } + + cbpc = cbp & 3; + if (s->pict_type == FF_I_TYPE) { + if(s->dquant) cbpc+=4; + put_bits(&s->pb, + ff_h263_intra_MCBPC_bits[cbpc], + ff_h263_intra_MCBPC_code[cbpc]); + } else { + if(s->dquant) cbpc+=8; + put_bits(&s->pb, 1, 0); /* mb coded */ + put_bits(&s->pb, + ff_h263_inter_MCBPC_bits[cbpc + 4], + ff_h263_inter_MCBPC_code[cbpc + 4]); + } + if (s->h263_aic) { + /* XXX: currently, we do not try to use ac prediction */ + put_bits(&s->pb, 1, 0); /* no AC prediction */ + } + cbpy = cbp >> 2; + put_bits(&s->pb, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]); + if(s->dquant) + put_bits(&s->pb, 2, dquant_code[s->dquant+2]); + + if(interleaved_stats){ + s->misc_bits+= get_bits_diff(s); + } + } + + for(i=0; i<6; i++) { + /* encode each block */ + h263_encode_block(s, block[i], i); + + /* Update INTRADC for decoding */ + if (s->h263_aic && s->mb_intra) { + block[i][0] = rec_intradc[i]; + + } + } + + if(interleaved_stats){ + if (!s->mb_intra) { + s->p_tex_bits+= get_bits_diff(s); + s->f_count++; + }else{ + s->i_tex_bits+= get_bits_diff(s); + s->i_count++; + } + } +} + +void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code) +{ + int range, l, bit_size, sign, code, bits; + + if (val == 0) { + /* zero vector */ + code = 0; + put_bits(&s->pb, mvtab[code][1], mvtab[code][0]); + } else { + bit_size = f_code - 1; + range = 1 << bit_size; + /* modulo encoding */ + l= INT_BIT - 6 - bit_size; + val = (val<<l)>>l; + sign = val>>31; + val= (val^sign)-sign; + sign&=1; + + val--; + code = (val >> bit_size) + 1; + bits = val & (range - 1); + + put_bits(&s->pb, mvtab[code][1] + 1, (mvtab[code][0] << 1) | sign); + if (bit_size > 0) { + put_bits(&s->pb, bit_size, bits); + } + } +} + +static void init_mv_penalty_and_fcode(MpegEncContext *s) +{ + int f_code; + int mv; + + for(f_code=1; f_code<=MAX_FCODE; f_code++){ + for(mv=-MAX_MV; mv<=MAX_MV; mv++){ + int len; + + if(mv==0) len= mvtab[0][1]; + else{ + int val, bit_size, code; + + bit_size = f_code - 1; + + val=mv; + if (val < 0) + val = -val; + val--; + code = (val >> bit_size) + 1; + if(code<33){ + len= mvtab[code][1] + 1 + bit_size; + }else{ + len= mvtab[32][1] + av_log2(code>>5) + 2 + bit_size; + } + } + + mv_penalty[f_code][mv+MAX_MV]= len; + } + } + + for(f_code=MAX_FCODE; f_code>0; f_code--){ + for(mv=-(16<<f_code); mv<(16<<f_code); mv++){ + fcode_tab[mv+MAX_MV]= f_code; + } + } + + for(mv=0; mv<MAX_MV*2+1; mv++){ + umv_fcode_tab[mv]= 1; + } +} + +static void init_uni_h263_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){ + int slevel, run, last; + + assert(MAX_LEVEL >= 64); + assert(MAX_RUN >= 63); + + for(slevel=-64; slevel<64; slevel++){ + if(slevel==0) continue; + for(run=0; run<64; run++){ + for(last=0; last<=1; last++){ + const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64); + int level= slevel < 0 ? -slevel : slevel; + int sign= slevel < 0 ? 1 : 0; + int bits, len, code; + + len_tab[index]= 100; + + /* ESC0 */ + code= get_rl_index(rl, last, run, level); + bits= rl->table_vlc[code][0]; + len= rl->table_vlc[code][1]; + bits=bits*2+sign; len++; + + if(code!=rl->n && len < len_tab[index]){ + if(bits_tab) bits_tab[index]= bits; + len_tab [index]= len; + } + /* ESC */ + bits= rl->table_vlc[rl->n][0]; + len = rl->table_vlc[rl->n][1]; + bits=bits*2+last; len++; + bits=bits*64+run; len+=6; + bits=bits*256+(level&0xff); len+=8; + + if(len < len_tab[index]){ + if(bits_tab) bits_tab[index]= bits; + len_tab [index]= len; + } + } + } + } +} + +void h263_encode_init(MpegEncContext *s) +{ + static int done = 0; + + if (!done) { + done = 1; + + init_rl(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]); + init_rl(&rl_intra_aic, ff_h263_static_rl_table_store[1]); + + init_uni_h263_rl_tab(&rl_intra_aic, NULL, uni_h263_intra_aic_rl_len); + init_uni_h263_rl_tab(&ff_h263_rl_inter , NULL, uni_h263_inter_rl_len); + + init_mv_penalty_and_fcode(s); + } + s->me.mv_penalty= mv_penalty; //FIXME exact table for msmpeg4 & h263p + + s->intra_ac_vlc_length =s->inter_ac_vlc_length = uni_h263_inter_rl_len; + s->intra_ac_vlc_last_length=s->inter_ac_vlc_last_length= uni_h263_inter_rl_len + 128*64; + if(s->h263_aic){ + s->intra_ac_vlc_length = uni_h263_intra_aic_rl_len; + s->intra_ac_vlc_last_length= uni_h263_intra_aic_rl_len + 128*64; + } + s->ac_esc_length= 7+1+6+8; + + // use fcodes >1 only for mpeg4 & h263 & h263p FIXME + switch(s->codec_id){ + case CODEC_ID_MPEG4: + s->fcode_tab= fcode_tab; + break; + case CODEC_ID_H263P: + if(s->umvplus) + s->fcode_tab= umv_fcode_tab; + if(s->modified_quant){ + s->min_qcoeff= -2047; + s->max_qcoeff= 2047; + }else{ + s->min_qcoeff= -127; + s->max_qcoeff= 127; + } + break; + //Note for mpeg4 & h263 the dc-scale table will be set per frame as needed later + case CODEC_ID_FLV1: + if (s->h263_flv > 1) { + s->min_qcoeff= -1023; + s->max_qcoeff= 1023; + } else { + s->min_qcoeff= -127; + s->max_qcoeff= 127; + } + s->y_dc_scale_table= + s->c_dc_scale_table= ff_mpeg1_dc_scale_table; + break; + default: //nothing needed - default table already set in mpegvideo.c + s->min_qcoeff= -127; + s->max_qcoeff= 127; + s->y_dc_scale_table= + s->c_dc_scale_table= ff_mpeg1_dc_scale_table; + } +} + +void ff_h263_encode_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= s->mb_x + s->mb_width*s->mb_y; + put_bits(&s->pb, ff_mba_length[i], mb_pos); +} |