--- trunk/xvidcore/src/bitstream/mbcoding.c 2002/03/15 09:20:03 28 +++ trunk/xvidcore/src/bitstream/mbcoding.c 2002/12/19 22:58:58 731 @@ -1,162 +1,195 @@ +/***************************************************************************** + * + * XVID MPEG-4 VIDEO CODEC + * - Macro Block coding functions - + * + * Copyright(C) 2002 Michael Militzer + * + * This file is part of XviD, a free MPEG-4 video encoder/decoder + * + * XviD is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Under section 8 of the GNU General Public License, the copyright + * holders of XVID explicitly forbid distribution in the following + * countries: + * + * - Japan + * - United States of America + * + * Linking XviD statically or dynamically with other modules is making a + * combined work based on XviD. Thus, the terms and conditions of the + * GNU General Public License cover the whole combination. + * + * As a special exception, the copyright holders of XviD give you + * permission to link XviD with independent modules that communicate with + * XviD solely through the VFW1.1 and DShow interfaces, regardless of the + * license terms of these independent modules, and to copy and distribute + * the resulting combined work under terms of your choice, provided that + * every copy of the combined work is accompanied by a complete copy of + * the source code of XviD (the version of XviD used to produce the + * combined work), being distributed under the terms of the GNU General + * Public License plus this exception. An independent module is a module + * which is not derived from or based on XviD. + * + * Note that people who make modified versions of XviD are not obligated + * to grant this special exception for their modified versions; it is + * their choice whether to do so. The GNU General Public License gives + * permission to release a modified version without this exception; this + * exception also makes it possible to release a modified version which + * carries forward this exception. + * + * $Id: mbcoding.c,v 1.35 2002-12-19 22:58:58 edgomez Exp $ + * + ****************************************************************************/ + +#include #include "../portab.h" #include "bitstream.h" #include "zigzag.h" #include "vlc_codes.h" +#include "mbcoding.h" #include "../utils/mbfunctions.h" -#include /* malloc, free */ - -#define ESCAPE 7167 #define ABS(X) (((X)>0)?(X):-(X)) #define CLIP(X,A) (X > A) ? (A) : (X) -static VLC *DCT3D[2]; - -VLC *intra_table, *inter_table; -static short clip_table[4096]; +/***************************************************************************** + * Local data + ****************************************************************************/ + +/* msvc sp5+pp gets confused if they globals are made static */ +static VLC intra_table[524288]; +static VLC inter_table[524288]; + +static VLC DCT3Dintra[4096]; +static VLC DCT3Dinter[4096]; + +/***************************************************************************** + * Vector Length Coding Initialization + ****************************************************************************/ -void create_vlc_tables(void) +void +init_vlc_tables(void) { + int32_t k, l, i, intra, last; VLC *vlc[2]; - VLC **coeff_ptr; + VLC const **coeff_ptr; VLC *vlc1, *vlc2; - VLC *DCT3Dintra; - VLC *DCT3Dinter; - - DCT3Dintra = (VLC *) malloc(sizeof(VLC) * 4096); - DCT3Dinter = (VLC *) malloc(sizeof(VLC) * 4096); - vlc1 = DCT3Dintra; vlc2 = DCT3Dinter; - - vlc[0] = intra_table = (VLC *) malloc(128 * 511 * sizeof(VLC)); - vlc[1] = inter_table = (VLC *) malloc(128 * 511 * sizeof(VLC)); - - // initialize the clipping table - for(i = -2048; i < 2048; i++) { - clip_table[i + 2048] = i; - if(i < -255) - clip_table[i + 2048] = -255; - if(i > 255) - clip_table[i + 2048] = 255; - } - - // generate intra/inter vlc lookup table - for(i = 0; i < 4; i++) { + + vlc[0] = intra_table; + vlc[1] = inter_table; + + /* + * Generate encoding vlc lookup tables + * the lookup table idea is taken from the excellent fame project + * by Vivien Chapellier + */ + for (i = 0; i < 4; i++) { intra = i % 2; - last = i >> 1; + last = i / 2; - coeff_ptr = coeff_vlc[last + (intra << 1)]; - - for(k = -255; k < 256; k++) { // level - char *max_level_ptr = max_level[last + (intra << 1)]; - char *max_run_ptr = max_run[last + (intra << 1)]; - - for(l = 0; l < 64; l++) { // run - int32_t level = k, run = l; - - if(abs(level) <= max_level_ptr[run] && run <= max_run_ptr[abs(level)]) { + coeff_ptr = coeff_vlc[last + 2 * intra]; - if(level > 0) { - vlc[intra]->code = (coeff_ptr[run][level - 1].code) << 1; - vlc[intra]->len = coeff_ptr[run][level - 1].len + 1; - } - else if(level < 0) { - vlc[intra]->code = ((coeff_ptr[run][-level - 1].code) << 1) + 1; - vlc[intra]->len = coeff_ptr[run][-level - 1].len + 1; - } - else { - vlc[intra]->code = 0; - vlc[intra]->len = 0; - } + for (k = -2047; k < 2048; k++) { /* level */ + int8_t const *max_level_ptr = max_level[last + 2 * intra]; + int8_t const *max_run_ptr = max_run[last + 2 * intra]; + + for (l = 0; l < 64; l++) { /* run */ + int32_t level = k; + ptr_t run = l; + + if ((abs(level) <= max_level_ptr[run]) && (run <= (uint32_t) max_run_ptr[abs(level)])) { /* level < max_level and run < max_run */ + + vlc[intra]->code = 0; + vlc[intra]->len = 0; + goto loop_end; } else { - if(level > 0) + if (level > 0) /* correct level */ level -= max_level_ptr[run]; else level += max_level_ptr[run]; - - if(abs(level) <= max_level_ptr[run] && - run <= max_run_ptr[abs(level)]) { - - if(level > 0) { - vlc[intra]->code = (0x06 << (coeff_ptr[run][level - 1].len + 1)) | - (coeff_ptr[run][level - 1].code << 1); - vlc[intra]->len = (coeff_ptr[run][level - 1].len + 1) + 8; - } - else if(level < 0) { - vlc[intra]->code = (0x06 << (coeff_ptr[run][-level - 1].len + 1)) | - ((coeff_ptr[run][-level - 1].code << 1) + 1); - vlc[intra]->len = (coeff_ptr[run][-level - 1].len + 1) + 8; - } - else { - vlc[intra]->code = 0x06; - vlc[intra]->len = 8; - } - } else { - if(level > 0) - level += max_level_ptr[run]; - else - level -= max_level_ptr[run]; - DEBUG1("1) run:", run); - run -= max_run_ptr[abs(level)] + 1; - DEBUG1("2) run:", run); - - if(abs(level) <= max_level_ptr[run] && - run <= max_run_ptr[abs(level)]) { - - if(level > 0) { - vlc[intra]->code = (0x0e << (coeff_ptr[run][level - 1].len + 1)) | - (coeff_ptr[run][level - 1].code << 1); - vlc[intra]->len = (coeff_ptr[run][level - 1].len + 1) + 9; - } - else if(level < 0) { - vlc[intra]->code = (0x0e << (coeff_ptr[run][-level - 1].len + 1)) | - ((coeff_ptr[run][-level - 1].code << 1) + 1); - vlc[intra]->len = (coeff_ptr[run][-level - 1].len + 1) + 9; - } - else { - vlc[intra]->code = 0x0e; - vlc[intra]->len = 9; - } - } else { - if(level != 0) - run += max_run_ptr[abs(level)] + 1; - else - run++; - - DEBUG1("3) run:", run); - - vlc[intra]->code = (uint32_t) ((0x1e + last) << 20) | - (l << 14) | (1 << 13) | ((k & 0xfff) << 1) | 1; - - vlc[intra]->len = 30; - } + + if ((abs(level) <= max_level_ptr[run]) && + (run <= (uint32_t) max_run_ptr[abs(level)])) { + + vlc[intra]->code = 0x06; + vlc[intra]->len = 8; + goto loop_end; + } + + if (level > 0) /* still here? */ + level += max_level_ptr[run]; /* restore level */ + else + level -= max_level_ptr[run]; + + run -= max_run_ptr[abs(level)] + 1; /* and change run */ + + if ((abs(level) <= max_level_ptr[run]) && + (run <= (uint32_t) max_run_ptr[abs(level)])) { + + vlc[intra]->code = 0x0e; + vlc[intra]->len = 9; + goto loop_end; } + run += max_run_ptr[abs(level)] + 1; + } + + vlc[intra]->code = + (uint32_t) ((l << 14) | (0x1e + last) << 20) | (1 << 13) | + ((k & 0xfff) << 1) | 1; + + vlc[intra]->len = 30; + vlc[intra]++; + continue; + + loop_end: + if (level != 0) { + vlc[intra]->code = + (vlc[intra]-> + code << (coeff_ptr[run][abs(level) - 1].len + + 1)) | (coeff_ptr[run][abs(level) - + 1].code << 1); + vlc[intra]->len = + (coeff_ptr[run][abs(level) - 1].len + 1) + + vlc[intra]->len; + + if (level < 0) + vlc[intra]->code += 1; } + vlc[intra]++; } } } - intra_table += 64*255; // center vlc tables - inter_table += 64*255; // center vlc tables - for(i = 0; i < 4096; i++) { - if(i >= 512) { + for (i = 0; i < 4096; i++) { + if (i >= 512) { *vlc1 = DCT3Dtab3[(i >> 5) - 16]; *vlc2 = DCT3Dtab0[(i >> 5) - 16]; - } - else if(i >= 128) { + } else if (i >= 128) { *vlc1 = DCT3Dtab4[(i >> 2) - 32]; *vlc2 = DCT3Dtab1[(i >> 2) - 32]; - } - else if(i >= 8) { + } else if (i >= 8) { *vlc1 = DCT3Dtab5[i - 8]; *vlc2 = DCT3Dtab2[i - 8]; - } - else { + } else { *vlc1 = ERRtab[i]; *vlc2 = ERRtab[i]; } @@ -169,322 +202,418 @@ } -void destroy_vlc_tables(void) { - - if(intra_table != NULL && inter_table != NULL) { - intra_table -= 64*255; // uncenter vlc tables - inter_table -= 64*255; // uncenter vlc tables - - free(intra_table); - free(inter_table); - } - - if(DCT3D[0] != NULL && DCT3D[1] != NULL) { - free(DCT3D[0]); - free(DCT3D[1]); - } - -} - -static __inline void CodeVector(Bitstream *bs, int16_t value, int16_t f_code, Statistics *pStat) +/***************************************************************************** + * Local inlined functions for MB coding + ****************************************************************************/ + +static __inline void +CodeVector(Bitstream * bs, + int32_t value, + int32_t f_code, + Statistics * pStat) { + const int scale_factor = 1 << (f_code - 1); const int cmp = scale_factor << 5; - if(value < (-1 * cmp)) + if (value < (-1 * cmp)) value += 64 * scale_factor; - - if(value > (cmp - 1)) + + if (value > (cmp - 1)) value -= 64 * scale_factor; - pStat->iMvSum += value * value; - pStat->iMvCount++; + pStat->iMvSum += value * value; + pStat->iMvCount++; - if (value == 0) - BitstreamPutBits(bs, mb_motion_table[32].code, mb_motion_table[32].len); - else { + if (value == 0) { + BitstreamPutBits(bs, mb_motion_table[32].code, + mb_motion_table[32].len); + } else { uint16_t length, code, mv_res, sign; - + length = 16 << f_code; f_code--; - + sign = (value < 0); - if(value >= length) + if (value >= length) value -= 2 * length; - else if(value < -length) + else if (value < -length) value += 2 * length; - if(sign) + if (sign) value = -value; value--; mv_res = value & ((1 << f_code) - 1); code = ((value - mv_res) >> f_code) + 1; - if(sign) + if (sign) code = -code; code += 32; - BitstreamPutBits(bs, mb_motion_table[code].code, mb_motion_table[code].len); - - if(f_code) + BitstreamPutBits(bs, mb_motion_table[code].code, + mb_motion_table[code].len); + + if (f_code) BitstreamPutBits(bs, mv_res, f_code); - } + } + } +static __inline void +CodeCoeff(Bitstream * bs, + const int16_t qcoeff[64], + VLC * table, + const uint16_t * zigzag, + uint16_t intra) +{ -static __inline void CodeCoeff(Bitstream *bs, int16_t qcoeff[64], VLC *table, - const uint16_t *zigzag, uint16_t intra) { uint32_t j, last; short v; VLC *vlc; - + j = intra; - last = 1 + intra; + last = intra; + + while (j < 64 && (v = qcoeff[zigzag[j]]) == 0) + j++; - while((v = qcoeff[zigzag[j++]]) == 0); - do { - // count zeroes - vlc = table + (clip_table[2048+v] << 6) + j - last; - last = j + 1; - while(j < 64 && (v = qcoeff[zigzag[j++]]) == 0); - - // write code - if(j != 64) { + vlc = table + 64 * 2047 + (v << 6) + j - last; + last = ++j; + + /* count zeroes */ + while (j < 64 && (v = qcoeff[zigzag[j]]) == 0) + j++; + + /* write code */ + if (j != 64) { BitstreamPutBits(bs, vlc->code, vlc->len); } else { - vlc += 64*511; + vlc += 64 * 4095; BitstreamPutBits(bs, vlc->code, vlc->len); break; } - } while(1); + } while (1); + } +/***************************************************************************** + * Local functions + ****************************************************************************/ -static void CodeBlockIntra(const MBParam * pParam, const MACROBLOCK *pMB, - int16_t qcoeff[][64], Bitstream * bs, Statistics * pStat) +static void +CodeBlockIntra(const FRAMEINFO * frame, + const MACROBLOCK * pMB, + int16_t qcoeff[6 * 64], + Bitstream * bs, + Statistics * pStat) { + uint32_t i, mcbpc, cbpy, bits; cbpy = pMB->cbp >> 2; - // write mcbpc - if(pParam->coding_type == I_VOP) { - mcbpc = ((pMB->mode >> 1) & 3) | ((pMB->cbp & 3) << 2); - BitstreamPutBits(bs, mcbpc_intra_tab[mcbpc].code, mcbpc_intra_tab[mcbpc].len); - } - else { - mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); - BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); + /* write mcbpc */ + if (frame->coding_type == I_VOP) { + mcbpc = ((pMB->mode >> 1) & 3) | ((pMB->cbp & 3) << 2); + BitstreamPutBits(bs, mcbpc_intra_tab[mcbpc].code, + mcbpc_intra_tab[mcbpc].len); + } else { + mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); + BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, + mcbpc_inter_tab[mcbpc].len); } - // ac prediction flag - if(pMB->acpred_directions[0]) - BitstreamPutBits(bs, 1, 1); + /* ac prediction flag */ + if (pMB->acpred_directions[0]) + BitstreamPutBits(bs, 1, 1); else - BitstreamPutBits(bs, 0, 1); + BitstreamPutBits(bs, 0, 1); - // write cbpy - BitstreamPutBits (bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); + /* write cbpy */ + BitstreamPutBits(bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); - // write dquant - if(pMB->mode == MODE_INTRA_Q) + /* write dquant */ + if (pMB->mode == MODE_INTRA_Q) BitstreamPutBits(bs, pMB->dquant, 2); - // code block coeffs - for(i = 0; i < 6; i++) - { - if(i < 4) - BitstreamPutBits(bs, dcy_tab[qcoeff[i][0] + 255].code, - dcy_tab[qcoeff[i][0] + 255].len); + /* write interlacing */ + if (frame->global_flags & XVID_INTERLACING) { + BitstreamPutBit(bs, pMB->field_dct); + } + /* code block coeffs */ + for (i = 0; i < 6; i++) { + if (i < 4) + BitstreamPutBits(bs, dcy_tab[qcoeff[i * 64 + 0] + 255].code, + dcy_tab[qcoeff[i * 64 + 0] + 255].len); else - BitstreamPutBits(bs, dcc_tab[qcoeff[i][0] + 255].code, - dcc_tab[qcoeff[i][0] + 255].len); - - if(pMB->cbp & (1 << (5 - i))) - { + BitstreamPutBits(bs, dcc_tab[qcoeff[i * 64 + 0] + 255].code, + dcc_tab[qcoeff[i * 64 + 0] + 255].len); + + if (pMB->cbp & (1 << (5 - i))) { bits = BitstreamPos(bs); - CodeCoeff(bs, qcoeff[i], intra_table, scan_tables[pMB->acpred_directions[i]], 1); + CodeCoeff(bs, &qcoeff[i * 64], intra_table, + scan_tables[pMB->acpred_directions[i]], 1); bits = BitstreamPos(bs) - bits; pStat->iTextBits += bits; } } + } -static void CodeBlockInter(const MBParam * pParam, const MACROBLOCK *pMB, - int16_t qcoeff[][64], Bitstream * bs, Statistics * pStat) +static void +CodeBlockInter(const FRAMEINFO * frame, + const MACROBLOCK * pMB, + int16_t qcoeff[6 * 64], + Bitstream * bs, + Statistics * pStat) { + int32_t i; uint32_t bits, mcbpc, cbpy; - mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); + mcbpc = (pMB->mode & 7) | ((pMB->cbp & 3) << 3); cbpy = 15 - (pMB->cbp >> 2); - // write mcbpc - BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, mcbpc_inter_tab[mcbpc].len); + /* write mcbpc */ + BitstreamPutBits(bs, mcbpc_inter_tab[mcbpc].code, + mcbpc_inter_tab[mcbpc].len); - // write cbpy + /* write cbpy */ BitstreamPutBits(bs, cbpy_tab[cbpy].code, cbpy_tab[cbpy].len); - // write dquant - if(pMB->mode == MODE_INTER_Q) + /* write dquant */ + if (pMB->mode == MODE_INTER_Q) BitstreamPutBits(bs, pMB->dquant, 2); - - // code motion vector(s) - for(i = 0; i < (pMB->mode == MODE_INTER4V ? 4 : 1); i++) - { - CodeVector(bs, pMB->pmvs[i].x, pParam->fixed_code, pStat); - CodeVector(bs, pMB->pmvs[i].y, pParam->fixed_code, pStat); + + /* interlacing */ + if (frame->global_flags & XVID_INTERLACING) { + if (pMB->cbp) { + BitstreamPutBit(bs, pMB->field_dct); + DPRINTF(DPRINTF_DEBUG, "codep: field_dct: %d", pMB->field_dct); + } + + /* if inter block, write field ME flag */ + if (pMB->mode == MODE_INTER || pMB->mode == MODE_INTER_Q) { + BitstreamPutBit(bs, pMB->field_pred); + DPRINTF(DPRINTF_DEBUG, "codep: field_pred: %d", pMB->field_pred); + + /* write field prediction references */ + if (pMB->field_pred) { + BitstreamPutBit(bs, pMB->field_for_top); + BitstreamPutBit(bs, pMB->field_for_bot); + } + } + } + /* code motion vector(s) */ + for (i = 0; i < (pMB->mode == MODE_INTER4V ? 4 : 1); i++) { + CodeVector(bs, pMB->pmvs[i].x, frame->fcode, pStat); + CodeVector(bs, pMB->pmvs[i].y, frame->fcode, pStat); } bits = BitstreamPos(bs); - - // code block coeffs - for(i = 0; i < 6; i++) - if(pMB->cbp & (1 << (5 - i))) - CodeCoeff(bs, qcoeff[i], inter_table, scan_tables[0], 0); + + /* code block coeffs */ + for (i = 0; i < 6; i++) + if (pMB->cbp & (1 << (5 - i))) + CodeCoeff(bs, &qcoeff[i * 64], inter_table, scan_tables[0], 0); bits = BitstreamPos(bs) - bits; pStat->iTextBits += bits; + } +/***************************************************************************** + * Macro Block bitstream encoding functions + ****************************************************************************/ -void MBCoding(const MBParam * pParam, MACROBLOCK *pMB, - int16_t qcoeff[][64], - Bitstream * bs, Statistics * pStat) -{ - int intra = (pMB->mode == MODE_INTRA || pMB->mode == MODE_INTRA_Q); - - if(pParam->coding_type == P_VOP) { - if(pMB->cbp == 0 && pMB->mode == MODE_INTER && - pMB->mvs[0].x == 0 && pMB->mvs[0].y == 0) - { - BitstreamPutBit(bs, 1); // not_coded - return; - } - else - BitstreamPutBit(bs, 0); // coded +void +MBCoding(const FRAMEINFO * frame, + MACROBLOCK * pMB, + int16_t qcoeff[6 * 64], + Bitstream * bs, + Statistics * pStat) +{ + + if (frame->coding_type == P_VOP) { + BitstreamPutBit(bs, 0); /* coded */ } - if(intra) - CodeBlockIntra(pParam, pMB, qcoeff, bs, pStat); + if (pMB->mode == MODE_INTRA || pMB->mode == MODE_INTRA_Q) + CodeBlockIntra(frame, pMB, qcoeff, bs, pStat); else - CodeBlockInter(pParam, pMB, qcoeff, bs, pStat); + CodeBlockInter(frame, pMB, qcoeff, bs, pStat); + +} + + +void +MBSkip(Bitstream * bs) +{ + BitstreamPutBit(bs, 1); /* not coded */ + return; +} + +/***************************************************************************** + * decoding stuff starts here + ****************************************************************************/ + +/* + * For IVOP addbits == 0 + * For PVOP addbits == fcode - 1 + * For BVOP addbits == max(fcode,bcode) - 1 + * returns true or false + */ + +int +check_resync_marker(Bitstream * bs, int addbits) +{ + uint32_t nbits; + uint32_t code; + uint32_t nbitsresyncmarker = NUMBITS_VP_RESYNC_MARKER + addbits; + + nbits = BitstreamNumBitsToByteAlign(bs); + code = BitstreamShowBits(bs, nbits); + + if (code == (((uint32_t)1 << (nbits - 1)) - 1)) + { + return BitstreamShowBitsFromByteAlign(bs, nbitsresyncmarker) == RESYNC_MARKER; + } + + return 0; } -/*************************************************************** - * decoding stuff starts here * - ***************************************************************/ -int get_mcbpc_intra(Bitstream * bs) +int +get_mcbpc_intra(Bitstream * bs) { + uint32_t index; - - while((index = BitstreamShowBits(bs, 9)) == 1) - BitstreamSkip(bs, 9); + index = BitstreamShowBits(bs, 9); index >>= 3; BitstreamSkip(bs, mcbpc_intra_table[index].len); + return mcbpc_intra_table[index].code; + } -int get_mcbpc_inter(Bitstream * bs) +int +get_mcbpc_inter(Bitstream * bs) { + uint32_t index; - while((index = CLIP(BitstreamShowBits(bs, 9), 256)) == 1) - BitstreamSkip(bs, 9); + index = CLIP(BitstreamShowBits(bs, 9), 256); + + BitstreamSkip(bs, mcbpc_inter_table[index].len); - BitstreamSkip(bs, mcbpc_inter_table[index].len); return mcbpc_inter_table[index].code; + } -int get_cbpy(Bitstream * bs, int intra) +int +get_cbpy(Bitstream * bs, + int intra) { + int cbpy; uint32_t index = BitstreamShowBits(bs, 6); BitstreamSkip(bs, cbpy_table[index].len); cbpy = cbpy_table[index].code; - if(!intra) + if (!intra) cbpy = 15 - cbpy; return cbpy; + } -int get_mv_data(Bitstream * bs) +int +get_mv_data(Bitstream * bs) { + uint32_t index; - if(BitstreamGetBit(bs)) + if (BitstreamGetBit(bs)) return 0; - + index = BitstreamShowBits(bs, 12); - if(index >= 512) - { + if (index >= 512) { index = (index >> 8) - 2; BitstreamSkip(bs, TMNMVtab0[index].len); return TMNMVtab0[index].code; } - - if(index >= 128) - { + + if (index >= 128) { index = (index >> 2) - 32; BitstreamSkip(bs, TMNMVtab1[index].len); return TMNMVtab1[index].code; } - index -= 4; + index -= 4; BitstreamSkip(bs, TMNMVtab2[index].len); return TMNMVtab2[index].code; + } -int get_mv(Bitstream * bs, int fcode) +int +get_mv(Bitstream * bs, + int fcode) { + int data; int res; int mv; int scale_fac = 1 << (fcode - 1); data = get_mv_data(bs); - - if(scale_fac == 1 || data == 0) + + if (scale_fac == 1 || data == 0) return data; res = BitstreamGetBits(bs, fcode - 1); mv = ((ABS(data) - 1) * scale_fac) + res + 1; - + return data < 0 ? -mv : mv; + } -int get_dc_dif(Bitstream * bs, uint32_t dc_size) +int +get_dc_dif(Bitstream * bs, + uint32_t dc_size) { + int code = BitstreamGetBits(bs, dc_size); int msb = code >> (dc_size - 1); - if(msb == 0) - return (-1 * (code^((1 << dc_size) - 1))); + if (msb == 0) + return (-1 * (code ^ ((1 << dc_size) - 1))); return code; + } -int get_dc_size_lum(Bitstream * bs) +int +get_dc_size_lum(Bitstream * bs) { + int code, i; + code = BitstreamShowBits(bs, 11); - for(i = 11; i > 3; i--) { - if(code == 1) { + for (i = 11; i > 3; i--) { + if (code == 1) { BitstreamSkip(bs, i); return i + 1; } @@ -493,16 +622,20 @@ BitstreamSkip(bs, dc_lum_tab[code].len); return dc_lum_tab[code].code; + } -int get_dc_size_chrom(Bitstream * bs) +int +get_dc_size_chrom(Bitstream * bs) { + uint32_t code, i; + code = BitstreamShowBits(bs, 12); - for(i = 12; i > 2; i--) { - if(code == 1) { + for (i = 12; i > 2; i--) { + if (code == 1) { BitstreamSkip(bs, i); return i; } @@ -510,33 +643,41 @@ } return 3 - BitstreamGetBits(bs, 2); + } -int get_coeff(Bitstream * bs, int *run, int *last, int intra, int short_video_header) +/***************************************************************************** + * Local inlined function to "decode" written vlc codes + ****************************************************************************/ + +static __inline int +get_coeff(Bitstream * bs, + int *run, + int *last, + int intra, + int short_video_header) { - uint32_t mode; - const VLC *tab; + + uint32_t mode; + const VLC *tab; int32_t level; - if(short_video_header) // inter-VLCs will be used for both intra and inter blocks + if (short_video_header) /* inter-VLCs will be used for both intra and inter blocks */ intra = 0; - + tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; - - if(tab->code == -1) + + if (tab->code == -1) goto error; BitstreamSkip(bs, tab->len); - if(tab->code != ESCAPE) { - if(!intra) - { + if (tab->code != ESCAPE) { + if (!intra) { *run = (tab->code >> 4) & 255; level = tab->code & 15; *last = (tab->code >> 12) & 1; - } - else - { + } else { *run = (tab->code >> 8) & 255; level = tab->code & 255; *last = (tab->code >> 16) & 1; @@ -544,22 +685,21 @@ return BitstreamGetBit(bs) ? -level : level; } - if(short_video_header) - { - // escape mode 4 - H.263 type, only used if short_video_header = 1 + if (short_video_header) { + /* escape mode 4 - H.263 type, only used if short_video_header = 1 */ *last = BitstreamGetBit(bs); *run = BitstreamGetBits(bs, 6); level = BitstreamGetBits(bs, 8); - if (level == 0 || level == 128) - DEBUG1("Illegal LEVEL for ESCAPE mode 4:", level); + if (level == 0 || level == 128) + DPRINTF(DPRINTF_ERROR, "Illegal LEVEL for ESCAPE mode 4: %d", level); return (level >= 128 ? -(256 - level) : level); } - + mode = BitstreamShowBits(bs, 2); - if(mode < 3) { + if (mode < 3) { BitstreamSkip(bs, (mode == 2) ? 2 : 1); tab = &DCT3D[intra][BitstreamShowBits(bs, 12)]; @@ -568,90 +708,103 @@ BitstreamSkip(bs, tab->len); - if (!intra) { + if (!intra) { *run = (tab->code >> 4) & 255; level = tab->code & 15; *last = (tab->code >> 12) & 1; - } - else - { + } else { *run = (tab->code >> 8) & 255; level = tab->code & 255; *last = (tab->code >> 16) & 1; - } + } - if(mode < 2) // first escape mode, level is offset - level += max_level[*last + (!intra<<1)][*run]; // need to add back the max level - else if(mode == 2) // second escape mode, run is offset - *run += max_run[*last + (!intra<<1)][level] + 1; - - return BitstreamGetBit(bs) ? -level : level; - } + if (mode < 2) /* first escape mode, level is offset */ + level += max_level[*last + (!intra << 1)][*run]; /* need to add back the max level */ + else if (mode == 2) /* second escape mode, run is offset */ + *run += max_run[*last + (!intra << 1)][level] + 1; - // third escape mode - fixed length codes + return BitstreamGetBit(bs) ? -level : level; + } + /* third escape mode - fixed length codes */ BitstreamSkip(bs, 2); *last = BitstreamGetBits(bs, 1); - *run = BitstreamGetBits(bs, 6); - BitstreamSkip(bs, 1); // marker - level = BitstreamGetBits(bs, 12); - BitstreamSkip(bs, 1); // marker + *run = BitstreamGetBits(bs, 6); + BitstreamSkip(bs, 1); /* marker */ + level = BitstreamGetBits(bs, 12); + BitstreamSkip(bs, 1); /* marker */ return (level & 0x800) ? (level | (-1 ^ 0xfff)) : level; -error: + error: *run = VLC_ERROR; return 0; -} +} -void get_intra_block(Bitstream * bs, int16_t * block, int direction, int coeff) +/***************************************************************************** + * MB reading functions + ****************************************************************************/ + +void +get_intra_block(Bitstream * bs, + int16_t * block, + int direction, + int coeff) { - const uint16_t * scan = scan_tables[ direction ]; + + const uint16_t *scan = scan_tables[direction]; int level; int run; int last; - do - { + do { level = get_coeff(bs, &run, &last, 1, 0); - if (run == -1) - { - DEBUG("fatal: invalid run"); + if (run == -1) { + DPRINTF(DPRINTF_DEBUG, "fatal: invalid run"); break; } coeff += run; - block[ scan[coeff] ] = level; - if (level < -127 || level > 127) - { - DEBUG1("warning: intra_overflow", level); + block[scan[coeff]] = level; + + DPRINTF(DPRINTF_COEFF,"block[%i] %i", scan[coeff], level); + /*DPRINTF(DPRINTF_COEFF,"block[%i] %i %08x", scan[coeff], level, BitstreamShowBits(bs, 32)); */ + + if (level < -127 || level > 127) { + DPRINTF(DPRINTF_DEBUG, "warning: intra_overflow: %d", level); } coeff++; } while (!last); + } -void get_inter_block(Bitstream * bs, int16_t * block) +void +get_inter_block(Bitstream * bs, + int16_t * block) { - const uint16_t * scan = scan_tables[0]; + + const uint16_t *scan = scan_tables[0]; int p; int level; int run; int last; p = 0; - do - { + do { level = get_coeff(bs, &run, &last, 0, 0); - if (run == -1) - { - DEBUG("fatal: invalid run"); + if (run == -1) { + DPRINTF(DPRINTF_ERROR, "fatal: invalid run"); break; } p += run; - block[ scan[p] ] = level; - if (level < -127 || level > 127) - { - DEBUG1("warning: inter_overflow", level); + + block[scan[p]] = level; + + DPRINTF(DPRINTF_COEFF,"block[%i] %i", scan[p], level); + + if (level < -127 || level > 127) { + DPRINTF(DPRINTF_DEBUG, "warning: inter_overflow: %d", level); } p++; } while (!last); + }