int lame_encode_mp3_frame ( // Output lame_global_flags* const gfp, // Context sample_t* inbuf_l, // Input sample_t* inbuf_r, // Input unsigned char* mp3buf, // Output int mp3buf_size ) // Output { #ifdef macintosh /* PLL 14/04/2000 */ static FLOAT8 xr[2][2][576]; static int l3_enc[2][2][576]; #else FLOAT8 xr[2][2][576]; int l3_enc[2][2][576]; #endif int mp3count; III_psy_ratio masking_LR[2][2]; /*LR masking & energy */ III_psy_ratio masking_MS[2][2]; /*MS masking & energy */ III_psy_ratio (*masking)[2][2]; /*pointer to selected maskings*/ III_scalefac_t scalefac[2][2]; const sample_t *inbuf[2]; lame_internal_flags *gfc=gfp->internal_flags; FLOAT8 tot_ener[2][4]; FLOAT8 ms_ener_ratio[2]={.5,.5}; chgrdata pe,pe_MS; chgrdata *pe_use; int ch,gr,mean_bits; int bitsPerFrame; int check_ms_stereo; FLOAT8 ms_ratio_next = 0.; FLOAT8 ms_ratio_prev = 0.; memset((char *) masking_LR, 0, sizeof(masking_LR)); memset((char *) masking_MS, 0, sizeof(masking_MS)); memset((char *) scalefac, 0, sizeof(scalefac)); inbuf[0]=inbuf_l; inbuf[1]=inbuf_r; check_ms_stereo = (gfp->mode == JOINT_STEREO); gfc->mode_ext = MPG_MD_LR_LR; if (gfc->lame_encode_frame_init==0 ) { gfc->lame_encode_frame_init=1; /* padding method as described in * "MPEG-Layer3 / Bitstream Syntax and Decoding" * by Martin Sieler, Ralph Sperschneider * * note: there is no padding for the very first frame * * [email protected] 2000-06-22 */ gfc->frac_SpF = ((gfp->version+1)*72000L*gfp->brate) % gfp->out_samplerate; gfc->slot_lag = gfc->frac_SpF; /* check FFT will not use a negative starting offset */ #if 576 < FFTOFFSET # error FFTOFFSET greater than 576: FFT uses a negative offset #endif /* check if we have enough data for FFT */ assert(gfc->mf_size>=(BLKSIZE+gfp->framesize-FFTOFFSET)); /* check if we have enough data for polyphase filterbank */ /* it needs 1152 samples + 286 samples ignored for one granule */ /* 1152+576+286 samples for two granules */ assert(gfc->mf_size>=(286+576*(1+gfc->mode_gr))); /* prime the MDCT/polyphase filterbank with a short block */ { int i,j; sample_t primebuff0[286+1152+576]; sample_t primebuff1[286+1152+576]; for (i=0, j=0; i<286+576*(1+gfc->mode_gr); ++i) { if (i<576*gfc->mode_gr) { primebuff0[i]=0; if (gfc->channels_out==2) primebuff1[i]=0; }else{ primebuff0[i]=inbuf[0][j]; if (gfc->channels_out==2) primebuff1[i]=inbuf[1][j]; ++j; } } /* polyphase filtering / mdct */ for ( gr = 0; gr < gfc->mode_gr; gr++ ) { for ( ch = 0; ch < gfc->channels_out; ch++ ) { gfc->l3_side.gr[gr].ch[ch].tt.block_type=SHORT_TYPE; } } mdct_sub48(gfc, primebuff0, primebuff1, xr); } iteration_init(gfp); /* prepare for ATH auto adjustment: * we want to decrease the ATH by 12 dB per second */ { FLOAT8 frame_duration = 576. * gfc->mode_gr / gfp->out_samplerate; gfc->ATH->decay = pow(10., -12./10. * frame_duration); gfc->ATH->adjust = 1.0; gfc->ATH->adjust_limit = 0.01; } } /********************** padding *****************************/ switch (gfp->padding_type) { case 0: gfc->padding=0; break; case 1: gfc->padding=1; break; case 2: default: if (gfp->VBR!=vbr_off) { gfc->padding=0; } else { if (gfp->disable_reservoir) { gfc->padding = 0; /* if the user specified --nores, dont very gfc->padding either */ /* tiny changes in frac_SpF rounding will cause file differences */ }else{ /* padding method as described in * "MPEG-Layer3 / Bitstream Syntax and Decoding" * by Martin Sieler, Ralph Sperschneider * * note: there is no padding for the very first frame * * [email protected] 2000-06-22 */ gfc->slot_lag -= gfc->frac_SpF; if (gfc->slot_lag < 0) { gfc->slot_lag += gfp->out_samplerate; gfc->padding = 1; } else { gfc->padding = 0; } } /* reservoir enabled */ } } if (gfc->psymodel) { /* psychoacoustic model * psy model has a 1 granule (576) delay that we must compensate for * (mt 6/99). */ int ret; const sample_t *bufp[2]; /* address of beginning of left & right granule */ int blocktype[2]; ms_ratio_prev=gfc->ms_ratio[gfc->mode_gr-1]; for (gr=0; gr < gfc->mode_gr ; gr++) { for ( ch = 0; ch < gfc->channels_out; ch++ ) bufp[ch] = &inbuf[ch][576 + gr*576-FFTOFFSET]; if (gfc->nsPsy.use) { ret=L3psycho_anal_ns( gfp, bufp, gr, &gfc->ms_ratio[gr],&ms_ratio_next, masking_LR, masking_MS, pe[gr],pe_MS[gr],tot_ener[gr],blocktype); } else { ret=L3psycho_anal( gfp, bufp, gr, &gfc->ms_ratio[gr],&ms_ratio_next, masking_LR, masking_MS, pe[gr],pe_MS[gr],tot_ener[gr],blocktype); } if (ret!=0) return -4; for ( ch = 0; ch < gfc->channels_out; ch++ ) gfc->l3_side.gr[gr].ch[ch].tt.block_type=blocktype[ch]; if (check_ms_stereo) { ms_ener_ratio[gr] = tot_ener[gr][2]+tot_ener[gr][3]; if (ms_ener_ratio[gr]>0) ms_ener_ratio[gr] = tot_ener[gr][3]/ms_ener_ratio[gr]; } } }else{ for (gr=0; gr < gfc->mode_gr ; gr++) for ( ch = 0; ch < gfc->channels_out; ch++ ) { gfc->l3_side.gr[gr].ch[ch].tt.block_type=NORM_TYPE; pe_MS[gr][ch]=pe[gr][ch]=700; } } /* auto-adjust of ATH, useful for low volume */ adjust_ATH( gfp, tot_ener ); /* block type flags */ for( gr = 0; gr < gfc->mode_gr; gr++ ) { for ( ch = 0; ch < gfc->channels_out; ch++ ) { gr_info *cod_info = &gfc->l3_side.gr[gr].ch[ch].tt; cod_info->mixed_block_flag = 0; /* never used by this model */ if (cod_info->block_type == NORM_TYPE ) cod_info->window_switching_flag = 0; else cod_info->window_switching_flag = 1; } } /* polyphase filtering / mdct */ mdct_sub48(gfc, inbuf[0], inbuf[1], xr); /* re-order the short blocks, for more efficient encoding below */ for (gr = 0; gr < gfc->mode_gr; gr++) { for (ch = 0; ch < gfc->channels_out; ch++) { gr_info *cod_info = &gfc->l3_side.gr[gr].ch[ch].tt; if (cod_info->block_type==SHORT_TYPE) { freorder(gfc->scalefac_band.s,xr[gr][ch]); } } } /* use m/s gfc->channels_out? */ if (check_ms_stereo) { int gr0 = 0, gr1 = gfc->mode_gr-1; /* make sure block type is the same in each channel */ check_ms_stereo = (gfc->l3_side.gr[gr0].ch[0].tt.block_type==gfc->l3_side.gr[gr0].ch[1].tt.block_type) && (gfc->l3_side.gr[gr1].ch[0].tt.block_type==gfc->l3_side.gr[gr1].ch[1].tt.block_type); } /* Here will be selected MS or LR coding of the 2 stereo channels */ assert ( gfc->mode_ext == MPG_MD_LR_LR ); gfc->mode_ext = MPG_MD_LR_LR; if (gfp->force_ms) { gfc->mode_ext = MPG_MD_MS_LR; } else if (check_ms_stereo) { /* ms_ratio = is scaled, for historical reasons, to look like a ratio of side_channel / total. 0 = signal is 100% mono .5 = L & R uncorrelated */ /* [0] and [1] are the results for the two granules in MPEG-1, * in MPEG-2 it's only a faked averaging of the same value * _prev is the value of the last granule of the previous frame * _next is the value of the first granule of the next frame */ FLOAT8 ms_ratio_ave1; FLOAT8 ms_ratio_ave2; FLOAT8 threshold1 = 0.35; FLOAT8 threshold2 = 0.45; /* take an average */ if (gfc->mode_gr==1) { /* MPEG2 - no second granule */ ms_ratio_ave1 = 0.33 * ( gfc->ms_ratio[0] + ms_ratio_prev + ms_ratio_next ); ms_ratio_ave2 = gfc->ms_ratio[0]; }else{ ms_ratio_ave1 = 0.25 * ( gfc->ms_ratio[0] + gfc->ms_ratio[1] + ms_ratio_prev + ms_ratio_next ); ms_ratio_ave2 = 0.50 * ( gfc->ms_ratio[0] + gfc->ms_ratio[1] ); } if (gfp->mode_automs) { if ( gfp->compression_ratio < 11.025 ) { /* 11.025 => 1, 6.3 => 0 */ double thr = (gfp->compression_ratio - 6.3) / (11.025 - 6.3); if (thr<0) thr=0; threshold1 *= thr; threshold2 *= thr; } } if ((ms_ratio_ave1 < threshold1 && ms_ratio_ave2 < threshold2) || gfc->nsPsy.use) { int sum_pe_MS = pe_MS[0][0] + pe_MS[0][1] + pe_MS[1][0] + pe_MS[1][1]; int sum_pe_LR = pe [0][0] + pe [0][1] + pe [1][0] + pe [1][1]; /* based on PE: M/S coding would not use much more bits than L/R coding */ if (sum_pe_MS <= 1.07 * sum_pe_LR && !gfc->nsPsy.use) gfc->mode_ext = MPG_MD_MS_LR; if (sum_pe_MS <= 1.00 * sum_pe_LR && gfc->nsPsy.use) gfc->mode_ext = MPG_MD_MS_LR; } } /* copy data for MP3 frame analyzer */ if (gfp->analysis && gfc->pinfo != NULL) { for ( gr = 0; gr < gfc->mode_gr; gr++ ) { for ( ch = 0; ch < gfc->channels_out; ch++ ) { gfc->pinfo->ms_ratio[gr]=gfc->ms_ratio[gr]; gfc->pinfo->ms_ener_ratio[gr]=ms_ener_ratio[gr]; gfc->pinfo->blocktype[gr][ch]= gfc->l3_side.gr[gr].ch[ch].tt.block_type; memcpy(gfc->pinfo->xr[gr][ch],xr[gr][ch],sizeof(xr[gr][ch])); /* in psymodel, LR and MS data was stored in pinfo. switch to MS data: */ if (gfc->mode_ext==MPG_MD_MS_LR) { gfc->pinfo->pe[gr][ch]=gfc->pinfo->pe[gr][ch+2]; gfc->pinfo->ers[gr][ch]=gfc->pinfo->ers[gr][ch+2]; memcpy(gfc->pinfo->energy[gr][ch],gfc->pinfo->energy[gr][ch+2], sizeof(gfc->pinfo->energy[gr][ch])); } } } } /* bit and noise allocation */ if (MPG_MD_MS_LR == gfc->mode_ext) { masking = &masking_MS; /* use MS masking */ pe_use = &pe_MS; } else { masking = &masking_LR; /* use LR masking */ pe_use = &pe; } if (gfc->nsPsy.use && (gfp->VBR == vbr_off || gfp->VBR == vbr_abr)) { static FLOAT fircoef[19] = { -0.0207887,-0.0378413,-0.0432472,-0.031183, 7.79609e-18,0.0467745,0.10091,0.151365, 0.187098,0.2,0.187098,0.151365, 0.10091,0.0467745,7.79609e-18,-0.031183, -0.0432472,-0.0378413,-0.0207887, }; int i; FLOAT8 f; for(i=0;i<18;i++) gfc->nsPsy.pefirbuf[i] = gfc->nsPsy.pefirbuf[i+1]; i=0; gfc->nsPsy.pefirbuf[18] = 0; for ( gr = 0; gr < gfc->mode_gr; gr++ ) { for ( ch = 0; ch < gfc->channels_out; ch++ ) { gfc->nsPsy.pefirbuf[18] += (*pe_use)[gr][ch]; i++; } } gfc->nsPsy.pefirbuf[18] = gfc->nsPsy.pefirbuf[18] / i; f = 0; for(i=0;i<19;i++) f += gfc->nsPsy.pefirbuf[i] * fircoef[i]; for ( gr = 0; gr < gfc->mode_gr; gr++ ) { for ( ch = 0; ch < gfc->channels_out; ch++ ) { (*pe_use)[gr][ch] *= 670 / f; } } } switch (gfp->VBR){ default: case vbr_off: iteration_loop( gfp,*pe_use,ms_ener_ratio, xr, *masking, l3_enc, scalefac); break; case vbr_mt: VBR_quantize( gfp,*pe_use,ms_ener_ratio, xr, *masking, l3_enc, scalefac); break; case vbr_rh: case vbr_mtrh: VBR_iteration_loop( gfp,*pe_use,ms_ener_ratio, xr, *masking, l3_enc, scalefac); break; case vbr_abr: ABR_iteration_loop( gfp,*pe_use,ms_ener_ratio, xr, *masking, l3_enc, scalefac); break; } /* write the frame to the bitstream */ getframebits(gfp, &bitsPerFrame, &mean_bits); format_bitstream( gfp, bitsPerFrame, l3_enc, scalefac); /* copy mp3 bit buffer into array */ mp3count = copy_buffer(mp3buf,mp3buf_size,&gfc->bs); if (gfp->bWriteVbrTag) AddVbrFrame(gfp); /* copy data for MP3 frame analyzer */ if (gfp->analysis && gfc->pinfo != NULL) { int j; for ( ch = 0; ch < gfc->channels_out; ch++ ) { for ( j = 0; j < FFTOFFSET; j++ ) gfc->pinfo->pcmdata[ch][j] = gfc->pinfo->pcmdata[ch][j+gfp->framesize]; for ( j = FFTOFFSET; j < 1600; j++ ) { gfc->pinfo->pcmdata[ch][j] = inbuf[ch][j-FFTOFFSET]; } } set_frame_pinfo (gfp, xr, *masking, l3_enc, scalefac); } updateStats( gfc ); return mp3count; }
int update_compress() { int count = 0; static short buffer[2][samp_per_frame]; int channel; int i; int gr; short *buffer_window[2]; double win_que[2][HAN_SIZE]; double sb_sample[2][3][18][SBLIMIT]; double mdct_freq[2][2][samp_per_frame2]; int enc[2][2][samp_per_frame2]; scalefac_t scalefactor; int mean_bits; unsigned long sent_bits = 0; unsigned long frame_bits = 0; while(wave_get(buffer)) { buffer_window[0] = buffer[0]; buffer_window[1] = buffer[1]; if(l3.frac_slots_per_frame) { if(l3.slot_lag>(l3.frac_slots_per_frame-1.0)) { /* No padding for this frame */ l3.slot_lag -= l3.frac_slots_per_frame; config.mpeg.padding = 0; } else { /* Padding for this frame */ l3.slot_lag += (1-l3.frac_slots_per_frame); config.mpeg.padding = 1; } } config.mpeg.bits_per_frame = 8*(l3.whole_slots_per_frame + config.mpeg.padding); mean_bits = (config.mpeg.bits_per_frame - l3.sideinfo_len)>>1; /* polyphase filtering */ for(gr=0;gr<2;gr++) for(channel=config.wave.channels; channel--; ) for(i=0;i<18;i++) { window_subband(&buffer_window[channel], &win_que[channel][0], channel); filter_subband(&win_que[channel][0], &sb_sample[channel][gr+1][i][0]); } /* apply mdct to the polyphase output */ mdct_sub(sb_sample, mdct_freq, &l3.side_info); /* bit and noise allocation */ iteration_loop(mdct_freq,&l3.side_info, enc, mean_bits,&scalefactor); /* write the frame to the bitstream */ format_bitstream(enc,&l3.side_info,&scalefactor, &l3_bs,mdct_freq); frame_bits = sstell(&l3_bs) - sent_bits; sent_bits += frame_bits; count ++; l3.frames_processed++; if (count==30) { return ((double)l3.frames_processed/config.mpeg.total_frames)*100; } } flush_bitstream(); return 100; //update_status(frames_processed); }
/************************************************************************ * * encodeframe() Layer 3 * * encode a single frame * ************************************************************************ lame_encode_frame() gr 0 gr 1 inbuf: |--------------|---------------|-------------| MDCT output: |--------------|---------------|-------------| FFT's <---------1024----------> <---------1024--------> inbuf = buffer of PCM data size=MP3 framesize encoder acts on inbuf[ch][0], but output is delayed by MDCTDELAY so the MDCT coefficints are from inbuf[ch][-MDCTDELAY] psy-model FFT has a 1 granule day, so we feed it data for the next granule. FFT is centered over granule: 224+576+224 So FFT starts at: 576-224-MDCTDELAY MPEG2: FFT ends at: BLKSIZE+576-224-MDCTDELAY MPEG1: FFT ends at: BLKSIZE+2*576-224-MDCTDELAY (1904) FFT starts at 576-224-MDCTDELAY (304) = 576-FFTOFFSET */ int lame_encode_frame(lame_global_flags *gfp, short int inbuf_l[],short int inbuf_r[], int mf_size,char *mp3buf, int mp3buf_size) { static unsigned long frameBits; static unsigned long bitsPerSlot; static FLOAT8 frac_SpF; static FLOAT8 slot_lag; static unsigned long sentBits = 0; FLOAT8 xr[2][2][576]; int l3_enc[2][2][576]; int mp3count; III_psy_ratio masking_ratio[2][2]; /*LR ratios */ III_psy_ratio masking_MS_ratio[2][2]; /*MS ratios */ III_psy_ratio (*masking)[2][2]; /*LR ratios and MS ratios*/ III_scalefac_t scalefac[2][2]; short int *inbuf[2]; typedef FLOAT8 pedata[2][2]; pedata pe,pe_MS; pedata *pe_use; int ch,gr,mean_bits; int bitsPerFrame; int check_ms_stereo; static FLOAT8 ms_ratio[2]={0,0}; FLOAT8 ms_ratio_next=0; FLOAT8 ms_ratio_prev=0; static FLOAT8 ms_ener_ratio[2]={0,0}; memset((char *) masking_ratio, 0, sizeof(masking_ratio)); memset((char *) masking_MS_ratio, 0, sizeof(masking_MS_ratio)); memset((char *) scalefac, 0, sizeof(scalefac)); inbuf[0]=inbuf_l; inbuf[1]=inbuf_r; gfp->mode_ext = MPG_MD_LR_LR; if (gfp->frameNum==0 ) { /* Figure average number of 'slots' per frame. */ FLOAT8 avg_slots_per_frame; FLOAT8 sampfreq = gfp->out_samplerate/1000.0; int bit_rate = gfp->brate; sentBits = 0; bitsPerSlot = 8; avg_slots_per_frame = (bit_rate*gfp->framesize) / (sampfreq* bitsPerSlot); /* -f fast-math option causes some strange rounding here, be carefull: */ frac_SpF = avg_slots_per_frame - floor(avg_slots_per_frame + 1e-9); if (fabs(frac_SpF) < 1e-9) frac_SpF = 0; slot_lag = -frac_SpF; gfp->padding = 1; if (frac_SpF==0) gfp->padding = 0; /* check FFT will not use a negative starting offset */ assert(576>=FFTOFFSET); /* check if we have enough data for FFT */ assert(mf_size>=(BLKSIZE+gfp->framesize-FFTOFFSET)); } /********************** padding *****************************/ switch (gfp->padding_type) { case 0: gfp->padding=0; break; case 1: gfp->padding=1; break; case 2: default: if (gfp->VBR) { gfp->padding=0; } else { if (gfp->disable_reservoir) { gfp->padding = 0; /* if the user specified --nores, dont very gfp->padding either */ /* tiny changes in frac_SpF rounding will cause file differences */ }else{ if (frac_SpF != 0) { if (slot_lag > (frac_SpF-1.0) ) { slot_lag -= frac_SpF; gfp->padding = 0; } else { gfp->padding = 1; slot_lag += (1-frac_SpF); } } } } } /********************** status display *****************************/ if (!gfp->gtkflag && !gfp->silent) { int mod = gfp->version == 0 ? 200 : 50; if (gfp->frameNum%mod==0) { timestatus(gfp->out_samplerate,gfp->frameNum,gfp->totalframes,gfp->framesize); #ifdef BRHIST if (disp_brhist) { brhist_add_count(); brhist_disp(); } #endif } } if (gfp->psymodel) { /* psychoacoustic model * psy model has a 1 granule (576) delay that we must compensate for * (mt 6/99). */ short int *bufp[2]; /* address of beginning of left & right granule */ int blocktype[2]; ms_ratio_prev=ms_ratio[gfp->mode_gr-1]; for (gr=0; gr < gfp->mode_gr ; gr++) { for ( ch = 0; ch < gfp->stereo; ch++ ) bufp[ch] = &inbuf[ch][576 + gr*576-FFTOFFSET]; L3psycho_anal( gfp,bufp, gr, &ms_ratio[gr],&ms_ratio_next,&ms_ener_ratio[gr], masking_ratio, masking_MS_ratio, pe[gr],pe_MS[gr],blocktype); for ( ch = 0; ch < gfp->stereo; ch++ ) l3_side.gr[gr].ch[ch].tt.block_type=blocktype[ch]; } }else{ for (gr=0; gr < gfp->mode_gr ; gr++) for ( ch = 0; ch < gfp->stereo; ch++ ) { l3_side.gr[gr].ch[ch].tt.block_type=NORM_TYPE; pe[gr][ch]=700; } } /* block type flags */ for( gr = 0; gr < gfp->mode_gr; gr++ ) { for ( ch = 0; ch < gfp->stereo; ch++ ) { gr_info *cod_info = &l3_side.gr[gr].ch[ch].tt; cod_info->mixed_block_flag = 0; /* never used by this model */ if (cod_info->block_type == NORM_TYPE ) cod_info->window_switching_flag = 0; else cod_info->window_switching_flag = 1; } } /* polyphase filtering / mdct */ mdct_sub48(gfp,inbuf[0], inbuf[1], xr, &l3_side); /* use m/s gfp->stereo? */ check_ms_stereo = (gfp->mode == MPG_MD_JOINT_STEREO); if (check_ms_stereo) { /* make sure block type is the same in each channel */ check_ms_stereo = (l3_side.gr[0].ch[0].tt.block_type==l3_side.gr[0].ch[1].tt.block_type) && (l3_side.gr[1].ch[0].tt.block_type==l3_side.gr[1].ch[1].tt.block_type); } if (check_ms_stereo) { /* ms_ratio = is like the ratio of side_energy/total_energy */ FLOAT8 ms_ratio_ave,ms_ener_ratio_ave; /* ms_ratio_ave = .5*(ms_ratio[0] + ms_ratio[1]);*/ ms_ratio_ave = .25*(ms_ratio[0] + ms_ratio[1]+ ms_ratio_prev + ms_ratio_next); ms_ener_ratio_ave = .5*(ms_ener_ratio[0]+ms_ener_ratio[1]); if ( ms_ratio_ave <.35 /*&& ms_ener_ratio_ave<.75*/ ) gfp->mode_ext = MPG_MD_MS_LR; } if (gfp->force_ms) gfp->mode_ext = MPG_MD_MS_LR; #ifdef HAVEGTK if (gfp->gtkflag) { int j; for ( gr = 0; gr < gfp->mode_gr; gr++ ) { for ( ch = 0; ch < gfp->stereo; ch++ ) { pinfo->ms_ratio[gr]=ms_ratio[gr]; pinfo->ms_ener_ratio[gr]=ms_ener_ratio[gr]; pinfo->blocktype[gr][ch]= l3_side.gr[gr].ch[ch].tt.block_type; for ( j = 0; j < 576; j++ ) pinfo->xr[gr][ch][j]=xr[gr][ch][j]; /* if MS stereo, switch to MS psy data */ if (gfp->mode_ext==MPG_MD_MS_LR) { pinfo->pe[gr][ch]=pinfo->pe[gr][ch+2]; pinfo->ers[gr][ch]=pinfo->ers[gr][ch+2]; memcpy(pinfo->energy[gr][ch],pinfo->energy[gr][ch+2], sizeof(pinfo->energy[gr][ch])); } } } } #endif /* bit and noise allocation */ if (MPG_MD_MS_LR == gfp->mode_ext) { masking = &masking_MS_ratio; /* use MS masking */ pe_use=&pe_MS; } else { masking = &masking_ratio; /* use LR masking */ pe_use=&pe; } /* VBR_iteration_loop_new( gfp,*pe_use, ms_ratio, xr, masking, &l3_side, l3_enc, &scalefac); */ if (gfp->VBR) { VBR_iteration_loop( gfp,*pe_use, ms_ratio, xr, *masking, &l3_side, l3_enc, scalefac); }else{ iteration_loop( gfp,*pe_use, ms_ratio, xr, *masking, &l3_side, l3_enc, scalefac); } #ifdef BRHIST brhist_temp[gfp->bitrate_index]++; #endif /* write the frame to the bitstream */ getframebits(gfp,&bitsPerFrame,&mean_bits); III_format_bitstream( gfp,bitsPerFrame, l3_enc, &l3_side, scalefac, &bs); frameBits = bs.totbit - sentBits; if ( frameBits % bitsPerSlot ) /* a program failure */ fprintf( stderr, "Sent %ld bits = %ld slots plus %ld\n", frameBits, frameBits/bitsPerSlot, frameBits%bitsPerSlot ); sentBits += frameBits; /* copy mp3 bit buffer into array */ mp3count = copy_buffer(mp3buf,mp3buf_size,&bs); if (gfp->bWriteVbrTag) AddVbrFrame((int)(sentBits/8)); #ifdef HAVEGTK if (gfp->gtkflag) { int j; for ( ch = 0; ch < gfp->stereo; ch++ ) { for ( j = 0; j < FFTOFFSET; j++ ) pinfo->pcmdata[ch][j] = pinfo->pcmdata[ch][j+gfp->framesize]; for ( j = FFTOFFSET; j < 1600; j++ ) { pinfo->pcmdata[ch][j] = inbuf[ch][j-FFTOFFSET]; } } } #endif gfp->frameNum++; return mp3count; }