| /* ------------------------------------------------------------------ |
| * Copyright (C) 1998-2009 PacketVideo |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| * express or implied. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * ------------------------------------------------------------------- |
| */ |
| /* |
| ------------------------------------------------------------------------------ |
| |
| PacketVideo Corp. |
| MP3 Decoder Library |
| |
| Filename: pvmp3_mpeg2_stereo_proc.cpp |
| |
| Functions: |
| |
| pvmp3_st_intensity_ver2 |
| pvmp3_mpeg2_stereo_proc |
| |
| Date: 09/21/2007 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| |
| Description: |
| |
| |
| ------------------------------------------------------------------------------ |
| |
| pvmp3_st_intensity_ver2 |
| |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Input |
| |
| int32 xr[], input channel |
| int32 xl[], |
| int32 m, selecting index: io = 2(1/4) (m=0), io = 2(1/8) (m=1) |
| int32 is_pos, index on table is_pos_pow_eitgh_root_of_2 |
| int32 Start, Location of first element where stereo intensity is applied |
| int32 Number number of elements affected |
| |
| Returns |
| |
| int32 xl[], generated stereo channel |
| |
| |
| |
| |
| ------------------------------------------------------------------------------ |
| |
| pvmp3_mpeg2_stereo_proc |
| |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Input |
| |
| int32 xr[], input channel |
| int32 xl[], |
| mp3ScaleFactors *scalefac, scale factors structure for Right channel |
| granuleInfo *gr_info_l, granule structure for the left channel |
| granuleInfo *gr_info_r, granule structure for the rigth channel |
| uint32 *scalefac_IIP_buffer, auxiliary scale factor vector |
| mp3Header *info mp3 header info |
| Returns |
| |
| int32 xl[], generated stereo channel |
| |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| stereo processing for mpeg2 layer III LSF extension |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| [1] ISO MPEG Audio Subgroup Software Simulation Group (1996) |
| ISO 13818-3 MPEG-2 Audio Decoder - Lower Sampling Frequency Extension |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| #include "pvmp3_mpeg2_stereo_proc.h" |
| #include "pvmp3_stereo_proc.h" |
| #include "pv_mp3dec_fxd_op.h" |
| #include "pvmp3_tables.h" |
| #include "mp3_mem_funcs.h" |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| |
| #define Q31_fmt(a) (int32(double(0x7FFFFFFF)*a)) |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; LOCAL STORE/BUFFER/POINTER DEFINITIONS |
| ; Variable declaration - defined here and used outside this module |
| ----------------------------------------------------------------------------*/ |
| const int32 is_pos_pow_eitgh_root_of_2[8] = |
| { |
| /* --- 2^(1/8) ----- */ |
| Q31_fmt(1.00000000000000), Q31_fmt(0.91700404320467), Q31_fmt(0.84089641525371), |
| Q31_fmt(0.77110541270397), Q31_fmt(0.70710678118655), Q31_fmt(0.64841977732550), |
| Q31_fmt(0.59460355750136), Q31_fmt(0.54525386633263) |
| }; |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL FUNCTION REFERENCES |
| ; Declare functions defined elsewhere and referenced in this module |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES |
| ; Declare variables used in this module but defined elsewhere |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| |
| void pvmp3_st_intensity_ver2(int32 xr[SUBBANDS_NUMBER*FILTERBANK_BANDS], |
| int32 xl[SUBBANDS_NUMBER*FILTERBANK_BANDS], |
| int32 m, |
| int32 is_pos, |
| int32 Start, |
| int32 Number) |
| { |
| int32 k[2]; |
| |
| /* pow(io, ((is_pos + 1)>>1)); io = 2(1/4) (m=0), io = 2(1/8) (m=1) */ |
| k[0] = is_pos_pow_eitgh_root_of_2[((is_pos+1)&(3+(m<<2)))<<(1-m)] >> ((is_pos + 1) >> (2 + m)); |
| /* pow(io, (is_pos>>1)); io = 2(1/4) (m=0), io = 2(1/8) (m=1) */ |
| k[1] = is_pos_pow_eitgh_root_of_2[(is_pos&(3+(m<<2)))<<(1-m)] >> (is_pos >> (2 + m)); |
| |
| |
| int32 *pt_xr = &xr[Start]; |
| int32 *pt_xl = &xl[Start]; |
| |
| if (is_pos == 0) /* 0 < is_pos < 31 */ |
| { |
| pv_memcpy(pt_xl, pt_xr, Number*sizeof(*pt_xr)); |
| } |
| else if (is_pos & 1) |
| { |
| for (int32 i = Number >> 1; i != 0; i--) |
| { |
| *(pt_xl++) = (*pt_xr); |
| *(pt_xr) = fxp_mul32_Q32((*pt_xr) << 1, k[0]); |
| pt_xr++; |
| *(pt_xl++) = (*pt_xr); |
| *(pt_xr) = fxp_mul32_Q32((*pt_xr) << 1, k[0]); |
| pt_xr++; |
| } |
| if (Number&1) |
| { |
| *(pt_xl) = (*pt_xr); |
| *(pt_xr) = fxp_mul32_Q32((*pt_xr) << 1, k[0]); |
| } |
| } |
| else |
| { |
| for (int32 i = Number >> 1; i != 0; i--) |
| { |
| *(pt_xl++) = fxp_mul32_Q32((*(pt_xr++)) << 1, k[1]); |
| *(pt_xl++) = fxp_mul32_Q32((*(pt_xr++)) << 1, k[1]); |
| } |
| if (Number&1) |
| { |
| *(pt_xl) = fxp_mul32_Q32((*pt_xr) << 1, k[1]); |
| } |
| } |
| |
| } |
| |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; FUNCTION CODE |
| ----------------------------------------------------------------------------*/ |
| void pvmp3_mpeg2_stereo_proc(int32 xr[SUBBANDS_NUMBER*FILTERBANK_BANDS], |
| int32 xl[SUBBANDS_NUMBER*FILTERBANK_BANDS], |
| mp3ScaleFactors *scalefac_R, |
| granuleInfo *gr_info_l, |
| granuleInfo *gr_info_r, |
| uint32 *scalefac_IIP_buffer, |
| int32 used_freq_lines, |
| mp3Header *info) |
| { |
| |
| int32 sfreq; |
| int32 sb; |
| int32 ss; |
| int32 sfbNo; |
| int32 sfbStart; |
| int32 sfb; |
| int32 sfbTemp; |
| int32 i; |
| int32 j; |
| int32 io; |
| |
| |
| int32 i_stereo = (info->mode == MPG_MD_JOINT_STEREO) && |
| (info->mode_ext & 0x1); |
| |
| int32 ms_stereo = (info->mode == MPG_MD_JOINT_STEREO) && |
| (info->mode_ext & 0x2); |
| |
| |
| if (i_stereo) |
| { |
| if (gr_info_r->scalefac_compress & 1) |
| { |
| io = 0; /* 2^(-1/4) */ |
| } |
| else |
| { |
| io = 1; /* 2^(-1/8) */ |
| } |
| |
| sfreq = info->version_x + (info->version_x << 1); |
| sfreq += info->sampling_frequency; |
| |
| if (gr_info_l->window_switching_flag && (gr_info_l->block_type == 2)) |
| { |
| if (gr_info_l->mixed_block_flag) |
| { |
| /* |
| * mixed blocks processing |
| */ |
| i = 31; |
| ss = 17; |
| sb = -1; |
| |
| while (i >= 0) |
| { |
| if (xl[(i*FILTERBANK_BANDS) + ss]) |
| { |
| sb = (i << 4) + (i << 1) + ss; |
| i = -1; |
| } |
| else |
| { |
| ss--; |
| if (ss < 0) |
| { |
| i--; |
| ss = 17; |
| } |
| } |
| } /* now sb is the number of highest line with value != 0 */ |
| /* can be between -1 (all lines zero) and 575 (no line zero) */ |
| |
| if (sb < 36) /* was (sb <= 36) */ |
| { |
| /* |
| * mixed blocks processing: intensity bound inside long blocks |
| */ |
| /* 1. long blocks up to intensity border: Stereo or M/S */ |
| if (mp3_sfBandIndex[sfreq].l[4] <= sb) |
| { |
| i = 4; |
| } |
| else |
| { |
| i = 0; |
| } |
| |
| while (mp3_sfBandIndex[sfreq].l[i] <= sb) |
| { |
| i++; |
| } |
| sfbTemp = i; /* from that (long) sfb on we have intensity stereo */ |
| |
| sfbNo = mp3_sfBandIndex[sfreq].l[sfbTemp]; /* number of lines to process */ |
| |
| /* from sfbStart up sfbNo lines do ms_stereo or normal stereo */ |
| if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, 0, sfbNo); |
| } |
| |
| /* 2. long blocks from intensity border up to sfb band 6: intensity */ |
| /* calc. MPEG_1_2_Factor[0], MPEG_1_2_Factor[1] */ |
| |
| for (sfb = sfbTemp; sfb < 6; sfb++) |
| { |
| sfbStart = mp3_sfBandIndex[sfreq].l[sfb]; /* = Start in 0 ... 575 */ |
| sfbNo = mp3_sfBandIndex[sfreq].l[sfb+1] - mp3_sfBandIndex[sfreq].l[sfb]; /* No of lines to process */ |
| |
| if ((uint32)(scalefac_R->l[sfb]) != scalefac_IIP_buffer[sfb]) |
| { |
| pvmp3_st_intensity_ver2(xr, xl, io, scalefac_R->l[sfb], sfbStart, sfbNo); |
| } |
| else if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, sfbStart, sfbNo); |
| } |
| } |
| |
| /* 3. now process all sfb with short blocks (3...12), all in intensity mode */ |
| |
| for (j = 0; j < 3; j++) |
| { |
| /* first calculate directional factors for intensity stereo, |
| * for all sfb in intensity mode, but only |
| * if they do not have "illegal" position: |
| */ |
| /* to do this for all sfb we have to get information for last scale factor band: |
| * here we clearly have more than one sfb in intensity mode, |
| * so copy factors and legal/illegal information from sfb11 to sfb12 |
| */ |
| (scalefac_R->s[j][12]) = (scalefac_R->s[j][11]); |
| scalefac_IIP_buffer[36 + j] = scalefac_IIP_buffer[33 + j]; /* legal/illegal in sfb 12 same as in sfb 11 */ |
| |
| for (sfb = 3; sfb < 13; sfb++) |
| { |
| sfbNo = mp3_sfBandIndex[sfreq].s[sfb+1] - mp3_sfBandIndex[sfreq].s[sfb]; /* No of lines to process */ |
| sfbStart = 3 * mp3_sfBandIndex[sfreq].s[sfb] + j * sfbNo; |
| |
| if ((uint32)(scalefac_R->s[j][sfb]) != scalefac_IIP_buffer[3*sfb + j]) |
| { |
| pvmp3_st_intensity_ver2(xr, xl, io, scalefac_R->s[j][sfb], sfbStart, sfbNo); |
| } |
| else if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, sfbStart, sfbNo); |
| } |
| } |
| } /* for (j = 0; j < 3; j++) */ |
| } |
| else /* else then (sb >= 36) */ |
| { |
| /* |
| * mixed blocks processing: intensity bound outside long blocks |
| */ |
| |
| /* 2. short blocks, do for all 3 */ |
| /* ------------------------------ */ |
| for (j = 0; j < 3; j++) |
| { |
| int32 sfbcnt = -1; |
| |
| for (sfb = 12; sfb >= 3; sfb--) |
| { |
| int32 lines = mp3_sfBandIndex[sfreq].s[sfb+1] - mp3_sfBandIndex[sfreq].s[sfb]; |
| |
| i = 3 * mp3_sfBandIndex[sfreq].s[sfb] + (j + 1) * lines - 1; |
| |
| while (lines > 0) |
| { |
| if (xl[i]) |
| { |
| sfbcnt = sfb; |
| sfb = -10; |
| lines = -10; |
| } |
| lines--; |
| i--; |
| } |
| } |
| |
| sfbcnt += 1; |
| if (sfbcnt < 3) |
| { |
| sfbcnt = 3; /* should not be necessary */ |
| } |
| |
| sfbTemp = sfbcnt; /* from this (short) sfb on we have intensity mode */ |
| /* can have values between 3 (all short sfb in intensity) */ |
| /* and 13 (no short sfb in intensity mode) */ |
| |
| /* 3. from sfbTemp to last sfb calculate is_ratio values: */ |
| /* first calculate directional factors for intensity stereo, */ |
| /* for all sfb in intensity mode, but only */ |
| /* if they do not have "illegal" position: */ |
| |
| /* to do this for all sfb we have to get information for last scale factor band: */ |
| /* get factors for last scale factor band: */ |
| /* more than one sfb in intensity mode, |
| copy factors and legal/illegal information from sfb11 to sfb12 */ |
| if (sfbTemp < 12) |
| { |
| (scalefac_R->s[j][12]) = (scalefac_R->s[j][11]); |
| scalefac_IIP_buffer[36 + j] = scalefac_IIP_buffer[33 + j]; /* legal/illegal in sfb 12 same as in sfb 11 */ |
| } |
| else if (sfbTemp == sfb) |
| /* only sfb 12 in intensity mode, use factors corresponding to is_pos[12] == 0 */ |
| { |
| (scalefac_R->s[j][12]) = 0; |
| scalefac_IIP_buffer[36 + j] = 1; /* the scf value 0 in sfb12 is "legal" */ |
| } |
| /* if sfbTemp > sfb (no sfb in intensity mode): do nothing */ |
| |
| |
| /* 4. do normal stereo or MS stereo from sfb 3 to < sfbTemp: */ |
| for (sfb = 3; sfb < sfbTemp; sfb++) |
| { |
| sfbNo = mp3_sfBandIndex[sfreq].s[sfb+1] - mp3_sfBandIndex[sfreq].s[sfb]; |
| sfbStart = 3 * mp3_sfBandIndex[sfreq].s[sfb] + j * sfbNo; |
| |
| if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, sfbStart, sfbNo); |
| } |
| } |
| |
| /* 5. now intensity stereo processing of the remaining sfb's: */ |
| |
| for (sfb = sfbTemp; sfb < 13; sfb++) |
| { |
| sfbNo = mp3_sfBandIndex[sfreq].s[sfb+1] - mp3_sfBandIndex[sfreq].s[sfb]; /* No of lines to process */ |
| sfbStart = 3 * mp3_sfBandIndex[sfreq].s[sfb] + j * sfbNo; |
| if ((uint32)(scalefac_R->s[j][sfb]) != scalefac_IIP_buffer[3*sfb + j]) |
| { |
| pvmp3_st_intensity_ver2(xr, xl, io, scalefac_R->s[j][sfb], sfbStart, sfbNo); |
| } |
| else if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, sfbStart, sfbNo); |
| } |
| } |
| /* end of correction by efs 2003-07-04 */ |
| } /* for (j = 0; j < 3; j++) */ |
| |
| |
| /* long blocks 0 up to sfb band 6: no intensity */ |
| |
| sfbNo = mp3_sfBandIndex[sfreq].l[6]; /* number of lines to process */ |
| if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, 0, sfbNo); |
| } |
| |
| } /* if intensity bound inside or outside long blocks */ |
| } /* if (gr_info->mixed_block_flag) */ |
| else |
| { |
| /* |
| * short block processing |
| */ |
| for (j = 0; j < 3; j++) |
| { |
| int32 sfbcnt = -1; |
| |
| for (sfb = 12; sfb >= 0; sfb--) |
| { |
| int32 lines = mp3_sfBandIndex[sfreq].s[sfb+1] - mp3_sfBandIndex[sfreq].s[sfb]; |
| i = 3 * mp3_sfBandIndex[sfreq].s[sfb] + (j + 1) * lines - 1; |
| |
| while (lines > 0) |
| { |
| if (xl[i]) |
| { |
| sfbcnt = sfb; |
| sfb = -10; |
| lines = -10; |
| } |
| lines--; |
| i--; |
| } |
| } |
| |
| sfbcnt += 1; |
| |
| /* start of corrected version by efs 2003-07-04 */ |
| sfbTemp = sfbcnt; /* from this (short) sfb on we have intensity mode */ |
| /* can have values between 3 (all short sfb in intensity) */ |
| /* and 13 (no short sfb in intensity mode) */ |
| |
| /* first calculate directional factors for intensity stereo, |
| for all sfb in intensity mode, but only |
| if they do not have "illegal" position: */ |
| |
| /* to do this for all sfb we have to get information for last scale factor band: */ |
| /* get factors for last scale factor band: */ |
| /* more than one sfb in intensity mode, |
| copy factors and legal/illegal information from sfb11 to sfb12 */ |
| if (sfbTemp < 12) |
| { |
| (scalefac_R->s[j][12]) = (scalefac_R->s[j][11]); |
| scalefac_IIP_buffer[36 + j] = scalefac_IIP_buffer[33 + j]; /* legal/illegal in sfb 12 same as in sfb 11 */ |
| } |
| else if (sfbTemp == 12) |
| /* only sfb 12 in intensity mode, use factors corresponding to is_pos[12] == 0 */ |
| { |
| (scalefac_R->s[j][12]) = 0; |
| scalefac_IIP_buffer[36 + j] = 1; /* the scf value 0 in sfb12 is "legal" */ |
| } |
| /* if sfbTemp > sfb (no sfb in intensity mode): do nothing */ |
| |
| |
| /* Now process audio samples */ |
| /* first process lower sfb's not in intensity mode */ |
| for (sfb = 0; sfb < sfbTemp; sfb++) |
| { |
| sfbNo = mp3_sfBandIndex[sfreq].s[sfb+1] - mp3_sfBandIndex[sfreq].s[sfb]; |
| sfbStart = 3 * mp3_sfBandIndex[sfreq].s[sfb] + j * sfbNo; |
| |
| if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, sfbStart, sfbNo); |
| } |
| } |
| |
| /* now intensity stereo processing of the remaining sfb's: */ |
| for (sfb = sfbTemp; sfb < 13; sfb++) |
| { |
| sfbNo = mp3_sfBandIndex[sfreq].s[sfb+1] - mp3_sfBandIndex[sfreq].s[sfb]; /* No of lines to process */ |
| sfbStart = 3 * mp3_sfBandIndex[sfreq].s[sfb] + j * sfbNo; |
| |
| if ((uint32)(scalefac_R->s[j][sfb]) != scalefac_IIP_buffer[3*sfb + j]) |
| { |
| pvmp3_st_intensity_ver2(xr, xl, io, scalefac_R->s[j][sfb], sfbStart, sfbNo); |
| } |
| else if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, sfbStart, sfbNo); |
| } |
| } |
| |
| } /* for (j = 0; j < 3; j++) */ |
| |
| } /* end of else ( gr_info->mixed_block_flag) */ |
| |
| } /* if (gr_info->window_switching_flag && (gr_info->block_type == 2)) */ |
| else |
| { |
| /* |
| * long block processing |
| */ |
| i = 31; |
| ss = 17; |
| sb = 0; |
| |
| while (i >= 0) |
| { |
| if (xl[(i*FILTERBANK_BANDS) + ss]) |
| { |
| sb = (i << 4) + (i << 1) + ss; |
| /* i = -1 patched RF 24-09-2002 */ |
| i = -2; |
| } |
| else |
| { |
| ss--; |
| if (ss < 0) |
| { |
| i--; |
| ss = 17; |
| } |
| } |
| } |
| |
| /* patched RF 24-09-2002 */ |
| if (sb) |
| { |
| if (mp3_sfBandIndex[sfreq].l[14] <= sb) |
| { |
| i = 14; |
| } |
| else if (mp3_sfBandIndex[sfreq].l[7] <= sb) |
| { |
| i = 7; |
| } |
| else |
| { |
| i = 0; |
| } |
| |
| while (mp3_sfBandIndex[sfreq].l[i] <= sb) |
| { |
| i++; |
| } |
| } |
| |
| else |
| { |
| if (i == -1) |
| { |
| /* all xr[1][][] are 0: set IS bound sfb to 0 */ |
| i = 0; |
| } |
| else |
| { |
| /* xr[1][0][0] is unequal 0 and all others are 0: set IS bound sfb to 1 */ |
| i = 1; |
| } |
| } |
| /* corrected version by efs 2003-07-04 */ |
| sfbTemp = i; /* from this (long) sfb on we have intensity mode */ |
| /* can have values between 0 (all long sfb in intensity) */ |
| /* and 22 (no long sfb in intensity mode) */ |
| |
| /* first calculate directional factors for intensity stereo, |
| for all sfb in intensity mode, but only if they |
| do not have "illegal" position: */ |
| |
| /* to do this for all sfb we have to get information for last scale factor band: */ |
| if (sfbTemp < 21) |
| /* more than one sfb in intensity mode, */ |
| /* copy factors and legal/illegal information from sfb20 to sfb21 */ |
| { |
| (scalefac_R->l[21]) = (scalefac_R->l[20]); |
| scalefac_IIP_buffer[21] = scalefac_IIP_buffer[20]; /* legal/illegal in sfb 21 same as in sfb 20 */ |
| } |
| else if (sfbTemp == 21) |
| /* only sfb 21 in intensity mode, is_pos[21] = 0 */ |
| { |
| (scalefac_R->l[21]) = 0; |
| scalefac_IIP_buffer[21] = 1; /* the scf value 0 in sfb21 is "legal" */ |
| } |
| /* if sfbTemp > 21 (no sfb in intensity mode): do nothing */ |
| |
| |
| /* Now process audio samples */ |
| /* first process lower sfb's not in intensity mode */ |
| |
| sfbNo = mp3_sfBandIndex[sfreq].l[sfbTemp] - mp3_sfBandIndex[sfreq].l[0]; |
| sfbStart = mp3_sfBandIndex[sfreq].l[0]; |
| |
| if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, sfbStart, sfbNo); |
| } |
| |
| /* now intensity stereo processing of the remaining sfb's: */ |
| for (sfb = sfbTemp; sfb < 22; sfb++) |
| { |
| sfbNo = mp3_sfBandIndex[sfreq].l[sfb+1] - mp3_sfBandIndex[sfreq].l[sfb]; /* number of lines to process */ |
| sfbStart = mp3_sfBandIndex[sfreq].l[sfb]; /* start of sfb */ |
| |
| if ((uint32)(scalefac_R->l[sfb]) != scalefac_IIP_buffer[sfb]) /* "legal" position ? */ |
| { |
| pvmp3_st_intensity_ver2(xr, xl, io, scalefac_R->l[sfb], sfbStart, sfbNo); |
| } |
| else if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, sfbStart, sfbNo); |
| } |
| |
| } /* for (sfb = sfbTemp; sfb < 22; sfb++) */ |
| |
| } /* if (gr_info->window_switching_flag && (gr_info->block_type == 2)) */ |
| |
| } /* if (i_stereo) */ |
| else |
| { |
| /* |
| * normal or ms stereo processing |
| */ |
| if (ms_stereo) |
| { |
| pvmp3_st_mid_side(xr, xl, 0, used_freq_lines); |
| } |
| |
| } /* if (i_stereo) */ |
| |
| } |
| |
| |
| |
| |
