diff options
Diffstat (limited to 'codecs/mp3/src/iupL1.c')
-rwxr-xr-x | codecs/mp3/src/iupL1.c | 330 |
1 files changed, 0 insertions, 330 deletions
diff --git a/codecs/mp3/src/iupL1.c b/codecs/mp3/src/iupL1.c deleted file mode 100755 index 041c2a00b..000000000 --- a/codecs/mp3/src/iupL1.c +++ /dev/null @@ -1,330 +0,0 @@ -/*____________________________________________________________________________ - - FreeAmp - The Free MP3 Player - - MP3 Decoder originally Copyright (C) 1995-1997 Xing Technology - Corp. http://www.xingtech.com - - Portions Copyright (C) 1998-1999 EMusic.com - - This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. - - $Id$ -____________________________________________________________________________*/ - -/**** iupL1.c *************************************************** - -MPEG audio decoder Layer I mpeg1 and mpeg2 -should be portable ANSI C, should be endian independent - -icupL1 integer version of cupL1.c - -******************************************************************/ -/*======================================================================*/ -/* Read Only */ -static int bat_bit_masterL1[] = -{ - 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}; - -/*======================================================================*/ -static void unpack_baL1(MPEGI *m) -{ - int k; - int nstereo; - int n; - - m->iup.bit_skip = 0; - nstereo = m->iup.stereo_sb; - for (k = 0; k < m->iup.nbatL1; k++) - { - mac_load_check(4); - n = m->iup.ballo[k] = m->iup.samp_dispatch[k] = mac_load(4); - if (k >= m->iup.nsb_limit) - m->iup.bit_skip += bat_bit_masterL1[m->iup.samp_dispatch[k]]; - m->iup.c_value[k] = m->iup.look_c_valueL1[n]; - m->iup.c_shift[k] = m->iup.look_c_shiftL1[n]; - if (--nstereo < 0) - { - m->iup.ballo[k + 1] = m->iup.ballo[k]; - m->iup.samp_dispatch[k] += 15; /* flag as joint */ - m->iup.samp_dispatch[k + 1] = m->iup.samp_dispatch[k]; /* flag for sf */ - m->iup.c_value[k + 1] = m->iup.c_value[k]; - m->iup.c_shift[k + 1] = m->iup.c_shift[k]; - k++; - } - } - m->iup.samp_dispatch[m->iup.nsb_limit] = 31; /* terminate the dispatcher with skip */ - m->iup.samp_dispatch[k] = 30; /* terminate the dispatcher */ - -} -/*-------------------------------------------------------------------------*/ -static void unpack_sfL1(MPEGI *m) /* unpack scale factor */ -{ /* combine dequant and scale factors */ - int i, n; - INT32 tmp; /* only reason tmp is 32 bit is to get 32 bit mult result */ - - for (i = 0; i < m->iup.nbatL1; i++) - { - if (m->iup.ballo[i]) - { - mac_load_check(6); - tmp = m->iup.c_value[i]; - n = m->iup.c_shift[i]; - m->iup.cs_factorL1[i] = (tmp * m->iup.sf_table[mac_load(6)]) >> n; - } - } - -/*-- done --*/ -} -/*-------------------------------------------------------------------------*/ -#define UNPACKL1_N(n) s[k] = (m->iup.cs_factorL1[k]*(load(m,n)-((1 << (n-1)) -1)))>>(n-1); \ - goto dispatch; -#define UNPACKL1J_N(n) tmp = (load(m,n)-((1 << (n-1)) -1)); \ - s[k] = (m->iup.cs_factorL1[k]*tmp)>>(n-1); \ - s[k+1] = (m->iup.cs_factorL1[k+1]*tmp)>>(n-1); \ - k++; /* skip right chan dispatch */ \ - goto dispatch; -/*-------------------------------------------------------------------------*/ -static void unpack_sampL1(MPEGI *m) /* unpack samples */ -{ - int j, k; - SAMPLEINT *s; - INT32 tmp; - - s = m->iup.sample; - for (j = 0; j < 12; j++) - { - k = -1; - dispatch:switch (m->iup.samp_dispatch[++k]) - { - case 0: - s[k] = 0; - goto dispatch; - case 1: - UNPACKL1_N(2) /* 3 levels */ - case 2: - UNPACKL1_N(3) /* 7 levels */ - case 3: - UNPACKL1_N(4) /* 15 levels */ - case 4: - UNPACKL1_N(5) /* 31 levels */ - case 5: - UNPACKL1_N(6) /* 63 levels */ - case 6: - UNPACKL1_N(7) /* 127 levels */ - case 7: - UNPACKL1_N(8) /* 255 levels */ - case 8: - UNPACKL1_N(9) /* 511 levels */ - case 9: - UNPACKL1_N(10) /* 1023 levels */ - case 10: - UNPACKL1_N(11) /* 2047 levels */ - case 11: - UNPACKL1_N(12) /* 4095 levels */ - case 12: - UNPACKL1_N(13) /* 8191 levels */ - case 13: - UNPACKL1_N(14) /* 16383 levels */ - case 14: - UNPACKL1_N(15) /* 32767 levels */ -/* -- joint ---- */ - case 15 + 0: - s[k + 1] = s[k] = 0; - k++; /* skip right chan dispatch */ - goto dispatch; -/* -- joint ---- */ - case 15 + 1: - UNPACKL1J_N(2) /* 3 levels */ - case 15 + 2: - UNPACKL1J_N(3) /* 7 levels */ - case 15 + 3: - UNPACKL1J_N(4) /* 15 levels */ - case 15 + 4: - UNPACKL1J_N(5) /* 31 levels */ - case 15 + 5: - UNPACKL1J_N(6) /* 63 levels */ - case 15 + 6: - UNPACKL1J_N(7) /* 127 levels */ - case 15 + 7: - UNPACKL1J_N(8) /* 255 levels */ - case 15 + 8: - UNPACKL1J_N(9) /* 511 levels */ - case 15 + 9: - UNPACKL1J_N(10) /* 1023 levels */ - case 15 + 10: - UNPACKL1J_N(11) /* 2047 levels */ - case 15 + 11: - UNPACKL1J_N(12) /* 4095 levels */ - case 15 + 12: - UNPACKL1J_N(13) /* 8191 levels */ - case 15 + 13: - UNPACKL1J_N(14) /* 16383 levels */ - case 15 + 14: - UNPACKL1J_N(15) /* 32767 levels */ - -/* -- end of dispatch -- */ - case 31: - skip(m, m->iup.bit_skip); - case 30: - s += 64; - } /* end switch */ - } /* end j loop */ - -/*-- done --*/ -} -/*-------------------------------------------------------------------------*/ -static void unpackL1(MPEGI *m) -{ - int prot; - -/* at entry bit getter points at id, sync skipped by caller */ - - load(m,3); /* skip id and option (checked by init) */ - prot = load(m,1); /* load prot bit */ - load(m,6); /* skip to pad */ - m->iup.pad = load(m,1) << 2; - load(m,1); /* skip to mode */ - m->iup.stereo_sb = look_joint[load(m,4)]; - if (prot) - load(m,4); /* skip to data */ - else - load(m,20); /* skip crc */ - - unpack_baL1(m); /* unpack bit allocation */ - unpack_sfL1(m); /* unpack scale factor */ - unpack_sampL1(m); /* unpack samples */ - - -} -/*-------------------------------------------------------------------------*/ - -#ifdef _MSC_VER -#pragma warning(disable: 4056) -#endif - -int i_audio_decode_initL1(MPEGI *m, MPEG_HEAD * h, int framebytes_arg, - int reduction_code, int transform_code, int convert_code, - int freq_limit) -{ - int i, k; - long samprate; - int limit; - int stepbit; - long step; - int bit_code; - -/*--- sf table built by Layer II init ---*/ - - if (m->iup.first_pass_L1) - { - stepbit = 2; - step = 4; - for (i = 1; i < 16; i++) - { - m->iup.look_c_valueL1[i] = (int) (32768.0 * 2.0 / (step - 1)); - m->iup.look_c_shiftL1[i] = 16 - stepbit; - stepbit++; - step <<= 1; - } - m->iup.first_pass_L1 = 0; - } - - m->iup.unpack_routine = unpackL1; - - - transform_code = transform_code; /* not used, asm compatability */ - bit_code = 0; - if (convert_code & 8) - bit_code = 1; - convert_code = convert_code & 3; /* higher bits used by dec8 freq cvt */ - if (reduction_code < 0) - reduction_code = 0; - if (reduction_code > 2) - reduction_code = 2; - if (freq_limit < 1000) - freq_limit = 1000; - - - m->iup.framebytes = framebytes_arg; -/* check if code handles */ - if (h->option != 3) - return 0; /* layer I only */ - - m->iup.nbatL1 = 32; - m->iup.max_sb = m->iup.nbatL1; -/*----- compute nsb_limit --------*/ - samprate = sr_table[4 * h->id + h->sr_index]; - m->iup.nsb_limit = (freq_limit * 64L + samprate / 2) / samprate; -/*- caller limit -*/ -/*---- limit = 0.94*(32>>reduction_code); ----*/ - limit = (32 >> reduction_code); - if (limit > 8) - limit--; - if (m->iup.nsb_limit > limit) - m->iup.nsb_limit = limit; - if (m->iup.nsb_limit > m->iup.max_sb) - m->iup.nsb_limit = m->iup.max_sb; - - m->iup.outvalues = 384 >> reduction_code; - if (h->mode != 3) - { /* adjust for 2 channel modes */ - m->iup.nbatL1 *= 2; - m->iup.max_sb *= 2; - m->iup.nsb_limit *= 2; - } - -/* set sbt function */ - m->iup.nsbt = 12; - k = 1 + convert_code; - if (h->mode == 3) - { - k = 0; - } - m->iup.sbt = sbt_table[bit_code][reduction_code][k]; - m->iup.outvalues *= out_chans[k]; - if (bit_code != 0) - m->iup.outbytes = m->iup.outvalues; - else - m->iup.outbytes = sizeof(short) * m->iup.outvalues; - - m->iup.decinfo.channels = out_chans[k]; - m->iup.decinfo.outvalues = m->iup.outvalues; - m->iup.decinfo.samprate = samprate >> reduction_code; - if (bit_code != 0) - m->iup.decinfo.bits = 8; - else - m->iup.decinfo.bits = sizeof(short) * 8; - - m->iup.decinfo.framebytes = m->iup.framebytes; - m->iup.decinfo.type = 0; - - -/* clear sample buffer, unused sub bands must be 0 */ - for (i = 0; i < 768; i++) - m->iup.sample[i] = 0; - - -/* init sub-band transform */ - i_sbt_init(); - - return 1; -} - -#ifdef _MSC_VER -#pragma warning(default: 4056) -#endif - -/*---------------------------------------------------------*/ |