ref: 6de315c5c8219b3b43f05962b72cff50b5db5e60
dir: /common/libsndfile/src/alaw.c/
/* ** Copyright (C) 1999-2000 Erik de Castro Lopo <erikd@zip.com.au> ** ** This program 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. ** ** 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 Lesser General Public License for more details. ** ** You should have received a copy of the GNU Lesser 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. */ #include <unistd.h> #include "sndfile.h" #include "common.h" static void alaw2s_array (unsigned char *buffer, unsigned int count, short *ptr, unsigned int index) ; static void alaw2i_array (unsigned char *buffer, unsigned int count, int *ptr, unsigned int index) ; static void alaw2d_array (unsigned char *buffer, unsigned int count, double *ptr, unsigned int index, double normfact) ; static void s2alaw_array (short *buffer, unsigned int count, unsigned char *ptr, unsigned int index) ; static void i2alaw_array (int *buffer, unsigned int count, unsigned char *ptr, unsigned int index) ; static void d2alaw_array (double *buffer, unsigned int count, unsigned char *ptr, unsigned int index, double normfact) ; int alaw_read_alaw2s (SF_PRIVATE *psf, short *ptr, unsigned int len) { unsigned int readcount, thisread, index = 0 ; int bytecount, bufferlen ; int total = 0 ; bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ; bytecount = len * psf->bytewidth ; while (bytecount > 0) { readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ; thisread = fread (psf->buffer, 1, readcount, psf->file) ; alaw2s_array ((unsigned char*) (psf->buffer), thisread / psf->bytewidth, ptr, index) ; total += thisread ; if (thisread < readcount) break ; index += thisread / psf->bytewidth ; bytecount -= thisread ; } ; total /= psf->bytewidth ; if (total < len) psf->error = SFE_SHORT_READ ; return total ; } /* alaw_read_alaw2s */ int alaw_read_alaw2i (SF_PRIVATE *psf, int *ptr, unsigned int len) { unsigned int readcount, thisread, index = 0 ; int bytecount, bufferlen ; int total = 0 ; bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ; bytecount = len * psf->bytewidth ; while (bytecount > 0) { readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ; thisread = fread (psf->buffer, 1, readcount, psf->file) ; alaw2i_array ((unsigned char*) (psf->buffer), thisread / psf->bytewidth, ptr, index) ; total += thisread ; if (thisread < readcount) break ; index += thisread / psf->bytewidth ; bytecount -= thisread ; } ; total /= psf->bytewidth ; if (total < len) psf->error = SFE_SHORT_READ ; return total ; } /* alaw_read_alaw2i */ int alaw_read_alaw2d (SF_PRIVATE *psf, double *ptr, unsigned int len, int normalize) { unsigned int readcount, thisread, index = 0 ; int bytecount, bufferlen ; int total = 0 ; double normfact ; normfact = (normalize ? 1.0 / ((double) 0x8000) : 1.0) ; bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ; bytecount = len * psf->bytewidth ; while (bytecount > 0) { readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ; thisread = fread (psf->buffer, 1, readcount, psf->file) ; alaw2d_array ((unsigned char*) (psf->buffer), thisread / psf->bytewidth, ptr, index, normfact) ; total += thisread ; if (thisread < readcount) break ; index += thisread / psf->bytewidth ; bytecount -= thisread ; } ; total /= psf->bytewidth ; if (total < len) psf->error = SFE_SHORT_READ ; return total ; } /* alaw_read_alaw2d */ /*============================================================================================= */ int alaw_write_s2alaw (SF_PRIVATE *psf, short *ptr, unsigned int len) { unsigned int writecount, thiswrite, index = 0 ; int bytecount, bufferlen ; int total = 0 ; bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ; bytecount = len * psf->bytewidth ; while (bytecount > 0) { writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ; s2alaw_array (ptr, index, (unsigned char*) (psf->buffer), writecount / psf->bytewidth) ; thiswrite = fwrite (psf->buffer, 1, writecount, psf->file) ; total += thiswrite ; if (thiswrite < writecount) break ; index += thiswrite / psf->bytewidth ; bytecount -= thiswrite ; } ; total /= psf->bytewidth ; if (total < len) psf->error = SFE_SHORT_READ ; return total ; } /* alaw_write_s2alaw */ int alaw_write_i2alaw (SF_PRIVATE *psf, int *ptr, unsigned int len) { unsigned int writecount, thiswrite, index = 0 ; int bytecount, bufferlen ; int total = 0 ; bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ; bytecount = len * psf->bytewidth ; while (bytecount > 0) { writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ; i2alaw_array (ptr, index, (unsigned char*) (psf->buffer), writecount / psf->bytewidth) ; thiswrite = fwrite (psf->buffer, 1, writecount, psf->file) ; total += thiswrite ; if (thiswrite < writecount) break ; index += thiswrite / psf->bytewidth ; bytecount -= thiswrite ; } ; total /= psf->bytewidth ; if (total < len) psf->error = SFE_SHORT_READ ; return total ; } /* alaw_write_i2alaw */ int alaw_write_d2alaw (SF_PRIVATE *psf, double *ptr, unsigned int len, int normalize) { unsigned int writecount, thiswrite, index = 0 ; int bytecount, bufferlen ; int total = 0 ; double normfact ; normfact = (normalize ? ((double) 0x8000) : 1.0) ; bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ; bytecount = len * psf->bytewidth ; while (bytecount > 0) { writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ; d2alaw_array (ptr, index, (unsigned char*) (psf->buffer), writecount / psf->bytewidth, normfact) ; thiswrite = fwrite (psf->buffer, 1, writecount, psf->file) ; total += thiswrite ; if (thiswrite < writecount) break ; index += thiswrite / psf->bytewidth ; bytecount -= thiswrite ; } ; total /= psf->bytewidth ; if (total < len) psf->error = SFE_SHORT_READ ; return total ; } /* alaw_write_d2alaw */ /*============================================================================================= * Private static functions and data. */ static short alaw_decode [128] = { -5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736, -7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784, -2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368, -3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392, -22016, -20992, -24064, -23040, -17920, -16896, -19968, -18944, -30208, -29184, -32256, -31232, -26112, -25088, -28160, -27136, -11008, -10496, -12032, -11520, -8960, -8448, -9984, -9472, -15104, -14592, -16128, -15616, -13056, -12544, -14080, -13568, -344, -328, -376, -360, -280, -264, -312, -296, -472, -456, -504, -488, -408, -392, -440, -424, -88, -72, -120, -104, -24, -8, -56, -40, -216, -200, -248, -232, -152, -136, -184, -168, -1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184, -1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696, -688, -656, -752, -720, -560, -528, -624, -592, -944, -912, -1008, -976, -816, -784, -880, -848 } ; /* alaw_decode */ static unsigned char alaw_encode [2049] = { 0xD5, 0xD4, 0xD7, 0xD6, 0xD1, 0xD0, 0xD3, 0xD2, 0xDD, 0xDC, 0xDF, 0xDE, 0xD9, 0xD8, 0xDB, 0xDA, 0xC5, 0xC4, 0xC7, 0xC6, 0xC1, 0xC0, 0xC3, 0xC2, 0xCD, 0xCC, 0xCF, 0xCE, 0xC9, 0xC8, 0xCB, 0xCA, 0xF5, 0xF5, 0xF4, 0xF4, 0xF7, 0xF7, 0xF6, 0xF6, 0xF1, 0xF1, 0xF0, 0xF0, 0xF3, 0xF3, 0xF2, 0xF2, 0xFD, 0xFD, 0xFC, 0xFC, 0xFF, 0xFF, 0xFE, 0xFE, 0xF9, 0xF9, 0xF8, 0xF8, 0xFB, 0xFB, 0xFA, 0xFA, 0xE5, 0xE5, 0xE5, 0xE5, 0xE4, 0xE4, 0xE4, 0xE4, 0xE7, 0xE7, 0xE7, 0xE7, 0xE6, 0xE6, 0xE6, 0xE6, 0xE1, 0xE1, 0xE1, 0xE1, 0xE0, 0xE0, 0xE0, 0xE0, 0xE3, 0xE3, 0xE3, 0xE3, 0xE2, 0xE2, 0xE2, 0xE2, 0xED, 0xED, 0xED, 0xED, 0xEC, 0xEC, 0xEC, 0xEC, 0xEF, 0xEF, 0xEF, 0xEF, 0xEE, 0xEE, 0xEE, 0xEE, 0xE9, 0xE9, 0xE9, 0xE9, 0xE8, 0xE8, 0xE8, 0xE8, 0xEB, 0xEB, 0xEB, 0xEB, 0xEA, 0xEA, 0xEA, 0xEA, 0x95, 0x95, 0x95, 0x95, 0x95, 0x95, 0x95, 0x95, 0x94, 0x94, 0x94, 0x94, 0x94, 0x94, 0x94, 0x94, 0x97, 0x97, 0x97, 0x97, 0x97, 0x97, 0x97, 0x97, 0x96, 0x96, 0x96, 0x96, 0x96, 0x96, 0x96, 0x96, 0x91, 0x91, 0x91, 0x91, 0x91, 0x91, 0x91, 0x91, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x93, 0x93, 0x93, 0x93, 0x93, 0x93, 0x93, 0x93, 0x92, 0x92, 0x92, 0x92, 0x92, 0x92, 0x92, 0x92, 0x9D, 0x9D, 0x9D, 0x9D, 0x9D, 0x9D, 0x9D, 0x9D, 0x9C, 0x9C, 0x9C, 0x9C, 0x9C, 0x9C, 0x9C, 0x9C, 0x9F, 0x9F, 0x9F, 0x9F, 0x9F, 0x9F, 0x9F, 0x9F, 0x9E, 0x9E, 0x9E, 0x9E, 0x9E, 0x9E, 0x9E, 0x9E, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x9B, 0x9B, 0x9B, 0x9B, 0x9B, 0x9B, 0x9B, 0x9B, 0x9A, 0x9A, 0x9A, 0x9A, 0x9A, 0x9A, 0x9A, 0x9A, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8D, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8C, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8F, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x8E, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8B, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0x8A, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB5, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB4, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB7, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB6, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB1, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB0, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB3, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xB2, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBC, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF, 0xBE, 0xBE, 0xBE, 0xBE, 0xBE, 0xBE, 0xBE, 0xBE, 0xBE, 0xBE, 0xBE, 0xBE, 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0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0x2A } ; /* alaw_encode */ static void alaw2s_array (unsigned char *buffer, unsigned int count, short *ptr, unsigned int index) { int k ; for (k = 0 ; k < count ; k++) { if (buffer [k] & 0x80) ptr [index] = -1 * alaw_decode [((int)buffer [k]) & 0x7F] ; else ptr [index] = alaw_decode [((int)buffer [k]) & 0x7F] ; index ++ ; } ; } /* alaw2s_array */ static void alaw2i_array (unsigned char *buffer, unsigned int count, int *ptr, unsigned int index) { int k ; for (k = 0 ; k < count ; k++) { if (buffer [k] & 0x80) ptr [index] = -1 * alaw_decode [((int)buffer [k]) & 0x7F] ; else ptr [index] = alaw_decode [((int)buffer [k]) & 0x7F] ; index ++ ; } ; } /* alaw2i_array */ static void alaw2d_array (unsigned char *buffer, unsigned int count, double *ptr, unsigned int index, double normfact) { int k ; for (k = 0 ; k < count ; k++) { if (buffer [k] & 0x80) ptr [index] = -normfact * alaw_decode [((int)buffer [k]) & 0x7F] ; else ptr [index] = normfact * alaw_decode [((int)buffer [k]) & 0x7F] ; index ++ ; } ; } /* alaw2d_array */ static void s2alaw_array (short *ptr, unsigned int index, unsigned char *buffer, unsigned int count) { unsigned int k ; for (k = 0 ; k < count ; k++) { if (ptr [index] >= 0) buffer [k] = alaw_encode [ptr [index] / 16] ; else buffer [k] = 0x7F & alaw_encode [ptr [index] / -16] ; index ++ ; } ; } /* s2alaw_array */ static void i2alaw_array (int *ptr, unsigned int index, unsigned char *buffer, unsigned int count) { unsigned int k ; for (k = 0 ; k < count ; k++) { if (ptr [index] >= 0) buffer [k] = alaw_encode [ptr [index] / 16] ; else buffer [k] = 0x7F & alaw_encode [ptr [index] / -16] ; index ++ ; } ; } /* i2alaw_array */ static void d2alaw_array (double *ptr, unsigned int index, unsigned char *buffer, unsigned int count, double normfact) { unsigned int k ; for (k = 0 ; k < count ; k++) { if (ptr [index] >= 0) buffer [k] = alaw_encode [((int) (normfact * ptr [index])) / 16] ; else buffer [k] = 0x7F & alaw_encode [((int) (normfact * ptr [index])) / -16] ; index ++ ; } ; } /* d2alaw_array */