/* libSoX ima_rw.h -- codex utilities for WAV_FORMAT_IMA_ADPCM * Copyright (C) 1999 Stanley J. Brooks <stabro@megsinet.net> * * This library 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 library 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 library; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA */ #include "sox.h" #ifndef SAMPL#define SAMPL short#endif /* * call lsx_ima_init_table() before any other Ima* functions, * to create the fast lookup tables */extern void lsx_ima_init_table(void); /* lsx_ima_block_expand_i() outputs interleaved samples into one output buffer */extern void lsx_ima_block_expand_i(	unsigned chans,          /* total channels             */	const unsigned char *ibuff,/* input buffer[blockAlign]   */	SAMPL *obuff,       /* output samples, n*chans    */	int n               /* samples to decode PER channel, REQUIRE n % 8 == 1  */); /* lsx_ima_block_expand_m() outputs non-interleaved samples into chan separate output buffers */extern void lsx_ima_block_expand_m(	unsigned chans,          /* total channels             */	const unsigned char *ibuff,/* input buffer[blockAlign]   */	SAMPL **obuffs,     /* chan output sample buffers, each takes n samples */	int n               /* samples to decode PER channel, REQUIRE n % 8 == 1  */); /* mash one block.  if you want to use opt>0, 9 is a reasonable value */extern void lsx_ima_block_mash_i(	unsigned chans,          /* total channels */	const SAMPL *ip,    /* ip[] is interleaved input samples */	int n,              /* samples to encode PER channel, REQUIRE n % 8 == 1 */	int *st,            /* input/output state[chans], REQUIRE 0 <= st[ch] <= ISSTMAX */	unsigned char *obuff, /* output buffer[blockAlign] */	int opt             /* non-zero allows some cpu-intensive code to improve output */); /* Some helper functions for computing samples/block and blockalign */ /* * lsx_ima_samples_in(dataLen, chans, blockAlign, samplesPerBlock) *  returns the number of samples/channel which would go *  in the dataLen, given the other parameters ... *  if input samplesPerBlock is 0, then returns the max *  samplesPerBlock which would go into a block of size blockAlign *  Yes, it is confusing usage. */extern size_t lsx_ima_samples_in(	size_t dataLen,	size_t chans,	size_t blockAlign,	size_t samplesPerBlock); /* * size_t lsx_ima_bytes_per_block(chans, samplesPerBlock) *   return minimum blocksize which would be required *   to encode number of chans with given samplesPerBlock */extern size_t lsx_ima_bytes_per_block(	size_t chans,	size_t samplesPerBlock);