/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 1992-2001 by Sun Microsystems, Inc. * All rights reserved. */ #ifndef _MULTIMEDIA_AUDIO_ENCODE_H #define _MULTIMEDIA_AUDIO_ENCODE_H #ifdef __cplusplus extern "C" { #endif #include <audio_types.h> #include <audio_hdr.h> /* * audio_encode.h * * u-law, A-law and linear PCM conversion tables and macros. */ /* PCM linear <-> a-law conversion tables */ extern short _alaw2linear[]; /* 8-bit a-law to 16-bit PCM */ extern unsigned char *_linear2alaw; /* 13-bit PCM to 8-bit a-law */ /* PCM linear <-> u-law conversion tables */ extern short _ulaw2linear[]; /* 8-bit u-law to 16-bit PCM */ extern unsigned char *_linear2ulaw; /* 14-bit PCM to 8-bit u-law */ /* A-law <-> u-law conversion tables */ extern unsigned char _alaw2ulaw[]; /* 8-bit A-law to 8-bit u-law */ extern unsigned char _ulaw2alaw[]; /* 8-bit u-law to 8-bit A-law */ /* PCM linear <-> a-law conversion macros */ /* a-law to 8,16,32-bit linear */ #define audio_a2c(X) ((char)(_alaw2linear[(unsigned char) (X)] >> 8)) #define audio_a2s(X) (_alaw2linear[(unsigned char) (X)]) #define audio_a2l(X) (((long)_alaw2linear[(unsigned char) (X)]) << 16) /* 8,16,32-bit linear to a-law */ #define audio_c2a(X) (_linear2alaw[((short)(X)) << 5]) #define audio_s2a(X) (_linear2alaw[((short)(X)) >> 3]) #define audio_l2a(X) (_linear2alaw[((long)(X)) >> 19]) /* PCM linear <-> u-law conversion macros */ /* u-law to 8,16,32-bit linear */ #define audio_u2c(X) ((char)(_ulaw2linear[(unsigned char) (X)] >> 8)) #define audio_u2s(X) (_ulaw2linear[(unsigned char) (X)]) #define audio_u2l(X) (((long)_ulaw2linear[(unsigned char) (X)]) << 16) /* 8,16,32-bit linear to u-law */ #define audio_c2u(X) (_linear2ulaw[((short)(X)) << 6]) #define audio_s2u(X) (_linear2ulaw[((short)(X)) >> 2]) #define audio_l2u(X) (_linear2ulaw[((long)(X)) >> 18]) /* A-law <-> u-law conversion macros */ #define audio_a2u(X) (_alaw2ulaw[(unsigned char)(X)]) #define audio_u2a(X) (_ulaw2alaw[(unsigned char)(X)]) /* * external declarations, type definitions and * macro definitions for use with the G.721 routines. */ /* * The following is the definition of the state structure * used by the G.721/G.723 encoder and decoder to preserve their internal * state between successive calls. The meanings of the majority * of the state structure fields are explained in detail in the * CCITT Recommendation G.721. The field names are essentially indentical * to variable names in the bit level description of the coding algorithm * included in this Recommendation. */ struct audio_g72x_state { long yl; /* Locked or steady state step size multiplier. */ short yu; /* Unlocked or non-steady state step size multiplier. */ short dms; /* Short term energy estimate. */ short dml; /* Long term energy estimate. */ short ap; /* Linear weighting coefficient of 'yl' and 'yu'. */ short a[2]; /* Coefficients of pole portion of prediction filter. */ short b[6]; /* Coefficients of zero portion of prediction filter. */ short pk[2]; /* * Signs of previous two samples of a partially * reconstructed signal. */ short dq[6]; /* * Previous 6 samples of the quantized difference * signal represented in an internal floating point * format. */ short sr[2]; /* * Previous 2 samples of the quantized difference * signal represented in an internal floating point * format. */ char td; /* delayed tone detect, new in 1988 version */ unsigned char leftover[8]; /* * This array is used to store the last unpackable * code bits in the event that the number of code bits * which must be packed into a byte stream is not a * multiple of the sample unit size. */ char leftover_cnt; /* * Flag indicating the number of bits stored in * 'leftover'. Reset to 0 upon packing of 'leftover'. */ }; /* External tables. */ /* Look-up table for performing fast log based 2. */ extern unsigned char _fmultanexp[]; /* Look-up table for perfoming fast 6bit by 6bit multiplication. */ extern unsigned char _fmultwanmant[]; /* * Look-up table for performing fast quantization of the step size * scale factor normalized log magnitude of the difference signal. */ extern unsigned char _quani[]; /* External function definitions. */ EXTERN_FUNCTION(void g721_init_state, (struct audio_g72x_state *state_ptr)); EXTERN_FUNCTION(int g721_encode, ( void *in_buf, int data_size, Audio_hdr *in_header, unsigned char *out_buf, int *out_size, struct audio_g72x_state *state_ptr)); EXTERN_FUNCTION(int g721_decode, ( unsigned char *in_buf, int data_size, Audio_hdr *out_header, void *out_buf, int *out_size, struct audio_g72x_state *state_ptr)); /* * Look-up table for performing fast quantization of the step size * scale factor normalized log magnitude of the difference signal. */ extern unsigned char _g723quani[]; /* External function definitions. */ EXTERN_FUNCTION(void g723_init_state, (struct audio_g72x_state *state_ptr)); EXTERN_FUNCTION(int g723_encode, ( void *in_buf, int data_size, Audio_hdr *out_header, unsigned char *out_buf, int *out_size, struct audio_g72x_state *state_ptr)); EXTERN_FUNCTION(int g723_decode, ( unsigned char *in_buf, int data_size, Audio_hdr *out_header, void *out_buf, int *out_size, struct audio_g72x_state *state_ptr)); #ifdef __cplusplus } #endif #endif /* !_MULTIMEDIA_AUDIO_ENCODE_H */
