private/tone_generate.h

00001 /*
00002  * SpanDSP - a series of DSP components for telephony
00003  *
00004  * private/tone_generate.h - General telephony tone generation.
00005  *
00006  * Written by Steve Underwood <steveu@coppice.org>
00007  *
00008  * Copyright (C) 2001 Steve Underwood
00009  *
00010  * All rights reserved.
00011  *
00012  * This program is free software; you can redistribute it and/or modify
00013  * it under the terms of the GNU Lesser General Public License version 2.1,
00014  * as published by the Free Software Foundation.
00015  *
00016  * This program is distributed in the hope that it will be useful,
00017  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019  * GNU Lesser General Public License for more details.
00020  *
00021  * You should have received a copy of the GNU Lesser General Public
00022  * License along with this program; if not, write to the Free Software
00023  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00024  */
00025 
00026 #if !defined(_SPANDSP_PRIVATE_TONE_GENERATE_H_)
00027 #define _SPANDSP_PRIVATE_TONE_GENERATE_H_
00028 
00029 struct tone_gen_tone_descriptor_s
00030 {
00031     int32_t phase_rate;
00032 #if defined(SPANDSP_USE_FIXED_POINT)
00033     int16_t gain;
00034 #else
00035     float gain;
00036 #endif
00037 };
00038 
00039 /*!
00040     Cadenced multi-tone generator descriptor.
00041 */
00042 struct tone_gen_descriptor_s
00043 {
00044     tone_gen_tone_descriptor_t tone[4];
00045     int duration[4];
00046     int repeat;
00047 };
00048 
00049 /*!
00050     Cadenced multi-tone generator state descriptor. This defines the state of
00051     a single working instance of a generator.
00052 */
00053 struct tone_gen_state_s
00054 {
00055     tone_gen_tone_descriptor_t tone[4];
00056 
00057     uint32_t phase[4];
00058     int duration[4];
00059     int repeat;
00060 
00061     int current_section;
00062     int current_position;
00063 };
00064 
00065 #endif
00066 /*- End of file ------------------------------------------------------------*/

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