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Diffstat (limited to 'include/asterisk/fskmodem.h')
-rw-r--r-- | include/asterisk/fskmodem.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/include/asterisk/fskmodem.h b/include/asterisk/fskmodem.h new file mode 100644 index 000000000..e6d1a5419 --- /dev/null +++ b/include/asterisk/fskmodem.h @@ -0,0 +1,72 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 1999 - 2005, Digium, Inc. + * + * Mark Spencer <markster@digium.com> + * + * See http://www.asterisk.org for more information about + * the Asterisk project. Please do not directly contact + * any of the maintainers of this project for assistance; + * the project provides a web site, mailing lists and IRC + * channels for your use. + * + * This program is free software, distributed under the terms of + * the GNU General Public License Version 2. See the LICENSE file + * at the top of the source tree. + */ + +/*! \file + * \brief FSK Modem Support + * \note Includes code and algorithms from the Zapata library. + * \todo Translate Emiliano Zapata's spanish comments to english, please. + */ + +#ifndef _ASTERISK_FSKMODEM_H +#define _ASTERISK_FSKMODEM_H + +#define PARITY_NONE 0 +#define PARITY_EVEN 1 +#define PARITY_ODD 2 + + +#define NCOLA 0x4000 + +typedef struct { + float spb; /*!< Samples / Bit */ + int nbit; /*!< Number of Data Bits (5,7,8) */ + float nstop; /*!< Number of Stop Bits 1,1.5,2 */ + int paridad; /*!< Parity 0=none 1=even 2=odd */ + int hdlc; /*!< Modo Packet */ + float x0; + float x1; + float x2; + float cont; + int bw; /*!< Ancho de Banda */ + double fmxv[8],fmyv[8]; /*!< filter stuff for M filter */ + int fmp; /*!< pointer for M filter */ + double fsxv[8],fsyv[8]; /*!< filter stuff for S filter */ + int fsp; /*!< pointer for S filter */ + double flxv[8],flyv[8]; /*!< filter stuff for L filter */ + int flp; /*!< pointer for L filter */ + int f_mark_idx; /*!< Indice de frecuencia de marca (f_M-500)/5 */ + int f_space_idx; /*!< Indice de frecuencia de espacio (f_S-500)/5 */ + int state; + int pcola; /*!< Puntero de las colas de datos */ + float cola_in[NCOLA]; /*!< Cola de muestras de entrada */ + float cola_filtro[NCOLA]; /*!< Cola de muestras tras filtros */ + float cola_demod[NCOLA]; /*!< Cola de muestras demoduladas */ +} fsk_data; + +/* \brief Retrieve a serial byte into outbyte. + Buffer is a pointer into a series of + shorts and len records the number of bytes in the buffer. len will be + overwritten with the number of bytes left that were not consumed. + \return return value is as follows: + \arg 0: Still looking for something... + \arg 1: An output byte was received and stored in outbyte + \arg -1: An error occured in the transmission + He must be called with at least 80 bytes of buffer. */ +int fsk_serie(fsk_data *fskd, short *buffer, int *len, int *outbyte); + +#endif /* _ASTERISK_FSKMODEM_H */ |