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direwolf/audio.h
WB2OSZ 8978f2de6c Version 1.0 - Initial commit 
Changes to be committed:
	new file:   .gitattributes
	new file:   .gitignore
	new file:   APRStt-Implementation-Notes.pdf
	new file:   CHANGES.txt
	new file:   LICENSE-dire-wolf.txt
	new file:   LICENSE-other.txt
	new file:   Makefile.linux
	new file:   Makefile.win
	new file:   Quick-Start-Guide-Windows.pdf
	new file:   Raspberry-Pi-APRS.pdf
	new file:   User-Guide.pdf
	new file:   aclients.c
	new file:   aprs_tt.c
	new file:   aprs_tt.h
	new file:   atest.c
	new file:   audio.c
	new file:   audio.h
	new file:   audio_win.c
	new file:   ax25_pad.c
	new file:   ax25_pad.h
	new file:   beacon.c
	new file:   beacon.h
	new file:   config.c
	new file:   config.h
	new file:   decode_aprs.c
	new file:   decode_aprs.h
	new file:   dedupe.c
	new file:   dedupe.h
	new file:   demod.c
	new file:   demod.h
	new file:   demod_9600.c
	new file:   demod_9600.h
	new file:   demod_afsk.c
	new file:   demod_afsk.h
	new file:   digipeater.c
	new file:   digipeater.h
	new file:   direwolf.c
	new file:   direwolf.conf
	new file:   direwolf.desktop
	new file:   direwolf.h
	new file:   dsp.c
	new file:   dsp.h
	new file:   dtmf.c
	new file:   dtmf.h
	new file:   dw-icon.ico
	new file:   dw-icon.png
	new file:   dw-icon.rc
	new file:   dw-start.sh
	new file:   dwgps.c
	new file:   dwgps.h
	new file:   encode_aprs.c
	new file:   encode_aprs.h
	new file:   fcs_calc.c
	new file:   fcs_calc.h
	new file:   fsk_demod_agc.h
	new file:   fsk_demod_state.h
	new file:   fsk_filters.h
	new file:   fsk_gen_filter.h
	new file:   gen_packets.c
	new file:   gen_tone.c
	new file:   gen_tone.h
	new file:   hdlc_rec.c
	new file:   hdlc_rec.h
	new file:   hdlc_rec2.c
	new file:   hdlc_rec2.h
	new file:   hdlc_send.c
	new file:   hdlc_send.h
	new file:   igate.c
	new file:   igate.h
	new file:   kiss.c
	new file:   kiss.h
	new file:   kiss_frame.c
	new file:   kiss_frame.h
	new file:   kissnet.c
	new file:   kissnet.h
	new file:   latlong.c
	new file:   latlong.h
	new file:   ll2utm.c
	new file:   misc/README-dire-wolf.txt
	new file:   misc/strcasestr.c
	new file:   misc/strsep.c
	new file:   misc/strtok_r.c
	new file:   morse.c
	new file:   multi_modem.c
	new file:   multi_modem.h
	new file:   ptt.c
	new file:   ptt.h
	new file:   pttest.c
	new file:   rdq.c
	new file:   rdq.h
	new file:   redecode.c
	new file:   redecode.h
	new file:   regex/COPYING
	new file:   regex/INSTALL
	new file:   regex/LICENSES
	new file:   regex/NEWS
	new file:   regex/README
	new file:   regex/README-dire-wolf.txt
	new file:   regex/re_comp.h
	new file:   regex/regcomp.c
	new file:   regex/regex.c
	new file:   regex/regex.h
	new file:   regex/regex_internal.c
	new file:   regex/regex_internal.h
	new file:   regex/regexec.c
	new file:   rrbb.c
	new file:   rrbb.h
	new file:   server.c
	new file:   server.h
	new file:   symbols-new.txt
	new file:   symbols.c
	new file:   symbols.h
	new file:   symbolsX.txt
	new file:   textcolor.c
	new file:   textcolor.h
	new file:   tocalls.txt
	new file:   tq.c
	new file:   tq.h
	new file:   tt_text.c
	new file:   tt_text.h
	new file:   tt_user.c
	new file:   tt_user.h
	new file:   tune.h
	new file:   udp_test.c
	new file:   utm/LatLong-UTMconversion.c
	new file:   utm/LatLong-UTMconversion.h
	new file:   utm/README.txt
	new file:   utm/SwissGrid.cpp
	new file:   utm/UTMConversions.cpp
	new file:   utm/constants.h
	new file:   utm2ll.c
	new file:   version.h
	new file:   xmit.c
	new file:   xmit.h
2015-07-26 20:35:07 -04:00

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/*------------------------------------------------------------------
*
* Module: audio.h
*
* Purpose: Interface to audio device commonly called a "sound card."
*
*---------------------------------------------------------------*/
#ifndef AUDIO_H
#define AUDIO_H 1
#include "direwolf.h" /* for MAX_CHANS used throughout the application. */
#include "hdlc_rec2.h" /* for enum retry_e */
/*
* PTT control.
*/
enum ptt_method_e {
PTT_METHOD_NONE, /* VOX or no transmit. */
PTT_METHOD_SERIAL, /* Serial port RTS or DTR. */
PTT_METHOD_GPIO }; /* General purpos I/O. */
typedef enum ptt_method_e ptt_method_t;
enum ptt_line_e { PTT_LINE_RTS = 1, PTT_LINE_DTR = 2 };
typedef enum ptt_line_e ptt_line_t;
enum audio_in_type_e {
AUDIO_IN_TYPE_SOUNDCARD,
AUDIO_IN_TYPE_SDR_UDP,
AUDIO_IN_TYPE_STDIN };
struct audio_s {
/* Properites of the sound device. */
char adevice_in[80]; /* Name of the audio input device (or file?). */
/* TODO: Can be "-" to read from stdin. */
char adevice_out[80]; /* Name of the audio output device (or file?). */
int num_channels; /* Should be 1 for mono or 2 for stereo. */
int samples_per_sec; /* Audio sampling rate. Typically 11025, 22050, or 44100. */
int bits_per_sample; /* 8 (unsigned char) or 16 (signed short). */
enum audio_in_type_e audio_in_type;
/* Where is input (receive) audio coming from? */
/* Common to all channels. */
enum retry_e fix_bits; /* Level of effort to recover from */
/* a bad FCS on the frame. */
/* Properties for each audio channel, common to receive and transmit. */
/* Can be different for each radio channel. */
enum modem_t {AFSK, NONE, SCRAMBLE} modem_type[MAX_CHANS];
/* Usual AFSK. */
/* Baseband signal. */
/* Scrambled http://www.amsat.org/amsat/articles/g3ruh/109/fig03.gif */
int decimate[MAX_CHANS]; /* Reduce AFSK sample rate by this factor to */
/* decrease computational requirements. */
int mark_freq[MAX_CHANS]; /* Two tones for AFSK modulation, in Hz. */
int space_freq[MAX_CHANS]; /* Standard tones are 1200 and 2200 for 1200 baud. */
int baud[MAX_CHANS]; /* Data bits (more accurately, symbols) per second. */
/* Standard rates are 1200 for VHF and 300 for HF. */
char profiles[MAX_CHANS][16]; /* 1 or more of ABC etc. */
int num_freq[MAX_CHANS]; /* Number of different frequency pairs for decoders. */
int offset[MAX_CHANS]; /* Spacing between filter frequencies. */
int num_subchan[MAX_CHANS]; /* Total number of modems / hdlc decoders for each channel. */
/* Potentially it could be product of strlen(profiles) * num_freq. */
/* Currently can't use both at once. */
/* Additional properties for transmit. */
ptt_method_t ptt_method[MAX_CHANS]; /* serial port or GPIO. */
char ptt_device[MAX_CHANS][20]; /* Serial device name for PTT. e.g. COM1 or /dev/ttyS0 */
ptt_line_t ptt_line[MAX_CHANS]; /* Control line wehn using serial port. */
/* PTT_RTS, PTT_DTR. */
int ptt_gpio[MAX_CHANS]; /* GPIO number. */
int ptt_invert[MAX_CHANS]; /* Invert the output. */
int slottime[MAX_CHANS]; /* Slot time in 10 mS units for persistance algorithm. */
/* Typical value is 10 meaning 100 milliseconds. */
int persist[MAX_CHANS]; /* Sets probability for transmitting after each */
/* slot time delay. Transmit if a random number */
/* in range of 0 - 255 <= persist value. */
/* Otherwise wait another slot time and try again. */
/* Default value is 63 for 25% probability. */
int txdelay[MAX_CHANS]; /* After turning on the transmitter, */
/* send "flags" for txdelay * 10 mS. */
/* Default value is 30 meaning 300 milliseconds. */
int txtail[MAX_CHANS]; /* Amount of time to keep transmitting after we */
/* are done sending the data. This is to avoid */
/* dropping PTT too soon and chopping off the end */
/* of the frame. Again 10 mS units. */
/* At this point, I'm thinking of 10 as the default. */
};
#if __WIN32__
#define DEFAULT_ADEVICE "" /* Windows: Empty string = default audio device. */
#else
#if USE_ALSA
#define DEFAULT_ADEVICE "default" /* Use default device for ALSA. */
#else
#define DEFAULT_ADEVICE "/dev/dsp" /* First audio device for OSS. */
#endif
#endif
/*
* UDP audio receiving port. Couldn't find any standard or usage precedent.
* Got the number from this example: http://gqrx.dk/doc/streaming-audio-over-udp
* Any better suggestions?
*/
#define DEFAULT_UDP_AUDIO_PORT 7355
// Maximum size of the UDP buffer (for allowing IP routing, udp packets are often limited to 1472 bytes)
#define SDR_UDP_BUF_MAXLEN 2000
#define DEFAULT_NUM_CHANNELS 1
#define DEFAULT_SAMPLES_PER_SEC 44100 /* Very early observations. Might no longer be valid. */
/* 22050 works a lot better than 11025. */
/* 44100 works a little better than 22050. */
/* If you have a reasonable machine, use the highest rate. */
#define MIN_SAMPLES_PER_SEC 8000
#define MAX_SAMPLES_PER_SEC 48000 /* Formerly 44100. */
/* Software defined radio often uses 48000. */
#define DEFAULT_BITS_PER_SAMPLE 16
#define DEFAULT_FIX_BITS RETRY_SINGLE
/*
* Standard for AFSK on VHF FM.
* Reversing mark and space makes no difference because
* NRZI encoding only cares about change or lack of change
* between the two tones.
*
* HF SSB uses 300 baud and 200 Hz shift.
* 1600 & 1800 Hz is a popular tone pair, sometimes
* called the KAM tones.
*/
#define DEFAULT_MARK_FREQ 1200
#define DEFAULT_SPACE_FREQ 2200
#define DEFAULT_BAUD 1200
/*
* Typical transmit timings for VHF.
*/
#define DEFAULT_SLOTTIME 10
#define DEFAULT_PERSIST 63
#define DEFAULT_TXDELAY 30
#define DEFAULT_TXTAIL 10 /* not sure yet. */
/*
* Note that we have two versions of these in audio.c and audio_win.c.
* Use one or the other depending on the platform.
*/
int audio_open (struct audio_s *pa);
int audio_get (void);
int audio_put (int c);
int audio_flush (void);
int audio_wait (int duration);
int audio_close (void);
#endif /* ifdef AUDIO_H */
/* end audio.h */
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