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direwolf/audio.h

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/*------------------------------------------------------------------
*
* Module: audio.h
*
* Purpose: Interface to audio device commonly called a "sound card"
* for historical reasons.
*
*---------------------------------------------------------------*/
#ifndef AUDIO_H
#define AUDIO_H 1
#ifdef USE_HAMLIB
#include <hamlib/rig.h>
#endif
#include "direwolf.h" /* for MAX_CHANS used throughout the application. */
#include "ax25_pad.h" /* for AX25_MAX_ADDR_LEN */
/*
* 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 purpose I/O, Linux only. */
PTT_METHOD_LPT, /* Parallel printer port, Linux only. */
PTT_METHOD_HAMLIB, /* HAMLib, Linux only. */
PTT_METHOD_CM108 }; /* GPIO pin of CM108/CM119/etc. Linux only. */
typedef enum ptt_method_e ptt_method_t;
enum ptt_line_e { PTT_LINE_NONE = 0, PTT_LINE_RTS = 1, PTT_LINE_DTR = 2 }; // Important: 0 for neither.
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 };
/* For option to try fixing frames with bad CRC. */
typedef enum retry_e {
RETRY_NONE=0,
RETRY_INVERT_SINGLE=1,
RETRY_INVERT_DOUBLE=2,
RETRY_INVERT_TRIPLE=3,
RETRY_INVERT_TWO_SEP=4,
RETRY_MAX = 5} retry_t;
// Type of communication medium associated with the channel.
enum medium_e { MEDIUM_NONE = 0, // Channel is not valid for use.
MEDIUM_RADIO, // Internal modem for radio.
MEDIUM_IGATE, // Access IGate as ordinary channel.
MEDIUM_NETTNC }; // Remote network TNC. (possible future)
typedef enum sanity_e { SANITY_APRS, SANITY_AX25, SANITY_NONE } sanity_t;
struct audio_s {
/* Previously we could handle only a single audio device. */
/* In version 1.2, we generalize this to handle multiple devices. */
/* This means we can now have more than 2 radio channels. */
struct adev_param_s {
/* Properites of the sound device. */
int defined; /* Was device defined? */
/* First one defaults to yes. */
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). */
} adev[MAX_ADEVS];
/* Common to all channels. */
char tts_script[80]; /* Script for text to speech. */
int statistics_interval; /* Number of seconds between the audio */
/* statistics reports. This is set by */
/* the "-a" option. 0 to disable feature. */
int xmit_error_rate; /* For testing purposes, we can generate frames with an invalid CRC */
/* to simulate corruption while going over the air. */
/* This is the probability, in per cent, of randomly corrupting it. */
/* Normally this is 0. 25 would mean corrupt it 25% of the time. */
int recv_error_rate; /* Similar but the % probablity of dropping a received frame. */
char timestamp_format[40]; /* -T option */
/* Precede received & transmitted frames with timestamp. */
/* Command line option uses "strftime" format string. */
/* Properties for each channel, common to receive and transmit. */
/* Can be different for each radio channel. */
/* originally a "channel" was always connected to an internal modem. */
/* In version 1.6, this is generalized so that a channel (as seen by client application) */
/* can be connected to something else. Initially, this will allow application */
/* access to the IGate. Later we might have network TNCs or other internal functions. */
struct achan_param_s {
// Originally there was a boolean, called "valid", to indicate that the
// channel is valid. This has been replaced with the new "medium" which
// will allow channels to correspond to things other than internal modems.
enum medium_e medium; // MEDIUM_NONE for invalid.
// MEDIUM_RADIO for internal modem. (only possibility earlier)
// MEDIUM_IGATE allows application access to IGate.
char mycall[AX25_MAX_ADDR_LEN]; /* Call associated with this radio channel. */
/* Could all be the same or different. */
enum modem_t { MODEM_AFSK, MODEM_BASEBAND, MODEM_SCRAMBLE, MODEM_QPSK, MODEM_8PSK, MODEM_OFF, MODEM_16_QAM, MODEM_64_QAM } modem_type;
/* Usual AFSK. */
/* Baseband signal. Not used yet. */
/* Scrambled http://www.amsat.org/amsat/articles/g3ruh/109/fig03.gif */
/* Might try MFJ-2400 / CCITT v.26 / Bell 201 someday. */
/* No modem. Might want this for DTMF only channel. */
enum dtmf_decode_t { DTMF_DECODE_OFF, DTMF_DECODE_ON } dtmf_decode;
/* Originally the DTMF ("Touch Tone") decoder was always */
/* enabled because it took a negligible amount of CPU. */
/* There were complaints about the false positives when */
/* hearing other modulation schemes on HF SSB so now it */
/* is enabled only when needed. */
/* "On" will send special "t" packet to attached applications */
/* and process as APRStt. Someday we might want to separate */
/* these but for now, we have a single off/on. */
int decimate; /* Reduce AFSK sample rate by this factor to */
/* decrease computational requirements. */
int upsample; /* Upsample by this factor for G3RUH. */
int interleave; /* If > 1, interleave samples among multiple decoders. */
/* Quick hack for experiment. */
int mark_freq; /* Two tones for AFSK modulation, in Hz. */
int space_freq; /* Standard tones are 1200 and 2200 for 1200 baud. */
int baud; /* Data bits per second. */
/* Standard rates are 1200 for VHF and 300 for HF. */
/* This should really be called bits per second. */
/* Next 3 come from config file or command line. */
char profiles[16]; /* zero or more of ABC etc, optional + */
int num_freq; /* Number of different frequency pairs for decoders. */
int offset; /* Spacing between filter frequencies. */
int num_slicers; /* Number of different threshold points to decide */
/* between mark or space. */
/* This is derived from above by demod_init. */
int num_subchan; /* Total number of modems for each channel. */
/* These are for dealing with imperfect frames. */
enum retry_e fix_bits; /* Level of effort to recover from */
/* a bad FCS on the frame. */
/* 0 = no effort */
/* 1 = try fixing a single bit */
/* 2... = more techniques... */
enum sanity_e sanity_test; /* Sanity test to apply when finding a good */
/* CRC after making a change. */
/* Must look like APRS, AX.25, or anything. */
int passall; /* Allow thru even with bad CRC. */
/* Additional properties for transmit. */
/* Originally we had control outputs only for PTT. */
/* In version 1.2, we generalize this to allow others such as DCD. */
/* In version 1.4 we add CON for connected to another station. */
/* Index following structure by one of these: */
#define OCTYPE_PTT 0
#define OCTYPE_DCD 1
#define OCTYPE_CON 2
#define NUM_OCTYPES 3 /* number of values above. i.e. last value +1. */
struct {
ptt_method_t ptt_method; /* none, serial port, GPIO, LPT, HAMLIB, CM108. */
char ptt_device[100]; /* Serial device name for PTT. e.g. COM1 or /dev/ttyS0 */
/* Also used for HAMLIB. Could be host:port when model is 1. */
/* For years, 20 characters was plenty then we start getting extreme names like this: */
/* /dev/serial/by-id/usb-FTDI_Navigator__CAT___2nd_PTT__00000000-if00-port0 */
/* /dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller_D-if00-port0 */
/* Issue 104, changed to 100 bytes in version 1.5. */
/* This same field is also used for CM108 GPIO PTT which will */
/* have a name like /dev/hidraw1. */
ptt_line_t ptt_line; /* Control line when using serial port. PTT_LINE_RTS, PTT_LINE_DTR. */
ptt_line_t ptt_line2; /* Optional second one: PTT_LINE_NONE when not used. */
int out_gpio_num; /* GPIO number. Originally this was only for PTT. */
/* It is now more general. */
/* octrl array is indexed by PTT, DCD, or CONnected indicator. */
/* For CM108, this should be in range of 1-8. */
#define MAX_GPIO_NAME_LEN 20 // 12 would cover any case I've seen so this should be safe
char out_gpio_name[MAX_GPIO_NAME_LEN];
/* orginally, gpio number NN was assumed to simply */
/* have the name gpioNN but this turned out not to be */
/* the case for CubieBoard where it was longer. */
/* This is filled in by ptt_init so we don't have to */
/* recalculate it each time we access it. */
/* This could probably be collapsed into ptt_device instead of being separate. */
int ptt_lpt_bit; /* Bit number for parallel printer port. */
/* Bit 0 = pin 2, ..., bit 7 = pin 9. */
int ptt_invert; /* Invert the output. */
int ptt_invert2; /* Invert the secondary output. */
#ifdef USE_HAMLIB
int ptt_model; /* HAMLIB model. -1 for AUTO. 2 for rigctld. Others are radio model. */
#endif
} octrl[NUM_OCTYPES];
/* Each channel can also have associated input lines. */
/* So far, we just have one for transmit inhibit. */
#define ICTYPE_TXINH 0
#define NUM_ICTYPES 1 /* number of values above. i.e. last value +1. */
struct {
ptt_method_t method; /* none, serial port, GPIO, LPT. */
int in_gpio_num; /* GPIO number */
char in_gpio_name[MAX_GPIO_NAME_LEN];
/* orginally, gpio number NN was assumed to simply */
/* have the name gpioNN but this turned out not to be */
/* the case for CubieBoard where it was longer. */
/* This is filled in by ptt_init so we don't have to */
/* recalculate it each time we access it. */
int invert; /* 1 = active low */
} ictrl[NUM_ICTYPES];
/* Transmit timing. */
int dwait; /* First wait extra time for receiver squelch. */
/* Default 0 units of 10 mS each . */
int slottime; /* Slot time in 10 mS units for persistance algorithm. */
/* Typical value is 10 meaning 100 milliseconds. */
int persist; /* 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; /* After turning on the transmitter, */
/* send "flags" for txdelay * 10 mS. */
/* Default value is 30 meaning 300 milliseconds. */
int txtail; /* 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 (= 100 mS) as the default */
/* because we're not quite sure when the soundcard audio stops. */
int fulldup; /* Full Duplex. */
} achan[MAX_CHANS];
#ifdef USE_HAMLIB
int rigs; /* Total number of configured rigs */
RIG *rig[MAX_RIGS]; /* HAMLib rig instances */
#endif
};
#if __WIN32__ || __APPLE__
#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 /* Originally 44100. Later increased because */
/* Software Defined Radio often uses 48000. */
#define MAX_SAMPLES_PER_SEC 192000 /* The cheap USB-audio adapters (e.g. CM108) can handle 44100 and 48000. */
/* The "soundcard" in my desktop PC can do 96kHz or even 192kHz. */
/* We will probably need to increase the sample rate to go much above 9600 baud. */
#define DEFAULT_BITS_PER_SAMPLE 16
#define DEFAULT_FIX_BITS RETRY_INVERT_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
/* Used for sanity checking in config file and command line options. */
/* 9600 baud is known to work. */
/* TODO: Is 19200 possible with a soundcard at 44100 samples/sec or do we need a higher sample rate? */
#define MIN_BAUD 100
//#define MAX_BAUD 10000
#define MAX_BAUD 40000 // Anyone want to try 38.4 k baud?
/*
* Typical transmit timings for VHF.
*/
#define DEFAULT_DWAIT 0
#define DEFAULT_SLOTTIME 10
#define DEFAULT_PERSIST 63
#define DEFAULT_TXDELAY 30
#define DEFAULT_TXTAIL 10
#define DEFAULT_FULLDUP 0
/*
* 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 (int a); /* a = audio device, 0 for first */
int audio_put (int a, int c);
int audio_flush (int a);
void audio_wait (int a);
int audio_close (void);
#endif /* ifdef AUDIO_H */
/* end audio.h */
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