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Copy pathALSASound.c
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ALSASound.c
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//
// Audio interface Routine
// Passes audio samples to/from the sound interface
// As this is platform specific it also has the main() routine, which does
// platform specific initialisation before calling ardopmain()
// This is ALSASound.c for Linux
// Windows Version is Waveout.c
// Nucleo Version is NucleoSound.c
#include <alsa/asoundlib.h>
#include <signal.h>
#include <termios.h>
#include <sys/ioctl.h>
#include "ARDOPC.h"
#define SHARECAPTURE // if defined capture device is opened and closed for each transission
#define HANDLE int
void gpioSetMode(unsigned gpio, unsigned mode);
void gpioWrite(unsigned gpio, unsigned level);
int WriteLog(char * msg, int Log);
int _memicmp(unsigned char *a, unsigned char *b, int n);
int stricmp(const unsigned char * pStr1, const unsigned char *pStr2);
int gpioInitialise(void);
HANDLE OpenCOMPort(VOID * pPort, int speed, BOOL SetDTR, BOOL SetRTS, BOOL Quiet, int Stopbits);
VOID COMSetDTR(HANDLE fd);
VOID COMClearDTR(HANDLE fd);
VOID COMSetRTS(HANDLE fd);
VOID COMClearRTS(HANDLE fd);
VOID RadioPTT(int PTTState);
VOID SerialHostPoll();
VOID TCPHostPoll();
int CloseSoundCard();
int PackSamplesAndSend(short * input, int nSamples);
void displayLevel(int max);
BOOL WriteCOMBlock(HANDLE fd, char * Block, int BytesToWrite);
VOID processargs(int argc, char * argv[]);
int initdisplay();
extern BOOL blnDISCRepeating;
extern BOOL UseKISS; // Enable Packet (KISS) interface
BOOL UseLeft = TRUE;
BOOL UseRight = TRUE;
char LogDir[256] = "";
void Sleep(int mS)
{
usleep(mS * 1000);
return;
}
// Windows and ALSA work with signed samples +- 32767
// STM32 and Teensy DAC uses unsigned 0 - 4095
short buffer[2][1200]; // Two Transfer/DMA buffers of 0.1 Sec
short inbuffer[2][1200]; // Two Transfer/DMA buffers of 0.1 Sec
BOOL Loopback = FALSE;
//BOOL Loopback = TRUE;
char CaptureDevice[80] = "ARDOP";
char PlaybackDevice[80] = "ARDOP";
char * CaptureDevices = CaptureDevice;
char * PlaybackDevices = CaptureDevice;
void InitSound();
int Ticks;
int LastNow;
extern int Number; // Number waiting to be sent
snd_pcm_sframes_t MaxAvail;
#include <stdarg.h>
FILE *logfile[3] = {NULL, NULL, NULL};
char LogName[3][256] = {"ARDOPDebug", "ARDOPException", "ARDOPSession"};
#define DEBUGLOG 0
#define EXCEPTLOG 1
#define SESSIONLOG 2
FILE *statslogfile = NULL;
VOID CloseDebugLog()
{
if (logfile[DEBUGLOG])
fclose(logfile[DEBUGLOG]);
logfile[DEBUGLOG] = NULL;
}
VOID CloseStatsLog()
{
if (statslogfile)
fclose(statslogfile);
statslogfile = NULL;
}
VOID Debugprintf(const char * format, ...)
{
char Mess[10000];
va_list(arglist);
va_start(arglist, format);
vsnprintf(Mess, sizeof(Mess), format, arglist);
strcat(Mess, "\r\n");
printf("%s", Mess);
WriteLog(Mess, DEBUGLOG);
return;
}
VOID WriteDebugLog(int Level, const char * format, ...)
{
char Mess[10000];
va_list(arglist);
va_start(arglist, format);
vsnprintf(Mess, sizeof(Mess), format, arglist);
strcat(Mess, "\n");
if (Level <= ConsoleLogLevel)
printf("%s", Mess);
if (!DebugLog)
return;
WriteLog(Mess, DEBUGLOG);
return;
}
VOID WriteExceptionLog(const char * format, ...)
{
char Mess[10000];
va_list(arglist);
va_start(arglist, format);
vsnprintf(Mess, sizeof(Mess), format, arglist);
strcat(Mess, "\n");
printf("%s", Mess);
WriteLog(Mess, EXCEPTLOG);
fclose(logfile[EXCEPTLOG]);
logfile[EXCEPTLOG] = NULL;
return;
}
VOID Statsprintf(const char * format, ...)
{
char Mess[10000];
va_list(arglist);
UCHAR Value[100];
char timebuf[32];
struct timespec tp;
int hh;
int mm;
int ss;
clock_gettime(CLOCK_REALTIME, &tp);
va_start(arglist, format);
vsnprintf(Mess, sizeof(Mess), format, arglist);
strcat(Mess, "\n");
ss = tp.tv_sec % 86400; // Secs int day
hh = ss / 3600;
mm = (ss - (hh * 3600)) / 60;
ss = ss % 60;
sprintf(timebuf, "%02d:%02d:%02d.%03d ",
hh, mm, ss, (int)tp.tv_nsec/1000000);
if (statslogfile == NULL)
{
struct tm * tm;
time_t T;
T = time(NULL);
tm = gmtime(&T);
sprintf(Value, "%s%d_%04d%02d%02d.log",
LogName[2], port, tm->tm_year +1900, tm->tm_mon+1, tm->tm_mday);
if ((statslogfile = fopen(Value, "ab")) == NULL)
{
perror(Value);
return;
}
else
{
fputs(timebuf, statslogfile);
fputs("\n", statslogfile);
}
}
fputs(Mess, statslogfile);
printf("%s", Mess);
return;
}
void printtick(char * msg)
{
Debugprintf("%s %i", msg, Now - LastNow);
LastNow = Now;
}
struct timespec time_start;
unsigned int getTicks()
{
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC, &tp);
return (tp.tv_sec - time_start.tv_sec) * 1000 + (tp.tv_nsec - time_start.tv_nsec) / 1000000;
}
void PlatformSleep()
{
Sleep(1);
if (PKTLEDTimer && Now > PKTLEDTimer)
{
PKTLEDTimer = 0;
SetLED(PKTLED, 0); // turn off packet rxed led
}
}
// PTT via GPIO code
#ifdef __ARM_ARCH
#define PI_INPUT 0
#define PI_OUTPUT 1
#define PI_ALT0 4
#define PI_ALT1 5
#define PI_ALT2 6
#define PI_ALT3 7
#define PI_ALT4 3
#define PI_ALT5 2
// Set GPIO pin as output and set low
extern int pttGPIOPin;
extern BOOL pttGPIOInvert;
void SetupGPIOPTT()
{
if (pttGPIOPin == -1)
{
WriteDebugLog(LOGALERT, "GPIO PTT disabled");
RadioControl = FALSE;
useGPIO = FALSE;
}
else
{
if (pttGPIOPin < 0) {
pttGPIOInvert = TRUE;
pttGPIOPin = -pttGPIOPin;
}
gpioSetMode(pttGPIOPin, PI_OUTPUT);
gpioWrite(pttGPIOPin, pttGPIOInvert ? 1 : 0);
WriteDebugLog(LOGALERT, "Using GPIO pin %d for PTT", pttGPIOPin);
RadioControl = TRUE;
useGPIO = TRUE;
}
}
#endif
static void sigterm_handler(int sig)
{
printf("terminating on SIGTERM\n");
blnClosing = TRUE;
}
static void sigint_handler(int sig)
{
printf("terminating on SIGINT\n");
blnClosing = TRUE;
}
char * PortString = NULL;
void main(int argc, char * argv[])
{
struct timespec tp;
struct sigaction act;
// Sleep(1000); // Give LinBPQ time to complete init if exec'ed by linbpq
processargs(argc, argv);
if (LogDir[0])
{
sprintf(&LogName[0][0], "%s/%s", LogDir, "ARDOPDebug");
sprintf(&LogName[1][0], "%s/%s", LogDir, "ARDOPException");
sprintf(&LogName[2][0], "%s/%s", LogDir, "ARDOPSession");
}
setlinebuf(stdout); // So we can redirect output to file and tail
Debugprintf("ARDOPC Version %s", ProductVersion);
if (HostPort[0])
{
char *pkt = strlop(HostPort, '/');
if (_memicmp(HostPort, "COM", 3) == 0)
{
SerialMode = 1;
}
else
port = atoi(HostPort);
if (pkt)
pktport = atoi(pkt);
}
if (CATPort[0])
{
char * Baud = strlop(CATPort, ':');
if (Baud)
CATBAUD = atoi(Baud);
hCATDevice = OpenCOMPort(CATPort, CATBAUD, FALSE, FALSE, FALSE, 0);
}
if (PTTPort[0])
{
char * Baud = strlop(PTTPort, ':');
char * pin = strlop(PTTPort, '=');
if (Baud)
PTTBAUD = atoi(Baud);
if (strcmp(CATPort, PTTPort) == 0)
{
hPTTDevice = hCATDevice;
}
else
{
if (stricmp(PTTPort, "GPIO") == 0)
{
// Initialise GPIO for PTT if available
#ifdef __ARM_ARCH
if (gpioInitialise() == 0)
{
printf("GPIO interface for PTT available\n");
gotGPIO = TRUE;
if (pin)
pttGPIOPin = atoi(pin);
else
pttGPIOPin = 17;
SetupGPIOPTT();
}
else
printf("Couldn't initialise GPIO interface for PTT\n");
#else
printf("GPIO interface for PTT not available on this platform\n");
#endif
}
else // Not GPIO
{
hPTTDevice = OpenCOMPort(PTTPort, PTTBAUD, FALSE, FALSE, FALSE, 0);
}
}
}
if (hCATDevice)
{
WriteDebugLog(LOGALERT, "CAT Control on port %s", CATPort);
COMSetRTS(hPTTDevice);
COMSetDTR(hPTTDevice);
if (PTTOffCmdLen)
{
WriteDebugLog(LOGALERT, "PTT using CAT Port", CATPort);
RadioControl = TRUE;
}
}
else
{
// Warn of -u and -k defined but no CAT Port
if (PTTOffCmdLen)
{
WriteDebugLog(LOGALERT, "Warning PTT Off string defined but no CAT port", CATPort);
}
}
if (hPTTDevice)
{
WriteDebugLog(LOGALERT, "Using RTS on port %s for PTT", PTTPort);
COMClearRTS(hPTTDevice);
COMClearDTR(hPTTDevice);
RadioControl = TRUE;
}
initdisplay();
if (SerialMode)
Debugprintf("ARDOPC Using a pseudotty symlinked to %s", HostPort);
else
Debugprintf("ARDOPC listening on port %d", port);
if (UseKISS && pktport)
Debugprintf("ARDOPC listening for KISS frames on port %d", pktport);
// Get Time Reference
clock_gettime(CLOCK_MONOTONIC, &time_start);
LastNow = getTicks();
// Trap signals
memset (&act, '\0', sizeof(act));
act.sa_handler = &sigint_handler;
if (sigaction(SIGINT, &act, NULL) < 0)
perror ("SIGINT");
act.sa_handler = &sigterm_handler;
if (sigaction(SIGTERM, &act, NULL) < 0)
perror ("SIGTERM");
act.sa_handler = SIG_IGN;
if (sigaction(SIGHUP, &act, NULL) < 0)
perror ("SIGHUP");
if (sigaction(SIGPIPE, &act, NULL) < 0)
perror ("SIGPIPE");
ardopmain();
// if PTY used, remove it
if (SerialMode)
unlink (HostPort);
}
void txSleep(int mS)
{
// called while waiting for next TX buffer or to delay response.
// Run background processes
if (SerialMode)
SerialHostPoll();
else
TCPHostPoll();
Sleep(mS);
if (PKTLEDTimer && Now > PKTLEDTimer)
{
PKTLEDTimer = 0;
SetLED(PKTLED, 0); // turn off packet rxed led
}
}
// ALSA Code
#define true 1
#define false 0
snd_pcm_t * playhandle = NULL;
snd_pcm_t * rechandle = NULL;
int m_playchannels = 1;
int m_recchannels = 1;
char SavedCaptureDevice[256]; // Saved so we can reopen
char SavedPlaybackDevice[256];
int Savedplaychannels = 1;
int SavedCaptureRate;
int SavedPlaybackRate;
// This rather convoluted process simplifies marshalling from Managed Code
char ** WriteDevices = NULL;
int WriteDeviceCount = 0;
char ** ReadDevices = NULL;
int ReadDeviceCount = 0;
// Routine to check that library is available
int CheckifLoaded()
{
// Prevent CTRL/C from closing the TNC
// (This causes problems if the TNC is started by LinBPQ)
signal(SIGHUP, SIG_IGN);
signal(SIGINT, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
return TRUE;
}
int GetOutputDeviceCollection()
{
// Get all the suitable devices and put in a list for GetNext to return
snd_ctl_t *handle= NULL;
snd_pcm_t *pcm= NULL;
snd_ctl_card_info_t *info;
snd_pcm_info_t *pcminfo;
snd_pcm_hw_params_t *pars;
snd_pcm_format_mask_t *fmask;
char NameString[256];
Debugprintf("Playback Devices\n");
CloseSoundCard();
// free old struct if called again
// while (WriteDeviceCount)
// {
// WriteDeviceCount--;
// free(WriteDevices[WriteDeviceCount]);
// }
// if (WriteDevices)
// free(WriteDevices);
WriteDevices = NULL;
WriteDeviceCount = 0;
// Add virtual device ARDOP so ALSA plugins can be used if needed
WriteDevices = realloc(WriteDevices,(WriteDeviceCount + 1) * sizeof(WriteDevices));
WriteDevices[WriteDeviceCount++] = strdup("ARDOP");
// Get Device List from ALSA
snd_ctl_card_info_alloca(&info);
snd_pcm_info_alloca(&pcminfo);
snd_pcm_hw_params_alloca(&pars);
snd_pcm_format_mask_alloca(&fmask);
char hwdev[80];
unsigned min, max, ratemin, ratemax;
int card, err, dev, nsubd;
snd_pcm_stream_t stream = SND_PCM_STREAM_PLAYBACK;
card = -1;
if (snd_card_next(&card) < 0)
{
Debugprintf("No Devices");
return 0;
}
if (playhandle)
snd_pcm_close(playhandle);
playhandle = NULL;
while (card >= 0)
{
sprintf(hwdev, "hw:%d", card);
err = snd_ctl_open(&handle, hwdev, 0);
err = snd_ctl_card_info(handle, info);
Debugprintf("Card %d, ID `%s', name `%s'", card, snd_ctl_card_info_get_id(info),
snd_ctl_card_info_get_name(info));
dev = -1;
if(snd_ctl_pcm_next_device(handle, &dev) < 0)
{
// Card has no devices
snd_ctl_close(handle);
goto nextcard;
}
while (dev >= 0)
{
snd_pcm_info_set_device(pcminfo, dev);
snd_pcm_info_set_subdevice(pcminfo, 0);
snd_pcm_info_set_stream(pcminfo, stream);
err = snd_ctl_pcm_info(handle, pcminfo);
if (err == -ENOENT)
goto nextdevice;
nsubd = snd_pcm_info_get_subdevices_count(pcminfo);
Debugprintf(" Device hw:%d,%d ID `%s', name `%s', %d subdevices (%d available)",
card, dev, snd_pcm_info_get_id(pcminfo), snd_pcm_info_get_name(pcminfo),
nsubd, snd_pcm_info_get_subdevices_avail(pcminfo));
sprintf(hwdev, "hw:%d,%d", card, dev);
err = snd_pcm_open(&pcm, hwdev, stream, SND_PCM_NONBLOCK);
if (err)
{
Debugprintf("Error %d opening output device", err);
goto nextdevice;
}
// Get parameters for this device
err = snd_pcm_hw_params_any(pcm, pars);
snd_pcm_hw_params_get_channels_min(pars, &min);
snd_pcm_hw_params_get_channels_max(pars, &max);
snd_pcm_hw_params_get_rate_min(pars, &ratemin, NULL);
snd_pcm_hw_params_get_rate_max(pars, &ratemax, NULL);
if( min == max )
if( min == 1 )
Debugprintf(" 1 channel, sampling rate %u..%u Hz", ratemin, ratemax);
else
Debugprintf(" %d channels, sampling rate %u..%u Hz", min, ratemin, ratemax);
else
Debugprintf(" %u..%u channels, sampling rate %u..%u Hz", min, max, ratemin, ratemax);
// Add device to list
sprintf(NameString, "hw:%d,%d %s(%s)", card, dev,
snd_pcm_info_get_name(pcminfo), snd_ctl_card_info_get_name(info));
WriteDevices = realloc(WriteDevices,(WriteDeviceCount + 1) * sizeof(WriteDevices));
WriteDevices[WriteDeviceCount++] = strdup(NameString);
snd_pcm_close(pcm);
pcm= NULL;
nextdevice:
if (snd_ctl_pcm_next_device(handle, &dev) < 0)
break;
}
snd_ctl_close(handle);
nextcard:
Debugprintf("");
if (snd_card_next(&card) < 0) // No more cards
break;
}
return WriteDeviceCount;
}
int GetNextOutputDevice(char * dest, int max, int n)
{
if (n >= WriteDeviceCount)
return 0;
strcpy(dest, WriteDevices[n]);
return strlen(dest);
}
int GetInputDeviceCollection()
{
// Get all the suitable devices and put in a list for GetNext to return
snd_ctl_t *handle= NULL;
snd_pcm_t *pcm= NULL;
snd_ctl_card_info_t *info;
snd_pcm_info_t *pcminfo;
snd_pcm_hw_params_t *pars;
snd_pcm_format_mask_t *fmask;
char NameString[256];
Debugprintf("Capture Devices\n");
ReadDevices = NULL;
ReadDeviceCount = 0;
// Add virtual device ARDOP so ALSA plugins can be used if needed
ReadDevices = realloc(ReadDevices,(ReadDeviceCount + 1) * sizeof(ReadDevices));
ReadDevices[ReadDeviceCount++] = strdup("ARDOP");
// Get Device List from ALSA
snd_ctl_card_info_alloca(&info);
snd_pcm_info_alloca(&pcminfo);
snd_pcm_hw_params_alloca(&pars);
snd_pcm_format_mask_alloca(&fmask);
char hwdev[80];
unsigned min, max, ratemin, ratemax;
int card, err, dev, nsubd;
snd_pcm_stream_t stream = SND_PCM_STREAM_CAPTURE;
card = -1;
if(snd_card_next(&card) < 0)
{
Debugprintf("No Devices");
return 0;
}
if (rechandle)
snd_pcm_close(rechandle);
rechandle = NULL;
while(card >= 0)
{
sprintf(hwdev, "hw:%d", card);
err = snd_ctl_open(&handle, hwdev, 0);
err = snd_ctl_card_info(handle, info);
Debugprintf("Card %d, ID `%s', name `%s'", card, snd_ctl_card_info_get_id(info),
snd_ctl_card_info_get_name(info));
dev = -1;
if (snd_ctl_pcm_next_device(handle, &dev) < 0) // No Devicdes
{
snd_ctl_close(handle);
goto nextcard;
}
while(dev >= 0)
{
snd_pcm_info_set_device(pcminfo, dev);
snd_pcm_info_set_subdevice(pcminfo, 0);
snd_pcm_info_set_stream(pcminfo, stream);
err= snd_ctl_pcm_info(handle, pcminfo);
if (err == -ENOENT)
goto nextdevice;
nsubd= snd_pcm_info_get_subdevices_count(pcminfo);
Debugprintf(" Device hw:%d,%d ID `%s', name `%s', %d subdevices (%d available)",
card, dev, snd_pcm_info_get_id(pcminfo), snd_pcm_info_get_name(pcminfo),
nsubd, snd_pcm_info_get_subdevices_avail(pcminfo));
sprintf(hwdev, "hw:%d,%d", card, dev);
err = snd_pcm_open(&pcm, hwdev, stream, SND_PCM_NONBLOCK);
if (err)
{
Debugprintf("Error %d opening input device", err);
goto nextdevice;
}
err = snd_pcm_hw_params_any(pcm, pars);
snd_pcm_hw_params_get_channels_min(pars, &min);
snd_pcm_hw_params_get_channels_max(pars, &max);
snd_pcm_hw_params_get_rate_min(pars, &ratemin, NULL);
snd_pcm_hw_params_get_rate_max(pars, &ratemax, NULL);
if( min == max )
if( min == 1 )
Debugprintf(" 1 channel, sampling rate %u..%u Hz", ratemin, ratemax);
else
Debugprintf(" %d channels, sampling rate %u..%u Hz", min, ratemin, ratemax);
else
Debugprintf(" %u..%u channels, sampling rate %u..%u Hz", min, max, ratemin, ratemax);
sprintf(NameString, "hw:%d,%d %s(%s)", card, dev,
snd_pcm_info_get_name(pcminfo), snd_ctl_card_info_get_name(info));
// Debugprintf("%s", NameString);
ReadDevices = realloc(ReadDevices,(ReadDeviceCount + 1) * sizeof(ReadDevices));
ReadDevices[ReadDeviceCount++] = strdup(NameString);
snd_pcm_close(pcm);
pcm= NULL;
nextdevice:
if (snd_ctl_pcm_next_device(handle, &dev) < 0)
break;
}
snd_ctl_close(handle);
nextcard:
Debugprintf("");
if (snd_card_next(&card) < 0 )
break;
}
return ReadDeviceCount;
}
int GetNextInputDevice(char * dest, int max, int n)
{
if (n >= ReadDeviceCount)
return 0;
strcpy(dest, ReadDevices[n]);
return strlen(dest);
}
int OpenSoundPlayback(char * PlaybackDevice, int m_sampleRate, int channels, char * ErrorMsg)
{
int err = 0;
char buf1[100];
char * ptr;
if (playhandle)
{
snd_pcm_close(playhandle);
playhandle = NULL;
}
strcpy(SavedPlaybackDevice, PlaybackDevice); // Saved so we can reopen in error recovery
SavedPlaybackRate = m_sampleRate;
strcpy(buf1, PlaybackDevice);
ptr = strchr(buf1, ' ');
if (ptr) *ptr = 0; // Get Device part of name
snd_pcm_hw_params_t *hw_params;
if ((err = snd_pcm_open(&playhandle, buf1, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
if (ErrorMsg)
sprintf (ErrorMsg, "cannot open playback audio device %s (%s)", buf1, snd_strerror(err));
else
Debugprintf("cannot open playback audio device %s (%s)", buf1, snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0) {
Debugprintf("cannot allocate hardware parameter structure (%s)", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_any (playhandle, hw_params)) < 0) {
Debugprintf("cannot initialize hardware parameter structure (%s)", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_set_access (playhandle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
Debugprintf("cannot set playback access type (%s)", snd_strerror (err));
return false;
}
if ((err = snd_pcm_hw_params_set_format (playhandle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
Debugprintf("cannot setplayback sample format (%s)", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_set_rate (playhandle, hw_params, m_sampleRate, 0)) < 0) {
if (ErrorMsg)
sprintf (ErrorMsg, "cannot set playback sample rate (%s)", snd_strerror(err));
else
Debugprintf("cannot set playback sample rate (%s)", snd_strerror(err));
return false;
}
// Initial call has channels set to 1. Subequent ones set to what worked last time
if ((err = snd_pcm_hw_params_set_channels (playhandle, hw_params, channels)) < 0)
{
Debugprintf("cannot set play channel count to %d (%s)", channels, snd_strerror(err));
if (channels == 2)
return false; // Shouldn't happen as should have worked before
channels = 2;
if ((err = snd_pcm_hw_params_set_channels (playhandle, hw_params, 2)) < 0)
{
Debugprintf("cannot play set channel count to 2 (%s)", snd_strerror(err));
return false;
}
}
// Debugprintf("Play using %d channels", channels);
if ((err = snd_pcm_hw_params (playhandle, hw_params)) < 0) {
Debugprintf("cannot set parameters (%s)", snd_strerror(err));
return false;
}
snd_pcm_hw_params_free(hw_params);
if ((err = snd_pcm_prepare (playhandle)) < 0) {
Debugprintf("cannot prepare audio interface for use (%s)", snd_strerror(err));
return false;
}
Savedplaychannels = m_playchannels = channels;
MaxAvail = snd_pcm_avail_update(playhandle);
// Debugprintf("Playback Buffer Size %d", (int)MaxAvail);
return true;
}
int OpenSoundCapture(char * CaptureDevice, int m_sampleRate, char * ErrorMsg)
{
int err = 0;
char buf1[100];
char * ptr;
snd_pcm_hw_params_t *hw_params;
if (rechandle)
{
snd_pcm_close(rechandle);
rechandle = NULL;
}
strcpy(SavedCaptureDevice, CaptureDevice); // Saved so we can reopen in error recovery
SavedCaptureRate = m_sampleRate;
strcpy(buf1, CaptureDevice);
ptr = strchr(buf1, ' ');
if (ptr) *ptr = 0; // Get Device part of name
if ((err = snd_pcm_open (&rechandle, buf1, SND_PCM_STREAM_CAPTURE, 0)) < 0) {
if (ErrorMsg)
sprintf (ErrorMsg, "cannot open capture audio device %s (%s)", buf1, snd_strerror(err));
else
Debugprintf("cannot open capture audio device %s (%s)", buf1, snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0) {
Debugprintf("cannot allocate capture hardware parameter structure (%s)", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_any (rechandle, hw_params)) < 0) {
Debugprintf("cannot initialize capture hardware parameter structure (%s)", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_set_access (rechandle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
Debugprintf("cannot set capture access type (%s)", snd_strerror (err));
return false;
}
if ((err = snd_pcm_hw_params_set_format (rechandle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
Debugprintf("cannot set capture sample format (%s)", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_set_rate (rechandle, hw_params, m_sampleRate, 0)) < 0) {
if (ErrorMsg)
sprintf (ErrorMsg, "cannot set capture sample rate (%s)", snd_strerror(err));
else
Debugprintf("cannot set capture sample rate (%s)", snd_strerror(err));
return false;
}
m_recchannels = 1;
if (UseLeft == 0 || UseRight == 0)
m_recchannels = 2; // L/R implies stereo
if ((err = snd_pcm_hw_params_set_channels (rechandle, hw_params, m_recchannels)) < 0)
{
if (ErrorMsg)
sprintf (ErrorMsg, "cannot set rec channel count to %d (%s)" ,m_recchannels, snd_strerror(err));
else
Debugprintf("cannot set rec channel count to %d (%s)", m_recchannels, snd_strerror(err));