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/*
* PortAudio Portable Real-Time Audio Library
* Latest Version at: http://www.portaudio.com
* Linux OSS Implementation by douglas repetto and Phil Burk
*
* Copyright (c) 1999-2000 Phil Burk
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* Any person wishing to distribute modifications to the Software is
* requested to send the modifications to the original developer so that
* they can be incorporated into the canonical version.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
/* Modification history:
20020621: pa_unix_oss.c split into pa_unix.c, pa_unix.h, pa_unix_oss.c by
Augustus Saunders. See pa_unix.c for previous history. */
/*
PROPOSED - should we add this to "portaudio.h". Problem with
Pa_QueryDevice() not having same driver name os Pa_OpenStream().
A PaDriverInfo structure can be passed to the underlying device
on the Pa_OpenStream() call. The contents and interpretation of
the structure is determined by the PA implementation.
*/
typedef struct PaDriverInfo /* PROPOSED */
{
/* Size of structure. Allows driver to extend the structure without breaking existing applications. */
int size;
/* Can be used to request a specific device name. */
const char *name;
unsigned long data;
}
PaDriverInfo;
#include <stdio.h>
#include <stdlib.h>
//#include <malloc.h>
#include <memory.h>
#include <math.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <sched.h>
#include <pthread.h>
#include <errno.h>
#include "portaudio.h"
#include "pa_host.h"
#include "pa_trace.h"
#define PRINT(x) { printf x; fflush(stdout); }
#define ERR_RPT(x) PRINT(x)
#define DBUG(x) /* PRINT(x) */
#define DBUGX(x) /* PRINT(x) */
#define BAD_DEVICE_ID (-1)
#define MIN_LATENCY_MSEC (100)
#define MIN_TIMEOUT_MSEC (100)
#define MAX_TIMEOUT_MSEC (1000)
/************************************************* Definitions ********/
#ifdef __linux__
#define DEVICE_NAME_BASE "/dev/dsp"
#else
#define DEVICE_NAME_BASE "/dev/audio"
#endif
#define MAX_CHARS_DEVNAME (32)
#define MAX_SAMPLE_RATES (10)
typedef struct internalPortAudioDevice
{
struct internalPortAudioDevice *pad_Next; /* Singly linked list. */
double pad_SampleRates[MAX_SAMPLE_RATES]; /* for pointing to from pad_Info */
char pad_DeviceName[MAX_CHARS_DEVNAME];
PaDeviceInfo pad_Info;
}
internalPortAudioDevice;
/* Define structure to contain all OSS and Linux specific data. */
typedef struct PaHostSoundControl
{
int pahsc_OutputHandle;
int pahsc_InputHandle;
int pahsc_AudioPriority; /* priority of background audio thread */
pthread_t pahsc_AudioThread; /* background audio thread */
int pahsc_IsAudioThreadValid; /* Is pahsc_AudioThread valid?*/ pid_t pahsc_AudioThreadPID; /* background audio thread */
pthread_t pahsc_WatchDogThread; /* highest priority thread that protects system */
int pahsc_IsWatchDogThreadValid; /* Is pahsc_WatchDogThread valid?*/
int pahsc_WatchDogRun; /* Ask WatchDog to stop. */
pthread_t pahsc_CanaryThread; /* low priority thread that detects abuse by audio */
int pahsc_IsCanaryThreadValid; /* Is pahsc_CanaryThread valid?*/
struct timeval pahsc_CanaryTime;
int pahsc_CanaryRun; /* Ask Canary to stop. */
short *pahsc_NativeInputBuffer;
short *pahsc_NativeOutputBuffer;
unsigned int pahsc_BytesPerInputBuffer; /* native buffer size in bytes */
unsigned int pahsc_BytesPerOutputBuffer; /* native buffer size in bytes */
/* For measuring CPU utilization. */
struct timeval pahsc_EntryTime;
double pahsc_InverseMicrosPerBuffer; /* 1/Microseconds of real-time audio per user buffer. */
/* For calculating stream time */
int pahsc_LastPosPtr;
double pahsc_LastStreamBytes;
}
PaHostSoundControl;
/************************************************* Prototypes **********/
internalPortAudioDevice *Pa_GetInternalDevice( PaDeviceID id );
PaError Pa_QueryDevices( void );
PaError Pa_QueryDevice( const char *deviceName, internalPortAudioDevice *pad );
PaError Pa_SetupDeviceFormat( int devHandle, int numChannels, int sampleRate );
PaError Pa_SetupInputDeviceFormat( int devHandle, int numChannels, int sampleRate );
PaError Pa_SetupOutputDeviceFormat( int devHandle, int numChannels, int sampleRate );
void Pa_SetLatency( int devHandle, int numBuffers, int framesPerBuffer, int channelsPerFrame );
void Pa_UpdateStreamTime(PaHostSoundControl *pahsc);
int Pa_FlushStream(int devHandle);
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