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/**
* OpenAL cross platform audio library
* Copyright (C) 1999-2007 by authors.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "alMain.h"
#include "AL/al.h"
#include "AL/alc.h"
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#include <portaudio.h>
static void *pa_handle;
#define MAKE_FUNC(x) static typeof(x) * p##x
MAKE_FUNC(Pa_Initialize);
MAKE_FUNC(Pa_GetErrorText);
MAKE_FUNC(Pa_StartStream);
MAKE_FUNC(Pa_StopStream);
MAKE_FUNC(Pa_OpenStream);
MAKE_FUNC(Pa_CloseStream);
MAKE_FUNC(Pa_GetDefaultOutputDevice);
#undef MAKE_FUNC
static char *pa_device;
typedef struct {
PaStream *stream;
} pa_data;
static int pa_callback(const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo *timeInfo,
const PaStreamCallbackFlags statusFlags, void *userData)
{
ALCdevice *device = (ALCdevice*)userData;
int frameSize;
(void)inputBuffer;
(void)timeInfo;
(void)statusFlags;
frameSize = aluBytesFromFormat(device->Format);
frameSize *= aluChannelsFromFormat(device->Format);
SuspendContext(NULL);
aluMixData(device->Context, outputBuffer, framesPerBuffer*frameSize, device->Format);
ProcessContext(NULL);
return 0;
}
static ALCboolean pa_open_playback(ALCdevice *device, const ALCchar *deviceName)
{
PaStreamParameters outParams;
pa_data *data;
int periods;
PaError err;
if(pa_handle == NULL)
return ALC_FALSE;
if(deviceName)
{
if(strcmp(deviceName, pa_device) != 0)
return ALC_FALSE;
}
device->szDeviceName = pa_device;
data = (pa_data*)calloc(1, sizeof(pa_data));
device->ExtraData = data;
outParams.device = GetConfigValueInt("port", "device", -1);
if(outParams.device < 0)
outParams.device = pPa_GetDefaultOutputDevice();
outParams.suggestedLatency = (float)device->UpdateSize /
(float)device->Frequency;
outParams.hostApiSpecificStreamInfo = NULL;
switch(aluBytesFromFormat(device->Format))
{
case 1:
outParams.sampleFormat = paUInt8;
break;
case 2:
outParams.sampleFormat = paInt16;
break;
default:
outParams.sampleFormat = -1;
AL_PRINT("Unknown format?! %x\n", device->Format);
}
periods = GetConfigValueInt("port", "periods", 4);
if((int)periods <= 0)
periods = 4;
outParams.channelCount = aluChannelsFromFormat(device->Format);
err = pPa_OpenStream(&data->stream, NULL, &outParams, device->Frequency,
device->UpdateSize/periods, paNoFlag,
pa_callback, device);
if(err != paNoError)
{
AL_PRINT("Pa_OpenStream() returned an error: %s\n", pPa_GetErrorText(err));
device->ExtraData = NULL;
free(data);
return ALC_FALSE;
}
err = pPa_StartStream(data->stream);
if(err != paNoError)
{
AL_PRINT("Pa_StartStream() returned an error: %s\n", pPa_GetErrorText(err));
pPa_CloseStream(data->stream);
device->ExtraData = NULL;
free(data);
return ALC_FALSE;
}
device->UpdateSize /= periods;
return ALC_TRUE;
}
static void pa_close_playback(ALCdevice *device)
{
pa_data *data = (pa_data*)device->ExtraData;
PaError err;
err = pPa_StopStream(data->stream);
if(err != paNoError)
fprintf(stderr, "Error stopping stream: %s\n", pPa_GetErrorText(err));
err = pPa_CloseStream(data->stream);
if(err != paNoError)
fprintf(stderr, "Error closing stream: %s\n", pPa_GetErrorText(err));
free(data);
device->ExtraData = NULL;
}
static ALCboolean pa_open_capture(ALCdevice *device, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
{
return ALC_FALSE;
(void)device;
(void)deviceName;
(void)frequency;
(void)format;
(void)SampleSize;
}
static const BackendFuncs pa_funcs = {
pa_open_playback,
pa_close_playback,
pa_open_capture,
NULL,
NULL,
NULL,
NULL,
NULL
};
void alc_pa_init(BackendFuncs *func_list)
{
const char *str;
PaError err;
*func_list = pa_funcs;
#ifdef HAVE_DLFCN_H
#if defined(__APPLE__) && defined(__MACH__)
# define PALIB "libportaudio.2.dylib"
#else
# define PALIB "libportaudio.so.2"
#endif
pa_handle = dlopen(PALIB, RTLD_NOW);
if(!pa_handle)
return;
dlerror();
#define LOAD_FUNC(f) do { \
p##f = (typeof(f)*)dlsym(pa_handle, #f); \
if((str=dlerror()) != NULL) \
{ \
dlclose(pa_handle); \
pa_handle = NULL; \
AL_PRINT("Could not load %s from "PALIB": %s\n", #f, str); \
return; \
} \
} while(0)
#else
str = NULL;
pa_handle = (void*)0xDEADBEEF;
#define LOAD_FUNC(f) p##f = f
#endif
LOAD_FUNC(Pa_Initialize);
LOAD_FUNC(Pa_GetErrorText);
LOAD_FUNC(Pa_StartStream);
LOAD_FUNC(Pa_StopStream);
LOAD_FUNC(Pa_OpenStream);
LOAD_FUNC(Pa_CloseStream);
LOAD_FUNC(Pa_GetDefaultOutputDevice);
#undef LOAD_FUNC
if((err=pPa_Initialize()) != paNoError)
{
AL_PRINT("Pa_Initialize() returned an error: %s\n", pPa_GetErrorText(err));
return;
}
pa_device = AppendDeviceList("PortAudio Software");
AppendAllDeviceList(pa_device);
}
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