Alc/portaudio.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include "alMain.h"
  27 #include "AL/al.h"
  28 #include "AL/alc.h"
  29 #ifdef HAVE_DLFCN_H
  30 #include <dlfcn.h>
  31 #endif
  32
  33 #include <portaudio.h>
  34
  35 static void *pa_handle;
  36 #define MAKE_FUNC(x) static typeof(x) * p##x
  37 MAKE_FUNC(Pa_Initialize);
  38 MAKE_FUNC(Pa_Terminate);
  39 MAKE_FUNC(Pa_GetErrorText);
  40 MAKE_FUNC(Pa_StartStream);
  41 MAKE_FUNC(Pa_StopStream);
  42 MAKE_FUNC(Pa_OpenStream);
  43 MAKE_FUNC(Pa_CloseStream);
  44 MAKE_FUNC(Pa_GetDefaultOutputDevice);
  45 MAKE_FUNC(Pa_GetStreamInfo);
  46 #undef MAKE_FUNC
  47
  48
  49 static const ALCchar pa_device[] = "PortAudio Software";
  50 static volatile ALuint load_count;
  51
  52
  53 void *pa_load(void)
  54 {
  55     const char *str;
  56     PaError err;
  57
  58     if(load_count == 0)
  59     {
  60 #ifdef HAVE_DLFCN_H
  61 #if defined(__APPLE__) && defined(__MACH__)
  62 # define PALIB "libportaudio.2.dylib"
  63 #else
  64 # define PALIB "libportaudio.so.2"
  65 #endif
  66         pa_handle = dlopen(PALIB, RTLD_NOW);
  67         if(!pa_handle)
  68             return NULL;
  69         dlerror();
  70
  71 #define LOAD_FUNC(f) do { \
  72     p##f = (typeof(f)*)dlsym(pa_handle, #f); \
  73     if((str=dlerror()) != NULL) \
  74     { \
  75         dlclose(pa_handle); \
  76         pa_handle = NULL; \
  77         AL_PRINT("Could not load %s from "PALIB": %s\n", #f, str); \
  78         return NULL; \
  79     } \
  80 } while(0)
  81 #else
  82         str = NULL;
  83         pa_handle = (void*)0xDEADBEEF;
  84 #define LOAD_FUNC(f) p##f = f
  85 #endif
  86
  87 LOAD_FUNC(Pa_Initialize);
  88 LOAD_FUNC(Pa_Terminate);
  89 LOAD_FUNC(Pa_GetErrorText);
  90 LOAD_FUNC(Pa_StartStream);
  91 LOAD_FUNC(Pa_StopStream);
  92 LOAD_FUNC(Pa_OpenStream);
  93 LOAD_FUNC(Pa_CloseStream);
  94 LOAD_FUNC(Pa_GetDefaultOutputDevice);
  95 LOAD_FUNC(Pa_GetStreamInfo);
  96
  97 #undef LOAD_FUNC
  98
  99         if((err=pPa_Initialize()) != paNoError)
 100         {
 101             AL_PRINT("Pa_Initialize() returned an error: %s\n", pPa_GetErrorText(err));
 102 #ifdef HAVE_DLFCN_H
 103             dlclose(pa_handle);
 104 #endif
 105             pa_handle = NULL;
 106             return NULL;
 107         }
 108     }
 109     ++load_count;
 110
 111     return pa_handle;
 112 }
 113
 114 void pa_unload(void)
 115 {
 116     if(load_count == 0 || --load_count > 0)
 117         return;
 118
 119     pPa_Terminate();
 120 #ifdef HAVE_DLFCN_H
 121     dlclose(pa_handle);
 122 #endif
 123     pa_handle = NULL;
 124 }
 125
 126
 127 typedef struct {
 128     PaStream *stream;
 129 } pa_data;
 130
 131
 132 static int pa_callback(const void *inputBuffer, void *outputBuffer,
 133                        unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo *timeInfo,
 134                        const PaStreamCallbackFlags statusFlags, void *userData)
 135 {
 136     ALCdevice *device = (ALCdevice*)userData;
 137
 138     (void)inputBuffer;
 139     (void)timeInfo;
 140     (void)statusFlags;
 141
 142     aluMixData(device, outputBuffer, framesPerBuffer);
 143     return 0;
 144 }
 145
 146
 147 static ALCboolean pa_open_playback(ALCdevice *device, const ALCchar *deviceName)
 148 {
 149     const PaStreamInfo *streamInfo;
 150     PaStreamParameters outParams;
 151     pa_data *data;
 152     PaError err;
 153
 154     if(!deviceName)
 155         deviceName = pa_device;
 156     else if(strcmp(deviceName, pa_device) != 0)
 157         return ALC_FALSE;
 158
 159     if(!pa_load())
 160         return ALC_FALSE;
 161
 162     data = (pa_data*)calloc(1, sizeof(pa_data));
 163     device->ExtraData = data;
 164
 165     outParams.device = GetConfigValueInt("port", "device", -1);
 166     if(outParams.device < 0)
 167         outParams.device = pPa_GetDefaultOutputDevice();
 168     outParams.suggestedLatency = (device->UpdateSize*device->NumUpdates) /
 169                                  (float)device->Frequency;
 170     outParams.hostApiSpecificStreamInfo = NULL;
 171
 172     switch(aluBytesFromFormat(device->Format))
 173     {
 174         case 1:
 175             outParams.sampleFormat = paUInt8;
 176             break;
 177         case 2:
 178             outParams.sampleFormat = paInt16;
 179             break;
 180         case 4:
 181             outParams.sampleFormat = paFloat32;
 182             break;
 183         default:
 184             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 185             device->ExtraData = NULL;
 186             free(data);
 187             pa_unload();
 188             return ALC_FALSE;
 189     }
 190     outParams.channelCount = aluChannelsFromFormat(device->Format);
 191
 192     SetDefaultChannelOrder(device);
 193
 194     err = pPa_OpenStream(&data->stream, NULL, &outParams, device->Frequency,
 195                          device->UpdateSize, paNoFlag, pa_callback, device);
 196     if(err != paNoError)
 197     {
 198         AL_PRINT("Pa_OpenStream() returned an error: %s\n", pPa_GetErrorText(err));
 199         device->ExtraData = NULL;
 200         free(data);
 201         pa_unload();
 202         return ALC_FALSE;
 203     }
 204     streamInfo = pPa_GetStreamInfo(data->stream);
 205
 206     device->szDeviceName = strdup(deviceName);
 207     device->Frequency = streamInfo->sampleRate;
 208
 209     return ALC_TRUE;
 210 }
 211
 212 static void pa_close_playback(ALCdevice *device)
 213 {
 214     pa_data *data = (pa_data*)device->ExtraData;
 215     PaError err;
 216
 217     err = pPa_CloseStream(data->stream);
 218     if(err != paNoError)
 219         AL_PRINT("Error closing stream: %s\n", pPa_GetErrorText(err));
 220
 221     free(data);
 222     device->ExtraData = NULL;
 223
 224     pa_unload();
 225 }
 226
 227 static ALCboolean pa_reset_playback(ALCdevice *device)
 228 {
 229     pa_data *data = (pa_data*)device->ExtraData;
 230     const PaStreamInfo *streamInfo;
 231     PaError err;
 232
 233     streamInfo = pPa_GetStreamInfo(data->stream);
 234     device->Frequency = streamInfo->sampleRate;
 235
 236     err = pPa_StartStream(data->stream);
 237     if(err != paNoError)
 238     {
 239         AL_PRINT("Pa_StartStream() returned an error: %s\n", pPa_GetErrorText(err));
 240         return ALC_FALSE;
 241     }
 242
 243     return ALC_TRUE;
 244 }
 245
 246 static void pa_stop_playback(ALCdevice *device)
 247 {
 248     pa_data *data = (pa_data*)device->ExtraData;
 249     PaError err;
 250
 251     err = pPa_StopStream(data->stream);
 252     if(err != paNoError)
 253         AL_PRINT("Error stopping stream: %s\n", pPa_GetErrorText(err));
 254 }
 255
 256
 257 static ALCboolean pa_open_capture(ALCdevice *device, const ALCchar *deviceName)
 258 {
 259     return ALC_FALSE;
 260     (void)device;
 261     (void)deviceName;
 262 }
 263
 264
 265
 266 static const BackendFuncs pa_funcs = {
 267     pa_open_playback,
 268     pa_close_playback,
 269     pa_reset_playback,
 270     pa_stop_playback,
 271     pa_open_capture,
 272     NULL,
 273     NULL,
 274     NULL,
 275     NULL,
 276     NULL
 277 };
 278
 279 void alc_pa_init(BackendFuncs *func_list)
 280 {
 281     *func_list = pa_funcs;
 282 }
 283
 284 void alc_pa_deinit(void)
 285 {
 286 }
 287
 288 void alc_pa_probe(int type)
 289 {
 290     if(!pa_load()) return;
 291
 292     if(type == DEVICE_PROBE)
 293         AppendDeviceList(pa_device);
 294     else if(type == ALL_DEVICE_PROBE)
 295         AppendAllDeviceList(pa_device);
 296
 297     pa_unload();
 298 }