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
  51 typedef struct {
  52     PaStream *stream;
  53 } pa_data;
  54
  55
  56 static int pa_callback(const void *inputBuffer, void *outputBuffer,
  57                        unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo *timeInfo,
  58                        const PaStreamCallbackFlags statusFlags, void *userData)
  59 {
  60     ALCdevice *device = (ALCdevice*)userData;
  61
  62     (void)inputBuffer;
  63     (void)timeInfo;
  64     (void)statusFlags;
  65
  66     aluMixData(device, outputBuffer, framesPerBuffer);
  67     return 0;
  68 }
  69
  70
  71 static ALCboolean pa_open_playback(ALCdevice *device, const ALCchar *deviceName)
  72 {
  73     const PaStreamInfo *streamInfo;
  74     PaStreamParameters outParams;
  75     pa_data *data;
  76     PaError err;
  77
  78     if(pa_handle == NULL)
  79         return ALC_FALSE;
  80
  81     if(!deviceName)
  82         deviceName = pa_device;
  83     else if(strcmp(deviceName, pa_device) != 0)
  84         return ALC_FALSE;
  85
  86     data = (pa_data*)calloc(1, sizeof(pa_data));
  87     device->ExtraData = data;
  88
  89     outParams.device = GetConfigValueInt("port", "device", -1);
  90     if(outParams.device < 0)
  91         outParams.device = pPa_GetDefaultOutputDevice();
  92     outParams.suggestedLatency = (device->UpdateSize*device->NumUpdates) /
  93                                  (float)device->Frequency;
  94     outParams.hostApiSpecificStreamInfo = NULL;
  95
  96     switch(aluBytesFromFormat(device->Format))
  97     {
  98         case 1:
  99             outParams.sampleFormat = paUInt8;
 100             break;
 101         case 2:
 102             outParams.sampleFormat = paInt16;
 103             break;
 104         case 4:
 105             outParams.sampleFormat = paFloat32;
 106             break;
 107         default:
 108             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 109             device->ExtraData = NULL;
 110             free(data);
 111             return ALC_FALSE;
 112     }
 113     outParams.channelCount = aluChannelsFromFormat(device->Format);
 114
 115     err = pPa_OpenStream(&data->stream, NULL, &outParams, device->Frequency,
 116                          device->UpdateSize, paNoFlag, pa_callback, device);
 117     if(err != paNoError)
 118     {
 119         AL_PRINT("Pa_OpenStream() returned an error: %s\n", pPa_GetErrorText(err));
 120         device->ExtraData = NULL;
 121         free(data);
 122         return ALC_FALSE;
 123     }
 124     streamInfo = pPa_GetStreamInfo(data->stream);
 125
 126     err = pPa_StartStream(data->stream);
 127     if(err != paNoError)
 128     {
 129         AL_PRINT("Pa_StartStream() returned an error: %s\n", pPa_GetErrorText(err));
 130         pPa_CloseStream(data->stream);
 131         device->ExtraData = NULL;
 132         free(data);
 133         return ALC_FALSE;
 134     }
 135
 136     device->szDeviceName = strdup(deviceName);
 137     device->Frequency = streamInfo->sampleRate;
 138     return ALC_TRUE;
 139 }
 140
 141 static void pa_close_playback(ALCdevice *device)
 142 {
 143     pa_data *data = (pa_data*)device->ExtraData;
 144     PaError err;
 145
 146     err = pPa_StopStream(data->stream);
 147     if(err != paNoError)
 148         fprintf(stderr, "Error stopping stream: %s\n", pPa_GetErrorText(err));
 149
 150     err = pPa_CloseStream(data->stream);
 151     if(err != paNoError)
 152         fprintf(stderr, "Error closing stream: %s\n", pPa_GetErrorText(err));
 153
 154     free(data);
 155     device->ExtraData = NULL;
 156 }
 157
 158 static ALCboolean pa_reset_playback(ALCdevice *device)
 159 {
 160     pa_data *data = (pa_data*)device->ExtraData;
 161     const PaStreamInfo *streamInfo;
 162
 163     streamInfo = pPa_GetStreamInfo(data->stream);
 164     device->Frequency = streamInfo->sampleRate;
 165
 166     return ALC_TRUE;
 167 }
 168
 169 static void pa_stop_playback(ALCdevice *device)
 170 {
 171     (void)device;
 172 }
 173
 174
 175 static ALCboolean pa_open_capture(ALCdevice *device, const ALCchar *deviceName)
 176 {
 177     return ALC_FALSE;
 178     (void)device;
 179     (void)deviceName;
 180 }
 181
 182
 183
 184 static const BackendFuncs pa_funcs = {
 185     pa_open_playback,
 186     pa_close_playback,
 187     pa_reset_playback,
 188     pa_stop_playback,
 189     pa_open_capture,
 190     NULL,
 191     NULL,
 192     NULL,
 193     NULL,
 194     NULL
 195 };
 196
 197 void alc_pa_init(BackendFuncs *func_list)
 198 {
 199     const char *str;
 200     PaError err;
 201
 202     *func_list = pa_funcs;
 203
 204 #ifdef HAVE_DLFCN_H
 205 #if defined(__APPLE__) && defined(__MACH__)
 206 # define PALIB "libportaudio.2.dylib"
 207 #else
 208 # define PALIB "libportaudio.so.2"
 209 #endif
 210     pa_handle = dlopen(PALIB, RTLD_NOW);
 211     if(!pa_handle)
 212         return;
 213     dlerror();
 214
 215 #define LOAD_FUNC(f) do { \
 216     p##f = (typeof(f)*)dlsym(pa_handle, #f); \
 217     if((str=dlerror()) != NULL) \
 218     { \
 219         dlclose(pa_handle); \
 220         pa_handle = NULL; \
 221         AL_PRINT("Could not load %s from "PALIB": %s\n", #f, str); \
 222         return; \
 223     } \
 224 } while(0)
 225 #else
 226     str = NULL;
 227     pa_handle = (void*)0xDEADBEEF;
 228 #define LOAD_FUNC(f) p##f = f
 229 #endif
 230
 231     LOAD_FUNC(Pa_Initialize);
 232     LOAD_FUNC(Pa_Terminate);
 233     LOAD_FUNC(Pa_GetErrorText);
 234     LOAD_FUNC(Pa_StartStream);
 235     LOAD_FUNC(Pa_StopStream);
 236     LOAD_FUNC(Pa_OpenStream);
 237     LOAD_FUNC(Pa_CloseStream);
 238     LOAD_FUNC(Pa_GetDefaultOutputDevice);
 239     LOAD_FUNC(Pa_GetStreamInfo);
 240 #undef LOAD_FUNC
 241
 242     if((err=pPa_Initialize()) != paNoError)
 243     {
 244         AL_PRINT("Pa_Initialize() returned an error: %s\n", pPa_GetErrorText(err));
 245         alc_pa_deinit();
 246         return;
 247     }
 248 }
 249
 250 void alc_pa_deinit(void)
 251 {
 252     if(pa_handle)
 253     {
 254         pPa_Terminate();
 255 #ifdef HAVE_DLFCN_H
 256         dlclose(pa_handle);
 257         pa_handle = NULL;
 258 #endif
 259     }
 260 }
 261
 262 void alc_pa_probe(int type)
 263 {
 264     if(!pa_handle)
 265         return;
 266
 267     if(type == DEVICE_PROBE)
 268         AppendDeviceList(pa_device);
 269     else if(type == ALL_DEVICE_PROBE)
 270         AppendAllDeviceList(pa_device);
 271 }