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_GetErrorText);
  39 MAKE_FUNC(Pa_StartStream);
  40 MAKE_FUNC(Pa_StopStream);
  41 MAKE_FUNC(Pa_OpenStream);
  42 MAKE_FUNC(Pa_CloseStream);
  43 MAKE_FUNC(Pa_GetDefaultOutputDevice);
  44 #undef MAKE_FUNC
  45
  46
  47 static char *pa_device;
  48
  49 typedef struct {
  50     PaStream *stream;
  51 } pa_data;
  52
  53
  54 static int pa_callback(const void *inputBuffer, void *outputBuffer,
  55                        unsigned long framesPerBuffer, const PaStreamCallbackTimeInfo *timeInfo,
  56                        const PaStreamCallbackFlags statusFlags, void *userData)
  57 {
  58     ALCdevice *device = (ALCdevice*)userData;
  59     int frameSize;
  60
  61     (void)inputBuffer;
  62     (void)timeInfo;
  63     (void)statusFlags;
  64
  65     frameSize  = aluBytesFromFormat(device->Format);
  66     frameSize *= aluChannelsFromFormat(device->Format);
  67
  68     SuspendContext(NULL);
  69     aluMixData(device->Context, outputBuffer, framesPerBuffer*frameSize, device->Format);
  70     ProcessContext(NULL);
  71
  72     return 0;
  73 }
  74
  75
  76 static ALCboolean pa_open_playback(ALCdevice *device, const ALCchar *deviceName)
  77 {
  78     PaStreamParameters outParams;
  79     pa_data *data;
  80     int periods;
  81     PaError err;
  82
  83     if(pa_handle == NULL)
  84         return ALC_FALSE;
  85
  86     if(deviceName)
  87     {
  88         if(strcmp(deviceName, pa_device) != 0)
  89             return ALC_FALSE;
  90     }
  91
  92     device->szDeviceName = pa_device;
  93
  94     data = (pa_data*)calloc(1, sizeof(pa_data));
  95     device->ExtraData = data;
  96
  97     outParams.device = GetConfigValueInt("port", "device", -1);
  98     if(outParams.device < 0)
  99         outParams.device = pPa_GetDefaultOutputDevice();
 100     outParams.suggestedLatency = (float)device->UpdateSize /
 101                                  (float)device->Frequency;
 102     outParams.hostApiSpecificStreamInfo = NULL;
 103
 104     switch(aluBytesFromFormat(device->Format))
 105     {
 106         case 1:
 107             outParams.sampleFormat = paUInt8;
 108             break;
 109         case 2:
 110             outParams.sampleFormat = paInt16;
 111             break;
 112         default:
 113             outParams.sampleFormat = -1;
 114             AL_PRINT("Unknown format?! %x\n", device->Format);
 115     }
 116
 117     periods = GetConfigValueInt("port", "periods", 4);
 118     if((int)periods <= 0)
 119         periods = 4;
 120     outParams.channelCount = aluChannelsFromFormat(device->Format);
 121
 122     err = pPa_OpenStream(&data->stream, NULL, &outParams, device->Frequency,
 123                         device->UpdateSize/periods, paNoFlag,
 124                         pa_callback, device);
 125     if(err != paNoError)
 126     {
 127         AL_PRINT("Pa_OpenStream() returned an error: %s\n", pPa_GetErrorText(err));
 128         device->ExtraData = NULL;
 129         free(data);
 130         return ALC_FALSE;
 131     }
 132
 133     err = pPa_StartStream(data->stream);
 134     if(err != paNoError)
 135     {
 136         AL_PRINT("Pa_StartStream() returned an error: %s\n", pPa_GetErrorText(err));
 137         pPa_CloseStream(data->stream);
 138         device->ExtraData = NULL;
 139         free(data);
 140         return ALC_FALSE;
 141     }
 142
 143     device->UpdateSize /= periods;
 144     return ALC_TRUE;
 145 }
 146
 147 static void pa_close_playback(ALCdevice *device)
 148 {
 149     pa_data *data = (pa_data*)device->ExtraData;
 150     PaError err;
 151
 152     err = pPa_StopStream(data->stream);
 153     if(err != paNoError)
 154       fprintf(stderr, "Error stopping stream: %s\n", pPa_GetErrorText(err));
 155
 156     err = pPa_CloseStream(data->stream);
 157     if(err != paNoError)
 158         fprintf(stderr, "Error closing stream: %s\n", pPa_GetErrorText(err));
 159
 160     free(data);
 161     device->ExtraData = NULL;
 162 }
 163
 164
 165 static ALCboolean pa_open_capture(ALCdevice *device, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 166 {
 167     return ALC_FALSE;
 168     (void)device;
 169     (void)deviceName;
 170     (void)frequency;
 171     (void)format;
 172     (void)SampleSize;
 173 }
 174
 175
 176
 177 static const BackendFuncs pa_funcs = {
 178     pa_open_playback,
 179     pa_close_playback,
 180     pa_open_capture,
 181     NULL,
 182     NULL,
 183     NULL,
 184     NULL,
 185     NULL
 186 };
 187
 188 void alc_pa_init(BackendFuncs *func_list)
 189 {
 190     const char *str;
 191     PaError err;
 192
 193     *func_list = pa_funcs;
 194
 195 #ifdef HAVE_DLFCN_H
 196 #if defined(__APPLE__) && defined(__MACH__)
 197 # define PALIB "libportaudio.2.dylib"
 198 #else
 199 # define PALIB "libportaudio.so.2"
 200 #endif
 201     pa_handle = dlopen(PALIB, RTLD_NOW);
 202     if(!pa_handle)
 203         return;
 204     dlerror();
 205
 206 #define LOAD_FUNC(f) do { \
 207     p##f = (typeof(f)*)dlsym(pa_handle, #f); \
 208     if((str=dlerror()) != NULL) \
 209     { \
 210         dlclose(pa_handle); \
 211         pa_handle = NULL; \
 212         AL_PRINT("Could not load %s from "PALIB": %s\n", #f, str); \
 213         return; \
 214     } \
 215 } while(0)
 216 #else
 217     str = NULL;
 218     pa_handle = (void*)0xDEADBEEF;
 219 #define LOAD_FUNC(f) p##f = f
 220 #endif
 221
 222     LOAD_FUNC(Pa_Initialize);
 223     LOAD_FUNC(Pa_GetErrorText);
 224     LOAD_FUNC(Pa_StartStream);
 225     LOAD_FUNC(Pa_StopStream);
 226     LOAD_FUNC(Pa_OpenStream);
 227     LOAD_FUNC(Pa_CloseStream);
 228     LOAD_FUNC(Pa_GetDefaultOutputDevice);
 229 #undef LOAD_FUNC
 230
 231     if((err=pPa_Initialize()) != paNoError)
 232     {
 233         AL_PRINT("Pa_Initialize() returned an error: %s\n", pPa_GetErrorText(err));
 234         return;
 235     }
 236
 237     pa_device = AppendDeviceList("PortAudio Software");
 238     AppendAllDeviceList(pa_device);
 239 }