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->BufferSize /
 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         case 4:
 113             outParams.sampleFormat = paFloat32;
 114             break;
 115         default:
 116             outParams.sampleFormat = -1;
 117             AL_PRINT("Unknown format?! %x\n", device->Format);
 118     }
 119
 120     periods = GetConfigValueInt("port", "periods", 4);
 121     if((int)periods <= 0)
 122         periods = 4;
 123     outParams.channelCount = aluChannelsFromFormat(device->Format);
 124
 125     err = pPa_OpenStream(&data->stream, NULL, &outParams, device->Frequency,
 126                          device->BufferSize/periods, paNoFlag,
 127                          pa_callback, device);
 128     if(err != paNoError)
 129     {
 130         AL_PRINT("Pa_OpenStream() returned an error: %s\n", pPa_GetErrorText(err));
 131         device->ExtraData = NULL;
 132         free(data);
 133         return ALC_FALSE;
 134     }
 135
 136     err = pPa_StartStream(data->stream);
 137     if(err != paNoError)
 138     {
 139         AL_PRINT("Pa_StartStream() returned an error: %s\n", pPa_GetErrorText(err));
 140         pPa_CloseStream(data->stream);
 141         device->ExtraData = NULL;
 142         free(data);
 143         return ALC_FALSE;
 144     }
 145
 146     device->UpdateSize = device->BufferSize/periods;
 147     return ALC_TRUE;
 148 }
 149
 150 static void pa_close_playback(ALCdevice *device)
 151 {
 152     pa_data *data = (pa_data*)device->ExtraData;
 153     PaError err;
 154
 155     err = pPa_StopStream(data->stream);
 156     if(err != paNoError)
 157       fprintf(stderr, "Error stopping stream: %s\n", pPa_GetErrorText(err));
 158
 159     err = pPa_CloseStream(data->stream);
 160     if(err != paNoError)
 161         fprintf(stderr, "Error closing stream: %s\n", pPa_GetErrorText(err));
 162
 163     free(data);
 164     device->ExtraData = NULL;
 165 }
 166
 167 static ALCboolean pa_start_context(ALCdevice *device, ALCcontext *context)
 168 {
 169     device->Frequency = context->Frequency;
 170     return ALC_TRUE;
 171 }
 172
 173 static void pa_stop_context(ALCdevice *device, ALCcontext *context)
 174 {
 175     (void)device;
 176     (void)context;
 177 }
 178
 179
 180 static ALCboolean pa_open_capture(ALCdevice *device, const ALCchar *deviceName)
 181 {
 182     return ALC_FALSE;
 183     (void)device;
 184     (void)deviceName;
 185 }
 186
 187
 188
 189 static const BackendFuncs pa_funcs = {
 190     pa_open_playback,
 191     pa_close_playback,
 192     pa_start_context,
 193     pa_stop_context,
 194     pa_open_capture,
 195     NULL,
 196     NULL,
 197     NULL,
 198     NULL,
 199     NULL
 200 };
 201
 202 void alc_pa_init(BackendFuncs *func_list)
 203 {
 204     const char *str;
 205     PaError err;
 206
 207     *func_list = pa_funcs;
 208
 209 #ifdef HAVE_DLFCN_H
 210 #if defined(__APPLE__) && defined(__MACH__)
 211 # define PALIB "libportaudio.2.dylib"
 212 #else
 213 # define PALIB "libportaudio.so.2"
 214 #endif
 215     pa_handle = dlopen(PALIB, RTLD_NOW);
 216     if(!pa_handle)
 217         return;
 218     dlerror();
 219
 220 #define LOAD_FUNC(f) do { \
 221     p##f = (typeof(f)*)dlsym(pa_handle, #f); \
 222     if((str=dlerror()) != NULL) \
 223     { \
 224         dlclose(pa_handle); \
 225         pa_handle = NULL; \
 226         AL_PRINT("Could not load %s from "PALIB": %s\n", #f, str); \
 227         return; \
 228     } \
 229 } while(0)
 230 #else
 231     str = NULL;
 232     pa_handle = (void*)0xDEADBEEF;
 233 #define LOAD_FUNC(f) p##f = f
 234 #endif
 235
 236     LOAD_FUNC(Pa_Initialize);
 237     LOAD_FUNC(Pa_GetErrorText);
 238     LOAD_FUNC(Pa_StartStream);
 239     LOAD_FUNC(Pa_StopStream);
 240     LOAD_FUNC(Pa_OpenStream);
 241     LOAD_FUNC(Pa_CloseStream);
 242     LOAD_FUNC(Pa_GetDefaultOutputDevice);
 243 #undef LOAD_FUNC
 244
 245     if((err=pPa_Initialize()) != paNoError)
 246     {
 247         AL_PRINT("Pa_Initialize() returned an error: %s\n", pPa_GetErrorText(err));
 248         return;
 249     }
 250
 251     pa_device = AppendDeviceList("PortAudio Software");
 252     AppendAllDeviceList(pa_device);
 253 }
 254
 255 void alc_pa_deinit(void)
 256 {
 257 }