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 const ALCchar pa_device[] = "PortAudio Software";
  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     data = (pa_data*)calloc(1, sizeof(pa_data));
  93     device->ExtraData = data;
  94
  95     outParams.device = GetConfigValueInt("port", "device", -1);
  96     if(outParams.device < 0)
  97         outParams.device = pPa_GetDefaultOutputDevice();
  98     outParams.suggestedLatency = (float)device->BufferSize /
  99                                  (float)device->Frequency;
 100     outParams.hostApiSpecificStreamInfo = NULL;
 101
 102     switch(aluBytesFromFormat(device->Format))
 103     {
 104         case 1:
 105             outParams.sampleFormat = paUInt8;
 106             break;
 107         case 2:
 108             outParams.sampleFormat = paInt16;
 109             break;
 110         case 4:
 111             outParams.sampleFormat = paFloat32;
 112             break;
 113         default:
 114             outParams.sampleFormat = -1;
 115             AL_PRINT("Unknown format?! %x\n", device->Format);
 116     }
 117
 118     periods = GetConfigValueInt("port", "periods", 4);
 119     if((int)periods <= 0)
 120         periods = 4;
 121     outParams.channelCount = aluChannelsFromFormat(device->Format);
 122
 123     err = pPa_OpenStream(&data->stream, NULL, &outParams, device->Frequency,
 124                          device->BufferSize/periods, paNoFlag,
 125                          pa_callback, device);
 126     if(err != paNoError)
 127     {
 128         AL_PRINT("Pa_OpenStream() returned an error: %s\n", pPa_GetErrorText(err));
 129         device->ExtraData = NULL;
 130         free(data);
 131         return ALC_FALSE;
 132     }
 133
 134     err = pPa_StartStream(data->stream);
 135     if(err != paNoError)
 136     {
 137         AL_PRINT("Pa_StartStream() returned an error: %s\n", pPa_GetErrorText(err));
 138         pPa_CloseStream(data->stream);
 139         device->ExtraData = NULL;
 140         free(data);
 141         return ALC_FALSE;
 142     }
 143
 144     device->szDeviceName = strdup(pa_device);
 145     device->UpdateSize = device->BufferSize/periods;
 146     return ALC_TRUE;
 147 }
 148
 149 static void pa_close_playback(ALCdevice *device)
 150 {
 151     pa_data *data = (pa_data*)device->ExtraData;
 152     PaError err;
 153
 154     err = pPa_StopStream(data->stream);
 155     if(err != paNoError)
 156       fprintf(stderr, "Error stopping stream: %s\n", pPa_GetErrorText(err));
 157
 158     err = pPa_CloseStream(data->stream);
 159     if(err != paNoError)
 160         fprintf(stderr, "Error closing stream: %s\n", pPa_GetErrorText(err));
 161
 162     free(data);
 163     device->ExtraData = NULL;
 164 }
 165
 166 static ALCboolean pa_start_context(ALCdevice *device, ALCcontext *context)
 167 {
 168     device->Frequency = context->Frequency;
 169     return ALC_TRUE;
 170 }
 171
 172 static void pa_stop_context(ALCdevice *device, ALCcontext *context)
 173 {
 174     (void)device;
 175     (void)context;
 176 }
 177
 178
 179 static ALCboolean pa_open_capture(ALCdevice *device, const ALCchar *deviceName)
 180 {
 181     return ALC_FALSE;
 182     (void)device;
 183     (void)deviceName;
 184 }
 185
 186
 187
 188 static const BackendFuncs pa_funcs = {
 189     pa_open_playback,
 190     pa_close_playback,
 191     pa_start_context,
 192     pa_stop_context,
 193     pa_open_capture,
 194     NULL,
 195     NULL,
 196     NULL,
 197     NULL,
 198     NULL
 199 };
 200
 201 void alc_pa_init(BackendFuncs *func_list)
 202 {
 203     const char *str;
 204     PaError err;
 205
 206     *func_list = pa_funcs;
 207
 208 #ifdef HAVE_DLFCN_H
 209 #if defined(__APPLE__) && defined(__MACH__)
 210 # define PALIB "libportaudio.2.dylib"
 211 #else
 212 # define PALIB "libportaudio.so.2"
 213 #endif
 214     pa_handle = dlopen(PALIB, RTLD_NOW);
 215     if(!pa_handle)
 216         return;
 217     dlerror();
 218
 219 #define LOAD_FUNC(f) do { \
 220     p##f = (typeof(f)*)dlsym(pa_handle, #f); \
 221     if((str=dlerror()) != NULL) \
 222     { \
 223         dlclose(pa_handle); \
 224         pa_handle = NULL; \
 225         AL_PRINT("Could not load %s from "PALIB": %s\n", #f, str); \
 226         return; \
 227     } \
 228 } while(0)
 229 #else
 230     str = NULL;
 231     pa_handle = (void*)0xDEADBEEF;
 232 #define LOAD_FUNC(f) p##f = f
 233 #endif
 234
 235     LOAD_FUNC(Pa_Initialize);
 236     LOAD_FUNC(Pa_GetErrorText);
 237     LOAD_FUNC(Pa_StartStream);
 238     LOAD_FUNC(Pa_StopStream);
 239     LOAD_FUNC(Pa_OpenStream);
 240     LOAD_FUNC(Pa_CloseStream);
 241     LOAD_FUNC(Pa_GetDefaultOutputDevice);
 242 #undef LOAD_FUNC
 243
 244     if((err=pPa_Initialize()) != paNoError)
 245     {
 246         AL_PRINT("Pa_Initialize() returned an error: %s\n", pPa_GetErrorText(err));
 247         return;
 248     }
 249
 250     AppendDeviceList(pa_device);
 251     AppendAllDeviceList(pa_device);
 252 }
 253
 254 void alc_pa_deinit(void)
 255 {
 256 #ifdef HAVE_DLFCN_H
 257     dlclose(pa_handle);
 258     pa_handle = NULL;
 259 #endif
 260 }