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annotate src/audio/baudio/SDL_beaudio.cc @ 1997:46319c67b3d7

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Added int32 and float32 support (and some others!) to BeOS audio backend. Untested: No BeOS system here for compiling!
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 31 Aug 2006 22:15:07 +0000
parents c121d94672cb
children cbac0f77a799
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to the audio stream on BeOS */
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25
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26 #include <SoundPlayer.h>
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27
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28 #include "../../main/beos/SDL_BeApp.h"
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29
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30 extern "C"
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31 {
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32
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33 #include "SDL_audio.h"
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34 #include "../SDL_audio_c.h"
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35 #include "../SDL_sysaudio.h"
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36 #include "../../thread/beos/SDL_systhread_c.h"
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37 #include "SDL_beaudio.h"
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38
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39
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40 /* Audio driver functions */
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41 static int BE_OpenAudio(_THIS, SDL_AudioSpec * spec);
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42 static void BE_WaitAudio(_THIS);
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43 static void BE_PlayAudio(_THIS);
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44 static Uint8 *BE_GetAudioBuf(_THIS);
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45 static void BE_CloseAudio(_THIS);
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46
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47 /* Audio driver bootstrap functions */
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48
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49 static int Audio_Available(void)
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50 {
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51 return (1);
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52 }
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53
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54 static void Audio_DeleteDevice(SDL_AudioDevice * device)
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55 {
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56 SDL_free(device->hidden);
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57 SDL_free(device);
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58 }
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59
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60 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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61 {
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62 SDL_AudioDevice *device;
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63
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64 /* Initialize all variables that we clean on shutdown */
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65 device = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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66 if (device) {
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67 SDL_memset(device, 0, (sizeof *device));
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68 device->hidden = (struct SDL_PrivateAudioData *)
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69 SDL_malloc((sizeof *device->hidden));
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70 }
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71 if ((device == NULL) || (device->hidden == NULL)) {
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72 SDL_OutOfMemory();
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73 if (device) {
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74 SDL_free(device);
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75 }
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76 return (0);
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77 }
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78 SDL_memset(device->hidden, 0, (sizeof *device->hidden));
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79
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80 /* Set the function pointers */
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81 device->OpenAudio = BE_OpenAudio;
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82 device->WaitAudio = BE_WaitAudio;
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83 device->PlayAudio = BE_PlayAudio;
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84 device->GetAudioBuf = BE_GetAudioBuf;
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85 device->CloseAudio = BE_CloseAudio;
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86
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87 device->free = Audio_DeleteDevice;
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88
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89 return device;
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90 }
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91
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92 AudioBootStrap BAUDIO_bootstrap = {
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93 "baudio", "BeOS BSoundPlayer",
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94 Audio_Available, Audio_CreateDevice
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95 };
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96
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97 /* The BeOS callback for handling the audio buffer */
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98 static void FillSound(void *device, void *stream, size_t len,
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99 const media_raw_audio_format & format)
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100 {
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101 SDL_AudioDevice *audio = (SDL_AudioDevice *) device;
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102
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103 /* Silence the buffer, since it's ours */
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104 SDL_memset(stream, audio->spec.silence, len);
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105
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106 /* Only do soemthing if audio is enabled */
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107 if (!audio->enabled)
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108 return;
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109
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110 if (!audio->paused) {
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111 if (audio->convert.needed) {
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112 SDL_mutexP(audio->mixer_lock);
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113 (*audio->spec.callback) (audio->spec.userdata,
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114 (Uint8 *) audio->convert.buf,
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115 audio->convert.len);
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116 SDL_mutexV(audio->mixer_lock);
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117 SDL_ConvertAudio(&audio->convert);
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118 SDL_memcpy(stream, audio->convert.buf,
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119 audio->convert.len_cvt);
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120 } else {
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121 SDL_mutexP(audio->mixer_lock);
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122 (*audio->spec.callback) (audio->spec.userdata,
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123 (Uint8 *) stream, len);
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124 SDL_mutexV(audio->mixer_lock);
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125 }
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126 }
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127 return;
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128 }
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129
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130 /* Dummy functions -- we don't use thread-based audio */
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131 void BE_WaitAudio(_THIS)
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132 {
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133 return;
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134 }
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135 void BE_PlayAudio(_THIS)
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136 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
137 return;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
138 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
139 Uint8 *BE_GetAudioBuf(_THIS)
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diff changeset
140 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
141 return (NULL);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
142 }
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143
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
144 void BE_CloseAudio(_THIS)
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145 {
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diff changeset
146 if (audio_obj) {
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147 audio_obj->Stop();
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diff changeset
148 delete audio_obj;
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149 audio_obj = NULL;
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150 }
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151
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152 /* Quit the Be Application, if there's nothing left to do */
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153 SDL_QuitBeApp();
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154 }
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155
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156 int BE_OpenAudio(_THIS, SDL_AudioSpec * spec)
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157 {
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158 media_raw_audio_format format;
1997
46319c67b3d7 Added int32 and float32 support (and some others!) to BeOS audio backend.
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diff changeset
159 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
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diff changeset
160 int valid_datatype = 0;
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diff changeset
161
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162 /* Parse the audio format and fill the Be raw audio format */
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163 memset(&format, '\0', sizeof (media_raw_audio_format));
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diff changeset
164 format.byte_order = B_MEDIA_LITTLE_ENDIAN;
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165 format.frame_rate = (float) spec->freq;
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166 format.channel_count = spec->channels; /* !!! FIXME: support > 2? */
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diff changeset
167 while ((!valid_datatype) && (test_format)) {
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diff changeset
168 spec->format = test_format;
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diff changeset
169 switch (test_format) {
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diff changeset
170 case AUDIO_S8:
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171 valid_datatype = 1;
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172 format.format = media_raw_audio_format::B_AUDIO_CHAR;
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173 break;
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174
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175 case AUDIO_U8:
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176 valid_datatype = 1;
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177 format.format = media_raw_audio_format::B_AUDIO_UCHAR;
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178 break;
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179
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180 case AUDIO_S16LSB:
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181 valid_datatype = 1;
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182 format.format = media_raw_audio_format::B_AUDIO_SHORT;
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183 break;
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184
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185 case AUDIO_S16MSB:
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186 valid_datatype = 1;
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187 format.format = media_raw_audio_format::B_AUDIO_SHORT;
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188 format.byte_order = B_MEDIA_BIG_ENDIAN;
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189 break;
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190
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191 case AUDIO_S32LSB:
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192 valid_datatype = 1;
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193 format.format = media_raw_audio_format::B_AUDIO_INT;
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194 break;
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195
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196 case AUDIO_S32MSB:
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197 valid_datatype = 1;
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198 format.format = media_raw_audio_format::B_AUDIO_INT;
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199 format.byte_order = B_MEDIA_BIG_ENDIAN;
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200 break;
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201
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202 case AUDIO_F32LSB:
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203 valid_datatype = 1;
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204 format.format = media_raw_audio_format::B_AUDIO_FLOAT;
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205 break;
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206
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diff changeset
207 case AUDIO_F32MSB:
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208 valid_datatype = 1;
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diff changeset
209 format.format = media_raw_audio_format::B_AUDIO_FLOAT;
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diff changeset
210 format.byte_order = B_MEDIA_BIG_ENDIAN;
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211 break;
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212
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diff changeset
213 default:
46319c67b3d7 Added int32 and float32 support (and some others!) to BeOS audio backend.
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diff changeset
214 test_format = SDL_NextAudioFormat();
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215 break;
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216 }
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217 }
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218
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diff changeset
219 format.buffer_size = spec->samples;
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220
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diff changeset
221 if (!valid_datatype) { /* shouldn't happen, but just in case... */
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diff changeset
222 SDL_SetError("Unsupported audio format");
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diff changeset
223 return (-1);
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diff changeset
224 }
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225
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226 /* Initialize the Be Application, if it's not already started */
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227 if (SDL_InitBeApp() < 0) {
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228 return (-1);
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229 }
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230
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231 /* Calculate the final parameters for this audio specification */
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232 SDL_CalculateAudioSpec(spec);
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233
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234 /* Subscribe to the audio stream (creates a new thread) */
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235 {
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diff changeset
236 sigset_t omask;
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diff changeset
237 SDL_MaskSignals(&omask);
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diff changeset
238 audio_obj = new BSoundPlayer(&format, "SDL Audio", FillSound,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
239 NULL, _this);
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diff changeset
240 SDL_UnmaskSignals(&omask);
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diff changeset
241 }
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parents: 1403
diff changeset
242 if (audio_obj->Start() == B_NO_ERROR) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
243 audio_obj->SetHasData(true);
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diff changeset
244 } else {
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diff changeset
245 SDL_SetError("Unable to start Be audio");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
246 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
247 }
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diff changeset
248
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diff changeset
249 /* We're running! */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
250 return (1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1403
diff changeset
251 }
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diff changeset
252
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
253 }; /* Extern C */
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diff changeset
254
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
255 /* vi: set ts=4 sw=4 expandtab: */