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annotate src/audio/android/SDL_androidaudio.c @ 4995:9f9bea41e88f

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Working audio implementation contributed by Joseph Lunderville
author Sam Lantinga <slouken@libsdl.org>
date Thu, 13 Jan 2011 11:14:20 -0800
parents 58b6bb4a45e9
children 8d7315668e35
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 /* Output audio to Android */
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25
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26 #include "SDL_audio.h"
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27 #include "../SDL_audio_c.h"
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28 #include "SDL_androidaudio.h"
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29
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30 #include "../../SDL_android.h"
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31
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32 #include <android/log.h>
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33
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34 static void * audioDevice;
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35
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36 static int
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37 AndroidAUD_OpenDevice(_THIS, const char *devname, int iscapture)
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38 {
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39 SDL_AudioFormat test_format;
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40 int valid_datatype = 0;
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41
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42 if (iscapture) {
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43 //TODO: implement capture
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44 SDL_SetError("Capture not supported on Android");
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45 return 0;
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46 }
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47
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48 if (audioDevice != NULL) {
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49 SDL_SetError("Only one audio device at a time please!");
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50 return 0;
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51 }
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52
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53 audioDevice = this;
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54
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55 this->hidden = SDL_malloc(sizeof(*(this->hidden)));
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56 if (!this->hidden) {
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57 SDL_OutOfMemory();
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58 return 0;
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59 }
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60 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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61
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62 test_format = SDL_FirstAudioFormat(this->spec.format);
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63 while (test_format != 0) { // no "UNKNOWN" constant
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64 if ((test_format == AUDIO_U8) || (test_format == AUDIO_S16LSB)) {
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65 this->spec.format = test_format;
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66 break;
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67 }
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68 test_format = SDL_NextAudioFormat();
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69 }
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70
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71 if (test_format == 0) {
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72 // Didn't find a compatible format :(
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73 SDL_SetError("No compatible audio format!");
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74 return 0;
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75 }
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76
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77 if (this->spec.channels > 1) {
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78 this->spec.channels = 2;
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79 } else {
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80 this->spec.channels = 1;
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81 }
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82
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83 if (this->spec.freq < 8000) {
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84 this->spec.freq = 8000;
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85 }
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86 if (this->spec.freq > 48000) {
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87 this->spec.freq = 48000;
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88 }
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89
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90 // TODO: pass in/return a (Java) device ID, also whether we're opening for input or output
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91 this->spec.samples = Android_JNI_OpenAudioDevice(this->spec.freq, this->spec.format == AUDIO_U8 ? 0 : 1, this->spec.channels, this->spec.samples);
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92 SDL_CalculateAudioSpec(&this->spec);
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93
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94 if (this->spec.samples == 0) {
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95 // Init failed?
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96 SDL_SetError("Java-side initialization failed!");
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97 return 0;
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98 }
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99
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100 return 1;
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101 }
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102
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103 static void
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104 AndroidAUD_PlayDevice(_THIS)
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105 {
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106 Android_JNI_WriteAudioBufferAndUnpin();
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107 this->hidden->mixbuf = NULL;
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108 }
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109
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110 static Uint8 *
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111 AndroidAUD_GetDeviceBuf(_THIS)
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112 {
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113 if (this->hidden->mixbuf == NULL) {
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114 this->hidden->mixbuf = Android_JNI_PinAudioBuffer();
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115 }
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116 return this->hidden->mixbuf;
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117 }
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118
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119 static void
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120 AndroidAUD_CloseDevice(_THIS)
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121 {
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122 if (this->hidden != NULL) {
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123 if (this->hidden->mixbuf != NULL) {
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124 Android_JNI_WriteAudioBufferAndUnpin();
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125 }
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126 SDL_free(this->hidden);
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127 this->hidden = NULL;
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128 }
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129 Android_JNI_CloseAudioDevice();
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130
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131 if (audioDevice == this) {
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132 audioDevice = NULL;
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133 }
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134 }
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135
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136 static int
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137 AndroidAUD_Init(SDL_AudioDriverImpl * impl)
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138 {
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139 /* Set the function pointers */
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140 impl->OpenDevice = AndroidAUD_OpenDevice;
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141 impl->PlayDevice = AndroidAUD_PlayDevice;
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142 impl->GetDeviceBuf = AndroidAUD_GetDeviceBuf;
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143 impl->CloseDevice = AndroidAUD_CloseDevice;
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144
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145 /* and the capabilities */
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146 impl->ProvidesOwnCallbackThread = 1;
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147 impl->HasCaptureSupport = 0; //TODO
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148 impl->OnlyHasDefaultOutputDevice = 1;
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149 impl->OnlyHasDefaultInputDevice = 1;
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150
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151 return 1; /* this audio target is available. */
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152 }
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153
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154 AudioBootStrap ANDROIDAUD_bootstrap = {
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155 "android", "SDL Android audio driver", AndroidAUD_Init, 0 /*1? */
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156 };
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157
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158 /* Called by the Java code to start the audio processing on a thread */
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159 void
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160 Android_RunAudioThread()
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161 {
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162 SDL_RunAudio(audioDevice);
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163 }
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164
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165 /* vi: set ts=4 sw=4 expandtab: */