1 | /* -*- mode: C; tab-width:8; c-basic-offset:8 -*- |
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2 | * vi:set ts=8: |
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3 | * |
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4 | * al_ext_capture.c |
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5 | * |
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6 | * audio recording extension |
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7 | * |
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8 | */ |
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9 | #include "al_siteconfig.h" |
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10 | |
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11 | #include <AL/al.h> |
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12 | #include <AL/alc.h> |
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13 | #include <stdio.h> |
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14 | #include <stdlib.h> |
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15 | #include <string.h> |
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16 | |
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17 | #include "al_ext_needed.h" |
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18 | #include "al_ext_capture.h" |
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19 | |
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20 | #include "al_buffer.h" |
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21 | #include "al_error.h" |
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22 | #include "al_debug.h" |
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23 | #include "al_mixer.h" |
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24 | #include "al_source.h" |
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25 | #include "alc/alc_device.h" |
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26 | #include "alc/alc_context.h" |
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27 | #include "al_types.h" |
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28 | |
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29 | #include "audioconvert/audioconvert.h" |
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30 | |
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31 | #include "backends/alc_backend.h" |
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32 | #include "al_mutexlib.h" |
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33 | |
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34 | #ifdef OPENAL_EXTENSION |
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35 | |
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36 | /* |
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37 | * we are not being build into the library, therefore define the |
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38 | * table that informs openal how to register the extensions upon |
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39 | * dlopen. |
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40 | */ |
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41 | struct { ALubyte *name; void *addr; } alExtension_03222001 [] = { |
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42 | AL_EXT_PAIR(alCaptureInit_EXT), |
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43 | AL_EXT_PAIR(alCaptureStart_EXT), |
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44 | AL_EXT_PAIR(alCaptureStop_EXT), |
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45 | AL_EXT_PAIR(alCaptureGetData_EXT), |
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46 | AL_EXT_PAIR(alCaptureDestroy_EXT), |
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47 | { NULL, NULL } |
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48 | }; |
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49 | |
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50 | /* |
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51 | * We don't need init or fini functions, but we might as well |
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52 | * keep them in place if, in some distant future, they turn out |
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53 | * to be useful. |
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54 | */ |
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55 | void alExtInit_03282000(void) { |
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56 | fprintf(stderr, "alExtInit_03282000 STUB\n"); |
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57 | return; |
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58 | } |
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59 | |
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60 | void alExtFini_03282000(void) { |
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61 | fprintf(stderr, "alExtFini_03282000 STUB\n"); |
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62 | return; |
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63 | } |
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64 | #endif /* OPENAL_EXTENSION */ |
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65 | |
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66 | void alInitCapture(void) { |
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67 | return; |
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68 | } |
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69 | |
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70 | void alFiniCapture(void) { |
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71 | return; |
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72 | } |
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73 | |
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74 | ALboolean alCaptureInit_EXT( UNUSED(ALenum format), |
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75 | UNUSED(ALuint rate), |
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76 | UNUSED(ALsizei bufferSize) ) |
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77 | { |
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78 | ALuint cid; |
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79 | AL_context *cc; |
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80 | AL_device *capture_device; |
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81 | |
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82 | /* get the current context */ |
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83 | capture_device = NULL; |
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84 | cid = _alcCCId; |
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85 | _alcLockContext( cid ); |
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86 | cc = _alcGetContext(cid); |
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87 | if ( cc != NULL ) { |
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88 | capture_device = cc->read_device; |
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89 | if ( capture_device == NULL ) { |
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90 | char spec[1024]; |
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91 | const char *fmt="'( (direction \"read\") (sampling-rate %d))"; |
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92 | |
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93 | snprintf(spec, sizeof(spec), fmt, rate); |
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94 | capture_device = alcOpenDevice((ALchar *)spec); |
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95 | if ( capture_device ) { |
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96 | _alcSetContext(NULL, cid, capture_device); |
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97 | _alcDeviceSet(capture_device); |
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98 | } |
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99 | } |
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100 | } |
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101 | _alcUnlockContext( cid ); |
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102 | |
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103 | return (capture_device != NULL); |
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104 | } |
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105 | |
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106 | ALboolean alCaptureDestroy_EXT( void ) |
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107 | { |
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108 | ALuint cid; |
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109 | AL_context *cc; |
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110 | |
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111 | /* get the current context */ |
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112 | cid = _alcCCId; |
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113 | _alcLockContext( cid ); |
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114 | cc = _alcGetContext(cid); |
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115 | if ( cc == NULL ) { |
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116 | _alcUnlockContext( cid ); |
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117 | return AL_FALSE; |
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118 | } |
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119 | |
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120 | if ( cc->read_device ) { |
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121 | /* Only close it if we opened it originally */ |
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122 | if (cc->write_device && (cc->read_device != cc->write_device)) { |
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123 | alcCloseDevice(cc->read_device); |
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124 | cc->read_device = NULL; |
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125 | } |
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126 | } |
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127 | _alcUnlockContext( cid ); |
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128 | |
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129 | return AL_TRUE; |
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130 | } |
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131 | |
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132 | ALboolean alCaptureStart_EXT( void ) |
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133 | { |
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134 | return AL_FALSE; |
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135 | } |
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136 | |
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137 | ALboolean alCaptureStop_EXT( void ) |
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138 | { |
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139 | return AL_FALSE; |
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140 | } |
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141 | |
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142 | ALsizei alCaptureGetData_EXT( UNUSED(ALvoid* data), |
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143 | ALsizei n, |
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144 | UNUSED(ALenum format), |
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145 | UNUSED(ALuint rate) ) |
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146 | { |
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147 | AL_device *dev; |
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148 | ALuint size; |
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149 | ALuint cid; |
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150 | AL_context *cc; |
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151 | |
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152 | /* get the read device */ |
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153 | cid = _alcCCId; |
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154 | cc = _alcGetContext(cid); |
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155 | if ( cc == NULL ) { |
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156 | return 0; |
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157 | } |
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158 | dev = cc->read_device; |
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159 | |
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160 | if ( (dev->format == format) && (dev->speed == rate) ) { |
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161 | size = _alcDeviceRead(cid, data, (ALuint)n); |
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162 | } else { |
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163 | ALuint samples; |
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164 | void *temp; |
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165 | |
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166 | samples = n / (_alGetBitsFromFormat(format) / 8); |
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167 | |
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168 | /* Set size to the bytes of raw audio data we need */ |
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169 | size = _al_PCMRatioify(rate, dev->speed, |
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170 | format, dev->format, samples); |
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171 | size *= (_alGetBitsFromFormat(dev->format) / 8); |
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172 | |
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173 | if ( n > (ALsizei)size ) |
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174 | temp = malloc( (size_t)n ); |
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175 | else |
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176 | temp = malloc( (size_t)size ); |
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177 | |
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178 | if ( size > 0 ) { |
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179 | size = _alcDeviceRead(cid, temp, size); |
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180 | |
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181 | temp = (void *)_alBufferCanonizeData(dev->format, |
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182 | temp, |
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183 | size, |
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184 | dev->speed, |
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185 | format, |
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186 | rate, |
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187 | &size, |
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188 | AL_TRUE); |
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189 | } else { |
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190 | /* Hmm, zero size in record.. */ |
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191 | memset(temp, 0, (size_t)n); |
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192 | size = n; |
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193 | } |
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194 | if(temp == NULL) { |
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195 | fprintf(stderr, "could not canonize data\n"); |
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196 | return 0; |
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197 | } |
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198 | |
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199 | memcpy(data, temp, size); |
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200 | |
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201 | free( temp ); |
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202 | } |
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203 | return size; |
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204 | } |
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