1 | //thread.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
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5 | * Copyright (C) Hans-Kristian 'maister' Arntzen - 2010 |
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6 | * |
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7 | * This file is part of libroar a part of RoarAudio, |
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8 | * a cross-platform sound system for both, home and professional use. |
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9 | * See README for details. |
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10 | * |
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11 | * This file is free software; you can redistribute it and/or modify |
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12 | * it under the terms of the GNU General Public License version 3 |
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13 | * as published by the Free Software Foundation. |
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14 | * |
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15 | * libroar is distributed in the hope that it will be useful, |
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 | * GNU General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU General Public License |
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21 | * along with this software; see the file COPYING. If not, write to |
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22 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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23 | * Boston, MA 02110-1301, USA. |
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24 | * |
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25 | * NOTE for everyone want's to change something and send patches: |
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26 | * read README and HACKING! There a addition information on |
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27 | * the license of this document you need to read before you send |
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28 | * any patches. |
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29 | * |
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30 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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31 | * or libpulse*: |
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32 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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33 | * and are therefore GPL. Because of this it may be illigal to use |
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34 | * them with any software that uses libesd, libartsc or libpulse*. |
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35 | */ |
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36 | |
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37 | |
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38 | #include "roar.h" |
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39 | #define CHUNK_SIZE 256 |
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40 | |
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41 | |
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42 | // Writes to the FIFO buffer. Waits until there is room to write. |
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43 | size_t roar_write(struct roar_alsa_pcm *self, const char *buf, size_t size) { |
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44 | /* Wait until we have a ready buffer */ |
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45 | while (1) { |
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46 | /* Should the thread be shut down while we're running, return with error */ |
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47 | if ( !self->thread_active ) |
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48 | return 0; |
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49 | |
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50 | //fprintf(stderr, "%d + %d : %d\n", (int)self->bufptr, (int)size, (int)self->bufsize); |
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51 | pthread_mutex_lock(&(self->lock)); |
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52 | if (self->bufptr + size <= self->bufsize) { |
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53 | pthread_mutex_unlock(&(self->lock)); |
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54 | break; |
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55 | } |
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56 | pthread_mutex_unlock(&(self->lock)); |
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57 | |
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58 | pthread_cond_signal(&(self->cond)); |
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59 | /* Sleeps until we can write to the FIFO. */ |
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60 | pthread_mutex_lock(&(self->cond_lock)); |
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61 | pthread_cond_wait(&(self->cond), &(self->cond_lock)); |
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62 | pthread_mutex_unlock(&(self->cond_lock)); |
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63 | } |
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64 | |
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65 | pthread_mutex_lock(&(self->lock)); |
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66 | memcpy(self->buffer + self->bufptr, buf, size); |
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67 | self->bufptr += (int)size; |
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68 | pthread_mutex_unlock(&(self->lock)); |
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69 | |
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70 | /* Send signal to thread that buffer has been updated */ |
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71 | pthread_cond_signal(&(self->cond)); |
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72 | |
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73 | return size; |
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74 | } |
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75 | |
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76 | #define _TEST_CANCEL() do { \ |
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77 | if ( !self->thread_active ) \ |
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78 | goto test_quit; \ |
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79 | } while(0) |
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80 | |
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81 | // Attemps to drain the buffer at all times and write to libroar. |
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82 | // If there is no data, it will wait for roar_write() to fill up more data. |
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83 | void* roar_thread (void * thread_data) { |
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84 | /* We share data between thread and callable functions */ |
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85 | struct roar_alsa_pcm *self = thread_data; |
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86 | int rc; |
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87 | |
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88 | /* Plays back data as long as there is data in the buffer. Else, sleep until it can. */ |
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89 | /* Two loops! :3 Beware! */ |
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90 | while(1) { |
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91 | while(1) { |
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92 | _TEST_CANCEL(); |
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93 | // We ask the server to send its latest backend data. Do not really care about errors atm. |
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94 | // We only bother to check after 1 sec of audio has been played, as it might be quite inaccurate in the start of the stream. |
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95 | |
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96 | /* If the buffer is empty or we've stopped the stream. Jump out of this for loop */ |
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97 | pthread_mutex_lock(&(self->lock)); |
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98 | if ( self->bufptr < CHUNK_SIZE ) { |
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99 | pthread_mutex_unlock(&(self->lock)); |
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100 | break; |
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101 | } |
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102 | pthread_mutex_unlock(&(self->lock)); |
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103 | |
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104 | rc = roar_vio_write(&(self->stream_vio), self->buffer, CHUNK_SIZE); |
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105 | |
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106 | /* If this happens, we should make sure that subsequent and current calls to rsd_write() will fail. */ |
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107 | if ( rc < 0 ) { |
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108 | _TEST_CANCEL(); |
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109 | roar_reset(self); |
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110 | |
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111 | /* Wakes up a potentially sleeping fill_buffer() */ |
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112 | pthread_cond_signal(&(self->cond)); |
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113 | |
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114 | /* This thread will not be joined, so detach. */ |
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115 | pthread_detach(pthread_self()); |
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116 | pthread_exit(NULL); |
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117 | } |
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118 | |
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119 | if ( !self->has_written ) { |
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120 | pthread_mutex_lock(&(self->lock)); |
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121 | clock_gettime(CLOCK_MONOTONIC, &(self->start_tv)); |
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122 | self->has_written = 1; |
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123 | pthread_mutex_unlock(&(self->lock)); |
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124 | } |
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125 | |
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126 | pthread_mutex_lock(&(self->lock)); |
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127 | self->total_written += rc; |
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128 | pthread_mutex_unlock(&(self->lock)); |
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129 | |
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130 | /* "Drains" the buffer. This operation looks kinda expensive with large buffers, but hey. D: */ |
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131 | pthread_mutex_lock(&(self->lock)); |
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132 | memmove(self->buffer, self->buffer + rc, self->bufsize - rc); |
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133 | self->bufptr -= rc; |
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134 | pthread_mutex_unlock(&(self->lock)); |
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135 | |
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136 | /* Buffer has decreased, signal fill_buffer() */ |
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137 | pthread_cond_signal(&(self->cond)); |
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138 | |
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139 | } |
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140 | |
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141 | /* If we're still good to go, sleep. We are waiting for fill_buffer() to fill up some data. */ |
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142 | test_quit: |
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143 | if ( self->thread_active ) { |
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144 | pthread_cond_signal(&(self->cond)); |
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145 | pthread_mutex_lock(&(self->cond_lock)); |
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146 | pthread_cond_wait(&(self->cond), &(self->cond_lock)); |
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147 | pthread_mutex_unlock(&(self->cond_lock)); |
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148 | } else { |
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149 | /* Abandon the ship, chap. */ |
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150 | pthread_cond_signal(&(self->cond)); |
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151 | pthread_exit(NULL); |
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152 | } |
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153 | |
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154 | } |
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155 | } |
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156 | |
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157 | void roar_drain(struct roar_alsa_pcm *self) { |
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158 | struct timespec now_tv; |
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159 | int64_t temp, temp2; |
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160 | |
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161 | /* If the audio playback has started on the server we need to use timers. */ |
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162 | if ( self->has_written ) { |
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163 | |
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164 | /* Falls back to gettimeofday() when CLOCK_MONOTONIC is not supported */ |
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165 | |
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166 | /* Calculates the amount of bytes that the server has consumed. */ |
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167 | clock_gettime(CLOCK_MONOTONIC, &now_tv); |
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168 | |
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169 | temp = (int64_t)now_tv.tv_sec - (int64_t)self->start_tv.tv_sec; |
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170 | |
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171 | temp *= self->info.rate * self->info.channels * self->info.bits / 8; |
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172 | |
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173 | temp2 = (int64_t)now_tv.tv_nsec - (int64_t)self->start_tv.tv_nsec; |
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174 | temp2 *= self->info.rate * self->info.channels * self->info.bits / 8; |
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175 | temp2 /= 1000000000LL; |
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176 | temp += temp2; |
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177 | /* Calculates the amount of data we have in our virtual buffer. Only used to calculate delay. */ |
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178 | self->bytes_in_buffer = (int)((int64_t)self->total_written + (int64_t)self->bufptr - temp); |
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179 | } else { |
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180 | self->bytes_in_buffer = self->bufptr; |
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181 | } |
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182 | } |
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183 | |
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184 | //ll |
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