[4165] | 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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[4166] | 45 | while (1) { |
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[4165] | 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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[4166] | 158 | struct timespec now_tv; |
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| 159 | int64_t temp, temp2; |
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| 160 | |
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[4165] | 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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[4166] | 169 | temp = (int64_t)now_tv.tv_sec - (int64_t)self->start_tv.tv_sec; |
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[4165] | 170 | |
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[4166] | 171 | temp *= self->info.rate * self->info.channels * self->info.bits / 8; |
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[4165] | 172 | |
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[4166] | 173 | temp2 = (int64_t)now_tv.tv_nsec - (int64_t)self->start_tv.tv_nsec; |
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[4165] | 174 | temp2 *= self->info.rate * self->info.channels * self->info.bits / 8; |
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[4166] | 175 | temp2 /= 1000000000LL; |
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| 176 | temp += temp2; |
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[4165] | 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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[4166] | 184 | //ll |
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