[4668] | 1 | //driver_sysclock.c: |
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[2208] | 2 | |
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| 3 | /* |
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[4708] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2011 |
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[2208] | 5 | * |
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| 6 | * This file is part of roard a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * RoarAudio is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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[3517] | 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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[2208] | 23 | * |
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| 24 | */ |
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| 25 | |
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| 26 | #include "roard.h" |
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| 27 | |
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[2209] | 28 | #ifdef ROAR_HAVE_DRIVER_SYSCLOCK |
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[2367] | 29 | int driver_sysclock_open_vio(struct roar_vio_calls * inst, char * device, struct roar_audio_info * info, int fh, struct roar_stream_server * sstream) { |
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[2212] | 30 | struct driver_sysclock * self = malloc(sizeof(struct driver_sysclock)); |
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| 31 | |
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| 32 | if ( self == NULL ) |
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| 33 | return -1; |
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[2208] | 34 | |
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| 35 | if ( device != NULL ) { |
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| 36 | return -1; |
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| 37 | } |
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| 38 | |
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[2212] | 39 | memset(self, 0, sizeof(struct driver_sysclock)); |
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| 40 | memset(inst, 0, sizeof(struct roar_vio_calls)); |
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| 41 | |
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| 42 | inst->inst = self; |
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| 43 | inst->close = driver_sysclock_close; |
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| 44 | inst->write = driver_sysclock_write; |
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| 45 | |
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[2213] | 46 | self->bps = (info->bits / 8) * info->channels * info->rate; |
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[2212] | 47 | |
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[2213] | 48 | if (!self->bps) { |
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[2212] | 49 | free(self); |
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| 50 | return -1; |
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| 51 | } |
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| 52 | |
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| 53 | switch (info->codec) { |
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| 54 | case ROAR_CODEC_PCM_S_LE: |
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| 55 | case ROAR_CODEC_PCM_S_BE: |
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| 56 | case ROAR_CODEC_PCM_S_PDP: |
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| 57 | case ROAR_CODEC_PCM_U_LE: |
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| 58 | case ROAR_CODEC_PCM_U_BE: |
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| 59 | case ROAR_CODEC_PCM_U_PDP: |
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| 60 | break; |
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| 61 | case ROAR_CODEC_ALAW: |
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| 62 | case ROAR_CODEC_MULAW: |
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| 63 | // one byte per sample |
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[2213] | 64 | self->bps *= 8; |
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| 65 | self->bps /= info->bits; |
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[2212] | 66 | break; |
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| 67 | default: |
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| 68 | free(self); |
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| 69 | return -1; |
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| 70 | break; |
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| 71 | } |
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| 72 | |
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| 73 | gettimeofday(&(self->lasttime), NULL); |
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| 74 | |
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[2422] | 75 | self->last_wanted = 0; |
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| 76 | |
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[2212] | 77 | return 0; |
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| 78 | } |
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| 79 | |
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| 80 | int driver_sysclock_close (struct roar_vio_calls * vio) { |
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| 81 | struct driver_sysclock * self = vio->inst; |
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| 82 | |
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| 83 | if ( self == NULL ) |
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| 84 | return -1; |
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| 85 | |
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| 86 | free(self); |
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| 87 | |
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| 88 | return 0; |
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| 89 | } |
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| 90 | |
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| 91 | ssize_t driver_sysclock_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 92 | struct driver_sysclock * self = vio->inst; |
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[2213] | 93 | struct timeval now; |
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[2911] | 94 | long long diff = (1000000LL * count / (long long)self->bps); |
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[2422] | 95 | long long ago; |
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[2213] | 96 | |
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| 97 | gettimeofday(&now, NULL); |
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| 98 | |
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| 99 | ago = now.tv_usec - self->lasttime.tv_usec; |
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| 100 | ago += 1000000*(now.tv_sec - self->lasttime.tv_sec); |
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| 101 | |
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[2422] | 102 | ago -= self->last_wanted; |
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| 103 | |
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[2213] | 104 | memcpy(&(self->lasttime), &now, sizeof(now)); |
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| 105 | |
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| 106 | ROAR_DBG("driver_sysclock_write(*): count=%u, bps=%u, diff=%llu, ago=%llu", count, self->bps, diff, ago); |
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| 107 | |
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| 108 | diff -= ago; |
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| 109 | |
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[2422] | 110 | self->last_wanted = diff; |
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| 111 | |
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[2911] | 112 | ROAR_DBG("driver_sysclock_write(*): diff=%lli", diff); |
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| 113 | |
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[2422] | 114 | if ( diff > 0 ) |
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| 115 | usleep(diff); |
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[2213] | 116 | |
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| 117 | return count; |
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[2208] | 118 | } |
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[2212] | 119 | |
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[2209] | 120 | #endif |
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[2208] | 121 | |
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| 122 | //ll |
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