[2208] | 1 | //driver_raw.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
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| 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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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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| 25 | #include "roard.h" |
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| 26 | |
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[2209] | 27 | #ifdef ROAR_HAVE_DRIVER_SYSCLOCK |
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[2367] | 28 | 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] | 29 | struct driver_sysclock * self = malloc(sizeof(struct driver_sysclock)); |
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| 30 | |
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| 31 | if ( self == NULL ) |
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| 32 | return -1; |
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[2208] | 33 | |
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| 34 | if ( device != NULL ) { |
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| 35 | return -1; |
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| 36 | } |
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| 37 | |
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[2212] | 38 | memset(self, 0, sizeof(struct driver_sysclock)); |
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| 39 | memset(inst, 0, sizeof(struct roar_vio_calls)); |
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| 40 | |
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| 41 | inst->inst = self; |
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| 42 | inst->close = driver_sysclock_close; |
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| 43 | inst->write = driver_sysclock_write; |
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| 44 | |
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[2213] | 45 | self->bps = (info->bits / 8) * info->channels * info->rate; |
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[2212] | 46 | |
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[2213] | 47 | if (!self->bps) { |
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[2212] | 48 | free(self); |
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| 49 | return -1; |
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| 50 | } |
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| 51 | |
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| 52 | switch (info->codec) { |
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| 53 | case ROAR_CODEC_PCM_S_LE: |
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| 54 | case ROAR_CODEC_PCM_S_BE: |
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| 55 | case ROAR_CODEC_PCM_S_PDP: |
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| 56 | case ROAR_CODEC_PCM_U_LE: |
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| 57 | case ROAR_CODEC_PCM_U_BE: |
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| 58 | case ROAR_CODEC_PCM_U_PDP: |
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| 59 | break; |
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| 60 | case ROAR_CODEC_ALAW: |
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| 61 | case ROAR_CODEC_MULAW: |
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| 62 | // one byte per sample |
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[2213] | 63 | self->bps *= 8; |
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| 64 | self->bps /= info->bits; |
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[2212] | 65 | break; |
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| 66 | default: |
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| 67 | free(self); |
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| 68 | return -1; |
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| 69 | break; |
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| 70 | } |
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| 71 | |
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| 72 | gettimeofday(&(self->lasttime), NULL); |
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| 73 | |
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| 74 | return 0; |
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| 75 | } |
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| 76 | |
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| 77 | int driver_sysclock_close (struct roar_vio_calls * vio) { |
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| 78 | struct driver_sysclock * self = vio->inst; |
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| 79 | |
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| 80 | if ( self == NULL ) |
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| 81 | return -1; |
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| 82 | |
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| 83 | free(self); |
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| 84 | |
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| 85 | return 0; |
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| 86 | } |
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| 87 | |
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| 88 | ssize_t driver_sysclock_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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| 89 | struct driver_sysclock * self = vio->inst; |
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[2213] | 90 | struct timeval now; |
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| 91 | unsigned long long diff = (1000000 * count / self->bps); |
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| 92 | unsigned long long ago; |
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| 93 | |
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| 94 | gettimeofday(&now, NULL); |
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| 95 | |
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| 96 | ago = now.tv_usec - self->lasttime.tv_usec; |
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| 97 | ago += 1000000*(now.tv_sec - self->lasttime.tv_sec); |
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| 98 | |
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| 99 | memcpy(&(self->lasttime), &now, sizeof(now)); |
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| 100 | |
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| 101 | ROAR_DBG("driver_sysclock_write(*): count=%u, bps=%u, diff=%llu, ago=%llu", count, self->bps, diff, ago); |
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| 102 | |
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| 103 | if ( diff <= ago ) |
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| 104 | return count; |
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| 105 | |
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| 106 | diff -= ago; |
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| 107 | |
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| 108 | usleep(diff); |
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| 109 | |
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| 110 | return count; |
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[2208] | 111 | } |
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[2212] | 112 | |
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[2209] | 113 | #endif |
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[2208] | 114 | |
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| 115 | //ll |
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