source: roaraudio/roard/driver_sysclock.c @ 5961:06e7fd9e4c25

Last change on this file since 5961:06e7fd9e4c25 was 5961:06e7fd9e4c25, checked in by phi, 10 years ago

Updates of copyright and license headers

File size: 2.9 KB
Line 
1//driver_sysclock.c:
2
3/*
4 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2014
5 *
6 *  This file is part of roard a part of RoarAudio,
7 *  a cross-platform sound system for both, home and professional use.
8 *  See README for details.
9 *
10 *  This file is free software; you can redistribute it and/or modify
11 *  it under the terms of the GNU General Public License version 3
12 *  as published by the Free Software Foundation.
13 *
14 *  RoarAudio is distributed in the hope that it will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU General Public License for more details.
18 *
19 *  You should have received a copy of the GNU General Public License
20 *  along with this software; see the file COPYING.  If not, write to
21 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 *  Boston, MA 02110-1301, USA.
23 *
24 */
25
26#include "roard.h"
27
28#ifdef ROAR_HAVE_DRIVER_SYSCLOCK
29int driver_sysclock_open_vio(struct roar_vio_calls * inst, char * device, struct roar_audio_info * info, int fh, struct roar_stream_server * sstream) {
30 struct driver_sysclock * self = roar_mm_malloc(sizeof(struct driver_sysclock));
31
32 if ( self == NULL )
33  return -1;
34
35 if ( device != NULL ) {
36  return -1;
37 }
38
39 memset(self, 0, sizeof(struct driver_sysclock));
40 memset(inst, 0, sizeof(struct roar_vio_calls));
41 inst->flags    = ROAR_VIO_FLAGS_NONE;
42 inst->refc     = 1;
43
44 inst->inst     = self;
45 inst->close    = driver_sysclock_close;
46 inst->write    = driver_sysclock_write;
47 inst->ctl      = driver_dummy_ctl;
48
49 self->bps      = roar_info2bitspersec(info)/8;
50
51 if (!self->bps) {
52  roar_mm_free(self);
53  return -1;
54 }
55
56 switch (info->codec) {
57  case ROAR_CODEC_PCM_S_LE:
58  case ROAR_CODEC_PCM_S_BE:
59  case ROAR_CODEC_PCM_S_PDP:
60  case ROAR_CODEC_PCM_U_LE:
61  case ROAR_CODEC_PCM_U_BE:
62  case ROAR_CODEC_PCM_U_PDP:
63  case ROAR_CODEC_ALAW:
64  case ROAR_CODEC_MULAW:
65   break;
66  default:
67    roar_mm_free(self);
68    return -1;
69   break;
70 }
71
72 gettimeofday(&(self->lasttime), NULL);
73
74 self->last_wanted = 0;
75
76 return 0;
77}
78
79int     driver_sysclock_close   (struct roar_vio_calls * vio) {
80 struct driver_sysclock * self = vio->inst;
81
82 if ( self == NULL )
83  return -1;
84
85 roar_mm_free(self);
86
87 return 0;
88}
89
90ssize_t driver_sysclock_write   (struct roar_vio_calls * vio, void *buf, size_t count) {
91 struct driver_sysclock * self = vio->inst;
92 struct timeval now;
93 long long diff = (1000000LL * count / (long long)self->bps);
94 long long ago;
95
96 gettimeofday(&now, NULL);
97
98 ago  = now.tv_usec - self->lasttime.tv_usec;
99 ago += 1000000*(now.tv_sec - self->lasttime.tv_sec);
100
101 ago -= self->last_wanted;
102
103 memcpy(&(self->lasttime), &now, sizeof(now));
104
105 ROAR_DBG("driver_sysclock_write(*): count=%u, bps=%u, diff=%llu, ago=%llu", count, self->bps, diff, ago);
106
107 diff -= ago;
108
109 self->last_wanted = diff;
110
111 ROAR_DBG("driver_sysclock_write(*): diff=%lli", diff);
112
113 if ( diff > 0 )
114  roar_usleep(diff);
115
116 return count;
117}
118
119#endif
120
121//ll
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