source: roaraudio/roard/driver_sysclock.c @ 3811:49db840fb4f4

Last change on this file since 3811:49db840fb4f4 was 3811:49db840fb4f4, checked in by phi, 14 years ago

fixed some copyright statements

File size: 2.9 KB
Line 
1//driver_raw.c:
2
3/*
4 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2010
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 = 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
42 inst->inst  = self;
43 inst->close = driver_sysclock_close;
44 inst->write = driver_sysclock_write;
45
46 self->bps   = (info->bits / 8) * info->channels * info->rate;
47
48 if (!self->bps) {
49  free(self);
50  return -1;
51 }
52
53 switch (info->codec) {
54  case ROAR_CODEC_PCM_S_LE:
55  case ROAR_CODEC_PCM_S_BE:
56  case ROAR_CODEC_PCM_S_PDP:
57  case ROAR_CODEC_PCM_U_LE:
58  case ROAR_CODEC_PCM_U_BE:
59  case ROAR_CODEC_PCM_U_PDP:
60   break;
61  case ROAR_CODEC_ALAW:
62  case ROAR_CODEC_MULAW:
63    // one byte per sample
64    self->bps *= 8;
65    self->bps /= info->bits;
66   break;
67  default:
68    free(self);
69    return -1;
70   break;
71 }
72
73 gettimeofday(&(self->lasttime), NULL);
74
75 self->last_wanted = 0;
76
77 return 0;
78}
79
80int     driver_sysclock_close   (struct roar_vio_calls * vio) {
81 struct driver_sysclock * self = vio->inst;
82
83 if ( self == NULL )
84  return -1;
85
86 free(self);
87
88 return 0;
89}
90
91ssize_t driver_sysclock_write   (struct roar_vio_calls * vio, void *buf, size_t count) {
92 struct driver_sysclock * self = vio->inst;
93 struct timeval now;
94 long long diff = (1000000LL * count / (long long)self->bps);
95 long long ago;
96
97 gettimeofday(&now, NULL);
98
99 ago  = now.tv_usec - self->lasttime.tv_usec;
100 ago += 1000000*(now.tv_sec - self->lasttime.tv_sec);
101
102 ago -= self->last_wanted;
103
104 memcpy(&(self->lasttime), &now, sizeof(now));
105
106 ROAR_DBG("driver_sysclock_write(*): count=%u, bps=%u, diff=%llu, ago=%llu", count, self->bps, diff, ago);
107
108 diff -= ago;
109
110 self->last_wanted = diff;
111
112 ROAR_DBG("driver_sysclock_write(*): diff=%lli", diff);
113
114 if ( diff > 0 )
115  usleep(diff);
116
117 return count;
118}
119
120#endif
121
122//ll
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