1 /*
2 * Linux audio play interface
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "config.h"
23
24 #include <stdint.h>
25
26 #if HAVE_UNISTD_H
27 #include <unistd.h>
28 #endif
29 #include <fcntl.h>
30 #include <sys/ioctl.h>
31 #include <sys/soundcard.h>
32
36
40
42
44 {
48
50 if (!st) {
52 }
53
57 }
58
59 /* take real parameters */
64
66 return 0;
67 }
68
70 {
74 struct audio_buf_info abufi;
75
78
85 }
87
88 /* compute pts of the start of the packet */
91 if (ioctl(
s->fd, SNDCTL_DSP_GETISPACE, &abufi) == 0) {
92 bdelay += abufi.bytes;
93 }
94 /* subtract time represented by the number of bytes in the audio fifo */
95 cur_time -= (bdelay * 1000000LL) / (
s->sample_rate *
s->sample_size *
s->channels);
96
97 /* convert to wanted units */
99
100 if (
s->flip_left &&
s->channels == 2) {
103
107 }
108 }
109 return 0;
110 }
111
113 {
115
117 return 0;
118 }
119
124 };
125
132 };
133
143 };