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
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
38
41
43
45 {
48 int ret;
49
51 if (!st) {
53 }
54
56 if (ret < 0) {
58 }
59
60 /* take real parameters */
65
67 return 0;
68 }
69
71 {
73 int ret, bdelay;
74 int64_t cur_time;
75 struct audio_buf_info abufi;
76
78 return ret;
79
81 if (ret <= 0){
84 if (ret<0)
return AVERROR(errno);
86 }
88
89 /* compute pts of the start of the packet */
91 bdelay = ret;
92 if (ioctl(s->
fd, SNDCTL_DSP_GETISPACE, &abufi) == 0) {
93 bdelay += abufi.bytes;
94 }
95 /* subtract time represented by the number of bytes in the audio fifo */
97
98 /* convert to wanted units */
100
102 int i;
103 short *p = (
short *) pkt->
data;
104
105 for (i = 0; i < ret; i += 4) {
106 *p = ~*p;
107 p += 2;
108 }
109 }
110 return 0;
111 }
112
114 {
116
118 return 0;
119 }
120
125 };
126
133 };
134
143 .priv_class = &oss_demuxer_class,
144 };
#define LIBAVUTIL_VERSION_INT
static const AVOption options[]
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
const char * av_default_item_name(void *ptr)
Return the context name.
static int audio_read_header(AVFormatContext *s1)
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
static av_cold int read_close(AVFormatContext *ctx)
int ff_oss_audio_open(AVFormatContext *s1, int is_output, const char *audio_device)
Main libavdevice API header.
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
char * url
input or output URL.
enum AVMediaType codec_type
General type of the encoded data.
static int audio_read_close(AVFormatContext *s1)
static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
common internal API header
static int read_header(FFV1Context *f)
int64_t av_gettime(void)
Get the current time in microseconds.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
static const AVClass oss_demuxer_class
Libavcodec external API header.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Describe the class of an AVClass context structure.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
int sample_rate
Audio only.
int ff_oss_audio_close(OSSAudioData *s)
void * priv_data
Format private data.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
This structure stores compressed data.
AVInputFormat ff_oss_demuxer
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...