GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavdevice/oss_dec.c Lines: 0 41 0.0 %
Date: 2020-09-25 14:59:26 Branches: 0 18 0.0 %

Line Branch Exec Source
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
33
#include "libavutil/internal.h"
34
#include "libavutil/opt.h"
35
#include "libavutil/time.h"
36
37
#include "libavcodec/avcodec.h"
38
39
#include "avdevice.h"
40
#include "libavformat/internal.h"
41
42
#include "oss.h"
43
44
static int audio_read_header(AVFormatContext *s1)
45
{
46
    OSSAudioData *s = s1->priv_data;
47
    AVStream *st;
48
    int ret;
49
50
    st = avformat_new_stream(s1, NULL);
51
    if (!st) {
52
        return AVERROR(ENOMEM);
53
    }
54
55
    ret = ff_oss_audio_open(s1, 0, s1->url);
56
    if (ret < 0) {
57
        return AVERROR(EIO);
58
    }
59
60
    /* take real parameters */
61
    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
62
    st->codecpar->codec_id = s->codec_id;
63
    st->codecpar->sample_rate = s->sample_rate;
64
    st->codecpar->channels = s->channels;
65
66
    avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
67
    return 0;
68
}
69
70
static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
71
{
72
    OSSAudioData *s = s1->priv_data;
73
    int ret, bdelay;
74
    int64_t cur_time;
75
    struct audio_buf_info abufi;
76
77
    if ((ret=av_new_packet(pkt, s->frame_size)) < 0)
78
        return ret;
79
80
    ret = read(s->fd, pkt->data, pkt->size);
81
    if (ret <= 0){
82
        av_packet_unref(pkt);
83
        pkt->size = 0;
84
        if (ret<0)  return AVERROR(errno);
85
        else        return AVERROR_EOF;
86
    }
87
    pkt->size = ret;
88
89
    /* compute pts of the start of the packet */
90
    cur_time = av_gettime();
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 */
96
    cur_time -= (bdelay * 1000000LL) / (s->sample_rate * s->channels);
97
98
    /* convert to wanted units */
99
    pkt->pts = cur_time;
100
101
    if (s->flip_left && s->channels == 2) {
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
113
static int audio_read_close(AVFormatContext *s1)
114
{
115
    OSSAudioData *s = s1->priv_data;
116
117
    ff_oss_audio_close(s);
118
    return 0;
119
}
120
121
static const AVOption options[] = {
122
    { "sample_rate", "", offsetof(OSSAudioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
123
    { "channels",    "", offsetof(OSSAudioData, channels),    AV_OPT_TYPE_INT, {.i64 = 2},     1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
124
    { NULL },
125
};
126
127
static const AVClass oss_demuxer_class = {
128
    .class_name     = "OSS indev",
129
    .item_name      = av_default_item_name,
130
    .option         = options,
131
    .version        = LIBAVUTIL_VERSION_INT,
132
    .category       = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
133
};
134
135
AVInputFormat ff_oss_demuxer = {
136
    .name           = "oss",
137
    .long_name      = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) capture"),
138
    .priv_data_size = sizeof(OSSAudioData),
139
    .read_header    = audio_read_header,
140
    .read_packet    = audio_read_packet,
141
    .read_close     = audio_read_close,
142
    .flags          = AVFMT_NOFILE,
143
    .priv_class     = &oss_demuxer_class,
144
};