GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavdevice/v4l2enc.c Lines: 0 45 0.0 %
Date: 2020-09-25 23:16:12 Branches: 0 18 0.0 %

Line Branch Exec Source
1
/*
2
 * Copyright (c) 2013 Clément Bœsch
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20
21
#include "v4l2-common.h"
22
#include "avdevice.h"
23
24
typedef struct {
25
    AVClass *class;
26
    int fd;
27
} V4L2Context;
28
29
static av_cold int write_header(AVFormatContext *s1)
30
{
31
    int res = 0, flags = O_RDWR;
32
    struct v4l2_format fmt = {
33
        .type = V4L2_BUF_TYPE_VIDEO_OUTPUT
34
    };
35
    V4L2Context *s = s1->priv_data;
36
    AVCodecParameters *par;
37
    uint32_t v4l2_pixfmt;
38
39
    if (s1->flags & AVFMT_FLAG_NONBLOCK)
40
        flags |= O_NONBLOCK;
41
42
    s->fd = open(s1->url, flags);
43
    if (s->fd < 0) {
44
        res = AVERROR(errno);
45
        av_log(s1, AV_LOG_ERROR, "Unable to open V4L2 device '%s'\n", s1->url);
46
        return res;
47
    }
48
49
    if (s1->nb_streams != 1 ||
50
        s1->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
51
        av_log(s1, AV_LOG_ERROR,
52
               "V4L2 output device supports only a single raw video stream\n");
53
        return AVERROR(EINVAL);
54
    }
55
56
    par = s1->streams[0]->codecpar;
57
58
    if(par->codec_id == AV_CODEC_ID_RAWVIDEO) {
59
        v4l2_pixfmt = ff_fmt_ff2v4l(par->format, AV_CODEC_ID_RAWVIDEO);
60
    } else {
61
        v4l2_pixfmt = ff_fmt_ff2v4l(AV_PIX_FMT_NONE, par->codec_id);
62
    }
63
64
    if (!v4l2_pixfmt) { // XXX: try to force them one by one?
65
        av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for %s\n",
66
               av_get_pix_fmt_name(par->format));
67
        return AVERROR(EINVAL);
68
    }
69
70
    if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
71
        res = AVERROR(errno);
72
        av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res));
73
        return res;
74
    }
75
76
    fmt.fmt.pix.width       = par->width;
77
    fmt.fmt.pix.height      = par->height;
78
    fmt.fmt.pix.pixelformat = v4l2_pixfmt;
79
    fmt.fmt.pix.sizeimage   = av_image_get_buffer_size(par->format, par->width, par->height, 1);
80
81
    if (ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) {
82
        res = AVERROR(errno);
83
        av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_FMT): %s\n", av_err2str(res));
84
        return res;
85
    }
86
87
    return res;
88
}
89
90
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
91
{
92
    const V4L2Context *s = s1->priv_data;
93
    if (write(s->fd, pkt->data, pkt->size) == -1)
94
        return AVERROR(errno);
95
    return 0;
96
}
97
98
static int write_trailer(AVFormatContext *s1)
99
{
100
    const V4L2Context *s = s1->priv_data;
101
    close(s->fd);
102
    return 0;
103
}
104
105
static const AVClass v4l2_class = {
106
    .class_name = "V4L2 outdev",
107
    .item_name  = av_default_item_name,
108
    .version    = LIBAVUTIL_VERSION_INT,
109
    .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
110
};
111
112
AVOutputFormat ff_v4l2_muxer = {
113
    .name           = "video4linux2,v4l2",
114
    .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux2 output device"),
115
    .priv_data_size = sizeof(V4L2Context),
116
    .audio_codec    = AV_CODEC_ID_NONE,
117
    .video_codec    = AV_CODEC_ID_RAWVIDEO,
118
    .write_header   = write_header,
119
    .write_packet   = write_packet,
120
    .write_trailer  = write_trailer,
121
    .flags          = AVFMT_NOFILE,
122
    .priv_class     = &v4l2_class,
123
};