FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavdevice/v4l2enc.c
Date: 2024-04-19 07:31:02
Exec Total Coverage
Lines: 0 45 0.0%
Functions: 0 3 0.0%
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 "libavutil/imgutils.h"
22 #include "libavutil/pixdesc.h"
23 #include "libavformat/avformat.h"
24 #include "libavformat/mux.h"
25 #include "v4l2-common.h"
26
27 typedef struct {
28 AVClass *class;
29 int fd;
30 } V4L2Context;
31
32 static av_cold int write_header(AVFormatContext *s1)
33 {
34 int res = 0, flags = O_RDWR;
35 struct v4l2_format fmt = {
36 .type = V4L2_BUF_TYPE_VIDEO_OUTPUT
37 };
38 V4L2Context *s = s1->priv_data;
39 AVCodecParameters *par;
40 uint32_t v4l2_pixfmt;
41
42 if (s1->flags & AVFMT_FLAG_NONBLOCK)
43 flags |= O_NONBLOCK;
44
45 s->fd = open(s1->url, flags);
46 if (s->fd < 0) {
47 res = AVERROR(errno);
48 av_log(s1, AV_LOG_ERROR, "Unable to open V4L2 device '%s'\n", s1->url);
49 return res;
50 }
51
52 if (s1->nb_streams != 1 ||
53 s1->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
54 av_log(s1, AV_LOG_ERROR,
55 "V4L2 output device supports only a single raw video stream\n");
56 return AVERROR(EINVAL);
57 }
58
59 par = s1->streams[0]->codecpar;
60
61 if(par->codec_id == AV_CODEC_ID_RAWVIDEO) {
62 v4l2_pixfmt = ff_fmt_ff2v4l(par->format, AV_CODEC_ID_RAWVIDEO);
63 } else {
64 v4l2_pixfmt = ff_fmt_ff2v4l(AV_PIX_FMT_NONE, par->codec_id);
65 }
66
67 if (!v4l2_pixfmt) { // XXX: try to force them one by one?
68 av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for %s\n",
69 av_get_pix_fmt_name(par->format));
70 return AVERROR(EINVAL);
71 }
72
73 if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
74 res = AVERROR(errno);
75 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res));
76 return res;
77 }
78
79 fmt.fmt.pix.width = par->width;
80 fmt.fmt.pix.height = par->height;
81 fmt.fmt.pix.pixelformat = v4l2_pixfmt;
82 fmt.fmt.pix.sizeimage = av_image_get_buffer_size(par->format, par->width, par->height, 1);
83
84 if (ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) {
85 res = AVERROR(errno);
86 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_FMT): %s\n", av_err2str(res));
87 return res;
88 }
89
90 return res;
91 }
92
93 static int write_packet(AVFormatContext *s1, AVPacket *pkt)
94 {
95 const V4L2Context *s = s1->priv_data;
96 if (write(s->fd, pkt->data, pkt->size) == -1)
97 return AVERROR(errno);
98 return 0;
99 }
100
101 static int write_trailer(AVFormatContext *s1)
102 {
103 const V4L2Context *s = s1->priv_data;
104 close(s->fd);
105 return 0;
106 }
107
108 static const AVClass v4l2_class = {
109 .class_name = "V4L2 outdev",
110 .item_name = av_default_item_name,
111 .version = LIBAVUTIL_VERSION_INT,
112 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
113 };
114
115 const FFOutputFormat ff_v4l2_muxer = {
116 .p.name = "video4linux2,v4l2",
117 .p.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 output device"),
118 .priv_data_size = sizeof(V4L2Context),
119 .p.audio_codec = AV_CODEC_ID_NONE,
120 .p.video_codec = AV_CODEC_ID_RAWVIDEO,
121 .write_header = write_header,
122 .write_packet = write_packet,
123 .write_trailer = write_trailer,
124 .p.flags = AVFMT_NOFILE,
125 .p.priv_class = &v4l2_class,
126 };
127