blob: faf6e07f8679671d8b9264bd699149c2eff98d14
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->filename, 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->filename); |
46 | return res; |
47 | } |
48 | |
49 | if (s1->nb_streams != 1 || |
50 | s1->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO || |
51 | s1->streams[0]->codecpar->codec_id != AV_CODEC_ID_RAWVIDEO) { |
52 | av_log(s1, AV_LOG_ERROR, |
53 | "V4L2 output device supports only a single raw video stream\n"); |
54 | return AVERROR(EINVAL); |
55 | } |
56 | |
57 | par = s1->streams[0]->codecpar; |
58 | |
59 | v4l2_pixfmt = ff_fmt_ff2v4l(par->format, AV_CODEC_ID_RAWVIDEO); |
60 | if (!v4l2_pixfmt) { // XXX: try to force them one by one? |
61 | av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for %s\n", |
62 | av_get_pix_fmt_name(par->format)); |
63 | return AVERROR(EINVAL); |
64 | } |
65 | |
66 | if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { |
67 | res = AVERROR(errno); |
68 | av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res)); |
69 | return res; |
70 | } |
71 | |
72 | fmt.fmt.pix.width = par->width; |
73 | fmt.fmt.pix.height = par->height; |
74 | fmt.fmt.pix.pixelformat = v4l2_pixfmt; |
75 | fmt.fmt.pix.sizeimage = av_image_get_buffer_size(par->format, par->width, par->height, 1); |
76 | |
77 | if (ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) { |
78 | res = AVERROR(errno); |
79 | av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_FMT): %s\n", av_err2str(res)); |
80 | return res; |
81 | } |
82 | |
83 | return res; |
84 | } |
85 | |
86 | static int write_packet(AVFormatContext *s1, AVPacket *pkt) |
87 | { |
88 | const V4L2Context *s = s1->priv_data; |
89 | if (write(s->fd, pkt->data, pkt->size) == -1) |
90 | return AVERROR(errno); |
91 | return 0; |
92 | } |
93 | |
94 | static int write_trailer(AVFormatContext *s1) |
95 | { |
96 | const V4L2Context *s = s1->priv_data; |
97 | close(s->fd); |
98 | return 0; |
99 | } |
100 | |
101 | static const AVClass v4l2_class = { |
102 | .class_name = "V4L2 outdev", |
103 | .item_name = av_default_item_name, |
104 | .version = LIBAVUTIL_VERSION_INT, |
105 | .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, |
106 | }; |
107 | |
108 | AVOutputFormat ff_v4l2_muxer = { |
109 | .name = "v4l2", |
110 | .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 output device"), |
111 | .priv_data_size = sizeof(V4L2Context), |
112 | .audio_codec = AV_CODEC_ID_NONE, |
113 | .video_codec = AV_CODEC_ID_RAWVIDEO, |
114 | .write_header = write_header, |
115 | .write_packet = write_packet, |
116 | .write_trailer = write_trailer, |
117 | .flags = AVFMT_NOFILE, |
118 | .priv_class = &v4l2_class, |
119 | }; |
120 |