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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 | AVCodecContext *enc_ctx; | |
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]->codec->codec_type != AVMEDIA_TYPE_VIDEO || | |
51 | s1->streams[0]->codec->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 | enc_ctx = s1->streams[0]->codec; | |
58 | ||
f6fa7814 | 59 | v4l2_pixfmt = ff_fmt_ff2v4l(enc_ctx->pix_fmt, AV_CODEC_ID_RAWVIDEO); |
2ba45a60 DM |
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(enc_ctx->pix_fmt)); | |
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 = enc_ctx->width; | |
73 | fmt.fmt.pix.height = enc_ctx->height; | |
74 | fmt.fmt.pix.pixelformat = v4l2_pixfmt; | |
75 | fmt.fmt.pix.sizeimage = av_image_get_buffer_size(enc_ctx->pix_fmt, enc_ctx->width, enc_ctx->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 | }; |