| 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 |