| /* |
| * Copyright (c) 2013 Clément Bœsch |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "v4l2-common.h" |
| #include "avdevice.h" |
| |
| typedef struct { |
| AVClass *class; |
| int fd; |
| } V4L2Context; |
| |
| static av_cold int write_header(AVFormatContext *s1) |
| { |
| int res = 0, flags = O_RDWR; |
| struct v4l2_format fmt = { |
| .type = V4L2_BUF_TYPE_VIDEO_OUTPUT |
| }; |
| V4L2Context *s = s1->priv_data; |
| AVCodecContext *enc_ctx; |
| uint32_t v4l2_pixfmt; |
| |
| if (s1->flags & AVFMT_FLAG_NONBLOCK) |
| flags |= O_NONBLOCK; |
| |
| s->fd = open(s1->filename, flags); |
| if (s->fd < 0) { |
| res = AVERROR(errno); |
| av_log(s1, AV_LOG_ERROR, "Unable to open V4L2 device '%s'\n", s1->filename); |
| return res; |
| } |
| |
| if (s1->nb_streams != 1 || |
| s1->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO || |
| s1->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) { |
| av_log(s1, AV_LOG_ERROR, |
| "V4L2 output device supports only a single raw video stream\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| enc_ctx = s1->streams[0]->codec; |
| |
| v4l2_pixfmt = avpriv_fmt_ff2v4l(enc_ctx->pix_fmt, AV_CODEC_ID_RAWVIDEO); |
| if (!v4l2_pixfmt) { // XXX: try to force them one by one? |
| av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for %s\n", |
| av_get_pix_fmt_name(enc_ctx->pix_fmt)); |
| return AVERROR(EINVAL); |
| } |
| |
| if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { |
| res = AVERROR(errno); |
| av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res)); |
| return res; |
| } |
| |
| fmt.fmt.pix.width = enc_ctx->width; |
| fmt.fmt.pix.height = enc_ctx->height; |
| fmt.fmt.pix.pixelformat = v4l2_pixfmt; |
| fmt.fmt.pix.sizeimage = av_image_get_buffer_size(enc_ctx->pix_fmt, enc_ctx->width, enc_ctx->height, 1); |
| |
| if (ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) { |
| res = AVERROR(errno); |
| av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_FMT): %s\n", av_err2str(res)); |
| return res; |
| } |
| |
| return res; |
| } |
| |
| static int write_packet(AVFormatContext *s1, AVPacket *pkt) |
| { |
| const V4L2Context *s = s1->priv_data; |
| if (write(s->fd, pkt->data, pkt->size) == -1) |
| return AVERROR(errno); |
| return 0; |
| } |
| |
| static int write_trailer(AVFormatContext *s1) |
| { |
| const V4L2Context *s = s1->priv_data; |
| close(s->fd); |
| return 0; |
| } |
| |
| static const AVClass v4l2_class = { |
| .class_name = "V4L2 outdev", |
| .item_name = av_default_item_name, |
| .version = LIBAVUTIL_VERSION_INT, |
| .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, |
| }; |
| |
| AVOutputFormat ff_v4l2_muxer = { |
| .name = "v4l2", |
| .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 output device"), |
| .priv_data_size = sizeof(V4L2Context), |
| .audio_codec = AV_CODEC_ID_NONE, |
| .video_codec = AV_CODEC_ID_RAWVIDEO, |
| .write_header = write_header, |
| .write_packet = write_packet, |
| .write_trailer = write_trailer, |
| .flags = AVFMT_NOFILE, |
| .priv_class = &v4l2_class, |
| }; |