| 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 |
nothing calls this directly
no test coverage detected