static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) { struct video_data *s = s1->priv_data; struct v4l2_input input; struct v4l2_standard standard; struct v4l2_streamparm streamparm = { 0 }; struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe; int i, ret; AVRational framerate_q; streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (s->framerate && (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) { av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate); return ret; } /* set tv video input */ memset (&input, 0, sizeof (input)); input.index = s->channel; if (ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) { av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n"); return AVERROR(EIO); } av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n", s->channel, input.name); if (ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) { av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n", s->channel); return AVERROR(EIO); } if (s->standard) { av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n", s->standard); /* set tv standard */ memset (&standard, 0, sizeof (standard)); for(i=0;;i++) { standard.index = i; if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n", s->standard); return AVERROR(EIO); } if (!av_strcasecmp(standard.name, s->standard)) { break; } } av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n", s->standard, (uint64_t)standard.id); if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) { av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n", s->standard); return AVERROR(EIO); } } if (framerate_q.num && framerate_q.den) { av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n", framerate_q.den, framerate_q.num); tpf->numerator = framerate_q.den; tpf->denominator = framerate_q.num; if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) { av_log(s1, AV_LOG_ERROR, "ioctl set time per frame(%d/%d) failed\n", framerate_q.den, framerate_q.num); return AVERROR(EIO); } if (framerate_q.num != tpf->denominator || framerate_q.den != tpf->numerator) { av_log(s1, AV_LOG_INFO, "The driver changed the time per frame from " "%d/%d to %d/%d\n", framerate_q.den, framerate_q.num, tpf->numerator, tpf->denominator); } } else { if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) { av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", strerror(errno)); return AVERROR(errno); } } s1->streams[0]->codec->time_base.den = tpf->denominator; s1->streams[0]->codec->time_base.num = tpf->numerator; s->timeout = 100 + av_rescale_q(1, s1->streams[0]->codec->time_base, (AVRational){1, 1000}); return 0; }