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avdevice/v4l2: estimate framerate from dv-timings when VIDIOC_G_PARM returns error.

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rigaya 2023-04-08 09:49:05 +09:00 • committed by nyanmisaka
parent b067f43df6
commit 4d2e94eb6d
1 changed files with 30 additions and 0 deletions
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30
libavdevice/v4l2.c
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@ -810,8 +810,38 @@ static int v4l2_set_parameters(AVFormatContext *ctx)
streamparm.type = (s->multi_planer) ? V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE : V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
// for error cases, try to get frame rate from VIDIOC_G_DV_TIMINGS
struct v4l2_dv_timings timings;
ret = AVERROR(errno);
if (v4l2_ioctl(s->fd, VIDIOC_G_DV_TIMINGS, &timings) == 0) {
const int total_width = timings.bt.width + timings.bt.hfrontporch + timings.bt.hsync + timings.bt.hbackporch;
const int total_height = timings.bt.height + timings.bt.vfrontporch + timings.bt.vsync + timings.bt.vbackporch;
int64_t framerate_den = 1001;
int64_t framerate_num = av_rescale(timings.bt.pixelclock, framerate_den, (int64_t)total_width * total_height);
framerate_num = ((framerate_num + 5) / 10) * 10; // round by 10
if (framerate_num % 1000 == 0) {
tpf->numerator = framerate_den;
tpf->denominator = framerate_num;
} else {
int framerate_num_dst = 0, framerate_den_dst = 0;
framerate_den = 1000;
framerate_num = av_rescale(timings.bt.pixelclock, framerate_den, (int64_t)total_width * total_height);
framerate_num = ((framerate_num + 5) / 10) * 10; // round by 10
av_reduce(&framerate_num_dst, &framerate_den_dst, framerate_num, framerate_den, INT_MAX);
tpf->numerator = framerate_den_dst;
tpf->denominator = framerate_num_dst;
}
av_log(ctx, AV_LOG_WARNING, "ioctl(VIDIOC_G_PARM): %s, estimated framerate %d/%d from dv timings.\n",
av_err2str(ret), tpf->denominator, tpf->numerator);
} else if (framerate_q.num && framerate_q.den) {
// use user defined framerate for further error cases.
tpf->numerator = framerate_q.num;
tpf->denominator = framerate_q.den;
av_log(ctx, AV_LOG_WARNING, "ioctl(VIDIOC_G_PARM): %s, using framerate %d/%d\n",
av_err2str(ret), framerate_q.num, framerate_q.den);
} else {
av_log(ctx, AV_LOG_WARNING, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret));
}
} else if (framerate_q.num && framerate_q.den) {
if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
tpf = &streamparm.parm.capture.timeperframe;