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Implement v4l2 input size autodetection in v4l2_read_header().

Browse Source 
Move check on frame size after the device is opened and after
device_try_init() is attempted. If the provided size value is 0x0,
perform a VIDIOC_G_FMT ioctl() on the device, which sets size to the
current settings.

Originally committed as revision 22971 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2010-04-26 22:07:15 +00:00
parent 687dc3555d
commit 932d775fa2
1 changed files with 18 additions and 8 deletions
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26
libavdevice/v4l2.c
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@ -586,14 +586,6 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
uint32_t desired_format, capabilities;
enum CodecID codec_id;
if (ap->width <= 0 || ap->height <= 0) {
av_log(s1, AV_LOG_ERROR, "Wrong size (%dx%d)\n", ap->width, ap->height);
return AVERROR(EINVAL);
}
if(avcodec_check_dimensions(s1, ap->width, ap->height) < 0)
return AVERROR(EINVAL);
st = av_new_stream(s1, 0);
if (!st) {
return AVERROR(ENOMEM);
@ -610,7 +602,25 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
}
av_log(s1, AV_LOG_INFO, "[%d]Capabilities: %x\n", s->fd, capabilities);
if (!s->width && !s->height) {
struct v4l2_format fmt;
av_log(s1, AV_LOG_INFO, "Size value (%dx%d) unspecified, querying the device for the current settings\n",
s->width, s->height);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", strerror(errno));
return AVERROR(errno);
}
s->width = fmt.fmt.pix.width;
s->height = fmt.fmt.pix.height;
av_log(s1, AV_LOG_INFO, "Setting size to value %dx%d\n", s->width, s->height);
}
desired_format = device_try_init(s1, ap, &s->width, &s->height, &codec_id);
if (avcodec_check_dimensions(s1, s->width, s->height) < 0)
return AVERROR(EINVAL);
if (desired_format == 0) {
av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
"codec_id %d, pix_fmt %d.\n", s1->video_codec_id, ap->pix_fmt);