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Implement size autodetection if one of the width and height

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AVFormatParameters for grab_read_header() is non-positive.

Originally committed as revision 16199 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2008-12-17 23:58:28 +00:00
parent 406c580854
commit 7bbacf9a0c
1 changed files with 8 additions and 4 deletions
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12
libavdevice/v4l.c
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@ -78,10 +78,6 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
int j;
int vformat_num = FF_ARRAY_ELEMS(video_formats);
if (ap->width <= 0 || ap->height <= 0) {
av_log(s1, AV_LOG_ERROR, "Wrong size (%dx%d)\n", ap->width, ap->height);
return -1;
}
if (ap->time_base.den <= 0) {
av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den);
return -1;
@ -107,6 +103,14 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
goto fail;
}
/* no values set, autodetect them */
if (s->video_win.width <= 0 || s->video_win.height <= 0) {
if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) {
av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno));
goto fail;
}
}
if (ioctl(video_fd,VIDIOCGCAP, &s->video_cap) < 0) {
av_log(s1, AV_LOG_ERROR, "VIDIOCGCAP: %s\n", strerror(errno));
goto fail;