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v4l2: setting device parameters early 

Setting the v4l2 device parameters may influence video properties
such as width, height and pixel format.
This patch moves v4l2_set_parameters to be executed before fetching
the video properties, avoiding errors such as (pal vs ntsc):

 The v4l2 frame is 829440 bytes, but 691200 bytes are expected

Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Federico Simoncelli 2014-01-02 16:25:48 +01:00 committed by Michael Niedermayer
parent 05286b6a9c
commit b1ad931233
1 changed files with 3 additions and 3 deletions
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6
libavdevice/v4l2.c
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@ -866,6 +866,9 @@ static int v4l2_read_header(AVFormatContext *s1)
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
if ((res = v4l2_set_parameters(s1)) < 0)
return res;
if (s->pixel_format) {
AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
@ -917,9 +920,6 @@ static int v4l2_read_header(AVFormatContext *s1)
s->frame_format = desired_format;
if ((res = v4l2_set_parameters(s1)) < 0)
return res;
st->codec->pix_fmt = avpriv_fmt_v4l2ff(desired_format, codec_id);
s->frame_size =
avpicture_get_size(st->codec->pix_fmt, s->width, s->height);