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Fix division by zero in tvi_v4l2 which occures when capture device

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driver (such as uvcvideo USB video driver) does not provide VIDIOC_G_STD ioctl.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@27170 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
voroshil 2008-06-30 17:42:35 +00:00
parent 61d2b20de1
commit fddbd84992
1 changed files with 18 additions and 8 deletions
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26
stream/tvi_v4l2.c
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@ -336,13 +336,23 @@ static int amode2v4l(int amode)
}
/*
** Get current FPS.
*/
static double getfps(priv_t *priv)
{
if (priv->tv_param->fps > 0)
return priv->tv_param->fps;
if (priv->standard.frameperiod.denominator && priv->standard.frameperiod.numerator)
return (double)priv->standard.frameperiod.denominator / priv->standard.frameperiod.numerator;
return 25.0;
}
// sets and sanitizes audio buffer/block sizes
static void setup_audio_buffer_sizes(priv_t *priv)
{
int bytes_per_sample = priv->audio_in.bytes_per_sample;
double fps = (double)priv->standard.frameperiod.denominator /
priv->standard.frameperiod.numerator;
int seconds = priv->video_buffer_size_max/fps;
int seconds = priv->video_buffer_size_max/getfps(priv);
if (seconds < 5) seconds = 5;
if (seconds > 500) seconds = 500;
@ -701,6 +711,10 @@ static int control(priv_t *priv, int cmd, void *arg)
priv->immediate_mode = 1;
return TVI_CONTROL_TRUE;
case TVI_CONTROL_VID_GET_FPS:
if (!priv->standard.frameperiod.denominator || !priv->standard.frameperiod.numerator) {
mp_msg(MSGT_TV, MSGL_ERR, "%s: Cannot get fps\n", info.short_name);
return TVI_CONTROL_FALSE;
}
*(float *)arg = (float)priv->standard.frameperiod.denominator /
priv->standard.frameperiod.numerator;
mp_msg(MSGT_TV, MSGL_V, "%s: get fps: %f\n", info.short_name,
@ -1089,11 +1103,7 @@ static int uninit(priv_t *priv)
struct v4l2_buffer buf;
/* get performance */
frames = 1 + (priv->curr_frame - priv->first_frame +
priv->standard.frameperiod.numerator * 500000 /
priv->standard.frameperiod.denominator) *
priv->standard.frameperiod.denominator /
priv->standard.frameperiod.numerator / 1000000;
frames = 1 + lrintf((double)(priv->curr_frame - priv->first_frame) / (1e6 * getfps(priv)));
dropped = frames - priv->frames;
/* turn off streaming */