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avdevice/v4l2: only use average frame rate if set 

It might be unset on some platforms with some drivers and some input

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-02-02 00:11:16 +01:00
parent 4aa4533ee8
commit 0997c2504b
1 changed files with 16 additions and 13 deletions
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29
libavdevice/v4l2.c
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@ -447,18 +447,20 @@ static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
return 0;
}
#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
now = av_gettime_monotonic();
if (s->ts_mode == V4L_TS_MONO2ABS ||
(ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
AVRational tb = {AV_TIME_BASE, 1};
int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate);
av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
/* microseconds instead of seconds, MHz instead of Hz */
s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
if (!s->timefilter)
return AVERROR(ENOMEM);
s->ts_mode = V4L_TS_CONVERT_READY;
return 0;
if (ctx->streams[0]->avg_frame_rate.num) {
now = av_gettime_monotonic();
if (s->ts_mode == V4L_TS_MONO2ABS ||
(ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
AVRational tb = {AV_TIME_BASE, 1};
int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate);
av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
/* microseconds instead of seconds, MHz instead of Hz */
s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
if (!s->timefilter)
return AVERROR(ENOMEM);
s->ts_mode = V4L_TS_CONVERT_READY;
return 0;
}
}
#endif
av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
@ -949,7 +951,8 @@ static int v4l2_read_header(AVFormatContext *s1)
st->codec->codec_tag = MKTAG('Y', 'V', 'U', '9');
st->codec->width = s->width;
st->codec->height = s->height;
st->codec->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
if (st->avg_frame_rate.den)
st->codec->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
return 0;
}