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Code Issues Releases Activity

Replace frame_rate and frame_rate_base fields in VideoData with an

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AVRational time_base field.

Originally committed as revision 16197 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2008-12-17 23:43:56 +00:00
parent 5c3383e5b5
commit 9580ba2676
1 changed files with 8 additions and 13 deletions
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21
libavdevice/v4l.c
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@ -21,6 +21,7 @@
#undef __STRICT_ANSI__ //workaround due to broken kernel headers
#include "config.h"
#include "libavutil/rational.h"
#include "libavformat/avformat.h"
#include "libavcodec/dsputil.h"
#include <unistd.h>
@ -38,8 +39,7 @@ typedef struct {
int frame_format; /* see VIDEO_PALETTE_xxx */
int use_mmap;
int width, height;
int frame_rate;
int frame_rate_base;
AVRational time_base;
int64_t time_frame;
int frame_size;
struct video_capability video_cap;
@ -72,7 +72,6 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
AVStream *st;
int width, height;
int video_fd, frame_size;
int frame_rate, frame_rate_base;
int desired_palette, desired_depth;
struct video_tuner tuner;
struct video_audio audio;
@ -88,11 +87,10 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den);
return -1;
}
s->time_base = ap->time_base;
width = ap->width;
height = ap->height;
frame_rate = ap->time_base.den;
frame_rate_base = ap->time_base.num;
if((unsigned)width > 32767 || (unsigned)height > 32767) {
av_log(s1, AV_LOG_ERROR, "Capture size is out of range: %dx%d\n",
@ -108,8 +106,6 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
s->width = width;
s->height = height;
s->frame_rate = frame_rate;
s->frame_rate_base = frame_rate_base;
video_fd = open(s1->filename, O_RDWR);
if (video_fd < 0) {
@ -197,7 +193,7 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
val = 1;
ioctl(video_fd, VIDIOCCAPTURE, &val);
s->time_frame = av_gettime() * s->frame_rate / s->frame_rate_base;
s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
s->use_mmap = 0;
} else {
s->video_buf = mmap(0,s->gb_buffers.size,PROT_READ|PROT_WRITE,MAP_SHARED,video_fd,0);
@ -209,7 +205,7 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
}
}
s->gb_frame = 0;
s->time_frame = av_gettime() * s->frame_rate / s->frame_rate_base;
s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
/* start to grab the first frame */
s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames;
@ -252,8 +248,7 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
st->codec->codec_id = CODEC_ID_RAWVIDEO;
st->codec->width = width;
st->codec->height = height;
st->codec->time_base.den = frame_rate;
st->codec->time_base.num = frame_rate_base;
st->codec->time_base = s->time_base;
st->codec->bit_rate = frame_size * 1/av_q2d(st->codec->time_base) * 8;
return 0;
@ -301,9 +296,9 @@ static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
/* wait based on the frame rate */
for(;;) {
curtime = av_gettime();
delay = s->time_frame * s->frame_rate_base / s->frame_rate - curtime;
delay = s->time_frame * s->time_base.num / s->time_base.den - curtime;
if (delay <= 0) {
if (delay < INT64_C(-1000000) * s->frame_rate_base / s->frame_rate) {
if (delay < INT64_C(-1000000) * s->time_base.num / s->time_base.den) {
/* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */
s->time_frame += INT64_C(1000000);
}