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Fix the 'hard cpu loop' problem when capturing audio from /dev/dsp. This 

code now waits for up to 30ms before reporting that no packet is available.

Originally committed as revision 1546 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Philip Gladstone 2003-02-05 01:59:52 +00:00
parent 85a57296cc
commit 79134973d8
1 changed files with 12 additions and 0 deletions
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12
libavformat/audio.c
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@ -244,6 +244,18 @@ static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
if (av_new_packet(pkt, s->frame_size) < 0) if (av_new_packet(pkt, s->frame_size) < 0)
return -EIO; return -EIO;
for(;;) { for(;;) {
struct timeval tv;
fd_set fds;
tv.tv_sec = 0;
tv.tv_usec = 30 * 1000; /* 30 msecs -- a bit shorter than 1 frame at 30fps */
FD_ZERO(&fds);
FD_SET(s->fd, &fds);
/* This will block until data is available or we get a timeout */
(void) select(s->fd + 1, &fds, 0, 0, &tv);
ret = read(s->fd, pkt->data, pkt->size); ret = read(s->fd, pkt->data, pkt->size);
if (ret > 0) if (ret > 0)
break; break;