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Support for the AVFMT_FLAG_NONBLOCK flag (non-blocking input) in v4l2.c 

Originally committed as revision 9496 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Luca Abeni 2007-07-06 07:18:25 +00:00
parent bf09c2e2a6
commit 653387d8f0
1 changed files with 11 additions and 3 deletions
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14
libavformat/v4l2.c
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@ -119,8 +119,12 @@ static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
struct v4l2_capability cap;
int fd;
int res;
int flags = O_RDWR;
fd = open(ctx->filename, O_RDWR /*| O_NONBLOCK*/, 0);
if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
flags |= O_NONBLOCK;
}
fd = open(ctx->filename, flags, 0);
if (fd < 0) {
av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
ctx->filename, strerror(errno));
@ -331,9 +335,13 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
buf.memory = V4L2_MEMORY_MMAP;
/* FIXME: Some special treatment might be needed in case of loss of signal... */
while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 &&
((errno == EAGAIN) || (errno == EINTR)));
while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
if (res < 0) {
if (errno == EAGAIN) {
pkt->size = 0;
return AVERROR(EAGAIN);
}
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
return -1;