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v4l2: Preserve errno values

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av_log usually resets it.
This commit is contained in:
Luca Barbato 2014-11-06 09:58:03 +01:00
parent a1a259881f
commit 09f25533a5
1 changed files with 23 additions and 16 deletions
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39
libavdevice/v4l2.c
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@ -138,8 +138,8 @@ static int device_open(AVFormatContext *ctx)
res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
if (res < 0) {
err = errno;
av_strerror(AVERROR(err), errbuf, sizeof(errbuf));
err = AVERROR(errno);
av_strerror(err, errbuf, sizeof(errbuf));
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
errbuf);
@ -151,7 +151,7 @@ static int device_open(AVFormatContext *ctx)
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
err = ENODEV;
err = AVERROR(ENODEV);
goto fail;
}
@ -159,7 +159,7 @@ static int device_open(AVFormatContext *ctx)
if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
av_log(ctx, AV_LOG_ERROR,
"The device does not support the streaming I/O method.\n");
err = ENOSYS;
err = AVERROR(ENOSYS);
goto fail;
}
@ -168,7 +168,7 @@ static int device_open(AVFormatContext *ctx)
fail:
close(fd);
return AVERROR(err);
return err;
}
static int device_init(AVFormatContext *ctx, int *width, int *height,
@ -348,13 +348,14 @@ static int mmap_init(AVFormatContext *ctx)
res = ioctl(s->fd, VIDIOC_REQBUFS, &req);
if (res < 0) {
res = errno;
if (errno == EINVAL) {
av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
} else {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
}
return AVERROR(errno);
return AVERROR(res);
}
if (req.count < 2) {
@ -386,9 +387,10 @@ static int mmap_init(AVFormatContext *ctx)
res = ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
if (res < 0) {
res = AVERROR(errno);
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
return AVERROR(errno);
return res;
}
s->buf_len[i] = buf.length;
@ -405,10 +407,11 @@ static int mmap_init(AVFormatContext *ctx)
if (s->buf_start[i] == MAP_FAILED) {
char errbuf[128];
av_strerror(AVERROR(errno), errbuf, sizeof(errbuf));
res = AVERROR(errno);
av_strerror(res, errbuf, sizeof(errbuf));
av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", errbuf);
return AVERROR(errno);
return res;
}
}
@ -471,11 +474,12 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
return AVERROR(EAGAIN);
}
av_strerror(AVERROR(errno), errbuf, sizeof(errbuf));
res = AVERROR(errno);
av_strerror(res, errbuf, sizeof(errbuf));
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
errbuf);
return AVERROR(errno);
return res;
}
if (buf.index >= s->buffers) {
@ -506,9 +510,10 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
res = ioctl(s->fd, VIDIOC_QBUF, &buf);
if (res < 0) {
res = AVERROR(errno);
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
av_free_packet(pkt);
return AVERROR(errno);
return res;
}
avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
} else {
@ -693,10 +698,11 @@ static int v4l2_set_parameters(AVFormatContext *s1)
} else {
if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
char errbuf[128];
av_strerror(AVERROR(errno), errbuf, sizeof(errbuf));
ret = AVERROR(errno);
av_strerror(ret, errbuf, sizeof(errbuf));
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
errbuf);
return AVERROR(errno);
return ret;
}
}
s1->streams[0]->avg_frame_rate.num = tpf->denominator;
@ -797,10 +803,11 @@ static int v4l2_read_header(AVFormatContext *s1)
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
char errbuf[128];
av_strerror(AVERROR(errno), errbuf, sizeof(errbuf));
res = AVERROR(errno);
av_strerror(res, errbuf, sizeof(errbuf));
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
errbuf);
return AVERROR(errno);
return res;
}
s->width = fmt.fmt.pix.width;