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v4l2: factorize returning error codes. 

This will be useful in the following commit.
This commit is contained in:
Anton Khirnov 2011-05-26 20:37:08 +02:00
parent fd48620e3e
commit 82b5aa0add
1 changed files with 17 additions and 11 deletions
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28
libavdevice/v4l2.c
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@ -577,13 +577,14 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
struct video_data *s = s1->priv_data;
AVStream *st;
int res;
int res = 0;
uint32_t desired_format, capabilities;
enum CodecID codec_id;
st = av_new_stream(s1, 0);
if (!st) {
return AVERROR(ENOMEM);
res = AVERROR(ENOMEM);
goto out;
}
av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
@ -593,7 +594,8 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
capabilities = 0;
s->fd = device_open(s1, &capabilities);
if (s->fd < 0) {
return AVERROR(EIO);
res = AVERROR(EIO);
goto out;
}
av_log(s1, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n", s->fd, capabilities);
@ -604,7 +606,8 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", strerror(errno));
return AVERROR(errno);
res = AVERROR(errno);
goto out;
}
s->width = fmt.fmt.pix.width;
s->height = fmt.fmt.pix.height;
@ -617,14 +620,15 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
"codec_id %d, pix_fmt %d.\n", s1->video_codec_id, ap->pix_fmt);
close(s->fd);
return AVERROR(EIO);
res = AVERROR(EIO);
goto out;
}
if (av_image_check_size(s->width, s->height, 0, s1) < 0)
return AVERROR(EINVAL);
if ((res = av_image_check_size(s->width, s->height, 0, s1) < 0))
goto out;
s->frame_format = desired_format;
if (v4l2_set_parameters(s1, ap) < 0)
return AVERROR(EIO);
if ((res = v4l2_set_parameters(s1, ap) < 0))
goto out;
st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
s->frame_size = avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
@ -641,7 +645,8 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
if (res < 0) {
close(s->fd);
return AVERROR(EIO);
res = AVERROR(EIO);
goto out;
}
s->top_field_first = first_field(s->fd);
@ -653,7 +658,8 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
st->codec->time_base.num = ap->time_base.num;
st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
return 0;
out:
return res;
}
static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)