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v4l2: refactor device_open 

Check capabilities directly in the function, further simplify the code.
This commit is contained in:
Luca Barbato 2011-12-27 06:27:41 +01:00
parent 246007d370
commit eb89b4fc09
1 changed files with 41 additions and 41 deletions
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82
libavdevice/v4l2.c
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@ -100,7 +100,7 @@ static struct fmt_map fmt_conversion_table[] = {
{ PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG },
};
static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
static int device_open(AVFormatContext *ctx)
{
struct v4l2_capability cap;
int fd;
@ -113,41 +113,46 @@ static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
fd = open(ctx->filename, flags, 0);
if (fd < 0) {
err = errno;
av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
ctx->filename, strerror(errno));
return AVERROR(errno);
}
res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
// ENOIOCTLCMD definition only availble on __KERNEL__
if (res < 0 && ((err = errno) == 515)) {
av_log(ctx, AV_LOG_ERROR,
"QUERYCAP not implemented, probably V4L device but "
"not supporting V4L2\n");
close(fd);
return AVERROR(515);
}
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
strerror(errno));
close(fd);
ctx->filename, strerror(err));
return AVERROR(err);
}
if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n");
close(fd);
res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
if (res < 0) {
err = errno;
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
strerror(err));
return AVERROR(ENODEV);
goto fail;
}
*capabilities = cap.capabilities;
av_log(ctx, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n",
fd, cap.capabilities);
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
err = ENODEV;
goto fail;
}
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;
goto fail;
}
return fd;
fail:
close(fd);
return AVERROR(err);
}
static int device_init(AVFormatContext *ctx, int *width, int *height,
@ -600,7 +605,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
struct video_data *s = s1->priv_data;
AVStream *st;
int res = 0;
uint32_t desired_format, capabilities = 0;
uint32_t desired_format;
enum CodecID codec_id;
enum PixelFormat pix_fmt = PIX_FMT_NONE;
@ -610,6 +615,12 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
goto out;
}
s->fd = device_open(s1);
if (s->fd < 0) {
res = s->fd;
goto out;
}
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
if (s->video_size &&
@ -626,13 +637,6 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
goto out;
}
s->fd = device_open(s1, &capabilities);
if (s->fd < 0) {
res = AVERROR(EIO);
goto out;
}
av_log(s1, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n", s->fd, capabilities);
if (!s->width && !s->height) {
struct v4l2_format fmt;
@ -675,16 +679,12 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
s->frame_size =
avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
if (capabilities & V4L2_CAP_STREAMING) {
if (!(res = mmap_init(s1)))
res = mmap_start(s1);
} else {
res = AVERROR(ENOSYS);
}
if (res < 0) {
if ((res = mmap_init(s1)) ||
(res = mmap_start(s1)) < 0) {
close(s->fd);
goto out;
}
s->top_field_first = first_field(s->fd);
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;