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Allow setting v4l2 input and video standard.

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Patch by Limin Wang (lance.lmwang AT gmail DOT com)

Originally committed as revision 8542 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Limin Wang 2007-03-29 06:32:54 +00:00 committed by Luca Abeni
parent 4992d8bf7d
commit f5ad81f527
1 changed files with 54 additions and 0 deletions
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54
libavformat/v4l2.c
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@ -422,6 +422,57 @@ static void mmap_close(struct video_data *s)
av_free(s->buf_len);
}
static int v4l2_set_parameters( AVFormatContext *s1, AVFormatParameters *ap )
{
struct video_data *s = s1->priv_data;
struct v4l2_input input;
struct v4l2_standard standard;
int i;
/* set tv video input */
memset (&input, 0, sizeof (input));
input.index = ap->channel;
if(ioctl (s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
return AVERROR_IO;
}
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
ap->channel, input.name);
if(ioctl (s->fd, VIDIOC_S_INPUT, &input.index) < 0 ) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n",
ap->channel);
return AVERROR_IO;
}
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
ap->standard );
/* set tv standard */
memset (&standard, 0, sizeof (standard));
for(i=0;;i++) {
standard.index = i;
if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
ap->standard);
return AVERROR_IO;
}
if(!strcasecmp(standard.name, ap->standard)) {
break;
}
}
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
ap->standard, standard.id);
if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
ap->standard);
return AVERROR_IO;
}
return 0;
}
static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
struct video_data *s = s1->priv_data;
@ -494,6 +545,9 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
}
s->frame_format = desired_format;
if( v4l2_set_parameters( s1, ap ) < 0 )
return AVERROR_IO;
st->codec->pix_fmt = fmt_v4l2ff(desired_format);
s->frame_size = avpicture_get_size(st->codec->pix_fmt, width, height);
if (capabilities & V4L2_CAP_STREAMING) {