[Ffmpeg-devel] [PATCH] support v4l2 video source and normid input
Limin Wang
lance.lmwang
Sat Mar 24 05:25:49 CET 2007
Hi,
Please apply this patch if it's OK, the last patch has one debug typo error.
Thanks,
Limin
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Index: libavformat/v4l2.c
===================================================================
--- libavformat/v4l2.c (revision 8491)
+++ libavformat/v4l2.c (working copy)
@@ -422,6 +422,57 @@
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: %d\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 @@
}
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) {
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