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Add support for drivers that can change the capture size on VIDIOC_S_FMT

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Originally committed as revision 5076 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Luca Abeni 2006-02-28 11:28:09 +00:00
parent 2b63c22255
commit 24300af416
1 changed files with 14 additions and 6 deletions
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20
libavformat/v4l2.c
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@ -148,17 +148,25 @@ static int device_open(const char *devname, uint32_t *capabilities)
return fd;
}
static int device_init(int fd, int width, int height, int pix_fmt)
static int device_init(int fd, int *width, int *height, int pix_fmt)
{
struct v4l2_format fmt;
int res;
memset(&fmt, 0, sizeof(struct v4l2_format));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = width;
fmt.fmt.pix.height = height;
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pix_fmt;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
return ioctl (fd, VIDIOC_S_FMT, &fmt);
res = ioctl(fd, VIDIOC_S_FMT, &fmt);
if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
av_log(NULL, AV_LOG_INFO, "The V4L2 driver changed the video from %dx%d to %dx%d\n", *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
*width = fmt.fmt.pix.width;
*height = fmt.fmt.pix.height;
}
return res;
}
static int first_field(int fd)
@ -418,13 +426,13 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
av_log(s1, AV_LOG_ERROR, "[%d]Capabilities: %x\n", s->fd, capabilities);
desired_format = fmt_ff2v4l(ap->pix_fmt);
if (desired_format == 0 || (device_init(s->fd, width, height, desired_format) < 0)) {
if (desired_format == 0 || (device_init(s->fd, &width, &height, desired_format) < 0)) {
int i, done;
done = 0; i = 0;
while (!done) {
desired_format = fmt_conversion_table[i].v4l2_fmt;
if (device_init(s->fd, width, height, desired_format) < 0) {
if (device_init(s->fd, &width, &height, desired_format) < 0) {
desired_format = 0;
i++;
} else {