Hi Dafna,
On 7/1/19 12:30 PM, Dafna Hirschfeld wrote:
> commit 84219e2b5d013709ee5259621715966c46eec746
> Author: Hans Verkuil <[email protected]>
> Date: Sat Mar 30 14:16:25 2019 +0100
>
> v4l2-ctl: get fmt after source change
>
> When a source change event arrives during decoding get the new
> format at that point instead of after restarting streaming.
>
> If there is another source change queued up, then when you call
> streamon for CAPTURE again it might send the new source change
> event and update the format for that one, so reading the format
> after streamon might give the wrong format.
>
> Signed-off-by: Hans Verkuil <[email protected]>
>
> diff --git a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
> b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
> index bb656584..3695a027 100644
> --- a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
> +++ b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
> @@ -2363,12 +2363,11 @@ static void stateful_m2m(cv4l_fd &fd,
> cv4l_queue &in, cv4l_queue &out,
> if (in_source_change_event) {
> in_source_change_event = false;
> last_buffer = false;
> + fd.g_fmt(fmt_in, in.g_type());
> if (capture_setup(fd, in, exp_fd_p))
> return;
> fps_ts[CAP].reset();
> fps_ts[OUT].reset();
> - fd.g_fmt(fmt_out, out.g_type());
> - fd.g_fmt(fmt_in, in.g_type());
> Removing those lines cause inconsistency when the user send the wanted
> capture pixel format when decoding with the `v4l2-ctl` command. In
> this case the value of `-v pixelformat=...` is updated in the kernel
> with the capture_setup function but it is not updated in the fmt_in
> variable and so the command will try to save the decoded video in a
> different format from what is configured in the kernel.
>
> cap_streaming = true;
> } else {
> break;
>
>
> Dafna
>
It looks like you are right. Can you try this v4l2-ctl patch?
Regards,
Hans
[PATCH] v4l2-ctl: let capture_setup return the updated format
Just getting the new format after a source change event isn't
enough in the case that -v option was specified by the user.
Instead let capture_setup optionally return the new format after
any '-v' changes are applied.
Signed-off-by: Hans Verkuil <[email protected]>
Reported-by: Dafna Hirschfeld <[email protected]>
---
diff --git a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
index 28b2b3b9..470fa766 100644
--- a/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
+++ b/utils/v4l2-ctl/v4l2-ctl-streaming.cpp
@@ -2146,7 +2146,7 @@ enum stream_type {
OUT,
};
-static int capture_setup(cv4l_fd &fd, cv4l_queue &in, cv4l_fd *exp_fd)
+static int capture_setup(cv4l_fd &fd, cv4l_queue &in, cv4l_fd *exp_fd,
cv4l_fmt *new_fmt = NULL)
{
if (fd.streamoff(in.g_type())) {
fprintf(stderr, "%s: fd.streamoff error\n", __func__);
@@ -2168,6 +2168,10 @@ static int capture_setup(cv4l_fd &fd, cv4l_queue &in,
cv4l_fd *exp_fd)
return -1;
}
fd.s_fmt(fmt, in.g_type());
+ if (new_fmt)
+ *new_fmt = fmt;
+ } else if (new_fmt) {
+ fd.g_fmt(*new_fmt, in.g_type());
}
get_cap_compose_rect(fd);
@@ -2367,8 +2371,7 @@ static void stateful_m2m(cv4l_fd &fd, cv4l_queue &in,
cv4l_queue &out,
if (in_source_change_event) {
in_source_change_event = false;
last_buffer = false;
- fd.g_fmt(fmt_in, in.g_type());
- if (capture_setup(fd, in, exp_fd_p))
+ if (capture_setup(fd, in, exp_fd_p, &fmt_in))
return;
fps_ts[CAP].reset();
fps_ts[OUT].reset();
