On Wed, 2017-06-14 at 16:40 +0100, Frediano Ziglio wrote:
> The channel needs to communicate when it receive a new
> stream request from the guest.
I find it pretty odd to have a patch that introduces a callback that
can be registered without the callback ever being executed. It makes it
hard to know exactly how it's supposed to be used. Maybe this could be
combined with a later commit?
>
> Signed-off-by: Frediano Ziglio <fzig...@redhat.com>
> ---
> server/stream-channel.c | 12 ++++++++++++
> server/stream-channel.h | 6 ++++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/server/stream-channel.c b/server/stream-channel.c
> index 698a740..ae44f59 100644
> --- a/server/stream-channel.c
> +++ b/server/stream-channel.c
> @@ -67,6 +67,10 @@ struct StreamChannel {
> int stream_id;
> /* size of the current video stream */
> unsigned width, height;
> +
> + /* callback to notify when a stream should be started or stopped
> */
> + stream_channel_start_proc start_cb;
> + void *start_opaque;
> };
>
> struct StreamChannelClass {
> @@ -379,3 +383,11 @@ stream_channel_send_data(StreamChannel *channel,
> const void *data, size_t size)
> red_channel_pipes_new_add(red_channel, pipe_item_new_ref, item);
> red_pipe_item_unref(&item->base);
> }
> +
> +void
> +stream_channel_register_start_cb(StreamChannel *channel,
> + stream_channel_start_proc cb, void
> *opaque)
> +{
> + channel->start_cb = cb;
> + channel->start_opaque = opaque;
> +}
For completeness, it would probably be good to include a 'free'
function for the opaque variable, but presumably for your use case,
none is needed.
> diff --git a/server/stream-channel.h b/server/stream-channel.h
> index b771082..d48c3c8 100644
> --- a/server/stream-channel.h
> +++ b/server/stream-channel.h
> @@ -49,11 +49,17 @@ GType stream_channel_get_type(void) G_GNUC_CONST;
> StreamChannel* stream_channel_new(RedsState *server);
>
> struct StreamMsgFormat;
> +struct StreamMsgStartStop;
>
> void stream_channel_change_format(StreamChannel *channel,
> const struct StreamMsgFormat
> *fmt);
> void stream_channel_send_data(StreamChannel *channel, const void
> *data, size_t size);
>
> +typedef void (*stream_channel_start_proc)(void *opaque, struct
> StreamMsgStartStop *start,
> + StreamChannel *channel);
> +void stream_channel_register_start_cb(StreamChannel *channel,
> + stream_channel_start_proc cb,
> void *opaque);
> +
> G_END_DECLS
>
> #endif /* STREAM_CHANNEL_H_ */
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