Commit graph

11 commits

Author SHA1 Message Date
Romain Vimont
9b056f5091 Replace SDL_net by custom implementation
SDL_net is not very suitable for scrcpy.

For example, SDLNet_TCP_Accept() is non-blocking, so we have to wrap it
by calling many SDL_Net-specific functions to make it blocking.

But above all, SDLNet_TCP_Open() is a server socket only when no IP is
provided; otherwise, it's a client socket. Therefore, it is not possible
to create a server socket bound to localhost, so it accepts connections
from anywhere.

This is a problem for scrcpy, because on start, the application listens
for nearly 1 second until it accepts the first connection, supposedly
from the device. If someone on the local network manages to connect to
the server socket first, then they can stream arbitrary H.264 video.
This may be troublesome, for example during a public presentation ;-)

Provide our own simplified API (net.h) instead, implemented for the
different platforms.
2018-02-16 00:56:58 +01:00
Romain Vimont
eb09fefd43 Timeout the server socket connection
Wait no more than 2 seconds for accepting the connection from the
device, since it blocks the event loop, preventing to react to SIGTERM
(Ctrl+C).
2018-02-09 16:21:10 +01:00
Romain Vimont
4662198261 Do not release TCP sockets while still in use
SDLNet_TCP_Close() not only closes, but also release the resources.

Therefore, we must not close the socket if another thread attempts to
read it.

For that purpose, move socket closing from server_stop() to
server_destroy().
2018-02-09 12:59:36 +01:00
Romain Vimont
e1749a0c09 Remove the "adb reverse" tunnel immediately
As soon as we accepted a connection, we can remove the "adb reverse"
tunnel.
2018-02-08 17:40:09 +01:00
Romain Vimont
28c5cc030b Move server-related code to server.c
The file server.c already existed, but exposed a low-level API. Make it
higher-level, so that scrcpy.c does not handle server details directly.
2018-02-08 17:40:09 +01:00
Romain Vimont
14c58546a7 Add missing include guards
In practice, these headers are included only once, but it's a good
practice to always use include guards.
2018-02-08 15:26:08 +01:00
Romain Vimont
6b546a87ab Add bit-rate command-line option
Add a command-line option (-b/--bit-rate) to customize the video
bit-rate.
2018-02-01 17:11:40 +01:00
Romain Vimont
ee93f3f23a Rename maximum_size to max_size
The long option is --max-size, so for consistency, adapt the code
accordingly.
2018-02-01 17:11:40 +01:00
Romain Vimont
89f6a3cfe7 Handle resized video stream
Accept a parameter to limit the video size.

For instance, with "-m 960", the great side of the video will be scaled
down to 960 (if necessary), while the other side will be scaled down so
that the aspect ratio is preserved. Both dimensions must be a multiple
of 8, so black bands might be added, and the mouse positions must be
computed accordingly.
2018-01-29 15:40:33 +01:00
Romain Vimont
d7b00a9bab Move server-related functions to server.c
In addition to the functions to start/stop the server, move the
functions to push the jar and enable/disable the "adb reverse" tunnel.
2018-01-23 16:20:03 +01:00
Romain Vimont
7d67696b7e Extract server-related functions
To lighten screen.c, move start_server() and stop_server() to a separate
file.
2018-01-22 11:29:44 +01:00