Add option to select USB or TCP/IP devices

If several devices are connected (as listed by `adb devices`), it was
necessary to provide the explicit serial via -s/--serial.

If only one device is connected via USB (respectively, via TCP/IP), it
might be convenient to select it automatically. For this purpose, two
new options are introduced:
 - -d/--select-usb: select the single device connected over USB
 - -e/--select-tcpip: select the single device connected over TCP/IP

PR #3005 <https://github.com/Genymobile/scrcpy/pull/3005>

app/scrcpy.1

@@ -43,6 +43,12 @@ The values are expressed in the device natural orientation (typically, portrait
 .B \-\-max\-size
 value is computed on the cropped size.
 
+.TP
+.B \-d, \-\-select\-usb
+Use USB device (if there is exactly one, like adb -d).
+
+Also see \fB\-e\fR (\fB\-\-select\-tcpip\fR).
+
 .TP
 .BI "\-\-disable-screensaver"
 Disable screensaver while scrcpy is running.
@@ -62,6 +68,12 @@ Add a buffering delay (in milliseconds) before displaying. This increases latenc
 
 Default is 0 (no buffering).
 
+.TP
+.B \-e, \-\-select\-tcpip
+Use TCP/IP device (if there is exactly one, like adb -e).
+
+Also see \fB\-d\fR (\fB\-\-select\-usb\fR).
+
 .TP
 .BI "\-\-encoder " name
 Use a specific MediaCodec encoder (must be a H.264 encoder).

app/src/adb/adb.c

@@ -451,6 +451,10 @@ sc_adb_accept_device(const struct sc_adb_device *device,
                 }
             }
             return !strcmp(selector->serial, device->serial);
+        case SC_ADB_DEVICE_SELECT_USB:
+            return !sc_adb_is_serial_tcpip(device->serial);
+        case SC_ADB_DEVICE_SELECT_TCPIP:
+            return sc_adb_is_serial_tcpip(device->serial);
         default:
             assert(!"Missing SC_ADB_DEVICE_SELECT_* handling");
             break;
@@ -542,6 +546,12 @@ sc_adb_select_device(struct sc_intr *intr,
                 assert(selector->serial);
                 LOGE("Could not find ADB device %s:", selector->serial);
                 break;
+            case SC_ADB_DEVICE_SELECT_USB:
+                LOGE("Could not find any ADB device over USB:");
+                break;
+            case SC_ADB_DEVICE_SELECT_TCPIP:
+                LOGE("Could not find any ADB device over TCP/IP:");
+                break;
             default:
                 assert(!"Unexpected selector type");
                 break;
@@ -562,12 +572,21 @@ sc_adb_select_device(struct sc_intr *intr,
                 LOGE("Multiple (%" SC_PRIsizet ") ADB devices with serial %s:",
                      sel_count, selector->serial);
                 break;
+            case SC_ADB_DEVICE_SELECT_USB:
+                LOGE("Multiple (%" SC_PRIsizet ") ADB devices over USB:",
+                     sel_count);
+                break;
+            case SC_ADB_DEVICE_SELECT_TCPIP:
+                LOGE("Multiple (%" SC_PRIsizet ") ADB devices over TCP/IP:",
+                     sel_count);
+                break;
             default:
                 assert(!"Unexpected selector type");
                 break;
         }
         sc_adb_devices_log(SC_LOG_LEVEL_ERROR, devices, count);
-        LOGE("Select a device via -s (--serial)");
+        LOGE("Select a device via -s (--serial), -d (--select-usb) or -e "
+             "(--select-tcpip)");
         sc_adb_devices_destroy_all(devices, count);
         return false;
     }

app/src/adb/adb.h

@@ -21,6 +21,8 @@ sc_adb_get_executable(void);
 enum sc_adb_device_selector_type {
     SC_ADB_DEVICE_SELECT_ALL,
     SC_ADB_DEVICE_SELECT_SERIAL,
+    SC_ADB_DEVICE_SELECT_USB,
+    SC_ADB_DEVICE_SELECT_TCPIP,
 };
 
 struct sc_adb_device_selector {

app/src/cli.c

@@ -118,6 +118,12 @@ static const struct sc_option options[] = {
                 "(typically, portrait for a phone, landscape for a tablet). "
                 "Any --max-size value is cmoputed on the cropped size.",
     },
+    {
+        .shortopt = 'd',
+        .longopt = "select-usb",
+        .text = "Use USB device (if there is exactly one, like adb -d).\n"
+                "Also see -e (--select-tcpip).",
+    },
     {
         .longopt_id = OPT_DISABLE_SCREENSAVER,
         .longopt = "disable-screensaver",
@@ -141,6 +147,12 @@ static const struct sc_option options[] = {
                 "This increases latency to compensate for jitter.\n"
                 "Default is 0 (no buffering).",
     },
+    {
+        .shortopt = 'e',
+        .longopt = "select-tcpip",
+        .text = "Use TCP/IP device (if there is exactly one, like adb -e).\n"
+                "Also see -d (--select-usb).",
+    },
     {
         .longopt_id = OPT_ENCODER_NAME,
         .longopt = "encoder",
@@ -1320,6 +1332,12 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
                     return false;
                 }
                 break;
+            case 'd':
+                opts->select_usb = true;
+                break;
+            case 'e':
+                opts->select_tcpip = true;
+                break;
             case 'f':
                 opts->fullscreen = true;
                 break;
@@ -1559,8 +1577,16 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
     // If a TCP/IP address is provided, then tcpip must be enabled
     assert(opts->tcpip || !opts->tcpip_dst);
 
-    if (opts->serial && opts->tcpip_dst) {
+    unsigned selectors = !!opts->serial
-        LOGE("Incompatible options: -s/--serial and --tcpip with an argument");
+                       + !!opts->tcpip_dst
+                       + opts->select_tcpip
+                       + opts->select_usb;
+    if (selectors > 1) {
+        LOGE("At most one device selector option may be passed, among:\n"
+             "  --serial (-s)\n"
+             "  --select-usb (-d)\n"
+             "  --select-tcpip (-e)\n"
+             "  --tcpip=<addr> (with an argument)");
         return false;
     }
 

app/src/options.c

@@ -60,4 +60,6 @@ const struct scrcpy_options scrcpy_options_default = {
     .downsize_on_error = true,
     .tcpip = false,
     .tcpip_dst = NULL,
+    .select_tcpip = false,
+    .select_usb = false,
 };

app/src/options.h

@@ -135,6 +135,8 @@ struct scrcpy_options {
     bool downsize_on_error;
     bool tcpip;
     const char *tcpip_dst;
+    bool select_usb;
+    bool select_tcpip;
 };
 
 extern const struct scrcpy_options scrcpy_options_default;

app/src/scrcpy.c

@@ -297,6 +297,8 @@ scrcpy(struct scrcpy_options *options) {
 
     struct sc_server_params params = {
         .req_serial = options->serial,
+        .select_usb = options->select_usb,
+        .select_tcpip = options->select_tcpip,
         .log_level = options->log_level,
         .crop = options->crop,
         .port_range = options->port_range,

app/src/server.c

@@ -687,10 +687,19 @@ run_server(void *data) {
     bool need_initial_serial = !params->tcpip_dst;
 
     if (need_initial_serial) {
+        // At most one of the 3 following parameters may be set
+        assert(!!params->req_serial
+               + params->select_usb
+               + params->select_tcpip <= 1);
+
         struct sc_adb_device_selector selector;
         if (params->req_serial) {
             selector.type = SC_ADB_DEVICE_SELECT_SERIAL;
             selector.serial = params->req_serial;
+        } else if (params->select_usb) {
+            selector.type = SC_ADB_DEVICE_SELECT_USB;
+        } else if (params->select_tcpip) {
+            selector.type = SC_ADB_DEVICE_SELECT_TCPIP;
         } else {
             selector.type = SC_ADB_DEVICE_SELECT_ALL;
         }

app/src/server.h

@@ -44,6 +44,8 @@ struct sc_server_params {
     bool downsize_on_error;
     bool tcpip;
     const char *tcpip_dst;
+    bool select_usb;
+    bool select_tcpip;
 };
 
 struct sc_server {