Forward client audio

app/meson.build

@@ -105,6 +105,12 @@ if v4l2_support
     src += [ 'src/v4l2_sink.c' ]
 endif
 
+libavdevice_dep = dependency('libavdevice', static: get_option('static'), required: false)
+client_audio_support = get_option('client_audio') and libavdevice_dep.found()
+if client_audio_support
+    src += [ 'src/client_audio.c' ]
+endif
+
 usb_support = get_option('usb')
 if usb_support
     src += [
@@ -129,8 +135,8 @@ dependencies = [
     dependency('sdl3', version: '>= 3.2.0', static: static),
 ]
 
-if v4l2_support
-    dependencies += dependency('libavdevice', static: static)
+if v4l2_support or client_audio_support
+    dependencies += libavdevice_dep
 endif
 
 if usb_support
@@ -182,6 +188,9 @@ conf.set('SERVER_DEBUGGER', get_option('server_debugger'))
 # enable V4L2 support (linux only)
 conf.set('HAVE_V4L2', v4l2_support)
 
+# enable client audio forwarding (requires libavdevice)
+conf.set('HAVE_CLIENT_AUDIO', client_audio_support)
+
 # enable HID over AOA support (linux only)
 conf.set('HAVE_USB', usb_support)
 

app/src/cli.c

@@ -41,6 +41,7 @@ enum {
     OPT_SHORTCUT_MOD,
     OPT_NO_KEY_REPEAT,
     OPT_LEGACY_PASTE,
+    OPT_CLIENT_AUDIO_SOURCE,
     OPT_VIDEO_ENCODER,
     OPT_POWER_OFF_ON_CLOSE,
     OPT_V4L2_SINK,
@@ -106,6 +107,7 @@ enum {
     OPT_MIN_SIZE_ALIGNMENT,
     OPT_NO_WINDOW_ASPECT_RATIO_LOCK,
     OPT_KEEP_ACTIVE,
+    OPT_LIST_AUDIO_SOURCES,
 };
 
 struct sc_option {
@@ -384,6 +386,16 @@ static const struct sc_option options[] = {
         .text = "Use TCP/IP device (if there is exactly one, like adb -e).\n"
                 "Also see -d (--select-usb).",
     },
+    {
+        .longopt_id = OPT_CLIENT_AUDIO_SOURCE,
+        .longopt = "client-audio-source",
+        .argdesc = "source",
+        .text = "Inject audio into the device microphone from a device or file.\n"
+                "The source can be:\n"
+                "  - A device name (e.g., \"Microphone\", \"default\")\n"
+                "  - A file path prefixed with \"file://\" (e.g., \"file:///path/to/audio.mp3\")\n"
+                "Supported file formats: MP3, OGG, WAV, FLAC, etc.",
+    },
     {
         .shortopt = 'f',
         .longopt = "fullscreen",
@@ -488,6 +500,11 @@ static const struct sc_option options[] = {
         .longopt = "list-encoders",
         .text = "List video and audio encoders available on the device.",
     },
+    {
+        .longopt_id = OPT_LIST_AUDIO_SOURCES,
+        .longopt = "list-client-audio-sources",
+        .text = "List available audio input sources on the client computer.",
+    },
     {
         .shortopt = 'm',
         .longopt = "max-size",
@@ -2547,6 +2564,14 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
             case OPT_AUDIO_CODEC_OPTIONS:
                 opts->audio_codec_options = optarg;
                 break;
+            case OPT_CLIENT_AUDIO_SOURCE:
+#ifdef HAVE_CLIENT_AUDIO
+                opts->client_audio_source = optarg;
+                break;
+#else
+                LOGE("Client audio (--client-audio-source) is disabled in this build");
+                return false;
+#endif
             case OPT_VIDEO_ENCODER:
                 opts->video_encoder = optarg;
                 break;
@@ -2650,6 +2675,14 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
             case OPT_LIST_APPS:
                 opts->list |= SC_OPTION_LIST_APPS;
                 break;
+            case OPT_LIST_AUDIO_SOURCES:
+#ifdef HAVE_CLIENT_AUDIO
+                args->list_audio_sources = true;
+                break;
+#else
+                LOGE("Client audio (--list-client-audio-sources) is disabled in this build");
+                return false;
+#endif
             case OPT_REQUIRE_AUDIO:
                 opts->require_audio = true;
                 break;
@@ -2833,7 +2866,11 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
         opts->audio = false;
     }
 
-    if (!opts->video && !opts->audio && !opts->control && !otg) {
+    bool has_client_audio = false;
+#ifdef HAVE_CLIENT_AUDIO
+    has_client_audio = opts->client_audio_source != NULL;
+#endif
+    if (!opts->video && !opts->audio && !opts->control && !otg && !has_client_audio) {
         LOGE("No video, no audio, no control, no OTG: nothing to do");
         return false;
     }
@@ -2947,6 +2984,15 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
         }
     }
 
+#ifdef HAVE_CLIENT_AUDIO
+    if (opts->client_audio_source &&
+        (opts->audio_source == SC_AUDIO_SOURCE_VOICE_CALL ||
+         opts->audio_source == SC_AUDIO_SOURCE_VOICE_CALL_UPLINK)) {
+        LOGE("--client-audio-source is incompatible with --audio-source=voice-call and --audio-source=voice-call-uplink");
+        return false;
+    }
+#endif
+
     if (otg) {
         if (!opts->control) {
             LOGE("--no-control is not allowed in OTG mode");

app/src/cli.h

@@ -18,6 +18,7 @@ struct scrcpy_cli_args {
     struct scrcpy_options opts;
     bool help;
     bool version;
+    bool list_audio_sources;
     enum sc_pause_on_exit pause_on_exit;
 };