Add build options for libtgvoip backends

libtgvoip has options to disbale some backends, but they never were exposed via tdesktop's cmake

Since libtgvoip autoconf build system doesn't work anymore, it's worth to have these options in tdesktop's cmake.

.github/workflows/linux.yml

@@ -65,6 +65,8 @@ jobs:
           - "DESKTOP_APP_DISABLE_X11_INTEGRATION"
           - "DESKTOP_APP_DISABLE_WAYLAND_INTEGRATION"
           - "DESKTOP_APP_DISABLE_GTK_INTEGRATION"
+          - "LIBTGVOIP_DISABLE_ALSA"
+          - "LIBTGVOIP_DISABLE_PULSEAUDIO"
 
     env:
       UPLOAD_ARTIFACT: "false"

Telegram/cmake/lib_tgvoip.cmake

@@ -27,6 +27,9 @@ if (NOT TGVOIP_FOUND)
         init_target(lib_tgvoip_bundled cxx_std_14) # Can't use std::optional::value on macOS.
     endif()
 
+    option(LIBTGVOIP_DISABLE_ALSA "Disable libtgvoip's ALSA backend (Linux only)." OFF)
+    option(LIBTGVOIP_DISABLE_PULSEAUDIO "Disable libtgvoip's PulseAudio backend (Linux only)." OFF)
+
     set(tgvoip_loc ${third_party_loc}/libtgvoip)
 
     nice_target_sources(lib_tgvoip_bundled ${tgvoip_loc}
@@ -180,15 +183,36 @@ if (NOT TGVOIP_FOUND)
     )
 
     if (LINUX)
-        find_package(PkgConfig REQUIRED)
-        find_package(ALSA REQUIRED)
-        pkg_check_modules(PULSE REQUIRED libpulse)
+        if (NOT LIBTGVOIP_DISABLE_ALSA)
+            find_package(ALSA REQUIRED)
+            target_include_directories(lib_tgvoip_bundled PRIVATE ${ALSA_INCLUDE_DIRS})
+        else()
+            remove_target_sources(lib_tgvoip_bundled ${tgvoip_loc}
+                os/linux/AudioInputALSA.cpp
+                os/linux/AudioInputALSA.h
+                os/linux/AudioOutputALSA.cpp
+                os/linux/AudioOutputALSA.h
+            )
 
-        target_include_directories(lib_tgvoip_bundled
-        PRIVATE
-            ${ALSA_INCLUDE_DIRS}
-            ${PULSE_INCLUDE_DIRS}
-        )
+            target_compile_definitions(lib_tgvoip_bundled PRIVATE WITHOUT_ALSA)
+        endif()
+
+        if (NOT LIBTGVOIP_DISABLE_PULSEAUDIO)
+            find_package(PkgConfig REQUIRED)
+            pkg_check_modules(PULSE REQUIRED libpulse)
+            target_include_directories(lib_tgvoip_bundled PRIVATE ${PULSE_INCLUDE_DIRS})
+        else()
+            remove_target_sources(lib_tgvoip_bundled ${tgvoip_loc}
+                os/linux/AudioOutputPulse.cpp
+                os/linux/AudioOutputPulse.h
+                os/linux/AudioInputPulse.cpp
+                os/linux/AudioInputPulse.h
+                os/linux/AudioPulse.cpp
+                os/linux/AudioPulse.h
+            )
+
+            target_compile_definitions(lib_tgvoip_bundled PRIVATE WITHOUT_PULSE)
+        endif()
 
         target_link_libraries(lib_tgvoip_bundled
         PRIVATE