mupen64plus: modify launch script for RPI detection

Since recent kernels don't have the BCM string in `/proc/cpuinfo`, update the Raspberry Pi detection to use the device tree.

Other updates:

 * simplifed the selection of the OMX output plugin and port number. Applies only to Pi models 0-4, since Pi5 cannot use OMX
 * disabled pre-setting the 'pulse' SDL audio driver for non-OMX/ALSA devices. SDL will try 'pulseaudio' ('pulse' is the SDL 1.2 name) then 'alsa' in this order, so there's no need to force it to 'pulseaudio'. Starting with 2.0.22, SDL supports a list of drivers in the AUDIODEVICE hint, but Buster based systems are not there yet.

Author: cmitu

scriptmodules/emulators/mupen64plus/mupen64plus.sh

@@ -133,37 +133,25 @@ function remap() {
 }
 
 function setAudio() {
-    if [[ "$(sed -n '/^Hardware/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo)" == *BCM* ]]; then
-        # If a raspberry pi is used try to set the right output and use audio omx if possible
-        local audio_device=$(amixer)
-        if [[ "$audio_device" == *PCM* ]]; then
-            # use audio omx if we use rpi internal audio device
+    if tr -d '\0' < /proc/device-tree/compatible | grep -Eq raspberrypi,[0-4]; then
+        # If a Raspberry Pi is used, try to set the right output and use audio OMX if possible
+        # check for the presence of the non-KMS audio driver
+        if aplay -l | grep -qm1 "bcm2835 HDMI"; then
+            # use audio OMX when the RPI has enabled the internal audio cards
             AUDIO_PLUGIN="mupen64plus-audio-omx"
             iniConfig " = " "\"" "$config"
             # create section if necessary
             if ! grep -q "\[Audio-OMX\]" "$config"; then
                 echo "[Audio-OMX]" >> "$config"
                 echo "Version = 1" >> "$config"
             fi
-            # read output configuration
-            local audio_port=$(amixer cget numid=3)
-            # set output port
-            if [[ "$audio_port" == *": values=0"* ]]; then
-                # echo "auto configuration"
-                # try to find the best solution
-                local video_device=$(tvservice -s)
-                if [[ "$video_device" == *HDMI* ]]; then
-                    iniSet "OUTPUT_PORT" "1"
-                else
-                    iniSet "OUTPUT_PORT" "0"
-                fi
-            elif [[ "$audio_port" == *": values=1"* ]]; then
-                # echo "audio jack"
-                iniSet "OUTPUT_PORT" "0"
-            else
-                # echo "hdmi"
+            # try to find which audio card is default by looking at the mixer's volume control name
+            if amixer -Ddefault cget numid=1 | grep -qm1 HDMI; then
                 iniSet "OUTPUT_PORT" "1"
             fi
+            if amixer -Ddefault cget numid=1 | grep -qm1 Headphones; then
+                iniSet "OUTPUT_PORT" "0"
+            fi
         fi
     fi
 }
@@ -172,7 +160,7 @@ function testCompatibility() {
     # fallback for glesn64 and rice plugin
     # some roms lead to a black screen of death
     local game
-    
+
     # these games need RSP-LLE
     local blacklist=(
         naboo
@@ -434,14 +422,13 @@ getAutoConf mupen64plus_audio && setAudio
 getAutoConf mupen64plus_compatibility_check && testCompatibility
 getAutoConf mupen64plus_texture_packs && useTexturePacks
 
-if [[ "$(sed -n '/^Hardware/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo)" == BCM* ]]; then
+if tr -d '\0' < /proc/device-tree/compatible | grep -Eq raspberrypi,[0-4]; then
     WINDOW_MODE="--windowed $RES"
     SDL_VIDEO_RPI_SCALE_MODE=1
-    # If a raspberry pi is used lower resolution to 320x240 and enable SDL dispmanx scaling mode 1
-elif [[ -e /opt/vero3/lib/libMali.so  ]]; then
+    # If a Raspberry Pi (<5) device is used, lower resolution to 320x240 and enable SDL dispmanx scaling mode 1
+fi
+if [[ -e /opt/vero3/lib/libMali.so  ]]; then
     SDL_AUDIODRIVER=alsa
-else
-    SDL_AUDIODRIVER=pulse
 fi
 
 SDL_AUDIODRIVER=${SDL_AUDIODRIVER} SDL_VIDEO_RPI_SCALE_MODE=${SDL_VIDEO_RPI_SCALE_MODE} "$rootdir/emulators/mupen64plus/bin/mupen64plus" --noosd $PARAMS ${WINDOW_MODE} --rsp ${RSP_PLUGIN}.so --gfx ${VIDEO_PLUGIN}.so --audio ${AUDIO_PLUGIN}.so --configdir "$configdir/n64" --datadir "$configdir/n64" "$ROM"