Soundcard pick

Makefile

@@ -1,7 +1,7 @@
 CC=gcc -m32
 CFLAGS = -g -O0 -fPIC -m32 -Wall -Werror -Wno-unused-variable -Wno-unused-function
 LD = g++ -m32
-LDFLAGS = -Wl,-z,defs -rdynamic -static-libstdc++ -static-libgcc -lc -ldl -lGL -lglut -lX11 -lm -lpthread -shared -nostdlib
+LDFLAGS = -Wl,-z,defs -rdynamic -static-libstdc++ -static-libgcc -lc -ldl -lGL -lglut -lX11 -lm -lpthread -shared -nostdlib -lasound
 
 BUILD = build
 

src/lindbergh/hook.c

@@ -30,6 +30,15 @@
 #include "patch.h"
 #include "pcidata.h"
 #include "input.h"
+#include "soundcard.h"
+
+#include "alsa/global.h"
+#include "alsa/input.h"
+#include "alsa/output.h" 
+#include "alsa/conf.h"
+#include "alsa/pcm.h"
+#include "alsa/control.h"
+#include "alsa/error.h"
 
 #define HOOK_FILE_NAME "/dev/zero"
 
@@ -743,3 +752,9 @@ int unsetenv(const char *name)
 
     return _unsetenv(name);
 }
+
+int snd_pcm_open(snd_pcm_t **pcmp, const char *name, snd_pcm_stream_t stream, int mode)
+{
+    int (*_snd_pcm_open)(snd_pcm_t **pcmp, const char *name, snd_pcm_stream_t stream, int mode) = dlsym(RTLD_NEXT, "snd_pcm_open");
+    return _snd_pcm_open(pcmp, get_sndcard(), stream, mode);
+}

src/lindbergh/soundcard.c

@@ -0,0 +1,63 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <malloc.h>
+#include "alsa/global.h"
+#include "alsa/input.h"
+#include "alsa/output.h" 
+#include "alsa/conf.h"
+#include "alsa/pcm.h"
+#include "alsa/control.h"
+#include "alsa/error.h"
+
+const char* get_sndcard() 
+{
+    int card = -1;
+    int err;
+    snd_ctl_t *handle;
+    snd_ctl_card_info_t *info;
+    static char hwdevice[15];
+
+    while (snd_card_next(&card) == 0 && card >= 0) 
+    {
+        char cardname[32];
+        sprintf(cardname, "hw:%d", card);
+
+        if ((err = snd_ctl_open(&handle, cardname, 0)) < 0) 
+        {
+            fprintf(stderr, "Cannot open control for card %d: %s\n", card, snd_strerror(err));
+            continue;
+        }
+
+        snd_ctl_card_info_alloca(&info);
+        if ((err = snd_ctl_card_info(handle, info)) < 0) 
+        {
+            fprintf(stderr, "Cannot get card info for card %d: %s\n", card, snd_strerror(err));
+            snd_ctl_close(handle);
+            continue;
+        }
+
+        // List PCM devices
+        int dev = -1;
+        snd_pcm_info_t *pcm_info;
+        snd_pcm_info_alloca(&pcm_info);
+        while (snd_ctl_pcm_next_device(handle, &dev) == 0 && dev >= 0) 
+        {
+            snd_pcm_info_set_device(pcm_info, dev);
+            snd_pcm_info_set_subdevice(pcm_info, 0);
+            snd_pcm_info_set_stream(pcm_info, SND_PCM_STREAM_PLAYBACK);
+            if (snd_ctl_pcm_info(handle, pcm_info) >= 0) 
+            {
+                if(strstr(snd_pcm_info_get_name(pcm_info),"HDMI") == NULL)
+                {
+                    snd_ctl_close(handle);
+                    sprintf(hwdevice, "plughw:%d,0", card);
+                    return hwdevice;
+                }
+            }
+        }
+        snd_ctl_close(handle);
+    }
+    return "plughw:0,0";
+}

src/lindbergh/soundcard.h

@@ -0,0 +1 @@
+const char* get_sndcard();