Updates for alsa and oss.

alsa.c

@@ -27,6 +27,7 @@
 typedef struct alsa
 {
    snd_pcm_t *pcm;
+   bool nonblock;
 } alsa_t;
 
 static void* __alsa_init(const char* device, int rate, int latency)
@@ -125,7 +126,8 @@ static ssize_t __alsa_write(void* data, const void* buf, size_t size)
 
       return size;
    }
-
+   else if ( alsa->nonblock && frames == -EAGAIN )
+      return 0;
    else if ( frames < 0 )
       return -1;
 
@@ -134,11 +136,16 @@ static ssize_t __alsa_write(void* data, const void* buf, size_t size)
 
 static bool __alsa_stop(void *data)
 {
-/*   int *fd = data;
-   ioctl(*fd, SNDCTL_DSP_RESET, 0);*/
    return true;
 }
 
+static void __alsa_set_nonblock_state(void *data, bool state)
+{
+   alsa_t *alsa = data;
+   snd_pcm_nonblock(alsa->pcm, state);
+   alsa->nonblock = state;
+}
+
 static bool __alsa_start(void *data)
 {
    return true;
@@ -163,6 +170,7 @@ const audio_driver_t audio_alsa = {
    .write = __alsa_write,
    .stop = __alsa_stop,
    .start = __alsa_start,
+   .set_nonblock_state = __alsa_set_nonblock_state,
    .free = __alsa_free
 };
 

config.h

@@ -39,7 +39,7 @@
 
 // Chooses which video and audio subsystem to use. Remember to update config.mk if you change these.
 #define VIDEO_DRIVER VIDEO_GL
-#define AUDIO_DRIVER AUDIO_RSOUND
+#define AUDIO_DRIVER AUDIO_ALSA
 
 
 ////////////////

config.mk

@@ -2,9 +2,9 @@
 BUILD_OPENGL = 1
 BUILD_FILTER = 0
 
-BUILD_RSOUND = 1
+BUILD_RSOUND = 0
 BUILD_OSS = 0
-BUILD_ALSA = 0
+BUILD_ALSA = 1
 
 
 PREFIX = /usr/local

oss.c

@@ -22,6 +22,7 @@
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
+#include <errno.h>
 
 static void* __oss_init(const char* device, int rate, int latency)
 {
@@ -86,7 +87,11 @@ static ssize_t __oss_write(void* data, const void* buf, size_t size)
 
    ssize_t ret;
    if ( (ret = write(*fd, buf, size)) <= 0 )
+   {
+      if ( (fcntl(*fd, F_GETFL) & O_NONBLOCK) && errno == EAGAIN )
+         return 0;
       return -1;
+   }
 
    return ret;
 }
@@ -103,6 +108,15 @@ static bool __oss_start(void *data)
    return true;
 }
 
+static void __oss_set_nonblock_state(void *data, bool state)
+{
+   int *fd = data;
+   if (state)
+      fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) | O_NONBLOCK);
+   else
+      fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) & (~O_NONBLOCK));
+}
+
 static void __oss_free(void *data)
 {
    int *fd = data;
@@ -117,6 +131,7 @@ const audio_driver_t audio_oss = {
    .write = __oss_write,
    .stop = __oss_stop,
    .start = __oss_start,
+   .set_nonblock_state = __oss_set_nonblock_state,
    .free = __oss_free
 };
 

ssnes.c

@@ -244,7 +244,10 @@ static void audio_sample(uint16_t left, uint16_t right)
       src_float_to_short_array(outsamples, temp_outsamples, src_data.output_frames_gen * 2);
 
       if ( driver.audio->write(driver.audio_data, temp_outsamples, src_data.output_frames_gen * 4) < 0 )
+      {
+         fprintf(stderr, "SSNES [ERROR]: Audio backend failed to write. Will continue without sound.\n");
          audio_active = false;
+      }
 
       data_ptr = 0;
    }