added playback simulator if /dev/dsp is unavailable

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@581 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 43 insertions, 21 deletions

diff --git a/uisimulator/common/sound.h b/uisimulator/common/sound.h
index 4da5ce9f08..cb9afcb187 100644
--- a/uisimulator/common/sound.h
+++ b/uisimulator/common/sound.h
@@ -23,8 +23,13 @@
 
 #ifdef LINUX
 
-/* The "sound device type" is simply the file descriptor */
-#define sound_t int
+/* The "sound device type" */
+
+typedef struct {
+  int fd;
+  int freq;
+  int channels;
+} sound_t;
 
 #else
  #ifdef WIN32
diff --git a/uisimulator/x11/oss_sound.c b/uisimulator/x11/oss_sound.c
index 853b70d57f..e69c403acd 100644
--- a/uisimulator/x11/oss_sound.c
+++ b/uisimulator/x11/oss_sound.c
@@ -24,15 +24,17 @@
 #include <linux/soundcard.h>
 #include "../common/sound.h"
 
-/* We want to use the "real" open in some cases */
+/* We want to use the "real" open in this file */
 #undef open
 
 int init_sound(sound_t* sound) {
-  *sound=open("/dev/dsp", O_WRONLY);
+  sound->fd=open("/dev/dsp", O_WRONLY);
+  sound->freq=-1;
+  sound->channels=-1;
 
-  if (sound < 0) {
-    fprintf(stderr,"Can not open /dev/dsp - Aborting - sound=%d\n",sound);
-    exit(-1);
+  if (sound->fd <= 0) {
+    fprintf(stderr,"Can not open /dev/dsp - simulating sound output\n");
+    sound->fd=0;
   }
 }
 
@@ -40,28 +42,43 @@ int config_sound(sound_t* sound, int sound_freq, int channels) {
   int format=AFMT_U16_LE;
   int setting=0x000C000D;  // 12 fragments size 8kb ? WHAT IS THIS?
 
-  if (ioctl(*sound,SNDCTL_DSP_SETFRAGMENT,&setting)==-1) {
-    perror("SNDCTL_DSP_SETFRAGMENT");
-  }
+  sound->freq=sound_freq;
+  sound->channels=channels;
 
-  if (ioctl(*sound,SNDCTL_DSP_CHANNELS,&channels)==-1) {
-    perror("SNDCTL_DSP_STEREO");
-  }
-  if (channels==0) { fprintf(stderr,"Warning, only mono supported\n"); }
+  if (sound->fd) {
+    if (ioctl(sound->fd,SNDCTL_DSP_SETFRAGMENT,&setting)==-1) {
+      perror("SNDCTL_DSP_SETFRAGMENT");
+    }
 
-  if (ioctl(*sound,SNDCTL_DSP_SETFMT,&format)==-1) {
-    perror("SNDCTL_DSP_SETFMT");
-  }
+    if (ioctl(sound->fd,SNDCTL_DSP_CHANNELS,&channels)==-1) {
+      perror("SNDCTL_DSP_STEREO");
+    }
+    if (channels==0) { fprintf(stderr,"Warning, only mono supported\n"); }
 
-  if (ioctl(*sound,SNDCTL_DSP_SPEED,&sound_freq)==-1) {
-    perror("SNDCTL_DSP_SPEED");
+    if (ioctl(sound->fd,SNDCTL_DSP_SETFMT,&format)==-1) {
+      perror("SNDCTL_DSP_SETFMT");
+    }
+
+    if (ioctl(sound->fd,SNDCTL_DSP_SPEED,&sound_freq)==-1) {
+      perror("SNDCTL_DSP_SPEED");
+    }
   }
 }
 
 int output_sound(sound_t* sound,const void* buf, int count) {
-  return(write(*sound,buf,count));
+  unsigned long long t;
+
+  if (sound->fd) {
+    return(write(sound->fd,buf,count));
+  } else {
+    t=(unsigned int)(((unsigned int)(1000000/sound->channels)*count)/sound->freq);
+//    fprintf(stderr,"writing %d bytes at %d frequency - sleeping for %u microseconds\n",count,sound->freq,t);
+    usleep(t);
+    return(count);
+  }
 }
 
 void close_sound(sound_t* sound) {
-  if (*sound) close(*sound);
+  if (sound->fd) close(sound->fd);
+  sound->fd=-1;
 }