ao_plugin.c and plugin headers added

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3097 b3059339-0415-0410-9bf9-f77b7e298cf2

libao2/ao_plugin.c

@@ -0,0 +1,145 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../config.h"
+
+#include "audio_out.h"
+#include "audio_out_internal.h"
+
+#include "audio_plugin.h"
+
+static ao_info_t info = 
+{
+	"Plugin audio output",
+	"plugin",
+	"Anders",
+	""
+};
+
+LIBAO_EXTERN(plugin)
+
+#define plugin(i) (ao_plugin_local_data.ao_plugins[i])
+#define driver() (ao_plugin_local_data.ao_driver)
+
+/* local data */
+typedef struct ao_plugin_local_data_s
+{
+  ao_plugin_functions_t** ao_plugins; /* List of all plugins */
+  ao_functions_t* ao_driver;          /* ao driver used by ao_plugin */
+} ao_plugin_local_data_t;
+
+ao_plugin_local_data_t ao_plugin_local_data;
+
+/* gloabal data */
+ao_plugin_data_t ao_plugin_data;
+
+// to set/get/query special features/parameters
+static int control(int cmd,int arg){
+  return driver()->control(cmd,arg);
+}
+
+// open & setup audio device and plugins
+// return: 1=success 0=fail
+static int init(int rate,int channels,int format,int flags){
+  int ok=1;
+
+  /* FIXME these are cfg file parameters */
+  int i=0; 
+  ao_plugin_local_data.ao_plugins=malloc((i+1)*sizeof(ao_plugin_functions_t*));
+  plugin(i)=NULL;
+  ao_plugin_local_data.ao_driver=audio_out_drivers[1];
+
+  /* Set input parameters and itterate through plugins each plugin
+     changes the parameters according to its output */
+  ao_plugin_data.rate=rate;
+  ao_plugin_data.channels=channels;
+  ao_plugin_data.format=format;
+  ao_plugin_data.sz_mult=1;
+  ao_plugin_data.sz_fix=0;
+  ao_plugin_data.delay_mult=1;
+  ao_plugin_data.delay_fix=0;
+  i=0;
+  while(plugin(i)&&ok)
+    ok=plugin(i++)->init();
+  
+  if(!ok) return 0;
+
+  ok = driver()->init(ao_plugin_data.rate,
+			ao_plugin_data.channels,
+			ao_plugin_data.format,
+			flags);
+  if(!ok) return 0;
+
+  /* Now that the driver is initialized we can calculate and set the
+     input and output buffers for each plugin */
+  ao_plugin_data.len=driver()->get_space();
+
+  return 1;
+}
+
+// close audio device
+static void uninit(){
+  int i=0;
+  driver()->uninit();
+  while(plugin(i))
+    plugin(i++)->uninit();
+  if(ao_plugin_local_data.ao_plugins)
+    free(ao_plugin_local_data.ao_plugins);
+}
+
+// stop playing and empty buffers (for seeking/pause)
+static void reset(){
+  int i=0;
+  driver()->reset();
+  while(plugin(i))
+    plugin(i++)->reset();
+}
+
+// stop playing, keep buffers (for pause)
+static void audio_pause(){
+  driver()->pause();
+}
+
+// resume playing, after audio_pause()
+static void audio_resume(){
+  driver()->resume();
+}
+
+// return: how many bytes can be played without blocking
+static int get_space(){
+  double sz=(double)(driver()->get_space());
+  sz*=ao_plugin_data.sz_mult;
+  sz+=ao_plugin_data.sz_fix;
+  return (int)(sz);
+}
+
+// plays 'len' bytes of 'data'
+// return: number of bytes played
+static int play(void* data,int len,int flags){
+  int i=0;
+  /* Due to constant buffer sizes in plugins limit length */
+  int tmp = get_space();
+  int ret_len =(tmp<len)?tmp:len;
+  /* Filter data */
+  ao_plugin_data.len=ret_len;  
+  ao_plugin_data.data=data;
+  while(plugin(i))
+    plugin(i++)->play();
+  /* Send data to output */
+  len=driver()->play(ao_plugin_data.data,ao_plugin_data.len,flags);
+
+  if(len!=ao_plugin_data.len)
+    printf("Buffer over flow in sound plugin ");
+  
+  return ret_len;
+}
+
+// return: delay in seconds between first and last sample in buffer
+static float get_delay(){
+  float delay=driver()->get_delay();
+  delay*=ao_plugin_data.delay_mult;
+  delay+=ao_plugin_data.delay_fix;
+  return delay;
+}
+
+

libao2/audio_plugin.h

@@ -0,0 +1,27 @@
+/* functions supplied by plugins */
+typedef struct ao_plugin_functions_s
+{
+	ao_info_t *info;
+        int (*control)(int cmd,int arg);
+        int (*init)(); 
+        void (*uninit)();
+        void (*reset)();
+        int (*play)();
+} ao_plugin_functions_t;
+
+/* Global data for all audio plugins */
+typedef struct ao_plugin_data_s
+{
+  void* data;       /* current data block read only ok to change */
+  int len;          /* setup and current buffer length */
+  int rate;	    /* setup data rate */
+  int channels;	    /* setup number of channels */
+  int format;	    /* setup format */
+  double sz_mult;   /* Buffer size multiplier */
+  double sz_fix;    /* Fix extra buffer size */
+  float delay_mult; /* Delay multiplier */
+  float delay_fix;  /* Fix delay */
+}ao_plugin_data_t;
+
+extern ao_plugin_data_t ao_plugin_data;
+

libao2/audio_plugin_internal.h

@@ -0,0 +1,16 @@
+// prototypes:
+static int control(int cmd,int arg);
+static int init(float*);
+static void uninit();
+static void reset();
+static int play(void* data,int len,int flags);
+
+#define LIBAO_PLUGIN_EXTERN(x) ao_functions_t audio_out_##x =\
+{\
+	&info,\
+	control,\
+	init,\
+        uninit,\
+	reset,\
+	play,\
+};