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#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;
}
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