mirror of https://github.com/mpv-player/mpv
216 lines
5.3 KiB
C
216 lines
5.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "../config.h"
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#include "afmt.h"
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#include "audio_out.h"
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#include "audio_out_internal.h"
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#include "audio_plugin.h"
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static ao_info_t info =
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{
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"Plugin audio output",
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"plugin",
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"Anders",
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""
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};
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LIBAO_EXTERN(plugin)
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#define plugin(i) (ao_plugin_local_data.plugins[i])
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#define driver() (ao_plugin_local_data.driver)
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// local data
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typedef struct ao_plugin_local_data_s
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{
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ao_functions_t* driver; // Output driver set in mplayer.c
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ao_plugin_functions_t** plugins; // List of used plugins
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ao_plugin_functions_t* available_plugins[NPL]; // List of available plugins
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} ao_plugin_local_data_t;
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ao_plugin_local_data_t ao_plugin_local_data={NULL,NULL,AO_PLUGINS};
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// gloabal data
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ao_plugin_data_t ao_plugin_data; // data used by the plugins
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ao_plugin_cfg_t ao_plugin_cfg=CFG_DEFAULTS; // cfg data set in cfg-mplayer.h
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// to set/get/query special features/parameters
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static int control(int cmd,int arg){
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switch(cmd){
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case AOCONTROL_SET_PLUGIN_DRIVER:
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ao_plugin_local_data.driver=(ao_functions_t*)arg;
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return CONTROL_OK;
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default:
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return driver()->control(cmd,arg);
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}
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return CONTROL_UNKNOWN;
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}
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// Recursive function for adding plugins
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// return 1 for success and 0 for error
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int add_plugin(int i,char* cfg){
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int cnt=0;
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// Find end of plugin name
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while((cfg[cnt]!=',')&&(cfg[cnt]!='\0')&&(cnt<100)) cnt++;
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if(cnt >= 100)
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return 0;
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// Is this the last itteration or just another plugin
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if(cfg[cnt]=='\0'){
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ao_plugin_local_data.plugins=malloc((i+1)*sizeof(ao_plugin_functions_t*));
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if(ao_plugin_local_data.plugins){
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ao_plugin_local_data.plugins[i+1]=NULL;
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// Find the plugin matching the cfg string name
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cnt=0;
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while(ao_plugin_local_data.available_plugins[cnt] && cnt<20){
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if(0==strcmp(ao_plugin_local_data.available_plugins[cnt]->info->short_name,cfg)){
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ao_plugin_local_data.plugins[i]=ao_plugin_local_data.available_plugins[cnt];
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return 1;
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}
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cnt++;
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}
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printf("[plugin]: Invalid plugin: %s \n",cfg);
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return 0;
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}
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else
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return 0;
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} else {
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cfg[cnt]='\0';
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if(add_plugin(i+1,&cfg[cnt+1])){
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cnt=0;
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// Find the plugin matching the cfg string name
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while(ao_plugin_local_data.available_plugins[cnt] && cnt < 20){
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if(0==strcmp(ao_plugin_local_data.available_plugins[cnt]->info->short_name,cfg)){
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ao_plugin_local_data.plugins[i]=ao_plugin_local_data.available_plugins[cnt];
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return 1;
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}
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cnt++;
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}
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printf("[plugin]: Invalid plugin: %s \n",cfg);
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return 0;
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}
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else
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return 0;
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}
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return 0; // Will never happen...
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}
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// open & setup audio device and plugins
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// return: 1=success 0=fail
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static int init(int rate,int channels,int format,int flags){
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int ok=1;
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/* Create list of plugins from cfg option */
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int i=0;
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if(ao_plugin_cfg.plugin_list){
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if(!add_plugin(i,ao_plugin_cfg.plugin_list))
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return 0;
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}
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/* Set input parameters and itterate through plugins each plugin
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changes the parameters according to its output */
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ao_plugin_data.rate=rate;
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ao_plugin_data.channels=channels;
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ao_plugin_data.format=format;
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ao_plugin_data.sz_mult=1;
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ao_plugin_data.sz_fix=0;
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ao_plugin_data.delay_mult=1;
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ao_plugin_data.delay_fix=0;
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i=0;
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while(plugin(i)&&ok)
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ok=plugin(i++)->init();
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if(!ok) return 0;
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// This should never happen but check anyway
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if(NULL==ao_plugin_local_data.driver)
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return 0;
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ok = driver()->init(ao_plugin_data.rate,
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ao_plugin_data.channels,
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ao_plugin_data.format,
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flags);
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if(!ok) return 0;
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/* Now that the driver is initialized we can calculate and set the
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input and output buffers for each plugin */
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ao_plugin_data.len=driver()->get_space();
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while((i>0) && ok)
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ok=plugin(--i)->control(AOCONTROL_PLUGIN_SET_LEN,0);
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if(!ok) return 0;
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return 1;
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}
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// close audio device
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static void uninit(){
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int i=0;
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driver()->uninit();
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while(plugin(i))
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plugin(i++)->uninit();
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if(ao_plugin_local_data.plugins)
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free(ao_plugin_local_data.plugins);
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}
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// stop playing and empty buffers (for seeking/pause)
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static void reset(){
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int i=0;
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driver()->reset();
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while(plugin(i))
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plugin(i++)->reset();
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}
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// stop playing, keep buffers (for pause)
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static void audio_pause(){
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driver()->pause();
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}
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// resume playing, after audio_pause()
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static void audio_resume(){
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driver()->resume();
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}
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// return: how many bytes can be played without blocking
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static int get_space(){
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double sz=(double)(driver()->get_space());
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sz*=ao_plugin_data.sz_mult;
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sz+=ao_plugin_data.sz_fix;
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return (int)(sz);
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}
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// plays 'len' bytes of 'data'
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// return: number of bytes played
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static int play(void* data,int len,int flags){
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int i=0;
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/* Due to constant buffer sizes in plugins limit length */
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int tmp = get_space();
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int ret_len =(tmp<len)?tmp:len;
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/* Filter data */
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ao_plugin_data.len=ret_len;
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ao_plugin_data.data=data;
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while(plugin(i))
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plugin(i++)->play();
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/* Send data to output */
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len=driver()->play(ao_plugin_data.data,ao_plugin_data.len,flags);
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if(len!=ao_plugin_data.len)
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fprintf(stderr,"[ao_plugin] Warning under or over flow in sound plugin");
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return ret_len;
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}
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// return: delay in seconds between first and last sample in buffer
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static float get_delay(){
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float delay=driver()->get_delay();
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delay*=ao_plugin_data.delay_mult;
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delay+=ao_plugin_data.delay_fix;
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return delay;
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}
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