mpv/libmpdemux/demux_xmms.c

// This is not reentrant because of global static variables, but most of
// the plugins are not reentrant either perhaps 
#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>
#include <dlfcn.h>
#include <dirent.h>
#include <inttypes.h>
#include <string.h>
#include <sys/stat.h>

#include "m_option.h"
#include "libaf/af_format.h"
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"

#define XMMS_PACKETSIZE 65536  // some plugins won't play if this is too small

#include "demux_xmms_plugin.h"

typedef struct {
    uint64_t spos;   // stream position in number of output bytes from 00:00:00
    InputPlugin* ip;
}  xmms_priv_t;

static pthread_mutex_t xmms_mutex;
static int format = 0x1; // Raw PCM
static char xmms_audiobuffer[XMMS_PACKETSIZE];
static uint32_t xmms_channels;
static uint32_t xmms_samplerate;
static uint32_t xmms_afmt;
static int xmms_length;
static char *xmms_title=NULL;
static uint32_t xmms_audiopos=0;
static int xmms_playing=0;
static xmms_priv_t *xmms_priv=NULL;
static uint32_t xmms_byterate;
static int64_t xmms_flushto=-1;

// =========== mplayer xmms outputplugin stuff  ==============

static void disk_close(void) {}
static void disk_pause(short p) {}
static void disk_init(void) {}

static void disk_flush(int time) {
    if (xmms_priv) xmms_flushto=time*((long long) xmms_byterate)/1000LL;    
}

static int disk_free(void) { // vqf plugin sends more than it should
    return (XMMS_PACKETSIZE-xmms_audiopos<XMMS_PACKETSIZE/4 ? 0:XMMS_PACKETSIZE-xmms_audiopos-XMMS_PACKETSIZE/4);
}

static int disk_playing(void) {
	return 0; //?? maybe plugins wait on exit until oplugin is not playing?
}

static int disk_get_output_time(void) {
    if (xmms_byterate) 
	return xmms_priv->spos*1000LL/((long long)xmms_byterate);
    else return 0;
}

static int disk_open(AFormat fmt, int rate, int nch) {
    switch (fmt) {
	case FMT_U8:
	    xmms_afmt=AF_FORMAT_U8;
	    break;
	case FMT_S8:
	    xmms_afmt=AF_FORMAT_S8;
	    break;
	case FMT_U16_LE:
	    xmms_afmt=AF_FORMAT_U16_LE;
	    break;
	case FMT_U16_NE:
#if WORDS_BIGENDIAN
	    xmms_afmt=AF_FORMAT_U16_BE;
#else
	    xmms_afmt=AF_FORMAT_U16_LE;
#endif
	    break;
	case FMT_U16_BE:
	    xmms_afmt=AF_FORMAT_U16_BE;
	    break;
	case FMT_S16_NE:
	    xmms_afmt=AF_FORMAT_S16_NE;
	    break;
	case FMT_S16_LE:
	    xmms_afmt=AF_FORMAT_S16_LE;
	    break;
	case FMT_S16_BE:
	    xmms_afmt=AF_FORMAT_S16_BE;
	    break;
    }
    xmms_samplerate=rate;
    xmms_channels=nch;
    return 1;
}

static void disk_write(void *ptr, int length) {
	if (!xmms_playing) return;
	pthread_mutex_lock(&xmms_mutex);
	if (xmms_flushto!=-1) {
	    xmms_priv->spos=xmms_flushto;
	    xmms_flushto=-1;
	    xmms_audiopos=0;
	}
	xmms_priv->spos+= length;
	memcpy(&xmms_audiobuffer[xmms_audiopos],ptr,length);
	xmms_audiopos+=length;
	pthread_mutex_unlock(&xmms_mutex);
}

static OutputPlugin xmms_output_plugin =
{
	NULL,
	NULL,
	"MPlayer output interface plugin ", /* Description */
	disk_init,
	NULL,			/* about */
	NULL,			/* configure */
	NULL,			/* get_volume */
	NULL,			/* set_volume */
	disk_open,
	disk_write,
	disk_close,
	disk_flush,
	disk_pause,
	disk_free,
	disk_playing,
	disk_get_output_time,
	disk_get_output_time //we pretend that everything written is played at once
};

// ==================== mplayer xmms inputplugin helper stuff =================

static InputPlugin* input_plugins[100];
static int no_plugins=0;

/* Dummy functions  */
static InputVisType input_get_vis_type(){return 0;}
static void input_add_vis_pcm(int time, AFormat fmt, int nch, int length, void *ptr){}
static void input_set_info_text(char * text){}
char *xmms_get_gentitle_format(){ return ""; }
/* Dummy functions  END*/

static void input_set_info(char* title,int length, int rate, int freq, int nch){
    xmms_length=length;
}

static void init_plugins(){
    DIR *dir;
    struct dirent *ent;
    
    no_plugins=0;

    dir = opendir(XMMS_INPUT_PLUGIN_DIR);
    if (!dir) return;
    
    while ((ent = readdir(dir)) != NULL){
	char filename[strlen(XMMS_INPUT_PLUGIN_DIR)+strlen(ent->d_name)+4];
	void* handle;
	sprintf(filename,XMMS_INPUT_PLUGIN_DIR "/%s",ent->d_name);
	handle=dlopen(filename, RTLD_NOW);
	if(handle){
	    void *(*gpi) (void);
	    gpi=dlsym(handle, "get_iplugin_info");
	    if(gpi){
		InputPlugin *p=gpi();
		printf("XMMS: found plugin: %s (%s)\n",ent->d_name,p->description);
		p->handle = handle;
		p->filename = strdup(filename);
		p->get_vis_type = input_get_vis_type;
		p->add_vis_pcm = input_add_vis_pcm;
		p->set_info = input_set_info;
		p->set_info_text = input_set_info_text;
		if(p->init) p->init();
		input_plugins[no_plugins++]=p;
	    } else
		dlclose(handle);
	}
    }
    closedir(dir);
}

static void cleanup_plugins(){
    while(no_plugins>0){
	--no_plugins;
	printf("XMMS: Closing plugin %s\n",input_plugins[no_plugins]->filename);
	if(input_plugins[no_plugins]->cleanup)
	    input_plugins[no_plugins]->cleanup();
	dlclose(input_plugins[no_plugins]->handle);
    }
}

// ============================ mplayer demuxer stuff ===============

static int demux_xmms_open(demuxer_t* demuxer) {
  InputPlugin* ip = NULL;
  sh_audio_t* sh_audio;
  WAVEFORMATEX* w;
  xmms_priv_t *priv;
  int i;

  if (xmms_priv) return 0; // as I said, it's not reentrant :)
  init_plugins();
  for(i=0;i<no_plugins;i++){
      if (input_plugins[i]->is_our_file(demuxer->stream->url)){
          ip=input_plugins[i]; break;
      }
  }
  if(!ip) return 0; // no plugin to handle this...
  
  pthread_mutex_init(&xmms_mutex,NULL);    

  xmms_priv=priv=(xmms_priv_t *)malloc(sizeof(xmms_priv_t));
  memset(priv,0,sizeof(xmms_priv_t));
  priv->ip=ip;

  memset(xmms_audiobuffer,0,XMMS_PACKETSIZE);

  xmms_channels=0;
  sh_audio = new_sh_audio(demuxer,0);
  sh_audio->wf = w = (WAVEFORMATEX*)malloc(sizeof(WAVEFORMATEX));
  w->wFormatTag = sh_audio->format = format;
      
  demuxer->movi_start = 0;
  demuxer->movi_end = 100;
  demuxer->audio->id = 0;
  demuxer->audio->sh = sh_audio;
  demuxer->priv=priv;
  sh_audio->ds = demuxer->audio;

  xmms_output_plugin.init();
  ip->output = &xmms_output_plugin;
  xmms_playing=1;
  ip->play_file(demuxer->stream->url);
  if (ip->get_song_info) ip->get_song_info(demuxer->stream->url,&xmms_title,&xmms_length);
  if (xmms_length<=0) demuxer->seekable=0;

  mp_msg(MSGT_DEMUX,MSGL_INFO,"Waiting for the XMMS plugin to start playback of '%s'...\n",demuxer->stream->url);
  while (xmms_channels==0) {
    usleep(10000);
    if(ip->get_time()<0) return 0;
  }
  sh_audio->sample_format= xmms_afmt;
  switch (xmms_afmt) {
    case AF_FORMAT_S16_LE:
    case AF_FORMAT_S16_BE:
    case AF_FORMAT_U16_LE:
    case AF_FORMAT_U16_BE:
        sh_audio->samplesize = 2;
	break;
    default:
	sh_audio->samplesize = 1;
  }
  w->wBitsPerSample = sh_audio->samplesize*8;
  w->nChannels = sh_audio->channels = xmms_channels;
  w->nSamplesPerSec = sh_audio->samplerate = xmms_samplerate; 
  xmms_byterate = w->nAvgBytesPerSec = xmms_samplerate*sh_audio->channels*sh_audio->samplesize;
  w->nBlockAlign = sh_audio->samplesize*sh_audio->channels;
  w->cbSize = 0;
  
  return DEMUXER_TYPE_XMMS;
}

static int demux_xmms_fill_buffer(demuxer_t* demuxer, demux_stream_t *ds) {
  sh_audio_t *sh_audio = demuxer->audio->sh;
  xmms_priv_t *priv=demuxer->priv;
  demux_packet_t*  dp;
  
  if (xmms_length<=0) demuxer->seekable=0;
  else demuxer->seekable=1;

  while (xmms_audiopos<XMMS_PACKETSIZE/2) {
    if((priv->ip->get_time()<0) || !xmms_playing)
	return 0;	
    usleep(1000);    
  }

  pthread_mutex_lock(&xmms_mutex);
  dp = new_demux_packet(XMMS_PACKETSIZE/2);
  ds->pts = priv->spos / sh_audio->wf->nAvgBytesPerSec;
  ds->pos = priv->spos;

  memcpy(dp->buffer,xmms_audiobuffer,XMMS_PACKETSIZE/2);
  memcpy(xmms_audiobuffer,&xmms_audiobuffer[XMMS_PACKETSIZE/2],xmms_audiopos-XMMS_PACKETSIZE/2);
  xmms_audiopos-=XMMS_PACKETSIZE/2;
  pthread_mutex_unlock(&xmms_mutex);

  ds_add_packet(ds,dp);
  
  return 1;
}

static void demux_xmms_seek(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
  stream_t* s = demuxer->stream;
  sh_audio_t* sh_audio = demuxer->audio->sh;
  xmms_priv_t *priv=demuxer->priv;
  int32_t pos;

  if(priv->ip->get_time()<0) return;
  
  pos = (flags & 1) ? 0 : priv->spos / sh_audio->wf->nAvgBytesPerSec;
  if (flags & 2) 
    pos+= rel_seek_secs*xmms_length;
  else 
    pos+= rel_seek_secs;  

  if (pos<0) pos=0;
  if (pos>=xmms_length) pos=xmms_length-1;

  priv->ip->seek((pos<0)?0:pos);
  priv->spos=pos * sh_audio->wf->nAvgBytesPerSec;
  sh_audio->delay=pos; //priv->spos / sh_audio->wf->nAvgBytesPerSec;
}

static void demux_close_xmms(demuxer_t* demuxer) {
  xmms_priv_t *priv=demuxer->priv;
  xmms_playing=0;
  xmms_audiopos=0; // xmp on exit waits until buffer is free enough
  if (priv != NULL) {
    if (priv->ip != NULL)
      priv->ip->stop();
    free(priv); xmms_priv=demuxer->priv=NULL;
  }
  cleanup_plugins();
}

static int demux_xmms_control(demuxer_t *demuxer,int cmd, void *arg){
    demux_stream_t *d_video=demuxer->video;
    sh_audio_t *sh_audio=demuxer->audio->sh;
    xmms_priv_t *priv=demuxer->priv;

    switch(cmd) {
	case DEMUXER_CTRL_GET_TIME_LENGTH:
	    if (xmms_length<=0) return DEMUXER_CTRL_DONTKNOW;
	    *((double *)arg)=(double)xmms_length/1000;
	    return DEMUXER_CTRL_GUESS;

	case DEMUXER_CTRL_GET_PERCENT_POS:
	    if (xmms_length<=0) 
    		return DEMUXER_CTRL_DONTKNOW;
    	    *((int *)arg)=(int)( priv->spos / (float)(sh_audio->wf->nAvgBytesPerSec) / xmms_length );
	    return DEMUXER_CTRL_OK;

	default:
	    return DEMUXER_CTRL_NOTIMPL;
    }
}


demuxer_desc_t demuxer_desc_xmms = {
  "XMMS demuxer",
  "xmms",
  "XMMS",
  "?",
  "requires XMMS plugins",
  DEMUXER_TYPE_XMMS,
  0, // safe autodetect
  demux_xmms_open,
  demux_xmms_fill_buffer,
  NULL,
  demux_close_xmms,
  demux_xmms_seek,
  demux_xmms_control
};