path: root/mp3live~/mp3fileout~.c

/* ------------------------ mp3fileout~ --------------------------------------- */
/*                                                                              */
/* Tilde object to send an mp3 file to a peer using mp3streamin~                */
/* Written by Yves Degoyon (ydegoyon@free.fr).                                  */
/* Tarballs and updates @ http://ydegoyon.free.fr                               */
/*                                                                              */
/* This program is free software; you can redistribute it and/or                */
/* modify it under the terms of the GNU General Public License                  */
/* as published by the Free Software Foundation; either version 2               */
/* of the License, or (at your option) any later version.                       */
/*                                                                              */
/* See file LICENSE for further informations on licensing terms.                */
/*                                                                              */
/* This program is distributed in the hope that it will be useful,              */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of               */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                */
/* GNU General Public License for more details.                                 */
/*                                                                              */
/* You should have received a copy of the GNU General Public License            */
/* along with this program; if not, write to the Free Software                  */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.  */
/*                                                                              */
/* Based on PureData by Miller Puckette and others.                             */
/* Uses the LAME MPEG 1 Layer 3 encoding library (lame_enc.dll) which can       */
/* be found at http://www.cdex.n3.net.                                          */
/*                                                                              */
/* "See mass murder on a scale you've never seen"                                */
/* "And all the one who tried hard to succeed"                                   */
/* You know who, don't you ???                                                  */
/* ---------------------------------------------------------------------------- */
                                                                                     

#include <m_imp.h>
#include <g_canvas.h>

#include <sys/types.h>
#include <string.h>
#ifdef UNIX
#include <sys/socket.h>
#include <errno.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/time.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include "mpg123.h"      /* mpg123 decoding library from lame 3.92 */
#include "mpglib.h"      /* mpglib decoding library from lame 3.92 */
#include "interface.h"   /* mpglib decoding library from lame 3.92 */
#define SOCKET_ERROR -1
#else
#include <winsock.h>
#endif

#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif

#define INPUT_BUFFER_SIZE 32768
#define OUTPUT_BUFFER_SIZE 32768
#define MAX_FRAME_SIZE 1152

/* useful debugging functions from mpglib */
extern int decode_header( struct frame* fr, unsigned long newhead );
extern void print_header_compact( struct frame* fr );
extern int head_check( unsigned long head, int check_layer );

/* time-out used for select() call */
static struct timeval ztout;

static char   *mp3fileout_version = "mp3fileout~: mp3 file streamer version 0.2, written by ydegoyon@free.fr";

extern void sys_sockerror(char *s);

void mp3fileout_closesocket(int fd)
{
#ifdef UNIX
    if ( close(fd) < 0 )
    {
       perror( "close" );
    }
    else
    {
       post( "mp3fileout~ : closed socket : %d", fd );
    }
#endif
#ifdef NT
    closesocket(fd);
#endif
    sys_rmpollfn(fd);
}

/* ------------------------ mp3fileout~ ----------------------------- */

static t_class *mp3fileout_class;

typedef struct _mp3fileout
{
     t_object x_obj;
     t_int x_socket;
     t_int x_fd;         /* file descriptor for the mp3 file */
     t_int x_eof;        /* end of file is reached           */
     t_int x_emit;       /* indicates the ability to emit    */
     t_int x_nbwaitloops;/* synchronization cycles count     */
     t_int x_blocksize;  /* actual blocksize                 */

     void *x_inbuffer;   /* accumulation buffer for read mp3 frames */
     t_int x_inwriteposition;
     t_int x_inbuffersize;
     t_int x_framesize;
     t_int x_offset;     /* offset used for decoding                    */
     t_int x_nbloops;    /* number of perform loops                     */

     void *x_outbuffer;   /* buffer to be emitted */       
     t_int x_outframes;   /* number of frames emitted */
     t_int x_outbuffersize;
     t_int x_outavable;   /* number of available bytes to emit */

     t_canvas *x_canvas;                

     t_outlet *x_connected; /* indicates state of the connection */
     t_outlet *x_endreached;/* indicates the end of file         */
     t_outlet *x_frames;    /* indicates the number of frames emitted */

} t_mp3fileout;

static int mp3fileout_search_header(t_mp3fileout *x)
{
  t_int i;
  t_int length = 0;
  struct frame hframe;
  unsigned long cheader;
  t_int ret = sizeof( unsigned long);
  t_int foffset = 0;
  unsigned int a,b,c,d;
  unsigned char buf[sizeof(unsigned long)];
  t_float nbsamplesframe = 0;

  while( ret>0 )
  {
    ret = read( x->x_fd, (void *)buf, sizeof( unsigned long ) );
    
    foffset+=ret;

    if ( ret>0 ) 
    {
      /* check for a valid header */
      a = buf[0];
      b = buf[1];
      c = buf[2];
      d = buf[3];

      cheader = 0;
      cheader = a;
      cheader <<= 8;
      cheader |= b;
      cheader <<= 8;
      cheader |= c;
      cheader <<= 8;
      cheader |= d; 
      if ( head_check( cheader, 0 ) )
      {
        decode_header( &hframe, cheader );
        // print_header_compact( &hframe );
        x->x_framesize = hframe.framesize;
        nbsamplesframe = ( hframe.mpeg25 ? 576 : 1152 );
        x->x_nbwaitloops = (int)(nbsamplesframe/x->x_blocksize);
        if ( x->x_nbwaitloops == 0 ) x->x_nbwaitloops = 1;
        // post ( "mp3fileout~ : will wait %d loops", x->x_nbwaitloops );

        // rewind file to the start of the frame
        if ( lseek( x->x_fd, -sizeof(unsigned long), SEEK_CUR ) < 0 )
        {
          post( "mp3fileout~ : could not rewind file." );
        }
        if ( x->x_outframes == 0 ) 
        {
            post( "mp3fileout~ : found firstframe @ %d", foffset );
        }
        break;
      }
      // post( "mp3fileout~ : read %d bytes.", ret );
    } 
    else
    {
      if ( ret < 0 )
      {
         post( "mp3fileout~ : error encountered ( ret=%d )...file reading done.", ret );
         perror( "read" );
         x->x_eof = 1;
      }
      else
      {
         post( "mp3fileout~ : file reading done.", ret );
         x->x_eof = 1;
         outlet_bang( x->x_endreached );
      } 
      return -1;
    }

   }

   return x->x_framesize;
}

static int mp3fileout_read_frame(t_mp3fileout *x)
{
  int size, ret;

   if ( x->x_fd > 0 && !x->x_eof)
   {
      if ( ( size = mp3fileout_search_header( x ) ) > 0 )
      {
         if ( size+sizeof(unsigned long) >  INPUT_BUFFER_SIZE )
         {
            post( "mp3fileout~ : cannot read frame : size too big : %d", size );
            return -1;
         }
         // post( "mp3fileout~ : reading a frame : size : %d", size );
         ret = read( x->x_fd, x->x_inbuffer, size+sizeof(unsigned long) );
         
         if ( ret>0 )
         {
            memcpy( x->x_outbuffer, x->x_inbuffer, ret );
            x->x_outavable += ret;
            return ret;
         }
         else
         {
            return -1;
         }
      }
      else
      {
         return -1;
      }
   }
   else
   {
      return -1;
   }
}

static int mp3fileout_send_frame(t_mp3fileout *x)
{
  int ret=0;

    if ( x->x_socket > 0 && x->x_emit )
    {
       if ( ( ret = send( x->x_socket, x->x_outbuffer, x->x_outavable, MSG_NOSIGNAL ) ) < 0 )
       {
          post( "mp3fileout~ : connection lost." );
          perror( "send" );
          x->x_socket = -1;
          x->x_emit = 0;
          return -1;
       }
       else
       {
          memcpy( x->x_outbuffer, x->x_outbuffer+ret, x->x_outbuffersize-ret );
          x->x_outavable -= ret;
          x->x_outframes++;
          outlet_float( x->x_frames, x->x_outframes );
          // post( "mp3fileout~ : sent %d bytes, x->x_outavable : %d", ret, x->x_outavable );
       }

    } 
    else
    {
       // artificially empty buffer
       x->x_outavable = 0;
    }
    return ret;
}

static void mp3fileout_free(t_mp3fileout *x)
{
     if (x->x_socket > 0) {
        post( "mp3fileout~ : closing socket" );
        mp3fileout_closesocket(x->x_socket);
        x->x_socket = -1;
     }
     if ( x->x_fd > 0 )
     {
       if ( close( x->x_fd ) < 0 )
       {
          post( "mp3fileout~ : could not close file." );
          perror( "close" );
       }
     }
     if ( x->x_inbuffer ) freebytes( x->x_inbuffer, x->x_inbuffersize );
}

static t_int *mp3fileout_perform(t_int *w)
{
     t_mp3fileout *x = (t_mp3fileout*) (w[1]);
     int ret;
     int i = 0;

     x->x_blocksize = (t_int)(w[2]);
     // check new incoming data
     if ( x->x_socket > 0 )
     {
        if ( x->x_nbloops % x->x_nbwaitloops == 0 )
        {
           /* read a frame in the file */            
           if ( mp3fileout_read_frame(x) > 0 )
           {
             /* send the frame to the peer */          
             mp3fileout_send_frame(x);
           }
        }
        x->x_nbloops = ( x->x_nbloops+1 ) % x->x_nbwaitloops;
     }
     return (w+3);
}

static void mp3fileout_dsp(t_mp3fileout *x, t_signal **sp)
{
    dsp_add(mp3fileout_perform, 2, x, sp[0]->s_n);
}

    /* start streaming */               
static void mp3fileout_start(t_mp3fileout *x)
{
    x->x_emit = 1;
    if ( x->x_fd > 0 )
    {
      // reset file pointer
      if ( lseek( x->x_fd, 0, SEEK_SET ) < 0 )
      {
           post ( "mp3fileout~ : could not reset file pointer.");
           x->x_eof = 1;
           return;
      }
      x->x_eof = 0;
      x->x_outframes = 0;
      outlet_float( x->x_frames, x->x_outframes );
    }
}

    /* resume file reading */               
static void mp3fileout_resume(t_mp3fileout *x)
{
    x->x_emit = 1;
}

    /* seek in  file */
static void mp3fileout_seek(t_mp3fileout *x, t_floatarg foffset)
{
    if ( foffset < 0 )
    {
       post( "mp3fileout~ : wrong offset.");
       return;
    }
    if ( x->x_fd > 0 )
    {
      // reset file pointer
      if ( lseek( x->x_fd, (int)foffset, SEEK_SET ) < 0 )
      {
           post ( "mp3fileout~ : could not reset file pointer.");
           x->x_eof = 1;
           return;
      }
      x->x_eof = 0;
    }
}

    /* stop streaming */               
static void mp3fileout_stop(t_mp3fileout *x)
{
    x->x_emit = 0;
}

    /* open mp3 file */                 
static void mp3fileout_open(t_mp3fileout *x, t_symbol *filename)
{
    // first close previous file 
    if ( x->x_fd > 0 )
    {
       if ( close( x->x_fd ) < 0 )
       {
          post( "mp3fileout~ : could not close file." );
          perror( "close" );
       }
       x->x_outframes = 0;
       outlet_float( x->x_frames, x->x_outframes );
    }
    if ( ( x->x_fd = open( filename->s_name, O_RDONLY ) ) < 0 )
    {
       post( "mp3fileout~ : could not open file : %s", filename->s_name );
       perror( "open" );
       x->x_eof = 1;
    }
    else
    {
       x->x_eof = 0;
       post( "mp3fileout~ : opened file : %s ( fd = %d )", filename->s_name, x->x_fd );
    }
}

    /* connect to the peer         */
static void mp3fileout_connect(t_mp3fileout *x, t_symbol *hostname, t_floatarg fportno)
{
    struct          sockaddr_in csocket;
    struct          hostent *hp;
    int             portno            = fportno;    /* get port from message box */
 
        /* variables used for communication with the peer */
    unsigned int    len;
    int    sockfd;
 
#ifndef UNIX
    unsigned int    ret;
#else
    int    ret;
#endif
 
    if (x->x_socket >= 0)
    {
        error("mp3fileout~: already connected");
        return;
    }
 
    sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (sockfd < 0)
    {
        error("mp3fileout~: internal error while attempting to open socket");
        return;
    }
                                                         
        /* connect socket using hostname provided in command line */
    csocket.sin_family = AF_INET;
    hp = gethostbyname(hostname->s_name);
    if (hp == 0)
    {
        post("mp3fileout~: bad host?");
#ifndef UNIX
        closesocket(sockfd);
#else
        close(sockfd);
#endif
        return;
    }
    memcpy((char *)&csocket.sin_addr, (char *)hp->h_addr, hp->h_length);
 
        /* assign client port number */
    csocket.sin_port = htons((unsigned short)portno);
 
        /* try to connect.  */
    post("mp3fileout~: connecting to port %d", portno);
    if (connect(sockfd, (struct sockaddr *) &csocket, sizeof (csocket)) < 0)
    {
        error("mp3fileout~: connection failed!\n");
#ifndef UNIX
        closesocket(sockfd);
#else
        close(sockfd);
#endif
        return;
    }
 
    x->x_socket = sockfd;
    x->x_outframes = 0;
    outlet_float( x->x_frames, x->x_outframes );
    outlet_float( x->x_connected, 1 );         
    post( "mp3fileout~ : connected to peer" );
 
}  

    /* close connection to the peer         */
static void mp3fileout_disconnect(t_mp3fileout *x)
{
 
    int err = -1;
    if(x->x_socket >= 0)            /* close socket */
    {
#ifndef UNIX
        closesocket(x->x_socket);
#else
        close(x->x_socket);
#endif
        x->x_socket = -1;
        outlet_float( x->x_connected, 0 );
        x->x_outframes = 0;
        outlet_float( x->x_frames, x->x_outframes );
        post("mp3fileout~: connection closed");
    }
}

static void *mp3fileout_new(void)
{
    t_mp3fileout *x;
    int i;
    
    x = (t_mp3fileout *)pd_new(mp3fileout_class);
    x->x_connected = outlet_new( &x->x_obj, &s_float ); 
    x->x_frames = outlet_new( &x->x_obj, &s_float ); 
    x->x_endreached = outlet_new( &x->x_obj, &s_bang ); 
    
    x->x_socket = -1;
    x->x_fd = -1;
    x->x_eof = 0;
    x->x_canvas = canvas_getcurrent();

    x->x_offset = 0;
    x->x_inbuffersize = INPUT_BUFFER_SIZE;
    x->x_inbuffer = (char*) getbytes( x->x_inbuffersize );
    if ( !x->x_inbuffer )
    {
       post( "mp3fileout~ : could not allocate buffers." );
       return NULL;
    }
    memset( x->x_inbuffer, 0x0, INPUT_BUFFER_SIZE );

    x->x_outbuffersize = OUTPUT_BUFFER_SIZE;
    x->x_outbuffer = (char*) getbytes( x->x_outbuffersize );
    if ( !x->x_outbuffer )
    {
       post( "mp3fileout~ : could not allocate buffers." );
       return NULL;
    }
    memset( x->x_outbuffer, 0x0, OUTPUT_BUFFER_SIZE );
    x->x_outavable = 0;

    x->x_inwriteposition = 0;
    x->x_nbloops = 0;
    x->x_nbwaitloops = 1;

    return (x);
}

void mp3fileout_tilde_setup(void)
{
    post( mp3fileout_version );
    mp3fileout_class = class_new(gensym("mp3fileout~"), 
    	(t_newmethod) mp3fileout_new, (t_method) mp3fileout_free,
    	sizeof(t_mp3fileout),  0, A_NULL);

    class_addmethod(mp3fileout_class, nullfn, gensym("signal"), 0);
    class_addmethod(mp3fileout_class, (t_method) mp3fileout_dsp, gensym("dsp"), 0);
    class_addmethod(mp3fileout_class, (t_method)mp3fileout_connect, gensym("connect"), A_SYMBOL, A_FLOAT, 0);
    class_addmethod(mp3fileout_class, (t_method)mp3fileout_open, gensym("open"), A_SYMBOL, 0);
    class_addmethod(mp3fileout_class, (t_method)mp3fileout_disconnect, gensym("disconnect"), 0);
    class_addmethod(mp3fileout_class, (t_method)mp3fileout_start, gensym("start"), 0);
    class_addmethod(mp3fileout_class, (t_method)mp3fileout_resume, gensym("resume"), 0);
    class_addmethod(mp3fileout_class, (t_method)mp3fileout_seek, gensym("seek"), A_DEFFLOAT, 0);
    class_addmethod(mp3fileout_class, (t_method)mp3fileout_stop, gensym("stop"), 0);
    class_sethelpsymbol(mp3fileout_class, gensym("help-mp3live~.pd"));
}