gstreamer/ext/mikmod/mikmod_reader.c

#include <unistd.h>
#include <string.h>

#include "gstmikmod.h"

extern int need_sync;

static BOOL GST_READER_Eof ( MREADER *reader );
static BOOL GST_READER_Read( MREADER *reader, void *ptr, size_t size );
static int  GST_READER_Get ( MREADER *reader );
static BOOL GST_READER_Seek( MREADER* reader,long offset,int whence );
static long GST_READER_Tell( MREADER* reader );


static BOOL GST_READER_Eof( MREADER *reader )
{
GST_READER *gst_reader;

  gst_reader = ( GST_READER * ) reader;

  return gst_reader->eof;
}


static BOOL GST_READER_Read( MREADER *reader, void *ptr, size_t size )
{
GST_READER *gst_reader;

  gst_reader = ( GST_READER * ) reader;
       
  memcpy( ptr, GST_BUFFER_DATA( gst_reader->mik->Buffer ) + gst_reader->offset, size);
  gst_reader->offset = gst_reader->offset + size;   

  return 1;
}


static int GST_READER_Get ( MREADER *reader )
{
GST_READER *gst_reader;
int res;

  gst_reader = ( GST_READER * ) reader;
        
  res = *( GST_BUFFER_DATA( gst_reader->mik->Buffer ) + gst_reader->offset );
  gst_reader->offset += 1;
        
  return res;
}


static BOOL GST_READER_Seek( MREADER *reader, long offset, int whence )
{
GST_READER *gst_reader;
    
  gst_reader = ( GST_READER * ) reader;

  if ( whence == SEEK_SET )
    gst_reader->offset = offset;
  else
    gst_reader->offset += offset;

  return 1;
}


static long GST_READER_Tell( MREADER *reader )
{
GST_READER *gst_reader;

  gst_reader = ( GST_READER * ) reader;

  return gst_reader->offset;
}


MREADER *GST_READER_new( GstMikMod *mik )
{
GST_READER *gst_reader;
	
  gst_reader = ( GST_READER * ) g_malloc( sizeof( GST_READER ));
  gst_reader->offset = 0;
  gst_reader->eof    = 0;
  gst_reader->mik    = mik;
  if ( gst_reader ) 
  {
     gst_reader->core.Eof  = &GST_READER_Eof;
     gst_reader->core.Read = &GST_READER_Read;
     gst_reader->core.Get  = &GST_READER_Get;
     gst_reader->core.Seek = &GST_READER_Seek;
     gst_reader->core.Tell = &GST_READER_Tell;
  }

  return ( MREADER *)gst_reader;
}


void GST_READER_free ( MREADER *reader )
{
  if ( reader ) 
    g_free( reader );
}