--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/decoders/mpglib/interface.c	Thu Feb 21 19:46:09 2002 +0000
@@ -0,0 +1,229 @@
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "mpg123_sdlsound.h"
+#include "mpglib_sdlsound.h"
+
+/* Global mp .. it's a hack */
+struct mpstr *gmp;
+
+
+BOOL InitMP3(struct mpstr *mp) 
+{
+	static int init = 0;
+
+	memset(mp,0,sizeof(struct mpstr));
+
+	mp->framesize = 0;
+	mp->fsizeold = -1;
+	mp->bsize = 0;
+	mp->head = mp->tail = NULL;
+	mp->fr.single = -1;
+	mp->bsnum = 0;
+	mp->synth_bo = 1;
+
+	if(!init) {
+		init = 1;
+		make_decode_tables(32767);
+		init_layer2();
+		init_layer3(SBLIMIT);
+	}
+
+	return !0;
+}
+
+void ExitMP3(struct mpstr *mp)
+{
+	struct buf *b,*bn;
+	
+	b = mp->tail;
+	while(b) {
+		free(b->pnt);
+		bn = b->next;
+		free(b);
+		b = bn;
+	}
+}
+
+static struct buf *addbuf(struct mpstr *mp,char *buf,int size)
+{
+	struct buf *nbuf;
+
+	nbuf = malloc( sizeof(struct buf) );
+	if(!nbuf) {
+		fprintf(stderr,"Out of memory!\n");
+		return NULL;
+	}
+	nbuf->pnt = malloc(size);
+	if(!nbuf->pnt) {
+		free(nbuf);
+		return NULL;
+	}
+	nbuf->size = size;
+	memcpy(nbuf->pnt,buf,size);
+	nbuf->next = NULL;
+	nbuf->prev = mp->head;
+	nbuf->pos = 0;
+
+	if(!mp->tail) {
+		mp->tail = nbuf;
+	}
+	else {
+	  mp->head->next = nbuf;
+	}
+
+	mp->head = nbuf;
+	mp->bsize += size;
+
+	return nbuf;
+}
+
+static void remove_buf(struct mpstr *mp)
+{
+  struct buf *buf = mp->tail;
+  
+  mp->tail = buf->next;
+  if(mp->tail)
+    mp->tail->prev = NULL;
+  else {
+    mp->tail = mp->head = NULL;
+  }
+  
+  free(buf->pnt);
+  free(buf);
+
+}
+
+static int read_buf_byte(struct mpstr *mp)
+{
+	unsigned int b;
+
+	int pos;
+
+	pos = mp->tail->pos;
+	while(pos >= mp->tail->size) {
+		remove_buf(mp);
+		pos = mp->tail->pos;
+		if(!mp->tail) {
+			fprintf(stderr,"Fatal error!\n");
+			exit(1);
+		}
+	}
+
+	b = mp->tail->pnt[pos];
+	mp->bsize--;
+	mp->tail->pos++;
+	
+
+	return b;
+}
+
+static void read_head(struct mpstr *mp)
+{
+	unsigned long head;
+
+	head = read_buf_byte(mp);
+	head <<= 8;
+	head |= read_buf_byte(mp);
+	head <<= 8;
+	head |= read_buf_byte(mp);
+	head <<= 8;
+	head |= read_buf_byte(mp);
+
+	mp->header = head;
+}
+
+int decodeMP3(struct mpstr *mp,char *in,int isize,char *out,
+		int osize,int *done)
+{
+	int len;
+
+	gmp = mp;
+
+	if(osize < 4608) {
+		fprintf(stderr,"To less out space\n");
+		return MP3_ERR;
+	}
+
+	if(in) {
+		if(addbuf(mp,in,isize) == NULL) {
+			return MP3_ERR;
+		}
+	}
+
+	/* First decode header */
+	if(mp->framesize == 0) {
+		if(mp->bsize < 4) {
+			return MP3_NEED_MORE;
+		}
+		read_head(mp);
+		decode_header(&mp->fr,mp->header);
+		mp->framesize = mp->fr.framesize;
+	}
+
+	if(mp->fr.framesize > mp->bsize)
+		return MP3_NEED_MORE;
+
+	wordpointer = mp->bsspace[mp->bsnum] + 512;
+	mp->bsnum = (mp->bsnum + 1) & 0x1;
+	bitindex = 0;
+
+	len = 0;
+	while(len < mp->framesize) {
+		int nlen;
+		int blen = mp->tail->size - mp->tail->pos;
+		if( (mp->framesize - len) <= blen) {
+                  nlen = mp->framesize-len;
+		}
+		else {
+                  nlen = blen;
+                }
+		memcpy(wordpointer+len,mp->tail->pnt+mp->tail->pos,nlen);
+                len += nlen;
+                mp->tail->pos += nlen;
+		mp->bsize -= nlen;
+                if(mp->tail->pos == mp->tail->size) {
+                   remove_buf(mp);
+                }
+	}
+
+	*done = 0;
+	if(mp->fr.error_protection)
+           getbits(16);
+        switch(mp->fr.lay) {
+          case 1:
+	    do_layer1(&mp->fr,(unsigned char *) out,done);
+            break;
+          case 2:
+	    do_layer2(&mp->fr,(unsigned char *) out,done);
+            break;
+          case 3:
+	    do_layer3(&mp->fr,(unsigned char *) out,done);
+            break;
+        }
+
+	mp->fsizeold = mp->framesize;
+	mp->framesize = 0;
+
+	return MP3_OK;
+}
+
+int set_pointer(long backstep)
+{
+  unsigned char *bsbufold;
+  if(gmp->fsizeold < 0 && backstep > 0) {
+    fprintf(stderr,"Can't step back %ld!\n",backstep);
+    return MP3_ERR;
+  }
+  bsbufold = gmp->bsspace[gmp->bsnum] + 512;
+  wordpointer -= backstep;
+  if (backstep)
+    memcpy(wordpointer,bsbufold+gmp->fsizeold-backstep,backstep);
+  bitindex = 0;
+  return MP3_OK;
+}
+
+
+
+