Initial revision

CVS patchset: 1
CVS date: 2001/04/18 22:33:39

1 files changed, 157 insertions, 0 deletions

diff --git a/src/libmpg123/interface.c b/src/libmpg123/interface.c
new file mode 100644
index 000000000..8f6a2118f
--- /dev/null
+++ b/src/libmpg123/interface.c
@@ -0,0 +1,157 @@
+/* 
+ * Copyright (C) 2000 the xine project
+ * 
+ * This file is part of xine, a unix video player.
+ * The code is heavily based on libmpeg from mpg123
+ * 
+ * xine 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.
+ * 
+ * xine 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
+ *
+ * $Id: interface.c,v 1.1 2001/04/18 22:34:36 f1rmb Exp $
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "mpg123.h"
+#include "mpglib.h"
+
+void mpg_audio_reset (mpgaudio_t *mp) {
+
+  mp->framesize             = 0;
+  mp->framesize_old         = -1;
+  mp->bsize                 =  0;
+  mp->fr.single             = -1;
+  mp->bsnum                 =  0;
+  mp->synth_bo              =  1;
+  mp->is_output_initialized =  0;
+  mp->header                =  0;
+}
+
+mpgaudio_t *mpg_audio_init (ao_functions_t *ao_output) 
+{
+  mpgaudio_t *mp;
+
+  mp = malloc (sizeof(struct mpstr));
+  memset(mp, 0, sizeof(struct mpstr));
+
+  make_decode_tables(32767);
+  init_layer2();
+  init_layer3(SBLIMIT);
+
+  mp->ao_output = ao_output;
+
+  return mp;
+}
+
+int head_check(struct mpstr *mp)
+{
+  if( (mp->header & 0xffe00000) != 0xffe00000)
+    return 0;
+  if(!((mp->header>>17)&3))
+    return 0;
+  if( ((mp->header>>12)&0xf) == 0xf)
+    return 0;
+  if( ((mp->header>>10)&0x3) == 0x3 )
+    return 0;
+  return 1;
+}
+
+void mpg_audio_decode_data (mpgaudio_t *mp, uint8_t *data, uint8_t *data_end,
+			    uint32_t pts) 
+{
+  /* printf ("mpg123: decoding package\n"); */
+
+  uint32_t pts_for_package = 0;
+
+  /* pts = 0; */
+  
+  while (1) {
+    /* sync */
+    if(mp->framesize == 0) {
+      
+      /* printf ("mpg123: looking for header\n"); */
+
+      while (!head_check (mp)) {
+	    
+	if (data == data_end) 
+	  return;
+	    
+	mp->header = (mp->header << 8) | *data;
+	data++;
+      }
+
+      /* decode header */
+
+      decode_header(&mp->fr,mp->header);
+
+      mp->framesize = mp->fr.framesize;
+      mp->bsize = 0;
+      mpg123_wordpointer = mp->bsspace[mp->bsnum] + 512;
+      mp->bsnum = (mp->bsnum + 1) & 0x1;
+      mpg123_bitindex = 0;
+      pts_for_package = pts;
+      pts = 0;
+    }
+  
+
+    /* printf ("mpg123: copying data\n"); */
+    /* copy data to bsspace */
+    while (mp->bsize<mp->framesize) {
+
+      if (data == data_end)
+	return;
+
+      *(mpg123_wordpointer + mp->bsize) = *data;
+      data++;
+      mp->bsize++;
+    }
+
+    if(mp->fr.error_protection)
+      getbits(16);
+    
+    /* printf ("layer : %d\n",mp->fr.lay);  */
+    switch(mp->fr.lay) {
+    case 1:
+      do_layer1(mp, pts_for_package);
+      break;
+    case 2:
+      do_layer2(mp, pts_for_package);
+      break;
+    case 3:
+      do_layer3(mp, pts_for_package);
+      break;
+    }
+
+    mp->framesize_old = mp->framesize;
+    mp->framesize = 0;
+    mp->header = 0;
+    pts_for_package = 0;
+  }
+}
+
+int set_pointer(mpgaudio_t *mp, long backstep)
+{
+  unsigned char *bsbufold;
+  if(mp->framesize_old < 0 && backstep > 0) {
+    fprintf(stderr,"Can't step back %ld!\n",backstep);
+    return 0;
+  }
+  bsbufold = mp->bsspace[mp->bsnum] + 512;
+  mpg123_wordpointer -= backstep;
+  if (backstep)
+    memcpy(mpg123_wordpointer,bsbufold+mp->framesize_old-backstep,backstep);
+  mpg123_bitindex = 0;
+  return 1;
+}