From bb0e90b4f73cf42e5dbda52b1ae3dc4ffd995b9c Mon Sep 17 00:00:00 2001
From: arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Thu, 24 Jul 2003 22:12:59 +0000
Subject: layer-1 support

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10469 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 mp3lib/layer1.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 mp3lib/sr1.c    |  10 ++--
 2 files changed, 162 insertions(+), 5 deletions(-)
 create mode 100644 mp3lib/layer1.c

(limited to 'mp3lib')

diff --git a/mp3lib/layer1.c b/mp3lib/layer1.c
new file mode 100644
index 0000000000..4af0933823
--- /dev/null
+++ b/mp3lib/layer1.c
@@ -0,0 +1,157 @@
+/* 
+ * Mpeg Layer-1 audio decoder 
+ * --------------------------
+ * copyright (c) 1995 by Michael Hipp, All rights reserved. See also 'README'
+ * near unoptimzed ...
+ *
+ * may have a few bugs after last optimization ... 
+ *
+ */
+
+//#include "mpg123.h"
+
+static void I_step_one(unsigned int balloc[], unsigned int scale_index[2][SBLIMIT],struct frame *fr)
+{
+  unsigned int *ba=balloc;
+  unsigned int *sca = (unsigned int *) scale_index;
+
+  if(fr->stereo) {
+    int i;
+    int jsbound = fr->jsbound;
+    for (i=0;i<jsbound;i++) { 
+      *ba++ = getbits(4);
+      *ba++ = getbits(4);
+    }
+    for (i=jsbound;i<SBLIMIT;i++)
+      *ba++ = getbits(4);
+
+    ba = balloc;
+
+    for (i=0;i<jsbound;i++) {
+      if ((*ba++))
+        *sca++ = getbits(6);
+      if ((*ba++))
+        *sca++ = getbits(6);
+    }
+    for (i=jsbound;i<SBLIMIT;i++)
+      if ((*ba++)) {
+        *sca++ =  getbits(6);
+        *sca++ =  getbits(6);
+      }
+  }
+  else {
+    int i;
+    for (i=0;i<SBLIMIT;i++)
+      *ba++ = getbits(4);
+    ba = balloc;
+    for (i=0;i<SBLIMIT;i++)
+      if ((*ba++))
+        *sca++ = getbits(6);
+  }
+}
+
+static void I_step_two(real fraction[2][SBLIMIT],unsigned int balloc[2*SBLIMIT],
+	unsigned int scale_index[2][SBLIMIT],struct frame *fr)
+{
+  int i,n;
+  int smpb[2*SBLIMIT]; /* values: 0-65535 */
+  int *sample;
+  register unsigned int *ba;
+  register unsigned int *sca = (unsigned int *) scale_index;
+
+  if(fr->stereo) {
+    int jsbound = fr->jsbound;
+    register real *f0 = fraction[0];
+    register real *f1 = fraction[1];
+    ba = balloc;
+    for (sample=smpb,i=0;i<jsbound;i++)  {
+      if ((n = *ba++))
+        *sample++ = getbits(n+1);
+      if ((n = *ba++))
+        *sample++ = getbits(n+1);
+    }
+    for (i=jsbound;i<SBLIMIT;i++) 
+      if ((n = *ba++))
+        *sample++ = getbits(n+1);
+
+    ba = balloc;
+    for (sample=smpb,i=0;i<jsbound;i++) {
+      if((n=*ba++))
+        *f0++ = (real) ( ((-1)<<n) + (*sample++) + 1) * muls[n+1][*sca++];
+      else
+        *f0++ = 0.0;
+      if((n=*ba++))
+        *f1++ = (real) ( ((-1)<<n) + (*sample++) + 1) * muls[n+1][*sca++];
+      else
+        *f1++ = 0.0;
+    }
+    for (i=jsbound;i<SBLIMIT;i++) {
+      if ((n=*ba++)) {
+        real samp = ( ((-1)<<n) + (*sample++) + 1);
+        *f0++ = samp * muls[n+1][*sca++];
+        *f1++ = samp * muls[n+1][*sca++];
+      }
+      else
+        *f0++ = *f1++ = 0.0;
+    }
+    for(i=fr->down_sample_sblimit;i<32;i++)
+      fraction[0][i] = fraction[1][i] = 0.0;
+  }
+  else {
+    register real *f0 = fraction[0];
+    ba = balloc;
+    for (sample=smpb,i=0;i<SBLIMIT;i++)
+      if ((n = *ba++))
+        *sample++ = getbits(n+1);
+    ba = balloc;
+    for (sample=smpb,i=0;i<SBLIMIT;i++) {
+      if((n=*ba++))
+        *f0++ = (real) ( ((-1)<<n) + (*sample++) + 1) * muls[n+1][*sca++];
+      else
+        *f0++ = 0.0;
+    }
+    for(i=fr->down_sample_sblimit;i<32;i++)
+      fraction[0][i] = 0.0;
+  }
+}
+
+static int do_layer1(struct frame *fr,int single)
+{
+  int clip=0;
+  int i,stereo = fr->stereo;
+  unsigned int balloc[2*SBLIMIT];
+  unsigned int scale_index[2][SBLIMIT];
+  real fraction[2][SBLIMIT];
+//  int single = fr->single;
+
+//  printf("do_layer1(0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X )\n",
+//    wordpointer[0],wordpointer[1],wordpointer[2],wordpointer[3],wordpointer[4],wordpointer[5],wordpointer[6],wordpointer[7]);
+
+  fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? 
+                         (fr->mode_ext<<2)+4 : 32;
+
+  if(stereo == 1 || single == 3)
+    single = 0;
+
+  I_step_one(balloc,scale_index,fr);
+
+  for (i=0;i<SCALE_BLOCK;i++)
+  {
+    I_step_two(fraction,balloc,scale_index,fr);
+
+    if(single >= 0)
+    {
+      clip += (fr->synth_mono)( (real *) fraction[single],pcm_sample,&pcm_point);
+    }
+    else {
+        int p1 = pcm_point;
+        clip += (fr->synth)( (real *) fraction[0],0,pcm_sample,&p1);
+        clip += (fr->synth)( (real *) fraction[1],1,pcm_sample,&pcm_point);
+    }
+
+  }
+
+  return clip;
+}
+
+
diff --git a/mp3lib/sr1.c b/mp3lib/sr1.c
index cdd07bcdd0..760b95ce68 100644
--- a/mp3lib/sr1.c
+++ b/mp3lib/sr1.c
@@ -271,8 +271,9 @@ switch(fr->lay){
     MP3_samplerate=freqs[fr->sampling_frequency];
     fr->framesize  = (long) MP3_bitrate * 12000;
     fr->framesize /= MP3_samplerate;
-    MP3_framesize  = fr->framesize;
-    fr->framesize  = ((fr->framesize+fr->padding)<<2)-4;
+    MP3_framesize  = ((fr->framesize+fr->padding)<<2);
+    fr->framesize  = MP3_framesize-4;
+    printf("framesize=%d\n",fr->framesize);
     break;
   default:
     MP3_framesize=fr->framesize=0;
@@ -375,6 +376,7 @@ int _has_mmx = 0;  // used by layer2.c, layer3.c to pre-scale coeffs
 
 #include "layer2.c"
 #include "layer3.c"
+#include "layer1.c"
 
 /******************************************************************************/
 /*           PUBLIC FUNCTIONS                  */
@@ -516,9 +518,7 @@ int MP3_DecodeFrame(unsigned char *hova,short single){
    switch(fr.lay){
      case 2: do_layer2(&fr,single);break;
      case 3: do_layer3(&fr,single);break;
-     case 1:
-         printf("mp3lib: layer-1 audio not yet supported!\n");
-	 return 4608;
+     case 1: do_layer1(&fr,single);break;
      default:
          return 0;	// unsupported
    }
-- 
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