Mercurial > SDL_sound_CoreAudio

changeset 297:e8d9255f1a42

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Renamed to mpglib_common.c
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 25 Mar 2002 20:51:15 +0000
parents d8c0315deba9
children c92c07e07636
files decoders/mpglib/common.c
diffstat 1 files changed, 0 insertions(+), 246 deletions(-) [+]
line wrap: on
line diff
--- a/decoders/mpglib/common.c	Mon Mar 25 08:39:11 2002 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,246 +0,0 @@
-#include <ctype.h>
-#include <stdlib.h>
-#include <signal.h>
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-
-#include "SDL_sound.h"
-
-#define __SDL_SOUND_INTERNAL__
-#include "SDL_sound_internal.h"
-
-#include "mpg123_sdlsound.h"
-
-struct parameter param = { 1 , 1 , 0 , 0 };
-
-int tabsel_123[2][3][16] = {
-   { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
-     {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
-     {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
-
-   { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
-     {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
-     {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
-};
-
-long mpglib_freqs[9] = { 44100, 48000, 32000,
-                         22050, 24000, 16000 ,
-                         11025 , 12000 , 8000 };
-
-int bitindex;
-unsigned char *wordpointer;
-unsigned char *pcm_sample;
-int pcm_point = 0;
-
-
-#define HDRCMPMASK 0xfffffd00
-
-#if 0
-int head_check(unsigned long head)
-{
-    if( (head & 0xffe00000) != 0xffe00000)
-	return FALSE;
-    if(!((head>>17)&3))
-	return FALSE;
-    if( ((head>>12)&0xf) == 0xf)
-	return FALSE;
-    if( ((head>>10)&0x3) == 0x3 )
-	return FALSE;
-    return TRUE;
-}
-#endif
-
-
-/*
- * the code a header and write the information
- * into the frame structure
- */
-int decode_header(struct frame *fr,unsigned long newhead)
-{
-    if( newhead & (1<<20) ) {
-      fr->lsf = (newhead & (1<<19)) ? 0x0 : 0x1;
-      fr->mpeg25 = 0;
-    }
-    else {
-      fr->lsf = 1;
-      fr->mpeg25 = 1;
-    }
-    
-    fr->lay = 4-((newhead>>17)&3);
-    if( ((newhead>>10)&0x3) == 0x3) {
-      Sound_SetError("MPGLIB: Corrupted header");
-      return 0;
-    }
-    if(fr->mpeg25) {
-      fr->sampling_frequency = 6 + ((newhead>>10)&0x3);
-    }
-    else
-      fr->sampling_frequency = ((newhead>>10)&0x3) + (fr->lsf*3);
-    fr->error_protection = ((newhead>>16)&0x1)^0x1;
-
-    if(fr->mpeg25) /* allow Bitrate change for 2.5 ... */
-      fr->bitrate_index = ((newhead>>12)&0xf);
-
-    fr->bitrate_index = ((newhead>>12)&0xf);
-    fr->padding   = ((newhead>>9)&0x1);
-    fr->extension = ((newhead>>8)&0x1);
-    fr->mode      = ((newhead>>6)&0x3);
-    fr->mode_ext  = ((newhead>>4)&0x3);
-    fr->copyright = ((newhead>>3)&0x1);
-    fr->original  = ((newhead>>2)&0x1);
-    fr->emphasis  = newhead & 0x3;
-
-    fr->stereo    = (fr->mode == MPG_MD_MONO) ? 1 : 2;
-
-    if(!fr->bitrate_index)
-    {
-      Sound_SetError("MPGLIB: Free format not supported.");
-      return (0);
-    }
-
-    switch(fr->lay)
-    {
-      case 1:
-#ifdef LAYER1
-#if 0
-        fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? 
-                         (fr->mode_ext<<2)+4 : 32;
-#endif
-        fr->framesize  = (long) tabsel_123[fr->lsf][0][fr->bitrate_index] * 12000;
-        fr->framesize /= mpglib_freqs[fr->sampling_frequency];
-        fr->framesize  = ((fr->framesize+fr->padding)<<2)-4;
-#else
-        Sound_SetError("MPGLIB: Not supported!");
-#endif
-        break;
-      case 2:
-#ifdef LAYER2
-#if 0
-        fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
-                         (fr->mode_ext<<2)+4 : fr->II_sblimit;
-#endif
-        fr->framesize = (long) tabsel_123[fr->lsf][1][fr->bitrate_index] * 144000;
-        fr->framesize /= mpglib_freqs[fr->sampling_frequency];
-        fr->framesize += fr->padding - 4;
-#else
-        Sound_SetError("MPGLIB: Not supported!");
-#endif
-        break;
-      case 3:
-#if 0
-        fr->do_layer = do_layer3;
-        if(fr->lsf)
-          ssize = (fr->stereo == 1) ? 9 : 17;
-        else
-          ssize = (fr->stereo == 1) ? 17 : 32;
-#endif
-
-#if 0
-        if(fr->error_protection)
-          ssize += 2;
-#endif
-          fr->framesize  = (long) tabsel_123[fr->lsf][2][fr->bitrate_index] * 144000;
-          fr->framesize /= mpglib_freqs[fr->sampling_frequency]<<(fr->lsf);
-          fr->framesize = fr->framesize + fr->padding - 4;
-        break; 
-      default:
-        Sound_SetError("MPGLIB: Unknown layer type.");
-        return (0);
-    }
-    return 1;
-}
-
-#if 0
-void print_header(struct frame *fr)
-{
-	static char *modes[4] = { "Stereo", "Joint-Stereo", "Dual-Channel", "Single-Channel" };
-	static char *layers[4] = { "Unknown" , "I", "II", "III" };
-
-	fprintf(stderr,"MPEG %s, Layer: %s, Freq: %ld, mode: %s, modext: %d, BPF : %d\n", 
-		fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"),
-		layers[fr->lay],mpglib_freqs[fr->sampling_frequency],
-		modes[fr->mode],fr->mode_ext,fr->framesize+4);
-	fprintf(stderr,"Channels: %d, copyright: %s, original: %s, CRC: %s, emphasis: %d.\n",
-		fr->stereo,fr->copyright?"Yes":"No",
-		fr->original?"Yes":"No",fr->error_protection?"Yes":"No",
-		fr->emphasis);
-	fprintf(stderr,"Bitrate: %d Kbits/s, Extension value: %d\n",
-		tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index],fr->extension);
-}
-
-void print_header_compact(struct frame *fr)
-{
-	static char *modes[4] = { "stereo", "joint-stereo", "dual-channel", "mono" };
-	static char *layers[4] = { "Unknown" , "I", "II", "III" };
- 
-	fprintf(stderr,"MPEG %s layer %s, %d kbit/s, %ld Hz %s\n",
-		fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"),
-		layers[fr->lay],
-		tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index],
-		mpglib_freqs[fr->sampling_frequency], modes[fr->mode]);
-}
-
-#endif
-
-unsigned int getbits(int number_of_bits)
-{
-  unsigned long rval;
-
-  if(!number_of_bits)
-    return 0;
-
-  {
-    rval = wordpointer[0];
-    rval <<= 8;
-    rval |= wordpointer[1];
-    rval <<= 8;
-    rval |= wordpointer[2];
-    rval <<= bitindex;
-    rval &= 0xffffff;
-
-    bitindex += number_of_bits;
-
-    rval >>= (24-number_of_bits);
-
-    wordpointer += (bitindex>>3);
-    bitindex &= 7;
-  }
-  return rval;
-}
-
-unsigned int getbits_fast(int number_of_bits)
-{
-  unsigned long rval;
-
-  {
-    rval = wordpointer[0];
-    rval <<= 8;	
-    rval |= wordpointer[1];
-    rval <<= bitindex;
-    rval &= 0xffff;
-    bitindex += number_of_bits;
-
-    rval >>= (16-number_of_bits);
-
-    wordpointer += (bitindex>>3);
-    bitindex &= 7;
-  }
-  return rval;
-}
-
-unsigned int get1bit(void)
-{
-  unsigned char rval;
-  rval = *wordpointer << bitindex;
-
-  bitindex++;
-  wordpointer += (bitindex>>3);
-  bitindex &= 7;
-
-  return rval>>7;
-}
-
-
-