WDL/lameencdec.h

   1 /*
   2   WDL - lameencdec.h
   3   Copyright (C) 2005 and later Cockos Incorporated
   4
   5   This software is provided 'as-is', without any express or implied
   6   warranty.  In no event will the authors be held liable for any damages
   7   arising from the use of this software.
   8
   9   Permission is granted to anyone to use this software for any purpose,
  10   including commercial applications, and to alter it and redistribute it
  11   freely, subject to the following restrictions:
  12
  13   1. The origin of this software must not be misrepresented; you must not
  14      claim that you wrote the original software. If you use this software
  15      in a product, an acknowledgment in the product documentation would be
  16      appreciated but is not required.
  17   2. Altered source versions must be plainly marked as such, and must not be
  18      misrepresented as being the original software.
  19   3. This notice may not be removed or altered from any source distribution.
  20
  21
  22   This file provides a simple interface for using lame_enc.dll on Windows for MP3 encoding and decoding.
  23
  24 */
  25
  26
  27 #ifndef _LAMEENCDEC_H_
  28 #define _LAMEENCDEC_H_
  29
  30 #include "queue.h"
  31 #include "wdlstring.h"
  32
  33 #ifdef _WIN32
  34   #ifndef _WIN64
  35     #define USE_LAME_BLADE_API
  36   #endif
  37 #endif
  38
  39 #ifndef USE_LAME_BLADE_API
  40   #define DYNAMIC_LAME
  41
  42   #ifdef DYNAMIC_LAME
  43     typedef void *lame_t;
  44   #else
  45     #include <lame/lame.h>
  46   #endif
  47 #endif
  48
  49
  50
  51 class LameEncoder
  52 {
  53   public:
  54
  55     LameEncoder(int srate, int nch, int bitrate, int stereomode = 1, int quality = 0, int vbrmethod = -1, int vbrquality = 2, int vbrmax = 320, int abr = 128);
  56     ~LameEncoder();
  57
  58     int Status() { return errorstat; } // 1=no dll, 2=error
  59
  60     void Encode(float *in, int in_spls, int spacing=1);
  61
  62     WDL_Queue outqueue;
  63
  64     void reinit()
  65     {
  66       spltmp[0].Advance(spltmp[0].Available());
  67       spltmp[0].Compact();
  68       spltmp[1].Advance(spltmp[1].Available());
  69       spltmp[1].Compact();
  70     }
  71
  72     static bool CheckDLL(); // returns true if dll is present
  73     static void InitDLL(const char *extrapath=NULL); // call with extrapath != NULL if you want to try loading from another path
  74
  75     void SetVBRFilename(const char *fn)
  76     {
  77       m_vbrfile.Set(fn);
  78     }
  79
  80     int GetNumChannels() { return m_encoder_nch; }
  81
  82   private:
  83     int m_nch,m_encoder_nch;
  84     WDL_Queue spltmp[2];
  85     WDL_HeapBuf outtmp;
  86     WDL_String m_vbrfile;
  87     int errorstat;
  88     int in_size_samples;
  89 #ifdef USE_LAME_BLADE_API
  90     UINT_PTR hbeStream;
  91 #else
  92     lame_t m_lamestate;
  93 #endif
  94 };
  95
  96 class LameDecoder
  97 {
  98   public:
  99     LameDecoder();
 100     ~LameDecoder();
 101
 102     int GetSampleRate() { return m_srate?m_srate:48000; }
 103     int GetNumChannels() { return m_nch?m_nch:1; }
 104
 105     WDL_HeapBuf m_samples; // we let the size get as big as it needs to, so we don't worry about tons of mallocs/etc
 106     int m_samples_used;
 107
 108     void *DecodeGetSrcBuffer(int srclen)
 109     {
 110       if (srctmp.GetSize() < srclen) srctmp.Resize(srclen);
 111       return srctmp.Get();
 112     }
 113     void DecodeWrote(int srclen);
 114
 115     int GetError() { return errorstat; }
 116
 117     void Reset();
 118
 119     int m_samplesdec;
 120
 121   private:
 122     WDL_HeapBuf srctmp;
 123     int errorstat;
 124     int m_srate,m_nch;
 125     int m_samples_remove;
 126
 127 #ifdef USE_LAME_BLADE_API
 128     void *decinst;
 129 #else
 130     lame_t *decinst;
 131 #endif
 132 };
 133
 134
 135
 136 #endif