WDL/mp3write.h

   1 /*
   2     WDL - mp3write.h
   3     Copyright (C) 2005 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
  23 /*
  24
  25   This file provides a simple class for writing MP3 files (using lameencdec.h)
  26
  27 */
  28
  29
  30 #ifndef _MP3WRITE_H_
  31 #define _MP3WRITE_H_
  32
  33
  34 #include <stdio.h>
  35 #include "lameencdec.h"
  36
  37 class mp3Writer
  38 {
  39   public:
  40     // appending doesnt check sample types
  41     mp3Writer()
  42     {
  43       m_enc=0;
  44       m_fp=0;
  45       m_srate=0;
  46       m_nch=0;
  47     }
  48
  49     mp3Writer(char *filename, int nch, int srate, int bitrate, int allow_append=1)
  50     {
  51       m_enc=0;
  52       m_fp=0;
  53       m_srate=0;
  54       m_nch=0;
  55       Open(filename,nch,srate,bitrate,allow_append);
  56
  57     }
  58
  59     int Open(char *filename, int nch, int srate, int bitrate, int allow_append=1)
  60     {
  61       m_fp=0;
  62       if (allow_append)
  63       {
  64         m_fp=fopen(filename,"r+b");
  65         if (m_fp)
  66         {
  67           fseek(m_fp,0,SEEK_END);
  68         }
  69       }
  70       if (!m_fp)
  71       {
  72         m_fp=fopen(filename,"wb");
  73       }
  74       m_nch=nch>1?2:1;
  75       m_srate=srate;
  76       m_enc = new LameEncoder(srate,nch,bitrate);
  77       if (m_enc->Status())
  78       {
  79         delete m_enc;
  80         m_enc=0;
  81       }
  82       return m_fp && m_enc;
  83     }
  84
  85     ~mp3Writer()
  86     {
  87       if (m_fp)
  88       {
  89         if (m_enc)
  90         {
  91           m_enc->Encode(NULL,0);
  92           if (m_enc->outqueue.Available())
  93           {
  94             fwrite(m_enc->outqueue.Get(),1,m_enc->outqueue.GetSize(),m_fp);
  95             fflush(m_fp);
  96             m_enc->outqueue.Advance(m_enc->outqueue.GetSize());
  97             m_enc->outqueue.Compact();
  98           }
  99         }
 100
 101         fclose(m_fp);
 102         m_fp=0;
 103       }
 104       if (m_enc)
 105       {
 106         delete m_enc;
 107         m_enc=0;
 108       }
 109     }
 110
 111     int Status() { return m_enc && m_fp; }
 112
 113     void WriteFloats(float *samples, int nsamples)
 114     {
 115       if (!m_fp || !m_enc) return;
 116
 117       m_enc->Encode(samples,nsamples/m_nch);
 118       if (m_enc->outqueue.Available())
 119       {
 120         fwrite(m_enc->outqueue.Get(),1,m_enc->outqueue.GetSize(),m_fp);
 121         fflush(m_fp);
 122         m_enc->outqueue.Advance(m_enc->outqueue.GetSize());
 123         m_enc->outqueue.Compact();
 124       }
 125
 126     }
 127
 128     int get_nch() { return m_nch; }
 129     int get_srate() { return m_srate; }
 130
 131   private:
 132     FILE *m_fp;
 133     int m_nch,m_srate;
 134     LameEncoder *m_enc;
 135 };
 136
 137
 138 #endif//_MP3WRITE_H_