utils/wxMMedia/sndwav.cpp

   1 ////////////////////////////////////////////////////////////////////////////////
   2 // Name:       sndwav.cpp
   3 // Purpose:    wxMMedia
   4 // Author:     Guilhem Lavaux
   5 // Created:    1997
   6 // Updated:    February 1998
   7 // Copyright:  (C) 1997, 1998, Guilhem Lavaux
   8 // License:    wxWindows license
   9 ////////////////////////////////////////////////////////////////////////////////
  10 #ifdef __GNUG__
  11 #pragma implementation "sndwav.h"
  12 #endif
  13
  14 #ifdef WX_PRECOMP
  15 #include "wx_prec.h"
  16 #else
  17 #include "wx/wx.h"
  18 #endif
  19 #include "sndwav.h"
  20 #include "sndfrmt.h"
  21 #include "sndpcm.h"
  22
  23 #ifdef __BORLANDC__
  24 #pragma hdrstop
  25 #endif
  26
  27 wxSndWavCodec::wxSndWavCodec()
  28   : wxSndFileCodec(), riff_codec()
  29 {
  30   m_sndtime.hours = -1;
  31 }
  32
  33 wxSndWavCodec::wxSndWavCodec(wxOutputStream& s, bool seekable)
  34   : wxSndFileCodec(s, seekable)
  35 {
  36   if (!seekable)
  37     CacheIO();
  38   riff_codec = wxRiffCodec(*m_ostream);
  39   m_sndtime.hours = -1;
  40 }
  41
  42 wxSndWavCodec::wxSndWavCodec(wxInputStream& s, bool preload, bool seekable)
  43   : wxSndFileCodec(s, preload, seekable)
  44 {
  45   if (!seekable)
  46     CacheIO();
  47
  48   riff_codec = wxRiffCodec(*m_istream);
  49   m_sndtime.hours = -1;
  50 }
  51
  52 wxSndWavCodec::wxSndWavCodec(const wxString& fname)
  53   : wxSndFileCodec(fname)
  54 {
  55   riff_codec = wxRiffCodec(*m_istream);
  56   m_sndtime.hours = -1;
  57 }
  58
  59 wxUint32 wxSndWavCodec::PrepareToPlay()
  60 {
  61   if (!riff_codec.RiffReset(RIFF_READ))
  62     return 0;
  63
  64   if (!riff_codec.FindChunk("RIFF", TRUE)) {
  65     wxSndFileCodec::m_mmerror = wxMMFILE_INVALID;
  66     return 0;
  67   }
  68
  69   char tmp_buf[5];
  70   riff_codec.ReadData(tmp_buf, 4);
  71   tmp_buf[4] = 0;
  72   if (wxString("WAVE") != tmp_buf) {
  73     wxSndFileCodec::m_mmerror = wxMMFILE_INVALID;
  74     return 0;
  75   }
  76   if (!riff_codec.FindChunk("fmt ", TRUE))
  77     return 0;
  78
  79   riff_codec.Read16(wav_hdr.format);
  80   riff_codec.Read16(wav_hdr.channels);
  81   riff_codec.Read32(wav_hdr.sample_fq);
  82   riff_codec.Read32(wav_hdr.byte_p_sec);
  83   riff_codec.Read16(wav_hdr.byte_p_spl);
  84   riff_codec.Read16(wav_hdr.bits_p_spl);
  85
  86   if (!riff_codec.FindChunk("data"))
  87     return 0;
  88
  89   m_sndmode = wxSND_OUTPUT;
  90   ChangeCodec(wav_hdr.format);
  91
  92   m_sndformat.SetSampleRate(wav_hdr.sample_fq);
  93   m_sndformat.SetBps(wav_hdr.bits_p_spl);
  94   m_sndformat.SetChannels(wav_hdr.channels);
  95
  96   if (wav_hdr.format == WXSOUND_PCM) {
  97     m_sndformat.SetSign(wxSND_SAMPLE_SIGNED);
  98     m_sndformat.SetByteOrder(wxSND_SAMPLE_LE);
  99   }
 100
 101   wxUint32 sec1 = riff_codec.GetChunkLength() / wav_hdr.byte_p_sec,
 102            sec2 = sec1 % 3600;
 103
 104   m_sndtime.hours = sec1 / 3600;
 105   m_sndtime.minutes = sec2 / 60;
 106   m_sndtime.seconds = sec2 % 60;
 107
 108   wxSndFileCodec::m_mmerror = wxMMFILE_NOERROR;
 109   wxSndFileCodec::m_fstate = wxSFILE_PREPARED_TO_PLAY;
 110
 111   return riff_codec.GetChunkLength();
 112 }
 113
 114 wxSndWavCodec::~wxSndWavCodec()
 115 {
 116 }
 117
 118 bool wxSndWavCodec::OnNeedData(char *buf, wxUint32 size)
 119 {
 120   return riff_codec.ReadData(buf, size);
 121 }
 122
 123 bool wxSndWavCodec::OnWriteData(char *buf, wxUint32 size)
 124 {
 125   return riff_codec.WriteData(buf, size);
 126 }
 127
 128 bool wxSndWavCodec::PrepareToRecord(wxUint32 m_fsize)
 129 {
 130   wxUint32 total_size;
 131
 132   if (!riff_codec.RiffReset(RIFF_WRITE))
 133     return FALSE;
 134
 135   total_size = 16 + sizeof(wav_hdr) + m_fsize;
 136
 137   if (!riff_codec.CreateChunk("RIFF", total_size))
 138     return FALSE;
 139   riff_codec.WriteData("WAVE", 4);
 140   if (!riff_codec.CreateChunk("fmt ", sizeof(wav_hdr)))
 141     return FALSE;
 142
 143   wav_hdr.format = m_sndformat.GetCodecNo(); // PCM_WAV_FORMAT
 144   wav_hdr.channels = m_sndformat.GetChannels();
 145   wav_hdr.sample_fq = m_sndformat.GetSampleRate();
 146   wav_hdr.byte_p_spl = (m_sndformat.GetBps() / 8) * wav_hdr.channels;
 147   wav_hdr.byte_p_sec = m_sndformat.GetCodec()->GetByteRate();
 148   wav_hdr.bits_p_spl = m_sndformat.GetBps();
 149
 150   if (wav_hdr.format == WXSOUND_PCM) {
 151     m_sndformat.SetSign(wxSND_SAMPLE_SIGNED);
 152     m_sndformat.SetByteOrder(wxSND_SAMPLE_LE);
 153   }
 154
 155   riff_codec.Write16(wav_hdr.format);
 156   riff_codec.Write16(wav_hdr.channels);
 157   riff_codec.Write32(wav_hdr.sample_fq);
 158   riff_codec.Write32(wav_hdr.byte_p_sec);
 159   riff_codec.Write16(wav_hdr.byte_p_spl);
 160   riff_codec.Write16(wav_hdr.bits_p_spl);
 161
 162   if (!riff_codec.CreateChunk("data", m_fsize))
 163     return FALSE;
 164   return TRUE;
 165 }
 166
 167 void wxSndWavCodec::SetFile(wxInputStream& s, bool preload, bool seekable)
 168 {
 169   wxMMediaFile::SetFile(s, preload, seekable);
 170   if (!seekable)
 171     CacheIO();
 172
 173   riff_codec.SetFile((seekable) ? s : *m_istream);
 174 }
 175
 176 void wxSndWavCodec::SetFile(wxOutputStream& s, bool seekable)
 177 {
 178   wxMMediaFile::SetFile(s, seekable);
 179   if (!seekable)
 180     CacheIO();
 181
 182   riff_codec.SetFile((seekable) ? s : *m_ostream);
 183 }