utils/wxMMedia2/lib/sndcpcm.cpp

   1 // --------------------------------------------------------------------------
   2 // Name: sndcpcm.cpp
   3 // Purpose:
   4 // Date: 08/11/1999
   5 // Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999
   6 // CVSID: $Id$
   7 // --------------------------------------------------------------------------
   8 #ifdef __GNUG__
   9 #pragma implementation "sndcpcm.cpp"
  10 #endif
  11
  12 #include <wx/wxprec.h>
  13 #include "sndbase.h"
  14 #include "sndpcm.h"
  15 #include "sndcpcm.h"
  16
  17 wxSoundStreamPcm::wxSoundStreamPcm(wxSoundStream& sndio)
  18  : wxSoundStreamCodec(sndio)
  19 {
  20   m_function_in = NULL;
  21   m_function_out = NULL;
  22 }
  23
  24 wxSoundStreamPcm::~wxSoundStreamPcm()
  25 {
  26 }
  27
  28
  29 #define SWAP_BYTES 0
  30 #include "converter.def"
  31 #undef SWAP_BYTES
  32
  33 #define SWAP_BYTES 1
  34 #include "converter.def"
  35 #undef SWAP_BYTES
  36
  37 wxSoundStreamPcm::ConverterType s_convert_out_16_to_8[] = {
  38   Convert_16to8_16_no,
  39   Convert_16to8_U2S_16_no,
  40   NULL,
  41   NULL,
  42   Convert_16to8_U2S_16_yes,
  43   Convert_16to8_16_yes
  44 };
  45
  46 wxSoundStreamPcm::ConverterType s_convert_out_16[] = {
  47   NULL,
  48   Convert_U2S_16_no,
  49   Convert_U2S_SWAP_16_no,
  50   Convert_U2S_SWAP_16_yes,
  51   Convert_U2S_16_yes,
  52   Convert_SWAP_16_no
  53 };
  54
  55 wxSoundStreamPcm::ConverterType s_convert_out_8[] = {
  56   NULL,
  57   Convert_U2S_8,
  58   Convert_U2S_8,
  59   Convert_U2S_8,
  60   Convert_U2S_8,
  61   NULL
  62 };
  63
  64 wxSoundStreamPcm::ConverterType s_convert_in_8_to_16[] = {
  65   Convert_8to16_8,
  66   Convert_8to16_U2S_8,
  67   Convert_8to16_U2S_SWAP_8,
  68   NULL,
  69   NULL,
  70   Convert_8to16_SWAP_8
  71 };
  72
  73 wxSoundStreamPcm::ConverterType *s_convert_in_16 = s_convert_out_16;
  74
  75 wxSoundStreamPcm::ConverterType *s_convert_in_8 = s_convert_out_8;
  76
  77 #define CONVERTER 0
  78 #define CONVERTER_SIGN 1
  79 #define CONVERTER_SIGN_SWAP 2
  80 #define CONVERTER_SWAP_SIGN_SWAP 3
  81 #define CONVERTER_SWAP_SIGN 4
  82 #define CONVERTER_SWAP 5
  83
  84 wxSoundStream& wxSoundStreamPcm::Read(void *buffer, wxUint32 len)
  85 {
  86   wxUint32 real_len;
  87   char *tmp_buf;
  88
  89   if (!m_function_in) {
  90     m_sndio->Read(buffer, len);
  91     m_lastcount = m_sndio->GetLastAccess();
  92     m_snderror = m_sndio->GetError();
  93     return *this;
  94   }
  95
  96   real_len = (m_16_to_8) ? len / 2 : len;
  97
  98   tmp_buf = new char[real_len];
  99
 100   m_sndio->Read(tmp_buf, real_len);
 101   m_lastcount = m_sndio->GetLastAccess();
 102   m_snderror = m_sndio->GetError();
 103   if (m_snderror != wxSOUND_NOERR)
 104     return *this;
 105
 106   m_function_in(tmp_buf, (char *)buffer, m_lastcount);
 107
 108   delete[] tmp_buf;
 109
 110   if (m_16_to_8)
 111     m_lastcount *= 2;
 112
 113   return *this;
 114 }
 115
 116 wxSoundStream& wxSoundStreamPcm::Write(const void *buffer, wxUint32 len)
 117 {
 118   char *tmp_buf;
 119   wxUint32 len2;
 120
 121   if (!m_function_out)
 122     return m_sndio->Write(buffer, len);
 123
 124   len2 = (m_16_to_8) ? len / 2 : len;
 125
 126   tmp_buf = new char[len2];
 127   m_function_out((const char *)buffer, tmp_buf, len);
 128   m_sndio->Write(tmp_buf, len);
 129   delete[] tmp_buf;
 130
 131   m_lastcount = (m_16_to_8) ?
 132                     (m_sndio->GetLastAccess() * 2) : m_sndio->GetLastAccess();
 133
 134   return *this;
 135 }
 136
 137 bool wxSoundStreamPcm::SetSoundFormat(const wxSoundFormatBase& format)
 138 {
 139   wxSoundFormatBase *new_format;
 140   wxSoundFormatPcm *pcm_format, *pcm_format2;
 141   ConverterType *current_table_out, *current_table_in;
 142   int index;
 143   bool change_sign;
 144
 145   if (m_sndio->SetSoundFormat(format)) {
 146     m_function_out = NULL;
 147     m_function_in = NULL;
 148     return TRUE;
 149   }
 150   if (format.GetType() != wxSOUND_PCM) {
 151     m_snderror = wxSOUND_INVFRMT;
 152     return FALSE;
 153   }
 154   if (m_sndformat)
 155     delete m_sndformat;
 156
 157   new_format = m_sndio->GetSoundFormat().Clone();
 158   pcm_format = (wxSoundFormatPcm *)&format;
 159   pcm_format2 = (wxSoundFormatPcm *)new_format;
 160
 161   m_16_to_8 = FALSE;
 162   if (pcm_format->GetBPS() != pcm_format2->GetBPS()) {
 163     m_16_to_8 = TRUE;
 164     current_table_out = s_convert_out_16_to_8;
 165     current_table_in  = s_convert_in_8_to_16;
 166   } else if (pcm_format->GetBPS() == 16) {
 167     current_table_out = s_convert_out_16;
 168     current_table_in  = s_convert_in_16;
 169   } else {
 170     current_table_out = s_convert_out_8;
 171     current_table_in  = s_convert_in_8;
 172   }
 173
 174   change_sign = (pcm_format2->Signed() != pcm_format->Signed());
 175
 176 #define MY_ORDER wxBYTE_ORDER
 177 #if wxBYTE_ORDER == wxLITTLE_ENDIAN
 178 #define OTHER_ORDER wxBIG_ENDIAN
 179 #else
 180 #define OTHER_ORDER wxLITTLE_ENDIAN
 181 #endif
 182
 183   if (pcm_format->GetOrder() == OTHER_ORDER &&
 184       pcm_format2->GetOrder() == OTHER_ORDER && change_sign)
 185     index = CONVERTER_SWAP_SIGN_SWAP;
 186
 187   else if (pcm_format->GetOrder() == OTHER_ORDER &&
 188            pcm_format2->GetOrder() == MY_ORDER && change_sign)
 189     index = CONVERTER_SWAP_SIGN;
 190
 191   else if (pcm_format->GetOrder() == MY_ORDER &&
 192            pcm_format->GetOrder() == OTHER_ORDER && change_sign)
 193     index = CONVERTER_SIGN_SWAP;
 194
 195   else if (!change_sign &&
 196            pcm_format->GetOrder() != pcm_format2->GetOrder())
 197     index = CONVERTER_SWAP;
 198
 199   else
 200     index = CONVERTER;
 201
 202   m_function_out = current_table_out[index];
 203   m_function_in  = current_table_in[index];
 204
 205   m_sndio->SetSoundFormat(*new_format);
 206   m_sndformat = new_format;
 207   return TRUE;
 208 }