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 "sndbase.h"
  13 #include "sndpcm.h"
  14 #include "sndcpcm.h"
  15
  16 wxSoundStreamPcm::wxSoundStreamPcm(wxSoundStream& sndio)
  17  : wxSoundStreamCodec(sndio)
  18 {
  19   m_function_in = NULL;
  20   m_function_out = NULL;
  21 }
  22
  23 wxSoundStreamPcm::~wxSoundStreamPcm()
  24 {
  25 }
  26
  27
  28 #define SWAP_BYTES 0
  29 #include "converter.def"
  30 #undef SWAP_BYTES
  31
  32 #define SWAP_BYTES 1
  33 #include "converter.def"
  34 #undef SWAP_BYTES
  35
  36 wxSoundStreamPcm::ConverterType s_convert_16_to_8[] = {
  37   Convert_16to8_16_no,
  38   Convert_16to8_U2S_16_no,
  39   NULL,
  40   NULL,
  41   Convert_16to8_U2S_16_yes,
  42   Convert_16to8_16_yes,
  43 };
  44
  45 wxSoundStreamPcm::ConverterType s_convert_16[] = {
  46   NULL,
  47   Convert_U2S_16_no,
  48   Convert_U2S_SWAP_16_no,
  49   Convert_U2S_SWAP_16_yes,
  50   Convert_U2S_16_yes,
  51   Convert_SWAP_16_no
  52 };
  53
  54 wxSoundStreamPcm::ConverterType s_convert_8[] = {
  55   NULL,
  56   Convert_U2S_8,
  57   Convert_U2S_8,
  58   Convert_U2S_8,
  59   Convert_U2S_8,
  60   NULL
  61 };
  62
  63 #define CONVERTER 0
  64 #define CONVERTER_SIGN 1
  65 #define CONVERTER_SIGN_SWAP 2
  66 #define CONVERTER_SWAP_SIGN_SWAP 3
  67 #define CONVERTER_SWAP_SIGN 4
  68 #define CONVERTER_SWAP 5
  69
  70 wxSoundStream& wxSoundStreamPcm::Read(void *buffer, size_t len)
  71 {
  72   if (!m_function_in) {
  73     m_sndio->Read(buffer, len);
  74     m_lastcount = m_sndio->GetLastAccess();
  75     m_snderror = m_sndio->GetError();
  76     return *this;
  77   }
  78
  79   // TODO
  80   m_sndio->Read(buffer, len);
  81   m_lastcount = m_sndio->GetLastAccess();
  82   m_snderror = m_sndio->GetError();
  83   return *this;
  84 }
  85
  86 wxSoundStream& wxSoundStreamPcm::Write(const void *buffer, size_t len)
  87 {
  88   char *tmp_buf;
  89   size_t len2;
  90
  91   if (!m_function_out)
  92     return m_sndio->Write(buffer, len);
  93
  94   len2 = (m_16_to_8) ? len / 2 : len;
  95
  96   tmp_buf = new char[len2];
  97   m_function_out((const char *)buffer, tmp_buf, len);
  98   m_sndio->Write(tmp_buf, len);
  99   delete[] tmp_buf;
 100
 101   m_lastcount = (m_16_to_8) ?
 102                     (m_sndio->GetLastAccess() * 2) : m_sndio->GetLastAccess();
 103
 104   return *this;
 105 }
 106
 107 bool wxSoundStreamPcm::SetSoundFormat(const wxSoundFormatBase& format)
 108 {
 109   wxSoundFormatBase *new_format;
 110   wxSoundFormatPcm *pcm_format, *pcm_format2;
 111   ConverterType *current_table;
 112   int index;
 113   bool change_sign;
 114
 115   if (m_sndio->SetSoundFormat(format)) {
 116     m_function_out = NULL;
 117     m_function_in = NULL;
 118     return TRUE;
 119   }
 120   if (format.GetType() != wxSOUND_PCM) {
 121     m_snderror = wxSOUND_INVFRMT;
 122     return FALSE;
 123   }
 124   if (m_sndformat)
 125     delete m_sndformat;
 126
 127   new_format = m_sndio->GetSoundFormat().Clone();
 128   pcm_format = (wxSoundFormatPcm *)&format;
 129   pcm_format2 = (wxSoundFormatPcm *)new_format;
 130
 131   m_16_to_8 = FALSE;
 132   if (pcm_format->GetBPS() == 16 && pcm_format2->GetBPS() == 8) {
 133     m_16_to_8 = TRUE;
 134     current_table = s_convert_16_to_8;
 135   } else if (pcm_format->GetBPS() == 16)
 136     current_table = s_convert_16;
 137   else
 138     current_table = s_convert_8;
 139
 140   change_sign = (pcm_format2->Signed() != pcm_format->Signed());
 141
 142 #define MY_ORDER wxBYTE_ORDER
 143 #if wxBYTE_ORDER == wxLITTLE_ENDIAN
 144 #define OTHER_ORDER wxBIG_ENDIAN
 145 #else
 146 #define OTHER_ORDER wxLITTLE_ENDIAN
 147 #endif
 148
 149   if (pcm_format->GetOrder() == OTHER_ORDER &&
 150       pcm_format2->GetOrder() == OTHER_ORDER && change_sign)
 151     index = CONVERTER_SWAP_SIGN_SWAP;
 152
 153   else if (pcm_format->GetOrder() == OTHER_ORDER &&
 154            pcm_format2->GetOrder() == MY_ORDER && change_sign)
 155     index = CONVERTER_SWAP_SIGN;
 156
 157   else if (pcm_format->GetOrder() == MY_ORDER &&
 158            pcm_format->GetOrder() == OTHER_ORDER && change_sign)
 159     index = CONVERTER_SIGN_SWAP;
 160
 161   else if (!change_sign &&
 162            pcm_format->GetOrder() != pcm_format2->GetOrder())
 163     index = CONVERTER_SWAP;
 164
 165   else
 166     index = CONVERTER;
 167
 168   m_function_out = current_table[index];
 169 //  m_function_in = current_table[index+1];
 170
 171   m_sndio->SetSoundFormat(*new_format);
 172   m_sndformat = new_format;
 173   return TRUE;
 174 }