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   Convert_U2S_S2M_8,
  64   Convert_U2S_S2M_8,
  65   Convert_U2S_S2M_8,
  66   Convert_U2S_S2M_8,
  67   Convert_S2M_8 */
  68 };
  69
  70 wxSoundStreamPcm::ConverterType s_convert_in_8_to_16[] = {
  71   Convert_8to16_8,
  72   Convert_8to16_U2S_8,
  73   Convert_8to16_U2S_SWAP_8,
  74   NULL,
  75   NULL,
  76   Convert_8to16_SWAP_8
  77 };
  78
  79 wxSoundStreamPcm::ConverterType *s_convert_in_16 = s_convert_out_16;
  80
  81 wxSoundStreamPcm::ConverterType *s_convert_in_8 = s_convert_out_8;
  82
  83 #define CONVERTER 0
  84 #define CONVERTER_SIGN 1
  85 #define CONVERTER_SIGN_SWAP 2
  86 #define CONVERTER_SWAP_SIGN_SWAP 3
  87 #define CONVERTER_SWAP_SIGN 4
  88 #define CONVERTER_SWAP 5
  89 #define CONVERTER_SIGN_STEREO_MONO 6
  90 #define CONVERTER_SIGN_SWAP_STEREO_MONO 7
  91 #define CONVERTER_SWAP_SIGN_SWAP_STEREO_MONO 8
  92 #define CONVERTER_SWAP_SIGN_STEREO_MONO 9
  93 #define CONVERTER_SWAP_STEREO_MONO 10
  94 #define CONVERTER_STEREO_MONO 11
  95
  96 //
  97 // TODO: Read() and Write() aren't really safe. If you give it a buffer which
  98 // is not aligned on 8, you may crash (See converter.def).
  99 //
 100
 101 wxSoundStream& wxSoundStreamPcm::Read(void *buffer, wxUint32 len)
 102 {
 103   wxUint32 real_len;
 104   char *tmp_buf;
 105
 106   if (!m_function_in) {
 107     m_sndio->Read(buffer, len);
 108     m_lastcount = m_sndio->GetLastAccess();
 109     m_snderror = m_sndio->GetError();
 110     return *this;
 111   }
 112
 113   real_len = (m_16_to_8) ? len / 2 : len;
 114
 115   tmp_buf = new char[real_len];
 116
 117   m_sndio->Read(tmp_buf, real_len);
 118   m_lastcount = m_sndio->GetLastAccess();
 119   m_snderror = m_sndio->GetError();
 120   if (m_snderror != wxSOUND_NOERR)
 121     return *this;
 122
 123   m_function_in(tmp_buf, (char *)buffer, m_lastcount);
 124
 125   delete[] tmp_buf;
 126
 127   if (m_16_to_8)
 128     m_lastcount *= 2;
 129
 130   return *this;
 131 }
 132
 133 wxSoundStream& wxSoundStreamPcm::Write(const void *buffer, wxUint32 len)
 134 {
 135   char *tmp_buf;
 136   wxUint32 len2;
 137
 138   if (!m_function_out)
 139     return m_sndio->Write(buffer, len);
 140
 141   len2 = (m_16_to_8) ? len / 2 : len;
 142
 143   tmp_buf = new char[len2];
 144   m_function_out((const char *)buffer, tmp_buf, len);
 145   m_sndio->Write(tmp_buf, len);
 146   delete[] tmp_buf;
 147
 148   m_lastcount = (m_16_to_8) ?
 149                     (m_sndio->GetLastAccess() * 2) : m_sndio->GetLastAccess();
 150
 151   return *this;
 152 }
 153
 154 bool wxSoundStreamPcm::SetSoundFormat(const wxSoundFormatBase& format)
 155 {
 156   wxSoundFormatBase *new_format;
 157   wxSoundFormatPcm *pcm_format, *pcm_format2;
 158   ConverterType *current_table_out, *current_table_in;
 159   int index;
 160   bool change_sign;
 161
 162   if (m_sndio->SetSoundFormat(format)) {
 163     m_function_out = NULL;
 164     m_function_in = NULL;
 165     return TRUE;
 166   }
 167   if (format.GetType() != wxSOUND_PCM) {
 168     m_snderror = wxSOUND_INVFRMT;
 169     return FALSE;
 170   }
 171   if (m_sndformat)
 172     delete m_sndformat;
 173
 174   new_format = m_sndio->GetSoundFormat().Clone();
 175   pcm_format = (wxSoundFormatPcm *)&format;
 176   pcm_format2 = (wxSoundFormatPcm *)new_format;
 177
 178   m_16_to_8 = FALSE;
 179   if (pcm_format->GetBPS() != pcm_format2->GetBPS()) {
 180     m_16_to_8 = TRUE;
 181     current_table_out = s_convert_out_16_to_8;
 182     current_table_in  = s_convert_in_8_to_16;
 183   } else if (pcm_format->GetBPS() == 16) {
 184     current_table_out = s_convert_out_16;
 185     current_table_in  = s_convert_in_16;
 186   } else {
 187     current_table_out = s_convert_out_8;
 188     current_table_in  = s_convert_in_8;
 189   }
 190
 191   change_sign = (pcm_format2->Signed() != pcm_format->Signed());
 192
 193 #define MY_ORDER wxBYTE_ORDER
 194 #if wxBYTE_ORDER == wxLITTLE_ENDIAN
 195 #define OTHER_ORDER wxBIG_ENDIAN
 196 #else
 197 #define OTHER_ORDER wxLITTLE_ENDIAN
 198 #endif
 199
 200   if (pcm_format->GetOrder() == OTHER_ORDER &&
 201       pcm_format2->GetOrder() == OTHER_ORDER && change_sign)
 202     index = CONVERTER_SWAP_SIGN_SWAP;
 203
 204   else if (pcm_format->GetOrder() == OTHER_ORDER &&
 205            pcm_format2->GetOrder() == MY_ORDER && change_sign)
 206     index = CONVERTER_SWAP_SIGN;
 207
 208   else if (pcm_format->GetOrder() == MY_ORDER &&
 209            pcm_format->GetOrder() == OTHER_ORDER && change_sign)
 210     index = CONVERTER_SIGN_SWAP;
 211
 212   else if (!change_sign &&
 213            pcm_format->GetOrder() != pcm_format2->GetOrder())
 214     index = CONVERTER_SWAP;
 215
 216   else
 217     index = CONVERTER;
 218
 219   m_function_out = current_table_out[index];
 220   m_function_in  = current_table_in[index];
 221
 222   m_sndio->SetSoundFormat(*new_format);
 223   m_sndformat = new_format;
 224   return TRUE;
 225 }