contrib/src/mmedia/sndmsad.cpp

   1 // --------------------------------------------------------------------------
   2 // Name: sndulaw.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 "sndmsad.cpp"
  10 #endif
  11
  12 #include "wx/wxprec.h"
  13
  14 #ifndef WX_PRECOMP
  15   #include "wx/defs.h"
  16   #include "wx/memory.h"
  17   #include "wx/log.h"
  18 #endif
  19
  20 #include "wx/mmedia/sndbase.h"
  21 #include "wx/mmedia/sndfile.h"
  22 #include "wx/mmedia/sndpcm.h"
  23 #include "wx/mmedia/sndmsad.h"
  24
  25 // --------------------------------------------------------------------------
  26 // wxSoundFormatMSAdpcm
  27 // --------------------------------------------------------------------------
  28
  29 wxSoundFormatMSAdpcm::wxSoundFormatMSAdpcm()
  30         : m_srate(22050)
  31 {
  32     m_ncoefs    = 0;
  33     m_coefs_len = 0;
  34     m_coefs     = NULL;
  35 }
  36
  37 wxSoundFormatMSAdpcm::~wxSoundFormatMSAdpcm()
  38 {
  39     if (m_ncoefs) {
  40         wxUint16 i;
  41
  42         for (i=0;i<m_ncoefs;i++)
  43             delete[] m_coefs[i];
  44         delete[] m_coefs;
  45     }
  46
  47 }
  48
  49 void wxSoundFormatMSAdpcm::SetSampleRate(wxUint32 srate)
  50 {
  51     m_srate = srate;
  52 }
  53
  54 wxUint32 wxSoundFormatMSAdpcm::GetSampleRate() const
  55 {
  56     return m_srate;
  57 }
  58
  59 void wxSoundFormatMSAdpcm::SetChannels(wxUint16 nchannels)
  60 {
  61     m_nchannels = nchannels;
  62 }
  63
  64 wxUint16 wxSoundFormatMSAdpcm::GetChannels() const
  65 {
  66     return m_nchannels;
  67 }
  68
  69 void wxSoundFormatMSAdpcm::SetCoefs(wxInt16 **WXUNUSED(coefs), wxUint16 ncoefs,
  70                                     wxUint16 coefs_len)
  71 {
  72     wxUint16 i;
  73
  74     if (m_ncoefs) {
  75         for (i=0;i<m_ncoefs;i++)
  76            delete[] (m_coefs[i]);
  77         delete[] m_coefs;
  78     }
  79     // TODO: Add some memory checking here
  80     m_coefs = new wxInt16 *[ncoefs];
  81
  82     for (i=0;i<ncoefs;i++)
  83        m_coefs[i] = new wxInt16[coefs_len];
  84
  85     m_ncoefs = ncoefs;
  86     m_coefs_len = coefs_len;
  87 }
  88
  89 void wxSoundFormatMSAdpcm::GetCoefs(wxInt16 **& coefs, wxUint16& ncoefs,
  90                                     wxUint16& coefs_len) const
  91 {
  92     coefs     = m_coefs;
  93     ncoefs    = m_ncoefs;
  94     coefs_len = m_coefs_len;
  95 }
  96
  97 void wxSoundFormatMSAdpcm::SetBlockSize(wxUint16 block_size)
  98 {
  99     m_block_size = block_size;
 100 }
 101
 102 wxUint16 wxSoundFormatMSAdpcm::GetBlockSize() const
 103 {
 104     return m_block_size;
 105 }
 106
 107 wxSoundFormatBase *wxSoundFormatMSAdpcm::Clone() const
 108 {
 109     wxSoundFormatMSAdpcm *adpcm = new wxSoundFormatMSAdpcm();
 110
 111     adpcm->m_srate       = m_srate;
 112     adpcm->SetCoefs(m_coefs, m_ncoefs, m_coefs_len);
 113     adpcm->m_nchannels   = m_nchannels;
 114     adpcm->m_block_size  = m_block_size;
 115     return adpcm;
 116 }
 117
 118 wxUint32 wxSoundFormatMSAdpcm::GetTimeFromBytes(wxUint32 bytes) const
 119 {
 120     return 2 * bytes / (m_nchannels * m_srate);
 121 }
 122
 123 wxUint32 wxSoundFormatMSAdpcm::GetBytesFromTime(wxUint32 time) const
 124 {
 125     return time * m_nchannels * m_srate / 2;
 126 }
 127
 128 bool wxSoundFormatMSAdpcm::operator !=(const wxSoundFormatBase& frmt2) const
 129 {
 130     const wxSoundFormatMSAdpcm *adpcm = (const wxSoundFormatMSAdpcm *)&frmt2;
 131
 132     if (frmt2.GetType() != wxSOUND_MSADPCM)
 133         return true;
 134
 135     return (adpcm->m_srate != m_srate) && (adpcm->m_nchannels != m_nchannels);
 136 }
 137
 138 // --------------------------------------------------------------------------
 139 // wxSoundStreamMSAdpcm
 140 // --------------------------------------------------------------------------
 141 wxSoundStreamMSAdpcm::wxSoundStreamMSAdpcm(wxSoundStream& sndio)
 142         : wxSoundStreamCodec(sndio)
 143 {
 144     // PCM converter
 145     m_router     = new wxSoundRouterStream(sndio);
 146     m_got_header = false;
 147     m_stereo = false;
 148 }
 149
 150 wxSoundStreamMSAdpcm::~wxSoundStreamMSAdpcm()
 151 {
 152     delete m_router;
 153 }
 154
 155 wxSoundStream& wxSoundStreamMSAdpcm::Read(void *WXUNUSED(buffer), wxUint32 WXUNUSED(len))
 156 {
 157     m_snderror = wxSOUND_NOCODEC;
 158     m_lastcount = 0;
 159     return *this;
 160 }
 161
 162 static wxInt16 gl_ADPCMcoeff_delta[] = {
 163     230, 230, 230, 230, 307, 409, 512, 614, 768, 614, 512, 409, 307,
 164     230, 230, 230
 165 };
 166
 167 wxUint32 wxSoundStreamMSAdpcm::DecodeMonoADPCM(const void *in_buffer,
 168                                                void *out_buffer,
 169                                                wxUint32 in_len)
 170 {
 171     wxUint8  *ADPCMdata;
 172     wxInt16  *PCMdata;
 173     AdpcmState *state;
 174     wxUint32 out_len;
 175
 176     ADPCMdata = (wxUint8 *)in_buffer;
 177     PCMdata   = (wxInt16 *)out_buffer;
 178     state     = &m_state[0];
 179
 180 #define GET_DATA_16(i) i = *ADPCMdata++, i |= ((wxUint32)(*ADPCMdata++) << 8)
 181 #define GET_DATA_8(i) i = (*ADPCMdata++)
 182
 183     out_len = 0;
 184     while (in_len != 0) {
 185         if (m_next_block == 0) {
 186             GET_DATA_8(state->predictor);
 187             GET_DATA_16(state->iDelta);
 188
 189             GET_DATA_16(state->samp1);
 190             GET_DATA_16(state->samp2);
 191
 192             state->coeff[0] = state->coeff[1] = m_coefs[0][ state->predictor ];
 193
 194             *PCMdata++ = state->samp2;
 195             *PCMdata++ = state->samp1;
 196             in_len     -= 7;
 197             out_len    += 4;
 198             m_next_block = m_block_size;
 199             continue;
 200         }
 201
 202         while (in_len != 0 && m_next_block != 0) {
 203             wxUint8 nib[2];
 204
 205             GET_DATA_8(nib[0]);
 206             nib[1] = (nib[0] >> 4) & 0x0f;
 207             nib[0] &= 0x0f;
 208
 209             Nibble(nib[0], state, &PCMdata);
 210             Nibble(nib[1], state, &PCMdata);
 211
 212             in_len       -= 4;
 213             out_len      += 4;
 214             m_next_block -= 4;
 215         }
 216     }
 217
 218     return out_len;
 219
 220 #undef GET_DATA_16
 221 #undef GET_DATA_8
 222 }
 223
 224 wxUint32 wxSoundStreamMSAdpcm::DecodeStereoADPCM(const void *in_buffer,
 225                                                  void *out_buffer,
 226                                                  wxUint32 in_len)
 227 {
 228     wxUint8  *ADPCMdata;
 229     wxInt16  *PCMdata;
 230     AdpcmState *state0, *state1;
 231     wxUint32 out_len;
 232
 233     ADPCMdata = (wxUint8 *)in_buffer;
 234     PCMdata   = (wxInt16 *)out_buffer;
 235
 236     state0 = &m_state[0];
 237     state1 = &m_state[1];
 238
 239 #define GET_DATA_16(i) i = *ADPCMdata++, i |= ((wxUint32)(*ADPCMdata++) << 8)
 240 #define GET_DATA_8(i) i = (*ADPCMdata++)
 241
 242     out_len = 0;
 243     while (in_len != 0) {
 244         if (!m_next_block) {
 245             GET_DATA_8(state0->predictor);
 246             GET_DATA_8(state1->predictor);
 247
 248             GET_DATA_16(state0->iDelta);
 249             GET_DATA_16(state1->iDelta);
 250
 251             GET_DATA_16(state0->samp1);
 252             GET_DATA_16(state1->samp1);
 253             GET_DATA_16(state0->samp2);
 254             GET_DATA_16(state1->samp2);
 255
 256             *PCMdata++ = state0->samp2;
 257             *PCMdata++ = state1->samp2;
 258             *PCMdata++ = state0->samp1;
 259             *PCMdata++ = state1->samp1;
 260
 261             in_len     -= 14;
 262             out_len    += 8;
 263             m_next_block = m_block_size;
 264             continue;
 265         }
 266
 267         while (in_len != 0 && m_next_block > 0) {
 268             wxUint8 nib[2];
 269
 270             GET_DATA_8(nib[0]);
 271             nib[1] = (nib[0] >> 4) & 0x0f;
 272             nib[0] &= 0x0f;
 273
 274             Nibble(nib[0], state0, &PCMdata);
 275             Nibble(nib[1], state1, &PCMdata);
 276
 277             in_len       -= 4;
 278             out_len      += 4;
 279             m_next_block -= 4;
 280         }
 281     }
 282
 283     return out_len;
 284
 285 #undef GET_DATA_16
 286 #undef GET_DATA_8
 287 }
 288
 289 void wxSoundStreamMSAdpcm::Nibble(wxInt8 nyb,
 290                                   AdpcmState *state,
 291                                   wxInt16 **out_buffer)
 292 {
 293     wxUint32 new_delta;
 294     wxInt32  new_sample;
 295
 296     // First: compute the next delta value
 297     new_delta  = (state->iDelta * gl_ADPCMcoeff_delta[nyb]) >> 8;
 298     // If null, minor it by 16
 299     if (!new_delta)
 300         new_delta = 16;
 301
 302     // Barycentre
 303     new_sample = (state->samp1 * state->coeff[0] +
 304                   state->samp2 * state->coeff[1]) / 256;
 305
 306     // Regenerate the sign
 307     if (nyb & 0x08)
 308         nyb -= 0x10;
 309
 310     new_sample += state->iDelta * nyb;
 311
 312     // Samples must be in [-32767, 32768]
 313     if (new_sample < -32768)
 314         new_sample = -32768;
 315     else if (new_sample > 32767)
 316         new_sample = 32767;
 317
 318     state->iDelta = new_delta;
 319     state->samp2  = state->samp1;
 320     state->samp1  = new_sample;
 321
 322     *(*out_buffer)++ = new_sample;
 323 }
 324
 325 wxSoundStream& wxSoundStreamMSAdpcm::Write(const void *buffer, wxUint32 len)
 326 {
 327     wxUint8 *out_buf;
 328     wxUint32 new_len;
 329
 330     // TODO: prealloc the output buffer
 331     out_buf = new wxUint8[len*2];
 332
 333     if (!m_stereo)
 334         new_len = DecodeMonoADPCM(buffer, out_buf, len);
 335     else
 336         new_len = DecodeStereoADPCM(buffer, out_buf, len);
 337
 338     m_router->Write(out_buf, new_len);
 339
 340     m_lastcount = len;
 341     m_snderror  = wxSOUND_NOERROR;
 342
 343     delete[] out_buf;
 344
 345     return *this;
 346 }
 347
 348 wxUint32 wxSoundStreamMSAdpcm::GetBestSize() const
 349 {
 350     return m_sndio->GetBestSize() / 2;
 351 }
 352
 353 bool wxSoundStreamMSAdpcm::SetSoundFormat(const wxSoundFormatBase& format)
 354 {
 355     if (format.GetType() != wxSOUND_MSADPCM) {
 356         m_snderror = wxSOUND_INVFRMT;
 357         return false;
 358     }
 359
 360     wxSoundFormatPcm pcm;
 361     wxSoundFormatMSAdpcm *adpcm;
 362     wxUint16 ncoefs, coefs_len;
 363
 364     wxSoundStreamCodec::SetSoundFormat(format);
 365
 366     adpcm = (wxSoundFormatMSAdpcm *)m_sndformat;
 367
 368     adpcm->GetCoefs(m_coefs, ncoefs, coefs_len);
 369
 370     if (!ncoefs) {
 371         wxLogError(wxT("Number of ADPCM coefficients must be non null"));
 372         return false;
 373     }
 374
 375     pcm.SetSampleRate(adpcm->GetSampleRate());
 376     pcm.SetBPS(16);
 377     pcm.SetChannels(adpcm->GetChannels());
 378     pcm.Signed(true);
 379     pcm.SetOrder(wxBYTE_ORDER);
 380
 381     m_stereo = (adpcm->GetChannels() == 2);
 382     m_block_size = adpcm->GetBlockSize();
 383     m_next_block = 0;
 384
 385     m_router->SetSoundFormat(pcm);
 386
 387     return true;
 388 }
 389