projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| 2a040d3f GL |
1 | //////////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: sndmulaw.cpp | |
| 3 | // Purpose: wxMMedia | |
| 4 | // Author: Guilhem Lavaux | |
| 5 | // Created: 1997 | |
| 6 | // Updated: December 1998 | |
| 7 | // Copyright: (C) 1997, 1998, Guilhem Lavaux | |
| 8 | // License: wxWindows license | |
| 9 | //////////////////////////////////////////////////////////////////////////////// | |
| 4d6306eb GL |
10 | #ifdef __GNUG__ |
| 11 | #pragma implementation "sndmulaw.h" | |
| 12 | #endif | |
| 13 | ||
| 14 | #include "sndsnd.h" | |
| 15 | #include "sndfrmt.h" | |
| 16 | #include "sndmulaw.h" | |
| 17 | #include "adpcm/g72x.h" | |
| 18 | ||
| 19 | wxSoundMulawCodec::wxSoundMulawCodec() | |
| 20 | : wxSoundCodec() | |
| 21 | { | |
| 22 | } | |
| 23 | ||
| 24 | wxSoundMulawCodec::~wxSoundMulawCodec() | |
| 25 | { | |
| 26 | } | |
| 27 | ||
| 28 | void wxSoundMulawCodec::Decode() | |
| 29 | { | |
| 30 | int smp; | |
| 31 | wxSoundDataFormat pref_frmt; | |
| 32 | ||
| 33 | pref_frmt = GetPreferredFormat(0); | |
| 34 | if (m_io_format != pref_frmt) | |
| 35 | ChainCodecAfter(pref_frmt); | |
| 36 | ||
| 37 | InitMode(DECODING); | |
| 38 | ||
| 926c550d | 39 | while (!StreamOk()) { |
| 4d6306eb GL |
40 | smp = ulaw2linear(m_in_sound->GetChar()); |
| 41 | #ifdef USE_BE_MACH | |
| 42 | m_out_sound->PutChar((smp & 0xff00) >> 8); | |
| 43 | m_out_sound->PutChar(smp & 0xff); | |
| 44 | #else | |
| 45 | m_out_sound->PutChar(smp & 0xff); | |
| 46 | m_out_sound->PutChar((smp & 0xff00) >> 8); | |
| 47 | #endif | |
| 48 | } | |
| 49 | } | |
| 50 | ||
| 51 | void wxSoundMulawCodec::Encode() | |
| 52 | { | |
| 53 | int smp; | |
| 54 | wxSoundDataFormat pref_frmt; | |
| 55 | ||
| 56 | pref_frmt = GetPreferredFormat(0); | |
| 57 | if (m_io_format != pref_frmt) | |
| 58 | ChainCodecBefore(pref_frmt); | |
| 59 | ||
| 60 | InitMode(ENCODING); | |
| 61 | ||
| 926c550d | 62 | while (!StreamOk()) { |
| 4d6306eb GL |
63 | #ifdef USE_BE_MACH |
| 64 | smp = ((unsigned short)m_in_sound->GetChar()) << 8; | |
| 65 | smp |= m_in_sound->GetChar() & 0xff; | |
| 66 | #else | |
| 67 | smp = m_in_sound->GetChar() & 0xff; | |
| 68 | smp |= ((unsigned short)m_in_sound->GetChar()) << 8; | |
| 69 | #endif | |
| 70 | m_out_sound->PutChar(linear2ulaw(smp)); | |
| 71 | } | |
| 72 | } | |
| 73 | ||
| 74 | size_t wxSoundMulawCodec::GetByteRate() const | |
| 75 | { | |
| 76 | return m_srate; | |
| 77 | } | |
| 78 | ||
| 79 | wxSoundDataFormat wxSoundMulawCodec::GetPreferredFormat(int WXUNUSED(no)) const | |
| 80 | { | |
| 81 | wxSoundDataFormat format; | |
| 82 | ||
| 83 | format.SetCodecNo(WXSOUND_PCM); | |
| 84 | format.SetSampleRate(m_srate); | |
| 85 | format.SetBps(16); | |
| 86 | format.SetChannels(1); | |
| 87 | format.SetSign(wxSND_SAMPLE_SIGNED); | |
| 88 | #ifdef USE_BE_MACH | |
| 89 | format.SetByteOrder(wxSND_SAMPLE_BE); | |
| 90 | #else | |
| 91 | format.SetByteOrder(wxSND_SAMPLE_LE); | |
| 92 | #endif | |
| 93 | return format; | |
| 94 | } |