87 lines
1.7 KiB
C++
87 lines
1.7 KiB
C++
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#ifdef __GNUG__
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#pragma implementation "sndmulaw.h"
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#endif
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#include "sndsnd.h"
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#include "sndfrmt.h"
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#include "sndadpcm.h"
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#include "adpcm/g72x.h"
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wxSoundAdpcmCodec::wxSoundAdpcmCodec()
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: wxSoundCodec()
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{
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g72x_init_state(codec_state);
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}
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wxSoundAdpcmCodec::~wxSoundAdpcmCodec()
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{
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}
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int wxSoundAdpcmCodec::GetBits(int nbits)
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{
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unsigned int mask;
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int bits;
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if (bits_waiting == 0)
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current_byte = m_in_sound->GetChar();
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mask = (1 << nbits) - 1;
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bits = current_byte & mask;
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current_byte >>= nbits;
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return bits;
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}
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void wxSoundAdpcmCodec::Decode()
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{
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int smp;
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wxSoundDataFormat pref_frmt;
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pref_frmt = GetPreferredFormat(0);
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if (!(m_io_format == pref_frmt))
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ChainCodecAfter(pref_frmt);
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bits = GetBits(4);
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if (m_io_format.GetByteOrder() == wxSND_SAMPLE_LE) {
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while (!StreamOk()) {
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smp = g721_decoder(bits, AUDIO_ENCODING_LINEAR, codec_state);
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m_out_sound->PutChar(smp & 0x00ff);
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m_out_sound->PutChar((smp & 0xff00) >> 8);
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bits = GetBits(4);
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}
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} else {
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while (!StreamOk()) {
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smp = g721_decoder(bits, AUDIO_ENCODING_LINEAR, codec_state);
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m_out_sound->PutChar((smp & 0xff00) >> 8);
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m_out_sound->PutChar(smp & 0x00ff);
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bits = GetBits(4);
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}
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}
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}
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void wxSoundMulawCodec::Encode()
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{
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}
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size_t wxSoundMulawCodec::GetByteRate() const
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{
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return m_srate;
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}
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wxSoundDataFormat wxSoundMulawCodec::GetPreferredFormat(int WXUNUSED(no)) const
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{
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wxSoundDataFormat format;
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format.SetCodecNo(WXSOUND_PCM);
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format.SetSampleRate(m_srate);
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format.SetBps(16);
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format.SetChannels(1);
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format.SetSign(wxSND_SAMPLE_SIGNED);
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#ifdef USE_BE_MACH
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format.SetByteOrder(wxSND_SAMPLE_BE);
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#else
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format.SetByteOrder(wxSND_SAMPLE_LE);
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#endif
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return format;
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}
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