8a7c9dcc1c
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1722 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
119 lines
2.7 KiB
C++
119 lines
2.7 KiB
C++
#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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// TODO: For the moment, only 1 channel is supported.
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m_codec_state = new g72x_state;
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g72x_init_state(m_codec_state);
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}
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wxSoundAdpcmCodec::~wxSoundAdpcmCodec()
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{
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}
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void wxSoundAdpcmCodec::InitWith(const wxSoundDataFormat& format)
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{
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m_srate = format.GetSampleRate();
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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 (m_bits_waiting == 0)
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m_current_byte = m_in_sound->GetChar();
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mask = (1 << nbits) - 1;
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bits = m_current_byte & mask;
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m_current_byte >>= nbits;
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m_bits_waiting -= 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, bits;
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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, m_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, m_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 wxSoundAdpcmCodec::Encode()
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{
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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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}
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size_t wxSoundAdpcmCodec::GetByteRate() const
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{
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return (m_io_format.GetSampleRate() * m_io_format.GetChannels()) / 2;
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}
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wxSoundDataFormat wxSoundAdpcmCodec::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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