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Commit	Line	Data
	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	////////////////////////////////////////////////////////////////////////////////
	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
	39	while (!StreamOk()) {
	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
	62	while (!StreamOk()) {
	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	}