[wxWidgets.git] / contrib / src / mmedia / sndmsad.cpp

// --------------------------------------------------------------------------
// Name: sndulaw.cpp
// Purpose:
// Date: 08/11/1999
// Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999
// CVSID: $Id$
// --------------------------------------------------------------------------
#ifdef __GNUG__
#pragma implementation "sndmsad.cpp"
#endif

#include "wx/wxprec.h"

#ifndef WX_PRECOMP
  #include "wx/defs.h"
  #include "wx/memory.h"
  #include "wx/log.h"
#endif

#include "wx/mmedia/sndbase.h"
#include "wx/mmedia/sndfile.h"
#include "wx/mmedia/sndpcm.h"
#include "wx/mmedia/sndmsad.h"

// --------------------------------------------------------------------------
// wxSoundFormatMSAdpcm
// --------------------------------------------------------------------------

wxSoundFormatMSAdpcm::wxSoundFormatMSAdpcm()
        : m_srate(22050)
{
    m_ncoefs    = 0;
    m_coefs_len = 0;
    m_coefs     = NULL;
}

wxSoundFormatMSAdpcm::~wxSoundFormatMSAdpcm()
{
    if (m_ncoefs) {
        wxUint16 i;

        for (i=0;i<m_ncoefs;i++)
            delete[] m_coefs[i];
        delete[] m_coefs;
    }
    
}

void wxSoundFormatMSAdpcm::SetSampleRate(wxUint32 srate)
{
    m_srate = srate;
}

wxUint32 wxSoundFormatMSAdpcm::GetSampleRate() const
{
    return m_srate;
}

void wxSoundFormatMSAdpcm::SetChannels(wxUint16 nchannels)
{
    m_nchannels = nchannels;
}

wxUint16 wxSoundFormatMSAdpcm::GetChannels() const
{
    return m_nchannels; 
}

void wxSoundFormatMSAdpcm::SetCoefs(wxInt16 **coefs, wxUint16 ncoefs,
                                    wxUint16 coefs_len)
{
    wxUint16 i;

    if (m_ncoefs) {
        for (i=0;i<m_ncoefs;i++)
           delete[] (m_coefs[i]);
        delete[] m_coefs;
    }
    // TODO: Add some memory checking here
    m_coefs = new wxInt16 *[ncoefs];

    for (i=0;i<ncoefs;i++)
       m_coefs[i] = new wxInt16[coefs_len];

    m_ncoefs = ncoefs;
    m_coefs_len = coefs_len;
}

void wxSoundFormatMSAdpcm::GetCoefs(wxInt16 **& coefs, wxUint16& ncoefs,
                                    wxUint16& coefs_len) const
{
    coefs     = m_coefs;
    ncoefs    = m_ncoefs;
    coefs_len = m_coefs_len;
}

void wxSoundFormatMSAdpcm::SetBlockSize(wxUint16 block_size)
{
    m_block_size = block_size;
}

wxUint16 wxSoundFormatMSAdpcm::GetBlockSize() const
{
    return m_block_size;
}

wxSoundFormatBase *wxSoundFormatMSAdpcm::Clone() const
{
    wxSoundFormatMSAdpcm *adpcm = new wxSoundFormatMSAdpcm();
    
    adpcm->m_srate       = m_srate;
    adpcm->SetCoefs(m_coefs, m_ncoefs, m_coefs_len);
    adpcm->m_nchannels   = m_nchannels;
    adpcm->m_block_size  = m_block_size;
    return adpcm;
}

wxUint32 wxSoundFormatMSAdpcm::GetTimeFromBytes(wxUint32 bytes) const
{
    return 2 * bytes / (m_nchannels * m_srate);
}

wxUint32 wxSoundFormatMSAdpcm::GetBytesFromTime(wxUint32 time) const
{
    return time * m_nchannels * m_srate / 2;
}

bool wxSoundFormatMSAdpcm::operator !=(const wxSoundFormatBase& frmt2) const
{
    const wxSoundFormatMSAdpcm *adpcm = (const wxSoundFormatMSAdpcm *)&frmt2;
    
    if (frmt2.GetType() != wxSOUND_MSADPCM)
        return TRUE;
    
    return (adpcm->m_srate != m_srate) && (adpcm->m_nchannels != m_nchannels);
}

// --------------------------------------------------------------------------
// wxSoundStreamMSAdpcm
// --------------------------------------------------------------------------
wxSoundStreamMSAdpcm::wxSoundStreamMSAdpcm(wxSoundStream& sndio)
        : wxSoundStreamCodec(sndio)
{
    // PCM converter
    m_router     = new wxSoundRouterStream(sndio);
    m_got_header = FALSE;
    m_stereo = FALSE;
}

wxSoundStreamMSAdpcm::~wxSoundStreamMSAdpcm()
{
    delete m_router;
}

wxSoundStream& wxSoundStreamMSAdpcm::Read(void *buffer, wxUint32 len)
{
    m_snderror = wxSOUND_NOCODEC;
    m_lastcount = 0;
    return *this;
}

static wxInt16 gl_ADPCMcoeff_delta[] = {
    230, 230, 230, 230, 307, 409, 512, 614, 768, 614, 512, 409, 307,
    230, 230, 230
};

wxUint32 wxSoundStreamMSAdpcm::DecodeMonoADPCM(const void *in_buffer,
                                               void *out_buffer,
                                               wxUint32 in_len)
{
    wxUint8  *ADPCMdata;
    wxInt16  *PCMdata;
    AdpcmState *state;
    wxUint32 out_len;
    
    ADPCMdata = (wxUint8 *)in_buffer;
    PCMdata   = (wxInt16 *)out_buffer;
    state     = &m_state[0];
    
#define GET_DATA_16(i) i = *ADPCMdata++, i |= ((wxUint32)(*ADPCMdata++) << 8)
#define GET_DATA_8(i) i = (*ADPCMdata++)

    out_len = 0;
    while (in_len != 0) {
        if (m_next_block == 0) {
            GET_DATA_8(state->predictor);
            GET_DATA_16(state->iDelta);
            
            GET_DATA_16(state->samp1);
            GET_DATA_16(state->samp2);
            
            state->coeff[0] = state->coeff[1] = m_coefs[0][ state->predictor ];
            
            *PCMdata++ = state->samp2;
            *PCMdata++ = state->samp1;
            in_len     -= 7;
            out_len    += 4;
            m_next_block = m_block_size;
            continue;
        }
    
        while (in_len != 0 && m_next_block != 0) {
            wxUint8 nib[2];
            
            GET_DATA_8(nib[0]);
            nib[1] = (nib[0] >> 4) & 0x0f;
            nib[0] &= 0x0f;
        
            Nibble(nib[0], state, &PCMdata);
            Nibble(nib[1], state, &PCMdata);
        
            in_len       -= 4;
            out_len      += 4;
            m_next_block -= 4;
        }
    }

    return out_len;

#undef GET_DATA_16
#undef GET_DATA_8
}

wxUint32 wxSoundStreamMSAdpcm::DecodeStereoADPCM(const void *in_buffer,
                                                 void *out_buffer,
                                                 wxUint32 in_len)
{            
    wxUint8  *ADPCMdata;
    wxInt16  *PCMdata;
    AdpcmState *state0, *state1;
    wxUint32 out_len;
    
    ADPCMdata = (wxUint8 *)in_buffer;
    PCMdata   = (wxInt16 *)out_buffer;
    
    state0 = &m_state[0];
    state1 = &m_state[1];
    
#define GET_DATA_16(i) i = *ADPCMdata++, i |= ((wxUint32)(*ADPCMdata++) << 8)
#define GET_DATA_8(i) i = (*ADPCMdata++)

    out_len = 0;
    while (in_len != 0) {
        if (!m_next_block) {
            GET_DATA_8(state0->predictor);
            GET_DATA_8(state1->predictor);
            
            GET_DATA_16(state0->iDelta);
            GET_DATA_16(state1->iDelta);
        
            GET_DATA_16(state0->samp1);
            GET_DATA_16(state1->samp1);
            GET_DATA_16(state0->samp2);
            GET_DATA_16(state1->samp2);
        
            *PCMdata++ = state0->samp2;
            *PCMdata++ = state1->samp2;
            *PCMdata++ = state0->samp1;
            *PCMdata++ = state1->samp1;

            in_len     -= 14;
            out_len    += 8;
            m_next_block = m_block_size;
            continue;
        }
    
        while (in_len != 0 && m_next_block > 0) {
            wxUint8 nib[2];
            
            GET_DATA_8(nib[0]);
            nib[1] = (nib[0] >> 4) & 0x0f;
            nib[0] &= 0x0f;
            
            Nibble(nib[0], state0, &PCMdata);
            Nibble(nib[1], state1, &PCMdata);
            
            in_len       -= 4;
            out_len      += 4;
            m_next_block -= 4;
        }
    }

    return out_len;

#undef GET_DATA_16
#undef GET_DATA_8
}

void wxSoundStreamMSAdpcm::Nibble(wxInt8 nyb,
                                  AdpcmState *state,
                                  wxInt16 **out_buffer)
{
    wxUint32 new_delta;
    wxInt32  new_sample;

    // First: compute the next delta value
    new_delta  = (state->iDelta * gl_ADPCMcoeff_delta[nyb]) >> 8;
    // If null, minor it by 16
    if (!new_delta)
        new_delta = 16;

    // Barycentre
    new_sample = (state->samp1 * state->coeff[0] +
                  state->samp2 * state->coeff[1]) / 256;

    // Regenerate the sign
    if (nyb & 0x08)
        nyb -= 0x10;
    
    new_sample += state->iDelta * nyb;

    // Samples must be in [-32767, 32768]
    if (new_sample < -32768)
        new_sample = -32768;
    else if (new_sample > 32767)
        new_sample = 32767;
    
    state->iDelta = new_delta;
    state->samp2  = state->samp1;
    state->samp1  = new_sample;

    *(*out_buffer)++ = new_sample;
}

wxSoundStream& wxSoundStreamMSAdpcm::Write(const void *buffer, wxUint32 len)
{
    wxUint8 *out_buf;
    wxUint32 new_len;
    
    // TODO: prealloc the output buffer
    out_buf = new wxUint8[len*2];

    if (!m_stereo)
        new_len = DecodeMonoADPCM(buffer, out_buf, len);
    else
        new_len = DecodeStereoADPCM(buffer, out_buf, len);
    
    m_router->Write(out_buf, new_len);

    m_lastcount = len;
    m_snderror  = wxSOUND_NOERROR;
    
    delete[] out_buf;
    
    return *this;
}

wxUint32 wxSoundStreamMSAdpcm::GetBestSize() const
{
    return m_sndio->GetBestSize() / 2;
}

bool wxSoundStreamMSAdpcm::SetSoundFormat(const wxSoundFormatBase& format)
{
    if (format.GetType() != wxSOUND_MSADPCM) {
        m_snderror = wxSOUND_INVFRMT;
        return FALSE;
    }
    
    wxSoundFormatPcm pcm;
    wxSoundFormatMSAdpcm *adpcm;
    wxUint16 ncoefs, coefs_len;
    
    wxSoundStreamCodec::SetSoundFormat(format);
    
    adpcm = (wxSoundFormatMSAdpcm *)m_sndformat;

    adpcm->GetCoefs(m_coefs, ncoefs, coefs_len);

    if (!ncoefs) {
        wxLogError(__FILE__ ":%d: Number of ADPCM coefficients"
                   " must be non null", __LINE__);
        return FALSE;
    }
    
    pcm.SetSampleRate(adpcm->GetSampleRate());
    pcm.SetBPS(16);
    pcm.SetChannels(adpcm->GetChannels());
    pcm.Signed(TRUE);
    pcm.SetOrder(wxBYTE_ORDER);

    m_stereo = (adpcm->GetChannels() == 2);
    m_block_size = adpcm->GetBlockSize();
    m_next_block = 0;
    
    m_router->SetSoundFormat(pcm);
    
    return TRUE;
}
Commit	Line	Data
e8482f24 GL	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__
c42b1de6	9	#pragma implementation "sndmsad.cpp"
e8482f24 GL	10	#endif
e8482f24 GL	11
92a19c2e	12	#include "wx/wxprec.h"
c42b1de6 GL	13
	14	#ifndef WX_PRECOMP
	15	#include "wx/defs.h"
	16	#include "wx/memory.h"
	17	#include "wx/log.h"
	18	#endif
	19
59917a74 JS	20	#include "wx/mmedia/sndbase.h"
	21	#include "wx/mmedia/sndfile.h"
	22	#include "wx/mmedia/sndpcm.h"
	23	#include "wx/mmedia/sndmsad.h"
e8482f24 GL	24
	25	// --------------------------------------------------------------------------
	26	// wxSoundFormatMSAdpcm
	27	// --------------------------------------------------------------------------
	28
	29	wxSoundFormatMSAdpcm::wxSoundFormatMSAdpcm()
	30	: m_srate(22050)
	31	{
c42b1de6 GL	32	m_ncoefs = 0;
	33	m_coefs_len = 0;
	34	m_coefs = NULL;
e8482f24 GL	35	}
	36
	37	wxSoundFormatMSAdpcm::~wxSoundFormatMSAdpcm()
	38	{
c42b1de6 GL	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
e8482f24 GL	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
c42b1de6 GL	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 **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
b97a1a73	80	m_coefs = new wxInt16 *[ncoefs];
c42b1de6 GL	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
e8482f24 GL	107	wxSoundFormatBase *wxSoundFormatMSAdpcm::Clone() const
	108	{
	109	wxSoundFormatMSAdpcm *adpcm = new wxSoundFormatMSAdpcm();
	110
c42b1de6 GL	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;
e8482f24 GL	115	return adpcm;
	116	}
	117
	118	wxUint32 wxSoundFormatMSAdpcm::GetTimeFromBytes(wxUint32 bytes) const
	119	{
c42b1de6	120	return 2 * bytes / (m_nchannels * m_srate);
e8482f24 GL	121	}
	122
	123	wxUint32 wxSoundFormatMSAdpcm::GetBytesFromTime(wxUint32 time) const
	124	{
c42b1de6	125	return time * m_nchannels * m_srate / 2;
e8482f24 GL	126	}
	127
	128	bool wxSoundFormatMSAdpcm::operator !=(const wxSoundFormatBase& frmt2) const
	129	{
c42b1de6	130	const wxSoundFormatMSAdpcm adpcm = (const wxSoundFormatMSAdpcm )&frmt2;
e8482f24 GL	131
	132	if (frmt2.GetType() != wxSOUND_MSADPCM)
	133	return TRUE;
	134
c42b1de6	135	return (adpcm->m_srate != m_srate) && (adpcm->m_nchannels != m_nchannels);
e8482f24 GL	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;
c42b1de6	147	m_stereo = FALSE;
e8482f24 GL	148	}
	149
	150	wxSoundStreamMSAdpcm::~wxSoundStreamMSAdpcm()
	151	{
	152	delete m_router;
	153	}
	154
	155	wxSoundStream& wxSoundStreamMSAdpcm::Read(void *buffer, wxUint32 len)
	156	{
	157	m_snderror = wxSOUND_NOCODEC;
	158	m_lastcount = 0;
	159	return *this;
	160	}
	161
	162	static wxInt16 gl_ADPCMcoeff_delta[] = {
c42b1de6 GL	163	230, 230, 230, 230, 307, 409, 512, 614, 768, 614, 512, 409, 307,
c42b1de6 GL	164	230, 230, 230
e8482f24 GL	165	};
e8482f24 GL	166
c42b1de6 GL	167	wxUint32 wxSoundStreamMSAdpcm::DecodeMonoADPCM(const void *in_buffer,
	168	void *out_buffer,
	169	wxUint32 in_len)
e8482f24	170	{
c42b1de6 GL	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	}
e8482f24	216	}
c42b1de6 GL	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;
e8482f24	232
c42b1de6 GL	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);
e8482f24	250
c42b1de6 GL	251	GET_DATA_16(state0->samp1);
	252	GET_DATA_16(state1->samp1);
	253	GET_DATA_16(state0->samp2);
	254	GET_DATA_16(state1->samp2);
e8482f24	255
c42b1de6 GL	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
e8482f24 GL	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	{
c42b1de6	355	if (format.GetType() != wxSOUND_MSADPCM) {
e8482f24 GL	356	m_snderror = wxSOUND_INVFRMT;
	357	return FALSE;
	358	}
	359
	360	wxSoundFormatPcm pcm;
c42b1de6 GL	361	wxSoundFormatMSAdpcm *adpcm;
c42b1de6 GL	362	wxUint16 ncoefs, coefs_len;
e8482f24 GL	363
	364	wxSoundStreamCodec::SetSoundFormat(format);
	365
c42b1de6 GL	366	adpcm = (wxSoundFormatMSAdpcm *)m_sndformat;
	367
	368	adpcm->GetCoefs(m_coefs, ncoefs, coefs_len);
	369
	370	if (!ncoefs) {
	371	wxLogError(__FILE__ ":%d: Number of ADPCM coefficients"
	372	" must be non null", __LINE__);
	373	return FALSE;
	374	}
e8482f24 GL	375
	376	pcm.SetSampleRate(adpcm->GetSampleRate());
	377	pcm.SetBPS(16);
	378	pcm.SetChannels(adpcm->GetChannels());
	379	pcm.Signed(TRUE);
	380	pcm.SetOrder(wxBYTE_ORDER);
c42b1de6 GL	381
	382	m_stereo = (adpcm->GetChannels() == 2);
	383	m_block_size = adpcm->GetBlockSize();
	384	m_next_block = 0;
e8482f24 GL	385
	386	m_router->SetSoundFormat(pcm);
	387
	388	return TRUE;
	389	}
	390