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

// --------------------------------------------------------------------------
// Name: sndulaw.cpp
// Purpose:
// Date: 08/11/1999
// Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999
// CVSID: $Id$
// wxWindows licence
// --------------------------------------------------------------------------

#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 **WXUNUSED(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 *WXUNUSED(buffer), wxUint32 WXUNUSED(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(wxT("Number of ADPCM coefficients must be non null"));
        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: $Id$
58b9c9ba	7	// wxWindows licence
e8482f24	8	// --------------------------------------------------------------------------
e8482f24	9
92a19c2e	10	#include "wx/wxprec.h"
c42b1de6 GL	11
	12	#ifndef WX_PRECOMP
	13	#include "wx/defs.h"
	14	#include "wx/memory.h"
	15	#include "wx/log.h"
	16	#endif
	17
59917a74 JS	18	#include "wx/mmedia/sndbase.h"
	19	#include "wx/mmedia/sndfile.h"
	20	#include "wx/mmedia/sndpcm.h"
	21	#include "wx/mmedia/sndmsad.h"
e8482f24 GL	22
	23	// --------------------------------------------------------------------------
	24	// wxSoundFormatMSAdpcm
	25	// --------------------------------------------------------------------------
	26
	27	wxSoundFormatMSAdpcm::wxSoundFormatMSAdpcm()
	28	: m_srate(22050)
	29	{
c42b1de6 GL	30	m_ncoefs = 0;
	31	m_coefs_len = 0;
	32	m_coefs = NULL;
e8482f24 GL	33	}
	34
	35	wxSoundFormatMSAdpcm::~wxSoundFormatMSAdpcm()
	36	{
c42b1de6 GL	37	if (m_ncoefs) {
	38	wxUint16 i;
	39
	40	for (i=0;i<m_ncoefs;i++)
	41	delete[] m_coefs[i];
	42	delete[] m_coefs;
	43	}
	44
e8482f24 GL	45	}
	46
	47	void wxSoundFormatMSAdpcm::SetSampleRate(wxUint32 srate)
	48	{
	49	m_srate = srate;
	50	}
	51
	52	wxUint32 wxSoundFormatMSAdpcm::GetSampleRate() const
	53	{
	54	return m_srate;
	55	}
	56
c42b1de6 GL	57	void wxSoundFormatMSAdpcm::SetChannels(wxUint16 nchannels)
	58	{
	59	m_nchannels = nchannels;
	60	}
	61
	62	wxUint16 wxSoundFormatMSAdpcm::GetChannels() const
	63	{
	64	return m_nchannels;
	65	}
	66
42c37dec	67	void wxSoundFormatMSAdpcm::SetCoefs(wxInt16 **WXUNUSED(coefs), wxUint16 ncoefs,
c42b1de6 GL	68	wxUint16 coefs_len)
	69	{
	70	wxUint16 i;
	71
	72	if (m_ncoefs) {
	73	for (i=0;i<m_ncoefs;i++)
	74	delete[] (m_coefs[i]);
	75	delete[] m_coefs;
	76	}
	77	// TODO: Add some memory checking here
b97a1a73	78	m_coefs = new wxInt16 *[ncoefs];
c42b1de6 GL	79
	80	for (i=0;i<ncoefs;i++)
	81	m_coefs[i] = new wxInt16[coefs_len];
	82
	83	m_ncoefs = ncoefs;
	84	m_coefs_len = coefs_len;
	85	}
	86
	87	void wxSoundFormatMSAdpcm::GetCoefs(wxInt16 **& coefs, wxUint16& ncoefs,
	88	wxUint16& coefs_len) const
	89	{
	90	coefs = m_coefs;
	91	ncoefs = m_ncoefs;
	92	coefs_len = m_coefs_len;
	93	}
	94
	95	void wxSoundFormatMSAdpcm::SetBlockSize(wxUint16 block_size)
	96	{
	97	m_block_size = block_size;
	98	}
	99
	100	wxUint16 wxSoundFormatMSAdpcm::GetBlockSize() const
	101	{
	102	return m_block_size;
	103	}
	104
e8482f24 GL	105	wxSoundFormatBase *wxSoundFormatMSAdpcm::Clone() const
	106	{
	107	wxSoundFormatMSAdpcm *adpcm = new wxSoundFormatMSAdpcm();
	108
c42b1de6 GL	109	adpcm->m_srate = m_srate;
	110	adpcm->SetCoefs(m_coefs, m_ncoefs, m_coefs_len);
	111	adpcm->m_nchannels = m_nchannels;
	112	adpcm->m_block_size = m_block_size;
e8482f24 GL	113	return adpcm;
	114	}
	115
	116	wxUint32 wxSoundFormatMSAdpcm::GetTimeFromBytes(wxUint32 bytes) const
	117	{
c42b1de6	118	return 2 * bytes / (m_nchannels * m_srate);
e8482f24 GL	119	}
	120
	121	wxUint32 wxSoundFormatMSAdpcm::GetBytesFromTime(wxUint32 time) const
	122	{
c42b1de6	123	return time * m_nchannels * m_srate / 2;
e8482f24 GL	124	}
	125
	126	bool wxSoundFormatMSAdpcm::operator !=(const wxSoundFormatBase& frmt2) const
	127	{
c42b1de6	128	const wxSoundFormatMSAdpcm adpcm = (const wxSoundFormatMSAdpcm )&frmt2;
e8482f24 GL	129
e8482f24 GL	130	if (frmt2.GetType() != wxSOUND_MSADPCM)
dea7e44a	131	return true;
e8482f24	132
c42b1de6	133	return (adpcm->m_srate != m_srate) && (adpcm->m_nchannels != m_nchannels);
e8482f24 GL	134	}
	135
	136	// --------------------------------------------------------------------------
	137	// wxSoundStreamMSAdpcm
	138	// --------------------------------------------------------------------------
	139	wxSoundStreamMSAdpcm::wxSoundStreamMSAdpcm(wxSoundStream& sndio)
	140	: wxSoundStreamCodec(sndio)
	141	{
	142	// PCM converter
	143	m_router = new wxSoundRouterStream(sndio);
dea7e44a WS	144	m_got_header = false;
dea7e44a WS	145	m_stereo = false;
e8482f24 GL	146	}
	147
	148	wxSoundStreamMSAdpcm::~wxSoundStreamMSAdpcm()
	149	{
	150	delete m_router;
	151	}
	152
42c37dec	153	wxSoundStream& wxSoundStreamMSAdpcm::Read(void *WXUNUSED(buffer), wxUint32 WXUNUSED(len))
e8482f24 GL	154	{
	155	m_snderror = wxSOUND_NOCODEC;
	156	m_lastcount = 0;
	157	return *this;
	158	}
	159
	160	static wxInt16 gl_ADPCMcoeff_delta[] = {
c42b1de6 GL	161	230, 230, 230, 230, 307, 409, 512, 614, 768, 614, 512, 409, 307,
c42b1de6 GL	162	230, 230, 230
e8482f24 GL	163	};
e8482f24 GL	164
c42b1de6 GL	165	wxUint32 wxSoundStreamMSAdpcm::DecodeMonoADPCM(const void *in_buffer,
	166	void *out_buffer,
	167	wxUint32 in_len)
e8482f24	168	{
c42b1de6 GL	169	wxUint8 *ADPCMdata;
	170	wxInt16 *PCMdata;
	171	AdpcmState *state;
	172	wxUint32 out_len;
	173
	174	ADPCMdata = (wxUint8 *)in_buffer;
	175	PCMdata = (wxInt16 *)out_buffer;
	176	state = &m_state[0];
	177
	178	#define GET_DATA_16(i) i = ADPCMdata++, i \|= ((wxUint32)(ADPCMdata++) << 8)
	179	#define GET_DATA_8(i) i = (*ADPCMdata++)
	180
	181	out_len = 0;
	182	while (in_len != 0) {
	183	if (m_next_block == 0) {
	184	GET_DATA_8(state->predictor);
	185	GET_DATA_16(state->iDelta);
	186
	187	GET_DATA_16(state->samp1);
	188	GET_DATA_16(state->samp2);
	189
	190	state->coeff[0] = state->coeff[1] = m_coefs[0][ state->predictor ];
	191
	192	*PCMdata++ = state->samp2;
	193	*PCMdata++ = state->samp1;
	194	in_len -= 7;
	195	out_len += 4;
	196	m_next_block = m_block_size;
	197	continue;
	198	}
	199
	200	while (in_len != 0 && m_next_block != 0) {
	201	wxUint8 nib[2];
	202
	203	GET_DATA_8(nib[0]);
	204	nib[1] = (nib[0] >> 4) & 0x0f;
	205	nib[0] &= 0x0f;
	206
	207	Nibble(nib[0], state, &PCMdata);
	208	Nibble(nib[1], state, &PCMdata);
	209
	210	in_len -= 4;
	211	out_len += 4;
	212	m_next_block -= 4;
	213	}
e8482f24	214	}
c42b1de6 GL	215
	216	return out_len;
	217
	218	#undef GET_DATA_16
	219	#undef GET_DATA_8
	220	}
	221
	222	wxUint32 wxSoundStreamMSAdpcm::DecodeStereoADPCM(const void *in_buffer,
	223	void *out_buffer,
	224	wxUint32 in_len)
	225	{
	226	wxUint8 *ADPCMdata;
	227	wxInt16 *PCMdata;
	228	AdpcmState state0, state1;
	229	wxUint32 out_len;
e8482f24	230
c42b1de6 GL	231	ADPCMdata = (wxUint8 *)in_buffer;
	232	PCMdata = (wxInt16 *)out_buffer;
	233
	234	state0 = &m_state[0];
	235	state1 = &m_state[1];
	236
	237	#define GET_DATA_16(i) i = ADPCMdata++, i \|= ((wxUint32)(ADPCMdata++) << 8)
	238	#define GET_DATA_8(i) i = (*ADPCMdata++)
	239
	240	out_len = 0;
	241	while (in_len != 0) {
	242	if (!m_next_block) {
	243	GET_DATA_8(state0->predictor);
	244	GET_DATA_8(state1->predictor);
	245
	246	GET_DATA_16(state0->iDelta);
	247	GET_DATA_16(state1->iDelta);
e8482f24	248
c42b1de6 GL	249	GET_DATA_16(state0->samp1);
	250	GET_DATA_16(state1->samp1);
	251	GET_DATA_16(state0->samp2);
	252	GET_DATA_16(state1->samp2);
e8482f24	253
c42b1de6 GL	254	*PCMdata++ = state0->samp2;
	255	*PCMdata++ = state1->samp2;
	256	*PCMdata++ = state0->samp1;
	257	*PCMdata++ = state1->samp1;
	258
	259	in_len -= 14;
	260	out_len += 8;
	261	m_next_block = m_block_size;
	262	continue;
	263	}
	264
	265	while (in_len != 0 && m_next_block > 0) {
	266	wxUint8 nib[2];
	267
	268	GET_DATA_8(nib[0]);
	269	nib[1] = (nib[0] >> 4) & 0x0f;
	270	nib[0] &= 0x0f;
	271
	272	Nibble(nib[0], state0, &PCMdata);
	273	Nibble(nib[1], state1, &PCMdata);
	274
	275	in_len -= 4;
	276	out_len += 4;
	277	m_next_block -= 4;
	278	}
	279	}
	280
	281	return out_len;
	282
	283	#undef GET_DATA_16
	284	#undef GET_DATA_8
	285	}
	286
	287	void wxSoundStreamMSAdpcm::Nibble(wxInt8 nyb,
	288	AdpcmState *state,
	289	wxInt16 **out_buffer)
	290	{
	291	wxUint32 new_delta;
	292	wxInt32 new_sample;
	293
	294	// First: compute the next delta value
	295	new_delta = (state->iDelta * gl_ADPCMcoeff_delta[nyb]) >> 8;
	296	// If null, minor it by 16
	297	if (!new_delta)
	298	new_delta = 16;
	299
	300	// Barycentre
	301	new_sample = (state->samp1 * state->coeff[0] +
	302	state->samp2 * state->coeff[1]) / 256;
	303
	304	// Regenerate the sign
	305	if (nyb & 0x08)
	306	nyb -= 0x10;
	307
	308	new_sample += state->iDelta * nyb;
	309
	310	// Samples must be in [-32767, 32768]
	311	if (new_sample < -32768)
	312	new_sample = -32768;
	313	else if (new_sample > 32767)
	314	new_sample = 32767;
	315
	316	state->iDelta = new_delta;
	317	state->samp2 = state->samp1;
318	state->samp1 = new_sample;
319
320	(out_buffer)++ = new_sample;
321	}
322
323	wxSoundStream& wxSoundStreamMSAdpcm::Write(const void *buffer, wxUint32 len)
324	{
325	wxUint8 *out_buf;
326	wxUint32 new_len;
327
328	// TODO: prealloc the output buffer
329	out_buf = new wxUint8[len*2];
330
331	if (!m_stereo)
332	new_len = DecodeMonoADPCM(buffer, out_buf, len);
333	else
334	new_len = DecodeStereoADPCM(buffer, out_buf, len);
335
336	m_router->Write(out_buf, new_len);
337
338	m_lastcount = len;
339	m_snderror = wxSOUND_NOERROR;
340
341	delete[] out_buf;
342
e8482f24 GL	343	return *this;
	344	}
	345
	346	wxUint32 wxSoundStreamMSAdpcm::GetBestSize() const
	347	{
	348	return m_sndio->GetBestSize() / 2;
	349	}
	350
	351	bool wxSoundStreamMSAdpcm::SetSoundFormat(const wxSoundFormatBase& format)
	352	{
c42b1de6	353	if (format.GetType() != wxSOUND_MSADPCM) {
e8482f24	354	m_snderror = wxSOUND_INVFRMT;
dea7e44a	355	return false;
e8482f24 GL	356	}
	357
	358	wxSoundFormatPcm pcm;
c42b1de6 GL	359	wxSoundFormatMSAdpcm *adpcm;
c42b1de6 GL	360	wxUint16 ncoefs, coefs_len;
e8482f24 GL	361
	362	wxSoundStreamCodec::SetSoundFormat(format);
	363
c42b1de6 GL	364	adpcm = (wxSoundFormatMSAdpcm *)m_sndformat;
	365
	366	adpcm->GetCoefs(m_coefs, ncoefs, coefs_len);
	367
	368	if (!ncoefs) {
f815011f	369	wxLogError(wxT("Number of ADPCM coefficients must be non null"));
dea7e44a	370	return false;
c42b1de6	371	}
e8482f24 GL	372
	373	pcm.SetSampleRate(adpcm->GetSampleRate());
	374	pcm.SetBPS(16);
	375	pcm.SetChannels(adpcm->GetChannels());
dea7e44a	376	pcm.Signed(true);
e8482f24	377	pcm.SetOrder(wxBYTE_ORDER);
c42b1de6 GL	378
	379	m_stereo = (adpcm->GetChannels() == 2);
	380	m_block_size = adpcm->GetBlockSize();
	381	m_next_block = 0;
e8482f24 GL	382
	383	m_router->SetSoundFormat(pcm);
	384
dea7e44a	385	return true;
e8482f24 GL	386	}
e8482f24 GL	387