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

// --------------------------------------------------------------------------
// Name: sndcpcm.cpp
// Purpose:
// Date: 08/11/1999
// Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999, 2000
// CVSID: $Id$
// wxWindows licence
// --------------------------------------------------------------------------

#include "wx/wxprec.h"

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

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#include "wx/mmedia/sndbase.h"
#include "wx/mmedia/sndpcm.h"
#include "wx/mmedia/sndcpcm.h"

wxSoundStreamPcm::wxSoundStreamPcm(wxSoundStream& sndio)
        : wxSoundStreamCodec(sndio)
{
    m_function_in = NULL;
    m_function_out = NULL;
    m_prebuffer = NULL;
    m_prebuffer_size = 0;
    m_best_size = 0;
}

wxSoundStreamPcm::~wxSoundStreamPcm()
{
    if (m_prebuffer)
        delete[] m_prebuffer;
}

wxUint32 wxSoundStreamPcm::GetBestSize() const
{
    return m_best_size;
}

// -----------------------------------------------------------------------
// "Converters" definitions/implementations
// -----------------------------------------------------------------------

#define DEFINE_CONV(name, input_type, output_type, convert) \
static void Convert_##name(const void *buf_in, void *buf_out, wxUint32 len) \
{\
  register input_type src; \
  register const input_type *t_buf_in = (input_type *)buf_in; \
  register output_type *t_buf_out = (output_type *)buf_out; \
\
  while (len > 0) { \
    src = *t_buf_in++; \
    *t_buf_out++ = convert; \
    len -= sizeof(input_type); \
  } \
}

// TODO: define converters for all other formats (32, 24)

DEFINE_CONV(8_8_sign, wxUint8, wxUint8, (src ^ 0x80))

DEFINE_CONV(8_16, wxUint8, wxUint16, (((wxUint16)src) << 8))
DEFINE_CONV(8_16_swap, wxUint8, wxUint16, (src))
DEFINE_CONV(8_16_sign, wxUint8, wxUint16, (((wxUint16)(src ^ 0x80)) << 8))
DEFINE_CONV(8_16_sign_swap, wxUint8, wxUint16, (src ^ 0x80))

DEFINE_CONV(16_8, wxUint16, wxUint8, (wxUint8)(src >> 8))
DEFINE_CONV(16_8_sign, wxUint16, wxUint8, (wxUint8)((src >> 8) ^ 0x80))
DEFINE_CONV(16_swap_8, wxUint16, wxUint8, (wxUint8)(src & 0xff))
DEFINE_CONV(16_swap_8_sign, wxUint16, wxUint8, (wxUint8)((src & 0xff) ^ 0x80))

//DEFINE_CONV(24_8, wxUint32, wxUint8, (wxUint8)(src >> 16))
//DEFINE_CONV(24_8_sig, wxUint32, wxUint8, (wxUint8)((src >> 16) ^ 0x80))

//DEFINE_CONV(32_8, wxUint32, wxUint8, (wxUint8)(src >> 24))

DEFINE_CONV(16_sign, wxUint16, wxUint16, (src ^ 0x8000))
DEFINE_CONV(16_swap, wxUint16, wxUint16, (((src & 0xff) << 8) | ((src >> 8) & 0xff)))
// Problem.
DEFINE_CONV(16_swap_16_sign, wxUint16, wxUint16, ((((src & 0xff) << 8) | ((src >> 8) & 0xff)) ^ 0x80))
// DEFINE_CONV(16_sign_16_swap, wxUint16, wxUint16, ((((src & 0xff) << 8) | ((src >> 8) & 0xff)) ^ 0x8000))
DEFINE_CONV(16_swap_16_sign_swap, wxUint16, wxUint16, (src ^ 0x80))

// -----------------------------------------------------------------------
// Main PCM stream converter table
// -----------------------------------------------------------------------
// Definition
//   XX -> YY
//   XX -> YY sign
//
//   XX swapped -> YY
//   XX swapped -> YY sign
//
//   XX swapped -> YY swapped
//   XX swapped -> YY swapped sign
//
//   XX stereo -> YY mono
//   XX stereo -> YY mono sign
//
//   XX swapped stereo -> YY swapped mono
//   XX swapped stereo -> YY swapped mono sign
//
//   XX swapped stereo -> YY swapped mono
//   XX swapped stereo -> YY swapped mono sign

static wxSoundStreamPcm::ConverterType s_converters[4][3][2] = { 
    {
        {
            NULL,
            Convert_8_8_sign                    /* 8 -> 8 sign */
        },
        {
            NULL,
            NULL
        },
        {
            NULL,
            NULL
        }
    },
    {
        {
            Convert_8_16,                       /* 8 -> 16 */
            Convert_8_16_sign                   /* 8 -> 16 sign */
        },
        {
            Convert_8_16_swap,                  /* 8 -> 16 swapped */
            Convert_8_16_sign_swap              /* 8 -> 16 sign swapped */
        },
        {
            NULL,
            NULL
        }
    },
    {
        {
            Convert_16_8,                       /* 16 -> 8 */
            Convert_16_8_sign                   /* 16 -> 8 sign */
        },
        {
            Convert_16_swap_8,                  /* 16 swapped -> 8 */
            Convert_16_swap_8_sign              /* 16 swapped -> 8 sign */
        },
        {
            NULL,
            NULL 
        },
    },
    
    {
        {
            NULL,                               /* 16 -> 16 */
            Convert_16_sign                     /* 16 -> 16 sign */
        },
        {
            Convert_16_swap,                    /* 16 swapped -> 16 */
            Convert_16_swap_16_sign             /* 16 swapped -> 16 sign */
        },
        {
            NULL,
            Convert_16_swap_16_sign_swap        /* 16 swapped -> 16 sign swapped */
        }
    }
};

// This is the buffer size multiplier. It gives the needed size of the output size.
static float s_converters_multip[] = {1, 2, 0.5, 1};

//
// TODO: Read() and Write() aren't really safe. If you give it a buffer which
// is not aligned on 2, you may crash (See converter.def).
//

wxSoundStream& wxSoundStreamPcm::Read(void *buffer, wxUint32 len)
{
    wxUint32 in_bufsize;

    // We must have a multiple of 2
    len &= 0x01;
    
    if (!m_function_in) {
        m_sndio->Read(buffer, len);
        m_lastcount = m_sndio->GetLastAccess();
        m_snderror = m_sndio->GetError();
        return *this;
    }

    in_bufsize = GetReadSize(len);
    
    if (len <= m_best_size) {
        m_sndio->Read(m_prebuffer, in_bufsize);
        m_snderror  = m_sndio->GetError();
        if (m_snderror != wxSOUND_NOERROR) {
            m_lastcount = 0;
            return *this;
        }
        
        m_function_in(m_prebuffer, buffer, m_sndio->GetLastAccess());
    } else {
        char *temp_buffer;
        
        temp_buffer = new char[in_bufsize];
        m_sndio->Read(temp_buffer, in_bufsize);

        m_snderror =  m_sndio->GetError();
        if (m_snderror != wxSOUND_NOERROR) {
            m_lastcount = 0;
            return *this;
        }
        
        m_function_in(temp_buffer, buffer, m_sndio->GetLastAccess());
        
        delete[] temp_buffer;
    }
    
    m_lastcount = (wxUint32)(m_sndio->GetLastAccess() * m_multiplier_in);
    
    return *this;
}

wxSoundStream& wxSoundStreamPcm::Write(const void *buffer, wxUint32 len)
{
    wxUint32 out_bufsize;
    
    if (!m_function_out) {
        m_sndio->Write(buffer, len);
        m_lastcount = m_sndio->GetLastAccess();
        m_snderror  = m_sndio->GetError();
        return *this;
    }

    out_bufsize = GetWriteSize(len);

    if (len <= m_best_size) {
        out_bufsize = GetWriteSize(len);

        m_function_out(buffer, m_prebuffer, len);
        m_sndio->Write(m_prebuffer, out_bufsize);
        m_snderror  = m_sndio->GetError();
        if (m_snderror != wxSOUND_NOERROR) {
            m_lastcount = 0;
            return *this;
        }
    } else {
        char *temp_buffer;
        
        temp_buffer = new char[out_bufsize];
        m_function_out(buffer, temp_buffer, len);
        
        m_sndio->Write(temp_buffer, out_bufsize);
        m_snderror =  m_sndio->GetError();
        if (m_snderror != wxSOUND_NOERROR) {
            m_lastcount = 0;
            return *this;
        }
        
        delete[] temp_buffer;
    }

    m_lastcount = (wxUint32)(m_sndio->GetLastAccess() / m_multiplier_out);

    return *this;
}

bool wxSoundStreamPcm::SetSoundFormat(const wxSoundFormatBase& format)
{
    wxSoundFormatBase *new_format;
    wxSoundFormatPcm *pcm_format, *pcm_format2;
    
    if (m_sndio->SetSoundFormat(format)) {
        m_function_out = NULL;
        m_function_in = NULL;
        return true;
    }
    if (format.GetType() != wxSOUND_PCM) {
        m_snderror = wxSOUND_INVFRMT;
        return false;
    }
    if (m_sndformat)
        delete m_sndformat;
    
    new_format = m_sndio->GetSoundFormat().Clone();
    pcm_format = (wxSoundFormatPcm *)&format;
    pcm_format2 = (wxSoundFormatPcm *)new_format;

#if 0
    // ----------------------------------------------------
    // Test whether we need to resample
    if (pcm_format->GetSampleRate() != pcm_format2->GetSampleRate()) {
        wxUint32 src_rate, dst_rate;

        src_rate = pcm_format->GetSampleRate();
        dst_rate = pcm_format2->GetSampleRate();
        m_needResampling = true;
        if (src_rate < dst_rate)
            m_expandSamples = true;
        else
            m_expandSamples = false;
        m_pitch = (src_rate << FLOATBITS) / dst_rate;
    }
#endif
    // ----------------------------------------------------
    // Select table to use:
    //     * 8 bits -> 8 bits
    //     * 16 bits -> 8 bits
    //     * 8 bits -> 16 bits
    //     * 16 bits -> 16 bits

    int table_no, table_no2;
    int i_sign, i_swap;
    
    switch (pcm_format->GetBPS()) {
        case 8:
            table_no = 0;
            break;
        case 16:
            table_no = 1;
            break;
        default:
            // TODO: Add something here: error, log, ...
            return false;
    }
    switch (pcm_format2->GetBPS()) {
        case 8:
            table_no2 = 0;
            break;
        case 16:
            table_no2 = 1;
            break;
        default:
            // TODO: Add something here: error, log, ...
            return false;
    }
    
    if (pcm_format2->Signed() != pcm_format->Signed())
        i_sign = 1;
    else
        i_sign = 0;

#define MY_ORDER wxBYTE_ORDER
#if wxBYTE_ORDER == wxLITTLE_ENDIAN
#define OTHER_ORDER wxBIG_ENDIAN
#else
#define OTHER_ORDER wxLITTLE_ENDIAN
#endif

    // --------------------------------------------------------
    // Find the good converter !

    if (pcm_format->GetOrder() == OTHER_ORDER) {
        if (pcm_format->GetOrder() == pcm_format2->GetOrder())
            i_swap = 2;
        else
            i_swap = 1;
    } else {
        if (pcm_format->GetOrder() == pcm_format2->GetOrder())
            i_swap = 0;
        else
            i_swap = 1;
    }

    m_function_out = s_converters[table_no*2+table_no2][i_swap][i_sign];
    m_function_in  = s_converters[table_no2*2+table_no][i_swap][i_sign];
    m_multiplier_out = s_converters_multip[table_no*2+table_no2];
    m_multiplier_in  = s_converters_multip[table_no2*2+table_no2];

    if (m_prebuffer)
        delete[] m_prebuffer;

    // We try to minimize the need for dynamic memory allocation by preallocating a buffer. But
    // to be sure it will be efficient we minimize the best size.
    if (m_multiplier_in < m_multiplier_out) {
        m_prebuffer_size = (wxUint32)(m_sndio->GetBestSize() *
                                      m_multiplier_out);
        m_best_size = (wxUint32)(m_sndio->GetBestSize() *
                                 m_multiplier_in);
    } else {
        m_prebuffer_size = (wxUint32)(m_sndio->GetBestSize() *
                                      m_multiplier_in);
        m_best_size = (wxUint32)(m_sndio->GetBestSize() *
                                 m_multiplier_out);
    }
    
    m_prebuffer = new char[m_prebuffer_size];
    
    bool SetSoundFormatReturn;

    SetSoundFormatReturn = m_sndio->SetSoundFormat(*new_format);
    wxASSERT( SetSoundFormatReturn );
    wxUnusedVar( SetSoundFormatReturn );
    
    m_sndformat = new_format;
    return true;
}

wxUint32 wxSoundStreamPcm::GetWriteSize(wxUint32 len) const
{
    // For the moment, it is simple but next time it will become more complicated
    // (Resampling)
    return (wxUint32)(len * m_multiplier_out);
}

wxUint32 wxSoundStreamPcm::GetReadSize(wxUint32 len) const
{
    return (wxUint32)(len / m_multiplier_in);
}

// Resampling engine. NOT FINISHED and NOT INCLUDED but this is a first DRAFT.

#if 0

#define FLOATBITS 16
#define INTBITS 16
#define FLOATMASK 0xffff
#define INTMASK 0xffff0000

void ResamplingShrink_##DEPTH##(const void *source, void *destination, wxUint32 len)
{
    wxUint##DEPTH## *source_data, *dest_data;
    wxUint32 pos;

    source_data = (wxUint##DEPTH## *)source;
    dest_data   = (wxUint##DEPTH## *)destination;
    
    pos = m_saved_pos;
    while (len > 0) {
        // Increment the position in the input buffer
        pos += m_pitch;
        if (pos & INTMASK) {
            pos &= FLOATMASK;
            
            *dest_data ++ = *source_data;
        }
        len--;
        source_data++;
    }
    m_saved_pos = pos;
}
#endif
Commit	Line	Data
e8482f24 GL	1	// --------------------------------------------------------------------------
	2	// Name: sndcpcm.cpp
	3	// Purpose:
	4	// Date: 08/11/1999
	5	// Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999, 2000
	6	// CVSID: $Id$
58b9c9ba	7	// wxWindows licence
e8482f24	8	// --------------------------------------------------------------------------
e8482f24 GL	9
	10	#include "wx/wxprec.h"
	11
	12	#ifndef WX_PRECOMP
	13	#include "wx/defs.h"
	14	#include "wx/debug.h"
	15	#include "wx/log.h"
	16	#endif
	17
	18	#ifdef __BORLANDC__
	19	#pragma hdrstop
	20	#endif
	21
	22	#include "wx/mmedia/sndbase.h"
	23	#include "wx/mmedia/sndpcm.h"
	24	#include "wx/mmedia/sndcpcm.h"
	25
	26	wxSoundStreamPcm::wxSoundStreamPcm(wxSoundStream& sndio)
	27	: wxSoundStreamCodec(sndio)
	28	{
	29	m_function_in = NULL;
	30	m_function_out = NULL;
	31	m_prebuffer = NULL;
	32	m_prebuffer_size = 0;
	33	m_best_size = 0;
	34	}
	35
	36	wxSoundStreamPcm::~wxSoundStreamPcm()
	37	{
	38	if (m_prebuffer)
	39	delete[] m_prebuffer;
	40	}
	41
	42	wxUint32 wxSoundStreamPcm::GetBestSize() const
	43	{
	44	return m_best_size;
	45	}
	46
	47	// -----------------------------------------------------------------------
	48	// "Converters" definitions/implementations
	49	// -----------------------------------------------------------------------
	50
	51	#define DEFINE_CONV(name, input_type, output_type, convert) \
15e8daec	52	static void Convert_##name(const void buf_in, void buf_out, wxUint32 len) \
e8482f24 GL	53	{\
	54	register input_type src; \
	55	register const input_type t_buf_in = (input_type )buf_in; \
	56	register output_type t_buf_out = (output_type )buf_out; \
	57	\
	58	while (len > 0) { \
	59	src = *t_buf_in++; \
	60	*t_buf_out++ = convert; \
	61	len -= sizeof(input_type); \
	62	} \
	63	}
	64
	65	// TODO: define converters for all other formats (32, 24)
	66
	67	DEFINE_CONV(8_8_sign, wxUint8, wxUint8, (src ^ 0x80))
	68
	69	DEFINE_CONV(8_16, wxUint8, wxUint16, (((wxUint16)src) << 8))
	70	DEFINE_CONV(8_16_swap, wxUint8, wxUint16, (src))
	71	DEFINE_CONV(8_16_sign, wxUint8, wxUint16, (((wxUint16)(src ^ 0x80)) << 8))
	72	DEFINE_CONV(8_16_sign_swap, wxUint8, wxUint16, (src ^ 0x80))
	73
	74	DEFINE_CONV(16_8, wxUint16, wxUint8, (wxUint8)(src >> 8))
	75	DEFINE_CONV(16_8_sign, wxUint16, wxUint8, (wxUint8)((src >> 8) ^ 0x80))
	76	DEFINE_CONV(16_swap_8, wxUint16, wxUint8, (wxUint8)(src & 0xff))
	77	DEFINE_CONV(16_swap_8_sign, wxUint16, wxUint8, (wxUint8)((src & 0xff) ^ 0x80))
	78
	79	//DEFINE_CONV(24_8, wxUint32, wxUint8, (wxUint8)(src >> 16))
	80	//DEFINE_CONV(24_8_sig, wxUint32, wxUint8, (wxUint8)((src >> 16) ^ 0x80))
	81
	82	//DEFINE_CONV(32_8, wxUint32, wxUint8, (wxUint8)(src >> 24))
	83
	84	DEFINE_CONV(16_sign, wxUint16, wxUint16, (src ^ 0x8000))
	85	DEFINE_CONV(16_swap, wxUint16, wxUint16, (((src & 0xff) << 8) \| ((src >> 8) & 0xff)))
	86	// Problem.
	87	DEFINE_CONV(16_swap_16_sign, wxUint16, wxUint16, ((((src & 0xff) << 8) \| ((src >> 8) & 0xff)) ^ 0x80))
	88	// DEFINE_CONV(16_sign_16_swap, wxUint16, wxUint16, ((((src & 0xff) << 8) \| ((src >> 8) & 0xff)) ^ 0x8000))
	89	DEFINE_CONV(16_swap_16_sign_swap, wxUint16, wxUint16, (src ^ 0x80))
	90
	91	// -----------------------------------------------------------------------
	92	// Main PCM stream converter table
	93	// -----------------------------------------------------------------------
	94	// Definition
	95	// XX -> YY
	96	// XX -> YY sign
	97	//
	98	// XX swapped -> YY
	99	// XX swapped -> YY sign
	100	//
	101	// XX swapped -> YY swapped
	102	// XX swapped -> YY swapped sign
	103	//
	104	// XX stereo -> YY mono
	105	// XX stereo -> YY mono sign
	106	//
	107	// XX swapped stereo -> YY swapped mono
	108	// XX swapped stereo -> YY swapped mono sign
	109	//
	110	// XX swapped stereo -> YY swapped mono
	111	// XX swapped stereo -> YY swapped mono sign
	112
	113	static wxSoundStreamPcm::ConverterType s_converters[4][3][2] = {
	114	{
	115	{
	116	NULL,
117	Convert_8_8_sign /* 8 -> 8 sign */
118	},
119	{
120	NULL,
121	NULL
122	},
123	{
124	NULL,
125	NULL
126	}
127	},
128	{
129	{
130	Convert_8_16, /* 8 -> 16 */
131	Convert_8_16_sign /* 8 -> 16 sign */
132	},
133	{
134	Convert_8_16_swap, /* 8 -> 16 swapped */
135	Convert_8_16_sign_swap /* 8 -> 16 sign swapped */
136	},
137	{
138	NULL,
139	NULL
140	}
141	},
142	{
143	{
144	Convert_16_8, /* 16 -> 8 */
145	Convert_16_8_sign /* 16 -> 8 sign */
146	},
147	{
148	Convert_16_swap_8, /* 16 swapped -> 8 */
149	Convert_16_swap_8_sign /* 16 swapped -> 8 sign */
150	},
151	{
152	NULL,
153	NULL
154	},
155	},
156
157	{
158	{
159	NULL, /* 16 -> 16 */
160	Convert_16_sign /* 16 -> 16 sign */
161	},
162	{
163	Convert_16_swap, /* 16 swapped -> 16 */
164	Convert_16_swap_16_sign /* 16 swapped -> 16 sign */
165	},
166	{
167	NULL,
168	Convert_16_swap_16_sign_swap /* 16 swapped -> 16 sign swapped */
169	}
170	}
171	};
172
173	// This is the buffer size multiplier. It gives the needed size of the output size.
174	static float s_converters_multip[] = {1, 2, 0.5, 1};
175
176	//
177	// TODO: Read() and Write() aren't really safe. If you give it a buffer which
178	// is not aligned on 2, you may crash (See converter.def).
179	//
180
181	wxSoundStream& wxSoundStreamPcm::Read(void *buffer, wxUint32 len)
182	{
183	wxUint32 in_bufsize;
184
185	// We must have a multiple of 2
186	len &= 0x01;
187
188	if (!m_function_in) {
189	m_sndio->Read(buffer, len);
190	m_lastcount = m_sndio->GetLastAccess();
191	m_snderror = m_sndio->GetError();
192	return *this;
193	}
194
195	in_bufsize = GetReadSize(len);
196
197	if (len <= m_best_size) {
198	m_sndio->Read(m_prebuffer, in_bufsize);
199	m_snderror = m_sndio->GetError();
200	if (m_snderror != wxSOUND_NOERROR) {
201	m_lastcount = 0;
202	return *this;
203	}
204
205	m_function_in(m_prebuffer, buffer, m_sndio->GetLastAccess());
206	} else {
207	char *temp_buffer;
208
209	temp_buffer = new char[in_bufsize];
210	m_sndio->Read(temp_buffer, in_bufsize);
211
212	m_snderror = m_sndio->GetError();
213	if (m_snderror != wxSOUND_NOERROR) {
214	m_lastcount = 0;
215	return *this;
216	}
217
218	m_function_in(temp_buffer, buffer, m_sndio->GetLastAccess());
219
220	delete[] temp_buffer;
221	}
222
223	m_lastcount = (wxUint32)(m_sndio->GetLastAccess() * m_multiplier_in);
224
225	return *this;
226	}
227
228	wxSoundStream& wxSoundStreamPcm::Write(const void *buffer, wxUint32 len)
229	{
230	wxUint32 out_bufsize;
231
232	if (!m_function_out) {
233	m_sndio->Write(buffer, len);
234	m_lastcount = m_sndio->GetLastAccess();
235	m_snderror = m_sndio->GetError();
236	return *this;
237	}
238
239	out_bufsize = GetWriteSize(len);
240
241	if (len <= m_best_size) {
242	out_bufsize = GetWriteSize(len);
243
244	m_function_out(buffer, m_prebuffer, len);
245	m_sndio->Write(m_prebuffer, out_bufsize);
246	m_snderror = m_sndio->GetError();
247	if (m_snderror != wxSOUND_NOERROR) {
248	m_lastcount = 0;
249	return *this;
250	}
251	} else {
252	char *temp_buffer;
253
254	temp_buffer = new char[out_bufsize];
255	m_function_out(buffer, temp_buffer, len);
256
257	m_sndio->Write(temp_buffer, out_bufsize);
258	m_snderror = m_sndio->GetError();
259	if (m_snderror != wxSOUND_NOERROR) {
260	m_lastcount = 0;
261	return *this;
262	}
263
264	delete[] temp_buffer;
265	}
266
267	m_lastcount = (wxUint32)(m_sndio->GetLastAccess() / m_multiplier_out);
268
269	return *this;
270	}
271
272	bool wxSoundStreamPcm::SetSoundFormat(const wxSoundFormatBase& format)
273	{
274	wxSoundFormatBase *new_format;
275	wxSoundFormatPcm pcm_format, pcm_format2;
276
277	if (m_sndio->SetSoundFormat(format)) {
278	m_function_out = NULL;
279	m_function_in = NULL;
dea7e44a	280	return true;
e8482f24 GL	281	}
	282	if (format.GetType() != wxSOUND_PCM) {
	283	m_snderror = wxSOUND_INVFRMT;
dea7e44a	284	return false;
e8482f24 GL	285	}
	286	if (m_sndformat)
	287	delete m_sndformat;
	288
	289	new_format = m_sndio->GetSoundFormat().Clone();
	290	pcm_format = (wxSoundFormatPcm *)&format;
	291	pcm_format2 = (wxSoundFormatPcm *)new_format;
	292
	293	#if 0
	294	// ----------------------------------------------------
	295	// Test whether we need to resample
	296	if (pcm_format->GetSampleRate() != pcm_format2->GetSampleRate()) {
	297	wxUint32 src_rate, dst_rate;
	298
	299	src_rate = pcm_format->GetSampleRate();
	300	dst_rate = pcm_format2->GetSampleRate();
dea7e44a	301	m_needResampling = true;
e8482f24	302	if (src_rate < dst_rate)
dea7e44a	303	m_expandSamples = true;
e8482f24	304	else
dea7e44a	305	m_expandSamples = false;
e8482f24 GL	306	m_pitch = (src_rate << FLOATBITS) / dst_rate;
	307	}
	308	#endif
	309	// ----------------------------------------------------
	310	// Select table to use:
	311	// * 8 bits -> 8 bits
	312	// * 16 bits -> 8 bits
	313	// * 8 bits -> 16 bits
	314	// * 16 bits -> 16 bits
	315
	316	int table_no, table_no2;
	317	int i_sign, i_swap;
	318
	319	switch (pcm_format->GetBPS()) {
	320	case 8:
	321	table_no = 0;
	322	break;
	323	case 16:
	324	table_no = 1;
	325	break;
	326	default:
	327	// TODO: Add something here: error, log, ...
dea7e44a	328	return false;
e8482f24 GL	329	}
	330	switch (pcm_format2->GetBPS()) {
	331	case 8:
	332	table_no2 = 0;
	333	break;
	334	case 16:
	335	table_no2 = 1;
	336	break;
	337	default:
	338	// TODO: Add something here: error, log, ...
dea7e44a	339	return false;
e8482f24 GL	340	}
	341
	342	if (pcm_format2->Signed() != pcm_format->Signed())
	343	i_sign = 1;
	344	else
	345	i_sign = 0;
	346
	347	#define MY_ORDER wxBYTE_ORDER
	348	#if wxBYTE_ORDER == wxLITTLE_ENDIAN
	349	#define OTHER_ORDER wxBIG_ENDIAN
	350	#else
	351	#define OTHER_ORDER wxLITTLE_ENDIAN
	352	#endif
	353
	354	// --------------------------------------------------------
	355	// Find the good converter !
	356
	357	if (pcm_format->GetOrder() == OTHER_ORDER) {
	358	if (pcm_format->GetOrder() == pcm_format2->GetOrder())
	359	i_swap = 2;
	360	else
	361	i_swap = 1;
	362	} else {
	363	if (pcm_format->GetOrder() == pcm_format2->GetOrder())
	364	i_swap = 0;
	365	else
	366	i_swap = 1;
	367	}
	368
	369	m_function_out = s_converters[table_no*2+table_no2][i_swap][i_sign];
	370	m_function_in = s_converters[table_no2*2+table_no][i_swap][i_sign];
	371	m_multiplier_out = s_converters_multip[table_no*2+table_no2];
	372	m_multiplier_in = s_converters_multip[table_no2*2+table_no2];
	373
	374	if (m_prebuffer)
	375	delete[] m_prebuffer;
	376
3103e8a9	377	// We try to minimize the need for dynamic memory allocation by preallocating a buffer. But
e8482f24 GL	378	// to be sure it will be efficient we minimize the best size.
e8482f24 GL	379	if (m_multiplier_in < m_multiplier_out) {
c42b1de6 GL	380	m_prebuffer_size = (wxUint32)(m_sndio->GetBestSize() *
	381	m_multiplier_out);
	382	m_best_size = (wxUint32)(m_sndio->GetBestSize() *
	383	m_multiplier_in);
e8482f24	384	} else {
c42b1de6 GL	385	m_prebuffer_size = (wxUint32)(m_sndio->GetBestSize() *
	386	m_multiplier_in);
	387	m_best_size = (wxUint32)(m_sndio->GetBestSize() *
	388	m_multiplier_out);
e8482f24 GL	389	}
	390
	391	m_prebuffer = new char[m_prebuffer_size];
	392
	393	bool SetSoundFormatReturn;
	394
	395	SetSoundFormatReturn = m_sndio->SetSoundFormat(*new_format);
	396	wxASSERT( SetSoundFormatReturn );
2b3644c7	397	wxUnusedVar( SetSoundFormatReturn );
e8482f24 GL	398
e8482f24 GL	399	m_sndformat = new_format;
dea7e44a	400	return true;
e8482f24 GL	401	}
	402
	403	wxUint32 wxSoundStreamPcm::GetWriteSize(wxUint32 len) const
	404	{
	405	// For the moment, it is simple but next time it will become more complicated
	406	// (Resampling)
	407	return (wxUint32)(len * m_multiplier_out);
	408	}
	409
	410	wxUint32 wxSoundStreamPcm::GetReadSize(wxUint32 len) const
	411	{
	412	return (wxUint32)(len / m_multiplier_in);
	413	}
	414
	415	// Resampling engine. NOT FINISHED and NOT INCLUDED but this is a first DRAFT.
	416
	417	#if 0
	418
	419	#define FLOATBITS 16
	420	#define INTBITS 16
	421	#define FLOATMASK 0xffff
	422	#define INTMASK 0xffff0000
	423
	424	void ResamplingShrink_##DEPTH##(const void source, void destination, wxUint32 len)
	425	{
	426	wxUint##DEPTH## source_data, dest_data;
	427	wxUint32 pos;
	428
	429	source_data = (wxUint##DEPTH## *)source;
	430	dest_data = (wxUint##DEPTH## *)destination;
	431
	432	pos = m_saved_pos;
	433	while (len > 0) {
	434	// Increment the position in the input buffer
	435	pos += m_pitch;
	436	if (pos & INTMASK) {
	437	pos &= FLOATMASK;
	438
	439	dest_data ++ = source_data;
	440	}
	441	len--;
	442	source_data++;
	443	}
	444	m_saved_pos = pos;
	445	}
	446	#endif