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

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

#include <wx/wxprec.h>

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

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#include "wx/stream.h"
#include "wx/datstrm.h"
#include "wx/filefn.h"
#include "wx/mstream.h"

#include "wx/mmedia/sndbase.h"
#include "wx/mmedia/sndcodec.h"
#include "wx/mmedia/sndfile.h"
#include "wx/mmedia/sndpcm.h"
#include "wx/mmedia/sndg72x.h"
#include "wx/mmedia/sndmsad.h"
#include "wx/mmedia/sndwav.h"

#define BUILD_SIGNATURE(a,b,c,d) (((wxUint32)a) | (((wxUint32)b) << 8) | (((wxUint32)c) << 16)  | (((wxUint32)d) << 24)) 

#define RIFF_SIGNATURE BUILD_SIGNATURE('R','I','F','F')
#define WAVE_SIGNATURE BUILD_SIGNATURE('W','A','V','E')
#define FMT_SIGNATURE BUILD_SIGNATURE('f','m','t',' ')
#define DATA_SIGNATURE BUILD_SIGNATURE('d','a','t','a')

#define HEADER_SIZE 4+4 + 4+4+16 + 4+4
// 4+4 => NAME + LEN
// 16 => fmt size

wxSoundWave::wxSoundWave(wxInputStream& stream, wxSoundStream& io_sound)
        : wxSoundFileStream(stream, io_sound)
{
    m_base_offset = wxInvalidOffset;
}

wxSoundWave::wxSoundWave(wxOutputStream& stream, wxSoundStream& io_sound)
        : wxSoundFileStream(stream, io_sound)
{
    m_base_offset = wxInvalidOffset;
}

wxSoundWave::~wxSoundWave()
{
}

wxString wxSoundWave::GetCodecName() const
{
    return wxString(wxT("wxSoundWave codec"));
}

#define FAIL_WITH(condition, err) if (condition) { m_snderror = err; return FALSE; }

bool wxSoundWave::CanRead()
{
    wxUint32 len, signature1, signature2;
    m_snderror = wxSOUND_NOERROR;

    // Test the main signatures:
    //   "RIFF"
    FAIL_WITH(m_input->Read(&signature1, 4).LastRead() != 4, wxSOUND_INVSTRM);
    
    if (wxUINT32_SWAP_ON_BE(signature1) != RIFF_SIGNATURE) {
        m_input->Ungetch(&signature1, 4);
        return FALSE;
    }

    // Pass the global length
    m_input->Read(&len, 4);
    FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);

    // Get the second signature
    FAIL_WITH(m_input->Read(&signature2, 4).LastRead() != 4, wxSOUND_INVSTRM);
    // Ungetch all
    m_input->Ungetch(&signature2, 4);
    m_input->Ungetch(&len, 4);
    m_input->Ungetch(&signature1, 4);

    // Test the second signature
    if (wxUINT32_SWAP_ON_BE(signature2) != WAVE_SIGNATURE)
        return FALSE;
    
    return TRUE;
}

bool wxSoundWave::HandleOutputPCM(wxDataInputStream& data, wxUint32 len,
                                  wxUint16 channels, 
                                  wxUint32 sample_fq, wxUint32 byte_p_sec,
                                  wxUint16 byte_p_spl, wxUint16 bits_p_spl)
{
    wxSoundFormatPcm sndformat;
    
    sndformat.SetSampleRate(sample_fq);
    sndformat.SetBPS(bits_p_spl);
    sndformat.SetChannels(channels);
    sndformat.Signed(TRUE);
    sndformat.SetOrder(wxLITTLE_ENDIAN);
    
    if (!SetSoundFormat(sndformat))
        return FALSE;
    
    m_input->SeekI(len, wxFromCurrent);

    return TRUE;
}

bool wxSoundWave::HandleOutputMSADPCM(wxDataInputStream& data, wxUint32 len,
                                      wxUint16 channels, 
                                      wxUint32 sample_fq, wxUint32 byte_p_sec,
                                      wxUint16 byte_p_spl, wxUint16 bits_p_spl)
{
    wxSoundFormatMSAdpcm sndformat;
    wxInt16 *coefs[2];
    wxUint16 coefs_len, i;
    wxUint16 block_size;
    
    sndformat.SetSampleRate(sample_fq);
    sndformat.SetChannels(channels);
    
    block_size = data.Read16();
    coefs_len = data.Read16();

    coefs[0] = new wxInt16[coefs_len];
    coefs[1] = new wxInt16[coefs_len];
    
    for (i=0;i<coefs_len;i++) {
        coefs[0][i] = data.Read16();
        coefs[1][i] = data.Read16();
    }

    sndformat.SetCoefs(coefs, 2, coefs_len);
    sndformat.SetBlockSize(block_size);

    delete[] coefs[0];
    delete[] coefs[1];
    
    if (!SetSoundFormat(sndformat))
        return FALSE;

    len -= coefs_len*4 + 4;
    
    m_input->SeekI(len, wxFromCurrent);
    
    return TRUE;
}

bool wxSoundWave::HandleOutputG721(wxDataInputStream& data, wxUint32 len,
                                   wxUint16 channels,
                                   wxUint32 sample_fq, wxUint32 byte_p_sec,
                                   wxUint16 byte_p_spl, wxUint16 bits_p_spl)
{
    wxSoundFormatG72X sndformat;
    
    sndformat.SetSampleRate(sample_fq);
    sndformat.SetG72XType(wxSOUND_G721);
    
    if (!SetSoundFormat(sndformat))
        return FALSE;
    
    m_input->SeekI(len, wxFromCurrent);

    return TRUE;
}

bool wxSoundWave::PrepareToPlay()
{
    wxUint32 signature, len;
    bool end_headers;
    
    if (!m_input) {
        m_snderror = wxSOUND_INVSTRM;
        return FALSE;
    }
    
    wxDataInputStream data(*m_input);
    data.BigEndianOrdered(FALSE);

    // Get the first signature
    FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
    FAIL_WITH(wxUINT32_SWAP_ON_BE(signature) != RIFF_SIGNATURE, wxSOUND_INVSTRM);
    // "RIFF"
    
    len = data.Read32();
    FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
    // dummy len

    // Get the second signature
    FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
    FAIL_WITH(wxUINT32_SWAP_ON_BE(signature) != WAVE_SIGNATURE, wxSOUND_INVSTRM);
    // "WAVE"
    
    end_headers = FALSE;
    // Chunk loop
    while (!end_headers) {
        FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
        
        len = data.Read32();
        FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
        
        switch (wxUINT32_SWAP_ON_BE(signature)) {
            case FMT_SIGNATURE: {  // "fmt "
                wxUint16 format, channels, byte_p_spl, bits_p_spl;
                wxUint32 sample_fq, byte_p_sec;

                // Get the common parameters
                data >> format >> channels >> sample_fq 
                     >> byte_p_sec >> byte_p_spl >> bits_p_spl;
                len -= 16;
                
                switch (format) {
                    case 0x01: // PCM
                        if (!HandleOutputPCM(data, len, channels, sample_fq,
                                             byte_p_sec, byte_p_spl,
                                             bits_p_spl))
                            return FALSE;
                        break;
                    case 0x02: // MS ADPCM
                        if (!HandleOutputMSADPCM(data, len,
                                                 channels, sample_fq,
                                                 byte_p_sec, byte_p_spl,
                                                 bits_p_spl))
                            return FALSE;
                        break;
                    case 0x40: // G721
                        if (!HandleOutputG721(data, len,
                                              channels, sample_fq,
                                              byte_p_sec, byte_p_spl,
                                              bits_p_spl))
                            return FALSE;
                        break;
                    default: 
                        m_snderror = wxSOUND_NOCODEC;
                        return FALSE;
                }
                break;
            }
            case DATA_SIGNATURE: // "data"
                m_base_offset = m_input->TellI();
                end_headers = TRUE;
                FinishPreparation(len);
                break;
            default:
                // We pass the chunk
                m_input->SeekI(len, wxFromCurrent);
                break;
        }
    }
    return TRUE;
}

wxSoundFormatBase *wxSoundWave::HandleInputPCM(wxDataOutputStream& data)
{
    wxUint16 format, channels, byte_p_spl, bits_p_spl;
    wxUint32 sample_fq, byte_p_sec;
    wxSoundFormatPcm *pcm;
    
    pcm = (wxSoundFormatPcm *)(m_sndformat->Clone());
    
    // Write block length
    data.Write32(16);
    
    sample_fq  = pcm->GetSampleRate();
    bits_p_spl = pcm->GetBPS();
    channels   = pcm->GetChannels();
    byte_p_spl = pcm->GetBPS() / 8;
    byte_p_sec = pcm->GetBytesFromTime(1);
    format     = 0x01;
    
    pcm->Signed(TRUE);
    pcm->SetOrder(wxLITTLE_ENDIAN);
    
    data << format << channels << sample_fq
         << byte_p_sec << byte_p_spl << bits_p_spl;
    
    return pcm;
}

wxSoundFormatBase *wxSoundWave::HandleInputG72X(wxDataOutputStream& data)
{
    wxUint16 format, channels, byte_p_spl, bits_p_spl;
    wxUint32 sample_fq, byte_p_sec;
    wxSoundFormatG72X *g72x;
    
    // Write block length
    data.Write32(16);
    
    g72x = (wxSoundFormatG72X *)(m_sndformat->Clone());
    if (g72x->GetG72XType() != wxSOUND_G721) {
        delete g72x;
        return NULL;
    } 
    
    sample_fq  = g72x->GetSampleRate();
    bits_p_spl = 4;
    channels   = 1;
    byte_p_spl = 0;
    byte_p_sec = g72x->GetBytesFromTime(1);
    format     = 0x40;
    data << format << channels << sample_fq
         << byte_p_sec << byte_p_spl << bits_p_spl;
    
    return g72x;
}

bool wxSoundWave::PrepareToRecord(wxUint32 time)
{
#define WRITE_SIGNATURE(s,sig) \
signature = sig; \
signature = wxUINT32_SWAP_ON_BE(signature); \
FAIL_WITH(s->Write(&signature, 4).LastWrite() != 4, wxSOUND_INVSTRM);
    
    wxUint32 signature;
    wxMemoryOutputStream fmt_data;
    
    if (!m_output) {
        m_snderror = wxSOUND_INVSTRM;
        return FALSE;
    }
    
    wxDataOutputStream data(*m_output);
    wxDataOutputStream fmt_d_data(fmt_data);
    
    data.BigEndianOrdered(FALSE);
    fmt_d_data.BigEndianOrdered(FALSE);
    
    WRITE_SIGNATURE(m_output, RIFF_SIGNATURE);
    
    FAIL_WITH(m_output->LastWrite() != 4, wxSOUND_INVSTRM);
    
    WRITE_SIGNATURE((&fmt_data), WAVE_SIGNATURE);
    
    {
        wxSoundFormatBase *frmt;
        
        WRITE_SIGNATURE((&fmt_data), FMT_SIGNATURE);
        
        switch (m_sndformat->GetType()) {
            case wxSOUND_PCM:
                frmt = HandleInputPCM(fmt_d_data);
                break;
            case wxSOUND_G72X:
                frmt = HandleInputG72X(fmt_d_data);
                break;
            default:
                m_snderror = wxSOUND_NOCODEC;
                return FALSE;
        }
        
        FAIL_WITH(!frmt, wxSOUND_NOCODEC);
        
        if (!SetSoundFormat(*frmt)) {
            delete frmt;
            return FALSE;
        }
        
        delete frmt;
    }
    
    data << (fmt_data.GetSize() + m_sndformat->GetBytesFromTime(time));

    // We, finally, copy the header block to the output stream 
    {
        char *out_buf;
        out_buf = new char[fmt_data.GetSize()];
        
        fmt_data.CopyTo(out_buf, fmt_data.GetSize());
        m_output->Write(out_buf, fmt_data.GetSize());
        
        delete[] out_buf;
    }
    
    WRITE_SIGNATURE(m_output, DATA_SIGNATURE);
    data.Write32(m_sndformat->GetBytesFromTime(time));
    return TRUE;
}

bool wxSoundWave::FinishRecording()
{
    if (m_output->SeekO(0, wxFromStart) == wxInvalidOffset)
        // We can't but there is no error.
        return TRUE;
    
    if (m_bytes_left == 0)
        return TRUE;
    
    // TODO: Update headers when we stop before the specified time (if possible)
    return TRUE;
}

bool wxSoundWave::RepositionStream(wxUint32 position)
{
    if (m_base_offset == wxInvalidOffset)
        return FALSE;
    m_input->SeekI(m_base_offset, wxFromStart);
    return TRUE;
}

wxUint32 wxSoundWave::GetData(void *buffer, wxUint32 len)
{
    return m_input->Read(buffer, len).LastRead();
}

wxUint32 wxSoundWave::PutData(const void *buffer, wxUint32 len)
{
    return m_output->Write(buffer, len).LastWrite();
}
Commit	Line	Data
e8482f24 GL	1	// --------------------------------------------------------------------------
	2	// Name: sndwav.cpp
	3	// Purpose:
	4	// Date: 08/11/1999
	5	// Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999
	6	// CVSID: $Id$
	7	// --------------------------------------------------------------------------
	8	#ifdef __GNUG__
	9	#pragma implementation "sndwav.cpp"
	10	#endif
	11
	12	#include <wx/wxprec.h>
	13
	14	#ifndef WX_PRECOMP
	15	#include "wx/defs.h"
	16	#endif
	17
	18	#ifdef __BORLANDC__
	19	#pragma hdrstop
	20	#endif
	21
	22	#include "wx/stream.h"
	23	#include "wx/datstrm.h"
	24	#include "wx/filefn.h"
	25	#include "wx/mstream.h"
	26
	27	#include "wx/mmedia/sndbase.h"
	28	#include "wx/mmedia/sndcodec.h"
	29	#include "wx/mmedia/sndfile.h"
	30	#include "wx/mmedia/sndpcm.h"
	31	#include "wx/mmedia/sndg72x.h"
c42b1de6	32	#include "wx/mmedia/sndmsad.h"
e8482f24 GL	33	#include "wx/mmedia/sndwav.h"
	34
	35	#define BUILD_SIGNATURE(a,b,c,d) (((wxUint32)a) \| (((wxUint32)b) << 8) \| (((wxUint32)c) << 16) \| (((wxUint32)d) << 24))
	36
	37	#define RIFF_SIGNATURE BUILD_SIGNATURE('R','I','F','F')
	38	#define WAVE_SIGNATURE BUILD_SIGNATURE('W','A','V','E')
	39	#define FMT_SIGNATURE BUILD_SIGNATURE('f','m','t',' ')
	40	#define DATA_SIGNATURE BUILD_SIGNATURE('d','a','t','a')
	41
	42	#define HEADER_SIZE 4+4 + 4+4+16 + 4+4
	43	// 4+4 => NAME + LEN
	44	// 16 => fmt size
	45
	46	wxSoundWave::wxSoundWave(wxInputStream& stream, wxSoundStream& io_sound)
	47	: wxSoundFileStream(stream, io_sound)
	48	{
	49	m_base_offset = wxInvalidOffset;
	50	}
	51
	52	wxSoundWave::wxSoundWave(wxOutputStream& stream, wxSoundStream& io_sound)
	53	: wxSoundFileStream(stream, io_sound)
	54	{
	55	m_base_offset = wxInvalidOffset;
	56	}
	57
	58	wxSoundWave::~wxSoundWave()
	59	{
	60	}
	61
	62	wxString wxSoundWave::GetCodecName() const
	63	{
	64	return wxString(wxT("wxSoundWave codec"));
	65	}
	66
	67	#define FAIL_WITH(condition, err) if (condition) { m_snderror = err; return FALSE; }
	68
	69	bool wxSoundWave::CanRead()
	70	{
	71	wxUint32 len, signature1, signature2;
	72	m_snderror = wxSOUND_NOERROR;
	73
	74	// Test the main signatures:
	75	// "RIFF"
	76	FAIL_WITH(m_input->Read(&signature1, 4).LastRead() != 4, wxSOUND_INVSTRM);
	77
	78	if (wxUINT32_SWAP_ON_BE(signature1) != RIFF_SIGNATURE) {
	79	m_input->Ungetch(&signature1, 4);
	80	return FALSE;
	81	}
	82
	83	// Pass the global length
	84	m_input->Read(&len, 4);
	85	FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
	86
	87	// Get the second signature
	88	FAIL_WITH(m_input->Read(&signature2, 4).LastRead() != 4, wxSOUND_INVSTRM);
	89	// Ungetch all
	90	m_input->Ungetch(&signature2, 4);
	91	m_input->Ungetch(&len, 4);
	92	m_input->Ungetch(&signature1, 4);
	93
	94	// Test the second signature
	95	if (wxUINT32_SWAP_ON_BE(signature2) != WAVE_SIGNATURE)
	96	return FALSE;
97
98	return TRUE;
99	}
100
c42b1de6 GL	101	bool wxSoundWave::HandleOutputPCM(wxDataInputStream& data, wxUint32 len,
c42b1de6 GL	102	wxUint16 channels,
e8482f24 GL	103	wxUint32 sample_fq, wxUint32 byte_p_sec,
	104	wxUint16 byte_p_spl, wxUint16 bits_p_spl)
	105	{
	106	wxSoundFormatPcm sndformat;
	107
	108	sndformat.SetSampleRate(sample_fq);
	109	sndformat.SetBPS(bits_p_spl);
	110	sndformat.SetChannels(channels);
	111	sndformat.Signed(TRUE);
	112	sndformat.SetOrder(wxLITTLE_ENDIAN);
	113
	114	if (!SetSoundFormat(sndformat))
	115	return FALSE;
	116
c42b1de6 GL	117	m_input->SeekI(len, wxFromCurrent);
c42b1de6 GL	118
e8482f24 GL	119	return TRUE;
	120	}
	121
c42b1de6 GL	122	bool wxSoundWave::HandleOutputMSADPCM(wxDataInputStream& data, wxUint32 len,
	123	wxUint16 channels,
	124	wxUint32 sample_fq, wxUint32 byte_p_sec,
	125	wxUint16 byte_p_spl, wxUint16 bits_p_spl)
	126	{
	127	wxSoundFormatMSAdpcm sndformat;
	128	wxInt16 *coefs[2];
	129	wxUint16 coefs_len, i;
	130	wxUint16 block_size;
	131
	132	sndformat.SetSampleRate(sample_fq);
	133	sndformat.SetChannels(channels);
	134
	135	block_size = data.Read16();
	136	coefs_len = data.Read16();
	137
	138	coefs[0] = new wxInt16[coefs_len];
	139	coefs[1] = new wxInt16[coefs_len];
	140
	141	for (i=0;i<coefs_len;i++) {
	142	coefs[0][i] = data.Read16();
	143	coefs[1][i] = data.Read16();
	144	}
	145
	146	sndformat.SetCoefs(coefs, 2, coefs_len);
	147	sndformat.SetBlockSize(block_size);
	148
	149	delete[] coefs[0];
	150	delete[] coefs[1];
	151
	152	if (!SetSoundFormat(sndformat))
	153	return FALSE;
	154
	155	len -= coefs_len*4 + 4;
	156
	157	m_input->SeekI(len, wxFromCurrent);
	158
	159	return TRUE;
	160	}
	161
	162	bool wxSoundWave::HandleOutputG721(wxDataInputStream& data, wxUint32 len,
	163	wxUint16 channels,
e8482f24 GL	164	wxUint32 sample_fq, wxUint32 byte_p_sec,
	165	wxUint16 byte_p_spl, wxUint16 bits_p_spl)
	166	{
	167	wxSoundFormatG72X sndformat;
	168
	169	sndformat.SetSampleRate(sample_fq);
	170	sndformat.SetG72XType(wxSOUND_G721);
	171
	172	if (!SetSoundFormat(sndformat))
	173	return FALSE;
	174
c42b1de6 GL	175	m_input->SeekI(len, wxFromCurrent);
c42b1de6 GL	176
e8482f24 GL	177	return TRUE;
	178	}
	179
	180	bool wxSoundWave::PrepareToPlay()
	181	{
	182	wxUint32 signature, len;
	183	bool end_headers;
	184
	185	if (!m_input) {
	186	m_snderror = wxSOUND_INVSTRM;
	187	return FALSE;
	188	}
	189
	190	wxDataInputStream data(*m_input);
	191	data.BigEndianOrdered(FALSE);
	192
	193	// Get the first signature
	194	FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
	195	FAIL_WITH(wxUINT32_SWAP_ON_BE(signature) != RIFF_SIGNATURE, wxSOUND_INVSTRM);
	196	// "RIFF"
	197
	198	len = data.Read32();
	199	FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
	200	// dummy len
	201
	202	// Get the second signature
	203	FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
	204	FAIL_WITH(wxUINT32_SWAP_ON_BE(signature) != WAVE_SIGNATURE, wxSOUND_INVSTRM);
	205	// "WAVE"
	206
	207	end_headers = FALSE;
	208	// Chunk loop
	209	while (!end_headers) {
	210	FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
	211
	212	len = data.Read32();
	213	FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
	214
	215	switch (wxUINT32_SWAP_ON_BE(signature)) {
	216	case FMT_SIGNATURE: { // "fmt "
	217	wxUint16 format, channels, byte_p_spl, bits_p_spl;
	218	wxUint32 sample_fq, byte_p_sec;
	219
	220	// Get the common parameters
	221	data >> format >> channels >> sample_fq
	222	>> byte_p_sec >> byte_p_spl >> bits_p_spl;
c42b1de6	223	len -= 16;
e8482f24 GL	224
	225	switch (format) {
	226	case 0x01: // PCM
c42b1de6 GL	227	if (!HandleOutputPCM(data, len, channels, sample_fq,
	228	byte_p_sec, byte_p_spl,
	229	bits_p_spl))
	230	return FALSE;
	231	break;
	232	case 0x02: // MS ADPCM
	233	if (!HandleOutputMSADPCM(data, len,
	234	channels, sample_fq,
	235	byte_p_sec, byte_p_spl,
	236	bits_p_spl))
e8482f24 GL	237	return FALSE;
	238	break;
	239	case 0x40: // G721
c42b1de6 GL	240	if (!HandleOutputG721(data, len,
	241	channels, sample_fq,
	242	byte_p_sec, byte_p_spl,
	243	bits_p_spl))
e8482f24 GL	244	return FALSE;
	245	break;
	246	default:
	247	m_snderror = wxSOUND_NOCODEC;
	248	return FALSE;
	249	}
	250	break;
	251	}
	252	case DATA_SIGNATURE: // "data"
	253	m_base_offset = m_input->TellI();
	254	end_headers = TRUE;
	255	FinishPreparation(len);
	256	break;
	257	default:
	258	// We pass the chunk
	259	m_input->SeekI(len, wxFromCurrent);
	260	break;
	261	}
	262	}
	263	return TRUE;
	264	}
	265
	266	wxSoundFormatBase *wxSoundWave::HandleInputPCM(wxDataOutputStream& data)
	267	{
	268	wxUint16 format, channels, byte_p_spl, bits_p_spl;
	269	wxUint32 sample_fq, byte_p_sec;
	270	wxSoundFormatPcm *pcm;
	271
	272	pcm = (wxSoundFormatPcm *)(m_sndformat->Clone());
	273
	274	// Write block length
	275	data.Write32(16);
	276
	277	sample_fq = pcm->GetSampleRate();
	278	bits_p_spl = pcm->GetBPS();
	279	channels = pcm->GetChannels();
	280	byte_p_spl = pcm->GetBPS() / 8;
	281	byte_p_sec = pcm->GetBytesFromTime(1);
	282	format = 0x01;
	283
	284	pcm->Signed(TRUE);
	285	pcm->SetOrder(wxLITTLE_ENDIAN);
	286
	287	data << format << channels << sample_fq
	288	<< byte_p_sec << byte_p_spl << bits_p_spl;
	289
	290	return pcm;
	291	}
	292
	293	wxSoundFormatBase *wxSoundWave::HandleInputG72X(wxDataOutputStream& data)
	294	{
	295	wxUint16 format, channels, byte_p_spl, bits_p_spl;
	296	wxUint32 sample_fq, byte_p_sec;
	297	wxSoundFormatG72X *g72x;
	298
	299	// Write block length
	300	data.Write32(16);
	301
	302	g72x = (wxSoundFormatG72X *)(m_sndformat->Clone());
	303	if (g72x->GetG72XType() != wxSOUND_G721) {
	304	delete g72x;
	305	return NULL;
	306	}
	307
308	sample_fq = g72x->GetSampleRate();
309	bits_p_spl = 4;
310	channels = 1;
311	byte_p_spl = 0;
312	byte_p_sec = g72x->GetBytesFromTime(1);
313	format = 0x40;
314	data << format << channels << sample_fq
315	<< byte_p_sec << byte_p_spl << bits_p_spl;
316
317	return g72x;
318	}
319
320	bool wxSoundWave::PrepareToRecord(wxUint32 time)
321	{
322	#define WRITE_SIGNATURE(s,sig) \
323	signature = sig; \
324	signature = wxUINT32_SWAP_ON_BE(signature); \
325	FAIL_WITH(s->Write(&signature, 4).LastWrite() != 4, wxSOUND_INVSTRM);
326
327	wxUint32 signature;
328	wxMemoryOutputStream fmt_data;
329
330	if (!m_output) {
331	m_snderror = wxSOUND_INVSTRM;
332	return FALSE;
333	}
334
335	wxDataOutputStream data(*m_output);
336	wxDataOutputStream fmt_d_data(fmt_data);
337
338	data.BigEndianOrdered(FALSE);
339	fmt_d_data.BigEndianOrdered(FALSE);
340
341	WRITE_SIGNATURE(m_output, RIFF_SIGNATURE);
342
343	FAIL_WITH(m_output->LastWrite() != 4, wxSOUND_INVSTRM);
344
345	WRITE_SIGNATURE((&fmt_data), WAVE_SIGNATURE);
346
347	{
348	wxSoundFormatBase *frmt;
349
350	WRITE_SIGNATURE((&fmt_data), FMT_SIGNATURE);
351
352	switch (m_sndformat->GetType()) {
353	case wxSOUND_PCM:
354	frmt = HandleInputPCM(fmt_d_data);
355	break;
356	case wxSOUND_G72X:
357	frmt = HandleInputG72X(fmt_d_data);
358	break;
359	default:
360	m_snderror = wxSOUND_NOCODEC;
361	return FALSE;
362	}
363
364	FAIL_WITH(!frmt, wxSOUND_NOCODEC);
365
366	if (!SetSoundFormat(*frmt)) {
367	delete frmt;
368	return FALSE;
369	}
370
371	delete frmt;
372	}
373
374	data << (fmt_data.GetSize() + m_sndformat->GetBytesFromTime(time));
375
376	// We, finally, copy the header block to the output stream
377	{
378	char *out_buf;
379	out_buf = new char[fmt_data.GetSize()];
380
381	fmt_data.CopyTo(out_buf, fmt_data.GetSize());
382	m_output->Write(out_buf, fmt_data.GetSize());
383
384	delete[] out_buf;
385	}
386
387	WRITE_SIGNATURE(m_output, DATA_SIGNATURE);
388	data.Write32(m_sndformat->GetBytesFromTime(time));
389	return TRUE;
390	}
391
392	bool wxSoundWave::FinishRecording()
393	{
394	if (m_output->SeekO(0, wxFromStart) == wxInvalidOffset)
395	// We can't but there is no error.
396	return TRUE;
397
398	if (m_bytes_left == 0)
399	return TRUE;
400
401	// TODO: Update headers when we stop before the specified time (if possible)
402	return TRUE;
403	}
404
405	bool wxSoundWave::RepositionStream(wxUint32 position)
406	{
407	if (m_base_offset == wxInvalidOffset)
408	return FALSE;
409	m_input->SeekI(m_base_offset, wxFromStart);
410	return TRUE;
411	}
412
413	wxUint32 wxSoundWave::GetData(void *buffer, wxUint32 len)
414	{
415	return m_input->Read(buffer, len).LastRead();
416	}
417
418	wxUint32 wxSoundWave::PutData(const void *buffer, wxUint32 len)
419	{
420	return m_output->Write(buffer, len).LastWrite();
421	}