sndwav.cpp

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

// --------------------------------------------------------------------------
// Name: sndwav.cpp
// Purpose:
// Date: 08/11/1999
// Author: Guilhem Lavaux <[e-mail]> (C) 1999
// CVSID: $Id: sndwav.cpp,v 1.9 2005/09/23 12:47:52 MR Exp $
// wxWindows licence
// --------------------------------------------------------------------------

#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& WXUNUSED(data), wxUint32 len,
                                  wxUint16 channels, 
                                  wxUint32 sample_fq, wxUint32 WXUNUSED(byte_p_sec),
                                  wxUint16 WXUNUSED(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 WXUNUSED(byte_p_sec),
                                      wxUint16 WXUNUSED(byte_p_spl), wxUint16 WXUNUSED(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& WXUNUSED(data), wxUint32 len,
                                   wxUint16 WXUNUSED(channels),
                                   wxUint32 sample_fq, wxUint32 WXUNUSED(byte_p_sec),
                                   wxUint16 WXUNUSED(byte_p_spl), wxUint16 WXUNUSED(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();
    wxUnusedVar(len);
    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 << (wxUint32)(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 WXUNUSED(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();
}