bool wxSoundFileStream::Record(wxUint32 time)
{
if (m_state != wxSOUND_FILE_STOPPED)
return false;
if (!PrepareToRecord(time))
return false;
FinishPreparation(m_sndformat->GetBytesFromTime(time));
m_state = wxSOUND_FILE_RECORDING;
if (!StartProduction(wxSOUND_INPUT))
return false;
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;
}
