926c550dc5
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1258 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
204 lines
4.2 KiB
C++
204 lines
4.2 KiB
C++
#ifdef __GNUG__
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#pragma implementation "sndpcm.h"
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#endif
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#include "sndsnd.h"
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#include "sndpcm.h"
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#define WX_BIG_ENDIAN 0
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wxSoundPcmCodec::wxSoundPcmCodec()
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: wxSoundCodec()
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{
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m_orig_format.SetCodecCreate(FALSE);
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m_orig_format.SetCodecNo(WXSOUND_PCM);
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}
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wxSoundPcmCodec::~wxSoundPcmCodec()
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{
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}
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size_t wxSoundPcmCodec::GetByteRate() const
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{
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return (m_orig_format.GetBps()/8)*
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m_orig_format.GetSampleRate()*
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m_orig_format.GetChannels();
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}
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wxSoundDataFormat wxSoundPcmCodec::GetPreferredFormat(int codec) const
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{
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wxSoundDataFormat prefFormat;
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prefFormat = m_orig_format;
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return prefFormat;
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}
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// ---------------------------------------------------------------------------
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// Main part of the decoder
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// ---------------------------------------------------------------------------
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void wxSoundPcmCodec::Decode()
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{
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InitMode(DECODING);
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if (m_io_format == m_orig_format) {
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CopyToOutput();
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ExitMode();
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return;
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}
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// Swap bytes
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switch (m_io_format.GetBps()) {
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case 8:
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InputSign8();
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break;
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case 16:
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InputSwapAndSign16();
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break;
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case 32:
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case 64:
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default:
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break;
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}
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ExitMode();
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}
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// ---------------------------------------------------------------------------
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// Change the sign of a 8-bit sample.
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#define GET() (m_in_sound->GetChar())
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#define PUT(c) (m_out_sound->PutChar(c))
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void wxSoundPcmCodec::InputSign8()
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{
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unsigned char signer = 0;
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if (m_io_format.GetSign() != m_orig_format.GetSign())
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signer = 128;
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while (StreamOk())
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PUT(GET() + signer);
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}
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// ---------------------------------------------------------------------------
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// Swap bytes and change the sign of a 16-bit sample.
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void wxSoundPcmCodec::InputSwapAndSign16()
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{
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unsigned short signer1 = 0, signer2 = 0;
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bool swap = (m_io_format.GetByteOrder() != m_orig_format.GetByteOrder());
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register char temp, temp2;
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if (m_io_format.GetSign() != m_orig_format.GetSign()) {
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if (m_io_format.GetByteOrder() == wxSND_SAMPLE_LE)
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signer2 = 0x80;
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else
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signer1 = 0x80;
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}
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if (swap) {
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while (StreamOk()) {
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temp = GET();
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temp2 = GET();
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PUT(temp2 ^ signer2);
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if (!StreamOk()) {
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m_in_sound->WriteBack(temp);
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m_in_sound->WriteBack(temp2);
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break;
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}
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PUT(temp ^ signer1);
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}
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} else {
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while (StreamOk()) {
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temp = GET();
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PUT(temp ^ signer1);
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if (!StreamOk()) {
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m_in_sound->WriteBack(temp);
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break;
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}
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PUT(GET() ^ signer2);
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}
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}
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}
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// ---------------------------------------------------------------------------
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// Encoder part.
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// ---------------------------------------------------------------------------
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void wxSoundPcmCodec::OutputSign8()
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{
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unsigned char signer = 0;
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if (m_io_format.GetSign() != m_orig_format.GetSign())
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signer = 128;
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while (StreamOk())
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PUT((char)(GET() + signer));
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}
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// ---------------------------------------------------------------------------
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void wxSoundPcmCodec::OutputSwapAndSign16()
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{
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bool swap = (m_io_format.GetByteOrder() != m_orig_format.GetByteOrder());
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unsigned short signer1 = 0, signer2 = 0;
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register char temp, temp2;
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if (m_io_format.GetSign() != m_orig_format.GetSign())
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if (m_io_format.GetByteOrder() == wxSND_SAMPLE_LE)
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signer1 = 0x80;
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else
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signer2 = 0x80;
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if (swap) {
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while (StreamOk()) {
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temp = GET();
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temp2 = GET();
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PUT(temp2 ^ signer1);
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if (!StreamOk()) {
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m_in_sound->WriteBack(temp);
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m_in_sound->WriteBack(temp2);
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break;
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}
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PUT(temp ^ signer2);
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}
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} else {
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while (StreamOk()) {
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temp = GET();
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temp2 = GET();
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PUT(temp ^ signer1);
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if (!StreamOk()) {
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m_in_sound->WriteBack(temp);
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break;
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}
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PUT(temp2 ^ signer2);
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}
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}
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}
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// ---------------------------------------------------------------------------
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void wxSoundPcmCodec::Encode()
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{
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InitMode(ENCODING);
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if (m_io_format == m_orig_format) {
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CopyToOutput();
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ExitMode();
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return;
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}
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// Swap bytes
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switch (m_io_format.GetBps()) {
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case 8:
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OutputSign8();
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break;
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case 16:
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OutputSwapAndSign16();
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break;
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case 32:
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case 64:
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default:
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break;
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}
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ExitMode();
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}
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