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标题: 关于多媒体播放器VCD左右声道问题的BC代码 [打印本页]

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作者: kmusttywyc    时间: 2004-9-30 19:11
标题: 关于多媒体播放器VCD左右声道问题的BC代码
<>关于多媒体播放器在CB下声道转换的原代码！（DEPHI版的网上有）</P>
<>TSuperPlayerform *SuperPlayerform;
1 P7 D9 S. Z$ v6 g6 q- Z* f- Q+ e typedef struct
0 f' p# ^& m1 _8 ?9 o! d" x {
; ?) e+ I5 O3 x  |: k    DWORD dwCallback;
    DWORD dwItem;
    DWORD dwValue;
' N' u  Q, L* `5 X8 v: H4 _    DWORD dwOver;
- S8 p* {' h: Y; t: ]    LPSTR lpstrAlgorithm;
    LPSTR lpstrQuality;
( {2 ]6 Y6 z- M } MCI_DGV_SETAUDIO_PARMS;
0 B" G1 J7 W' K8 H   
" X  _+ c0 L1 i2 |8 T const MCI_SETAUDIO = 0x873;
const MCI_SETVIDEO = 0x0876;
: {& u4 I6 X. z const MCI_DGV_SETAUDIO_SOURCE_LEFT=1;
const MCI_DGV_SETAUDIO_SOURCE_STEREO=0;
const MCI_DGV_SETAUDIO_SOURCE_RIGHT=2;
/ Y4 g& t& `' D" Z) Y/ u const MCI_DGV_SETAUDIO_SOURCE=0x4004;
: L. p- L- g! |5 `2 e0 l const MCI_DGV_SETAUDIO_VOLUME=0x4002;
const MAX_VOLUME=65535;
; o% |" h6 U$ x% D, C const MIN_VOLUME=0;</P>
<>void __fastcall TSuperPlayerform:RC(char &amp;S)
{
5 V6 ?/ k! k2 \. l$ ]! X9 @5 @* F* ~+ P! V  //char str;
% G  {' W& Y6 @6 F  MCI_DGV_SETAUDIO_PARMS s;
  int err;
  char buf[1001];
  //str=''L'';
  if (MediaPlayer1-&gt;DeviceID&gt;0)
  {
$ n& o# Z/ s6 x9 g; N7 f/ J% \    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO,MCI_SET_OFF,int(&amp;s));
$ c5 [& {/ ]+ p    if (err!=0)
       mciGetErrorString(err,buf,sizeof(buf) );
    if (S=='C')
  ?( P, `" ?9 e% C# B6 i9 h       s.dwValue=MCI_DGV_SETAUDIO_SOURCE_STEREO;
    if (S=='L')
2 z, g, w# ?% z  j! k       s.dwValue=MCI_DGV_SETAUDIO_SOURCE_LEFT;
. L- Q0 m6 U! d    if (S=='R') s.dwValue=MCI_DGV_SETAUDIO_SOURCE_RIGHT;
       s.dwItem=MCI_DGV_SETAUDIO_SOURCE;
. h- D  o" G4 p0 s9 \, \: X& i    const MCI_DGV_SETAUDIO_VALUE=0x01000000L;
    const MCI_DGV_SETAUDIO_ITEM=0x00800000L;
    //(MCI_DGV_SETAUDIO_VALUE||MCI_DGV_SETAUDIO_ITEM)=0x01800000
    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO,0x01800000,int(&amp;s));
    if (err!=0)
6 E" O8 v% C% U1 E& k       mciGetErrorString(err,buf,sizeof(buf) );
    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO, MCI_SET_ON ,int(&amp;s));
    if (err!=0)
( H! \) ~9 I3 s& L3 J      mciGetErrorString(err,buf,sizeof(buf) );
( n  \& |1 K3 K9 n   }
1 g. y/ H6 v% h$ i+ y }</P>
4 N" g, L) T, k7 M<> void __fastcall TSuperPlayerform::popnosoundClick(TObject *Sender)
{
     LRC('L');
: E7 B7 l6 ~: e4 V     Label3-&gt;Caption=“左声道 ";
     tempchannel='L';
}
//---------------------------------------------------------------------------</P>
- F8 i( _; ~! i# @8 E/ y& `6 B6 R<> void __fastcall TSuperPlayerform::popsoundClick(TObject *Sender)
' ~5 T6 m: j( ^! P, }- I% k {
     LRC('R');
     Label3-&gt;Caption="右声道 ";
7 L; Q) p% \6 M4 R     tempchannel='R';
- o) C9 m' A# p }
//---------------------------------------------------------------------------</P>
7 c* S9 h( v) E; U8 a& y" Q! G" j<> void __fastcall TSuperPlayerform::steroClick(TObject *Sender)
1 n# {( }6 \+ @" | {
, Y& s" i  ~0 v) ?% y     LRC('C');
     Label3-&gt;Caption="立体声 ";
     tempchannel='C';
. M& ~. B- H7 [- d }</P>

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作者: ilikenba    时间: 2004-9-30 20:30
<>左右声道的设置代码！从网上找到的！</P><>lReturn=mciSendString("set left off",sReturn,32,0)
: y' L. w% z- B; X5 v% SlReturn=mciSendString("set right off",sReturn,32,0)
lReturn=mciSendString("setaudio left off",sReturn,32,0)
( S( m  K4 a2 C: S# c$ j2 T8 olReturn=mciSendString("setaudio right off",sReturn,32,0)
确切地说，以上四句关闭的并不是左右声道，而是左右音箱。由于通常的多媒体音频流多是立体声的，并不是左音箱播放的完全是左声道的音频流，其中掺入轻微的右声道声音，以达到更好的立体效果。
要想关闭左右声道可以这样：
& P7 e4 u: A( Y/ ~- X( HlReturn=mciSendString("setaudio source to left",sReturn,32,0) '仅开左声道
lReturn=mciSendString("setaudio source to right",sReturn,32,0) '仅开右声道
lReturn=mciSendString("setaudio source to average",sReturn,32,0) '左右平均
lReturn=mciSendString("setaudio source to stereo",sReturn,32,0) '立体声，这是默认设置</P>

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