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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;
typedef struct
. f! j9 ~8 H& Z, p0 B9 E {
: S) {1 X) h. _* l$ R6 j    DWORD dwCallback;
( l" o, B3 z1 m! C+ Y6 }) A+ ~    DWORD dwItem;
1 b; n4 m; ?; H, A  [6 e    DWORD dwValue;
: @& h: V1 m7 L: [2 u9 R# j; j0 W3 s' Z    DWORD dwOver;
    LPSTR lpstrAlgorithm;
    LPSTR lpstrQuality;
& h& K/ \5 Z' l" Z" C6 z } MCI_DGV_SETAUDIO_PARMS;
( f4 y9 N9 R$ A( ^. |# R- u, r   
const MCI_SETAUDIO = 0x873;
const MCI_SETVIDEO = 0x0876;
const MCI_DGV_SETAUDIO_SOURCE_LEFT=1;
4 f8 z. M( M' b! z4 ^4 k: B const MCI_DGV_SETAUDIO_SOURCE_STEREO=0;
const MCI_DGV_SETAUDIO_SOURCE_RIGHT=2;
const MCI_DGV_SETAUDIO_SOURCE=0x4004;
) y( P( ]- x4 g8 C0 v const MCI_DGV_SETAUDIO_VOLUME=0x4002;
: X# \8 C2 Q! Y1 G! }2 [" q7 i6 ~ const MAX_VOLUME=65535;
6 l) F3 h/ l! T6 m* B" ~" Q. d const MIN_VOLUME=0;</P>
" R. z& H9 o  E( J<>void __fastcall TSuperPlayerform:RC(char &amp;S)
& B7 n  G! W# z2 o8 v$ i; u& e1 { {
1 W/ u, c% B+ Z8 b* t9 Z  //char str;
  MCI_DGV_SETAUDIO_PARMS s;
4 O; z( B- Z* t( Y1 K0 F  int err;
  char buf[1001];
* Z9 d- h* A; g5 W% X  //str=''L'';
  if (MediaPlayer1-&gt;DeviceID&gt;0)
; N. \9 w0 _: q2 i& E. s# Z8 H  {
, p& Y  [6 t! Y3 C4 K    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO,MCI_SET_OFF,int(&amp;s));
    if (err!=0)
% v0 o1 C' R$ I5 I% L1 H' v       mciGetErrorString(err,buf,sizeof(buf) );
8 V. W/ W( n# J$ t    if (S=='C')
' v( H3 _9 f2 }       s.dwValue=MCI_DGV_SETAUDIO_SOURCE_STEREO;
% G5 ~' l9 X2 ]    if (S=='L')
       s.dwValue=MCI_DGV_SETAUDIO_SOURCE_LEFT;
! P" _. _- c# e  ~    if (S=='R') s.dwValue=MCI_DGV_SETAUDIO_SOURCE_RIGHT;
6 @$ a1 P  x' Y7 k* C# T' U1 O$ Z       s.dwItem=MCI_DGV_SETAUDIO_SOURCE;
* t7 q7 l3 W( s) m; [    const MCI_DGV_SETAUDIO_VALUE=0x01000000L;
: Y' ^( ?" I$ ]. e    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));
2 Y" f" V" C6 ~+ C4 b  P+ P* y    if (err!=0)
       mciGetErrorString(err,buf,sizeof(buf) );
    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO, MCI_SET_ON ,int(&amp;s));
$ [- F( H" }6 g: u! K( \; L    if (err!=0)
      mciGetErrorString(err,buf,sizeof(buf) );
5 Q7 S% Q- {" m   }
}</P>
/ T* k4 C4 `6 R4 d* |<> void __fastcall TSuperPlayerform::popnosoundClick(TObject *Sender)
{
     LRC('L');
1 n' d0 Q( A  j4 F: G0 C     Label3-&gt;Caption=“左声道 ";
     tempchannel='L';
& y# B" h8 l9 T: g2 |7 Y }
; _( N# E, K, |5 `1 t! h* q//---------------------------------------------------------------------------</P>
<> void __fastcall TSuperPlayerform::popsoundClick(TObject *Sender)
{
1 z/ s1 A9 O7 a     LRC('R');
     Label3-&gt;Caption="右声道 ";
* ?* i: R$ A) U& ]     tempchannel='R';
}
+ C$ }# q8 \. T  f) f$ q//---------------------------------------------------------------------------</P>
1 _$ L* c3 h, w<> void __fastcall TSuperPlayerform::steroClick(TObject *Sender)
! V6 n2 M6 Y9 S( G# Z5 N {
6 r- t. ^! O3 D+ I     LRC('C');
7 n6 g/ i! M. r2 l     Label3-&gt;Caption="立体声 ";
6 _' K0 z0 W/ y- s7 G! Y; L  j     tempchannel='C';
}</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)
! K" L- h; r; @4 S# \$ I- _* xlReturn=mciSendString("set right off",sReturn,32,0)
lReturn=mciSendString("setaudio left off",sReturn,32,0)
/ Q- ?* @9 ]! e* h( S) l+ L$ ZlReturn=mciSendString("setaudio right off",sReturn,32,0)
4 ?, ]( S) F  e( K3 e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：
lReturn=mciSendString("setaudio source to left",sReturn,32,0) '仅开左声道
: r0 T) Y+ {: C0 |8 J3 g* xlReturn=mciSendString("setaudio source to right",sReturn,32,0) '仅开右声道
0 y# s" ?2 U, xlReturn=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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