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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;
# B2 S" v* `3 n" t2 y7 Q, K typedef struct
{
- {  A2 r: O* w    DWORD dwCallback;
* f& F4 \, ?. L5 T    DWORD dwItem;
" g7 a  ]) G% k8 ]) _) B    DWORD dwValue;
    DWORD dwOver;
    LPSTR lpstrAlgorithm;
% |* N; `, h7 R    LPSTR lpstrQuality;
! q( V/ S% W9 G2 ]% f8 p } MCI_DGV_SETAUDIO_PARMS;
: H- \9 m( M  J% {   
const MCI_SETAUDIO = 0x873;
! R4 [0 B6 `9 Q- P* P7 z: }3 n const MCI_SETVIDEO = 0x0876;
const MCI_DGV_SETAUDIO_SOURCE_LEFT=1;
const MCI_DGV_SETAUDIO_SOURCE_STEREO=0;
0 Z  z& j% Q- i# j. R9 Z const MCI_DGV_SETAUDIO_SOURCE_RIGHT=2;
const MCI_DGV_SETAUDIO_SOURCE=0x4004;
const MCI_DGV_SETAUDIO_VOLUME=0x4002;
const MAX_VOLUME=65535;
; w8 g9 n2 [2 P const MIN_VOLUME=0;</P>
<>void __fastcall TSuperPlayerform:RC(char &amp;S)
{
  //char str;
  MCI_DGV_SETAUDIO_PARMS s;
  int err;
  char buf[1001];
5 {9 n. A/ N4 I1 I  //str=''L'';
  if (MediaPlayer1-&gt;DeviceID&gt;0)
2 C+ J1 b; Y  E  {
5 x5 K2 \. }8 N+ k3 N" W    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO,MCI_SET_OFF,int(&amp;s));
    if (err!=0)
       mciGetErrorString(err,buf,sizeof(buf) );
9 u: Y7 t9 J9 U    if (S=='C')
3 `5 C1 |% ~! z0 M8 |. B5 K+ p1 _* L+ @       s.dwValue=MCI_DGV_SETAUDIO_SOURCE_STEREO;
    if (S=='L')
       s.dwValue=MCI_DGV_SETAUDIO_SOURCE_LEFT;
    if (S=='R') s.dwValue=MCI_DGV_SETAUDIO_SOURCE_RIGHT;
: t0 s9 m8 }) \  G, O       s.dwItem=MCI_DGV_SETAUDIO_SOURCE;
4 R# {% i" @1 C$ Q0 z; ~! ]    const MCI_DGV_SETAUDIO_VALUE=0x01000000L;
    const MCI_DGV_SETAUDIO_ITEM=0x00800000L;
    //(MCI_DGV_SETAUDIO_VALUE||MCI_DGV_SETAUDIO_ITEM)=0x01800000
$ L# V- S# l# R' F! X3 ]: I    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO,0x01800000,int(&amp;s));
0 l' Y, g3 |+ F- [$ T3 E/ d# b    if (err!=0)
       mciGetErrorString(err,buf,sizeof(buf) );
    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO, MCI_SET_ON ,int(&amp;s));
    if (err!=0)
, ?5 L. m; L, U      mciGetErrorString(err,buf,sizeof(buf) );
   }
}</P>
( e" J3 K3 s6 k* Z2 A<> void __fastcall TSuperPlayerform::popnosoundClick(TObject *Sender)
1 r: y4 h. @2 B' u {
     LRC('L');
     Label3-&gt;Caption=“左声道 ";
2 ]+ f- ?. X4 ?4 I     tempchannel='L';
5 c* v" Z" U0 B; F7 p }
//---------------------------------------------------------------------------</P>
9 @/ u7 G8 c" u0 s8 c" J<> void __fastcall TSuperPlayerform::popsoundClick(TObject *Sender)
{
     LRC('R');
     Label3-&gt;Caption="右声道 ";
     tempchannel='R';
0 z* X( V  u* N3 m. N$ M }
//---------------------------------------------------------------------------</P>
<> void __fastcall TSuperPlayerform::steroClick(TObject *Sender)
{
     LRC('C');
     Label3-&gt;Caption="立体声 ";
  a, r/ P2 a8 h% i" K     tempchannel='C';
. m7 c# S9 j- H. Y }</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)
$ Z( \0 I. p/ A0 L) m' KlReturn=mciSendString("set right off",sReturn,32,0)
) ]5 Z/ M. ]8 {3 L/ n2 C9 I5 vlReturn=mciSendString("setaudio left off",sReturn,32,0)
lReturn=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：
lReturn=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
! T+ D; R7 {. u/ FlReturn=mciSendString("setaudio source to stereo",sReturn,32,0) '立体声，这是默认设置</P>

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