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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>
* \& c2 n9 P9 W: h<>TSuperPlayerform *SuperPlayerform;
typedef struct
{
/ _5 L" Q  j' R  v, V    DWORD dwCallback;
4 L6 z- F' n/ T/ t2 ?    DWORD dwItem;
    DWORD dwValue;
    DWORD dwOver;
    LPSTR lpstrAlgorithm;
    LPSTR lpstrQuality;
# W- A0 c7 e, ]& i. C( g4 O } MCI_DGV_SETAUDIO_PARMS;
. ]6 }3 J8 {+ L; }! b   
& h! J1 T6 j/ }$ C& v) r& O, | const MCI_SETAUDIO = 0x873;
; M2 x* h" S5 K  s5 d const MCI_SETVIDEO = 0x0876;
const MCI_DGV_SETAUDIO_SOURCE_LEFT=1;
1 f5 }( F# x: D! v const MCI_DGV_SETAUDIO_SOURCE_STEREO=0;
( Z; ?9 G9 Z3 [: c const MCI_DGV_SETAUDIO_SOURCE_RIGHT=2;
const MCI_DGV_SETAUDIO_SOURCE=0x4004;
5 U* L( e2 e9 Y, g! L/ k const MCI_DGV_SETAUDIO_VOLUME=0x4002;
const MAX_VOLUME=65535;
/ U, v( V0 o+ x1 Y/ W const MIN_VOLUME=0;</P>
5 T9 z2 c/ ^8 X2 ^; |<>void __fastcall TSuperPlayerform:RC(char &amp;S)
{
  //char str;
  MCI_DGV_SETAUDIO_PARMS s;
  int err;
3 `3 z; c2 Y3 {2 F  \- s# k  char buf[1001];
0 k9 r6 p; K5 q, [6 [6 R  //str=''L'';
6 }  Q; i, u9 l( ~3 E. e2 t* l# J  if (MediaPlayer1-&gt;DeviceID&gt;0)
: L- ?" x9 L) ~  {
% N1 e* Y! n, [$ o5 }4 K' A9 `    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO,MCI_SET_OFF,int(&amp;s));
- ^3 D9 {$ t2 `% u" ^    if (err!=0)
       mciGetErrorString(err,buf,sizeof(buf) );
% m  j9 Z/ V9 u    if (S=='C')
  C3 h2 B$ _/ ?8 l* p       s.dwValue=MCI_DGV_SETAUDIO_SOURCE_STEREO;
! ^8 ?2 S; N/ M4 Y' a1 m6 g- r    if (S=='L')
3 c6 P, `) V9 [% {" U0 X5 c       s.dwValue=MCI_DGV_SETAUDIO_SOURCE_LEFT;
2 N$ w+ e3 i2 p/ ^: u$ `' T    if (S=='R') s.dwValue=MCI_DGV_SETAUDIO_SOURCE_RIGHT;
       s.dwItem=MCI_DGV_SETAUDIO_SOURCE;
    const MCI_DGV_SETAUDIO_VALUE=0x01000000L;
; e* a# j4 Z/ k9 Q4 S6 s  D+ e" u    const MCI_DGV_SETAUDIO_ITEM=0x00800000L;
8 n% Q1 J- t- m3 J8 @) c! H( L3 u+ f    //(MCI_DGV_SETAUDIO_VALUE||MCI_DGV_SETAUDIO_ITEM)=0x01800000
    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO,0x01800000,int(&amp;s));
    if (err!=0)
; E6 ^9 a$ N, [5 b" Q. ~       mciGetErrorString(err,buf,sizeof(buf) );
    err=mciSendCommand(MediaPlayer1-&gt;DeviceID,MCI_SETAUDIO, MCI_SET_ON ,int(&amp;s));
% {# M" o0 K+ W$ a3 \2 f    if (err!=0)
      mciGetErrorString(err,buf,sizeof(buf) );
   }
}</P>
<> void __fastcall TSuperPlayerform::popnosoundClick(TObject *Sender)
{
+ T2 a2 I: A) Q1 T. E& Q9 ?     LRC('L');
     Label3-&gt;Caption=“左声道 ";
     tempchannel='L';
4 V1 q9 T, h' G  J  A; y( Y }
4 N* y# d* B5 H! ~//---------------------------------------------------------------------------</P>
<> void __fastcall TSuperPlayerform::popsoundClick(TObject *Sender)
0 r% q/ f1 f( s6 @# X5 V8 X0 i {
     LRC('R');
/ W% E8 x/ i3 D+ x. t( L( f* R% y     Label3-&gt;Caption="右声道 ";
- L; \) {* T3 w: e4 U     tempchannel='R';
}
//---------------------------------------------------------------------------</P>
+ V! q+ p; r2 O; u1 d<> void __fastcall TSuperPlayerform::steroClick(TObject *Sender)
{
     LRC('C');
$ r; n! d4 Z7 R2 Q3 g     Label3-&gt;Caption="立体声 ";
+ ~& C% n; `& {  w9 E     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)
lReturn=mciSendString("set right off",sReturn,32,0)
lReturn=mciSendString("setaudio left off",sReturn,32,0)
( K# N* X, ^, B# o. `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。
- @+ _. V5 N2 Z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
! l0 d0 o& F- n% ^/ LlReturn=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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