如何在Inno Setup中使用BASS库使音频静音(更改音量) [英] How to mute audio (change volume) with BASS library in Inno Setup
本文介绍了如何在Inno Setup中使用BASS库使音频静音(更改音量)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
此代码来自低音音频库打开/关闭按钮,它执行暂停",如何将其更改为静音" ?
This code from Bass Audio Library on/off Button does "Pause", how to change it to "Mute"?
我应该改变什么?
const
BASS_SAMPLE_LOOP = 4;
BASS_ACTIVE_STOPPED = 0;
BASS_ACTIVE_PLAYING = 1;
BASS_ACTIVE_STALLED = 2;
BASS_ACTIVE_PAUSED = 3;
BASS_UNICODE = $80000000;
BASS_CONFIG_GVOL_STREAM = 5;
const
#ifndef UNICODE
EncodingFlag = 0;
#else
EncodingFlag = BASS_UNICODE;
#endif
type
HSTREAM = DWORD;
function BASS_Init(device: LongInt; freq, flags: DWORD;
win: HWND; clsid: Cardinal): BOOL;
external 'BASS_Init@files:bass.dll stdcall';
function BASS_StreamCreateFile(mem: BOOL; f: string; offset1: DWORD;
offset2: DWORD; length1: DWORD; length2: DWORD; flags: DWORD): HSTREAM;
external 'BASS_StreamCreateFile@files:bass.dll stdcall';
function BASS_Start: BOOL;
external 'BASS_Start@files:bass.dll stdcall';
function BASS_Pause: BOOL;
external 'BASS_Pause@files:bass.dll stdcall';
function BASS_ChannelPlay(handle: DWORD; restart: BOOL): BOOL;
external 'BASS_ChannelPlay@files:bass.dll stdcall';
function BASS_SetConfig(option: DWORD; value: DWORD ): BOOL;
external 'BASS_SetConfig@files:bass.dll stdcall';
function BASS_ChannelIsActive(handle: DWORD): DWORD;
external 'BASS_ChannelIsActive@files:bass.dll stdcall';
function BASS_Free: BOOL;
external 'BASS_Free@files:bass.dll stdcall';
var
SoundStream: HSTREAM;
SoundCtrlButton: TNewButton;
procedure SoundCtrlButtonClick(Sender: TObject);
begin
case BASS_ChannelIsActive(SoundStream) of
BASS_ACTIVE_PLAYING:
begin
if BASS_Pause then
SoundCtrlButton.Caption :=
ExpandConstant('{cm:SoundCtrlButtonCaptionSoundOn}');
end;
BASS_ACTIVE_PAUSED:
begin
if BASS_Start then
SoundCtrlButton.Caption :=
ExpandConstant('{cm:SoundCtrlButtonCaptionSoundOff}');
end;
end;
end;
procedure InitializeWizard;
begin
ExtractTemporaryFile('tune.mp3');
if BASS_Init(-1, 44100, 0, 0, 0) then
begin
SoundStream := BASS_StreamCreateFile(False,
ExpandConstant('{tmp}\tune.mp3'), 0, 0, 0, 0,
EncodingFlag or BASS_SAMPLE_LOOP);
BASS_SetConfig(BASS_CONFIG_GVOL_STREAM, 2500);
BASS_ChannelPlay(SoundStream, False);
SoundCtrlButton := TNewButton.Create(WizardForm);
SoundCtrlButton.Parent := WizardForm;
SoundCtrlButton.Left := 8;
SoundCtrlButton.Top := WizardForm.ClientHeight -
SoundCtrlButton.Height - 8;
SoundCtrlButton.Width := 40;
SoundCtrlButton.Caption :=
ExpandConstant('{cm:SoundCtrlButtonCaptionSoundOff}');
SoundCtrlButton.OnClick := @SoundCtrlButtonClick;
end;
end;
procedure DeinitializeSetup;
begin
BASS_Free;
end;
推荐答案
To control volume level, use the BASS_SetConfig
with option
set to:
-
为流"创建
-
BASS_CONFIG_GVOL_STREAM
,例如使用BASS_StreamCreateFile
;
为音乐" -
BASS_CONFIG_GVOL_MUSIC
创建的使用BASS_MusicLoad
.
BASS_CONFIG_GVOL_STREAM
for "stream", created e.g. using theBASS_StreamCreateFile
;BASS_CONFIG_GVOL_MUSIC
for "music", created e.g. usingBASS_MusicLoad
.
SoundCtrlButtonClick
代替了您问题中同名函数的暂停/恢复实现.
The SoundCtrlButtonClick
is replacement for the pause/resume implementation of the same-named function from your question.
var
Muted: Boolean;
procedure SoundCtrlButtonClick(Sender: TObject);
begin
if not Muted then
begin
if BASS_SetConfig(BASS_CONFIG_GVOL_STREAM, 0) then
begin
SoundCtrlButton.Caption := 'unmute';
Muted := True;
end;
end
else
begin
if BASS_SetConfig(BASS_CONFIG_GVOL_STREAM, 2500) then
begin
SoundCtrlButton.Caption := 'mute';
Muted := False;
end;
end;
end;
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