商业编程-源码-音频技术源代码 MixerClasses_Src.zip

//============================================================================= // Copyright Langis Pitre 1998 // You may do whatever you want with this code, as long as you include this // copyright notice in your implementation files. //============================================================================= // MixerInfo.cpp // // Utility function to list all available options of your mixer device interface // //============================================================================= #include "stdafx.h" #include "MixerInfo.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif // Helper functions used by GetDevicesInfo static void PrintLineComponentType( int nIndent, MIXERLINE &line, FILE *file ); static void PrintControl( HMIXEROBJ mixer, MIXERLINE &line, MIXERCONTROL &control, FILE *file ); //============================================================================= // Name : GetDevicesInfo // // Descr. : Finds all the input and output lines, and all mixer controls // available through the audio mixer device. // // Use GetDevicesInfo() to find out the capabilities of your sound card. // Check the the file and note the type and number of destination (output) // lines, as well as the source (input) lines associated with every // destination line. Note also the type of the controls available. // You will need these to create your windows controls. // // Return : void // Arg : LPCSTR filename : //============================================================================= void GetDevicesInfo( LPCSTR filename ) { FILE *file; UINT nbMixers = mixerGetNumDevs(); if( nbMixers < 1 ) { AfxMessageBox( "No mixer device present" ); return; } HMIXER hMixer; if( mixerOpen( &hMixer, 0, 0, 0, 0 ) != MMSYSERR_NOERROR ) { AfxMessageBox( "Could not open mixer device" ); return; } file = fopen( filename, "w" ); if( file == NULL ) { AfxMessageBox("Could not open file."); return; } MIXERCAPS caps; if( mixerGetDevCaps( ( UINT )hMixer, &caps, sizeof( MIXERCAPS ) ) != MMSYSERR_NOERROR ) { fclose( file ); return; } fprintf( file, "Name of device: %s\n", caps.szPname ); fprintf( file, "Number of destination lines: %d\n\n", caps.cDestinations ); fprintf( file, "\nPay particular attention to the \"Component type\" and \"Control type\" lines.\n" "You will pass these to the Init() functions of the various CMixerBase-derived classes\n" "to specify which type of control you want to use.\n"); MIXERLINE line; MIXERLINECONTROLS mixerLineControl; MIXERCONTROL *pMixerControl; int nDest = caps.cDestinations; for( int i = 0; i < nDest; i++ ) { line.cbStruct = sizeof( MIXERLINE ); line.dwSource = 0; line.dwDestination = i; mixerGetLineInfo( ( HMIXEROBJ )hMixer, &line, MIXER_GETLINEINFOF_DESTINATION ); fprintf( file, "\n***************************************************************************************************\n"); fprintf( file, "** Destination line. Index = %d *******************************************************************\n", i ); fprintf( file, "***************************************************************************************************\n"); PrintLineComponentType( 0, line, file ); pMixerControl = new MIXERCONTROL[line.cControls]; ASSERT( pMixerControl != NULL ); mixerLineControl.cbStruct = sizeof( MIXERLINECONTROLS ); mixerLineControl.dwLineID = line.dwLineID; mixerLineControl.cControls = line.cControls; mixerLineControl.cbmxctrl = sizeof( MIXERCONTROL ); mixerLineControl.pamxctrl = pMixerControl; mixerGetLineControls( ( HMIXEROBJ )hMixer, &mixerLineControl, MIXER_GETLINECONTROLSF_ALL ); UINT ncontrols = line.cControls; for( UINT k = 0; k < ncontrols; k++ ) { PrintControl( ( HMIXEROBJ )hMixer, line, pMixerControl[k], file ); } delete[] pMixerControl; // for each destination line, list the source lines and their controls UINT nconn = line.cConnections; for( UINT j = 0; j < nconn; j++ ) { line.cbStruct = sizeof( MIXERLINE ); line.dwSource = j; line.dwDestination = i; mixerGetLineInfo( ( HMIXEROBJ )hMixer, &line, MIXER_GETLINEINFOF_SOURCE ); fprintf( file, "\n\t======================================================================================\n"); fprintf( file, "\t== Source line. Index = %d ===========================================================\n", j ); fprintf( file, "\t======================================================================================\n"); PrintLineComponentType( 1, line, file ); pMixerControl = new MIXERCONTROL[line.cControls]; ASSERT( pMixerControl != NULL ); mixerLineControl.cbStruct = sizeof( MIXERLINECONTROLS ); mixerLineControl.dwLineID = line.dwLineID; mixerLineControl.cControls = line.cControls; mixerLineControl.cbmxctrl = sizeof( MIXERCONTROL ); mixerLineControl.pamxctrl = pMixerControl; mixerGetLineControls( ( HMIXEROBJ )hMixer, &mixerLineControl, MIXER_GETLINECONTROLSF_ALL ); UINT ncontrols = line.cControls; for( UINT k = 0; k < ncontrols; k++ ) { PrintControl( ( HMIXEROBJ )hMixer, line, pMixerControl[k], file ); } delete[] pMixerControl; } } fclose( file ); } //<=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=> // Name : PrintLineComponentType // // Descr. : // // Return : void // Arg : MIXERLINE &line : // Arg : FILE *file : //------------------------------------------------------------------------------------------ void PrintLineComponentType( int nIndent, MIXERLINE &line, FILE *file ) { char *tabs; if( nIndent == 0 ) tabs = ""; else tabs = "\t"; fprintf( file, "%s -----------------------------------------------------------------------\n", tabs ); fprintf( file, "%s Component type :", tabs ); switch( line.dwComponentType ) { case MIXERLINE_COMPONENTTYPE_DST_DIGITAL: fprintf( file, "%s MIXERLINE_COMPONENTTYPE_DST_DIGITAL\n", tabs ); fprintf( file, "%s -----------------------------------------------------------------------\n", tabs ); fprintf( file, "%s Audio line is a digital destination (for example, digital input to a DAT or CD audio device).\n", tabs ); break; case MIXERLINE_COMPONENTTYPE_DST_UNDEFINED: fprintf( file, "%s MIXERLINE_COMPONENTTYPE_DST_UNDEFINED\n", tabs ); fprintf( file, "%s -----------------------------------------------------------------------\n", tabs ); fprintf( file, "%s Audio line is a destination that cannot be defined by one of the standard component types.\n", tabs ); break; case MIXERLINE_COMPONENTTYPE_DST_LINE: fprintf( file, "%s MIXERLINE_COMPONENTTYPE_DST_LINE\n", tabs); fprintf( file, "%s -----------------------------------------------------------------------\n", tabs ); fprintf( file, "%s Audio line is a line level destination that will be the final recording source for the analog-to-digital converter (ADC).\n", tabs ); break; case MIXERLINE_COMPONENTTYPE_DST_MONITOR: fprintf( file, "%s MIXERLINE_COMPONENTTYPE_DST_MONITOR\n", tabs); fprintf( file, "%s -----------------------------------------------------------------------\n", tabs ); fprintf( file, "%s Audio line is a destination used for a monitor.\n", tabs ); break; case MIXERLINE_COMPONENTTYPE_DST_SPEAKERS: fprintf( file, "%s MIXERLINE_COMPONENTTYPE_DST_SPEAKERS\n", tabs); fprintf( file, "%s -----------------------------------------------------------------------\n", tabs ); fprintf( file, "%s Audio line is an adjustable (gain and/or attenuation) destination intended to drive speakers.\n", tabs