The Windows Audio Mixer |
The mixer controls the routing of audio lines to a device for playing or recording.
La mezcladora controla el ruteo de líneas de audio a un dispositivo para reproducción o grabación.
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| Problem 1 |
| Create a Dialog application called MixerInfo using Wintempla to test the audio mixer in Microsoft Windows. After creating the project, edit the stdafx.h file to include the header files for multimedia (the ADC and the DAC). Then, insert a list view control to display the mixer devices. Cree una aplicación de diálogo llamada MixerInfo usando Wintempla para probar la mezcladora de audio en Microsoft Windows. Después de crear el proyecto, edite el archivo stdafx.h para incluir los archivos de encabezado para multimedia (el ADC y el DAC). Entonces, inserte un control de list view para mostrar los dispositivos de la mezcladora. |
| stdafx.h |
| // stdafx.h : include file for standard system include files, // or project specific include files that are used frequently, but // are changed infrequently // . . . #define WIN_DAC_ADC_SUPPORT . . . |
| MixerInfo.cpp |
| . . . void MixerInfo::Window_Open(Win::Event& e) { //_______________________________________________________________________ 1. lvDevice lvDevice.Cols.Add(0, LVCFMT_LEFT, 250, L"Mixer"); lvDevice.Cols.Add(1, LVCFMT_LEFT, 120, L"Mixer Line"); lvDevice.Cols.Add(2, LVCFMT_LEFT, 45, L"#ctrl"); lvDevice.Cols.Add(3, LVCFMT_LEFT, 220, L"Component Type"); lvDevice.Cols.Add(4, LVCFMT_LEFT, 90, L"Ctrl Name"); lvDevice.Cols.Add(5, LVCFMT_RIGHT, 60, L"Ctrl ID"); lvDevice.Cols.Add(6, LVCFMT_RIGHT, 40, L"Min"); lvDevice.Cols.Add(7, LVCFMT_RIGHT, 80, L"Max"); lvDevice.Cols.Add(8, LVCFMT_RIGHT, 80, L"Value"); //_______________________________________________________________________ 2. Variable const DWORD numMixers = ::mixerGetNumDevs(); DWORD mixerIndex, destination, control; MMRESULT mmr = 0; HMIXER mixer = 0; MIXERCAPS mixerCaps; MIXERLINE mixerLine; MIXERLINECONTROLS mxlc; MIXERCONTROL mxc[32]; MIXERCONTROLDETAILS mxcd; MIXERCONTROLDETAILS_UNSIGNED mxcdVol; mixerLine.cbStruct = sizeof(MIXERLINE); int i = 0; wchar_t text[64]; for (mixerIndex = 0; mixerIndex < numMixers; mixerIndex++) { //______________________________________________________________________ 3. For each device mmr = ::mixerGetDevCaps(mixerIndex, &mixerCaps, sizeof (MIXERCAPS)); if (mmr != MMSYSERR_NOERROR) { this->MessageBox(Mm::Assistant::GetErrorText(mmr), L"mixerGetDevCaps", MB_OK | MB_ICONERROR); return; } //____________________________________________________________________ 4. For each destination for (destination = 0; destination < mixerCaps.cDestinations; destination++) { memset(&mixerLine, 0, sizeof(MIXERLINE)); mixerLine.cbStruct = sizeof(MIXERLINE); mixerLine.dwDestination = destination; mixerLine.dwSource = -1; //mmr = ::mixerGetLineInfo((HMIXEROBJ)(UINT_PTR)mixerIndex, &mixerLine, MIXER_OBJECTF_MIXER|MIXER_GETLINEINFOF_SOURCE); mmr = ::mixerGetLineInfo((HMIXEROBJ)(UINT_PTR)mixerIndex, &mixerLine, MIXER_OBJECTF_MIXER|MIXER_OBJECTF_MIXER|MIXER_GETLINEINFOF_DESTINATION); if (mmr != MMSYSERR_NOERROR) { this->MessageBox(Mm::Assistant::GetErrorText(mmr), L"mixerGetLineInfo", MB_OK | MB_ICONERROR); return; } mxlc.cbStruct = sizeof(MIXERLINECONTROLS); mxlc.dwLineID = mixerLine.dwLineID; mxlc.cControls = mixerLine.cControls; mxlc.cbmxctrl = sizeof(MIXERCONTROL); mxlc.pamxctrl = mxc; mmr = ::mixerGetLineControls((HMIXEROBJ)(UINT_PTR)mixerIndex, &mxlc, MIXER_OBJECTF_MIXER | MIXER_GETLINECONTROLSF_ALL); if (mmr != MMSYSERR_NOERROR) { this->MessageBox(Mm::Assistant::GetErrorText(mmr), L"mixerGetLineControls", MB_OK | MB_ICONERROR); return; } mxcd.cChannels = 1; mxcd.cMultipleItems = 0; mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_UNSIGNED); mxcd.paDetails = &mxcdVol; mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS); //_________________________________________________________________ 5. For each control for (control = 0; control < mixerLine.cControls; control++) { lvDevice.AddItem(i, mixerCaps.szPname, 0, 0); lvDevice.SetItemText(i, 1, mixerLine.szName); _snwprintf_s(text, 64, _TRUNCATE, L"%u", mixerLine.cControls); lvDevice.SetItemText(i, 2, text); lvDevice.SetItemText(i, 3, Mm::Assistant::GetComponentTypeText(mixerLine.dwComponentType)); lvDevice.SetItemText(i, 4, mxc[control].szName); _snwprintf_s(text, 64, _TRUNCATE, L"%u", mxc[control].dwControlID); lvDevice.SetItemText(i, 5, text); _snwprintf_s(text, 64, _TRUNCATE, L"%u", mxc[control].Bounds.dwMinimum); lvDevice.SetItemText(i, 6, text); _snwprintf_s(text, 64, _TRUNCATE, L"%u", mxc[control].Bounds.dwMaximum); lvDevice.SetItemText(i, 7, text); //_______________________________________________ mxcd.dwControlID = mxc[control].dwControlID; mmr = ::mixerGetControlDetails((HMIXEROBJ)(UINT_PTR)mixerIndex, &mxcd, MIXER_GETCONTROLDETAILSF_VALUE); if (mmr == MMSYSERR_NOERROR) { _snwprintf_s(text, 64, _TRUNCATE, L"%u", mxcdVol.dwValue); lvDevice.SetItemText(i, 8, text); } } } } //MIXERCONTROLDETAILS mxcd; //MIXERCONTROLDETAILS_UNSIGNED mxcdVol; //mxcd.cChannels = 1; //mxcd.cMultipleItems = 0; //mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_UNSIGNED); //mxcd.paDetails = &mxcdVol; //mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS); //mxcd.dwControlID = controlID; //mxcdVol.dwValue = level; //MMRESULT mmr = ::mixerSetControlDetails((HMIXEROBJ)(UINT_PTR)mixerIndex, &mxcd, MIXER_SETCONTROLDETAILSF_VALUE); //if (mmr != MMSYSERR_NOERROR) return Mm::Assistant::GetErrorText(mmr); } |