Vérifiez si le volume du système est coupé.

Question

Je travaille sur un projet qui joue de l'audio pour une partie du programme. Je voudrais être en mesure d'afficher un message si le volume du système de l'utilisateur est coupé. J'utilise Python sur Windows.

Answer 1

Utilisez l'API Windows Mixer. J'ai trouvé cet article pour vous, et attaché le code pertinent: (De MS KB 181550: "Surveiller les niveaux de volume audio")

Ceci est en C, mais il peut également être "traduit" en Python.

J'espère que cela aide.

#include <windows.h> 
#include <mmsystem.h> 

MMRESULT rc;    // Return code. 
HMIXER hMixer;   // Mixer handle used in mixer API calls. 
MIXERCONTROL mxc;   // Holds the mixer control data. 
MIXERLINE mxl;   // Holds the mixer line data. 
MIXERLINECONTROLS mxlc; // Obtains the mixer control. 

// Open the mixer. This opens the mixer with a deviceID of 0. If you 
// have a single sound card/mixer, then this will open it. If you have 
// multiple sound cards/mixers, the deviceIDs will be 0, 1, 2, and 
// so on. 
rc = mixerOpen(&hMixer, 0,0,0,0); 
if (MMSYSERR_NOERROR != rc) { 
    // Couldn't open the mixer. 
} 

// Initialize MIXERLINE structure. 
ZeroMemory(&mxl,sizeof(mxl)); 
mxl.cbStruct = sizeof(mxl); 

// Specify the line you want to get. You are getting the input line 
// here. If you want to get the output line, you need to use 
// MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT. 
mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_WAVEIN; 

rc = mixerGetLineInfo((HMIXEROBJ)hMixer, &mxl, 
         MIXER_GETLINEINFOF_COMPONENTTYPE); 
if (MMSYSERR_NOERROR == rc) { 
    // Couldn't get the mixer line. 
} 

// Get the control. 
ZeroMemory(&mxlc, sizeof(mxlc)); 
mxlc.cbStruct = sizeof(mxlc); 
mxlc.dwLineID = mxl.dwLineID; 
mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_PEAKMETER; 
mxlc.cControls = 1; 
mxlc.cbmxctrl = sizeof(mxc); 
mxlc.pamxctrl = &mxc; 
ZeroMemory(&mxc, sizeof(mxc)); 
mxc.cbStruct = sizeof(mxc); 
rc = mixerGetLineControls((HMIXEROBJ)hMixer,&mxlc, 
          MIXER_GETLINECONTROLSF_ONEBYTYPE); 
if (MMSYSERR_NOERROR != rc) { 
    // Couldn't get the control. 
} 

// After successfully getting the peakmeter control, the volume range 
// will be specified by mxc.Bounds.lMinimum to mxc.Bounds.lMaximum. 

MIXERCONTROLDETAILS mxcd;    // Gets the control values. 
MIXERCONTROLDETAILS_SIGNED volStruct; // Gets the control values. 
long volume;       // Holds the final volume value. 

// Initialize the MIXERCONTROLDETAILS structure 
ZeroMemory(&mxcd, sizeof(mxcd)); 
mxcd.cbStruct = sizeof(mxcd); 
mxcd.cbDetails = sizeof(volStruct); 
mxcd.dwControlID = mxc.dwControlID; 
mxcd.paDetails = &volStruct; 
mxcd.cChannels = 1; 

// Get the current value of the peakmeter control. Typically, you 
// would set a timer in your program to query the volume every 10th 
// of a second or so. 
rc = mixerGetControlDetails((HMIXEROBJ)hMixer, &mxcd, 
          MIXER_GETCONTROLDETAILSF_VALUE); 
if (MMSYSERR_NOERROR == rc) { 
    // Couldn't get the current volume. 
} 
volume = volStruct.lValue; 

// Get the absolute value of the volume. 
if (volume < 0) 
    volume = -volume;