EasyPlayerPro windows播放器本地音频播放音量控制实现

背景描述

作为一个播放器, 除了能播放视频和声音外，音量控制是绝对不能缺少的功能; 本文在音视频播放的基础上，增加对音量的控制；

实现流程

• 调用mixerGetDevCaps获取音频输出设备列表;
• 打开指定的音频输出设备;
• 获取指定音频输出设备的音频属性;
• 获取和设置音量;

    DWORD GetVolume();
    int   SetVolume(DWORD vol);
    int   Init(DWORD ComponentType,int *min,int *max);

    int     GetAudioOutputDeviceList(MIXER_DEVICE_INFO_T    **devicelist, int *deviceNum);
    int     SetAudioDeviceId(int _deviceIdx);

代码实现

//获取音频输出设备列表
int CVolumeControl::GetAudioOutputDeviceList(MIXER_DEVICE_INFO_T    **devicelist, int *deviceNum)
{
int     idx = 0;
if (mDeviceNum < 1)
{
    MIXERCAPS           mxcaps;
    UINT cMixerDevs = mixerGetNumDevs();
    for (UINT iDevIndex = 0; iDevIndex < cMixerDevs && iDevIndex<MAX_MIXER_DEVICE_NUM; iDevIndex++)
    {
        mixerGetDevCaps(iDevIndex, &mxcaps, sizeof(mxcaps));

        mixerDeviceList[iDevIndex].id = iDevIndex;
        strcpy(mixerDeviceList[iDevIndex].name, mxcaps.szPname);
    }
    mDeviceNum = cMixerDevs;
}

if (NULL != deviceNum)      *deviceNum = mDeviceNum;
if (NULL != devicelist)     *devicelist = &mixerDeviceList[0];

return 0;
}

//获取音量
DWORD CVolumeControl::GetVolume()
{
int devIdx = mDeviceId;

if (devIdx < 0)     return -1;

HMIXER hMixer;
MMRESULT        mmhr;
mmhr = mixerOpen(&hMixer, devIdx, 0, 0, MIXER_OBJECTF_HMIXER|MIXER_GETLINEINFOF_DESTINATION);
if( mmhr != MMSYSERR_NOERROR )
{
    _TRACE(TRACE_LOG_ERROR, "GetVolume::mixerOpen fail. %d\n", mmhr);
    return 0;
}

MIXERCAPS   tmixercaps;
if( mixerGetDevCaps( devIdx, &tmixercaps, sizeof(MIXERCAPS)) != MMSYSERR_NOERROR )
{
    mixerClose(hMixer);
    return -1;
}

bool ffind = false;
MIXERLINE       mxline;
for(int i = 0; i < (int)tmixercaps.cDestinations; i++ )
{
    ZeroMemory( &mxline, sizeof(MIXERLINE) );
    mxline.cbStruct      = sizeof(MIXERLINE);
    mxline.dwDestination = i;

    mmhr = ::mixerGetLineInfo( (HMIXEROBJ)hMixer, &mxline, MIXER_OBJECTF_HMIXER);// | MIXER_GETLINEINFOF_COMPONENTTYPE );
    if( mmhr != MMSYSERR_NOERROR ) {
        continue;
    }
    else {
        if( mxline.dwComponentType == MIXERLINE_COMPONENTTYPE_DST_DIGITAL )
        {
            if( 0 != (MIXERLINE_LINEF_ACTIVE & mxline.fdwLine) )
            {

                ffind = true;
                break;

            }
        }
        else if( mxline.dwComponentType == MIXERLINE_COMPONENTTYPE_DST_MONITOR )
        {
            if( 0 != (MIXERLINE_LINEF_ACTIVE & mxline.fdwLine) )
            {

                ffind = true;
                break;

            }
        }
        else if( mxline.dwComponentType == MIXERLINE_COMPONENTTYPE_DST_SPEAKERS )
        {
            if( 0 != (MIXERLINE_LINEF_ACTIVE & mxline.fdwLine) )
            {

                ffind = true;
                break;

            }
        }
    }
}

MIXERCONTROL    mxcWaveoutMux;
memset(&mxcWaveoutMux, 0x00, sizeof(MIXERCONTROL));
    _GetLineControls( hMixer, mxline, &mxcWaveoutMux, NULL, NULL );

MIXERCONTROLDETAILS mxcd;
MIXERCONTROLDETAILS_UNSIGNED mxdu;
memset(&mxdu, 0x00, sizeof(MIXERCONTROLDETAILS_UNSIGNED));

mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
mxcd.cMultipleItems = 0;
mxcd.cChannels = mxline.cChannels;
mxcd.dwControlID = mxcWaveoutMux.dwControlID;
mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_UNSIGNED);
mxcd.paDetails = &mxdu;
mmhr = mixerGetControlDetails((HMIXEROBJ)hMixer, &mxcd, MIXER_OBJECTF_HMIXER | MIXER_GETCONTROLDETAILSF_VALUE);
if( mmhr != MMSYSERR_NOERROR )
{
    _TRACE(TRACE_LOG_ERROR, "GetVolume::mixerGetControlDetails fail. %d\n", mmhr);
}
mixerClose(hMixer);

_TRACE(TRACE_LOG_DEBUG, "GetVolume: %d\n", mxdu.dwValue);
return mxdu.dwValue;
}

//设置音量
int CVolumeControl::SetVolume(DWORD vol)
{
int devIdx = mDeviceId;
if (devIdx < 0)     return -1;

HMIXER hMixer;
MMRESULT        mmhr;
mmhr = mixerOpen(&hMixer, 0, 0, 0, 0);

if (mmhr!= MMSYSERR_NOERROR)
{
    _TRACE(TRACE_LOG_ERROR, "mixerOpen fail. %d\n", mmhr);
    return -1;
}

MIXERCAPS   tmixercaps;
if( mixerGetDevCaps( devIdx, &tmixercaps, sizeof(MIXERCAPS)) != MMSYSERR_NOERROR )
{
    mixerClose(hMixer);
    return -1;
}

bool ffind = false;
MIXERLINE       mxline;
for(int i = 0; i < (int)tmixercaps.cDestinations; i++ )
{
    ZeroMemory( &mxline, sizeof(MIXERLINE) );
    mxline.cbStruct      = sizeof(MIXERLINE);
    mxline.dwDestination = i;

    mmhr = ::mixerGetLineInfo( (HMIXEROBJ)hMixer, &mxline, MIXER_OBJECTF_HMIXER);// | MIXER_GETLINEINFOF_COMPONENTTYPE );
    if( mmhr != MMSYSERR_NOERROR ) {

        continue;
    }
    else {

        //
        if( mxline.dwComponentType == MIXERLINE_COMPONENTTYPE_DST_DIGITAL )
        {
            if( 0 != (MIXERLINE_LINEF_ACTIVE & mxline.fdwLine) )
            {

                ffind = true;
                break;

            }
        }
        else if( mxline.dwComponentType == MIXERLINE_COMPONENTTYPE_DST_MONITOR )
        {
            if( 0 != (MIXERLINE_LINEF_ACTIVE & mxline.fdwLine) )
            {

                ffind = true;
                break;

            }
        }
        else if( mxline.dwComponentType == MIXERLINE_COMPONENTTYPE_DST_SPEAKERS )
        {
            if( 0 != (MIXERLINE_LINEF_ACTIVE & mxline.fdwLine) )
            {

                ffind = true;
                break;

            }
        }
    }
}

MIXERCONTROL    mxcWaveoutMux;
memset(&mxcWaveoutMux, 0x00, sizeof(MIXERCONTROL));
    _GetLineControls( hMixer, mxline, &mxcWaveoutMux, NULL, NULL );

int ret = 0;

MIXERCONTROLDETAILS mxcd;
MIXERCONTROLDETAILS_UNSIGNED mxdu;
memset(&mxdu, 0x00, sizeof(MIXERCONTROLDETAILS_UNSIGNED));

mxdu.dwValue = vol;
mxcd.cMultipleItems = 0;
mxcd.cChannels = mxline.cChannels;
mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS);
mxcd.dwControlID = mxcWaveoutMux.dwControlID;
mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_UNSIGNED);
mxcd.paDetails = &mxdu;

mmhr = mixerSetControlDetails((HMIXEROBJ)hMixer, &mxcd, MIXER_SETCONTROLDETAILSF_VALUE | MIXER_OBJECTF_HMIXER);
if (mmhr != MMSYSERR_NOERROR)
{
    ret = -1;
}

mixerClose(hMixer);

return ret;
}

关于EasyPlayerPro播放器

EasyPlayerPro是一款全功能的流媒体播放器，支持RTSP、RTMP、HTTP、HLS、UDP、RTP、File等多种流媒体协议播放、支持本地文件播放，支持本地抓拍、本地录像、播放旋转、多屏播放、倍数播放等多种功能特性，核心基于ffmpeg，稳定、高效、可靠、可控，支持Windows、Android、iOS三个平台，目前在多家教育、安防、行业型公司，都得到的应用，广受好评！

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