EasyPlayerPro windows播放器之多窗口播放音量控制方法
EasyPlayerPro-win基础版本的音频播放为单一通道播放,即同一时间仅允许一个通道播放声音,现应客户需求,在基础版本上实现独立的音频播放,即每个通道可同时播放视频和音频;
设计思路
将音频播放类DirectSoundPlayer移到每个播放通道中, 取消之前的音频通道关系判断; 音量控制类保持不变;
DirectSoundPlayer 实现
- 打开音频播放设备 Open(WAVEFORMATEX *pWaveFormatEx);
- 调用开始播放;
- 将音频数据写入队列;
- 播放线程从队列中读取数据开始播放;
- 调用停止播放;
- 关闭音频播放设备;
注: 在没有声音数据时,需填充为静音数据. 否则会一直播放最后一帧的音频;
播放数据填充代码如下:
while (1)
{
if (pDirectSoundObj->flag == 0x03) break;
if ( (res >= WAIT_OBJECT_0) && (res < WAIT_OBJECT_0+DIRECT_SOUND_BUFFER_NUM) )
{
pDirectSoundObj->audioFrameNum = BUFQUE_GetFrameNum(pDirectSoundObj->buffQueue, consumerHandle, BUFFER_TYPE_AUDIO);
unsigned char *pbuf = NULL, *pbuf2=NULL;
DWORD buflen = 0, buflen2=0;
HRESULT hr = pDirectSoundObj->pDirectSoundBuffer8->Lock(offset, pDirectSoundObj->packetSize, (LPVOID*)&pbuf, &buflen, (LPVOID*)&pbuf2, &buflen2, 0);
if (DSERR_BUFFERLOST == hr)
{
pDirectSoundObj->pDirectSoundBuffer8->Restore();
hr = pDirectSoundObj->pDirectSoundBuffer8->Lock(offset, pDirectSoundObj->packetSize, (LPVOID*)&pbuf, &buflen, (LPVOID*)&pbuf2, &buflen2, 0);
}
if (buflen > 0)
{
int ret = BUFQUE_GetData(pDirectSoundObj->buffQueue, consumerHandle, NULL, &bufferType, NULL, NULL, &sourceBuff.bufpos, sourceBuff.pbuf, 0x01);
if ( (ret == 0x00) && (buflen == sourceBuff.bufpos) )
{
memcpy(pbuf, sourceBuff.pbuf, sourceBuff.bufpos);
if (buflen2 > 0)
{
ret = BUFQUE_GetData(pDirectSoundObj->buffQueue, consumerHandle, NULL, &bufferType, NULL, NULL, &sourceBuff.bufpos, sourceBuff.pbuf, 0x01);
if (ret == 0x00 && buflen2 == sourceBuff.bufpos)
{
memcpy(pbuf2, sourceBuff.pbuf, sourceBuff.bufpos);
}
}
}
else
{
memset(pbuf, 0x00, buflen); //填充为静音
}
pDirectSoundObj->pDirectSoundBuffer8->Unlock(pbuf, buflen, pbuf2, buflen2);
}
offset += (buflen+buflen2);
if (offset >= pDirectSoundObj->directSoundBufferDesc.dwBufferBytes) offset = 0;
}
....
}
关于EasyPlayerPro
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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