涤心斋

淡泊以明志，宁静以致远！

日志

关于我

大龙猫

努力学习,天天向上。

文章分类

DirectShow的音量控制

2008-08-19 17:52:44| 分类： DirectShow | 标签： |举报 |字号大中小订阅

下载LOFTER 我的照片书 |

　　本来这个问题没有任何悬念，但是，事实上并不是简单调用一下IBasicAudio.put_Volume就成了。我的实现代码如下，已在调试中通过，多谢VC+DirectShow+AVS的“上海--阿易”兄的帮助。
        private int[] volumes = new int[]{-10000,-6418,-6147,-6000,
        -5892,-4826,-4647,-4540
        -4477, -4162,-3876, -3614, -3500,
        -3492,-3374,-3261,-3100,-3153,-3048,-2947,-2849,-2755,-2700,
        -2663,-2575,-2520,-2489,-2406,-2325,-2280,-2246,-2170,-2095,-2050,
        -2023,-1952,-1900, -1884,-1834, -1820, -1800,-1780, -1757,-1695,-1636,-1579,
        -1521,-1500,-1464,-1436,-1420, -1408,-1353,-1299,-1246,-1195,-1144,
        -1096,-1060, -1049,-1020,-1003,-957,-912,-868, -800, -774,-784, -760, -744,
        -705,-667,-630,-610,-594,-570 ,-558,-525,-493,-462,-432,-403,
        -375,-348,-322,-297,-285, -273,-250,-228,-207,-187,-176, -168,
        -150,-102,-75,-19,-10,0,0};

　　 /// <summary>
        /// 获得、设置音量
        /// </summary>
        public int Volume
        {
            get
            {
                if (basicAudio == null) return 0;
                int hr = 0, volume = 0;
                hr = basicAudio.get_Volume(out volume);
                DsError.ThrowExceptionForHR(hr);
                foreach (int v in volumes)
                    if (v >= volume) { volume = v; break; }
                return volume;
            }
            set
            {
                if (basicAudio == null) return;
                if (value < 0) value = 0;
                if (value >= 100) value = 99;
                int hr = 0;
                hr = basicAudio.put_Volume(volumes[value]);
                DsError.ThrowExceptionForHR(hr);
            }
        }
　　本来，directshow中的音量范围是在-10000至0之间，但是我发现，0总是代表当前已有的音量，也就是说播放器只能在已有音量上减小，而不能有所增加。这是个很让人头痛的问题。阿易兄的vc版实现启发了我。

评论这张

转发至微博

阅读(3029)| 评论(1)

历史上的今天

this.p={  m:2,
              b:2,
              loftPermalink:'',
              id:'fks_085067082087084065086081080095085083086064093083085065',
              blogTitle:'DirectShow的音量控制',
              blogAbstract:'　　本来这个问题没有任何悬念，但是，事实上并不是简单调用一下IBasicAudio.put_Volume就成了。我的实现代码如下，已在调试中通过，多谢VC+DirectShow+AVS的“上海--阿易”兄的帮助。<br\>        private int[] volumes = new int[]{-10000,-6418,-6147,-6000,<br\>        -5892,-4826,-4647,-4540<br\>        -4477, -4162,-3876, -3614, -3500,<br\>        -3492,',
              blogTag:'',
              blogUrl:'blog/static/15739532200871955244339',
              isPublished:1,
              istop:false,
              type:0,
              modifyTime:0,
              publishTime:1219139564339,
              permalink:'blog/static/15739532200871955244339',
              commentCount:1,
              mainCommentCount:1,
              recommendCount:0,
              bsrk:-100,
              publisherId:0,
              recomBlogHome:false,
              currentRecomBlog:false,
              attachmentsFileIds:[],
              vote:{},
              groupInfo:{},
              friendstatus:'none',
              followstatus:'unFollow',
              pubSucc:'',
              visitorProvince:'',
              visitorCity:'',
              visitorNewUser:false,
              postAddInfo:{},
              mset:'000',
              mcon:'',
              srk:-100,
              remindgoodnightblog:false,
              isBlackVisitor:false,
              isShowYodaoAd:false,
              hostIntro:'努力学习,天天向上。',
              hmcon:'1',
              selfRecomBlogCount:'0',
              lofter_single:'<iframe width="140" height="560" style="overflow:hidden;" src="http://www.lofter.com/mailEntry.do?blogad=1&blog" frameBorder="0"></iframe>'
            }

{list a as x}
    {if !!x}
    <div class="iblock nbw-fce nbw-f40">
      <a class="fc03 noul" target="_blank" hidefocus="true" href="http://blog.163.com/${x.visitorName}/">
      {if x.visitorName==visitor.userName}
      <img alt="${x.visitorNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.visitorName)}&r=${visitor.imageUpdateTime}"/>
      {else}
      <img alt="${x.visitorNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.visitorName)}"/>
      {/if}
      </a>
      <div class="cwd vname thide">
        {if x.moveFrom=='wap'}
          <a class="noul pnt" target="_blank" href="http://blog.163.com/services/wapblog.html?frompersonalbloghome"><span title="来自网易手机博客" class="iblock wapIcon"> </span></a>
        {elseif x.moveFrom=='iphone'}
          <a class="noul pnt" target="_blank"><span title="来自iPhone客户端" class="iblock iphoneIcon"> </span></a>
        {elseif x.moveFrom=='android'}
          <a class="noul pnt" target="_blank"><span title="来自Android客户端" class="iblock androidIcon"> </span></a>
        {elseif x.moveFrom=='mobile'}
          <a class="noul pnt" target="_blank" href="http://blog.163.com/services/emsblog.html?frompersonalbloghome"><span title="来自网易短信写博" class="iblock wapIcon"> </span></a>
        {/if}
        <a class="fc03 m2a"  target="_blank" hidefocus="true" href="http://blog.163.com/${x.visitorName}/">
          ${fn(x.visitorNickname,8)|escape}
        </a>
      </div>
    </div>
    {/if}
    {/list}

<#--最新日志，群博日志--> <#--推荐日志-->

<p class="fc06">推荐过这篇日志的人：</p>
    <div>
      {list a as x}
      {if !!x}
      <div class="iblock nbw-fce nbw-f40">
        <a class="fc03 noul" target="_blank" hidefocus="true" href="http://blog.163.com/${x.recommenderName}/">
        <img alt="${x.recommenderNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.recommenderName)}"/>
        </a>
        <div class="cwd thide">
          <a class="fc03 m2a" target="_blank" hidefocus="true" href="http://blog.163.com/${x.recommenderName}/">
            ${fn(x.recommenderNickname,6)|escape}
          </a>
        </div>
      </div>
      {/if}
      {/list}
    </div>
    {if !!b&&b.length>0}
    <p  class="fc06">他们还推荐了：</p>
    <ul>
    {list b as y}
      {if !!y}
        <li class="rrb"><span class="iblock">·</span><a class="fc03 m2a" target="_blank" href="http://blog.163.com/${y.recommendBlogPermalink}/?from=blog/static/15739532200871955244339">${y.recommendBlogTitle|escape}</a></li>
      {/if}
    {/list}
    </ul>
    {/if}

<#--引用记录--> <#--博主推荐--> <#--随机阅读--> <#--首页推荐--> <#--历史上的今天--> <#--被推荐日志--> <#--上一篇，下一篇--> <#-- 热度 -->

{list a as x}
    {if !!x}
    <div class="hotItem iblock nbw-fce nbw-f40">
      <a class="fc03 noul" target="_blank" hidefocus="true" href="http://blog.163.com/${x.publisherUsername}/">
      {if x.publisherUsername==visitor.userName}
      <img alt="${x.publisherNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.publisherUsername)}&r=${visitor.imageUpdateTime}"/>
      {else}
      <img alt="${x.publisherNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.publisherUsername)}"/>
      {/if}
      </a>
      <div class="cwd vname thide">
        <a class="fc03 m2a"  target="_blank" hidefocus="true" href="http://blog.163.com/${x.publisherUsername}/">
          ${fn(x.publisherNickname,8)|escape}
        </a>
      </div>
      <a class="f-myLikeIcons hottype {if x.type==1} js-liketype{elseif x.type==2} js-reblogtype{elseif x.type==3} js-sharetype{else}{/if}" target="_blank" hidefocus="true" href="http://blog.163.com/${x.publisherUsername}/"> </a>
    </div>
    {/if}
    {/list}

<#-- 网易新闻广告 --> <#--右边模块结构--> <#--评论模块结构--> <#--引用模块结构--> <#--博主发起的投票-->

页脚

我的照片书 - 手机博客 - 下载LOFTER APP - 订阅此博客

涤心斋

导航

日志

DirectShow的音量控制

历史上的今天

最近读者

热度

评论

页脚