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RTC: Support high performance NO-COPY-NACK. 4.0.76
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@winlinvip
winlinvip committed Feb 28, 2021
1 parent c20d8fb commit 36ea673
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1 change: 1 addition & 0 deletions README.md
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## V4 changes

* v4.0, 2021-02-28, RTC: Support high performance NO-COPY-NACK. 4.0.76
* v4.0, 2021-02-27, RTC: Support object cache pool. 4.0.75
* v4.0, 2021-02-12, RTC: Support high performance timer about 25ms resolution. 4.0.72
* v4.0, 2021-02-10, RTC: Refine performance about 700+ streams. 4.0.71
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2 changes: 1 addition & 1 deletion trunk/src/core/srs_core_version4.hpp
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#ifndef SRS_CORE_VERSION4_HPP
#define SRS_CORE_VERSION4_HPP

#define SRS_VERSION4_REVISION 75
#define SRS_VERSION4_REVISION 76

#endif

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@winlinvip winlinvip commented on 36ea673 Feb 28, 2021 •
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零拷贝，就是不拷贝，直接使用RTP packet。这样系统没有额外拷贝的RTP Packet。包的流程如下：

  1. Publisher，收到UDP包，创建RTP Packet，从UDP包中解析出RTP Packet。
  2. 这个包拷贝给Player，每个Player都有自己的一个RTP Packet，需要修改PT和SSRC等。注意payload是shared message，引用计数不拷贝。
  3. Publisher NACK直接将解析出来的RTP Packet放到NACK队列，避免额外的拷贝。
  4. Player NACK直接将自己的RTP Packet放到NACK队列，避免额外的拷贝。

目前是（具体以代码为准）默认禁用，开启nack.no_copy的方法如下：

vhost __defaultVhost__ {
    rtc {
        enabled on;
    }
    nack {
        enabled on;
        no_copy on;
    }
}

相关Commit如下：

  • 支持禁用零拷贝NACK，默认禁用：c20d8fb
  • Player零拷贝NACK：af0b50f
  • Publisher零拷贝NACK：8382f57

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