librtmp 源码分析笔记 WriteN

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于 2018-04-02 09:18:03 发布

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分类专栏： media stream 文章标签： librtmp

本文链接：https://blog.youkuaiyun.com/lucyTheSlayer/article/details/79784434

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本文记录了librtmp库中WriteN函数的简单实现，通过源码分析帮助理解其工作原理，方便日后查阅。

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WriteN实现很简单。贴下源码方便以后翻看。

static int
WriteN(RTMP *r, const char *buffer, int n)
{
  const char *ptr = buffer;
#ifdef CRYPTO
  char *encrypted = 0;
  char buf[RTMP_BUFFER_CACHE_SIZE];

  if (r->Link.rc4keyOut)
    {
      if (n > sizeof(buf))
	encrypted = (char *)malloc(n);
      else
	encrypted = (char *)buf;
      ptr = encrypted;
      RC4_encrypt2(r->Link.rc4keyOut, n, buffer, ptr);
    }
#endif

  while (n > 0)
    {
      int nBytes;

      if (r->Link.protocol & RTMP_FEATURE_HTTP)
        nBytes = HTTP_Post(r, RTMPT_SEND, ptr, n);
      else
        nBytes = RTMPSockBuf_Send(&r->m_sb, ptr, n);
      /*RTMP_Log(RTMP_LOGDEBUG, "%s: %d\n", __FUNCTION__, nBytes); */

      if (nBytes < 0)
	{
	  int sockerr = GetSockError();
	  RTMP_Log(RTMP_LOGERROR, "%s, RTMP send error %d (%d bytes)", __FUNCTION__,
	      sockerr, n);

	  if (sockerr == EINTR && !RTMP_c

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