RTMPdump（libRTMP） 源代码分析 9： 接收消息（Message）（接收视音频数据）(四)
packetBody + pos + 11,
r->m_read.
nInitialFrameSize) != 0)
{
RTMP_Log(RTMP_LOGERROR,
"FLV Stream: Keyframe doesn't match!");
ret = RTMP_READ_ERROR;
break;
}
r->m_read.flags |= RTMP_READ_GOTFLVK;
/* skip this packet
* check whether skippable:
*/
if (pos + 11 + dataSize + 4 > nPacketLen)
{
RTMP_Log(RTMP_LOGWARNING,
"Non skipable packet since it doesn't end with chunk, stream corrupt!");
ret = RTMP_READ_ERROR;
break;
}
packetBody += (pos + 11 + dataSize + 4);
nPacketLen -= (pos + 11 + dataSize + 4);
goto stopKeyframeSearch;
}
else if (r->m_read.nResumeTS < ts)
{
/* the timestamp ts will only increase with
* further packets, wait for seek
*/
goto stopKeyframeSearch;
}
}
pos += (11 + dataSize + 4);
}
if (ts < r->m_read.nResumeTS)
{
RTMP_Log(RTMP_LOGERROR,
"First packet does not contain keyframe, all "
"timestamps are smaller than the keyframe "
"timestamp; probably the resume seek failed ");
}
stopKeyframeSearch:
;
if (!(r->m_read.flags & RTMP_READ_GOTFLVK))
{
RTMP_Log(RTMP_LOGERROR,
"Couldn't find the seeked keyframe in this chunk!");
ret = RTMP_READ_IGNORE;
break;
}
}
}
}
if (packet.m_nTimeStamp > 0
&& (r->m_read.flags & (RTMP_READ_GOTKF|RTMP_READ_GOTFLVK)))
{
/* another problem is that the server can actually change from
* 09/08 video/audio packets to an FLV stream or vice versa and
* our keyframe check will prevent us from going along with the
* new stream if we resumed.
*
* in this case set the 'found keyframe' variables to true.
* We assume that if we found one keyframe somewhere and were
* already beyond TS > 0 we have written data to the output
* which means we can accept all forthcoming data including the
* change between 08/09 <-> FLV packets
*/
r->m_read.flags |= (RTMP_READ_GOTKF|RTMP_READ_GOTFLVK);
}
/* skip till we find our keyframe
* (seeking might put us somewhere before it)
*/
if (!(r->m_read.flags & RTMP_READ_GOTKF) &&
packet.m_packetType != 0x16)
{
RTMP_Log(RTMP_LOGWARNING,
"Stream does not start with requested frame, ignoring data... ");
r->m_read.nIgnoredFrameCounter++;
if (r->m_read.nIgnoredFrameCounter > MAX_IGNORED_FRAMES)
ret = RTMP_READ_ERROR; /* fatal error, couldn't continue stream */
else
ret = RTMP_READ_IGNORE;
break;
}
/* ok, do the same for FLV streams */
if (!(r->m_read.flags & RTMP_READ_GOTFLVK) &&
packet.m_packetType == 0x16)
{
RTMP_Log(RTMP_LOGWARNING,
"Stream does not start with r