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优化rtmp发送，减少内存拷贝以及开辟

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This commit is contained in:
xiongziliang 2019-03-23 22:00:16 +08:00
parent ce3c4c0d69
commit dc1cae2153
1 changed files with 38 additions and 24 deletions
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62
src/Rtmp/RtmpProtocol.cpp
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@ -221,41 +221,55 @@ void RtmpProtocol::sendRtmp(uint8_t ui8Type, uint32_t ui32StreamId,
auto strErr = StrPrinter << "不支持发送该类型的块流 ID:" << iChunkId << endl;
throw std::runtime_error(strErr);
}
//是否有扩展时间戳
bool bExtStamp = ui32TimeStamp >= 0xFFFFFF;
RtmpHeader header;
header.flags = (iChunkId & 0x3f) | (0 << 6);
header.typeId = ui8Type;
set_be24(header.timeStamp, bExtStamp ? 0xFFFFFF : ui32TimeStamp);
set_be24(header.bodySize, buf->size());
set_le32(header.streamId, ui32StreamId);
//估算rtmp包数据大小
uint32_t totalSize = 0;
onSendRawData(obtainBuffer((char *) &header, sizeof(header)));
totalSize += sizeof(header);
//rtmp头
BufferRaw::Ptr bufferHeader = obtainBuffer();
bufferHeader->setCapacity(sizeof(RtmpHeader));
bufferHeader->setSize(sizeof(RtmpHeader));
//对rtmp头赋值，如果使用整形赋值，在arm android上可能由于数据对齐导致总线错误的问题
RtmpHeader *header = (RtmpHeader*) bufferHeader->data();
header->flags = (iChunkId & 0x3f) | (0 << 6);
header->typeId = ui8Type;
set_be24(header->timeStamp, bExtStamp ? 0xFFFFFF : ui32TimeStamp);
set_be24(header->bodySize, buf->size());
set_le32(header->streamId, ui32StreamId);
//发送rtmp头
onSendRawData(bufferHeader);
char acExtStamp[4];
//扩展时间戳字段
BufferRaw::Ptr bufferExtStamp;
if (bExtStamp) {
//扩展时间戳
set_be32(acExtStamp, ui32TimeStamp);
}
size_t pos = 0;
while (pos < buf->size()) {
if (pos) {
uint8_t flags = (iChunkId & 0x3f) | (3 << 6);
onSendRawData(obtainBuffer((char *) &flags, 1));
//生成扩展时间戳
bufferExtStamp = obtainBuffer();
bufferExtStamp->setCapacity(4);
bufferExtStamp->setSize(4);
set_be32(bufferExtStamp->data(), ui32TimeStamp);
}
//生成一个字节的flag，标明是什么chunkId
BufferRaw::Ptr bufferFlags = obtainBuffer();
bufferFlags->setCapacity(1);
bufferFlags->setSize(1);
bufferFlags->data()[0] = (iChunkId & 0x3f) | (3 << 6);
size_t offset = 0;
uint32_t totalSize = sizeof(RtmpHeader);
while (offset < buf->size()) {
if (offset) {
onSendRawData(bufferFlags);
totalSize += 1;
}
if (bExtStamp) {
//扩展时间戳
onSendRawData(obtainBuffer(acExtStamp, 4));
onSendRawData(bufferExtStamp);
totalSize += 4;
}
size_t chunk = min(_iChunkLenOut, buf->size() - pos);
onSendRawData(std::make_shared<BufferPartial>(buf,pos,chunk));
size_t chunk = min(_iChunkLenOut, buf->size() - offset);
onSendRawData(std::make_shared<BufferPartial>(buf,offset,chunk));
totalSize += chunk;
pos += chunk;
offset += chunk;
}
_ui32ByteSent += totalSize;
if (_ui32WinSize > 0 && _ui32ByteSent - _ui32LastSent >= _ui32WinSize) {