?多線程處理：https://blog.csdn.net/strikedragon/article/details/82776001

bool allowPools = !p->numaPools || strcmp(p->numaPools, "none");

? ? // Trim the thread pool if --wpp, --pme, and --pmode are disabled
? ? if (!p->bEnableWavefront && !p->bDistributeModeAnalysis && !p->bDistributeMotionEstimation && !p->lookaheadSlices)
? ? ? ? allowPools = false;

bDistributeModeAnalysis ：評(píng)估使用多線程CU mode的花費(fèi)

bDistributeMotionEstimation：使用多線程Motion estimation的花費(fèi)

lookaheadSlices：使用多線程計(jì)算每一幀的花費(fèi)

? ? m_numPools = 0;
? ? if (allowPools)
? ? ? ? m_threadPool = ThreadPool::allocThreadPools(p, m_numPools, 0);
? ? else
? ? {
? ? ? ? if (!p->frameNumThreads)
? ? ? ? {
? ? ? ? ? ? // auto-detect frame threads
? ? ? ? ? ? int cpuCount = ThreadPool::getCpuCount();
? ? ? ? ? ? ThreadPool::getFrameThreadsCount(p, cpuCount);
? ? ? ? }
? ? }

并發(fā)編碼幀的數(shù)量

? ? if (!m_numPools)
? ? {
? ? ? ? // issue warnings if any of these features were requested
? ? ? ? if (p->bEnableWavefront)
? ? ? ? ? ? x265_log(p, X265_LOG_WARNING, "No thread pool allocated, --wpp disabled\n");
? ? ? ? if (p->bDistributeMotionEstimation)
? ? ? ? ? ? x265_log(p, X265_LOG_WARNING, "No thread pool allocated, --pme disabled\n");
? ? ? ? if (p->bDistributeModeAnalysis)
? ? ? ? ? ? x265_log(p, X265_LOG_WARNING, "No thread pool allocated, --pmode disabled\n");
? ? ? ? if (p->lookaheadSlices)
? ? ? ? ? ? x265_log(p, X265_LOG_WARNING, "No thread pool allocated, --lookahead-slices disabled\n");

? ? ? ? // disable all pool features if the thread pool is disabled or unusable.
? ? ? ? p->bEnableWavefront = p->bDistributeModeAnalysis = p->bDistributeMotionEstimation = p->lookaheadSlices = 0;
? ? }

對(duì)于每一個(gè)frame的線程，創(chuàng)建frameEncoder

?for (int i = 0; i < m_param->frameNumThreads; i++)
? ? {
? ? ? ? m_frameEncoder[i] = new FrameEncoder;
? ? ? ? m_frameEncoder[i]->m_nalList.m_annexB = !!m_param->bAnnexB;
? ? }

?

if (m_numPools)
? ? {
? ? ? ? for (int i = 0; i < m_param->frameNumThreads; i++)
? ? ? ? {
? ? ? ? ? ? int pool = i % m_numPools;
? ? ? ? ? ? m_frameEncoder[i]->m_pool = &m_threadPool[pool];
? ? ? ? ? ? m_frameEncoder[i]->m_jpId = m_threadPool[pool].m_numProviders++;
? ? ? ? ? ? m_threadPool[pool].m_jpTable[m_frameEncoder[i]->m_jpId] = m_frameEncoder[i];

把每個(gè)frameEncoder分配到對(duì)應(yīng)的pool中，JobProvider是Frame level job providers. FrameEncoder and Lookahead derive from this class and implement findJob()

? ? ? ? }
? ? ? ? for (int i = 0; i < m_numPools; i++)
? ? ? ? ? ? m_threadPool[i].start();
? ? }
? ? else
? ? {
? ? ? ? /* CU stats and noise-reduction buffers are indexed by jpId, so it cannot be left as -1 */
? ? ? ? for (int i = 0; i < m_param->frameNumThreads; i++)
? ? ? ? ? ? m_frameEncoder[i]->m_jpId = 0;
? ? }

創(chuàng)建或者解析ScalingList

if (!m_scalingList.init())
? ? {
? ? ? ? x265_log(m_param, X265_LOG_ERROR, "Unable to allocate scaling list arrays\n");
? ? ? ? m_aborted = true;
? ? ? ? return;
? ? }
? ? else if (!m_param->scalingLists || !strcmp(m_param->scalingLists, "off"))
? ? ? ? m_scalingList.m_bEnabled = false;
? ? else if (!strcmp(m_param->scalingLists, "default"))
? ? ? ? m_scalingList.setDefaultScalingList();
? ? else if (m_scalingList.parseScalingList(m_param->scalingLists))
? ? ? ? m_aborted = true;

根據(jù)Pool來計(jì)算lookahead的線程，Lookahead

int pools = m_numPools;
? ? ThreadPool* lookAheadThreadPool = 0;
? ? if (m_param->lookaheadThreads > 0)
? ? {
? ? ? ? lookAheadThreadPool = ThreadPool::allocThreadPools(p, pools, 1);
? ? }
? ? else
? ? ? ? lookAheadThreadPool = m_threadPool;
? ? m_lookahead = new Lookahead(m_param, lookAheadThreadPool);
? ? if (pools)
? ? {
? ? ? ? m_lookahead->m_jpId = lookAheadThreadPool[0].m_numProviders++;
? ? ? ? lookAheadThreadPool[0].m_jpTable[m_lookahead->m_jpId] = m_lookahead;
? ? }
? ? if (m_param->lookaheadThreads > 0)
? ? ? ? for (int i = 0; i < pools; i++)
? ? ? ? ? ? lookAheadThreadPool[i].start();

創(chuàng)建DPB和RateControl類

? ? m_dpb = new DPB(m_param);
? ? m_rateControl = new RateControl(*m_param);

初始化VPS，SPS和PPS

initVPS(&m_vps);
? ? initSPS(&m_sps);
? ? initPPS(&m_pps);

?

?

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