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我在修改 Chromium 的代码，在修改到下面这段的时候，发现代码存在问题，出现问题的地方是在(has_poster_xxx)这里，但我暂时没想到解决的办法，请问大家知道怎样修改这里的代码吗？

auto start_type = media::Pipeline::StartType::kNormal;
if ((GetDemuxerType() != media::DemuxerType::kChunkDemuxer) &&
preload_ == media::DataSource::METADATA &&
!client_->CouldPlayIfEnoughData() && !IsStreaming()) {
start_type =
(has_poster_
? media::Pipeline::StartType::kSuspendAfterMetadata
: media::Pipeline::StartType::kSuspendAfterMetadataForAudioOnly);
attempting_suspended_start_ = true;
}

2 replies • 2022-11-24 20:15:58 +08:00

brucedone

Nov 24, 2022

出的啥问题呢？没太懂你想改啥，比如期望的输入和输出是什么

yfqh

Nov 24, 2022

@brucedone 下面是初始的代码段

auto start_type = media::Pipeline::StartType::kNormal;
if ((GetDemuxerType() != media::DemuxerType::kChunkDemuxer) &&
preload_ == media::DataSource::METADATA &&
!client_->CouldPlayIfEnoughData() && !IsStreaming()) {
start_type =
(has_poster_ ||
base::FeatureList::IsEnabled(media::kPreloadMetadataLazyLoad))
? media::Pipeline::StartType::kSuspendAfterMetadata
: media::Pipeline::StartType::kSuspendAfterMetadataForAudioOnly;
attempting_suspended_start_ = true;
}

这是我修改后的

auto start_type = media::Pipeline::StartType::kNormal;
if ((GetDemuxerType() != media::DemuxerType::kChunkDemuxer) &&
preload_ == media::DataSource::METADATA &&
!client_->CouldPlayIfEnoughData() && !IsStreaming()) {
start_type =
(has_poster_
? media::Pipeline::StartType::kSuspendAfterMetadata
: media::Pipeline::StartType::kSuspendAfterMetadataForAudioOnly);
attempting_suspended_start_ = true;
}

我现在要将 base::FeatureList::IsEnabled(media::kPreloadMetadataLazyLoad)删去，但删去后好像发现会存在其他问题，这是 Chromium 工程师给的回复，我暂时还没有其他的修改思路。

The original code was: start_type = (has_poster_ || true) ? kSuspendAfterMetadata : kSuspendAfterMetadataForAudioOnly;

Patchset 9 changed it to: start_type = (has_poster_) ? kSuspendAfterMetadata : kSuspendAfterMetadataForAudioOnly;

Patchset 11 changed it to: start_type = (has_poster_ ? kSuspendAfterMetadata : kSuspendAfterMetadataForAudioOnly);

Shouldn't the code be: start_type = kSuspendAfterMetadata; ?

There may be some additional cleanup of kSuspendAfterMetadataForAudioOnly.