public FlvClipProcessor(FlvMetadata header, List <FlvTag> head, List <FlvTag> past, uint future)
{
Header = header;
HTags = head;
Tags = past;
target = Tags[Tags.Count - 1].TimeStamp + (int)(future * FlvStreamProcessor.SEC_TO_MS);
logger.Debug("Clip 创建 Tags.Count={0} Tags[0].TimeStamp={1} Tags[Tags.Count-1].TimeStamp={2} Tags里秒数={3}",
Tags.Count, Tags[0].TimeStamp, Tags[Tags.Count - 1].TimeStamp, (Tags[Tags.Count - 1].TimeStamp - Tags[0].TimeStamp) / 1000d);
}
public static FlvMetadata Parse(byte[] data)
{
var m = new FlvMetadata
{
Meta = _Decode(data)
};
if (!m.Meta.ContainsKey("duration"))
{
m.Meta["duration"] = 0.0;
}
if (!m.Meta.ContainsKey("lasttimestamp"))
{
m.Meta["lasttimestamp"] = 0.0;
}
return(m);
}
private void _TagCreated(FlvTag tag)
{
if (Metadata == null)
{
if (tag.TagType == TagType.DATA)
{
_fs?.Write(FLV_HEADER_BYTES, 0, FLV_HEADER_BYTES.Length);
_fs?.Write(new byte[] { 0, 0, 0, 0, }, 0, 4);
Metadata = FlvMetadata.Parse(tag.Data);
// TODO: 添加录播姬标记、录制信息
tag.Data = Metadata.ToBytes();
tag.WriteTo(_fs);
}
else
{
throw new Exception("onMetaData not found");
}
}
else
{
if (!hasOffset)
{
if (tag.TagType == TagType.VIDEO)
{
TagVideoCount++;
if (TagVideoCount < 2)
{
logger.Trace("第一个 Video Tag 时间戳 {0} ms", tag.TimeStamp);
HTags.Add(tag);
}
else
{
BaseTimeStamp = tag.TimeStamp;
hasOffset = true;
logger.Trace("重设时间戳 {0} 毫秒", BaseTimeStamp);
}
}
else if (tag.TagType == TagType.AUDIO)
{
TagAudioCount++;
if (TagAudioCount < 2)
{
logger.Trace("第一个 Audio Tag 时间戳 {0} ms", tag.TimeStamp);
HTags.Add(tag);
}
else
{
BaseTimeStamp = tag.TimeStamp;
hasOffset = true;
logger.Trace("重设时间戳 {0} 毫秒", BaseTimeStamp);
}
}
}
if (hasOffset)
{
tag.TimeStamp -= BaseTimeStamp; // 修复时间戳
if (tag.TimeStamp < 0)
{
tag.TimeStamp = 0;
}
MaxTimeStamp = Math.Max(MaxTimeStamp, tag.TimeStamp);
}
else
{
tag.TimeStamp = 0;
}
// 如果没有禁用 Clip 功能
if (!_noClip)
{
Tags.Add(tag); // Clip 缓存
// 移除过旧的数据
if (MaxTimeStamp - LasttimeRemovedTimestamp > 800)
{
LasttimeRemovedTimestamp = MaxTimeStamp;
int max_remove_index = Tags.FindLastIndex(x => x.IsVideoKeyframe && ((MaxTimeStamp - x.TimeStamp) > (Clip_Past * SEC_TO_MS)));
if (max_remove_index > 0)
{
Tags.RemoveRange(0, max_remove_index);
}
// Tags.RemoveRange(0, max_remove_index + 1 - 1);
// 给将来的备注：这里是故意 + 1 - 1 的，因为要保留选中的那个关键帧， + 1 就把关键帧删除了
}
}
// 写入硬盘
tag.WriteTo(_fs);
TagProcessed?.Invoke(this, new TagProcessedArgs()
{
Tag = tag
});
} // if (Metadata == null) else
}