private MetaArray ReadStrictArray(BinaryReader br)
{
var len = br.ReadBytes(4).ToUInt32(false);
offset += 4;
var array = new MetaArray();
for (uint i = 0; i < len; i++)
{
array.Add(ReadElement(br));
}
return array;
}
private MetaObject GetSegments(MetaArray filepositions, MetaArray times)
{
var timeLine = 0d;
var segments = new MetaObject();
segments["extension"] = ".dat";
var positions = new MetaArray();
var files = new MetaArray();
if (filepositions.Length != times.Length)
{
throw new InvalidDataException("keyframes data is invalid");
}
for (int i = 0, len = times.Length; i < len; i++)
{
var time = Convert.ToDouble(times[i]);
if (time - timeLine >= INTERNAL)
{
positions.Add(Convert.ToDouble(filepositions[i]));
files.Add(positions.Length.ToString());
timeLine = time;
}
}
positions.Add(Convert.ToDouble(this.endPosition));
files.Add(positions.Length.ToString());
segments["positions"] = positions;
segments["files"] = files;
return segments;
}
private uint WriteStrictArray(Stream st, MetaArray content)
{
var count = (uint)content.Length;
var byts = BitConverter.GetBytes(count).Reverse().ToArray();
st.Write(byts, 0, byts.Length);
var total = 4u;
for (int i = 0; i < count; i++)
{
total += WriteElement(st, content[i]);
}
return total;
}
private MetaObject GetKeyFrames(MetaObject obj)
{
var vTags = info.Body.Tags.Where(t => t.TagType == TagType.Video && ((t as VideoTag).Data as VideoData).Type == FrameType.KeyFrame);
this.startPosition = info.Body.Tags[0].Start + info.Body.Tags[0].Size + 4;
//this.endPosition = info.Body.Tags.Last().Start + info.Body.Tags.Last().Size + 4;
this.endPosition = info.Body.Start + info.Body.Size;
if (obj.Contains("keyframes"))
{
hasKeyFrames = true;
return obj["keyframes"] as MetaObject;
}
hasKeyFrames = false;
var filepositions = new MetaArray();
var times = new MetaArray();
foreach (var tag in vTags)
{
filepositions.Add(Convert.ToDouble(tag.Start));
times.Add(tag.Header.Timestamp / 1000d);
}
var keyFrames = new MetaObject();
keyFrames["filepositions"] = filepositions;
keyFrames["times"] = times;
return keyFrames;
}
