public async Task <string> DownloadVideo(Video arg, FileUploadProcessHandler handler)
{
if (arg.Constructor == Constructor.videoEmpty)
{
return(null);
}
VideoConstructor video = (VideoConstructor)arg;
TLApi api = await session.GetFileSession(video.dc_id);
InputFileLocation inputFile = TL.inputVideoFileLocation(video.id, video.access_hash);
string videoPath = GetVideoPath(video);
string tempVideoPath = videoPath + ".tmp";
int allSize = video.size;
int chunkSize = 128 * 1024;
int chunksCount = allSize / chunkSize;
int lastChunkSize = allSize - chunkSize * chunksCount;
int allChunksCount = chunksCount + (lastChunkSize != 0 ? 1 : 0);
using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication()) {
if (storage.FileExists(videoPath))
{
return(videoPath);
}
using (Stream stream = new IsolatedStorageFileStream(tempVideoPath, FileMode.OpenOrCreate, FileAccess.Write, storage)) {
for (int i = 0; i < chunksCount; i++)
{
handler((float)i * (float)chunkSize / (float)allSize);
Upload_fileConstructor chunk = (Upload_fileConstructor)await api.upload_getFile(inputFile, i *chunkSize, chunkSize);
stream.Write(chunk.bytes, 0, chunk.bytes.Length);
}
if (lastChunkSize != 0)
{
handler((float)chunksCount * (float)chunkSize / (float)allSize);
Upload_fileConstructor lastChunk = (Upload_fileConstructor)await api.upload_getFile(inputFile, chunksCount *chunkSize, lastChunkSize);
stream.Write(lastChunk.bytes, 0, lastChunk.bytes.Length);
}
handler(1.0f);
}
if (storage.FileExists(videoPath))
{
storage.DeleteFile(videoPath);
}
storage.MoveFile(tempVideoPath, videoPath);
}
return(videoPath);
}