/// <inheritdoc />
public async Task <MediaStream> GetMediaStreamAsync(MediaStreamInfo info)
{
info.EnsureNotNull(nameof(info));
// Get stream
var stream = await _httpClient.GetStreamAsync(info.Url).ConfigureAwait(false);
return(new MediaStream(info, stream));
}
/// <inheritdoc />
public async Task DownloadMediaStreamAsync(MediaStreamInfo info, Stream output,
IProgress <double> progress = null, CancellationToken cancellationToken = default(CancellationToken))
{
info.EnsureNotNull(nameof(info));
output.EnsureNotNull(nameof(output));
// Determine if stream is rate-limited
var isRateLimited = !Regex.IsMatch(info.Url, @"ratebypass[=/]yes");
// Download rate-limited streams in segments
if (isRateLimited)
{
// Determine segment count
const long segmentSize = 9_898_989; // this number was carefully devised through research
var segmentCount = (int)Math.Ceiling(1.0 * info.Size / segmentSize);
// Keep track of bytes copied for progress reporting
var totalBytesCopied = 0L;
for (var i = 0; i < segmentCount; i++)
{
// Determine segment range
var from = i * segmentSize;
var to = (i + 1) * segmentSize - 1;
// Download segment
using (var input = await _httpClient.GetStreamAsync(info.Url, from, to).ConfigureAwait(false))
{
int bytesCopied;
do
{
// Copy
bytesCopied = await input.CopyChunkToAsync(output, cancellationToken).ConfigureAwait(false);
// Report progress
totalBytesCopied += bytesCopied;
progress?.Report(1.0 * totalBytesCopied / info.Size);
} while (bytesCopied > 0);
}
}
}
// Download non-limited streams directly
else
{
using (var input = await GetMediaStreamAsync(info).ConfigureAwait(false))
await input.CopyToAsync(output, progress, cancellationToken).ConfigureAwait(false);
}
}
