public async Task <ActionResult> SaveRecordingMobile(HttpPostedFileBase fileInput, string recorderId, string recordingTitle)
{
/*
* 1. Save the original media file to a blob
* 2. Call the remote Transcoding service. Pass the blob name.
* 3. The Transcoding service saves the MP3 file to a blob and returns its name and the recording's duration.
* 4. Create a database record.
*/
if (fileInput == null)
{
return(RedirectToAction("RecordSpeech", new { error = "no_file" }));
}
// return RedirectToAction("RecordSpeech", new { error = "test01" });
var contentType = fileInput.ContentType;
var acceptedContentType = (new[] { MediaType.Amr, MediaType.Gpp, MediaType.QuickTime }).Contains(contentType);
if (!acceptedContentType)
{
return(RedirectToAction("RecordSpeech", new { error = contentType }));
}
var userId = this.GetUserId();
// 1. Save the original file.
// The directory structure in Blob Storage is userIdKey/timeKey/originalFileName.ext
var timeKey = KeyUtils.GetTimeAsBase32();
var fileName = fileInput.FileName;
// Sanitize the fileName. Reserved URL characters must be properly escaped.
fileName = String.IsNullOrWhiteSpace(fileName)
? timeKey
: Uri.EscapeUriString(fileName.Trim());
var invalidChars = Path.GetInvalidFileNameChars();
fileName = new String(fileName.Select(i => invalidChars.Contains(i) ? '_' : i).ToArray());
if (!Path.HasExtension(fileName))
{
Path.ChangeExtension(fileName, MediaType.GetExtension(contentType));
}
var blobName = KeyUtils.IntToKey(userId) + AzureStorageUtils.DefaultDirectoryDelimiter + timeKey + AzureStorageUtils.DefaultDirectoryDelimiter + fileName;
using (var stream = fileInput.InputStream)
{
await AzureStorageUtils.UploadBlobAsync(stream, AzureStorageUtils.ContainerNames.Recordings, blobName, contentType);
}
// 2. Call the transcoding service.
var host = ConfigurationManager.AppSettings["RecorderHost"];
var url = String.Format("http://{0}/api/recordings/transcoded/?inputBlobName={1}", host, blobName);
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.GetAsync(url);
if (!response.IsSuccessStatusCode)
{
return(RedirectToAction("RecordSpeech", new { error = "transcoding_error" }));
}
// 3. Get the results from the service.
// Error is returned as HTML. Then we get error here: No MediaTypeFormatter is available to read an object of type 'JObject' from content with media type 'text/html'.
var value = await response.Content.ReadAsAsync <JObject>();
var outputBlobName = (string)value["outputBlobName"];
var duration = Convert.ToDecimal((int)value["durationMsec"] / 1000.0m);
// The transcoder may return -1 if it has failed to parse the ffmpeg logs.
if (duration < 0)
{
// Read the blob and try to determine the duration directly.
duration = await RecordingUtils.GetMp3Duration(AzureStorageUtils.ContainerNames.Recordings, outputBlobName);
}
// 4. Create a database record.
var exerciseId = await ExerciseUtils.CreateExercise(outputBlobName, userId, ServiceType.IeltsSpeaking, ArtifactType.Mp3,
duration, recordingTitle);
// 5. Redirect to the exercise page.
return(RedirectToAction("View", new { Id = exerciseId }));
}
public async Task <IHttpActionResult> PostTracks(string metadataName)
{
//~~ Validate.
if (!Request.Content.IsMimeMultipartContent())
{
return(BadRequest());
}
// Parse the request body parts.
var streamProvider = await Request.Content.ReadAsMultipartAsync();
// Check mediaType of the files
var mediaTypes = streamProvider.Contents
.Select(i => i.Headers)
.Where(i => i.ContentDisposition.Name.Trim('"') != metadataName)
.Select(i => i.ContentType)
//.Where(i => i != null) // ContentType is null in the 'metadata' part.
.Select(i => i.MediaType)
.Distinct()
;
var mediaType = mediaTypes.FirstOrDefault();
var acceptedMediaTypes = new[] { MediaType.Mpeg, MediaType.Mp3, MediaType.Amr, MediaType.Gpp, MediaType.QuickTime };
if ((mediaTypes.Count() != 1) || !acceptedMediaTypes.Contains(mediaType))
{
return(BadRequest(String.Join(", ", mediaTypes)));
}
//~~ Save the original media files to blobs.
var userId = this.GetUserId(); // May be 0 if the user is unauthenticated
var userIdKey = KeyUtils.IntToKey(userId);
var timeKey = KeyUtils.GetTimeAsBase32();
// The length of extId is 12 chars.
var extId = (userId != 0)
? null
: this.GetExtId();
var longTimeKey = timeKey + extId; // If an operand of string concatenation is null, an empty string is substituted.
var extension = MediaType.GetExtension(mediaType);
var tracks = new List <KeyValuePair <string, MemoryStream> >();
var fileNames = new List <string>();
foreach (var content in streamProvider.Contents)
{
var name = content.Headers.ContentDisposition.Name.Trim('"');
var contentType = content.Headers.ContentType;
// We have checked above, if ContentType has a value, it has the right MediaType.
if ((name != metadataName) && (contentType != null))
{
fileNames.Add(name);
var stream = await content.ReadAsStreamAsync();
using (stream)
{
var memStream = new MemoryStream();
await stream.CopyToAsync(memStream);
var pair = new KeyValuePair <string, MemoryStream>(name, memStream);
tracks.Add(pair);
}
}
}
// Upload all blobs in parallel.
var tasks = tracks.Select(i =>
{
var blobName = ExerciseUtils.FormatBlobName(userIdKey, longTimeKey, i.Key, extension);
return(AzureStorageUtils.UploadBlobAsync(i.Value, AzureStorageUtils.ContainerNames.Artifacts, blobName, mediaType));
});
await Task.WhenAll(tasks);
//~~ Call the transcoding service.
///* We send the file names as a comma separated list. There is also a binding in the Web API like this:
//public IHttpActionResult GetFoo([FromUri] int[] ids); Call: /Foo?ids=1&ids=2&ids=3 or /Foo?ids[0]=1&ids[1]=2&ids[2]=3
//public IHttpActionResult GetFoo([FromUri] List<string> ids); Call: /Foo?ids[]="a"&ids[]="b"&ids[]="c"
//*/
//var host = ConfigurationManager.AppSettings["RecorderHost"];
//var urlFormat = "http://{0}/api/recordings/transcoded/?userIdKey={1}&timeKey={2}&extension={3}&fileNames={4}";
//var url = String.Format(urlFormat, host, userIdKey, longTimeKey, extension, String.Join(",", fileNames));
//HttpClient client = new HttpClient();
//HttpResponseMessage response = await client.GetAsync(url);
//if (!response.IsSuccessStatusCode)
//{
// // return RedirectToAction(referrerAction, new { error = "transcoding_error" });
// return InternalServerError(new Exception("Transcoding error. " + response.StatusCode.ToString()));
//}
//// Error is returned as HTML. Then we get error here: No MediaTypeFormatter is available to read an object of type 'JObject' from content with media type 'text/html'.
//var recordingDetails = await response.Content.ReadAsAsync<RecordingDetails>();
//// Make sure the duration is known. If the transcoder has failed to parse the ffmpeg logs, it returns DurationMsec = 0.
//if (recordingDetails.TotalDuration == 0)
//{
// // Read the blob and try to determine the duration directly.
// recordingDetails.TotalDuration =
// await RecordingUtils.GetMp3Duration(AzureStorageUtils.ContainerNames.Artifacts, recordingDetails.BlobName);
//}
var transcoder = new RecordingTranscoder();
var recordingDetails = await transcoder.Transcode(tracks, userIdKey, longTimeKey, extension);
// Release the memory streams.
tracks.ForEach(i =>
{
i.Value.Dispose();
});
//~~ Read the metadata.
// Chrome wraps the part name in double-quotes.
var metadataContent = streamProvider.Contents
.Single(i => i.Headers.ContentDisposition.Name.Trim('"') == metadataName)
;
var metadataJson = await metadataContent.ReadAsStringAsync();
var metadata = JObject.Parse(metadataJson);
var serviceType = (string)metadata["serviceType"];
var cardId = (Guid?)metadata["cardId"];
var title = (string)metadata["title"];
var comment = (string)metadata["comment"];
var serializer = new JsonSerializer()
{
ContractResolver = new CamelCasePropertyNamesContractResolver()
};
var details = JObject.FromObject(recordingDetails, serializer);
if (userId != 0)
{
//~~ Create a database record.
var exerciseId = await ExerciseUtils.CreateExercise(recordingDetails.BlobName, userId,
serviceType, ArtifactType.Mp3, recordingDetails.TotalDuration, title, cardId, comment, details.ToString(Formatting.None));
//~~ The client will redirect to the View exercise page.
return(Ok(new { ExerciseId = exerciseId }));
}
else
{
//~~ Save the details for future use.
metadata.Add(new JProperty("recordingDetails", details));
var blobName = ExerciseUtils.FormatBlobName(userIdKey, longTimeKey, "metadata", "json");
await AzureStorageUtils.UploadTextAsync(metadata.ToString(), AzureStorageUtils.ContainerNames.Artifacts, blobName, MediaType.Json);
//~~ The client will redirect to the Signup page. longTimeKey will be built from timeKey on the Claim page.
return(Ok(new { Key = timeKey }));
}
}
// TODO OBSOLETE. Do not rename the files parameter. The form inputs are bounded by this name.
public async Task <ActionResult> SaveRecordings(IEnumerable <HttpPostedFileBase> files, string serviceType, Guid?cardId, string title, string comment)
{
/*
* 1. Validate input.
* 2. Save the original media files to blobs.
* 3. Call the remote transcoding service. The service converts files to MP3, merges them into a single file, saves it to a blob and returns its name and the recording's duration.
* 4. Create a database record.
* 5. Redirect to the exercise page.
*/
// 1. Validate input.
// Find out the action to redirect to on error. We use the referrer string. RedirectToAction seems accept a case-insensitive parameter.
var referrerAction = (Request.UrlReferrer.Segments.Skip(2).Take(1).SingleOrDefault() ?? "Index").Trim('/');
//referrerAction = referrerAction.First().ToString().ToUpper() + referrerAction.Substring(1).ToLower();
// var routeData = RouteTable.Routes.GetRouteData(new HttpContextWrapper(httpContext));
if (files == null || files.All(i => i == null))
{
return(RedirectToAction(referrerAction, new { error = "no_file" }));
}
// There may be empty form parts from input elements with no file selected.
var originalFiles = files.Where(i => i != null);
var contentType = originalFiles
.Select(i => i.ContentType)
.Distinct()
.Single()
;
var acceptedContentTypes = (new[] { MediaType.Mpeg, MediaType.Mp3, MediaType.Amr, MediaType.Gpp, MediaType.QuickTime });
if (!acceptedContentTypes.Contains(contentType))
{
return(RedirectToAction(referrerAction, new { error = "wrong_file_format" }));
}
// 2. Save the original media files to blobs.
var userId = this.GetUserId();
var userIdKey = KeyUtils.IntToKey(userId);
var timeKey = KeyUtils.GetTimeAsBase32();
var index = 0;
var extension = MediaType.GetExtension(contentType);
//var blobNames = new List<string>();
foreach (var file in originalFiles)
{
using (var inputStream = file.InputStream)
{
// The directory structure in the Blob Storage is userIdKey/timeKey/index.ext. Runnymede.Helper.Controllers.RecordingsController.Get() relies on this structure.
var blobName = String.Format("{0}/{1}/{2}.{3}", userIdKey, timeKey, index, extension);
await AzureStorageUtils.UploadBlobAsync(inputStream, AzureStorageUtils.ContainerNames.Artifacts, blobName, file.ContentType);
index++;
}
}
// 3. Call the remote transcoding service.
var host = ConfigurationManager.AppSettings["RecorderHost"];
var urlFormat = "http://{0}/api/recordings/transcoded/?userIdKey={1}&timeKey={2}&extension={3}&count={4}";
var url = String.Format(urlFormat, host, userIdKey, timeKey, extension, originalFiles.Count());
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.GetAsync(url);
if (!response.IsSuccessStatusCode)
{
return(RedirectToAction(referrerAction, new { error = "transcoding_error" }));
}
// Error is returned as HTML. Then we get error here: No MediaTypeFormatter is available to read an object of type 'JObject' from content with media type 'text/html'.
var recordingDetails = await response.Content.ReadAsAsync <RecordingDetails>();
// Make sure the duration is known. If the transcoder has failed to parse the ffmpeg logs, it returns DurationMsec = 0.
if (recordingDetails.TotalDuration == 0)
{
// Read the blob and try to determine the duration directly.
recordingDetails.TotalDuration =
await RecordingUtils.GetMp3Duration(AzureStorageUtils.ContainerNames.Artifacts, recordingDetails.BlobName);
}
// 4. Create a database record.
var exerciseId = await ExerciseUtils.CreateExercise(recordingDetails.BlobName, userId,
serviceType, ArtifactType.Mp3, recordingDetails.TotalDuration, title, cardId, comment);
// 5. Redirect to the exercise page.
return(RedirectToAction("View", "Exercises", new { Id = exerciseId }));
}
