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Merge pull request #2022 from lissyx/expose-metadata
Expose extended metadata information to bindings
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60 changes: 60 additions & 0 deletions
60
native_client/dotnet/DeepSpeechClient/Extensions/NativeExtensions.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| using DeepSpeechClient.Structs; | ||
| using System; | ||
| using System.Runtime.InteropServices; | ||
| using System.Text; | ||
|
|
||
| namespace DeepSpeechClient.Extensions | ||
| { | ||
| internal static class NativeExtensions | ||
| { | ||
| /// <summary> | ||
| /// Converts native pointer to UTF-8 encoded string. | ||
| /// </summary> | ||
| /// <param name="intPtr">Native pointer.</param> | ||
| /// <param name="releasePtr">Optional parameter to release the native pointer.</param> | ||
| /// <returns>Result string.</returns> | ||
| internal static string PtrToString(this IntPtr intPtr, bool releasePtr = true) | ||
| { | ||
| int len = 0; | ||
| while (Marshal.ReadByte(intPtr, len) != 0) ++len; | ||
| byte[] buffer = new byte[len]; | ||
| Marshal.Copy(intPtr, buffer, 0, buffer.Length); | ||
| if (releasePtr) | ||
| NativeImp.DS_FreeString(intPtr); | ||
| string result = Encoding.UTF8.GetString(buffer); | ||
| return result; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Converts a pointer into managed metadata object. | ||
| /// </summary> | ||
| /// <param name="intPtr">Native pointer.</param> | ||
| /// <returns>Metadata managed object.</returns> | ||
| internal static Models.Metadata PtrToMetadata(this IntPtr intPtr) | ||
| { | ||
| var managedMetaObject = new Models.Metadata(); | ||
| var metaData = (Metadata)Marshal.PtrToStructure(intPtr, typeof(Metadata)); | ||
|
|
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| managedMetaObject.Items = new Models.MetadataItem[metaData.num_items]; | ||
| managedMetaObject.Probability = metaData.probability; | ||
|
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| //we need to manually read each item from the native ptr using its size | ||
| var sizeOfMetaItem = Marshal.SizeOf(typeof(MetadataItem)); | ||
| for (int i = 0; i < metaData.num_items; i++) | ||
| { | ||
| var tempItem = Marshal.PtrToStructure<MetadataItem>(metaData.items); | ||
| managedMetaObject.Items[i] = new Models.MetadataItem | ||
| { | ||
| Timestep = tempItem.timestep, | ||
| StartTime = tempItem.start_time, | ||
| Character = tempItem.character.PtrToString(releasePtr: false) | ||
| }; | ||
| //we keep the offset on each read | ||
| metaData.items += sizeOfMetaItem; | ||
| } | ||
| NativeImp.DS_FreeMetadata(intPtr); | ||
| return managedMetaObject; | ||
| } | ||
| } | ||
| } |
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