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Added IFF sample loader as helper method.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| /******************************************************************************/ | ||
| /* This source, or parts thereof, may be used in any software as long the */ | ||
| /* license of NostalgicPlayer is keep. See the LICENSE file for more */ | ||
| /* information. */ | ||
| /******************************************************************************/ | ||
| namespace Polycode.NostalgicPlayer.Kit.Containers | ||
| { | ||
| /// <summary> | ||
| /// Result from sample loaders | ||
| /// </summary> | ||
| public enum LoadResult | ||
| { | ||
| /// <summary></summary> | ||
| Ok, | ||
| /// <summary></summary> | ||
| UnknownFormat, | ||
| /// <summary></summary> | ||
| Error | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /******************************************************************************/ | ||
| /* This source, or parts thereof, may be used in any software as long the */ | ||
| /* license of NostalgicPlayer is keep. See the LICENSE file for more */ | ||
| /* information. */ | ||
| /******************************************************************************/ | ||
| using System.IO; | ||
| using Polycode.NostalgicPlayer.Kit.Containers; | ||
| using Polycode.NostalgicPlayer.Kit.Streams; | ||
|
|
||
| namespace Polycode.NostalgicPlayer.Kit.Utility | ||
| { | ||
| /// <summary> | ||
| /// Helper class to load IFF samples | ||
| /// </summary> | ||
| public static class IffSampleLoader | ||
| { | ||
| /********************************************************************/ | ||
| /// <summary> | ||
| /// Load an IFF sample and return the data | ||
| /// </summary> | ||
| /********************************************************************/ | ||
| public static LoadResult Load(ModuleStream moduleStream, int sampleNumber, out IffSample iffSample) | ||
| { | ||
| iffSample = null; | ||
|
|
||
| if (moduleStream.Read_B_UINT32() != 0x464f524d) // FORM | ||
| { | ||
| // Seek back again | ||
| moduleStream.Seek(-4, SeekOrigin.Current); | ||
|
|
||
| return LoadResult.UnknownFormat; | ||
| } | ||
|
|
||
| uint formLength = moduleStream.Read_B_UINT32(); | ||
|
|
||
| if (moduleStream.Read_B_UINT32() != 0x38535658) // 8SVX | ||
| { | ||
| // Seek back again | ||
| moduleStream.Seek(-8, SeekOrigin.Current); | ||
|
|
||
| return LoadResult.UnknownFormat; | ||
| } | ||
|
|
||
| formLength -= 4; | ||
|
|
||
| IffSample info = new IffSample(); | ||
|
|
||
| while (formLength > 0) | ||
| { | ||
| uint chunkName = moduleStream.Read_B_UINT32(); | ||
| uint chunkLength = moduleStream.Read_B_UINT32(); | ||
| formLength -= 8; | ||
|
|
||
| if ((chunkLength % 2) != 0) | ||
| chunkLength++; | ||
|
|
||
| switch (chunkName) | ||
| { | ||
| // VHDR | ||
| case 0x56484452: | ||
| { | ||
| info.OneShotHiSamples = moduleStream.Read_B_UINT32(); | ||
| info.RepeatHiSamples = moduleStream.Read_B_UINT32(); | ||
| info.SamplesPerHiCycle = moduleStream.Read_B_UINT32(); | ||
| info.SamplesPerSec = moduleStream.Read_B_UINT16(); | ||
| info.Octaves = moduleStream.Read_UINT8(); | ||
|
|
||
| byte compressed = moduleStream.Read_UINT8(); | ||
| if (compressed != 0) | ||
| return LoadResult.Error; | ||
|
|
||
| info.Volume = moduleStream.Read_B_UINT32(); | ||
|
|
||
| formLength -= 20; | ||
| chunkLength -= 20; | ||
| break; | ||
| } | ||
|
|
||
| // BODY | ||
| case 0x424f4459: | ||
| { | ||
| if ((info.SampleData != null) || (info.Octaves == 0)) | ||
| return LoadResult.Error; | ||
|
|
||
| info.SampleData = moduleStream.ReadSampleData(sampleNumber, (int)chunkLength, out int readBytes); | ||
| if (readBytes != chunkLength) | ||
| return LoadResult.Error; | ||
|
|
||
| formLength -= chunkLength; | ||
| chunkLength = 0; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| if (chunkLength > 0) | ||
| { | ||
| moduleStream.Seek(chunkLength, SeekOrigin.Current); | ||
| formLength -= chunkLength; | ||
| } | ||
| } | ||
|
|
||
| if (info.SampleData == null) | ||
| return LoadResult.Error; | ||
|
|
||
| iffSample = info; | ||
|
|
||
| return LoadResult.Ok; | ||
| } | ||
| } | ||
| } |