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Add Audio Track Analysis models and API endpoint (#161)
* Add Audio Track Analysis models and API endpoint * Update docs * Add link to EchoNest archived docs for AudioAnalysis model
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‎SpotifyAPI.Docs/docs/SpotifyWebAPI/tracks.md‎

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```
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---
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##GetAudioAnalysis
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> Get a detailed audio analysis for a single track identified by its unique Spotify ID.
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**Paramters**
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|Name|Description|Example|
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|--------------|-------------------------|-------------------------|
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|id| The Spotify ID for the track. | `"6Y1CLPwYe7zvI8PJiWVz6T"`
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Returns a AudioAnalysis. This object is currently lacking Spotify documentation but archived [EchoNest documentation](https://web.archive.org/web/20160528174915/http://developer.echonest.com/docs/v4/_static/AnalyzeDocumentation.pdf) is relevant.
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**Usage**
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```cs
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AudioAnalysis analysis = _spotify.GetAudioAnalysis("6Y1CLPwYe7zvI8PJiWVz6T");
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Console.WriteLine(analysis.Meta.DetailedStatus);
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```
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---

‎SpotifyAPI/SpotifyAPI.csproj‎

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<Compile Include="Web\Auth\ClientCredentialsAuth.cs" />
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<Compile Include="Web\Enums\FollowType.cs" />
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<Compile Include="Web\Auth\ImplicitGrantAuth.cs" />
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<Compile Include="Web\Models\AnalysisSegment.cs" />
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<Compile Include="Web\Models\AnalysisTimeSlice.cs" />
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<Compile Include="Web\Models\AnalysisMeta.cs" />
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<Compile Include="Web\Models\AnalysisSection.cs" />
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<Compile Include="Web\Models\AnalysisTrack.cs" />
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<Compile Include="Web\Models\ArrayResponse.cs" />
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<Compile Include="Web\Models\AudioAnalysis.cs" />
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<Compile Include="Web\Models\AudioFeatures.cs" />
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<Compile Include="Web\Models\AvailabeDevices.cs" />
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<Compile Include="Web\Models\BasicModel.cs" />

‎SpotifyAPI/Web/Models/AnalysisMeta.cs‎

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using Newtonsoft.Json;
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namespace SpotifyAPI.Web.Models
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{
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public class AnalysisMeta
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{
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[JsonProperty("analyzer_platform")]
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public string AnalyzerVersion { get; set; }
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[JsonProperty("platform")]
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public string Platform { get; set; }
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[JsonProperty("status_code")]
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public int StatusCode { get; set; }
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[JsonProperty("detailed_status")]
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public string DetailedStatus { get; set; }
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[JsonProperty("timestamp")]
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public long Timestamp { get; set; }
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[JsonProperty("analysis_time")]
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public double AnalysisTime { get; set; }
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[JsonProperty("input_process")]
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public string InputProcess { get; set; }
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}
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}

‎SpotifyAPI/Web/Models/AnalysisSection.cs‎

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using Newtonsoft.Json;
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namespace SpotifyAPI.Web.Models
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{
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public class AnalysisSection
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{
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[JsonProperty("start")]
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public double Start { get; set; }
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[JsonProperty("duration")]
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public double Duration { get; set; }
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[JsonProperty("confidence")]
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public double Confidence { get; set; }
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[JsonProperty("loudness")]
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public double Loudness { get; set; }
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[JsonProperty("tempo")]
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public double Tempo { get; set; }
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[JsonProperty("tempo_confidence")]
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public double TempoConfidence { get; set; }
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[JsonProperty("key")]
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public int Key { get; set; }
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[JsonProperty("key_confidence")]
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public double KeyConfidence { get; set; }
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[JsonProperty("mode")]
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public int Mode { get; set; }
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[JsonProperty("mode_confidence")]
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public double ModeConfidence { get; set; }
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[JsonProperty("time_signature")]
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public int TimeSignature { get; set; }
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[JsonProperty("time_signature_confidence")]
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public double TimeSignatureConfidence { get; set; }
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}
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}

‎SpotifyAPI/Web/Models/AnalysisSegment.cs‎

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using Newtonsoft.Json;
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using System.Collections.Generic;
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namespace SpotifyAPI.Web.Models
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{
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public class AnalysisSegment
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{
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[JsonProperty("start")]
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public double Start { get; set; }
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[JsonProperty("duration")]
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public double Duration { get; set; }
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[JsonProperty("confidence")]
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public double Confidence { get; set; }
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[JsonProperty("loudness_start")]
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public double LoudnessStart { get; set; }
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[JsonProperty("loudness_max_time")]
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public double LoudnessMaxTime { get; set; }
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[JsonProperty("loudness_max")]
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public double LoudnessMax { get; set; }
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[JsonProperty("loudness_end")]
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public double LoudnessEnd { get; set; }
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[JsonProperty("pitches")]
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public List<double> Pitches { get; set; }
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[JsonProperty("timbre")]
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public List<double> Timbre { get; set; }
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}
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}

‎SpotifyAPI/Web/Models/AnalysisTimeSlice.cs‎

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using Newtonsoft.Json;
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namespace SpotifyAPI.Web.Models
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{
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public class AnalysisTimeSlice
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{
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[JsonProperty("start")]
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public double Start { get; set; }
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[JsonProperty("duration")]
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public double Duration { get; set; }
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[JsonProperty("confidence")]
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public double Confidence { get; set; }
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}
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}

‎SpotifyAPI/Web/Models/AnalysisTrack.cs‎

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using Newtonsoft.Json;
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namespace SpotifyAPI.Web.Models
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{
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public class AnalysisTrack
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{
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[JsonProperty("num_samples")]
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public int NumSamples { get; set; }
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[JsonProperty("duration")]
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public double Duration { get; set; }
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[JsonProperty("sample_md5")]
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public string SampleMD5 { get; set; }
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[JsonProperty("offset_seconds")]
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public double OffsetSeconds { get; set; }
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[JsonProperty("window_seconds")]
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public double WindowSeconds { get; set; }
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[JsonProperty("analysis_sample_rate")]
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public int AnalysisSampleRate { get; set; }
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[JsonProperty("analysis_channels")]
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public int AnalysisChannels { get; set; }
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[JsonProperty("end_of_fade_in")]
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public double EndOfFadeIn { get; set; }
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[JsonProperty("start_of_fade_out")]
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public double StartOfFadeOut { get; set; }
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[JsonProperty("loudness")]
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public double Loudness { get; set; }
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[JsonProperty("tempo")]
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public double Tempo { get; set; }
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[JsonProperty("tempo_confidence")]
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public double TempoConfidence { get; set; }
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[JsonProperty("time_signature")]
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public double TimeSignature { get; set; }
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[JsonProperty("time_signature_confidence")]
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public double TimeSignatureConfidence { get; set; }
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[JsonProperty("key")]
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public int Key { get; set; }
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[JsonProperty("key_confidence")]
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public double KeyConfidence { get; set; }
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[JsonProperty("mode")]
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public int Mode { get; set; }
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[JsonProperty("mode_confidence")]
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public double ModeConfidence { get; set; }
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[JsonProperty("codestring")]
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public string Codestring { get; set; }
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[JsonProperty("code_version")]
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public double CodeVersion { get; set; }
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[JsonProperty("echoprintstring")]
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public string Echoprintstring { get; set; }
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[JsonProperty("echoprint_version")]
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public double EchoprintVersion { get; set; }
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[JsonProperty("synchstring")]
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public string Synchstring { get; set; }
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[JsonProperty("synch_version")]
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public double SynchVersion { get; set; }
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[JsonProperty("rhythmstring")]
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public string Rhythmstring { get; set; }
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[JsonProperty("rhythm_version")]
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public double RhythmVersion { get; set; }
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}
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}

‎SpotifyAPI/Web/Models/AudioAnalysis.cs‎

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using Newtonsoft.Json;
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using System.Collections.Generic;
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namespace SpotifyAPI.Web.Models
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{
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public class AudioAnalysis : BasicModel
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{
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[JsonProperty("bars")]
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public List<AnalysisTimeSlice> Bars { get; set; }
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[JsonProperty("beats")]
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public List<AnalysisTimeSlice> Beats { get; set; }
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[JsonProperty("meta")]
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public AnalysisMeta Meta { get; set; }
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[JsonProperty("sections")]
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public List<AnalysisSection> Sections { get; set; }
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[JsonProperty("segments")]
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public List<AnalysisSegment> Segments { get; set; }
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[JsonProperty("tatums")]
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public List<AnalysisTimeSlice> Tatums { get; set; }
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[JsonProperty("track")]
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public AnalysisTrack Track { get; set; }
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}
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}

‎SpotifyAPI/Web/SpotifyWebAPI.cs‎

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return DownloadDataAsync<FullTrack>(_builder.GetTrack(id, market));
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}
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/// <summary>
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/// Get a detailed audio analysis for a single track identified by its unique Spotify ID.
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/// </summary>
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/// <param name="id">The Spotify ID for the track.</param>
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/// <returns></returns>
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/// <remarks>AUTH NEEDED</remarks>
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public AudioAnalysis GetAudioAnalysis(string id)
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{
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return DownloadData<AudioAnalysis>(_builder.GetAudioAnalysis(id));
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}
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/// <summary>
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/// Get a detailed audio analysis for a single track identified by its unique Spotify ID asynchronously.
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/// </summary>
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/// <param name="id">The Spotify ID for the track.</param>
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/// <returns></returns>
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/// <remarks>AUTH NEEDED</remarks>
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public Task<AudioAnalysis> GetAudioAnalysisAsync(string id)
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{
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return DownloadDataAsync<AudioAnalysis>(_builder.GetAudioAnalysis(id));
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}
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/// <summary>
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/// Get audio feature information for a single track identified by its unique Spotify ID.
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/// </summary>

‎SpotifyAPI/Web/SpotifyWebBuilder.cs‎

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return $"{APIBase}/tracks/{id}?market={market}";
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}
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/// <summary>
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/// Get a detailed audio analysis for a single track identified by its unique Spotify ID.
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/// </summary>
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/// <param name="id">The Spotify ID for the track.</param>
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/// <returns></returns>
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/// <remarks>AUTH NEEDED</remarks>
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public string GetAudioAnalysis(string id)
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{
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return $"{APIBase}/audio-analysis/{id}";
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}
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/// <summary>
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/// Get audio feature information for a single track identified by its unique Spotify ID.
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/// </summary>

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