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using System; |
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using System.Collections.Generic; |
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using System.Globalization; |
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using System.IO; |
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using System.Windows.Media; |
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namespace SlMML |
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{ |
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enum SequencerStep |
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{ |
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None, |
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Pre, |
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Track, |
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Post |
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} |
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public sealed class Sequencer : MediaStreamSource |
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{ |
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#region 定数の定義 |
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public static readonly int BUFFER_SIZE = 8192; |
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public static readonly int BUFFER_ARRAY_SIZE = 2; |
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private static readonly int BLOCK_ALIGNMENT = 2 * sizeof(short); |
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private static readonly int BUFFER_BLOCK_SIZE = BUFFER_SIZE * BLOCK_ALIGNMENT; |
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private static readonly string WAVE_HEADER = "0100020044ac000010b10200040010000000"; |
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#endregion |
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#region コンストラクタおよびデストラクタの定義 |
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public Sequencer(int multiple) |
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{ |
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m_bufferSize = BUFFER_SIZE * multiple; |
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m_buffer = new short[m_bufferSize << 1]; |
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m_tracks = new List<Track>(); |
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m_multiple = multiple; |
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m_mediaSampleAttributes = new Dictionary<MediaSampleAttributeKeys, string>(); |
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MasterVolume = 100; |
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Channel.Initialize(BUFFER_SIZE * multiple); |
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} |
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#endregion |
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#region MediaStreamSourceの派生メソッドの定義 |
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protected override void OpenMediaAsync() |
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{ |
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m_timestampBlock = (long)Math.Round((decimal)(TimeSpan.FromSeconds(1).Ticks / (BUFFER_BLOCK_SIZE * m_multiple))); |
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Dictionary<MediaStreamAttributeKeys, string> mediaStreamAttributes = new Dictionary<MediaStreamAttributeKeys, string>(); |
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mediaStreamAttributes[MediaStreamAttributeKeys.CodecPrivateData] = WAVE_HEADER; |
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description = new MediaStreamDescription(MediaStreamType.Audio, mediaStreamAttributes); |
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Dictionary<MediaSourceAttributesKeys, string> mediaSourceAttributes = new Dictionary<MediaSourceAttributesKeys, string>(); |
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mediaSourceAttributes[MediaSourceAttributesKeys.CanSeek] = false.ToString(); |
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mediaSourceAttributes[MediaSourceAttributesKeys.Duration] = m_tracks[Track.TEMPO_TRACK].Duration.TimeSpan.Ticks.ToString(CultureInfo.InvariantCulture); |
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List<MediaStreamDescription> availableMediaStreams = new List<MediaStreamDescription>(); |
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availableMediaStreams.Add(new MediaStreamDescription(MediaStreamType.Audio, mediaStreamAttributes)); |
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ReportOpenMediaCompleted(mediaSourceAttributes, availableMediaStreams); |
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ReportGetSampleProgress(0); |
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GetSamples(); |
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} |
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protected override void CloseMedia() |
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{ |
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} |
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protected override void GetDiagnosticAsync(MediaStreamSourceDiagnosticKind diagnosticKind) |
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{ |
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ReportGetDiagnosticCompleted(diagnosticKind, 0); |
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} |
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protected override void GetSampleAsync(MediaStreamType mediaStreamType) |
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{ |
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MediaStreamSample sample; |
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if (m_endCount > 1) |
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{ |
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sample = new MediaStreamSample(description, null, 0, 0, 0, m_mediaSampleAttributes); |
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ReportGetSampleCompleted(sample); |
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} |
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else |
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{ |
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using (MemoryStream stream = new MemoryStream(BUFFER_BLOCK_SIZE)) |
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using (BinaryWriter writer = new BinaryWriter(stream)) |
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{ |
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int index = m_count * BUFFER_SIZE; |
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double volume = Math.Min(MasterVolume, 100) / 100; |
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for (int i = index; i < index + BUFFER_SIZE; i++) |
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{ |
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int bufferIndex = i << 1; |
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writer.Write((short)(m_buffer[bufferIndex] * volume)); |
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writer.Write((short)(m_buffer[bufferIndex + 1] * volume)); |
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} |
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m_count++; |
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m_timestampIndex += m_timestampBlock; |
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sample = new MediaStreamSample(description, stream, 0, BUFFER_BLOCK_SIZE, m_timestampIndex, m_mediaSampleAttributes); |
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ReportGetSampleCompleted(sample); |
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} |
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} |
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if (m_count == m_multiple) |
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{ |
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GetSamples(); |
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m_count = 0; |
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if ((m_tracks[Track.TEMPO_TRACK]).End) |
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m_endCount++; |
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} |
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} |
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protected override void SeekAsync(long seekToTime) |
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{ |
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ReportSeekCompleted(seekToTime); |
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} |
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protected override void SwitchMediaStreamAsync(MediaStreamDescription mediaStreamDescription) |
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{ |
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ReportSwitchMediaStreamCompleted(mediaStreamDescription); |
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} |
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#endregion |
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#region 公開メソッドの定義 |
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public void ClearTracks() |
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{ |
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m_tracks.Clear(); |
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} |
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public void AddTrack(Track track) |
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{ |
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m_tracks.Add(track); |
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} |
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public void CreatePipes(int number) |
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{ |
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Channel.CreatePipes(number); |
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} |
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#endregion |
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#region 非公開メソッドの定義 |
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private void GetSamples() |
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{ |
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bool loop = true; |
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int blen = Math.Min((BUFFER_SIZE << 2), m_bufferSize); |
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int offset = 0; |
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int trackIndex = 0; |
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int trackCount = m_tracks.Count; |
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SequencerStep step = SequencerStep.Pre; |
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while (loop) |
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{ |
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switch (step) |
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{ |
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case SequencerStep.Pre: |
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for (int i = (m_bufferSize << 1) - 1; i >= 0; i--) |
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m_buffer[i] = (0.0).ToShort(); |
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if (trackCount > 0) |
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{ |
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Track track = m_tracks[Track.TEMPO_TRACK]; |
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track.GetSamples(ref m_buffer, 0, m_bufferSize, false); |
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} |
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step = SequencerStep.Track; |
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trackIndex = Track.FIRST_TRACK; |
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offset = 0; |
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break; |
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case SequencerStep.Track: |
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if (trackIndex >= trackCount) |
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step = SequencerStep.Post; |
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else |
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{ |
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Track track = m_tracks[trackIndex]; |
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track.GetSamples(ref m_buffer, offset, offset + blen, true); |
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offset += blen; |
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if (offset >= m_bufferSize) |
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{ |
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offset = 0; |
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trackIndex++; |
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//m_buffered = (m_trackIndex + 1.0) / (trackCount + 1.0); |
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} |
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} |
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break; |
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case SequencerStep.Post: |
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loop = false; |
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break; |
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} |
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} |
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} |
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#endregion |
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#region 公開プロパティの定義 |
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public uint MasterVolume |
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{ |
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get; |
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set; |
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} |
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#endregion |
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#region メンバー変数の定義 |
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private Dictionary<MediaSampleAttributeKeys, string> m_mediaSampleAttributes; |
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private MediaStreamDescription description; |
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private List<Track> m_tracks; |
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private short[] m_buffer; |
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private long m_timestampIndex; |
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private long m_timestampBlock; |
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private int m_bufferSize; |
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private int m_multiple; |
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private int m_count; |
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private int m_endCount; |
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#endregion |
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} |
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} |