diff options
Diffstat (limited to 'MediaBrowser.Api/Playback/Dash/ManifestBuilder.cs')
| -rw-r--r-- | MediaBrowser.Api/Playback/Dash/ManifestBuilder.cs | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/MediaBrowser.Api/Playback/Dash/ManifestBuilder.cs b/MediaBrowser.Api/Playback/Dash/ManifestBuilder.cs new file mode 100644 index 000000000..35e252a19 --- /dev/null +++ b/MediaBrowser.Api/Playback/Dash/ManifestBuilder.cs @@ -0,0 +1,224 @@ +using System; +using System.Globalization; +using System.Security; +using System.Text; + +namespace MediaBrowser.Api.Playback.Dash +{ + public class ManifestBuilder + { + protected readonly CultureInfo UsCulture = new CultureInfo("en-US"); + + public string GetManifestText(StreamState state, string playlistUrl) + { + var builder = new StringBuilder(); + + var time = TimeSpan.FromTicks(state.RunTimeTicks.Value); + + var duration = "PT" + time.Hours.ToString("00", UsCulture) + "H" + time.Minutes.ToString("00", UsCulture) + "M" + time.Seconds.ToString("00", UsCulture) + ".00S"; + + builder.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); + + builder.AppendFormat( + "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns=\"urn:mpeg:dash:schema:mpd:2011\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\" profiles=\"urn:mpeg:dash:profile:isoff-live:2011\" type=\"static\" mediaPresentationDuration=\"{0}\" minBufferTime=\"PT5.0S\">", + duration); + + builder.Append("<ProgramInformation>"); + builder.Append("</ProgramInformation>"); + + builder.Append("<Period start=\"PT0S\">"); + builder.Append(GetVideoAdaptationSet(state, playlistUrl)); + builder.Append(GetAudioAdaptationSet(state, playlistUrl)); + builder.Append("</Period>"); + + builder.Append("</MPD>"); + + return builder.ToString(); + } + + private string GetVideoAdaptationSet(StreamState state, string playlistUrl) + { + var builder = new StringBuilder(); + + builder.Append("<AdaptationSet id=\"video\" segmentAlignment=\"true\" bitstreamSwitching=\"true\">"); + builder.Append(GetVideoRepresentationOpenElement(state)); + + AppendSegmentList(state, builder, "0", playlistUrl); + + builder.Append("</Representation>"); + builder.Append("</AdaptationSet>"); + + return builder.ToString(); + } + + private string GetAudioAdaptationSet(StreamState state, string playlistUrl) + { + var builder = new StringBuilder(); + + builder.Append("<AdaptationSet id=\"audio\" segmentAlignment=\"true\" bitstreamSwitching=\"true\">"); + builder.Append(GetAudioRepresentationOpenElement(state)); + + builder.Append("<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"6\" />"); + + AppendSegmentList(state, builder, "1", playlistUrl); + + builder.Append("</Representation>"); + builder.Append("</AdaptationSet>"); + + return builder.ToString(); + } + + private string GetVideoRepresentationOpenElement(StreamState state) + { + var codecs = GetVideoCodecDescriptor(state); + + var mime = "video/mp4"; + + var xml = "<Representation id=\"0\" mimeType=\"" + mime + "\" codecs=\"" + codecs + "\""; + + if (state.OutputWidth.HasValue) + { + xml += " width=\"" + state.OutputWidth.Value.ToString(UsCulture) + "\""; + } + if (state.OutputHeight.HasValue) + { + xml += " height=\"" + state.OutputHeight.Value.ToString(UsCulture) + "\""; + } + if (state.OutputVideoBitrate.HasValue) + { + xml += " bandwidth=\"" + state.OutputVideoBitrate.Value.ToString(UsCulture) + "\""; + } + + xml += ">"; + + return xml; + } + + private string GetAudioRepresentationOpenElement(StreamState state) + { + var codecs = GetAudioCodecDescriptor(state); + + var mime = "audio/mp4"; + + var xml = "<Representation id=\"1\" mimeType=\"" + mime + "\" codecs=\"" + codecs + "\""; + + if (state.OutputAudioSampleRate.HasValue) + { + xml += " audioSamplingRate=\"" + state.OutputAudioSampleRate.Value.ToString(UsCulture) + "\""; + } + if (state.OutputAudioBitrate.HasValue) + { + xml += " bandwidth=\"" + state.OutputAudioBitrate.Value.ToString(UsCulture) + "\""; + } + + xml += ">"; + + return xml; + } + + private string GetVideoCodecDescriptor(StreamState state) + { + // https://developer.apple.com/library/ios/documentation/networkinginternet/conceptual/streamingmediaguide/FrequentlyAskedQuestions/FrequentlyAskedQuestions.html + // http://www.chipwreck.de/blog/2010/02/25/html-5-video-tag-and-attributes/ + + var level = state.TargetVideoLevel ?? 0; + var profile = state.TargetVideoProfile ?? string.Empty; + + if (profile.IndexOf("high", StringComparison.OrdinalIgnoreCase) != -1) + { + if (level >= 4.1) + { + return "avc1.640028"; + } + + if (level >= 4) + { + return "avc1.640028"; + } + + return "avc1.64001f"; + } + + if (profile.IndexOf("main", StringComparison.OrdinalIgnoreCase) != -1) + { + if (level >= 4) + { + return "avc1.4d0028"; + } + + if (level >= 3.1) + { + return "avc1.4d001f"; + } + + return "avc1.4d001e"; + } + + if (level >= 3.1) + { + return "avc1.42001f"; + } + + return "avc1.42E01E"; + } + + private string GetAudioCodecDescriptor(StreamState state) + { + // https://developer.apple.com/library/ios/documentation/networkinginternet/conceptual/streamingmediaguide/FrequentlyAskedQuestions/FrequentlyAskedQuestions.html + + if (string.Equals(state.OutputAudioCodec, "mp3", StringComparison.OrdinalIgnoreCase)) + { + return "mp4a.40.34"; + } + + // AAC 5ch + if (state.OutputAudioChannels.HasValue && state.OutputAudioChannels.Value >= 5) + { + return "mp4a.40.5"; + } + + // AAC 2ch + return "mp4a.40.2"; + } + + private void AppendSegmentList(StreamState state, StringBuilder builder, string type, string playlistUrl) + { + var extension = ".m4s"; + + var seconds = TimeSpan.FromTicks(state.RunTimeTicks ?? 0).TotalSeconds; + + var queryStringIndex = playlistUrl.IndexOf('?'); + var queryString = queryStringIndex == -1 ? string.Empty : playlistUrl.Substring(queryStringIndex); + + var index = 0; + var duration = 1000000 * state.SegmentLength; + builder.AppendFormat("<SegmentList timescale=\"1000000\" duration=\"{0}\" startNumber=\"1\">", duration.ToString(CultureInfo.InvariantCulture)); + + while (seconds > 0) + { + var filename = index == 0 + ? "init" + : (index - 1).ToString(UsCulture); + + var segmentUrl = string.Format("dash/{3}/{0}{1}{2}", + filename, + extension, + SecurityElement.Escape(queryString), + type); + + if (index == 0) + { + builder.AppendFormat("<Initialization sourceURL=\"{0}\"/>", segmentUrl); + } + else + { + builder.AppendFormat("<SegmentURL media=\"{0}\"/>", segmentUrl); + } + + seconds -= state.SegmentLength; + index++; + } + builder.Append("</SegmentList>"); + } + } +} |