shaka-packager/packager/mpd/base/media_info.proto

// This file defines the protocol between Muxer and classes for generating MPD
// files.

syntax = "proto2";

package shaka;

message Range {
  optional uint64 begin = 1;
  optional uint64 end = 2;
}

message MediaInfo {
  enum ContainerType {
    CONTAINER_UNKNOWN = 0;
    CONTAINER_MP4 = 1;
    CONTAINER_MPEG2_TS= 2;
    CONTAINER_WEBM = 3;
    CONTAINER_TEXT = 4;
  }

  message VideoInfo {
    optional string codec = 1;

    // The width and height of the actual number of pixels. This will not be the
    // same as the visual width and height if the sample aspect ratio (sar)
    // is not 1:1.
    optional uint32 width = 2;
    optional uint32 height = 3;

    optional uint32 time_scale = 4;
    // Relative to |time_scale|. IOW |time_scale| / |frame_duration| is the
    // framerate.
    optional uint64 frame_duration = 5;
    optional bytes decoder_config = 6;

    // pixel_width:pixel_height is the the sample aspect ratio (sar) of the
    // video.
    // Note that (pixel_width * width):(pixel_height * height) is the picture
    // aspect ratio, or the @par attribute set on AdaptationSet element.
    optional uint32 pixel_width = 7;
    optional uint32 pixel_height = 8;

    // trick_play_rate: sample rate of the key frame from the original stream.
    // e.g., 1 means every key frame, 2 means every two key frames.
    optional uint32 trick_play_rate = 9;
    // playback_rate: the playout capability (e.g., 4x, 8x, 16x fast foward) of
    // the trick play stream.
    optional uint32 playback_rate = 10;
  }

  message AudioInfo {
    optional string codec = 1;
    optional uint32 sampling_frequency = 2;
    optional uint32 time_scale = 3;
    optional uint32 num_channels = 4;
    optional string language = 5;
    optional bytes decoder_config = 6;
    optional AudioCodecSpecificData codec_specific_data = 7;
  }

  message AudioCodecSpecificData {
    // EC3 Channel map bit fields, encoded based on ETSI TS 102 366 V1.3.1
    // Digital Audio Compression (AC-3, Enhanced AC-3) Standard E.1.3.1.8.
    optional uint32 ec3_channel_map = 1;
  }

  message TextInfo {
    enum TextType {
      UNKNOWN = 0;
      CAPTION = 1;
      SUBTITLE = 2;
    }
    optional string format = 1;
    optional string language = 2;
    optional TextType type = 3;
  }

  message ProtectedContent {
    message ContentProtectionEntry {
      // Human readable UUID of the DRM.
      optional string uuid = 1;
      // Human readable DRM name and version string.
      // e.g. "My Content Protection v1.0"
      optional string name_version = 2;
      // The raw 'pssh' box for the media.
      optional bytes pssh = 3;
    }

    // The default key ID for the encrypted media.
    optional bytes default_key_id = 1;
    repeated ContentProtectionEntry content_protection_entry = 2;
    // Specifies the protection scheme: 'cenc', 'cens', 'cbc1', 'cbcs'.
    // "cbca" is also valid which is a place holder for SAMPLE-AES encryption.
    optional string protection_scheme = 3 [default = 'cenc'];
  }

  // TODO(rkuroiwa): Remove this. <ContentProtection> element that must be added
  // should be done by directly using the MpdBuilder interface.
  // Use this to specify ContentProtection elements that should be set in
  // the MPD, if ContentProtectionEntry is not sufficient.
  message ContentProtectionXml {
    message AttributeNameValuePair {
      optional string name = 1;
      optional string value = 2;
    }

    message Element {
      optional string name = 1;
      repeated AttributeNameValuePair attributes = 2;
      repeated Element subelements = 3;
    }

    // These two string fields are specified by the MPD spec. Just for
    // clarification, the string set in |value| is the rhs of 'value' field in
    // <ContentProtection>.
    optional string scheme_id_uri = 1;
    optional string value = 2;
    repeated AttributeNameValuePair attributes = 3;
    repeated Element subelements = 4;
  }

  optional uint32 bandwidth = 1;

  // Note that DASH IOP v3.0 explicitly mentions that a segment should only
  // have one {video, audio, text} track.
  optional VideoInfo video_info = 2;
  optional AudioInfo audio_info = 3;
  optional TextInfo text_info = 4;
  repeated ContentProtectionXml content_protections = 5;

  // This is set if the content is protected with a content protection,
  // i.e. encrypted.
  optional ProtectedContent protected_content = 15;

  // This is the reference time scale if there are multiple VideoInfo and/or
  // AudioInfo.
  optional uint32 reference_time_scale = 13;
  optional ContainerType container_type = 14 [default = CONTAINER_UNKNOWN];

  // VOD only.
  optional Range init_range = 6;
  optional Range index_range = 7;
  optional string media_file_name = 8;
  // END VOD only.

  // VOD and static LIVE.
  optional float media_duration_seconds = 9;

  // LIVE only.
  optional string init_segment_name = 10;
  optional string segment_template = 11;
  // This value is the user input “segment duration”.
  // This value is not necessarily the same as the value passed to
  // MpdNotifier::NotifyNewSegment().
  optional float segment_duration_seconds = 12;
  // END LIVE only.
}