fix: Fix CMCD property mangling (shaka-project#3842)

Move CMCD type definition to externs to avoid minifying property names

Co-authored-by: Dan Sparacio <[email protected]>

Fixes shaka-project#3839

externs/cmcd.js

@@ -0,0 +1,176 @@
+/**
+ *  @externs
+ */
+
+/**
+ * @typedef {{
+ *   br: (number|undefined),
+ *   d: (number|undefined),
+ *   ot: (string|undefined),
+ *   tb: (number|undefined),
+ *   bl: (number|undefined),
+ *   dl: (number|undefined),
+ *   mtp: (number|undefined),
+ *   nor: (string|undefined),
+ *   nrr: (string|undefined),
+ *   su: (boolean|undefined),
+ *   cid: (string|undefined),
+ *   pr: (number|undefined),
+ *   sf: (string|undefined),
+ *   sid: (string|undefined),
+ *   st: (string|undefined),
+ *   v: (number|undefined),
+ *   bs: (boolean|undefined),
+ *   rtp: (number|undefined)
+ * }}
+ *
+ * @description
+ *   Client Media Common Data (CMCD) data.
+ *
+ * @property {number} br
+ *   The encoded bitrate of the audio or video object being requested. This may
+ *   not be known precisely by the player; however, it MAY be estimated based
+ *   upon playlist/manifest declarations. If the playlist declares both peak and
+ *   average bitrate values, the peak value should be transmitted.
+ *
+ * @property {number} d
+ *   The playback duration in milliseconds of the object being requested. If a
+ *   partial segment is being requested, then this value MUST indicate the
+ *   playback duration of that part and not that of its parent segment. This
+ *   value can be an approximation of the estimated duration if the explicit
+ *   value is not known.
+ *
+ * @property {string} ot
+ *   The media type of the current object being requested:
+ *   - `m` = text file, such as a manifest or playlist
+ *   - `a` = audio only
+ *   - `v` = video only
+ *   - `av` = muxed audio and video
+ *   - `i` = init segment
+ *   - `c` = caption or subtitle
+ *   - `tt` = ISOBMFF timed text track
+ *   - `k` = cryptographic key, license or certificate.
+ *   - `o` = other
+ *
+ *   If the object type being requested is unknown, then this key MUST NOT be
+ *   used.
+ *
+ * @property {number} tb
+ *   The highest bitrate rendition in the manifest or playlist that the client
+ *   is allowed to play, given current codec, licensing and sizing constraints.
+ *
+ * @property {number} bl
+ *   The buffer length associated with the media object being requested. This
+ *   value MUST be rounded to the nearest 100 ms. This key SHOULD only be sent
+ *   with an object type of ‘a’, ‘v’ or ‘av’.
+ *
+ * @property {number} dl
+ *   Deadline from the request time until the first sample of this
+ *   Segment/Object needs to be available in order to not create a buffer
+ *   underrun or any other playback problems. This value MUST be rounded to the
+ *   nearest 100ms. For a playback rate of 1, this may be equivalent to the
+ *   player’s remaining buffer length.
+ *
+ * @property {number} mtp
+ *   The throughput between client and server, as measured by the client and
+ *   MUST be rounded to the nearest 100 kbps. This value, however derived,
+ *   SHOULD be the value that the client is using to make its next Adaptive
+ *   Bitrate switching decision. If the client is connected to multiple
+ *   servers concurrently, it must take care to report only the throughput
+ *   measured against the receiving server. If the client has multiple
+ *   concurrent connections to the server, then the intent is that this value
+ *   communicates the aggregate throughput the client sees across all those
+ *   connections.
+ *
+ * @property {string} nor
+ *   Relative path of the next object to be requested. This can be used to
+ *   trigger pre-fetching by the CDN. This MUST be a path relative to the
+ *   current request. This string MUST be URLEncoded. The client SHOULD NOT
+ *   depend upon any pre-fetch action being taken - it is merely a request for
+ *   such a pre-fetch to take place.
+ *
+ * @property {string} nrr
+ *   If the next request will be a partial object request, then this string
+ *   denotes the byte range to be requested. If the ‘nor’ field is not set, then
+ *   the object is assumed to match the object currently being requested. The
+ *   client SHOULD NOT depend upon any pre-fetch action being taken – it is
+ *   merely a request for such a pre-fetch to take place. Formatting is similar
+ *   to the HTTP Range header, except that the unit MUST be ‘byte’, the ‘Range:’
+ *   prefix is NOT required and specifying multiple ranges is NOT allowed. Valid
+ *   combinations are:
+ *
+ *   - `"\<range-start\>-"`
+ *   - `"\<range-start\>-\<range-end\>"`
+ *   - `"-\<suffix-length\>"`
+ *
+ * @property {boolean} su
+ *   Key is included without a value if the object is needed urgently due to
+ *   startup, seeking or recovery after a buffer-empty event. The media SHOULD
+ *   not be rendering when this request is made. This key MUST not be sent if it
+ *   is FALSE.
+ *
+ * @property {string} cid
+ *   A unique string identifying the current content. Maximum length is 64
+ *   characters. This value is consistent across multiple different sessions and
+ *   devices and is defined and updated at the discretion of the service
+ *   provider.
+ *
+ * @property {number} pr
+ *   The playback rate. `1` if real-time, `2` if double speed, `0` if not
+ *   playing. SHOULD only be sent if not equal to `1`.
+ *
+ * @property {string} sf
+ *   The streaming format that defines the current request.
+ *
+ *   - `d` = MPEG DASH
+ *   - `h` = HTTP Live Streaming (HLS)
+ *   - `s` = Smooth Streaming
+ *   - `o` = other
+ *
+ *   If the streaming format being requested is unknown, then this key MUST NOT
+ *   be used.
+ *
+ * @property {string} sid
+ *   A GUID identifying the current playback session. A playback session
+ *   typically ties together segments belonging to a single media asset. Maximum
+ *   length is 64 characters. It is RECOMMENDED to conform to the UUID
+ *   specification.
+ *
+ * @property {string} st
+ *   Stream type
+ *   - `v` = all segments are available – e.g., VOD
+ *   - `l` = segments become available over time – e.g., LIVE
+ *
+ * @property {number} v
+ *   The version of this specification used for interpreting the defined key
+ *   names and values. If this key is omitted, the client and server MUST
+ *   interpret the values as being defined by version 1. Client SHOULD omit this
+ *   field if the version is 1.
+ *
+ * @property {boolean} bs
+ *   Buffer starvation key is included without a value if the buffer was starved
+ *   at some point between the prior request and this object request, resulting
+ *   in the player being in a rebuffering state and the video or audio playback
+ *   being stalled. This key MUST NOT be sent if the buffer was not starved
+ *   since the prior request.
+ *
+ *   If the object type `ot` key is sent along with this key, then the `bs` key
+ *   refers to the buffer associated with the particular object type. If no
+ *   object type is communicated, then the buffer state applies to the current
+ *   session.
+ *
+ * @property {number} rtp
+ *   Requested maximum throughput
+ *
+ *   The requested maximum throughput that the client considers sufficient for
+ *   delivery of the asset. Values MUST be rounded to the nearest 100kbps. For
+ *   example, a client would indicate that the current segment, encoded at
+ *   2Mbps, is to be delivered at no more than 10Mbps, by using rtp=10000.
+ *
+ *   Note: This can benefit clients by preventing buffer saturation through
+ *   over-delivery and can also deliver a community benefit through fair-share
+ *   delivery. The concept is that each client receives the throughput necessary
+ *   for great performance, but no more. The CDN may not support the rtp
+ *   feature.
+ */
+var CmcdData;