ANSI SCTE 243-4 pdf free download

ANSI SCTE 243-4 pdf free download.Next Generation Audio Carriage for Cable Systems: Part 4 – DTS-UHD Audio Carriage Constraints.
6 DTS-UHD Compressed MPEG-2 Audio Transport 6.1 Overview The following sections specify the signaling of DTS-UHD audio component in MPEG programs. 6.2 MPEG-2 Systems Signaling 6.2.1 Buffering Model It is recommended that the main audio buffer size (BSn, as defined in ISO/IEC 13818-1 [4] clause 2.4.2) has a fixed value of 66,434 bytes. 6.2.2 DTS-UHD Audio Descriptor The DTS-UHD Audio Descriptor shall be included in the program map section following the relevant ES_ info_ length field for any DTS-UHD audio stream component coded in accordance with TS 103 491 [7] that is included in the MPEG program. The syntax for the DTS-UHD Audio Descriptor shall be as defined in Table 1 below. All values presented in the DTS-UHD descriptor are interpreted as unsigned integer values, most significant bit first.
6.2.3 Semantics for Parameters 6.2.3.1 descriptor_ tag The value of descriptor_ _tag shall be 0x7F and the value of descriptor_ _tag_ extension shall be set to 0x21, as assigned for use in DVB, ATSC and SCTE. 6.2.3.2 DecoderProfileCode This field indicates the DTS-UHD decoder profile required to decode this stream. Valid range of DecoderProfileCode shall be from 0 to 63. The relationship between the DecoderProfile and DecoderProfileCode shall be as follows: DecoderProfile = DecoderProfileCode + 2 where DecoderProfile indicates the DTS-UHD decoder profile as defined in TS 103 491 [7] For DTS- UHD NGA streams, DecoderProfile shall be 3 or greater. Note: When DecoderProfile = 2, the audio_ preselection_ descriptor shall not be present.
6.2.3.7 StreamIndex When a given Audio Program is delivered using multiple streams, StreamIndex is the index used to indicate stream priority for prioritizing mixing metadata. The main stream shall have StreamIndex=0, while auxiliary streams shall have StreamIndex values in the rangeof 1-7. If the Audio Program is delivered in a single stream, StreamIndex shall be 0. The value of StreamIndex shall correspond to the value of StreamID carried in the DTS-UHD BroadcastChunk as defined in SCTE DVS 242-4[3]. 6.2.3.8 reserved_ bits These bits serve to byte align some parameters in the descriptor and may be defined for use in future specifications. For the purposes of this specification, all reserved_ bits shall be set to 0 and ignored by the receiver. 6.2.3.9 ExtendedPayloadBytes The number of bytes, ByteCount, is determined by parsing the parameters defined here and comparing the number of bytes remaining to be parsed based on descriptor length. If ExtendedPayloadBytes exist, receivers built to this this specification shall ignore this data.6.4.5 Multiple Stream Requirements When a given Audio Program is delivered using multiple streams, the Random Access Points of auxiliary streams shall be aligned with the Random Access Points of the main stream. When an Audio Program containing multiple streams is played back, the synchronized audio frames from each stream shall be delivered to the DTS-UHD playback system in sequence from lowest StreamIndex value (which contains the main DTS-UHD stream), in increasing order. This will coincide with the sequentially increasing values of StreamID as indicated in the DTS-UHD BroadcastChunk.
ANSI SCTE 243-4 pdf download.