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Content for  TS 26.119  Word version:  18.0.0

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7 Visual functions and capabilities  7.1 Decoding capabilities  7.1.1 Single decoder instance  7.1.2 Concurrent decoding capabilities  7.1.2.1 Definition  7.1.2.2 Capabilities  7.2 Encoding capabilities  7.2.1 Single encoder instance  7.3 Capability exchange 
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7  Visual functions and capabilities  p. 19

7.1  Decoding capabilities  p. 19

7.1.1  Single decoder instance  p. 19

The following video decoding capabilities are defined:
  • AVC-FullHD-Dec: the capability to decode H.264 (AVC) Progressive High Profile Level 4.0 [7] bitstreams.
  • AVC-UHD-Dec: the capability to decode H.264 (AVC) Progressive High Profile Level 5.1 [7] bitstreams with the following additional requirements:
    • the maximum VCL Bit Rate is constrained to be 120 Mbps with cpbBrVclFactor and cpbBrNalFactor being fixed to be 1250 and 1500, respectively; and,
    • the bitstream does not contain more than 10 slices per picture.
  • AVC-8K-Dec: the capability to decode H.264 (AVC) Progressive High Profile Level 6.1 [7] bitstreams with the following requirements:
    • the maximum VCL Bit Rate is constrained to be 120 Mbps with cpbBrVclFactor and cpbBrNalFactor being fixed to be 1250 and 1500, respectively; and,
    • the bitstream does not contain more than 16 slices per picture.
    • the bitstream shall not include horizontal motion vector component values that exceed the range from -2048 to 2047, inclusive, or that have vertical motion vector component values that exceed the range from -512 to 511, inclusive, in units of ¼ luma sample displacement. This constraint should be indicated by using values of log2_max_mv_length_horizontal less than or equal to 11 and values of log2_max_mv_length_vertical less than or equal to 9.
  • HEVC-FullHD-Dec: the capability to decode H.265 (HEVC) Main10 Profile, Main Tier, Level 4.1 [8] bitstreams that have general_progressive_source_flag equal to 1, general interlaced_source_flag equal to 0, general_non_packed_constraint_flag equal to 1 and general_frame_only_constraint_flag equal to 1.
  • HEVC-UHD-Dec: the capability to decode H.265 (HEVC) Main10 Profile, Main Tier, Level 5.1 [8] bitstreams that have general_progressive_source_flag equal to 1, general interlaced_source_flag equal to 0, general_non_packed_constraint_flag equal to 1 and general_frame_only_constraint_flag equal to 1.
  • HEVC-8K-Dec: the capability to decode H.265 (HEVC) Main10 Profile, Main Tier, Level 6.1 [8] bitstreams that have general_progressive_source_flag equal to 1, general interlaced_source_flag equal to 0, general_non_packed_constraint_flag equal to 1, and general_frame_only_constraint_flag equal to 1 with the following additional requirements:
    • the bitstream does not exceed the maximum luma picture size in samples of 33,554,432; and,
    • the maximum VCL Bit Rate is constrained to be 80 Mbps with CpbVclFactor and CpbNalFactor being fixed to be 1000 and 1100, respectively.
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7.1.2  Concurrent decoding capabilities  p. 19

7.1.2.1  Definition  p. 19

Concurrent video decoder instances are defined as follows.
For N video bitstreams encoded according to a video codec profile, decoding units flow into the coded picture buffer (CPB) for each stream according to a specified arrival schedule and are delivered by the common Hypothetical Stream Scheduler (HSS) that schedules the N bitstreams for decoding each of the units. For each access unit
  • all data associated with an access unit is removed and decoded instantaneously by the instantaneous decoding process at CPB removal time of the access unit.
  • Each decoded picture is placed in the Decoded Picture Buffer (DPB) for being referenced by the decoding process of this stream as well as for output and cropping.
  • A decoded picture is removed from the DPB at the time that it becomes no longer needed for inter-prediction reference as well as the output time of the access unit is the largest of all decoded pictures remaining in the group of N decoders
Then at any point time,
  • each of the individual streams conforms to the signaled profile/level/tier and HRD parameters of the individual stream.
  • The sum of the CPB size conforms to common profile/level/tier signaling
  • The aggregate decoder processing speed (samples per seconds) conforms to common profile/level/tier signaling.
  • The sum of the DPB size conforms to common profile/level/tier signaling
  • The common DPB size conforms to common profile/level/tier signaling
A set of N concurrent decoder instances conforms to a given capabilities (defined in clause 7.1.2.2), if a set of up to N bitstreams encoded to be decodable by the HRD above, is decodable within the timing limits.
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7.1.2.2  Capabilities  p. 20

Based on the definition in clause 7.1.2.1, the following capabilities are defined:
  • AVC-FullHD-Dec-2: The capability of supporting up to two (N=2) concurrent decoder instances with the aggregate capabilities of AVC-FullHD-Dec.
  • AVC-UHD-Dec-4: The capability of supporting up to four (N=4) concurrent decoder instances with the aggregate capabilities of AVC-UHD-Dec.
  • HEVC-UHD-Dec-4: The capability of supporting up to four (N=4) concurrent decoder instances with the aggregate capabilities of HEVC-UHD-Dec.
  • UHD-Dec-4: The capability supporting up to four (N=4) concurrent decoder instances with either:
    • the aggregate capabilities of AVC-UHD-Dec-4;
    • the aggregate capabilities of HEVC-UHD-Dec-4; or,
    • the capability of decoding up to 4 bitstreams for which each bitstream does not exceed the capability of being decodable either with AVC-FullHD-Dec or HEVC-FullHD-Dec.
  • AVC-8K-Dec-8: The capability of supporting up to eight (N=8) concurrent decoder instances with the aggregate capabilities of AVC-8K-Dec.
  • HEVC-8K-Dec-8: The capability of supporting up to eight (N=8) concurrent decoder instances with the aggregate capabilities of HEVC-8K-Dec.
    • 8K-Dec-8: The capability supporting up to eight (N=8) concurrent decoder instances with either:
    • the aggregate capabilities of AVC-8K-Dec-8;
    • the aggregate capabilities of HEVC-8K-Dec-8; or,
    • the capability of decoding up to:
      • eight bitstreams for which each bitstream does not exceed the capability of being decodable either with AVC-FullHD-Dec or HEVC-FullHD-Dec; or,
      • four bitstreams for which each bitstream does not exceed the capability of being decodable either with AVC-UHD-Dec or HEVC-UHD-Dec.
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7.2  Encoding capabilities  p. 21

7.2.1  Single encoder instance  p. 21

The following video encoding capabilities are defined:
  • AVC-FullHD-Enc: the capability to encode a video signal to a bitstream that is decodable by a decoder that is AVC-FullHD-Dec capable as defined in clause 7.1.1 with the following additional constraints:
    • up to 245,760 macroblocks per second;
    • up to a frame size of 8,192 macroblocks;
    • up to 240 frames per second;
    • the chroma format being 4:2:0; and
    • the bit depth being 8 bit;
  • HEVC-FullHD-Enc: the capability to encode a video signal to a bitstream that is decodable by a decoder that is HEVC-FullHD-Dec capable as defined in clause 7.1.1 with the following additional constraints:
    • up to 133,693,440 luma samples per second;
    • up to a luma picture size of 2,228,224 samples;
    • up to 240 frames per second;
    • the Chroma format being 4:2:0; and
    • the bit depth being either 8 or 10 bit;
  • HEVC-UHD-Enc: the capability to encode a video signal to a bitstream that is decodable by a decoder that is HEVC-UHD-Dec capable as defined in clause 7.1.1 with the following additional constraints:
    • up to 534,773,760 luma samples per second;
    • up to a luma picture size of 8,912,896 samples;
    • up to 480 frames per second;
    • the Chroma format being 4:2:0; and
    • the bit depth being either 8 or 10 bit;
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7.3  Capability exchange  p. 21

The capabilities of the device are captured in the data structure defined in clause 12.5.

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