{
  "about": "platform-decode \u00a72: the query a sink reads from an entry's payload, and \u00a72.3: the chunks it gives the decoder. payload_file names a WAI1 envelope under wai/ whose payload is the entry's; payload_raw a file whose bytes are the payload; sps_hex is an HEVC SPS NAL unit, header included, as an Annex B stream carries it. rate is the presentation rate a sink gives a payload that states none. mutate is a planted fault: [byte offset, bits flipped] edits of the payload before it is read. expect holds members of the query's JSON form (platform_decode::query_json), chunks the summary of its chunks (platform_decode::chunks_json), and refused: true a payload that gives no query or no chunks. The two AV1 objects are floor objects of the packaging corpus (SPEC \u00a75's AV1 framing); their codec string is the one the packager wrote into the pack's HLS master. The SPS is the one the platform's HEVC encoder wrote through WebCodecs, configured as hvc1.1.6.L93.B0 for 640x360 with prefer-hardware (a hint the user agent may ignore, so nothing here says which encoder ran): it states general_level_idc 63 (level 2.1), and the codec string the encoder declared for its output repeated the configured one. The other payloads were written by real encoders and muxers: identify-conformance/ext/ (its tools/make_external.sh), encode-conformance/streams/ (the platform's and a software encoder), and payloads/ (payloads/make.sh; payloads/prober.tsv is what an independent media prober read of each).",
  "cases": [
    {
      "id": "corpus-floor-object-60-units",
      "capability": "wai.video.av1",
      "payload_file": "pack-conformance/packs/video-base-01/package/objects/35c7a45323b7afe979c123fa885f35cc55fabd2a1954759aebe4b95dbc76361f.wai",
      "expect": {
        "codec": "av01.0.00M.08",
        "width": 64,
        "height": 36,
        "codedWidth": 64,
        "codedHeight": 36,
        "framerate": [
          25,
          1
        ],
        "bitrate": 7230,
        "bitDepth": 8
      }
    },
    {
      "id": "corpus-floor-object-40-units",
      "capability": "wai.video.av1",
      "payload_file": "pack-conformance/packs/video-base-01/package/objects/761c4649427c51796a2b699568775765b209ee80d2f4fc1cf040838c6724aa2d.wai",
      "expect": {
        "codec": "av01.0.00M.08",
        "width": 64,
        "height": 36,
        "codedWidth": 64,
        "codedHeight": 36,
        "framerate": [
          25,
          1
        ],
        "bitrate": 8715,
        "bitDepth": 8
      }
    },
    {
      "id": "platform-encoder-sps",
      "capability": "wai.video.hevc",
      "sps_hex": "420101016000000300b0000003000003003fa005020171f2e206ee45914bff2e7f13fa9b8086808040",
      "expect": {
        "codec": "hev1.1.6.L63.B0",
        "width": 640,
        "height": 360,
        "codedWidth": 640,
        "codedHeight": 368,
        "bitDepth": 8
      }
    },
    {
      "id": "vp9-profile-0",
      "capability": "wai.video.vp9",
      "payload_raw": "identify-conformance/ext/vp9.ivf",
      "expect": {
        "media": "video",
        "codec": "vp09.00.10.08",
        "width": 32,
        "height": 32,
        "codedWidth": 32,
        "codedHeight": 32,
        "framerate": [
          10,
          1
        ],
        "bitrate": 21627,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"vp09.00.10.08\"",
            "width": 32,
            "height": 32,
            "bitrate": 21627,
            "framerate": 10.0
          }
        }
      },
      "chunks": {
        "chunks": 3,
        "keys": 1,
        "firstKey": true,
        "bytes": 743,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "vp9-profile-1-444",
      "capability": "wai.video.vp9",
      "payload_raw": "platform-decode-conformance/payloads/vp9-444.ivf",
      "expect": {
        "media": "video",
        "codec": "vp09.01.10.08.03.01.01.01.00",
        "width": 48,
        "height": 32,
        "codedWidth": 48,
        "codedHeight": 32,
        "framerate": [
          30000,
          1001
        ],
        "bitrate": 110983,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"vp09.01.10.08.03.01.01.01.00\"",
            "width": 48,
            "height": 32,
            "bitrate": 110983,
            "framerate": 29.97002997002997
          }
        }
      },
      "chunks": {
        "chunks": 9,
        "keys": 3,
        "firstKey": true,
        "bytes": 4026,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "vp9-profile-2-10-bit-bt2020-full-range",
      "capability": "wai.video.vp9",
      "payload_raw": "platform-decode-conformance/payloads/vp9-10bit.ivf",
      "expect": {
        "media": "video",
        "codec": "vp09.02.10.10.01.01.01.09.01",
        "width": 64,
        "height": 36,
        "codedWidth": 64,
        "codedHeight": 36,
        "framerate": [
          25,
          1
        ],
        "bitrate": 57440,
        "bitDepth": 10,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"vp09.02.10.10.01.01.01.09.01\"",
            "width": 64,
            "height": 36,
            "bitrate": 57440,
            "framerate": 25.0
          }
        }
      },
      "chunks": {
        "chunks": 10,
        "keys": 2,
        "firstKey": true,
        "bytes": 2720,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "vp8",
      "capability": "wai.video.vp8",
      "payload_raw": "platform-decode-conformance/payloads/vp8.ivf",
      "expect": {
        "media": "video",
        "codec": "vp8",
        "width": 64,
        "height": 36,
        "codedWidth": 64,
        "codedHeight": 36,
        "framerate": [
          25,
          1
        ],
        "bitrate": 73220,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"vp8\"",
            "width": 64,
            "height": 36,
            "bitrate": 73220,
            "framerate": 25.0
          }
        }
      },
      "chunks": {
        "chunks": 10,
        "keys": 2,
        "firstKey": true,
        "bytes": 3509,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "avc-constrained-baseline",
      "capability": "wai.video.avc",
      "payload_raw": "identify-conformance/ext/avc.h264",
      "rate": [
        10,
        1
      ],
      "expect": {
        "media": "video",
        "codec": "avc1.42C00A",
        "width": 32,
        "height": 32,
        "codedWidth": 32,
        "codedHeight": 32,
        "framerate": [
          10,
          1
        ],
        "bitrate": 35387,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"avc1.42C00A\"",
            "width": 32,
            "height": 32,
            "bitrate": 35387,
            "framerate": 10.0
          }
        }
      },
      "chunks": {
        "chunks": 3,
        "keys": 1,
        "firstKey": true,
        "bytes": 1327,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "avc-high-b-frames-cropped",
      "capability": "wai.video.avc",
      "payload_raw": "platform-decode-conformance/payloads/avc-high.h264",
      "rate": [
        25,
        1
      ],
      "expect": {
        "media": "video",
        "codec": "avc1.64000A",
        "width": 64,
        "height": 36,
        "codedWidth": 64,
        "codedHeight": 48,
        "framerate": [
          25,
          1
        ],
        "bitrate": 45920,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"avc1.64000A\"",
            "width": 64,
            "height": 36,
            "bitrate": 45920,
            "framerate": 25.0
          }
        }
      },
      "chunks": {
        "chunks": 10,
        "keys": 2,
        "firstKey": true,
        "bytes": 2296,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "avc-platform-encoder",
      "capability": "wai.video.avc",
      "payload_raw": "encode-conformance/streams/platform-avc.h264",
      "rate": [
        30,
        1
      ],
      "expect": {
        "media": "video",
        "codec": "avc1.64000C",
        "width": 256,
        "height": 144,
        "codedWidth": 256,
        "codedHeight": 144,
        "framerate": [
          30,
          1
        ],
        "bitrate": 611260,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"avc1.64000C\"",
            "width": 256,
            "height": 144,
            "bitrate": 611260,
            "framerate": 30.0
          }
        }
      },
      "chunks": {
        "chunks": 12,
        "keys": 3,
        "firstKey": true,
        "bytes": 30563,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "avc-software-encoder-128x72",
      "capability": "wai.video.avc",
      "payload_raw": "encode-conformance/streams/software-avc-128x72.h264",
      "rate": [
        30,
        1
      ],
      "expect": {
        "media": "video",
        "codec": "avc1.640C0C",
        "width": 128,
        "height": 72,
        "codedWidth": 128,
        "codedHeight": 80,
        "framerate": [
          30,
          1
        ],
        "bitrate": 204280,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"avc1.640C0C\"",
            "width": 128,
            "height": 72,
            "bitrate": 204280,
            "framerate": 30.0
          }
        }
      },
      "chunks": {
        "chunks": 12,
        "keys": 3,
        "firstKey": true,
        "bytes": 10214,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "hevc-stream",
      "capability": "wai.video.hevc",
      "payload_raw": "identify-conformance/ext/hevc.h265",
      "rate": [
        10,
        1
      ],
      "expect": {
        "media": "video",
        "codec": "hev1.1.6.L30.90",
        "width": 32,
        "height": 32,
        "codedWidth": 32,
        "codedHeight": 32,
        "framerate": [
          10,
          1
        ],
        "bitrate": 14827,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"hev1.1.6.L30.90\"",
            "width": 32,
            "height": 32,
            "bitrate": 14827,
            "framerate": 10.0
          }
        }
      },
      "chunks": {
        "chunks": 3,
        "keys": 1,
        "firstKey": true,
        "bytes": 556,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "hevc-platform-encoder",
      "capability": "wai.video.hevc",
      "payload_raw": "encode-conformance/streams/platform-hevc.h265",
      "rate": [
        30,
        1
      ],
      "expect": {
        "media": "video",
        "codec": "hev1.1.6.L60.B0",
        "width": 256,
        "height": 144,
        "codedWidth": 256,
        "codedHeight": 144,
        "framerate": [
          30,
          1
        ],
        "bitrate": 632520,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"hev1.1.6.L60.B0\"",
            "width": 256,
            "height": 144,
            "bitrate": 632520,
            "framerate": 30.0
          }
        }
      },
      "chunks": {
        "chunks": 12,
        "keys": 3,
        "firstKey": true,
        "bytes": 31626,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "opus-mono-ogg",
      "capability": "wai.audio.opus",
      "payload_raw": "identify-conformance/ext/opus.ogg",
      "expect": {
        "media": "audio",
        "codec": "opus",
        "sampleRate": 48000,
        "numberOfChannels": 1,
        "bitrate": 40280,
        "bitDepth": null,
        "description": "4f707573486561640101380180bb0000000000",
        "decodingConfiguration": {
          "type": "media-source",
          "audio": {
            "contentType": "audio/mp4; codecs=\"opus\"",
            "channels": "1",
            "samplerate": 48000,
            "bitrate": 40280
          }
        },
        "decoderConfig": {
          "codec": "opus",
          "sampleRate": 48000,
          "numberOfChannels": 1
        }
      },
      "chunks": {
        "chunks": 11,
        "keys": 11,
        "firstKey": true,
        "bytes": 848,
        "samples": 10560,
        "descriptionBytes": 19
      }
    },
    {
      "id": "opus-stereo-ogg",
      "capability": "wai.audio.opus",
      "payload_raw": "platform-decode-conformance/payloads/opus-stereo.ogg",
      "expect": {
        "media": "audio",
        "codec": "opus",
        "sampleRate": 48000,
        "numberOfChannels": 2,
        "bitrate": 75712,
        "bitDepth": null,
        "description": "4f707573486561640102380180bb0000000000",
        "decodingConfiguration": {
          "type": "media-source",
          "audio": {
            "contentType": "audio/mp4; codecs=\"opus\"",
            "channels": "2",
            "samplerate": 48000,
            "bitrate": 75712
          }
        },
        "decoderConfig": {
          "codec": "opus",
          "sampleRate": 48000,
          "numberOfChannels": 2
        }
      },
      "chunks": {
        "chunks": 13,
        "keys": 13,
        "firstKey": true,
        "bytes": 2205,
        "samples": 12480,
        "descriptionBytes": 19
      }
    },
    {
      "id": "opus-one-packet",
      "capability": "wai.audio.opus.packet",
      "payload_raw": "platform-decode-conformance/payloads/opus-packet.opus",
      "expect": {
        "media": "audio",
        "codec": "opus",
        "sampleRate": 48000,
        "numberOfChannels": 2,
        "bitrate": 94400,
        "bitDepth": null,
        "description": null,
        "decodingConfiguration": {
          "type": "media-source",
          "audio": {
            "contentType": "audio/mp4; codecs=\"opus\"",
            "channels": "2",
            "samplerate": 48000,
            "bitrate": 94400
          }
        },
        "decoderConfig": {
          "codec": "opus",
          "sampleRate": 48000,
          "numberOfChannels": 2
        }
      },
      "chunks": {
        "chunks": 1,
        "keys": 1,
        "firstKey": true,
        "bytes": 236,
        "samples": 960,
        "descriptionBytes": null
      }
    },
    {
      "id": "flac-mono-16-bit",
      "capability": "wai.audio.flac",
      "payload_raw": "identify-conformance/ext/a.flac",
      "expect": {
        "media": "audio",
        "codec": "flac",
        "sampleRate": 48000,
        "numberOfChannels": 1,
        "bitrate": 468040,
        "bitDepth": 16,
        "decodingConfiguration": {
          "type": "media-source",
          "audio": {
            "contentType": "audio/mp4; codecs=\"flac\"",
            "channels": "1",
            "samplerate": 48000,
            "bitrate": 468040
          }
        },
        "decoderConfig": {
          "codec": "flac",
          "sampleRate": 48000,
          "numberOfChannels": 1
        }
      },
      "chunks": {
        "chunks": 10,
        "keys": 10,
        "firstKey": true,
        "bytes": 3445,
        "samples": 9600,
        "descriptionBytes": 8256
      }
    },
    {
      "id": "flac-stereo-24-bit",
      "capability": "wai.audio.flac",
      "payload_raw": "platform-decode-conformance/payloads/flac-stereo-24.flac",
      "expect": {
        "media": "audio",
        "codec": "flac",
        "sampleRate": 44100,
        "numberOfChannels": 2,
        "bitrate": 540096,
        "bitDepth": 24,
        "decodingConfiguration": {
          "type": "media-source",
          "audio": {
            "contentType": "audio/mp4; codecs=\"flac\"",
            "channels": "2",
            "samplerate": 44100,
            "bitrate": 540096
          }
        },
        "decoderConfig": {
          "codec": "flac",
          "sampleRate": 44100,
          "numberOfChannels": 2
        }
      },
      "chunks": {
        "chunks": 11,
        "keys": 11,
        "firstKey": true,
        "bytes": 8622,
        "samples": 11025,
        "descriptionBytes": 8256
      }
    },
    {
      "id": "aac-lc-mono",
      "capability": "wai.audio.aac",
      "payload_raw": "identify-conformance/ext/a.aac",
      "expect": {
        "media": "audio",
        "codec": "mp4a.40.2",
        "sampleRate": 48000,
        "numberOfChannels": 1,
        "bitrate": 34364,
        "bitDepth": null,
        "description": null,
        "decodingConfiguration": {
          "type": "media-source",
          "audio": {
            "contentType": "audio/mp4; codecs=\"mp4a.40.2\"",
            "channels": "1",
            "samplerate": 48000,
            "bitrate": 34364
          }
        },
        "decoderConfig": {
          "codec": "mp4a.40.2",
          "sampleRate": 48000,
          "numberOfChannels": 1
        }
      },
      "chunks": {
        "chunks": 11,
        "keys": 11,
        "firstKey": true,
        "bytes": 1008,
        "samples": 11264,
        "descriptionBytes": null
      }
    },
    {
      "id": "aac-lc-stereo",
      "capability": "wai.audio.aac",
      "payload_raw": "platform-decode-conformance/payloads/aac-stereo.aac",
      "expect": {
        "media": "audio",
        "codec": "mp4a.40.2",
        "sampleRate": 44100,
        "numberOfChannels": 2,
        "bitrate": 63710,
        "bitDepth": null,
        "description": null,
        "decodingConfiguration": {
          "type": "media-source",
          "audio": {
            "contentType": "audio/mp4; codecs=\"mp4a.40.2\"",
            "channels": "2",
            "samplerate": 44100,
            "bitrate": 63710
          }
        },
        "decoderConfig": {
          "codec": "mp4a.40.2",
          "sampleRate": 44100,
          "numberOfChannels": 2
        }
      },
      "chunks": {
        "chunks": 12,
        "keys": 12,
        "firstKey": true,
        "bytes": 2219,
        "samples": 12288,
        "descriptionBytes": null
      }
    },
    {
      "id": "vp9-fourcc-changed",
      "capability": "wai.video.vp9",
      "payload_raw": "identify-conformance/ext/vp9.ivf",
      "mutate": [
        [
          11,
          1
        ]
      ],
      "refused": true,
      "why": "IVF FourCC"
    },
    {
      "id": "vp9-first-frame-not-key",
      "capability": "wai.video.vp9",
      "payload_raw": "identify-conformance/ext/vp9.ivf",
      "mutate": [
        [
          44,
          4
        ]
      ],
      "refused": true,
      "why": "the first frame is not a key frame"
    },
    {
      "id": "vp9-profile-bit-changed",
      "capability": "wai.video.vp9",
      "payload_raw": "identify-conformance/ext/vp9.ivf",
      "mutate": [
        [
          44,
          32
        ]
      ],
      "expect": {
        "media": "video",
        "codec": "vp09.01.11.08.03.01.01.01.00",
        "width": 249,
        "height": 252,
        "codedWidth": 249,
        "codedHeight": 252,
        "framerate": [
          10,
          1
        ],
        "bitrate": 21627,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"vp09.01.11.08.03.01.01.01.00\"",
            "width": 249,
            "height": 252,
            "bitrate": 21627,
            "framerate": 10.0
          }
        }
      },
      "chunks": {
        "chunks": 3,
        "keys": 1,
        "firstKey": true,
        "bytes": 743,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "vp8-version-past-3",
      "capability": "wai.video.vp8",
      "payload_raw": "platform-decode-conformance/payloads/vp8.ivf",
      "mutate": [
        [
          44,
          8
        ]
      ],
      "refused": true,
      "why": "a VP8 version past 3"
    },
    {
      "id": "avc-level-byte-changed",
      "capability": "wai.video.avc",
      "payload_raw": "identify-conformance/ext/avc.h264",
      "rate": [
        10,
        1
      ],
      "mutate": [
        [
          7,
          1
        ]
      ],
      "expect": {
        "media": "video",
        "codec": "avc1.42C00B",
        "width": 32,
        "height": 32,
        "codedWidth": 32,
        "codedHeight": 32,
        "framerate": [
          10,
          1
        ],
        "bitrate": 35387,
        "bitDepth": 8,
        "decodingConfiguration": {
          "type": "media-source",
          "video": {
            "contentType": "video/mp4; codecs=\"avc1.42C00B\"",
            "width": 32,
            "height": 32,
            "bitrate": 35387,
            "framerate": 10.0
          }
        }
      },
      "chunks": {
        "chunks": 3,
        "keys": 1,
        "firstKey": true,
        "bytes": 1327,
        "samples": null,
        "descriptionBytes": null
      }
    },
    {
      "id": "opus-ogg-page-byte-changed",
      "capability": "wai.audio.opus",
      "payload_raw": "identify-conformance/ext/opus.ogg",
      "mutate": [
        [
          30,
          1
        ]
      ],
      "refused": true,
      "why": "an Ogg CRC"
    },
    {
      "id": "flac-frame-byte-changed",
      "capability": "wai.audio.flac",
      "payload_raw": "identify-conformance/ext/a.flac",
      "mutate": [
        [
          9000,
          1
        ]
      ],
      "refused": true,
      "why": "a frame whose CRC-16 never matches"
    },
    {
      "id": "flac-streaminfo-rate-changed",
      "capability": "wai.audio.flac",
      "payload_raw": "identify-conformance/ext/a.flac",
      "mutate": [
        [
          19,
          16
        ]
      ],
      "expect": {
        "media": "audio",
        "codec": "flac",
        "sampleRate": 47744,
        "numberOfChannels": 1,
        "bitrate": 465544,
        "bitDepth": 16,
        "decodingConfiguration": {
          "type": "media-source",
          "audio": {
            "contentType": "audio/mp4; codecs=\"flac\"",
            "channels": "1",
            "samplerate": 47744,
            "bitrate": 465544
          }
        },
        "decoderConfig": {
          "codec": "flac",
          "sampleRate": 47744,
          "numberOfChannels": 1
        }
      },
      "chunks": {
        "chunks": 10,
        "keys": 10,
        "firstKey": true,
        "bytes": 3445,
        "samples": 9600,
        "descriptionBytes": 8256
      }
    },
    {
      "id": "aac-channel-configuration-0",
      "capability": "wai.audio.aac",
      "payload_raw": "identify-conformance/ext/a.aac",
      "mutate": [
        [
          3,
          64
        ]
      ],
      "refused": true,
      "why": "an ADTS configuration"
    },
    {
      "id": "aac-first-frame-another-rate",
      "capability": "wai.audio.aac",
      "payload_raw": "identify-conformance/ext/a.aac",
      "mutate": [
        [
          2,
          4
        ]
      ],
      "refused": true,
      "why": "another configuration"
    }
  ]
}