Add test_000134 to help exercise edge cases in IA Sequence Header.

  - Results in a non-trivial IA Sequence header. This should help third parties test "probing" logic.
  - The IAMF spec reserves the right to use these backwards-compatible extensions in the future.

PiperOrigin-RevId: 686141048

iamf/cli/testdata/test_000134.textproto

@@ -0,0 +1,171 @@
+# Copyright (c) 2024, Alliance for Open Media. All rights reserved
+#
+# This source code is subject to the terms of the BSD 3-Clause Clear License
+# and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
+# License was not distributed with this source code in the LICENSE file, you
+# can obtain it at www.aomedia.org/license/software-license/bsd-3-c-c. If the
+# Alliance for Open Media Patent License 1.0 was not distributed with this
+# source code in the PATENTS file, you can obtain it at
+# www.aomedia.org/license/patent.
+
+# proto-file: iamf/cli/proto/user_metadata.proto
+# proto-message: UserMetadata
+
+test_vector_metadata {
+  human_readable_description:
+    "An IAMF stream which is encoding using an `obu_extension_flag` in the IA "
+    "Sequence Header OBU, and with all `leb128`s padded to be 5 bytes long."
+  file_name_prefix: "test_000134"
+  is_valid: true
+  is_valid_to_decode: true
+  validate_user_loudness: true
+  mp4_fixed_timestamp: "2024-10-14 00:00:00"
+  test_repository_tags: [
+    "github/aomediacodec/libiamf/main",
+    "github/aomediacodec/libiamf/v1.0.0-errata"
+  ]
+  primary_tested_spec_sections: [
+    "3.2/obu_extension_flag",
+    "8.1.1/leb128"
+  ]
+  base_test: "test_000002"
+  # All `leb128s` are padded to be 5 bytes long.
+  leb_generator: {
+    mode: GENERATE_LEB_FIXED_SIZE
+    fixed_size: 5
+  }
+}
+
+ia_sequence_header_metadata {
+  primary_profile: PROFILE_VERSION_SIMPLE
+  additional_profile: PROFILE_VERSION_SIMPLE
+  # The profiles signal backwards compatibility; the extension header should be
+  # safely ignored.
+  obu_header: {
+    obu_extension_flag: true
+    extension_header_size: 5
+    extension_header_bytes: "extra"
+  }
+}
+
+codec_config_metadata {
+  codec_config_id: 200
+  codec_config {
+    codec_id: CODEC_ID_LPCM
+    num_samples_per_frame: 64
+    audio_roll_distance: 0
+    decoder_config_lpcm {
+      sample_format_flags: LPCM_LITTLE_ENDIAN
+      sample_size: 16
+      sample_rate: 16000
+    }
+  }
+}
+
+audio_element_metadata {
+  audio_element_id: 300
+  audio_element_type: AUDIO_ELEMENT_CHANNEL_BASED
+  reserved: 0
+  codec_config_id: 200
+  num_substreams: 1
+  audio_substream_ids: [0]
+  num_parameters: 0
+  scalable_channel_layout_config {
+    num_layers: 1
+    reserved: 0
+    channel_audio_layer_configs: [
+      {
+        loudspeaker_layout: LOUDSPEAKER_LAYOUT_STEREO
+        output_gain_is_present_flag: 0
+        recon_gain_is_present_flag: 0
+        reserved_a: 0
+        substream_count: 1
+        coupled_substream_count: 1
+      }
+    ]
+  }
+}
+
+mix_presentation_metadata {
+  mix_presentation_id: 42
+  count_label: 1
+  annotations_language: ["en-us"]
+  localized_presentation_annotations: ["test_mix_pres"]
+  num_sub_mixes: 1
+  sub_mixes {
+    num_audio_elements: 1
+    audio_elements {
+      audio_element_id: 300
+      localized_element_annotations: ["test_sub_mix_0_audio_element_0"]
+      rendering_config {
+        headphones_rendering_mode: HEADPHONES_RENDERING_MODE_STEREO
+      }
+      element_mix_gain {
+        param_definition {
+          parameter_id: 100
+          parameter_rate: 16000
+          param_definition_mode: 1
+          reserved: 0
+        }
+        default_mix_gain: 0
+      }
+    }
+    output_mix_gain {
+      param_definition {
+        parameter_id: 100
+        parameter_rate: 16000
+        param_definition_mode: 1
+        reserved: 0
+      }
+      default_mix_gain: 0
+    }
+    num_layouts: 1
+    layouts {
+      loudness_layout {
+        layout_type: LAYOUT_TYPE_LOUDSPEAKERS_SS_CONVENTION
+        ss_layout {
+          sound_system: SOUND_SYSTEM_A_0_2_0
+          reserved: 0
+        }
+      }
+      loudness {
+        info_type_bit_masks: []
+        integrated_loudness: -13733
+        digital_peak: -12879
+      }
+    }
+  }
+}
+
+audio_frame_metadata {
+  wav_filename: "sawtooth_100_stereo.wav"
+  samples_to_trim_at_end: 0
+  samples_to_trim_at_start: 0
+  audio_element_id: 300
+  channel_ids: [0, 1]
+  channel_labels: ["L2", "R2"]
+}
+
+parameter_block_metadata {
+  parameter_id: 100
+  start_timestamp: 0
+  duration: 8000
+  num_subblocks: 1
+  constant_subblock_duration: 8000
+  subblocks: [
+    {
+      mix_gain_parameter_data {
+        animation_type: ANIMATE_STEP
+        param_data {
+          step {
+            start_point_value: 0
+          }
+        }
+      }
+    }
+  ]
+}
+
+temporal_delimiter_metadata {
+  enable_temporal_delimiters: false
+}

iamf/cli/tests/encoder_main_lib_test.cc

@@ -559,6 +559,9 @@ INSTANTIATE_TEST_SUITE_P(
 INSTANTIATE_TEST_SUITE_P(ParameterBlocksLongerDurationThanAudioFrames,
                          TestVector, testing::Values("test_000133.textproto"));
 
+INSTANTIATE_TEST_SUITE_P(ExtensionsInIaSequenceHeader, TestVector,
+                         testing::Values("test_000134.textproto"));
+
 // ---- Test Set 2 -----
 
 INSTANTIATE_TEST_SUITE_P(BasicMonoLPCM, TestVector,