Case
aiosendspin -> aiosendspin
Start the server first, then the client. The server loads the PCM audio derived from almost_silent.flac, the client advertises a listener and FLAC as its only supported audio format, the server connects in, uses the SDK to encode the PCM into FLAC, streams it to the client, and the matrix compares the transported FLAC header and chunk bytes as received by the client. Where the client reports the audio it decoded and the stream kept the source's sample rate and channel count, the matrix also compares its canonical PCM hash against the source clip, so a stream that arrived intact but incomplete fails.
Server
aiosendspin
Client
aiosendspin
Status
Passed
FLAC header and chunk bytes match exactly and the decoded audio matches the source clip
Server activation
Initial server/activate
What the aiosendspin server's own adapter recorded for its first server/activate on this connection, reported as sent. The case fails when none was sent, when its activities are not unique values from playback and pairing, or when it omits active_roles. Nothing else in it is checked against the specification: which activities and roles the matched PSK allows is not judged. A recording that cannot be read as that message is shown whole and not judged either.
Server group state
Every group/update after activation
What the aiosendspin server's own adapter recorded for each group/update it sent after its first server/activate on this connection, in order and reported as sent. The case fails when none followed, or when in any of them playback_state is not playing or stopped, or group_id or group_name is missing or not a string. How soon the first followed is not judged, because the specification says promptly and gives no bound, so one sent at any point in the case counts. Whether a change to a field produced a further message is not judged either. A recording of anything other than that message is shown whole and fails the case as a harness gap.
1 of 3
2 of 3
3 of 3
Inspection
Summaries, logs, and builds
Matrix result
RAW{
"case_dir": "artifacts/results/data/macos__server-initiated-flac__aiosendspin__to__aiosendspin",
"client_exit_code": 0,
"client_impl": "aiosendspin",
"reason": "FLAC header and chunk bytes match exactly and the decoded audio matches the source clip",
"scenario_id": "server-initiated-flac",
"scenario_revision": 6,
"server_exit_code": 0,
"server_impl": "aiosendspin",
"status": "passed",
"unsupported": false
}Server summary (JSON)
RAW{
"activation": {
"payload": {
"active_roles": [
"player@v1"
],
"activities": [
"playback"
]
},
"type": "server/activate"
},
"audio": {
"bit_depth": 16,
"channels": 1,
"clip_seconds": 5.0,
"duration_seconds": 4.968,
"fixture": "/Users/runner/work/conformance/conformance/repos/sendspin-cli/tests/fixtures/almost_silent.flac",
"frame_alignment_samples": 576,
"frame_count": 39744,
"sample_rate": 8000,
"sent_audio_chunk_count": 69,
"sent_codec_header_sha256": "cf785f756a60586c95243e827c384663e8dc4be893f3eb79a5b092b4df511214",
"sent_encoded_byte_count": 3817,
"sent_encoded_sha256": "a4be5550140f2e9d7a631318496eab0f63ca6b09ce6ff0e148b50d0364ffe49a",
"source_flac_sha256": "8fdda8244e318c63cd8b699fe461cd7cdddbb729327a0ba00d1bfdbe2192fe17",
"source_pcm_sha256": "ea4a8f1ced7d3ad85d46da1dea8cf98cd2cf75dbf305fb11cffea11b1e180952",
"trimmed_source_frames": 256
},
"availability_trace": [
{
"available": false,
"type": "client/state"
},
{
"available": true,
"type": "client/state"
},
{
"phase": "sending",
"roles": [
"player"
],
"type": "stream/start"
},
{
"phase": "sent",
"roles": [
"player"
],
"type": "stream/start"
}
],
"client": {
"active_roles": [
"player@v1"
],
"client_id": "rFgILqo5YfPor8oK13GTFmECUaxYcW46Q1TFv8F38Xg",
"name": "aiosendspin-client",
"supported_roles": [
"player@v1"
]
},
"discovery_method": "registry_fallback",
"group_updates": [
{
"payload": {
"group_id": "8a5acf47-0793-4d28-a41d-8a6804ebc340",
"group_name": "aiosendspin-client",
"playback_state": "stopped"
},
"type": "group/update"
},
{
"payload": {
"group_id": "8a5acf47-0793-4d28-a41d-8a6804ebc340",
"group_name": "aiosendspin-client",
"playback_state": "playing"
},
"type": "group/update"
},
{
"payload": {
"group_id": "8a5acf47-0793-4d28-a41d-8a6804ebc340",
"group_name": "aiosendspin-client",
"playback_state": "stopped"
},
"type": "group/update"
}
],
"implementation": "aiosendspin",
"initiator_role": "server",
"peer_hello": {
"payload": {
"name": "aiosendspin-client",
"player@v1_support": {
"buffer_capacity": 2000000,
"supported_formats": [
{
"bit_depth": 16,
"channels": 1,
"codec": "flac",
"sample_rate": 8000
},
{
"bit_depth": 16,
"channels": 2,
"codec": "flac",
"sample_rate": 44100
},
{
"bit_depth": 16,
"channels": 2,
"codec": "flac",
"sample_rate": 48000
}
]
},
"supported_pair_methods": {
"pairing_psk": {}
},
"supported_roles": [
"player@v1"
],
"unpaired_access": {
"enabled": true
}
},
"type": "client/hello"
},
"preferred_codec": "flac",
"role": "server",
"scenario_id": "server-initiated-flac",
"server_id": "dsIlKLOY1OqUfE4ig1m3id0r6yr2D5_3R-FJLQZI30I",
"server_name": "aiosendspin server",
"status": "ok",
"stream": {
"bit_depth": 16,
"channels": 1,
"codec": "flac",
"codec_header": "ZkxhQ4AAACICQAJAAAAAAASVAfQA8AAAAAAAAAAAAAAAAAAAAAAAAAAA",
"codec_header_sha256": "cf785f756a60586c95243e827c384663e8dc4be893f3eb79a5b092b4df511214",
"sample_rate": 8000
},
"time_exchange": [
{
"payload": {
"client_transmitted": 918850886
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 918850886,
"server_received": 918853718,
"server_transmitted": 918854016
},
"type": "server/time"
},
{
"payload": {
"client_transmitted": 919053918
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 919053918,
"server_received": 919054621,
"server_transmitted": 919055121
},
"type": "server/time"
},
{
"type": "other-sent"
},
{
"payload": {
"client_transmitted": 919152622
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 919152622,
"server_received": 919153141,
"server_transmitted": 919154810
},
"type": "server/time"
},
{
"payload": {
"client_transmitted": 919256484
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 919256484,
"server_received": 919256947,
"server_transmitted": 919257254
},
"type": "server/time"
},
{
"payload": {
"client_transmitted": 922260209
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 922260209,
"server_received": 922262307,
"server_transmitted": 922263656
},
"type": "server/time"
},
{
"type": "other-sent"
},
{
"payload": {
"client_transmitted": 925263674
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 925263674,
"server_received": 925264200,
"server_transmitted": 925264459
},
"type": "server/time"
}
]
}Server log
RAWINFO:aiosendspin.server.server:Starting Sendspin server on port 18999
INFO:aiosendspin.server.server:Sendspin server started successfully on 127.0.0.1:18999
WARNING:aiosendspin.server.server:No IP addresses available for mDNS advertising. Clients may not be able to discover this server. Consider specifying addresses manually via advertise_addresses.
{
"activation": {
"payload": {
"active_roles": [
"player@v1"
],
"activities": [
"playback"
]
},
"type": "server/activate"
},
"audio": {
"bit_depth": 16,
"channels": 1,
"clip_seconds": 5.0,
"duration_seconds": 4.968,
"fixture": "/Users/runner/work/conformance/conformance/repos/sendspin-cli/tests/fixtures/almost_silent.flac",
"frame_alignment_samples": 576,
"frame_count": 39744,
"sample_rate": 8000,
"sent_audio_chunk_count": 69,
"sent_codec_header_sha256": "cf785f756a60586c95243e827c384663e8dc4be893f3eb79a5b092b4df511214",
"sent_encoded_byte_count": 3817,
"sent_encoded_sha256": "a4be5550140f2e9d7a631318496eab0f63ca6b09ce6ff0e148b50d0364ffe49a",
"source_flac_sha256": "8fdda8244e318c63cd8b699fe461cd7cdddbb729327a0ba00d1bfdbe2192fe17",
"source_pcm_sha256": "ea4a8f1ced7d3ad85d46da1dea8cf98cd2cf75dbf305fb11cffea11b1e180952",
"trimmed_source_frames": 256
},
"availability_trace": [
{
"available": false,
"type": "client/state"
},
{
"available": true,
"type": "client/state"
},
{
"phase": "sending",
"roles": [
"player"
],
"type": "stream/start"
},
{
"phase": "sent",
"roles": [
"player"
],
"type": "stream/start"
}
],
"client": {
"active_roles": [
"player@v1"
],
"client_id": "rFgILqo5YfPor8oK13GTFmECUaxYcW46Q1TFv8F38Xg",
"name": "aiosendspin-client",
"supported_roles": [
"player@v1"
]
},
"discovery_method": "registry_fallback",
"group_updates": [
{
"payload": {
"group_id": "8a5acf47-0793-4d28-a41d-8a6804ebc340",
"group_name": "aiosendspin-client",
"playback_state": "stopped"
},
"type": "group/update"
},
{
"payload": {
"group_id": "8a5acf47-0793-4d28-a41d-8a6804ebc340",
"group_name": "aiosendspin-client",
"playback_state": "playing"
},
"type": "group/update"
},
{
"payload": {
"group_id": "8a5acf47-0793-4d28-a41d-8a6804ebc340",
"group_name": "aiosendspin-client",
"playback_state": "stopped"
},
"type": "group/update"
}
],
"implementation": "aiosendspin",
"initiator_role": "server",
"peer_hello": {
"payload": {
"name": "aiosendspin-client",
"player@v1_support": {
"buffer_capacity": 2000000,
"supported_formats": [
{
"bit_depth": 16,
"channels": 1,
"codec": "flac",
"sample_rate": 8000
},
{
"bit_depth": 16,
"channels": 2,
"codec": "flac",
"sample_rate": 44100
},
{
"bit_depth": 16,
"channels": 2,
"codec": "flac",
"sample_rate": 48000
}
]
},
"supported_pair_methods": {
"pairing_psk": {}
},
"supported_roles": [
"player@v1"
],
"unpaired_access": {
"enabled": true
}
},
"type": "client/hello"
},
"preferred_codec": "flac",
"role": "server",
"scenario_id": "server-initiated-flac",
"server_id": "dsIlKLOY1OqUfE4ig1m3id0r6yr2D5_3R-FJLQZI30I",
"server_name": "aiosendspin server",
"status": "ok",
"stream": {
"bit_depth": 16,
"channels": 1,
"codec": "flac",
"codec_header": "ZkxhQ4AAACICQAJAAAAAAASVAfQA8AAAAAAAAAAAAAAAAAAAAAAAAAAA",
"codec_header_sha256": "cf785f756a60586c95243e827c384663e8dc4be893f3eb79a5b092b4df511214",
"sample_rate": 8000
},
"time_exchange": [
{
"payload": {
"client_transmitted": 918850886
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 918850886,
"server_received": 918853718,
"server_transmitted": 918854016
},
"type": "server/time"
},
{
"payload": {
"client_transmitted": 919053918
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 919053918,
"server_received": 919054621,
"server_transmitted": 919055121
},
"type": "server/time"
},
{
"type": "other-sent"
},
{
"payload": {
"client_transmitted": 919152622
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 919152622,
"server_received": 919153141,
"server_transmitted": 919154810
},
"type": "server/time"
},
{
"payload": {
"client_transmitted": 919256484
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 919256484,
"server_received": 919256947,
"server_transmitted": 919257254
},
"type": "server/time"
},
{
"payload": {
"client_transmitted": 922260209
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 922260209,
"server_received": 922262307,
"server_transmitted": 922263656
},
"type": "server/time"
},
{
"type": "other-sent"
},
{
"payload": {
"client_transmitted": 925263674
},
"type": "client/time"
},
{
"payload": {
"client_transmitted": 925263674,
"server_received": 925264200,
"server_transmitted": 925264459
},
"type": "server/time"
}
]
}
Client summary (JSON)
RAW{
"audio": {
"audio_chunk_count": 69,
"received_encoded_sha256": "a4be5550140f2e9d7a631318496eab0f63ca6b09ce6ff0e148b50d0364ffe49a",
"received_pcm_sha256": "ea4a8f1ced7d3ad85d46da1dea8cf98cd2cf75dbf305fb11cffea11b1e180952",
"received_sample_count": 39744
},
"client_id": "rFgILqo5YfPor8oK13GTFmECUaxYcW46Q1TFv8F38Xg",
"client_name": "aiosendspin-client",
"implementation": "aiosendspin",
"initiator_role": "server",
"peer_hello": null,
"preferred_codec": "flac",
"role": "client",
"scenario_id": "server-initiated-flac",
"server": null,
"status": "ok",
"stream": {
"bit_depth": 16,
"channels": 1,
"codec": "flac",
"codec_header": "ZkxhQ4AAACICQAJAAAAAAASVAfQA8AAAAAAAAAAAAAAAAAAAAAAAAAAA",
"sample_rate": 8000
}
}Client log
RAWINFO:aiosendspin.client.listener:ClientListener started on port 19999, path /sendspin
INFO:aiosendspin.client.connection:Stream started with codec flac
INFO:aiohttp.access:127.0.0.1 [21/Oct/2026:07:23:55 +0000] "GET /sendspin HTTP/1.1" 101 0 "-" "Python/3.12 aiohttp/3.14.5"
INFO:aiosendspin.client.listener:ClientListener stopped
{
"audio": {
"audio_chunk_count": 69,
"received_encoded_sha256": "a4be5550140f2e9d7a631318496eab0f63ca6b09ce6ff0e148b50d0364ffe49a",
"received_pcm_sha256": "ea4a8f1ced7d3ad85d46da1dea8cf98cd2cf75dbf305fb11cffea11b1e180952",
"received_sample_count": 39744
},
"client_id": "rFgILqo5YfPor8oK13GTFmECUaxYcW46Q1TFv8F38Xg",
"client_name": "aiosendspin-client",
"implementation": "aiosendspin",
"initiator_role": "server",
"peer_hello": null,
"preferred_codec": "flac",
"role": "client",
"scenario_id": "server-initiated-flac",
"server": null,
"status": "ok",
"stream": {
"bit_depth": 16,
"channels": 1,
"codec": "flac",
"codec_header": "ZkxhQ4AAACICQAJAAAAAAASVAfQA8AAAAAAAAAAAAAAAAAAAAAAAAAAA",
"sample_rate": 8000
}
}
Shared build log · python-adapters · built · 0.24s
RAW.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/player/audio_transformers.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/player/capabilities.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/player/events.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/player/group.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/player/types.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/player/v1.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/registry.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/scheduled_state.py'... Listing 'src/conformance/_vendor/aiosendspin/server/roles/source'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/source/__init__.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/source/events.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/source/stream.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/source/v1.py'... Listing 'src/conformance/_vendor/aiosendspin/server/roles/visualizer'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer/__init__.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer/features.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer/group.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer/packing.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer/types.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer/v1.py'... Listing 'src/conformance/_vendor/aiosendspin/server/roles/visualizer_draft_r1'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer_draft_r1/__init__.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer_draft_r1/features.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer_draft_r1/packing.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/roles/visualizer_draft_r1/role.py'... Compiling 'src/conformance/_vendor/aiosendspin/server/server.py'... Compiling 'src/conformance/_vendor/aiosendspin/util.py'... Listing 'src/conformance/adapters'... Compiling 'src/conformance/adapters/__init__.py'... Compiling 'src/conformance/adapters/_aiosendspin_pairing.py'... Compiling 'src/conformance/adapters/_aiosendspin_protocol_evidence.py'... Compiling 'src/conformance/adapters/aiosendspin_client.py'... Compiling 'src/conformance/adapters/aiosendspin_server.py'... Compiling 'src/conformance/adapters/placeholder.py'... Compiling 'src/conformance/cli.py'... Compiling 'src/conformance/flac.py'... Compiling 'src/conformance/merge.py'... Compiling 'src/conformance/pcm.py'... Compiling 'src/conformance/registry.py'... Listing 'src/conformance/validator'... Compiling 'src/conformance/validator/__init__.py'... Compiling 'src/conformance/validator/checks.py'... Compiling 'src/conformance/validator/cli.py'... Compiling 'src/conformance/validator/code_pairing.py'... Compiling 'src/conformance/validator/code_pairing_checks.py'... Compiling 'src/conformance/validator/discovery.py'... Compiling 'src/conformance/validator/findings.py'... Compiling 'src/conformance/validator/noncompliance_refs.py'... Compiling 'src/conformance/validator/prompter.py'... Compiling 'src/conformance/validator/recorder.py'... Compiling 'src/conformance/validator/report.py'... Compiling 'src/conformance/validator/session.py'... Compiling 'src/conformance/validator/storage.py'... Compiling 'src/conformance/validator/suite_checks.py'... Compiling 'src/conformance/validator/suites.py'... Listing 'src/sendspin_conformance.egg-info'... Listing 'scripts'... Compiling 'scripts/detect_regressions.py'... Compiling 'scripts/merge_results.py'... Compiling 'scripts/run_all.py'... Compiling 'scripts/setup_repositories.py'... Compiling 'scripts/setup_workspace.py'... Compiling 'scripts/vendor_aiosendspin.py'...