Case
aiosendspin -> sendspin-go
Start the server first, then the client. The client discovers or looks up the server, initiates the WebSocket connection, negotiates PCM transport, streams audio derived from almost_silent.flac, and compares canonical PCM hashes.
Server
aiosendspin
Client
sendspin-go
Status
Passed
PCM hashes match exactly
Inspection
Summaries, logs, and builds
Matrix result
RAW{
"case_dir": "artifacts/results/data/macos__client-initiated-pcm__aiosendspin__to__sendspin-go",
"client_exit_code": 0,
"client_impl": "sendspin-go",
"reason": "PCM hashes match exactly",
"scenario_id": "client-initiated-pcm",
"server_exit_code": 0,
"server_impl": "aiosendspin",
"status": "passed"
}Server summary (JSON)
RAW{
"audio": {
"bit_depth": 16,
"channels": 1,
"clip_seconds": 5.0,
"duration_seconds": 5.0,
"fixture": "/Users/runner/work/conformance/conformance/repos/sendspin-cli/tests/fixtures/almost_silent.flac",
"frame_alignment_samples": null,
"frame_count": 40000,
"sample_rate": 8000,
"sent_audio_chunk_count": 200,
"sent_codec_header_sha256": null,
"sent_encoded_byte_count": 120000,
"sent_encoded_sha256": "89717d918d5c5c6a80b397c324ba238f09a860d166a105394e17c0df28e91472",
"source_flac_sha256": "8fdda8244e318c63cd8b699fe461cd7cdddbb729327a0ba00d1bfdbe2192fe17",
"source_pcm_sha256": "9d447b5b270bc99b45bb9a616937e436c941ca56c477f9cbe16a93275a6b059e",
"trimmed_source_frames": 0
},
"client": {
"active_roles": [
"player@v1",
"metadata@v1"
],
"client_id": "sendspin-go-client-id",
"name": "sendspin-go-client",
"supported_roles": [
"player@v1",
"metadata@v1"
]
},
"discovery_method": "registry_advertised",
"implementation": "aiosendspin",
"initiator_role": "client",
"peer_hello": {
"payload": {
"client_id": "sendspin-go-client-id",
"device_info": {
"manufacturer": "Sendspin Conformance",
"product_name": "sendspin-go Conformance Client",
"software_version": "0.1.0"
},
"name": "sendspin-go-client",
"player@v1_support": {
"buffer_capacity": 2000000,
"supported_commands": [
"volume",
"mute"
],
"supported_formats": [
{
"bit_depth": 24,
"channels": 1,
"codec": "pcm",
"sample_rate": 8000
},
{
"bit_depth": 16,
"channels": 1,
"codec": "pcm",
"sample_rate": 8000
}
]
},
"supported_roles": [
"player@v1",
"metadata@v1"
],
"version": 1
},
"type": "client/hello"
},
"preferred_codec": "pcm",
"role": "server",
"scenario_id": "client-initiated-pcm",
"server_id": "aiosendspin-server",
"server_name": "aiosendspin server",
"status": "ok",
"stream": {
"bit_depth": 24,
"channels": 1,
"codec": "pcm",
"codec_header": null,
"sample_rate": 8000
}
}Server log
RAWINFO:aiosendspin.server.server:Starting Sendspin server on port 18930
INFO:aiosendspin.server.server:Sendspin server started successfully on 127.0.0.1:18930
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.
{
"audio": {
"bit_depth": 16,
"channels": 1,
"clip_seconds": 5.0,
"duration_seconds": 5.0,
"fixture": "/Users/runner/work/conformance/conformance/repos/sendspin-cli/tests/fixtures/almost_silent.flac",
"frame_alignment_samples": null,
"frame_count": 40000,
"sample_rate": 8000,
"sent_audio_chunk_count": 200,
"sent_codec_header_sha256": null,
"sent_encoded_byte_count": 120000,
"sent_encoded_sha256": "89717d918d5c5c6a80b397c324ba238f09a860d166a105394e17c0df28e91472",
"source_flac_sha256": "8fdda8244e318c63cd8b699fe461cd7cdddbb729327a0ba00d1bfdbe2192fe17",
"source_pcm_sha256": "9d447b5b270bc99b45bb9a616937e436c941ca56c477f9cbe16a93275a6b059e",
"trimmed_source_frames": 0
},
"client": {
"active_roles": [
"player@v1",
"metadata@v1"
],
"client_id": "sendspin-go-client-id",
"name": "sendspin-go-client",
"supported_roles": [
"player@v1",
"metadata@v1"
]
},
"discovery_method": "registry_advertised",
"implementation": "aiosendspin",
"initiator_role": "client",
"peer_hello": {
"payload": {
"client_id": "sendspin-go-client-id",
"device_info": {
"manufacturer": "Sendspin Conformance",
"product_name": "sendspin-go Conformance Client",
"software_version": "0.1.0"
},
"name": "sendspin-go-client",
"player@v1_support": {
"buffer_capacity": 2000000,
"supported_commands": [
"volume",
"mute"
],
"supported_formats": [
{
"bit_depth": 24,
"channels": 1,
"codec": "pcm",
"sample_rate": 8000
},
{
"bit_depth": 16,
"channels": 1,
"codec": "pcm",
"sample_rate": 8000
}
]
},
"supported_roles": [
"player@v1",
"metadata@v1"
],
"version": 1
},
"type": "client/hello"
},
"preferred_codec": "pcm",
"role": "server",
"scenario_id": "client-initiated-pcm",
"server_id": "aiosendspin-server",
"server_name": "aiosendspin server",
"status": "ok",
"stream": {
"bit_depth": 24,
"channels": 1,
"codec": "pcm",
"codec_header": null,
"sample_rate": 8000
}
}
INFO:aiohttp.access:127.0.0.1 [29/Mar/2026:04:41:17 +0000] "GET /sendspin HTTP/1.1" 101 0 "-" "Go-http-client/1.1"
Client summary (JSON)
RAW{
"audio": {
"audio_chunk_count": 200,
"received_encoded_sha256": "89717d918d5c5c6a80b397c324ba238f09a860d166a105394e17c0df28e91472",
"received_pcm_sha256": "9d447b5b270bc99b45bb9a616937e436c941ca56c477f9cbe16a93275a6b059e",
"received_sample_count": 40000
},
"client_id": "sendspin-go-client-id",
"client_name": "sendspin-go-client",
"implementation": "sendspin-go",
"initiator_role": "client",
"peer_hello": {
"active_roles": [
"player@v1"
],
"connection_reason": "playback",
"name": "aiosendspin server",
"server_id": "aiosendspin-server",
"version": 1
},
"preferred_codec": "pcm",
"role": "client",
"scenario_id": "client-initiated-pcm",
"server": {
"active_roles": [
"player@v1"
],
"connection_reason": "playback",
"name": "aiosendspin server",
"server_id": "aiosendspin-server",
"version": 1
},
"status": "ok",
"stream": {
"bit_depth": 24,
"channels": 1,
"codec": "pcm",
"codec_header": "",
"sample_rate": 8000
}
}Client log
RAW2026/03/29 04:41:17.983749 Connecting to ws://127.0.0.1:18930/sendspin
2026/03/29 04:41:17.985077 Sending client/hello:
{
"type": "client/hello",
"payload": {
"client_id": "sendspin-go-client-id",
"name": "sendspin-go-client",
"version": 1,
"supported_roles": [
"player@v1",
"metadata@v1"
],
"device_info": {
"product_name": "sendspin-go Conformance Client",
"manufacturer": "Sendspin Conformance",
"software_version": "0.1.0"
},
"player@v1_support": {
"supported_formats": [
{
"codec": "pcm",
"channels": 1,
"sample_rate": 8000,
"bit_depth": 24
},
{
"codec": "pcm",
"channels": 1,
"sample_rate": 8000,
"bit_depth": 16
}
],
"buffer_capacity": 2000000,
"supported_commands": [
"volume",
"mute"
]
}
}
}
2026/03/29 04:41:17.988792 Handshake complete with server
2026/03/29 04:41:17.989031 Metadata: - ()
2026/03/29 04:41:17.989054 Group update: id=bd8e4af0-53c0-4f5b-abdf-600d798a5366, state=stopped
2026/03/29 04:41:18.063567 Group update: id=bd8e4af0-53c0-4f5b-abdf-600d798a5366, state=playing
2026/03/29 04:41:23.815717 Group update: id=bd8e4af0-53c0-4f5b-abdf-600d798a5366, state=stopped
2026/03/29 04:41:24.318002 Read error: websocket: close 1000 (normal)
2026/03/29 04:41:24.318101 Connection closed
{
"audio": {
"audio_chunk_count": 200,
"received_encoded_sha256": "89717d918d5c5c6a80b397c324ba238f09a860d166a105394e17c0df28e91472",
"received_pcm_sha256": "9d447b5b270bc99b45bb9a616937e436c941ca56c477f9cbe16a93275a6b059e",
"received_sample_count": 40000
},
"client_id": "sendspin-go-client-id",
"client_name": "sendspin-go-client",
"implementation": "sendspin-go",
"initiator_role": "client",
"peer_hello": {
"active_roles": [
"player@v1"
],
"connection_reason": "playback",
"name": "aiosendspin server",
"server_id": "aiosendspin-server",
"version": 1
},
"preferred_codec": "pcm",
"role": "client",
"scenario_id": "client-initiated-pcm",
"server": {
"active_roles": [
"player@v1"
],
"connection_reason": "playback",
"name": "aiosendspin server",
"server_id": "aiosendspin-server",
"version": 1
},
"status": "ok",
"stream": {
"bit_depth": 24,
"channels": 1,
"codec": "pcm",
"codec_header": "",
"sample_rate": 8000
}
}
Server build log · python-adapters · built · 0.04s
RAWListing 'src'... Listing 'src/conformance'... Listing 'src/conformance/adapters'... Compiling 'src/conformance/adapters/__init__.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/merge.py'... Compiling 'src/conformance/registry.py'... Listing 'src/sendspin_conformance.egg-info'... Listing 'scripts'... Compiling 'scripts/merge_results.py'... Compiling 'scripts/run_all.py'... Compiling 'scripts/setup_repositories.py'... Compiling 'scripts/setup_workspace.py'...
Client build log · sendspin-go-client · built · 7.94s
RAWgo: downloading github.com/gorilla/websocket v1.5.3 go: downloading github.com/mewkiz/flac v1.0.13 go: downloading github.com/icza/bitio v1.1.0 go: downloading github.com/mewkiz/pkg v0.0.0-20250417130911-3f050ff8c56d go: downloading github.com/mewpkg/term v0.0.0-20241026122259-37a80af23985