Case
aiosendspin -> sendspin-cpp
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-cpp
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-cpp",
"client_exit_code": 0,
"client_impl": "sendspin-cpp",
"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": 80000,
"sent_encoded_sha256": "b3481a3f75dea856a961e7842d12f8344c7147b3925f9f0b67c5445700bd4cf2",
"source_flac_sha256": "8fdda8244e318c63cd8b699fe461cd7cdddbb729327a0ba00d1bfdbe2192fe17",
"source_pcm_sha256": "9d447b5b270bc99b45bb9a616937e436c941ca56c477f9cbe16a93275a6b059e",
"trimmed_source_frames": 0
},
"client": {
"active_roles": [
"player@v1"
],
"client_id": "sendspin-cpp-client-id",
"name": "sendspin-cpp-client",
"supported_roles": [
"player@v1"
]
},
"discovery_method": "registry_advertised",
"implementation": "aiosendspin",
"initiator_role": "client",
"peer_hello": {
"payload": {
"client_id": "sendspin-cpp-client-id",
"device_info": {
"manufacturer": "Sendspin Conformance",
"product_name": "sendspin-cpp Conformance Client",
"software_version": "0.1.0"
},
"name": "sendspin-cpp-client",
"player@v1_support": {
"buffer_capacity": 800000,
"supported_commands": [
"volume",
"mute"
],
"supported_formats": [
{
"bit_depth": 16,
"channels": 1,
"codec": "pcm",
"sample_rate": 8000
}
]
},
"supported_roles": [
"player@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": 16,
"channels": 1,
"codec": "pcm",
"codec_header": null,
"sample_rate": 8000
}
}Server log
RAWINFO:aiosendspin.server.server:Starting Sendspin server on port 18928
INFO:aiosendspin.server.server:Sendspin server started successfully on 127.0.0.1:18928
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": 80000,
"sent_encoded_sha256": "b3481a3f75dea856a961e7842d12f8344c7147b3925f9f0b67c5445700bd4cf2",
"source_flac_sha256": "8fdda8244e318c63cd8b699fe461cd7cdddbb729327a0ba00d1bfdbe2192fe17",
"source_pcm_sha256": "9d447b5b270bc99b45bb9a616937e436c941ca56c477f9cbe16a93275a6b059e",
"trimmed_source_frames": 0
},
"client": {
"active_roles": [
"player@v1"
],
"client_id": "sendspin-cpp-client-id",
"name": "sendspin-cpp-client",
"supported_roles": [
"player@v1"
]
},
"discovery_method": "registry_advertised",
"implementation": "aiosendspin",
"initiator_role": "client",
"peer_hello": {
"payload": {
"client_id": "sendspin-cpp-client-id",
"device_info": {
"manufacturer": "Sendspin Conformance",
"product_name": "sendspin-cpp Conformance Client",
"software_version": "0.1.0"
},
"name": "sendspin-cpp-client",
"player@v1_support": {
"buffer_capacity": 800000,
"supported_commands": [
"volume",
"mute"
],
"supported_formats": [
{
"bit_depth": 16,
"channels": 1,
"codec": "pcm",
"sample_rate": 8000
}
]
},
"supported_roles": [
"player@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": 16,
"channels": 1,
"codec": "pcm",
"codec_header": null,
"sample_rate": 8000
}
}
INFO:aiohttp.access:127.0.0.1 [29/Mar/2026:04:41:10 +0000] "GET /sendspin HTTP/1.1" 101 0 "-" "ixwebsocket/11.4.4 macos nossl"
Client summary (JSON)
RAW{
"audio": {
"audio_chunk_count": 200,
"received_encoded_sha256": "b3481a3f75dea856a961e7842d12f8344c7147b3925f9f0b67c5445700bd4cf2",
"received_pcm_sha256": "9d447b5b270bc99b45bb9a616937e436c941ca56c477f9cbe16a93275a6b059e",
"received_sample_count": 40000
},
"client_id": "sendspin-cpp-client-id",
"client_name": "sendspin-cpp-client",
"implementation": "sendspin-cpp",
"initiator_role": "client",
"preferred_codec": "pcm",
"reason": null,
"role": "client",
"scenario_id": "client-initiated-pcm",
"server": {
"connection_reason": "discovery",
"name": "aiosendspin server",
"server_id": "aiosendspin-server",
"version": 1
},
"status": "ok",
"stream": {
"bit_depth": 16,
"channels": 1,
"codec": "pcm",
"codec_header": null,
"sample_rate": 8000
}
}Client log
RAWI sendspin.client: Initializing sync task (buffer: 1000000 bytes, formats: 1)
I sendspin.conn_mgr: Initiating client connection to: ws://127.0.0.1:18928/sendspin
I sendspin.conn_mgr: Connection handshake complete: server_id=aiosendspin-server, connection_reason=discovery
I sendspin_sync_task: Processed new codec header
I sendspin.conn_mgr: Current connection lost
{"status":"ok","reason":null,"implementation":"sendspin-cpp","role":"client","scenario_id":"client-initiated-pcm","initiator_role":"client","preferred_codec":"pcm","client_name":"sendspin-cpp-client","client_id":"sendspin-cpp-client-id","server":{"server_id":"aiosendspin-server","name":"aiosendspin server","version":1,"connection_reason":"discovery"},"stream":{"codec":"pcm","sample_rate":8000,"channels":1,"bit_depth":16,"codec_header":null},"audio":{"audio_chunk_count":200,"received_encoded_sha256":"b3481a3f75dea856a961e7842d12f8344c7147b3925f9f0b67c5445700bd4cf2","received_pcm_sha256":"9d447b5b270bc99b45bb9a616937e436c941ca56c477f9cbe16a93275a6b059e","received_sample_count":40000}}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-cpp-client · built · 63.34s
RAW/IXWebSocketPerMessageDeflateCodec.cpp:194:60: warning: unused parameter 'clientNoContextTakeOver' [-Wunused-parameter]
194 | bool clientNoContextTakeOver)
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.cpp:209:80: warning: unused parameter 'in' [-Wunused-parameter]
209 | bool WebSocketPerMessageDeflateDecompressor::decompress(const std::string& in, std::string& out)
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.cpp:209:97: warning: unused parameter 'out' [-Wunused-parameter]
209 | bool WebSocketPerMessageDeflateDecompressor::decompress(const std::string& in, std::string& out)
| ^
In file included from /Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.cpp:7:
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.h:39:13: warning: private field '_flush' is not used [-Wunused-private-field]
39 | int _flush;
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.h:40:44: warning: private field '_compressBuffer' is not used [-Wunused-private-field]
40 | std::array<unsigned char, 1 << 14> _compressBuffer;
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.h:57:13: warning: private field '_flush' is not used [-Wunused-private-field]
57 | int _flush;
| ^
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateCodec.h:58:44: warning: private field '_compressBuffer' is not used [-Wunused-private-field]
58 | std::array<unsigned char, 1 << 14> _compressBuffer;
| ^
12 warnings generated.
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateOptions.cpp:17:26: warning: unused variable 'minServerMaxWindowBits' [-Wunused-const-variable]
17 | static const uint8_t minServerMaxWindowBits = 8;
| ^~~~~~~~~~~~~~~~~~~~~~
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateOptions.cpp:18:26: warning: unused variable 'maxServerMaxWindowBits' [-Wunused-const-variable]
18 | static const uint8_t maxServerMaxWindowBits = 15;
| ^~~~~~~~~~~~~~~~~~~~~~
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateOptions.cpp:21:26: warning: unused variable 'minClientMaxWindowBits' [-Wunused-const-variable]
21 | static const uint8_t minClientMaxWindowBits = 8;
| ^~~~~~~~~~~~~~~~~~~~~~
/Users/runner/work/conformance/conformance/adapters/sendspin-cpp/client/build/_deps/ixwebsocket-src/ixwebsocket/IXWebSocketPerMessageDeflateOptions.cpp:22:26: warning: unused variable 'maxClientMaxWindowBits' [-Wunused-const-variable]
22 | static const uint8_t maxClientMaxWindowBits = 15;
| ^~~~~~~~~~~~~~~~~~~~~~
4 warnings generated.