{ "openapi": "3.1.1", "info": { "title": "Room Reverb for WAV Files API", "version": "1.0.0", "summary": "Add room, hall, cathedral or cave reverb to a WAV file with a known reverberation time.", "description": "Every endpoint performs the same calculation as the human page and returns inputs, result, units, assumptions, sources, warnings and computedAt. MCP endpoint: /mcp." }, "servers": [ { "url": "https://soundscapereverb.usefulweb.app" } ], "paths": { "/api/v1/calculate": { "post": { "operationId": "calculate", "summary": "Add room, hall, cathedral or cave reverb to a WAV file with a known reverberation time.", "description": "Applies a Freeverb-style stereo reverb with room presets (small room, living room, studio, concert hall, cathedral, cave, open forest) to an audio file. The reverberation time (RT60) is set exactly per preset or by you and measured on the impulse response; the reverb tail is kept by default.\n\nMethodology:\n- Freeverb structure (Jezar, public domain): per channel eight parallel comb filters with a low-pass in the feedback loop (damping) followed by four series all-pass filters; the right channel’s delays are 23 samples longer for a wide stereo image. Delay lengths are scaled to the sample rate.\n- Unlike the original “room size” knob, each comb’s feedback gain is computed from the reverberation time: g = 10^(−3·delay / (sample rate × RT60)), so every comb decays by 60 dB in RT60 seconds at low and middle frequencies; damping makes high frequencies die away sooner, as in real rooms.\n- The RT60 is verified by measuring the reverb’s impulse response with Schroeder backward integration (T20: the −5 to −25 dB part of the decay, extrapolated to −60 dB).\n- Mono input becomes stereo. With “keep the tail” the file is extended by about 1.2 × RT60 plus the pre-delay so the reverb can fade out. If long reverbs on sustained sounds build up above full scale, the whole result is turned down to a −1 dBFS peak instead of clipping (reported as gain reduction).\n\nRoom presets give typical reverberation times for such spaces; they do not simulate a specific real room’s geometry or early reflections.", "tags": [ "apps" ], "x-mcp-tool": "soundscape_reverb", "x-owner-app": "soundscape", "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/SoundscapeReverbInput" }, "examples": { "example1": { "summary": "Clap in a concert hall", "value": { "file": { "filename": "clap.wav", "contentType": "audio/wav", "contentBase64": 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}, "preset": "hall", "keepTail": true } }, "example2": { "summary": "Two tones in a cathedral with only the reverb (dry 0)", "value": { "file": { "filename": "two-tones.wav", "contentType": "audio/wav", "contentBase64": 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" }, "preset": "cathedral", "rt60": 3, "dry": 0, "wet": 0.25 } } } } } }, "responses": { "200": { "description": "Calculation result envelope.", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/SoundscapeReverbResult" } } } }, "400": { "description": "Malformed JSON body.", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "422": { "description": "Invalid input (see errors[]).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "429": { "description": "Rate limit exceeded (see Retry-After).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } } } } }, "/api/v1/tool": { "get": { "operationId": "getToolDefinition", "summary": "Inputs, output schema and examples for this tool", "responses": { "200": { "description": "Tool definition.", "content": { "application/json": { "schema": { "type": "object" } } } } } } } }, "components": { "schemas": { "Problem": { "type": "object", "description": "RFC 9457 problem details. 422 responses include per-field `errors`.", "required": [ "type", "title", "status", "detail" ], "properties": { "type": { "type": "string" }, "title": { "type": "string" }, "status": { "type": "integer" }, "detail": { "type": "string" }, "code": { "type": "string" }, "errors": { "type": "array", "items": { "type": "object", "required": [ "field", "message" ], "properties": { "field": { "type": "string" }, "message": { "type": "string" } } } } } }, "SoundscapeReverbInput": { "type": "object", "additionalProperties": false, "properties": { "file": { "title": "Audio file", "description": "WAV directly, other formats are decoded with ffmpeg; up to 120 seconds, 8–96 kHz. The WAV file is kept on the server for about 2 hours so you can download it, then deleted. Upload as {filename, contentType?, contentBase64}. Max 51200 KiB. Accepts .wav,.mp3,.flac,.ogg,.oga,.opus,.m4a,.aac,.aif,.aiff,audio/*.", "type": "object", "additionalProperties": false, "required": [ "filename", "contentBase64" ], "properties": { "filename": { "type": "string" }, "contentType": { "type": "string" }, "contentBase64": { "type": "string" } } }, "preset": { "title": "Room", "type": "string", "enum": [ "small-room", "living-room", "studio", "hall", "cathedral", "cave", "forest" ], "default": "hall" }, "rt60": { "title": "Reverberation time (optional)", "description": "Empty = the preset value. Time for the reverb to fall by 60 dB.", "type": "number", "minimum": 0.1, "maximum": 12, "x-unit": "s" }, "wet": { "title": "Reverb level (optional, 0–1)", "description": "Empty = the preset value.", "type": "number", "minimum": 0, "maximum": 1 }, "dry": { "title": "Original level (optional, 0–1)", "description": "Empty = the preset value; 0 gives only the reverb.", "type": "number", "minimum": 0, "maximum": 1 }, "keepTail": { "title": "Keep the reverb tail (the file gets longer)", "type": "boolean", "default": true }, "encoding": { "title": "File format", "type": "string", "enum": [ "auto", "pcm16", "float32" ], "default": "auto" } }, "required": [ "file" ] }, "SoundscapeReverbResult": { "type": "object", "additionalProperties": false, "required": [ "schemaVersion", "tool", "computedAt", "inputs", "summary", "result", "units", "assumptions", "sources", "warnings", "presentation", "links" ], "properties": { "schemaVersion": { "type": "string", "const": "1.0" }, "tool": { "type": "object", "additionalProperties": false, "required": [ "id", "name", "version" ], "properties": { "id": { "type": "string" }, "name": { "type": "string" }, "version": { "type": "string" } } }, "computedAt": { "type": "string", "format": "date-time" }, "inputs": { "type": "object", "description": "Normalised inputs actually used, including applied defaults." }, "summary": { "type": "string" }, "result": { "type": "object", "additionalProperties": false, "required": [ "preset", "parameters", "measuredRt60Seconds", "gainReductionDb", "inputSeconds", "outputSeconds", "tailSeconds", "sampleRate", "channelsIn", "decodedBy", "before", "after", "artifact" ], "properties": { "preset": { "type": "string" }, "parameters": { "type": "object", "additionalProperties": false, "required": [ "rt60", "damping", "wet", "dry", "width", "preDelayMs" ], "properties": { "rt60": { "type": "number" }, "damping": { "type": "number" }, "wet": { "type": "number" }, "dry": { "type": "number" }, "width": { "type": "number" }, "preDelayMs": { "type": "number" } } }, "measuredRt60Seconds": { "type": "number", "description": "RT60 measured on the impulse response (Schroeder integration, T20, low/mid frequencies)." }, "gainReductionDb": { "type": "number", "description": "How much the whole result was turned down to avoid clipping (0 = not needed)." }, "inputSeconds": { "type": "number" }, "outputSeconds": { "type": "number" }, "tailSeconds": { "type": "number" }, "sampleRate": { "type": "integer" }, "channelsIn": { "type": "integer" }, "decodedBy": { "type": "string", "enum": [ "engine", "ffmpeg" ] }, "before": { "type": "object", "additionalProperties": false, "required": [ "rmsDb", "peakDb", "centroidHz" ], "properties": { "rmsDb": { "type": "number" }, "peakDb": { "type": "number" }, "centroidHz": { "type": "number" } } }, "after": { "type": "object", "additionalProperties": false, "required": [ "rmsDb", "peakDb", "centroidHz" ], "properties": { "rmsDb": { "type": "number" }, "peakDb": { "type": "number" }, "centroidHz": { "type": "number" } } }, "artifact": { "type": "object", "additionalProperties": false, "required": [ "artifactId", "filename", "mime", "bytes", "sha256", "path" ], "properties": { "artifactId": { "type": "string" }, "filename": { "type": "string" }, "mime": { "type": "string" }, "bytes": { "type": "integer" }, "sha256": { "type": "string" }, "path": { "type": "string", "description": "Download path on the same site (valid for about 2 hours)." } } } } }, "units": { "type": "object", "additionalProperties": { "type": "string" } }, "assumptions": { "type": "array", "items": { "type": "string" } }, "sources": { "type": "array", "items": { "type": "object", "additionalProperties": false, "required": [ "title" ], "properties": { "title": { "type": "string" }, "url": { "type": "string" }, "publisher": { "type": "string" }, "retrievedAt": { "type": "string" }, "note": { "type": "string" } } } }, "warnings": { "type": "array", "items": { "type": "string" } }, "presentation": { "type": "array", "items": { "type": "object" }, "description": "Display blocks used by the human page (same data)." }, "links": { "type": "object", "additionalProperties": false, "required": [ "human", "api", "openapi", "methodology" ], "properties": { "human": { "type": "string", "format": "uri" }, "api": { "type": "string", "format": "uri" }, "openapi": { "type": "string", "format": "uri" }, "methodology": { "type": "string", "format": "uri" } } } } } } } }