Add audio module: meeting minutes with Spring AI speech-to-text, structured output and text-to-speech

OpenAiAudioTranscriptionModel -> ChatClient.entity(Minutes.class) -> OpenAiAudioSpeechModel, WAV chunking at a silence under the 25 MB upload limit, SDK retry behaviour, the 4096-character speech limit and a cost model. Audio endpoints are a local mock and the chat model a stub; no real model was called. Spring Boot 4.1.2, Spring AI 2.0.2, Java 25. Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01CifR2BE7PBvRy5hT8TS9oz
2026-10-26 02:00:28 +00:00
parent ff58ff0189
commit 279be7eb9f
36 changed files with 1576 additions and 0 deletions
@@ -0,0 +1,14 @@
+# Cost of one meeting, USD (prices of 2026-10-26; word and token counts are ASSUMPTIONS)
+
+assumptions: 150 words/minute spoken, 0.75 words/token, summary output 600 tokens, read-back 120 words
+prices      : gpt-transcribe $0.0045/min | whisper-1 $0.006/min | gpt-4o-mini $0.15 in / $0.60 out per 1M | tts-1 $15 per 1M chars
+
+ minutes       words  gpt-transc   whisper-1     summary       tts-1   total(gt)
+      15       2,250      0.0675      0.0900      0.0008      0.0108      0.0791
+      30       4,500      0.1350      0.1800      0.0013      0.0108      0.1471
+      60       9,000      0.2700      0.3600      0.0022      0.0108      0.2830
+     120      18,000      0.5400      0.7200      0.0040      0.0108      0.5548
+
+transcription is billed on audio duration, not file size: a 60-minute recording costs $0.2700 whatever its encoding.
+size of 60 minutes: 16 kHz mono 16-bit WAV = 115.2 MB | 64 kbit/s mp3 = 28.8 MB | 32 kbit/s mp3 = 14.4 MB
+minutes that fit in 25,000,000 bytes: WAV 13.0 | 64 kbit/s 52 | 32 kbit/s 104