feat: 添加 Xiaomi MiMo ASR 语音识别提供者
- 新增 MiMoService 实现 stt.Service 接口，通过 HTTP POST 调用 OpenAI 兼容的 /chat/completions 接口 - 自动将原始 PCM 数据封装为 WAV 格式（MiMo 仅支持 mp3/wav） - 语言代码映射：zh-CN→zh、en-US→en、其他→auto - main.go 添加 provider 选择逻辑（mimo/xiaomi → MiMo，其他 → Deepgram） - 更新 config.yaml 使用正确的 model 名称 mimo-v2.5-asr - 添加完整单元测试
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255
backend/internal/ai/stt/mimo_test.go
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255
backend/internal/ai/stt/mimo_test.go
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package stt
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import (
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"context"
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"encoding/base64"
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"encoding/json"
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"io"
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"net/http"
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"net/http/httptest"
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"testing"
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"go.uber.org/zap"
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)
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func newTestMiMoService(handler http.HandlerFunc) (*MiMoService, *httptest.Server) {
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srv := httptest.NewServer(handler)
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s := NewMiMoService("test-key", "mimo-v2.5-asr", srv.URL, zap.NewNop().Sugar())
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return s, srv
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}
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func TestMiMoService_Recognize_Success(t *testing.T) {
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s, srv := newTestMiMoService(func(w http.ResponseWriter, r *http.Request) {
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// 验证请求
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if r.Header.Get("api-key") != "test-key" {
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t.Errorf("expected api-key test-key, got %s", r.Header.Get("api-key"))
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}
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if r.URL.Path != "/chat/completions" {
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t.Errorf("expected path /chat/completions, got %s", r.URL.Path)
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}
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var req mimoRequest
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body, _ := io.ReadAll(r.Body)
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if err := json.Unmarshal(body, &req); err != nil {
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t.Fatalf("unmarshal request: %v", err)
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}
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if req.Model != "mimo-v2.5-asr" {
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t.Errorf("expected model mimo-v2.5-asr, got %s", req.Model)
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}
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if len(req.Messages) == 0 || req.Messages[0].Role != "user" {
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t.Error("expected user message")
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}
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if req.ASROptions == nil || req.ASROptions.Language != "zh" {
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t.Errorf("expected language zh, got %v", req.ASROptions)
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}
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resp := mimoResponse{
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Choices: []struct {
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Message struct {
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Content string `json:"content"`
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} `json:"message"`
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}{
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{Message: struct {
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Content string `json:"content"`
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}{Content: "你好世界"}},
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},
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(resp)
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})
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defer srv.Close()
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// 发送一个简单的有效 WAV（44 字节头 + 少量 PCM）
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wav := makeValidWAV([]byte{0x00, 0x00, 0x00, 0x00})
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text, err := s.Recognize(context.Background(), wav, Options{Language: "zh-CN"})
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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if text != "你好世界" {
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t.Errorf("expected '你好世界', got '%s'", text)
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}
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}
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func TestMiMoService_Recognize_EmptyAudio(t *testing.T) {
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s, srv := newTestMiMoService(func(w http.ResponseWriter, r *http.Request) {})
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defer srv.Close()
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_, err := s.Recognize(context.Background(), nil, Options{})
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if err == nil {
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t.Fatal("expected error for empty audio")
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}
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}
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func TestMiMoService_Recognize_ServerError(t *testing.T) {
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s, srv := newTestMiMoService(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusInternalServerError)
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w.Write([]byte("internal error"))
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})
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defer srv.Close()
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wav := makeValidWAV([]byte{0x00, 0x00})
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_, err := s.Recognize(context.Background(), wav, Options{})
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if err == nil {
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t.Fatal("expected error for 500 response")
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}
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}
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func TestMiMoService_Recognize_EmptyChoices(t *testing.T) {
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s, srv := newTestMiMoService(func(w http.ResponseWriter, r *http.Request) {
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resp := mimoResponse{Choices: nil}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(resp)
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})
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defer srv.Close()
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wav := makeValidWAV([]byte{0x00, 0x00})
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_, err := s.Recognize(context.Background(), wav, Options{})
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if err == nil {
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t.Fatal("expected error for empty choices")
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}
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}
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func TestMiMoService_Recognize_PCMAutoWrap(t *testing.T) {
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// 测试原始 PCM 数据自动封装为 WAV
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s, srv := newTestMiMoService(func(w http.ResponseWriter, r *http.Request) {
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var req mimoRequest
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body, _ := io.ReadAll(r.Body)
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if err := json.Unmarshal(body, &req); err != nil {
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t.Fatalf("unmarshal request: %v", err)
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}
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// 验证 data URL 格式
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if len(req.Messages) == 0 || len(req.Messages[0].Content) == 0 {
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t.Fatal("empty message content")
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}
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dataURL := req.Messages[0].Content[0].InputAudio.Data
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if len(dataURL) < 22 || dataURL[:14] != "data:audio/wav" {
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t.Errorf("expected wav data URL, got prefix: %s", dataURL[:min(len(dataURL), 30)])
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}
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// 验证 base64 可解码
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b64Part := dataURL[22:] // skip "data:audio/wav;base64,"
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decoded, err := base64.StdEncoding.DecodeString(b64Part)
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if err != nil {
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t.Fatalf("base64 decode failed: %v", err)
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}
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// 应该是有效 WAV（RIFF 头）
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if len(decoded) < 44 || string(decoded[:4]) != "RIFF" {
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t.Error("decoded data is not a valid WAV")
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}
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resp := mimoResponse{
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Choices: []struct {
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Message struct {
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Content string `json:"content"`
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} `json:"message"`
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}{
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{Message: struct {
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Content string `json:"content"`
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}{Content: "test"}},
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},
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(resp)
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})
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defer srv.Close()
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// 发送原始 PCM（非 WAV/MP3）
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pcm := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07}
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text, err := s.Recognize(context.Background(), pcm, Options{SampleRate: 16000})
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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if text != "test" {
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t.Errorf("expected 'test', got '%s'", text)
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}
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}
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func TestMapLanguage(t *testing.T) {
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tests := []struct {
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input string
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want string
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}{
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{"", "auto"},
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{"zh-CN", "zh"},
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{"zh", "zh"},
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{"en-US", "en"},
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{"en", "en"},
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{"ja", "auto"},
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}
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for _, tt := range tests {
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got := mapLanguage(tt.input)
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if got != tt.want {
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t.Errorf("mapLanguage(%q) = %q, want %q", tt.input, got, tt.want)
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}
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}
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}
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func TestIsWAV(t *testing.T) {
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if !isWAV([]byte("RIFF....")) {
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t.Error("expected true for RIFF header")
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}
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if isWAV([]byte("ID3...")) {
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t.Error("expected false for ID3 header")
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}
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if isWAV([]byte{0x00}) {
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t.Error("expected false for short data")
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}
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}
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func TestIsMP3(t *testing.T) {
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if !isMP3([]byte("ID3\x03")) {
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t.Error("expected true for ID3 header")
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}
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if !isMP3([]byte{0xFF, 0xFB, 0x00}) {
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t.Error("expected true for MP3 sync word")
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}
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if isMP3([]byte("RIFF")) {
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t.Error("expected false for RIFF header")
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}
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}
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func makeValidWAV(pcm []byte) []byte {
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// 构造一个最小有效 WAV
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wav := make([]byte, 44+len(pcm))
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copy(wav[:4], "RIFF")
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// little-endian size = 36 + len(pcm)
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size := uint32(36 + len(pcm))
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wav[4] = byte(size)
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wav[5] = byte(size >> 8)
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wav[6] = byte(size >> 16)
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wav[7] = byte(size >> 24)
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copy(wav[8:12], "WAVE")
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copy(wav[12:16], "fmt ")
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// fmt chunk size = 16
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wav[16] = 16
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// PCM format = 1
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wav[20] = 1
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// channels = 1
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wav[22] = 1
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// sample rate = 16000
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wav[24] = 0x80
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wav[25] = 0x3E
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// byte rate = 32000
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wav[28] = 0x00
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wav[29] = 0x7D
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// block align = 2
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wav[32] = 2
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// bits per sample = 16
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wav[34] = 16
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copy(wav[36:40], "data")
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dSize := uint32(len(pcm))
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wav[40] = byte(dSize)
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wav[41] = byte(dSize >> 8)
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wav[42] = byte(dSize >> 16)
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wav[43] = byte(dSize >> 24)
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copy(wav[44:], pcm)
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return wav
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}
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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