feat: add transcription backend contracts

src-tauri/src/transcription/mod.rs

@@ -0,0 +1,47 @@
+use std::path::PathBuf;
+
+use serde::{Deserialize, Serialize};
+
+use crate::error::AppResult;
+use crate::models::DEFAULT_MODEL_ID;
+
+pub mod crispasr;
+pub mod openai;
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct TranscriptionInput {
+    pub audio_path: PathBuf,
+    pub options: TranscriptionOptions,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct TranscriptionOptions {
+    pub model_id: String,
+    pub language: Option<String>,
+    pub timestamps: bool,
+}
+
+impl Default for TranscriptionOptions {
+    fn default() -> Self {
+        Self {
+            model_id: DEFAULT_MODEL_ID.to_string(),
+            language: None,
+            timestamps: false,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct TranscriptionResult {
+    pub text: String,
+    pub backend: String,
+    pub model_id: String,
+    pub detected_language: Option<String>,
+}
+
+pub trait Transcriber {
+    fn transcribe(&self, input: TranscriptionInput) -> AppResult<TranscriptionResult>;
+}