feat: piper now not a subprocess, cache system for TTS

1 files changed, 52 insertions, 0 deletions

diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..d152090
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,52 @@
+fn main() {
+    // espeak-rs-sys builds espeak-ng from source but misses linking sonic
+    // and the speechPlayer audio_object symbols. piper-rs only uses
+    // espeak-ng for phonemization (never audio output), so stub implementations
+    // satisfy the linker without providing real functionality.
+
+    let out_dir = std::env::var("OUT_DIR").unwrap();
+    let stubs_c = format!("{}/tts_stubs.c", out_dir);
+    let stubs_o = format!("{}/tts_stubs.o", out_dir);
+    let stubs_a = format!("{}/libtts_stubs.a", out_dir);
+
+    std::fs::write(
+        &stubs_c,
+        r#"
+#include <stddef.h>
+typedef void* sonicStream;
+sonicStream sonicCreateStream(int sampleRate, int channels) { return NULL; }
+void sonicDestroyStream(sonicStream s) {}
+void sonicSetSpeed(sonicStream s, float speed) {}
+float sonicGetSpeed(sonicStream s) { return 1.0f; }
+void sonicWriteShortToStream(sonicStream s, const short *samples, int n) {}
+int sonicReadShortFromStream(sonicStream s, short *samples, int n) { return 0; }
+void sonicFlushStream(sonicStream s) {}
+typedef void* audio_object_t;
+int audio_object_open(audio_object_t o) { return 0; }
+int audio_object_write(audio_object_t o, const void *buf, size_t n) { return (int)n; }
+int audio_object_close(audio_object_t o) { return 0; }
+int audio_object_flush(audio_object_t o) { return 0; }
+int audio_object_drain(audio_object_t o) { return 0; }
+const char* audio_object_strerror(audio_object_t o, int err) { return "stub"; }
+audio_object_t create_audio_device_object(void* d, const char* device) { return NULL; }
+"#,
+    )
+    .expect("write stubs");
+
+    // cc -c
+    let status = std::process::Command::new("cc")
+        .args(["-c", &stubs_c, "-o", &stubs_o])
+        .status()
+        .expect("run cc");
+    assert!(status.success(), "cc -c failed");
+
+    // ar rcs
+    let status = std::process::Command::new("ar")
+        .args(["rcs", &stubs_a, &stubs_o])
+        .status()
+        .expect("run ar");
+    assert!(status.success(), "ar rcs failed");
+
+    println!("cargo:rustc-link-search=native={}", out_dir);
+    println!("cargo:rustc-link-lib=static=tts_stubs");
+}