[PATCH 1/1] sapi: Create a new engine only when needed in ISpVoice.

[Shaun Ren]

From: Shaun Ren

Instead of creating the TTS voice engine directly in SetVoice, we save
the specified voice token, and only create them in speak_proc when
necessary.
---
 dlls/sapi/tts.c | 53 +++++++++++++++++++++++++++++++++----------------
 1 file changed, 36 insertions(+), 17 deletions(-)

diff --git a/dlls/sapi/tts.c b/dlls/sapi/tts.c
index 410a57b4bfc..a3149562f1e 100644
--- a/dlls/sapi/tts.c
+++ b/dlls/sapi/tts.c
@@ -43,6 +43,7 @@ struct speech_voice
     LONG ref;

ISpStreamFormat *output;
+    ISpObjectToken *engine_token;
     ISpTTSEngine *engine;
     LONG cur_stream_num;
     DWORD actions;
@@ -163,6 +164,7 @@ static ULONG WINAPI speech_voice_Release(ISpeechVoice *iface)
     {
         async_cancel_queue(&This->queue);
         if (This->output) ISpStreamFormat_Release(This->output);
+        if (This->engine_token) ISpObjectToken_Release(This->engine_token);
         if (This->engine) ISpTTSEngine_Release(This->engine);
         DeleteCriticalSection(&This->cs);

@@ -660,7 +662,7 @@ static HRESULT WINAPI spvoice_Resume(ISpVoice *iface)
 static HRESULT WINAPI spvoice_SetVoice(ISpVoice *iface, ISpObjectToken *token)
 {
     struct speech_voice *This = impl_from_ISpVoice(iface);
-    ISpTTSEngine *engine;
+    WCHAR *id = NULL, *old_id = NULL;
     HRESULT hr;

TRACE("(%p, %p).\n", iface, token);
@@ -673,26 +675,37 @@ static HRESULT WINAPI spvoice_SetVoice(ISpVoice *iface, ISpObjectToken *token)
     else
         ISpObjectToken_AddRef(token);

-    hr = ISpObjectToken_CreateInstance(token, NULL, CLSCTX_ALL, &IID_ISpTTSEngine, (void **)&engine);
-    ISpObjectToken_Release(token);
-    if (FAILED(hr))
-        return hr;
-
     EnterCriticalSection(&This->cs);

+    if (This->engine_token &&
+        SUCCEEDED(ISpObjectToken_GetId(token, &id)) &&
+        SUCCEEDED(ISpObjectToken_GetId(This->engine_token, &old_id)) &&
+        !wcscmp(id, old_id))
+    {
+        ISpObjectToken_Release(token);
+        goto done;
+    }
+
+    if (This->engine_token)
+        ISpObjectToken_Release(This->engine_token);
+    This->engine_token = token;
+
     if (This->engine)
+    {
         ISpTTSEngine_Release(This->engine);
-    This->engine = engine;
+        This->engine = NULL;
+    }

+done:
     LeaveCriticalSection(&This->cs);
-
+    CoTaskMemFree(id);
+    CoTaskMemFree(old_id);
     return S_OK;
 }

static HRESULT WINAPI spvoice_GetVoice(ISpVoice *iface, ISpObjectToken **token)
 {
     struct speech_voice *This = impl_from_ISpVoice(iface);
-    ISpObjectWithToken *engine_token_iface;
     HRESULT hr;

TRACE("(%p, %p).\n", iface, token);
@@ -702,17 +715,14 @@ static HRESULT WINAPI spvoice_GetVoice(ISpVoice *iface, ISpObjectToken **token)

EnterCriticalSection(&This->cs);

-    if (!This->engine)
+    if (!This->engine_token)
     {
         LeaveCriticalSection(&This->cs);
         return create_default_token(SPCAT_VOICES, token);
     }

-    if (SUCCEEDED(hr = ISpTTSEngine_QueryInterface(This->engine, &IID_ISpObjectWithToken, (void **)&engine_token_iface)))
-    {
-        hr = ISpObjectWithToken_GetObjectToken(engine_token_iface, token);
-        ISpObjectWithToken_Release(engine_token_iface);
-    }
+    ISpObjectToken_AddRef(This->engine_token);
+    *token = This->engine_token;

LeaveCriticalSection(&This->cs);

@@ -788,6 +798,14 @@ static void speak_proc(struct async_task *task)
         goto done;
     }

+    if (!This->engine &&
+        FAILED(hr = ISpObjectToken_CreateInstance(This->engine_token, NULL, CLSCTX_ALL, &IID_ISpTTSEngine, (void **)&This->engine)))
+    {
+        LeaveCriticalSection(&This->cs);
+        ERR("failed creating engine: %#lx.\n", hr);
+        goto done;
+    }
+
     if (FAILED(hr = set_output_format(This->output, This->engine, &fmtid, &wfx)))
     {
         LeaveCriticalSection(&This->cs);
@@ -891,9 +909,9 @@ static HRESULT WINAPI spvoice_Speak(ISpVoice *iface, const WCHAR *contents, DWOR
             return hr;
     }

-    if (!This->engine)
+    if (!This->engine_token)
     {
-        /* Create a new engine with the default voice. */
+        /* Set the engine token to default. */
         if (FAILED(hr = ISpVoice_SetVoice(iface, NULL)))
             return hr;
     }
@@ -1397,6 +1415,7 @@ HRESULT speech_voice_create(IUnknown *outer, REFIID iid, void **obj)
     This->ref = 1;

This->output = NULL;
+    This->engine_token = NULL;
     This->engine = NULL;
     This->cur_stream_num = 0;
     This->actions = SPVES_CONTINUE;