feat: [google-cloud-texttospeech] Add prompt to SynthesisInput (#14358)

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PiperOrigin-RevId: 802731785

Source-Link:
googleapis/googleapis@c866721

Source-Link:
googleapis/googleapis-gen@124a94d
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BEGIN_NESTED_COMMIT
feat: [google-cloud-texttospeech] Add string value prompt to
SynthesisInput
PiperOrigin-RevId: 802688528

Source-Link:
googleapis/googleapis@acdae9a

Source-Link:
googleapis/googleapis-gen@2118e2f
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END_NESTED_COMMIT

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

packages/google-cloud-texttospeech/google/cloud/texttospeech_v1/types/cloud_tts.py

@@ -441,6 +441,15 @@ class SynthesisInput(proto.Message):
             Only applicable for multi-speaker synthesis.
 
             This field is a member of `oneof`_ ``input_source``.
+        prompt (str):
+            This system instruction is supported only for
+            controllable/promptable voice models. If this
+            system instruction is used, we pass the unedited
+            text to Gemini-TTS. Otherwise, a default system
+            instruction is used. AI Studio calls this system
+            instruction, Style Instructions.
+
+            This field is a member of `oneof`_ ``_prompt``.
         custom_pronunciations (google.cloud.texttospeech_v1.types.CustomPronunciations):
             Optional. The pronunciation customizations
             are applied to the input. If this is set, the
@@ -478,6 +487,11 @@ class SynthesisInput(proto.Message):
         oneof="input_source",
         message="MultiSpeakerMarkup",
     )
+    prompt: str = proto.Field(
+        proto.STRING,
+        number=6,
+        optional=True,
+    )
     custom_pronunciations: "CustomPronunciations" = proto.Field(
         proto.MESSAGE,
         number=3,

packages/google-cloud-texttospeech/google/cloud/texttospeech_v1beta1/types/cloud_tts.py

@@ -468,6 +468,15 @@ class SynthesisInput(proto.Message):
             Only applicable for multi-speaker synthesis.
 
             This field is a member of `oneof`_ ``input_source``.
+        prompt (str):
+            This system instruction is supported only for
+            controllable/promptable voice models. If this
+            system instruction is used, we pass the unedited
+            text to Gemini-TTS. Otherwise, a default system
+            instruction is used. AI Studio calls this system
+            instruction, Style Instructions.
+
+            This field is a member of `oneof`_ ``_prompt``.
         custom_pronunciations (google.cloud.texttospeech_v1beta1.types.CustomPronunciations):
             Optional. The pronunciation customizations
             are applied to the input. If this is set, the
@@ -505,6 +514,11 @@ class SynthesisInput(proto.Message):
         oneof="input_source",
         message="MultiSpeakerMarkup",
     )
+    prompt: str = proto.Field(
+        proto.STRING,
+        number=6,
+        optional=True,
+    )
     custom_pronunciations: "CustomPronunciations" = proto.Field(
         proto.MESSAGE,
         number=3,