3 files changed, 152 insertions, 0 deletions
diff --git a/chromium/chromeos/services/tts/BUILD.gn b/chromium/chromeos/services/tts/BUILD.gn
new file mode 100644
index 00000000000..e2feb37c081
--- /dev/null
+++ b/chromium/chromeos/services/tts/BUILD.gn
@@ -0,0 +1,58 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//tools/generate_library_loader/generate_library_loader.gni")
+
+source_set("tts") {
+  sources = [
+    "constants.cc",
+    "constants.h",
+    "tts_service.cc",
+    "tts_service.h",
+  ]
+
+  deps = [
+    ":libchrometts",
+    "//base",
+    "//chromeos/services/tts/public/mojom",
+  ]
+}
+
+source_set("sandbox_hook") {
+  sources = [
+    "tts_sandbox_hook.cc",
+    "tts_sandbox_hook.h",
+  ]
+
+  deps = [
+    ":libchrometts",
+    ":tts",
+    "//base",
+    "//sandbox/linux:sandbox_services",
+    "//services/service_manager/sandbox:sandbox",
+  ]
+}
+
+generate_library_loader("libchrometts") {
+  name = "LibChromeTtsLoader"
+  output_h = "libchrometts.h"
+  output_cc = "libchrometts_loader.cc"
+  header = "<chrome_tts.h>"
+  bundled_header = "\"chromeos/services/tts/chrome_tts.h\""
+
+  functions = [
+    "GoogleTtsSetLogger",
+    "GoogleTtsInit",
+    "GoogleTtsShutdown",
+    "GoogleTtsInstallVoice",
+    "GoogleTtsInitBuffered",
+    "GoogleTtsReadBuffered",
+    "GoogleTtsFinalizeBuffered",
+    "GoogleTtsGetEventBufferPtr",
+    "GoogleTtsGetEventBufferLen",
+    "GoogleTtsGetTimepointsCount",
+    "GoogleTtsGetTimepointsTimeInSecsAtIndex",
+    "GoogleTtsGetTimepointsCharIndexAtIndex",
+  ]
+}
diff --git a/chromium/chromeos/services/tts/public/mojom/BUILD.gn b/chromium/chromeos/services/tts/public/mojom/BUILD.gn
new file mode 100644
index 00000000000..b677781871c
--- /dev/null
+++ b/chromium/chromeos/services/tts/public/mojom/BUILD.gn
@@ -0,0 +1,9 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//mojo/public/tools/bindings/mojom.gni")
+
+mojom("mojom") {
+  sources = [ "tts_service.mojom" ]
+}
diff --git a/chromium/chromeos/services/tts/public/mojom/tts_service.mojom b/chromium/chromeos/services/tts/public/mojom/tts_service.mojom
new file mode 100644
index 00000000000..a8fd1cdb6cf
--- /dev/null
+++ b/chromium/chromeos/services/tts/public/mojom/tts_service.mojom
@@ -0,0 +1,85 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module chromeos.tts.mojom;
+
+// Structure describing a point in time during speech synthesis.
+struct Timepoint {
+  // The time, in seconds.
+  float time_sec;
+
+  // The index in the text being spoken.
+  int32 char_index;
+};
+
+// A TTS event and associated metadata within a TTS stream.
+struct TtsStreamItem {
+  // An internal serialized proto.speech.tts.TtsControllerEvent proto.
+  array<uint8> event_buffer_bytes;
+
+  // Whether streaming is complete.
+  bool done;
+
+  // A list of timepoints associated with the event above.
+  array<Timepoint> timepoints;
+};
+
+// The main interface to the TTS engine on Chrome OS. Only used by and private
+// to the Chrome OS Google TTS engine component extension. TtsService lives in a
+// tts-sandboxed process.  TtsEngineExtensionObserver, the other end of this
+// interface, in the browser process, brokers a connection between TtsService
+// and the Google TTS engine component extension through a TtsStream, but does
+// not participate otherwise.
+interface TtsService {
+  // Binds a TtsStream to this service.
+  BindTtsStream(pending_receiver<TtsStream> receiver);
+};
+
+// Interface for the Google component TTS engine to control and consume a stream
+// of TtsStreamItems produced by TtsService. There is only ever one TtsStream
+// owned by the TtsService.
+//
+// The component extension sets up the stream's voice by doing:
+// InstallVoice(data, "voice")
+// InstallVoice(other_data, "other_voice")
+// SelectVoice("other_voice")
+//
+// After reading from the stream (see below), the component extension can do:
+// SelectVoice("voice")
+// to change voices.
+//
+// The component extension calls the following three methods repeatedly, in
+// order to read from the stream given text. For example,
+//
+// Init(<a proto containing text "Hello there.">)
+// Read()
+// Read()
+// ...
+// Finalize()
+// Init(<proto containing text "Testing 1, 2, 3.")
+// Read()
+// Read()
+// ...
+// Finalize()
+//
+// Note that the component extension may call Finalize() early, if the TTS api
+// wants to, for example, stop speech.
+interface TtsStream {
+  // Forward and install the |voice_name| encoded by |voice_bytes|.
+  InstallVoice(string voice_name, array<uint8> voice_bytes)
+      => (bool success);
+
+  // Selects a voice for streaming given a |voice_name|.
+  SelectVoice(string voice_name) => (bool success);
+
+  // Initialize a new TTS stream given a serialized proto.speech.tts.Text proto.
+  Init(array<uint8> text_jspb)
+      => (bool success);
+
+  // Read the next stream item.
+  Read() => (TtsStreamItem item);
+
+  // Clean up and finish the current TTS stream.
+  Finalize();
+};