Disable FLAC encoding on Windows.

  - Libflac seems to have linking configured differently from other codecs.
  - To expedite getting a MSVC/Windows build working we can disable FLAC functionality entirely.
  - b/362229054: Add a TODO that we should fix the build and enable FLAC on Windows.
  - Drive-by: Clean some nearby BUILD targets.

PiperOrigin-RevId: 670995412

iamf/cli/codec/BUILD

@@ -49,11 +49,7 @@ cc_library(
     name = "aac_utils",
     srcs = [],
     hdrs = ["aac_utils.h"],
-    deps = [
-        "@com_google_absl//absl/log",
-        "@fdk_aac//:aac_encoder_lib",
-        "@fdk_aac//:fdk_sys_lib",
-    ],
+    deps = ["@fdk_aac//:fdk_sys_lib"],
 )
 
 cc_library(
@@ -78,9 +74,15 @@ cc_library(
     ],
 )
 
+# TODO(b/362229054): Enable FLAC support on Windows and unify `flac_encoder.cc` and
+#                    `flac_encoder_windows.cc`.
+
 cc_library(
     name = "flac_encoder",
-    srcs = ["flac_encoder.cc"],
+    srcs = select({
+        "@platforms//os:windows": ["flac_encoder_windows.cc"],
+        "//conditions:default": ["flac_encoder.cc"],
+    }),
     hdrs = ["flac_encoder.h"],
     deps = [
         ":encoder_base",

iamf/cli/codec/flac_encoder_windows.cc

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2024, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 3-Clause Clear License
+ * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
+ * License was not distributed with this source code in the LICENSE file, you
+ * can obtain it at www.aomedia.org/license/software-license/bsd-3-c-c. If the
+ * Alliance for Open Media Patent License 1.0 was not distributed with this
+ * source code in the PATENTS file, you can obtain it at
+ * www.aomedia.org/license/patent.
+ */
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+#include "absl/status/status.h"
+#include "iamf/cli/codec/flac_encoder.h"
+
+namespace iamf_tools {
+
+FlacEncoder::~FlacEncoder() {}
+
+absl::Status FlacEncoder::EncodeAudioFrame(
+    int /*input_bit_depth*/,
+    const std::vector<std::vector<int32_t>>& /*samples*/,
+    std::unique_ptr<AudioFrameWithData> /*partial_audio_frame_with_data*/) {
+  return absl::UnimplementedError(
+      "Encoding FLAC on native Windows is not yet implemented.");
+}
+
+absl::Status FlacEncoder::Finalize() {
+  return absl::UnimplementedError(
+      "Encoding FLAC on native Windows is not yet implemented.");
+}
+
+absl::Status FlacEncoder::InitializeEncoder() {
+  return absl::UnimplementedError(
+      "Encoding FLAC on native Windows is not yet implemented.");
+}
+
+}  // namespace iamf_tools