From e8b398ca34242b14600e929b8aaeffdf780bd64a Mon Sep 17 00:00:00 2001
From: Alex Studer <alex@studer.dev>
Date: Wed, 3 Jul 2024 15:55:30 -0400
Subject: [PATCH] LibMedia: Add a stub implementation of FFmpegVideoDecoder for
 Android

We don't have ffmpeg available on Android, so provide a dummy
FFmpegVideoDecoder and disable linking against ffmpeg for Android.
---
 Userland/Libraries/LibMedia/CMakeLists.txt    | 17 +++++--
 .../FFmpeg/FFmpegVideoDecoderStub.cpp         | 49 +++++++++++++++++++
 2 files changed, 61 insertions(+), 5 deletions(-)
 create mode 100644 Userland/Libraries/LibMedia/FFmpeg/FFmpegVideoDecoderStub.cpp

diff --git a/Userland/Libraries/LibMedia/CMakeLists.txt b/Userland/Libraries/LibMedia/CMakeLists.txt
index 350c2c58463..26d8f4263a0 100644
--- a/Userland/Libraries/LibMedia/CMakeLists.txt
+++ b/Userland/Libraries/LibMedia/CMakeLists.txt
@@ -4,15 +4,22 @@ set(SOURCES
     Color/TransferCharacteristics.cpp
     Containers/Matroska/MatroskaDemuxer.cpp
     Containers/Matroska/Reader.cpp
-    FFmpeg/FFmpegVideoDecoder.cpp
     PlaybackManager.cpp
     VideoFrame.cpp
 )
 
+if (NOT ANDROID)
+    list(APPEND SOURCES FFmpeg/FFmpegVideoDecoder.cpp)
+else()
+    list(APPEND SOURCES FFmpeg/FFmpegVideoDecoderStub.cpp)
+endif()
+
 serenity_lib(LibMedia media)
 target_link_libraries(LibMedia PRIVATE LibCore LibIPC LibGfx LibThreading)
 
-# Third-party
-find_package(PkgConfig REQUIRED)
-pkg_check_modules(AVCODEC REQUIRED IMPORTED_TARGET libavcodec)
-target_link_libraries(LibMedia PRIVATE PkgConfig::AVCODEC)
+if (NOT ANDROID)
+    # Third-party
+    find_package(PkgConfig REQUIRED)
+    pkg_check_modules(AVCODEC REQUIRED IMPORTED_TARGET libavcodec)
+    target_link_libraries(LibMedia PRIVATE PkgConfig::AVCODEC)
+endif()
diff --git a/Userland/Libraries/LibMedia/FFmpeg/FFmpegVideoDecoderStub.cpp b/Userland/Libraries/LibMedia/FFmpeg/FFmpegVideoDecoderStub.cpp
new file mode 100644
index 00000000000..2331f3f5b14
--- /dev/null
+++ b/Userland/Libraries/LibMedia/FFmpeg/FFmpegVideoDecoderStub.cpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2024, Alex Studer <alex@studer.dev>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/System.h>
+#include <LibMedia/VideoFrame.h>
+
+#include "FFmpegForward.h"
+#include "FFmpegVideoDecoder.h"
+
+namespace Media::FFmpeg {
+
+DecoderErrorOr<NonnullOwnPtr<FFmpegVideoDecoder>> FFmpegVideoDecoder::try_create(CodecID codec_id, ReadonlyBytes codec_initialization_data)
+{
+    (void)codec_id;
+    (void)codec_initialization_data;
+    return DecoderError::format(DecoderErrorCategory::NotImplemented, "FFmpeg not available on this platform");
+}
+
+FFmpegVideoDecoder::FFmpegVideoDecoder(AVCodecContext* codec_context, AVPacket* packet, AVFrame* frame)
+    : m_codec_context(codec_context)
+    , m_packet(packet)
+    , m_frame(frame)
+{
+}
+
+FFmpegVideoDecoder::~FFmpegVideoDecoder()
+{
+}
+
+DecoderErrorOr<void> FFmpegVideoDecoder::receive_sample(Duration timestamp, ReadonlyBytes sample)
+{
+    (void)timestamp;
+    (void)sample;
+    return DecoderError::format(DecoderErrorCategory::NotImplemented, "FFmpeg not available on this platform");
+}
+
+DecoderErrorOr<NonnullOwnPtr<VideoFrame>> FFmpegVideoDecoder::get_decoded_frame()
+{
+    return DecoderError::format(DecoderErrorCategory::NotImplemented, "FFmpeg not available on this platform");
+}
+
+void FFmpegVideoDecoder::flush()
+{
+}
+
+}