1 files changed, 94 insertions, 0 deletions
diff --git a/dom/media/platforms/ffmpeg/FFmpegLibWrapper.h b/dom/media/platforms/ffmpeg/FFmpegLibWrapper.h
new file mode 100644
index 000000000..d6944a1d8
--- /dev/null
+++ b/dom/media/platforms/ffmpeg/FFmpegLibWrapper.h
@@ -0,0 +1,94 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __FFmpegLibWrapper_h__
+#define __FFmpegLibWrapper_h__
+
+#include "mozilla/Types.h"
+
+struct AVCodec;
+struct AVCodecContext;
+struct AVFrame;
+struct AVPacket;
+struct AVDictionary;
+struct AVCodecParserContext;
+struct PRLibrary;
+
+namespace mozilla
+{
+
+struct FFmpegLibWrapper
+{
+  FFmpegLibWrapper();
+  ~FFmpegLibWrapper();
+
+  enum class LinkResult
+  {
+    Success,
+    NoProvidedLib,
+    NoAVCodecVersion,
+    CannotUseLibAV57,
+    BlockedOldLibAVVersion,
+    UnknownFutureLibAVVersion,
+    UnknownFutureFFMpegVersion,
+    UnknownOlderFFMpegVersion,
+    MissingFFMpegFunction,
+    MissingLibAVFunction,
+  };
+  // Examine mAVCodecLib and mAVUtilLib, and attempt to resolve all symbols.
+  // Upon failure, the entire object will be reset and any attached libraries
+  // will be unlinked.
+  LinkResult Link();
+
+  // Reset the wrapper and unlink all attached libraries.
+  void Unlink();
+
+  // indicate the version of libavcodec linked to.
+  // 0 indicates that the function wasn't initialized with Link().
+  int mVersion;
+
+  // libavcodec
+  unsigned (*avcodec_version)();
+  int (*av_lockmgr_register)(int (*cb)(void** mutex, int op));
+  AVCodecContext* (*avcodec_alloc_context3)(const AVCodec* codec);
+  int (*avcodec_close)(AVCodecContext* avctx);
+  int (*avcodec_decode_audio4)(AVCodecContext* avctx, AVFrame* frame, int* got_frame_ptr, const AVPacket* avpkt);
+  int (*avcodec_decode_video2)(AVCodecContext* avctx, AVFrame* picture, int* got_picture_ptr, const AVPacket* avpkt);
+  AVCodec* (*avcodec_find_decoder)(int id);
+  void (*avcodec_flush_buffers)(AVCodecContext *avctx);
+  int (*avcodec_open2)(AVCodecContext *avctx, const AVCodec* codec, AVDictionary** options);
+  void (*avcodec_register_all)();
+  void (*av_init_packet)(AVPacket* pkt);
+  AVCodecParserContext* (*av_parser_init)(int codec_id);
+  void (*av_parser_close)(AVCodecParserContext* s);
+  int (*av_parser_parse2)(AVCodecParserContext* s, AVCodecContext* avctx, uint8_t** poutbuf, int* poutbuf_size, const uint8_t* buf, int buf_size, int64_t pts, int64_t dts, int64_t pos);
+
+  // only used in libavcodec <= 54
+  AVFrame* (*avcodec_alloc_frame)();
+  void (*avcodec_get_frame_defaults)(AVFrame* pic);
+  // libavcodec v54 only
+  void (*avcodec_free_frame)(AVFrame** frame);
+
+  // libavutil
+  void (*av_log_set_level)(int level);
+  void*	(*av_malloc)(size_t size);
+  void (*av_freep)(void *ptr);
+
+  // libavutil v55 and later only
+  AVFrame* (*av_frame_alloc)();
+  void (*av_frame_free)(AVFrame** frame);
+  void (*av_frame_unref)(AVFrame* frame);
+
+  // libavutil optional
+  int (*av_frame_get_colorspace)(const AVFrame *frame);
+
+  PRLibrary* mAVCodecLib;
+  PRLibrary* mAVUtilLib;
+
+private:
+};
+
+} // namespace mozilla
+
+#endif // FFmpegLibWrapper
+\ No newline at end of file