1 files changed, 65 insertions, 0 deletions
diff --git a/dom/media/platforms/ffmpeg/FFmpegAudioDecoder.h b/dom/media/platforms/ffmpeg/FFmpegAudioDecoder.h
new file mode 100644
index 0000000000..63f7f463b2
--- /dev/null
+++ b/dom/media/platforms/ffmpeg/FFmpegAudioDecoder.h
@@ -0,0 +1,65 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 __FFmpegAACDecoder_h__
+#define __FFmpegAACDecoder_h__
+
+#include "FFmpegDataDecoder.h"
+#include "FFmpegLibWrapper.h"
+
+namespace mozilla {
+
+template <int V>
+class FFmpegAudioDecoder {};
+
+template <>
+class FFmpegAudioDecoder<LIBAV_VER>;
+DDLoggedTypeNameAndBase(FFmpegAudioDecoder<LIBAV_VER>,
+                        FFmpegDataDecoder<LIBAV_VER>);
+
+template <>
+class FFmpegAudioDecoder<LIBAV_VER>
+    : public FFmpegDataDecoder<LIBAV_VER>,
+      public DecoderDoctorLifeLogger<FFmpegAudioDecoder<LIBAV_VER>> {
+ public:
+  FFmpegAudioDecoder(FFmpegLibWrapper* aLib, const AudioInfo& aConfig);
+  virtual ~FFmpegAudioDecoder();
+
+  RefPtr<InitPromise> Init() override;
+  void InitCodecContext() MOZ_REQUIRES(sMutex) override;
+  static AVCodecID GetCodecId(const nsACString& aMimeType);
+  nsCString GetDescriptionName() const override {
+#ifdef USING_MOZFFVPX
+    return "ffvpx audio decoder"_ns;
+#else
+    return "ffmpeg audio decoder"_ns;
+#endif
+  }
+  nsCString GetCodecName() const override;
+
+ private:
+  MediaResult DoDecode(MediaRawData* aSample, uint8_t* aData, int aSize,
+                       bool* aGotFrame, DecodedData& aResults) override;
+  // This method is to be called only when decoding mp3, in order to correctly
+  // discard padding frames.
+  uint64_t Padding() const;
+  // This method is to be called only when decoding AAC, in order to correctly
+  // discard padding frames, based on the number of frames decoded and the total
+  // frame count of the media.
+  uint64_t TotalFrames() const;
+  // The number of frames of encoder delay, that need to be discarded at the
+  // beginning of the stream.
+  uint32_t mEncoderDelay = 0;
+  // This holds either the encoder padding (when this decoder decodes mp3), or
+  // the total frame count of the media (when this decoder decodes AAC).
+  // It is best accessed via the `Padding` and `TotalFrames` methods, for
+  // clarity.
+  uint64_t mEncoderPaddingOrTotalFrames = 0;
+};
+
+}  // namespace mozilla
+
+#endif  // __FFmpegAACDecoder_h__