Merge branch 'at3plus-dev'

It looks like we are able to encode ATRAC3PLUS compatible bitstream so we can merge at3p development branch in to the main branch.
Current limitation for AT3P mode:
- Only 352 Kbps (proper bit allocation and some psychoacoustic must be implemented)
- GHA sometime works with error (but huge bitrate hide it)
- No VLC, VQ, delta encoding
- No noise substitution
- No gain control
- No window shape switching

1 files changed, 71 insertions, 0 deletions

diff --git a/src/lib/bs_encode/encode.h b/src/lib/bs_encode/encode.h
new file mode 100644
index 0000000..3302d10
--- /dev/null
+++ b/src/lib/bs_encode/encode.h
@@ -0,0 +1,71 @@
+/*
+ * This file is part of AtracDEnc.
+ *
+ * AtracDEnc is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * AtracDEnc is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with AtracDEnc; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#pragma once
+
+#include <memory>
+#include <vector>
+#include <functional>
+
+namespace NBitStream {
+class TBitStream;
+}
+
+namespace NAtracDEnc {
+
+class TBitAllocHandler {
+public:
+    void Start(size_t targetBits, float minLambda, float maxLambda) noexcept;
+    float Continue() noexcept;
+    bool Check(size_t gitBits) const noexcept;
+    void Submit(size_t gotBits) noexcept;
+
+    // Returns consumption of all previous encoded parts (except part from this method called)
+    uint32_t GetCurGlobalConsumption() const noexcept;
+};
+
+class IBitStreamPartEncoder {
+public:
+    using TPtr = std::unique_ptr<IBitStreamPartEncoder>;
+    enum class EStatus {
+        Ok, // Ok, go to the next stage
+        Repeat, // Repeat from first stage
+    };
+
+    virtual ~IBitStreamPartEncoder() = default;
+    virtual EStatus Encode(void* frameData, TBitAllocHandler& ba) = 0;
+    virtual void Dump(NBitStream::TBitStream& bs) = 0;
+    virtual void Reset() noexcept {};
+    virtual uint32_t GetConsumption() const noexcept = 0;
+};
+
+class TBitStreamEncoder {
+public:
+    class TImpl;
+    explicit TBitStreamEncoder(std::vector<IBitStreamPartEncoder::TPtr>&& encoders);
+    ~TBitStreamEncoder();
+
+    void Do(void* frameData, NBitStream::TBitStream& bs);
+    TBitStreamEncoder(const TBitStreamEncoder&) = delete;
+    TBitStreamEncoder& operator=(const TBitStreamEncoder&) = delete;
+private:
+    std::vector<IBitStreamPartEncoder::TPtr> Encoders;
+    TImpl* Impl;
+};
+
+}