[AT3P] Add GHA related bitstream code

* borrow Huffman table from FFmpeg
* code (with ut) to pack frequency part of GHA block
* some related data structures
* bitstrem modification to write correct GHA block
* switch compile flag to use float data type

1 files changed, 43 insertions, 0 deletions

diff --git a/src/atrac/at3p/at3p_gha.h b/src/atrac/at3p/at3p_gha.h
new file mode 100644
index 0000000..4625ac3
--- /dev/null
+++ b/src/atrac/at3p/at3p_gha.h
@@ -0,0 +1,43 @@
+#pragma once
+
+#include <config.h>
+#include <libgha/include/libgha.h>
+
+#include <vector>
+
+static_assert(sizeof(TFloat) == sizeof(float), "TFloat must be float32");
+namespace NAtracDEnc {
+
+struct TAt3PGhaData {
+    struct TWaveParam {
+        uint32_t FreqIndex;
+        uint32_t AmpSf;
+        uint32_t AmpIndex;
+        uint32_t PhaseIndex;
+        struct gha_info orig_gha_info;
+    };
+    struct TWaveSbInfo {
+        size_t WaveIndex;
+        size_t WaveNums;
+    };
+    struct TWavesChannel {
+        std::vector<TWaveSbInfo> WaveSbInfos;
+        std::vector<TWaveParam> WaveParams;
+    };
+    std::array<TWavesChannel, 2> Waves;
+
+    uint8_t NumToneBands;
+    uint8_t SecondChBands[16];
+
+    size_t GetNumWaves(size_t ch, size_t sb) const {
+        return Waves[ch].WaveSbInfos.at(sb).WaveNums;
+    }
+
+    std::pair<const TWaveParam*, size_t> GetWaves(size_t ch, size_t sb) const {
+        const auto& sbInfo = Waves[ch].WaveSbInfos.at(sb);
+        return { &Waves[ch].WaveParams[sbInfo.WaveIndex], sbInfo.WaveNums };
+    }
+};
+
+} // namespace NAtracDEnc
+