feat: Intel HDA audio driver, audio streaming syscalls, userspace Music app, fixes and improvements, rudimentary Bluetooth support

2026-03-10 17:14:33 +01:00
parent 807c2602fe
commit 576ad34f95
58 changed files with 11275 additions and 137 deletions
@@ -0,0 +1,90 @@
+/*
+    * Sbc.hpp
+    * SBC (Sub-Band Codec) encoder for Bluetooth A2DP
+    * Fixed-point implementation (no FPU/SSE required)
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+
+namespace Drivers::USB::Bluetooth::Sbc {
+
+    // =========================================================================
+    // SBC configuration
+    // =========================================================================
+
+    // Standard SBC parameters for A2DP
+    constexpr int SBC_SUBBANDS   = 8;
+    constexpr int SBC_BLOCKS     = 16;
+    constexpr int SBC_CHANNELS   = 2;    // Stereo
+    constexpr int SBC_BITPOOL    = 53;   // Standard quality
+
+    // Allocation method
+    constexpr uint8_t ALLOC_SNR    = 0;
+    constexpr uint8_t ALLOC_LOUDNESS = 1;
+
+    // Channel mode
+    constexpr uint8_t MODE_MONO         = 0;
+    constexpr uint8_t MODE_DUAL_CHANNEL = 1;
+    constexpr uint8_t MODE_STEREO       = 2;
+    constexpr uint8_t MODE_JOINT_STEREO = 3;
+
+    // Sampling frequency
+    constexpr uint8_t FREQ_16000  = 0;
+    constexpr uint8_t FREQ_32000  = 1;
+    constexpr uint8_t FREQ_44100  = 2;
+    constexpr uint8_t FREQ_48000  = 3;
+
+    // SBC frame header
+    struct SbcHeader {
+        uint8_t SyncWord;       // 0x9C
+        uint8_t Config;         // freq(2) | blocks(2) | mode(2) | alloc(1) | subbands(1)
+        uint8_t Bitpool;
+        uint8_t Crc;
+    } __attribute__((packed));
+
+    // =========================================================================
+    // Encoder state
+    // =========================================================================
+
+    struct SbcEncoder {
+        uint8_t  Frequency;
+        uint8_t  Blocks;
+        uint8_t  ChannelMode;
+        uint8_t  AllocMethod;
+        uint8_t  Subbands;
+        uint8_t  Bitpool;
+        uint8_t  Channels;
+
+        // Analysis filter state (per-channel windowed buffer)
+        int32_t  X[SBC_CHANNELS][SBC_SUBBANDS * 10];
+        int      XPos[SBC_CHANNELS];
+
+        // Computed frame size in bytes
+        uint32_t FrameSize;
+
+        // Samples per frame
+        uint32_t SamplesPerFrame;  // blocks * subbands
+    };
+
+    // =========================================================================
+    // Public API
+    // =========================================================================
+
+    // Initialize encoder with given parameters
+    void Init(SbcEncoder* enc, uint32_t sampleRate, uint8_t channels, uint8_t bitsPerSample);
+
+    // Encode one SBC frame from PCM data
+    // pcm: interleaved 16-bit signed PCM, length = blocks * subbands * channels
+    // out: output buffer for SBC frame
+    // Returns number of bytes written to out
+    uint32_t Encode(SbcEncoder* enc, const int16_t* pcm, uint8_t* out);
+
+    // Get the frame size in bytes for the current configuration
+    uint32_t GetFrameSize(const SbcEncoder* enc);
+
+    // Get the number of PCM samples consumed per frame (per channel)
+    uint32_t GetSamplesPerFrame(const SbcEncoder* enc);
+
+}