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native/include/buffer_converter.h

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+#ifndef BUFFER_CONVERTER_H
+#define BUFFER_CONVERTER_H
+
+#include <cstdint>
+#include <cstddef>
+
+// Buffer format conversion utilities for HAL compatibility.
+// Converts between decoder output formats and HAL-expected formats.
+// Uses ARM NEON intrinsics for performance on Pixel 9a (arm64-v8a).
+
+namespace buffer_converter {
+
+// Convert YUV420 planar (I420) to NV21 (semi-planar, VU interleaved)
+// YUV420 planar: Y plane, U plane, V plane (separate)
+// NV21: Y plane, VU interleaved plane
+//
+// src_y, src_u, src_v: source plane pointers
+// src_y_stride, src_uv_stride: source plane strides (bytes per row)
+// dst_nv21: destination buffer (Y plane followed by VU interleaved)
+// dst_y_stride, dst_uv_stride: destination strides
+// width, height: frame dimensions
+//
+// Returns true on success, false on error
+bool yuv420_planar_to_nv21(
+    const uint8_t* src_y, int src_y_stride,
+    const uint8_t* src_u, int src_u_stride,
+    const uint8_t* src_v, int src_v_stride,
+    uint8_t* dst_nv21, int dst_y_stride, int dst_uv_stride,
+    int width, int height);
+
+// Convert YUV420 planar (I420) to YUV420 planar with different stride
+// Handles stride mismatch between decoder output and HAL buffer.
+// Copies Y plane with stride adjustment, then U and V planes.
+//
+// Returns true on success
+bool yuv420_planar_copy_with_stride(
+    const uint8_t* src_y, int src_y_stride,
+    const uint8_t* src_u, int src_u_stride,
+    const uint8_t* src_v, int src_v_stride,
+    uint8_t* dst_y, int dst_y_stride,
+    uint8_t* dst_u, int dst_u_stride,
+    uint8_t* dst_v, int dst_v_stride,
+    int width, int height);
+
+// Convert NV21 (semi-planar) to YUV420 planar (I420)
+// Used when decoder outputs NV21 but HAL expects planar.
+//
+// Returns true on success
+bool nv21_to_yuv420_planar(
+    const uint8_t* src_nv21, int src_y_stride, int src_uv_stride,
+    uint8_t* dst_y, int dst_y_stride,
+    uint8_t* dst_u, int dst_u_stride,
+    uint8_t* dst_v, int dst_v_stride,
+    int width, int height);
+
+// Fast Y plane copy with NEON (handles stride mismatch)
+// Copies width bytes per row, advancing by stride each row.
+void copy_plane_neon(
+    const uint8_t* src, int src_stride,
+    uint8_t* dst, int dst_stride,
+    int width, int height);
+
+// Interleave U and V planes into NV21 format (VU order) using NEON
+void interleave_uv_to_nv21_neon(
+    const uint8_t* src_u, int src_u_stride,
+    const uint8_t* src_v, int src_v_stride,
+    uint8_t* dst_vu, int dst_vu_stride,
+    int width, int height);
+
+} // namespace buffer_converter
+
+#endif // BUFFER_CONVERTER_H