Create RingBuffer for VoiceAssistant (#6102)

esphome/core/ring_buffer.cpp

@@ -0,0 +1,49 @@
+#include "ring_buffer.h"
+
+#include "esphome/core/helpers.h"
+#include "esphome/core/log.h"
+
+#ifdef USE_ESP32
+
+#include "helpers.h"
+
+namespace esphome {
+
+static const char *const TAG = "ring_buffer";
+
+std::unique_ptr<RingBuffer> RingBuffer::create(size_t len) {
+  std::unique_ptr<RingBuffer> rb = make_unique<RingBuffer>();
+
+  ExternalRAMAllocator<uint8_t> allocator(ExternalRAMAllocator<uint8_t>::ALLOW_FAILURE);
+  rb->storage_ = allocator.allocate(len);
+  if (rb->storage_ == nullptr) {
+    return nullptr;
+  }
+
+  rb->handle_ = xStreamBufferCreateStatic(len, 0, rb->storage_, &rb->structure_);
+  return rb;
+}
+
+size_t RingBuffer::read(void *data, size_t size, TickType_t ticks_to_wait) {
+  return xStreamBufferReceive(this->handle_, data, size, ticks_to_wait);
+}
+
+size_t RingBuffer::write(void *data, size_t len) {
+  size_t free = this->free();
+  if (free < len) {
+    size_t needed = len - free;
+    uint8_t discard[needed];
+    xStreamBufferReceive(this->handle_, discard, needed, 0);
+  }
+  return xStreamBufferSend(this->handle_, data, len, 0);
+}
+
+size_t RingBuffer::available() const { return xStreamBufferBytesAvailable(this->handle_); }
+
+size_t RingBuffer::free() const { return xStreamBufferSpacesAvailable(this->handle_); }
+
+BaseType_t RingBuffer::reset() { return xStreamBufferReset(this->handle_); }
+
+}  // namespace esphome
+
+#endif