1 files changed, 33 insertions, 0 deletions
diff --git a/main/jpeg_decoder.h b/main/jpeg_decoder.h
new file mode 100644
index 0000000..9c5bf89
--- /dev/null
+++ b/main/jpeg_decoder.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "esp_err.h"
+
+#define JPEG_DECODER_MAX_INPUT_BYTES   (1024 * 1024)        // 1 MB
+#define JPEG_DECODER_MAX_OUTPUT_BYTES  (800 * 480 * 2)      // RGB565 panel native
+
+// One-time setup of the ESP32-P4 hardware JPEG decoder. Allocates reusable
+// DMA-aligned input + output buffers in PSRAM.
+esp_err_t jpeg_decoder_init(void);
+
+// The decoder owns shared scratch buffers. Caller must serialize access.
+// http_api uses a try-lock so concurrent /frame POSTs get 503 instead of
+// queueing.
+bool jpeg_decoder_try_lock(uint32_t timeout_ms);
+void jpeg_decoder_unlock(void);
+
+// Pointer to the input scratch buffer (PSRAM, DMA-aligned). Capacity =
+// JPEG_DECODER_MAX_INPUT_BYTES. Caller fills before calling decode.
+void *jpeg_decoder_input_buffer(void);
+
+// Decode the JPEG sitting in the input buffer. Fills out_rgb565 with a
+// pointer to the decoded RGB565 image and reports its width/height in
+// pixels.  The output buffer is owned by the decoder — valid only until
+// the next jpeg_decoder_unlock().
+esp_err_t jpeg_decoder_decode(size_t   jpeg_len,
+                              void   **out_rgb565,
+                              uint16_t *out_width,
+                              uint16_t *out_height);