espressif: use custom allocator for MP3Decoder data

Author: jepler

ports/espressif/common-hal/audiomp3/__init__.c

@@ -0,0 +1,42 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2024 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include "py/mpprint.h"
+#include "esp_heap_caps.h"
+#include "shared-module/audiomp3/__init__.h"
+#include "supervisor/port_heap.h"
+
+void *mp3_alloc(size_t sz) {
+    void *ptr = heap_caps_malloc(sz, MALLOC_CAP_8BIT);
+    mp_printf(&mp_plat_print, "alloc(%d) -> %ptr\n", (int)sz, ptr);
+    return ptr;
+}
+
+void mp3_free(void *ptr) {
+    mp_printf(&mp_plat_print, "free(%p)\n", ptr);
+    heap_caps_free(ptr);
+}

ports/espressif/mpconfigport.mk

@@ -179,4 +179,6 @@ USB_NUM_IN_ENDPOINTS = 5
 # Usually lots of flash space available
 CIRCUITPY_MESSAGE_COMPRESSION_LEVEL ?= 1
 
+# Don't enable mp3 by default but DO allocate it to on-chip RAM if enabled
 CIRCUITPY_AUDIOMP3 ?= 0
+CIRCUITPY_AUDIOMP3_USE_PORT_ALLOCATOR ?= 1