MP3Decoder: Allow port to override the allocator

.. espressif will be able to put the mp3 data in faster RAM this way.

Author: jepler

py/circuitpy_defns.mk

@@ -782,7 +782,11 @@ SRC_MOD += $(addprefix lib/mp3/src/, \
 	subband.c \
 	trigtabs.c \
 )
-$(BUILD)/lib/mp3/src/buffers.o: CFLAGS += -include "py/misc.h" -D'MPDEC_ALLOCATOR(x)=m_malloc(x)' -D'MPDEC_FREE(x)=m_free(x)'
+$(BUILD)/lib/mp3/src/buffers.o: CFLAGS += -include "shared-module/audiomp3/__init__.h" -D'MPDEC_ALLOCATOR(x)=mp3_alloc(x)' -D'MPDEC_FREE(x)=mp3_free(x)'
+ifeq ($(CIRCUITPY_AUDIOMP3_USE_PORT_ALLOCATOR),1)
+SRC_COMMON_HAL_ALL += \
+	audiomp3/__init__.c
+endif
 endif
 
 ifeq ($(CIRCUITPY_GIFIO),1)

shared-module/audiomp3/__init__.c

@@ -0,0 +1,38 @@
+/*
+ * 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/mpconfig.h"
+#include "py/misc.h"
+#include "shared-module/audiomp3/__init__.h"
+
+MP_WEAK void *mp3_alloc(size_t sz) {
+    return m_malloc_maybe(sz);
+}
+
+MP_WEAK void mp3_free(void *ptr) {
+    m_free(ptr);
+}

shared-module/audiomp3/__init__.h

@@ -24,7 +24,9 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_SHARED_MODULE_AUDIOMP3__INIT__H
-#define MICROPY_INCLUDED_SHARED_MODULE_AUDIOMP3__INIT__H
+#pragma once
 
-#endif  // MICROPY_INCLUDED_SHARED_MODULE_AUDIOMP3__INIT__H
+#include <stdlib.h>
+
+extern void *mp3_alloc(size_t sz);
+extern void mp3_free(void *ptr);