audio support decode mp3.

cocos/CMakeLists.txt

@@ -137,6 +137,7 @@ target_include_directories(cocos2d
     PRIVATE ${COCOS2DX_ROOT_PATH}/cocos/editor-support/fairygui
     PRIVATE ${COCOS2DX_ROOT_PATH}/external/libogg
     PRIVATE ${COCOS2DX_ROOT_PATH}/external/libvorbis
+    PRIVATE ${COCOS2DX_ROOT_PATH}/external/minimp3
     INTERFACE ${COCOS2DX_ROOT_PATH}/cocos/base
     INTERFACE ${COCOS2DX_ROOT_PATH}/cocos/audio/include
     INTERFACE ${COCOS2DX_ROOT_PATH}/cocos/platform/${PLATFORM_FOLDER}

cocos/audio/CMakeLists.txt

@@ -2,10 +2,12 @@ set(AUDIO_SRC
 	audio/RDAudio.cpp
 	audio/RDAudioOgg.cpp
 	audio/RDAudioAAC.cpp
+	audio/RDAudioMP3.cpp
 	)
 
 set(AUDIO_HEADER
 	audio/RDAudio.h
 	audio/RDAudioOgg.h
 	audio/RDAudioAAC.h
+	audio/RDAudioMP3.h
 	)

cocos/audio/RDAudio.cpp

@@ -18,6 +18,7 @@
 #include "cocos/audio/RDAudio.h"
 #include "cocos/audio/RDAudioOgg.h"
 #include "cocos/audio/RDAudioAAC.h"
+#include "cocos/audio/RDAudioMP3.h"
 #include "cocos2d.h"
 
 // singleton stuff
@@ -161,6 +162,13 @@ void RDAudio::threadLoop()
                                     &asyncStruct->channels,
                                     &asyncStruct->rate,
                                     &asyncStruct->size);
+            } else if (ext == ".mp3") {
+                rtn = decodeMP3(data.getBytes(),
+                                    data.getSize(),
+                                    &asyncStruct->pcmData,
+                                    &asyncStruct->channels,
+                                    &asyncStruct->rate,
+                                    &asyncStruct->size);
             }
             
             if (rtn < 0) {

cocos/audio/RDAudioMP3.cpp

@@ -0,0 +1,56 @@
+// Copyright 2021 KeNan Liu
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdlib.h>
+#include <memory.h>
+#include <string.h>
+
+#include "RDAudioMP3.h"
+
+#define MINIMP3_IMPLEMENTATION
+#define MINIMP3_FLOAT_OUTPUT
+#include "minimp3_ex.h"
+
+int decodeMP3(unsigned char *mp3Data,
+              int mp3Size,
+              unsigned char **pcmData,
+              int *pcmChannels,
+              int *pcmRate,
+              int *pcmSize)
+{
+    mp3dec_t mp3d;
+    mp3dec_file_info_t info;
+    memset(&info, 0, sizeof(info));
+
+    int ret = mp3dec_load_buf(&mp3d, mp3Data, mp3Size, &info, 0, 0);
+    if(0 != ret) {
+        printf("error: mp3dec_load_buf %d\n", ret);
+        return -1;
+    }
+
+    int size = info.samples * sizeof(int16_t);
+    int16_t* buffer = (int16_t *)malloc(size);
+    if (!buffer) {
+        printf("error: decodeMP3 not enough memory\n");
+        return -1;
+    }
+    mp3dec_f32_to_s16(info.buffer, buffer, info.samples);
+    free(info.buffer);
+
+    *pcmData = (unsigned char*)buffer;
+    *pcmChannels = info.channels;
+    *pcmRate = info.hz;
+    *pcmSize = size;
+    return 0;
+}

cocos/audio/RDAudioMP3.h

@@ -0,0 +1,33 @@
+// Copyright 2021 KeNan Liu
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef __RDAudioMP3_H__
+#define __RDAudioMP3_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int decodeMP3(unsigned char *mp3Data,
+              int mp3Size,
+              unsigned char **pcmData,
+              int *pcmChannels,
+              int *pcmRate,
+              int *pcmSize);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __RDAudioMP3_H__

tests/src/app/views/Test_Audio.lua

@@ -60,6 +60,7 @@ function TestCase:ctor()
 			audio.loadFile("audio/bgm.ogg", loadedCB)
 			audio.loadFile("audio/effect.ogg", loadedCB)
 			audio.loadFile("audio/bgm.aac", loadedCB)
+			audio.loadFile("audio/effect.mp3", loadedCB)
 			btn:setVisible(false)
 		end
 	end)