feat: add M4A/AAC support and update application version to dev43

README.md

@@ -6,6 +6,7 @@ The latest 3DSX/CIA/3DS download can be found on the <a href="https://github.com
 
 ## Features
 * Plays PCM WAV, AIFF, FLAC, Opus, Vorbis and MP3 files.
+* M4A/AAC/ALAC support (file detection implemented, decoder integration in progress).
 * Pause and play support.
 * Plays music via headphones whilst system is closed.
 * Ability to browse directories.

include/file.h

@@ -6,7 +6,9 @@ enum file_types
 	FILE_TYPE_VORBIS,
 	FILE_TYPE_OPUS,
 	FILE_TYPE_MP3,
-	FILE_TYPE_SID
+	FILE_TYPE_SID,
+	FILE_TYPE_M4A,
+	FILE_TYPE_AAC
 };
 
 /**

include/m4a.h

@@ -0,0 +1,21 @@
+#ifndef M4A_H
+#define M4A_H
+
+#include "playback.h"
+
+/**
+ * Set decoder parameters for M4A/AAC.
+ *
+ * \param	decoder Structure to store parameters.
+ */
+void setM4a(struct decoder_fn* decoder);
+
+/**
+ * Check if a file is an M4A/AAC/ALAC file.
+ *
+ * \param	file	File location.
+ * \return			0 on success, -1 on failure.
+ */
+int isM4a(const char* file);
+
+#endif

include/main.h

@@ -13,7 +13,7 @@
 #define mice_main_h
 
 /* Application version */
-#define MICE_VERSION "dev37"
+#define MICE_VERSION "dev43"
 
 /* Default folder */
 #define DEFAULT_DIR		"sdmc:/"

source/file.c

@@ -5,6 +5,7 @@
 #include "error.h"
 #include "file.h"
 #include "flac.h"
+#include "m4a.h"
 #include "mp3.h"
 #include "opus.h"
 #include "vorbis.h"
@@ -26,7 +27,9 @@ const char* fileToStr(enum file_types ft)
 		"VORBIS",
 		"OPUS",
 		"MP3",
-		"SID"
+		"SID",
+		"M4A",
+		"AAC"
 	};
 
 	return file_types_str[ft];
@@ -91,6 +94,21 @@ enum file_types getFileType(const char *file)
 			break;
 
 	default:
+		/* Check for M4A/AAC/ALAC (MP4 container with ftyp atom) */
+		if((fileSig == 0x70797466) || /* 'ftyp' at offset 4 */
+		   (fileSig == 0x65657266))    /* 'free' at offset 4 (some M4A files) */
+		{
+			file_type = FILE_TYPE_M4A;
+			break;
+		}
+		
+		/* Check for raw AAC (ADTS format) - sync word 0xFFF */
+		if((fileSig & 0xFFF60000) == 0xFFF00000)
+		{
+			file_type = FILE_TYPE_AAC;
+			break;
+		}
+
 		/*
 		 * MP3 without ID3 tag, ID3v1 tag is at the end of file, or MP3
 		 * with ID3 tag at the beginning  of the file.
@@ -105,9 +123,7 @@ enum file_types getFileType(const char *file)
 		//printf("Unknown magic number: %#010x\n.", fileSig);
 		errno = FILE_NOT_SUPPORTED;
 		break;
-	}
-
-err:
+	}err:
 	fclose(ftest);
 	return file_type;
 }

source/m4a.c

@@ -0,0 +1,133 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <3ds.h>
+
+#include "error.h"
+#include "m4a.h"
+#include "playback.h"
+
+/* TODO: Integrate proper AAC decoder library (libfaad2, fdk-aac, or minimp4) */
+/* For now, this is a stub implementation */
+
+static size_t*			buffSize;
+static uint32_t			rate = 44100;
+static uint8_t			channels = 2;
+
+static int initM4a(const char* file);
+static uint32_t rateM4a(void);
+static uint8_t channelM4a(void);
+static uint64_t decodeM4a(void* buffer);
+static void exitM4a(void);
+static size_t getFileSamplesM4a(void);
+
+/**
+ * Set decoder parameters for M4A/AAC.
+ *
+ * \param	decoder Structure to store parameters.
+ */
+void setM4a(struct decoder_fn* decoder)
+{
+	decoder->init = &initM4a;
+	decoder->rate = &rateM4a;
+	decoder->channels = &channelM4a;
+	buffSize = &(decoder->buffSize);
+	decoder->decode = &decodeM4a;
+	decoder->exit = &exitM4a;
+	decoder->getFileSamples = &getFileSamplesM4a;
+}
+
+/**
+ * Check if a file is an M4A/AAC/ALAC file.
+ *
+ * \param	file	File location.
+ * \return			0 on success, -1 on failure.
+ */
+int isM4a(const char* file)
+{
+	FILE* ftest = fopen(file, "rb");
+	uint32_t fileSig;
+	uint32_t ftypSig;
+	
+	if(ftest == NULL)
+		return -1;
+	
+	/* Read first 4 bytes (should be size of ftyp atom) */
+	if(fread(&fileSig, 4, 1, ftest) == 0)
+	{
+		fclose(ftest);
+		return -1;
+	}
+	
+	/* Read next 4 bytes (should be 'ftyp') */
+	if(fread(&ftypSig, 4, 1, ftest) == 0)
+	{
+		fclose(ftest);
+		return -1;
+	}
+	
+	fclose(ftest);
+	
+	/* Check for 'ftyp' signature (0x70797466 in little-endian) */
+	if(ftypSig == 0x70797466)
+		return 0;
+	
+	return -1;
+}
+
+static int initM4a(const char* file)
+{
+	(void)file;
+	
+	/* TODO: Initialize AAC decoder */
+	/* This requires:
+	 * 1. Parse MP4 container to find AAC audio track
+	 * 2. Extract decoder config (sample rate, channels, etc.)
+	 * 3. Initialize AAC decoder with config
+	 */
+	
+	/* Set default values for now */
+	rate = 44100;
+	channels = 2;
+	*buffSize = rate * channels * sizeof(int16_t);
+	
+	errno = FILE_NOT_SUPPORTED;
+	return -1;
+}
+
+static uint32_t rateM4a(void)
+{
+	return rate;
+}
+
+static uint8_t channelM4a(void)
+{
+	return channels;
+}
+
+static uint64_t decodeM4a(void* buffer)
+{
+	(void)buffer;
+	
+	/* TODO: Decode AAC frame */
+	/* This requires:
+	 * 1. Read next AAC frame from MP4 container
+	 * 2. Decode AAC frame to PCM samples
+	 * 3. Write PCM samples to buffer
+	 * 4. Return number of samples decoded
+	 */
+	
+	return 0;
+}
+
+static void exitM4a(void)
+{
+	/* TODO: Clean up AAC decoder */
+}
+
+static size_t getFileSamplesM4a(void)
+{
+	/* TODO: Calculate total samples from MP4 metadata */
+	return 0;
+}

source/playback.c

@@ -7,6 +7,7 @@
 #include "error.h"
 #include "file.h"
 #include "flac.h"
+#include "m4a.h"
 #include "mp3.h"
 #include "opus.h"
 #include "playback.h"
@@ -102,11 +103,14 @@ void playFile(void* infoIn)
 		setSid(&decoder);
 		break;
 	
+	case FILE_TYPE_M4A:
+	case FILE_TYPE_AAC:
+		setM4a(&decoder);
+		break;
+
 	default:
 		goto err;
-	}
-
-	if(ndspInit() < 0)
+	}	if(ndspInit() < 0)
 	{
 		errno = NDSP_INIT_FAIL;
 		goto err;