diff --git a/profiles/audio/a2dp-codecs.h b/profiles/audio/a2dp-codecs.h
index 0f44b10..e2e1a77 100644
--- a/profiles/audio/a2dp-codecs.h
+++ b/profiles/audio/a2dp-codecs.h
@@ -85,6 +85,27 @@
 #define MPEG_BIT_RATE_32000		0x0002
 #define MPEG_BIT_RATE_FREE		0x0001
 
+#define AAC_OBJECT_TYPE_MPEG2_AAC_LC	0x80
+#define AAC_OBJECT_TYPE_MPEG4_AAC_LC	0x40
+#define AAC_OBJECT_TYPE_MPEG4_AAC_LTP	0x20
+#define AAC_OBJECT_TYPE_MPEG4_AAC_SCA	0x10
+
+#define AAC_SAMPLING_FREQ_8000		0x0800
+#define AAC_SAMPLING_FREQ_11025		0x0400
+#define AAC_SAMPLING_FREQ_12000		0x0200
+#define AAC_SAMPLING_FREQ_16000		0x0100
+#define AAC_SAMPLING_FREQ_22050		0x0080
+#define AAC_SAMPLING_FREQ_24000		0x0040
+#define AAC_SAMPLING_FREQ_32000		0x0020
+#define AAC_SAMPLING_FREQ_44100		0x0010
+#define AAC_SAMPLING_FREQ_48000		0x0008
+#define AAC_SAMPLING_FREQ_64000		0x0004
+#define AAC_SAMPLING_FREQ_88200		0x0002
+#define AAC_SAMPLING_FREQ_96000		0x0001
+
+#define AAC_CHANNELS_1			0x02
+#define AAC_CHANNELS_2			0x01
+
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 
 typedef struct {
@@ -107,6 +128,18 @@ typedef struct {
 	uint16_t bitrate;
 } __attribute__ ((packed)) a2dp_mpeg_t;
 
+typedef struct {
+	uint8_t object_type;
+	uint8_t frequency1;
+	uint8_t rfa:2;
+	uint8_t channels:2;
+	uint8_t frequency2:4;
+	uint8_t bitrate1:7;
+	uint8_t vbr:1;
+	uint8_t bitrate2;
+	uint8_t bitrate3;
+} __attribute__ ((packed)) a2dp_aac_t;
+
 #elif __BYTE_ORDER == __BIG_ENDIAN
 
 typedef struct {
@@ -129,6 +162,18 @@ typedef struct {
 	uint16_t bitrate;
 } __attribute__ ((packed)) a2dp_mpeg_t;
 
+typedef struct {
+	uint8_t object_type;
+	uint8_t frequency1;
+	uint8_t frequency2:4;
+	uint8_t channels:2;
+	uint8_t rfa:2;
+	uint8_t vbr:1;
+	uint8_t bitrate1:7;
+	uint8_t bitrate2;
+	uint8_t bitrate3;
+} __attribute__ ((packed)) a2dp_aac_t;
+
 #else
 #error "Unknown byte order"
 #endif