diff --git a/mpeg/psi/desc_03.h b/mpeg/psi/desc_03.h
new file mode 100644
index 0000000..860597b
--- /dev/null
+++ b/mpeg/psi/desc_03.h
@@ -0,0 +1,138 @@
+/*****************************************************************************
+ * desc_03.h: ISO/IEC 13818-1 Descriptor 0x03 (Audio stream descriptor)
+ *****************************************************************************
+ * Copyright (C) 2011 Unix Solutions Ltd.
+ *
+ * Authors: Georgi Chorbadzhiyski <georgi@unixsol.org>
+ *
+ * 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.
+ *****************************************************************************/
+
+/*
+ * Normative references:
+ *  - ISO/IEC 13818-1:2007(E) (MPEG-2 Systems)
+ */
+
+#ifndef __BITSTREAM_MPEG_DESC_03_H__
+#define __BITSTREAM_MPEG_DESC_03_H__
+
+#include <bitstream/common.h>
+#include <bitstream/mpeg/psi/descriptors.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/*****************************************************************************
+ * Descriptor 0x03: Audio stream descriptor
+ *****************************************************************************/
+#define DESC03_HEADER_SIZE      (DESC_HEADER_SIZE + 1)
+
+static inline void desc03_init(uint8_t *p_desc)
+{
+    desc_set_tag(p_desc, 0x03);
+    desc_set_length(p_desc, DESC03_HEADER_SIZE - DESC_HEADER_SIZE);
+    p_desc[2] = 0x07;
+}
+
+static inline bool desc03_validate(const uint8_t *p_desc)
+{
+    return desc_get_length(p_desc) >= DESC03_HEADER_SIZE - DESC_HEADER_SIZE;
+}
+
+static inline bool desc03_get_free_format_flag(const uint8_t *p_desc) {
+    return (p_desc[2] & 0x80) == 0x80;
+}
+
+static inline void desc03_set_free_format_flag(uint8_t *p_desc, bool b_free_format_flag) {
+    p_desc[2] = (b_free_format_flag ? (p_desc[2] | 0x80) : (p_desc[2] &~ 0x80));
+}
+
+static inline bool desc03_get_ID(const uint8_t *p_desc) {
+    return (p_desc[2] & 0x40) == 0x40;
+}
+
+static inline void desc03_set_ID(uint8_t *p_desc, bool b_id) {
+    p_desc[2] = (b_id ? (p_desc[2] | 0x40) : (p_desc[2] &~ 0x40));
+}
+
+static inline const char *desc03_get_ID_txt(const uint8_t ID) {
+    return ID ? "MPEG Audio" : "Other";
+}
+
+static inline uint8_t desc03_get_layer(const uint8_t *p_desc) {
+    return (p_desc[2] >> 4) & 0x03; /* xx11xxxx */
+}
+
+static inline void desc03_set_layer(uint8_t *p_desc, uint8_t i_layer) {
+    p_desc[2] = (p_desc[2] & 0xcf) | ((i_layer & 0x03) << 4);
+}
+
+static inline const char *desc03_get_layer_txt(const uint8_t layer) {
+    return layer == 0 ? "reserved" :
+           layer == 1 ? "Layer III" :
+           layer == 2 ? "Layer II" :
+           layer == 3 ? "Layer I" : "reserved";
+}
+
+static inline bool desc03_get_vbr_flag(const uint8_t *p_desc) {
+    return (p_desc[2] & 0x08) == 0x08;
+}
+
+static inline void desc03_set_vbr_flag(uint8_t *p_desc, bool b_free_format_flag) {
+    p_desc[2] = (b_free_format_flag ? (p_desc[2] | 0x08) : (p_desc[2] &~ 0x08));
+}
+
+static inline void desc03_print(const uint8_t *p_desc, f_print pf_print,
+                                void *opaque, print_type_t i_print_type)
+{
+    switch (i_print_type) {
+    case PRINT_XML:
+        pf_print(opaque,
+            "<AUDIO_STREAM_DESC free_format_tag=\"%u\" ID=\"%u\" layer=\"%u\""
+            " ID_txt=\"%s\" layer_txt=\"%s\" vbr_audio_flag=\"%u\"/>",
+                 desc03_get_free_format_flag(p_desc),
+                 desc03_get_ID(p_desc),
+                 desc03_get_layer(p_desc),
+                 desc03_get_ID_txt(desc03_get_ID(p_desc)),
+                 desc03_get_layer_txt(desc03_get_layer(p_desc)),
+                 desc03_get_vbr_flag(p_desc)
+        );
+        break;
+    default:
+        pf_print(opaque,
+            "    - desc 03 audio_stream free_format_tag=%u ID=%u layer=%u"
+            " ID_txt=\"%s\" layer_txt=\"%s\" vbr_audio_flag=%u",
+                 desc03_get_free_format_flag(p_desc),
+                 desc03_get_ID(p_desc),
+                 desc03_get_layer(p_desc),
+                 desc03_get_ID_txt(desc03_get_ID(p_desc)),
+                 desc03_get_layer_txt(desc03_get_layer(p_desc)),
+                 desc03_get_vbr_flag(p_desc)
+        );
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/mpeg/psi/descs_list.h b/mpeg/psi/descs_list.h
index 5951d18..84a5e43 100644
--- a/mpeg/psi/descs_list.h
+++ b/mpeg/psi/descs_list.h
@@ -35,6 +35,7 @@
  */
 
 #include <bitstream/mpeg/psi/desc_02.h>
+#include <bitstream/mpeg/psi/desc_03.h>
 #include <bitstream/mpeg/psi/desc_05.h>
 #include <bitstream/mpeg/psi/desc_09.h>
 #include <bitstream/mpeg/psi/desc_0a.h>
diff --git a/mpeg/psi/descs_print.h b/mpeg/psi/descs_print.h
index e5b65c0..f410082 100644
--- a/mpeg/psi/descs_print.h
+++ b/mpeg/psi/descs_print.h
@@ -101,6 +101,7 @@ static inline void descl_print(uint8_t *p_descl, uint16_t i_length,
             break;
 
         CASE_DESC(02)
+        CASE_DESC(03)
         CASE_DESC(05)
         CASE_DESC(09)
         CASE_DESC(0a)