From 63c8cb6ec9ec5d1fb954a37f53dbc532bb762ba8 Mon Sep 17 00:00:00 2001
From: Rumaan Khan <100922@ittiam.com>
Date: Thu, 26 Jun 2025 17:55:06 +0530
Subject: [PATCH 1/3] mp4 supp changes

---
 test/decoder/ixheaacd_main.c | 455 +++++++++++++++++++++++++++++++++--
 test/decoder/xaacdec.cmake   |  27 ++-
 2 files changed, 465 insertions(+), 17 deletions(-)

diff --git a/test/decoder/ixheaacd_main.c b/test/decoder/ixheaacd_main.c
index b7e6c8c..a96cf0e 100644
--- a/test/decoder/ixheaacd_main.c
+++ b/test/decoder/ixheaacd_main.c
@@ -33,6 +33,16 @@
 #include "ixheaacd_metadata_read.h"
 #include "impd_drc_config_params.h"
 
+#ifdef SUPPORT_MP4
+#include "ISOMovies.h"
+#define _IA_HANDLE_ERROR_MP4(a)                               \
+if (a)                                                        \
+{                                                             \
+  printf("ISOBMFF parser library error. Error No: %d\n", a);  \
+  exit(1);                                                    \
+}
+#endif
+
 IA_ERRORCODE ixheaacd_dec_api(pVOID p_ia_module_obj, WORD32 i_cmd, WORD32 i_idx,
                               pVOID pv_value);
 
@@ -100,13 +110,23 @@ FileWrapperPtr g_pf_inp; /* file pointer to bitstream file (mp4) */
 
 WORD32 mpeg_d_drc_on = 0;
 
+#ifndef SUPPORT_MP4
 metadata_info meta_info;  // metadata pointer;
 WORD32 ixheaacd_i_bytes_to_read;
-WORD32 prev_i_bytes_to_read;
-WORD32 flush_frame = 0;
 FILE *g_pf_meta;
 
 WORD32 raw_testing = 0;
+#else
+WORD32 mp4_flag = 0;
+WORD32 ixheaacd_i_bytes_to_read;
+ISOMedia media;
+ISOTrack trak;
+ISOTrackReader reader;
+ISOHandle sample_hdl;
+ISOHandle decoder_cfg_hdl;
+#endif
+WORD32 prev_i_bytes_to_read;
+WORD32 flush_frame = 0;
 WORD32 eld_testing = 0;
 WORD32 ec_enable = 0;
 WORD32 esbr_testing = 1;
@@ -387,6 +407,7 @@ IA_ERRORCODE ixheaacd_set_config_param(WORD32 argc, pWORD8 argv[],
   ia_error_info_struct *p_proc_err_info = &ixheaacd_error_info;
 
   for (i = 0; i < argc; i++) {
+#ifndef SUPPORT_MP4
     /* To indicate if its a MP4 file or not. */
     if (!strncmp((pCHAR8)argv[i], "-mp4:", 5)) {
       pCHAR8 pb_arg_val = (pCHAR8)(argv[i] + 5);
@@ -396,6 +417,7 @@ IA_ERRORCODE ixheaacd_set_config_param(WORD32 argc, pWORD8 argv[],
           IA_XHEAAC_DEC_CONFIG_PARAM_MP4FLAG, &ui_mp4_flag);
       _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
     }
+#endif
     /* PCM WORD Size (For single input file) */
     if (!strncmp((pCHAR8)argv[i], "-pcmsz:", 7)) {
       pCHAR8 pb_arg_val = (pCHAR8)(argv[i] + 7);
@@ -668,6 +690,15 @@ IA_ERRORCODE ixheaacd_set_config_param(WORD32 argc, pWORD8 argv[],
       ec_enable = ui_err_conceal;
     }
   }
+#ifdef SUPPORT_MP4
+  {
+    UWORD32 ui_mp4_flag = mp4_flag;
+    err_code = (*p_ia_process_api)(
+        p_ia_process_api_obj, IA_API_CMD_SET_CONFIG_PARAM,
+        IA_ENHAACPLUS_DEC_CONFIG_PARAM_ISMP4, &ui_mp4_flag);
+    _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+  }
+#endif
 
   return IA_NO_ERROR;
 }
@@ -872,6 +903,11 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
   WORD32 prev_sampling_rate = 0;
   WORD32 skip_samples = 0;
   WORD32 total_samples = 0;
+#ifdef SUPPORT_MP4
+  s64 segment_duration = 0;
+  s64 start_offset_duration = 0;
+  u32 entryIndex = 1;
+#endif
   WORD32 write_flag = 1;
   WORD32 bytes_to_write = 0;
   WORD32 ixheaacd_drc_offset = 0;
@@ -920,6 +956,10 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
   /* The process error info structure */
   ia_error_info_struct *p_proc_err_info;
 
+#ifdef SUPPORT_MP4
+  ISOErr err = ISONoErr;
+#endif
+
   /* Process struct initing */
   p_ia_process_api = ixheaacd_dec_api;
   p_set_config_param = ixheaacd_set_config_param;
@@ -1197,6 +1237,7 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
   do {
     i_bytes_read = 0;
 
+#ifndef SUPPORT_MP4
     if ((ui_inp_size - (i_buff_size - i_bytes_consumed)) > 0) {
       for (i = 0; i < (i_buff_size - i_bytes_consumed); i++) {
         pb_inp_buf[i] = pb_inp_buf[i + i_bytes_consumed];
@@ -1259,8 +1300,72 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
 #endif
       return 1;
     }
+#else
+    if (!mp4_flag)
+    {
+      if ((ui_inp_size - (i_buff_size - i_bytes_consumed)) > 0) {
+        for (i = 0; i < (i_buff_size - i_bytes_consumed); i++) {
+          pb_inp_buf[i] = pb_inp_buf[i + i_bytes_consumed];
+        }
 
+        FileWrapper_Read(g_pf_inp, (unsigned char *)(pb_inp_buf + i_buff_size -
+                                                     i_bytes_consumed),
+                         (ui_inp_size - (i_buff_size - i_bytes_consumed)),
+                         (pUWORD32)&i_bytes_read);
+
+        i_buff_size = i_buff_size - (i_bytes_consumed - i_bytes_read);
+
+        /* Tell input is over, if algorithm returns with insufficient input and
+           there is no
+               more input left in the bitstream*/
+        if ((i_buff_size <= 0) ||
+            ((err_code_reinit == 0x00001804) && i_bytes_read == 0))
+        {
+          i_buff_size = 0;
+          /* Tell that the input is over in this buffer */
+          err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
+                                         IA_API_CMD_INPUT_OVER, 0, NULL);
+          _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+        }
+      }
+
+      if ((i_buff_size <= 0) ||
+          ((err_code_reinit == 0x00001804) && i_bytes_read == 0)) {
+        i_buff_size = 0;
+        /* Tell that the input is over in this buffer */
+        err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
+                                       IA_API_CMD_INPUT_OVER, 0, NULL);
+        _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+#ifdef WAV_HEADER
+#ifndef ARM_PROFILE_BOARD
+        /* ******************************************************************/
+        /* Get config params from API                                       */
+        /* ******************************************************************/
+
+        err_code =
+            (*p_get_config_param)(pv_ia_process_api_obj, &i_samp_freq,
+                                &i_num_chan, &i_pcm_wd_sz, &i_channel_mask,
+                                &i_sbr_mode, &ui_aot);
+        _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+
+        // This is done in those cases, where file decodes ends at init time
+        // Since init is incomplete, sampling freq might be zero and will result
+        // in
+        // writing invalid wave header
+
+        if (i_samp_freq == 0) i_samp_freq = prev_sampling_rate;
+
+        if (!fseek(g_pf_out, 0, SEEK_SET))
+          write_wav_header(g_pf_out, i_total_bytes, i_samp_freq, i_num_chan,
+                           i_pcm_wd_sz, i_channel_mask);
+#endif
+#endif
+        return 1;
+      }
+    }
+#endif
     if (init_iteration == 1) {
+#ifndef SUPPORT_MP4
       if (raw_testing)
         ixheaacd_i_bytes_to_read = get_metadata_dec_info_init(meta_info);
       else
@@ -1271,8 +1376,52 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
           (*p_ia_process_api)(pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES,
                               0, &ixheaacd_i_bytes_to_read);
       init_iteration++;
+#else
+      if (!mp4_flag)
+      {
+        ixheaacd_i_bytes_to_read = i_buff_size;
+        /* Set number of bytes to be processed */
+        err_code =
+            (*p_ia_process_api)(pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES,
+                                0, &ixheaacd_i_bytes_to_read);
+      }
+      else
+      {
+        u32 samp_desc_idx = 1, obj_type = 0, output_size;
+        u32 avg_br = 0, max_br = 0, strm_type = 0, strm_up = 0;
+        err = MP4GetMediaDecoderInformation(media,
+            samp_desc_idx,
+            &obj_type,
+            &strm_type,
+            &output_size,
+            &strm_up,
+            &max_br,
+            &avg_br,
+            decoder_cfg_hdl);
+        _IA_HANDLE_ERROR_MP4(err);
+        err = MP4GetHandleSize(decoder_cfg_hdl, &ixheaacd_i_bytes_to_read);
+        _IA_HANDLE_ERROR_MP4(err);
+        if (ixheaacd_i_bytes_to_read > (WORD32)ui_inp_size)
+          return IA_FATAL_ERROR;
+        /* Set number of bytes to be processed */
+        err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
+                                       IA_API_CMD_SET_INPUT_BYTES, 0,
+                                       &ixheaacd_i_bytes_to_read);
+        memcpy(pb_inp_buf, *decoder_cfg_hdl, ixheaacd_i_bytes_to_read);
 
+        if (ixheaacd_i_bytes_to_read <= 0) {
+          err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
+                                         IA_API_CMD_INPUT_OVER, 0, NULL);
+
+          _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+
+          return IA_NO_ERROR;
+        }
+      }
+      init_iteration++;
+#endif
     } else {
+#ifndef SUPPORT_MP4
       if (raw_testing) {
         ixheaacd_i_bytes_to_read =
             get_metadata_dec_exec(meta_info, frame_counter);
@@ -1299,6 +1448,44 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
         err_code = (*p_ia_process_api)(
             pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES, 0, &i_buff_size);
       }
+#else
+      if (mp4_flag) {
+        u32 unit_size;
+        s32 cts;
+        s32 dts;
+        u32 sample_flags;
+        err = MP4TrackReaderGetNextAccessUnit(
+              reader, sample_hdl, &unit_size, &sample_flags, &cts, &dts);
+        if (err)
+        {
+          if (err == ISOEOF) err = ISONoErr;
+            break;
+        }
+        ixheaacd_i_bytes_to_read = unit_size;
+        i_bytes_read = ixheaacd_i_bytes_to_read;
+        if (ixheaacd_i_bytes_to_read > (WORD32)ui_inp_size)
+          return IA_FATAL_ERROR;
+
+        if (ixheaacd_i_bytes_to_read <= 0) {
+          err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
+                                         IA_API_CMD_INPUT_OVER, 0, NULL);
+
+          _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+          return IA_NO_ERROR;
+        }
+
+        /* Set number of bytes to be processed */
+        err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
+                                       IA_API_CMD_SET_INPUT_BYTES, 0,
+                                       &ixheaacd_i_bytes_to_read);
+        memcpy(pb_inp_buf, *((char **)sample_hdl), ixheaacd_i_bytes_to_read);
+        init_iteration++;
+      } else {
+        /* Set number of bytes to be processed */
+        err_code = (*p_ia_process_api)(
+            pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES, 0, &i_buff_size);
+      }
+#endif
     }
 
     _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
@@ -1646,6 +1833,7 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
   if (ui_aot == 42)
     esbr_testing = 1;
 
+#ifndef SUPPORT_MP4
   if (raw_testing) {
     skip_samples = get_start_offset_in_samples(meta_info);
     if (ui_aot >= 23 && esbr_testing) {
@@ -1656,6 +1844,21 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
     }
     if (eld_testing == 0) total_samples = get_play_time_in_samples(meta_info);
   }
+#else
+  if (mp4_flag) {
+    u32 entry_count = 1;
+    err = ISOGetTrackEditlistEntryCount(trak, &entry_count);
+    if (err == MP4NoErr)
+    {
+      err = ISOGetTrackEditlist(trak, &segment_duration, &start_offset_duration, 1);
+      if (err == MP4NoErr)
+      {
+        skip_samples = (WORD32)start_offset_duration;
+        if (eld_testing == 0) total_samples = (WORD32)segment_duration;
+      }
+    }
+  }
+#endif
 
 /* End second part */
 
@@ -1672,26 +1875,67 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
 #endif
   prev_sampling_rate = i_samp_freq;
 
+#if SUPPORT_MP4
+  UWORD32 number_of_frames = 0;
+  err = ISOGetMediaSampleCount(media, &number_of_frames);
+  if (err) return err;
+#else
+  UWORD32 number_of_frames = meta_info.ia_mp4_stsz_entries;
+#endif
+
   do {
     if (((WORD32)ui_inp_size - (WORD32)(i_buff_size - i_bytes_consumed)) > 0) {
       if (i_sbr_mode && (ui_aot < 23) && esbr_testing) {
-        if (meta_info.ia_mp4_stsz_entries != frame_counter) {
+        if (number_of_frames != frame_counter) {
           for (i = 0; i < (i_buff_size - i_bytes_consumed); i++) {
             pb_inp_buf[i] = pb_inp_buf[i + i_bytes_consumed];
           }
-
+#ifndef SUPPORT_MP4
           FileWrapper_Read(
               g_pf_inp,
               (unsigned char *)(pb_inp_buf + i_buff_size - i_bytes_consumed),
               ((WORD32)ui_inp_size - (WORD32)(i_buff_size - i_bytes_consumed)),
               (pUWORD32)&i_bytes_read);
-
+#else
+          if (!mp4_flag)
+          {
+            FileWrapper_Read(
+                g_pf_inp,
+                (unsigned char *)(pb_inp_buf + i_buff_size - i_bytes_consumed),
+                ((WORD32)ui_inp_size - (WORD32)(i_buff_size - i_bytes_consumed)),
+                (pUWORD32)&i_bytes_read);
+          }
+          else
+          {
+            if (i_bytes_consumed)
+            {
+              u32 unit_size;
+              s32 cts;
+              s32 dts;
+              u32 sample_flags;
+              err = MP4TrackReaderGetNextAccessUnit(
+                  reader, sample_hdl, &unit_size, &sample_flags, &cts, &dts);
+              if (err)
+              {
+                if (err == ISOEOF) err = ISONoErr;
+                break;
+              }
+              i_bytes_read = unit_size;
+              memcpy(pb_inp_buf, *((char **)sample_hdl), i_bytes_read);
+            }
+          }
+#endif
+		  
           i_buff_size = i_buff_size - (i_bytes_consumed - i_bytes_read);
 
           if ((i_buff_size <= 0) ||
               ((err_code_reinit == 0x00001804) && i_bytes_read == 0)) {
             i_buff_size = 0;
+#ifndef SUPPORT_MP4
             raw_testing = 0;
+#else
+            mp4_flag = 0;
+#endif
             /* Tell that the input is over in this buffer */
             err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
                                            IA_API_CMD_INPUT_OVER, 0, NULL);
@@ -1703,19 +1947,49 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
         for (i = 0; i < (i_buff_size - i_bytes_consumed); i++) {
           pb_inp_buf[i] = pb_inp_buf[i + i_bytes_consumed];
         }
-
+#ifndef SUPPORT_MP4
         FileWrapper_Read(g_pf_inp, (unsigned char *)(pb_inp_buf + i_buff_size -
             i_bytes_consumed),
             ((WORD32)ui_inp_size - (WORD32)(i_buff_size - i_bytes_consumed)),
             (pUWORD32)&i_bytes_read);
-
+#else
+        if (!mp4_flag)
+        {
+          FileWrapper_Read(g_pf_inp,
+                (unsigned char *)(pb_inp_buf + i_buff_size - i_bytes_consumed),
+                ((WORD32)ui_inp_size - (WORD32)(i_buff_size - i_bytes_consumed)),
+                (pUWORD32)&i_bytes_read);
+        }
+        else
+        {
+          if (i_bytes_consumed)
+          {
+            u32 unit_size;
+            s32 cts;
+            s32 dts;
+            u32 sample_flags;
+            err = MP4TrackReaderGetNextAccessUnit(
+                  reader, sample_hdl, &unit_size, &sample_flags, &cts, &dts);
+            if (err)
+            {
+              if (err == ISOEOF) err = ISONoErr;
+                break;
+            }
+            i_bytes_read = unit_size;
+            memcpy(pb_inp_buf, *((char **)sample_hdl), i_bytes_read);
+          }
+        }
+#endif
         i_buff_size = i_buff_size - (i_bytes_consumed - i_bytes_read);
 
         if ((i_buff_size <= 0) ||
             ((err_code_reinit == 0x00001804) && i_bytes_read == 0)) {
           i_buff_size = 0;
+#ifndef SUPPORT_MP4
           raw_testing = 0;
-
+#else
+          mp4_flag = 0;
+#endif
           err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
               IA_API_CMD_INPUT_OVER, 0, NULL);
 
@@ -1724,7 +1998,8 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
       }
     }
     if (i_sbr_mode && (ui_aot < 23) && esbr_testing) {
-      if (meta_info.ia_mp4_stsz_entries != frame_counter) {
+      if (number_of_frames != frame_counter) {
+#ifndef SUPPORT_MP4
         if (raw_testing) {
           ixheaacd_i_bytes_to_read =
               get_metadata_dec_exec(meta_info, frame_counter);
@@ -1743,11 +2018,31 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
               (*p_ia_process_api)(pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES,
                   0, &ixheaacd_i_bytes_to_read);
         } else {
+#else
+        if (mp4_flag) {
+          ixheaacd_i_bytes_to_read = i_bytes_read;
+
+          if (ixheaacd_i_bytes_to_read > (WORD32)ui_inp_size)
+            return IA_FATAL_ERROR;
+          if (ixheaacd_i_bytes_to_read <= 0 && ec_enable == 0) {
+            err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
+                                           IA_API_CMD_INPUT_OVER, 0, NULL);
+
+            _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+
+            return IA_NO_ERROR;
+          }
+          err_code =
+              (*p_ia_process_api)(pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES,
+                  0, &ixheaacd_i_bytes_to_read);
+        } else {
+#endif
           err_code = (*p_ia_process_api)(
               pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES, 0, &i_buff_size);
         }
       }
     } else {
+#ifndef SUPPORT_MP4
     if (raw_testing) {
       ixheaacd_i_bytes_to_read =
           get_metadata_dec_exec(meta_info, frame_counter);
@@ -1778,6 +2073,37 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
                                          &ixheaacd_i_bytes_to_read);
         }
     } else {
+#else
+    if (mp4_flag) {
+      ixheaacd_i_bytes_to_read = i_bytes_read;
+
+      if (ixheaacd_i_bytes_to_read > (WORD32)ui_inp_size) return IA_FATAL_ERROR;
+
+      if (ixheaacd_i_bytes_to_read <= 0) {
+        err_code = (*p_ia_process_api)(pv_ia_process_api_obj,
+                                       IA_API_CMD_INPUT_OVER, 0, NULL);
+
+        _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+
+        return IA_NO_ERROR;
+      }
+
+      if (ec_enable == 1) {
+        if (ixheaacd_i_bytes_to_read != 0) {
+          err_code = (*p_ia_process_api)(pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES, 0,
+                                         &ixheaacd_i_bytes_to_read);
+        } else {
+          if (i_buff_size != 0) {
+            err_code = (*p_ia_process_api)(pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES, 0,
+                                           &i_buff_size);
+          }
+        }
+      } else {
+          err_code = (*p_ia_process_api)(pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES, 0,
+                                         &ixheaacd_i_bytes_to_read);
+      }
+    } else {
+#endif
       /* Set number of bytes to be processed */
       err_code = (*p_ia_process_api)(
           pv_ia_process_api_obj, IA_API_CMD_SET_INPUT_BYTES, 0, &i_buff_size);
@@ -2064,7 +2390,13 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
 
     if (total_samples != 0)  // Usac stream
     {
+#ifndef SUPPORT_MP4
       if (raw_testing) {
+#else
+      if (mp4_flag) {
+        WORD32 frame_size = i_out_bytes / (i_num_chan * (i_pcm_wd_sz >> 3));
+        skip_samples = skip_samples % frame_size;
+#endif
         if (i_total_bytes <= skip_samples * i_num_chan * (i_pcm_wd_sz >> 3)) {
           err_code =
               (*p_get_config_param)(pv_ia_process_api_obj, &i_samp_freq,
@@ -2088,6 +2420,7 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
         }
       }
 
+#ifndef SUPPORT_MP4
       if (raw_testing) {
         samples_written += current_samples;
 
@@ -2097,6 +2430,17 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
           if (i_out_bytes < 0) i_out_bytes = 0;
         }
       }
+#else
+      if (mp4_flag) {
+        samples_written += current_samples;
+
+        if (samples_written > total_samples) {
+          i_out_bytes = (total_samples - (samples_written - current_samples)) *
+                        (i_num_chan * (i_pcm_wd_sz >> 3));
+          if (i_out_bytes < 0) i_out_bytes = 0;
+        }
+      }
+#endif
     }
 
     if (write_flag) {
@@ -2326,10 +2670,17 @@ void print_usage() {
 int main(WORD32 argc, char *argv[]) {
   WORD32 i, err_code = IA_NO_ERROR;
 
+#ifdef SUPPORT_MP4
+  ISOErr err;
+  u32 handler_type;
+  ISOMovie moov;
+#endif
   ia_testbench_error_handler_init();
 
   g_pf_inp = NULL;
+#ifndef SUPPORT_MP4
   g_pf_meta = NULL;
+#endif
   g_pf_out = NULL;
 
   for (i = 1; i < argc; i++) {
@@ -2337,7 +2688,7 @@ int main(WORD32 argc, char *argv[]) {
 
     if (!strncmp((const char *)argv[i], "-ifile:", 7)) {
       pWORD8 pb_arg_val = (pWORD8)argv[i] + 7;
-
+#ifndef SUPPORT_MP4
       g_pf_inp = FileWrapper_Open((char *)pb_arg_val);
       if (g_pf_inp == NULL) {
         err_code = IA_TESTBENCH_MFMAN_FATAL_FILE_OPEN_FAILED;
@@ -2346,8 +2697,43 @@ int main(WORD32 argc, char *argv[]) {
         exit(1);
       }
       raw_testing = 0;
+#else
+      err = ISOOpenMovieFile(&moov, (char *)pb_arg_val,
+            MP4OpenMovieNormal);
+      if (err != MP4NoErr)
+      {
+        mp4_flag = 0;
+        g_pf_inp = FileWrapper_Open((char *)pb_arg_val);
+        if (g_pf_inp == NULL) {
+          err_code = IA_TESTBENCH_MFMAN_FATAL_FILE_OPEN_FAILED;
+          ixheaacd_error_handler(&ixheaacd_ia_testbench_error_info,
+                                 (pWORD8) "Input File", err_code);
+          exit(1);
+        }
+      }
+      else
+      {
+        u32 tot_num_tracks = 0;
+        mp4_flag = 1;
+        err = ISOGetMovieTrackCount(moov, &tot_num_tracks);
+        _IA_HANDLE_ERROR_MP4(err);
+        err = ISOGetMovieIndTrack(moov, tot_num_tracks, &trak);
+        _IA_HANDLE_ERROR_MP4(err);
+        err = ISOGetTrackMedia(trak, &media);
+        _IA_HANDLE_ERROR_MP4(err);
+        err = ISOGetMediaHandlerDescription(
+              media, &handler_type, NULL);
+        _IA_HANDLE_ERROR_MP4(err);
+        err = ISONewHandle(0, &decoder_cfg_hdl);
+        _IA_HANDLE_ERROR_MP4(err);
+        err = ISONewHandle(0, &sample_hdl);
+        _IA_HANDLE_ERROR_MP4(err);
+        err = ISOCreateTrackReader(trak, &reader);
+        _IA_HANDLE_ERROR_MP4(err);
+      }
+#endif
     }
-
+#ifndef SUPPORT_MP4
     if (!strncmp((const char *)argv[i], "-imeta:", 7)) {
       pWORD8 pb_arg_val = (pWORD8)argv[i] + 7;
 
@@ -2367,6 +2753,7 @@ int main(WORD32 argc, char *argv[]) {
       }
       raw_testing = 1;
     }
+#endif
 
     if (!strncmp((const char *)argv[i], "-ofile:", 7)) {
       pWORD8 pb_arg_val = (pWORD8)argv[i] + 7;
@@ -2381,6 +2768,7 @@ int main(WORD32 argc, char *argv[]) {
     }
   }
 
+#ifndef SUPPORT_MP4
   if ((g_pf_inp == NULL) || (g_pf_out == NULL)) {
     print_usage();
     err_code = IA_TESTBENCH_MFMAN_FATAL_FILE_OPEN_FAILED;
@@ -2388,11 +2776,33 @@ int main(WORD32 argc, char *argv[]) {
                            (pWORD8) "Input or Output File", err_code);
     exit(1);
   }
+#else
+  if (!mp4_flag)
+  {
+    if ((g_pf_inp == NULL) || (g_pf_out == NULL)) {
+      print_usage();
+      err_code = IA_TESTBENCH_MFMAN_FATAL_FILE_OPEN_FAILED;
+      ixheaacd_error_handler(&ixheaacd_ia_testbench_error_info,
+                             (pWORD8) "Input or Output File", err_code);
+      exit(1);
+    }
+  }
+  else
+  {
+    if (g_pf_out == NULL) {
+      print_usage();
+      err_code = IA_TESTBENCH_MFMAN_FATAL_FILE_OPEN_FAILED;
+      ixheaacd_error_handler(&ixheaacd_ia_testbench_error_info,
+                             (pWORD8) "Output File", err_code);
+      exit(1);
+    }
+  }
+#endif
 
   g_w_malloc_count = 0;
 
   printf("\n");
-
+#ifndef SUPPORT_MP4
   for (i = 0; i < argc; i++) {
     if (!strcmp((pCHAR8)argv[i], "-mp4:1")) {
       if (g_pf_meta == NULL) {
@@ -2404,7 +2814,7 @@ int main(WORD32 argc, char *argv[]) {
       }
     }
   }
-
+#endif
   for (i = 0; i < argc; i++) {
     if (strcmp((pCHAR8)argv[i], "-eld_testing:1"))
       eld_testing = 0;
@@ -2420,12 +2830,29 @@ int main(WORD32 argc, char *argv[]) {
     if (g_pv_arr_alloc_memory[i]) free(g_pv_arr_alloc_memory[i]);
   }
   if (g_pf_out) fclose(g_pf_out);
-
+#ifndef SUPPORT_MP4
   if (g_pf_meta) {
     fclose(g_pf_meta);
     metadata_mp4_stsz_size_free(&meta_info);
   }
   FileWrapper_Close(g_pf_inp);
+#else
+  if (!mp4_flag)
+  {
+    FileWrapper_Close(g_pf_inp);
+  }
+  else
+  {
+    err = ISODisposeHandle(sample_hdl);
+    _IA_HANDLE_ERROR_MP4(err);
+    err = ISODisposeHandle(decoder_cfg_hdl);
+    _IA_HANDLE_ERROR_MP4(err);
+    err = ISODisposeTrackReader(reader);
+    _IA_HANDLE_ERROR_MP4(err);
+    err = ISODisposeMovie(moov);
+    _IA_HANDLE_ERROR_MP4(err);
+  }
+#endif
   mpeg_d_drc_on = 0;
 
   return IA_NO_ERROR;
diff --git a/test/decoder/xaacdec.cmake b/test/decoder/xaacdec.cmake
index 51f8fed..608760f 100644
--- a/test/decoder/xaacdec.cmake
+++ b/test/decoder/xaacdec.cmake
@@ -5,23 +5,44 @@ list(APPEND XAACDEC_SRCS "${XAAC_ROOT}/test/decoder/ixheaacd_error.c"
 set(LIBXAACDEC_INCLUDES ${XAAC_ROOT}/decoder ${XAAC_ROOT}/test/decoder/
                         ${XAAC_ROOT}/decoder/drc_src)
 
-include_directories(${LIBXAACDEC_INCLUDES})
+if(SUPPORT_MP4)
+  set(LIBISOMEDIA_INCLUDES $(XAAC_ROOT)/../isobmff/IsoLib/libisomediafile/src)
+
+  set(LIBISOOSW32_INCLUDES $(XAAC_ROOT)/../isobmff/IsoLib/libisomediafile/w32)
+
+  include_directories(${LIBXAACDEC_INCLUDES} ${LIBISOMEDIA_INCLUDES} ${LIBISOOSW32_INCLUDES})
+else()
+  include_directories(${LIBXAACDEC_INCLUDES})
+endif()
 
 libxaac_add_executable(xaacdec libxaacdec SOURCES ${XAACDEC_SRCS} INCLUDES
                        ${LIBXAACDEC_INCLUDES})
 
+if(SUPPORT_MP4)
+  include_external_msproject(libisomediafile
+      ${XAAC_ROOT}/../isobmff/build/IsoLib/libisomediafile/libisomediafile.vcxproj)
+
+  add_dependencies(xaacdec libisomediafile)
+endif()
+
+set(COMMON_FLAGS "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32")
+
+if(SUPPORT_MP4)
+  set(MP4_FLAG "-DSUPPORT_MP4")
+endif()
+
 if(MSVC)
   set_target_properties(
     xaacdec
     PROPERTIES
       COMPILE_FLAGS
-      "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32 -D_CRT_SECURE_NO_WARNINGS"
+      "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32 -D_CRT_SECURE_NO_WARNINGS ${MP4_FLAG}"
   )
 else()
   set_target_properties(
     xaacdec
     PROPERTIES
       COMPILE_FLAGS
-      "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32"
+      "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32 ${MP4_FLAG}"
   )
 endif()

From bc0609771de6028bac0e6b24b19ea9dcd0349bf6 Mon Sep 17 00:00:00 2001
From: Rumaan Khan <100922@ittiam.com>
Date: Tue, 1 Jul 2025 15:56:13 +0530
Subject: [PATCH 2/3] add supp for linux

---
 test/decoder/xaacdec.cmake | 54 +++++++++++++++++++++++++++-----------
 1 file changed, 38 insertions(+), 16 deletions(-)

diff --git a/test/decoder/xaacdec.cmake b/test/decoder/xaacdec.cmake
index 608760f..26307bf 100644
--- a/test/decoder/xaacdec.cmake
+++ b/test/decoder/xaacdec.cmake
@@ -1,48 +1,70 @@
-list(APPEND XAACDEC_SRCS "${XAAC_ROOT}/test/decoder/ixheaacd_error.c"
-     "${XAAC_ROOT}/test/decoder/ixheaacd_fileifc.c" "${XAAC_ROOT}/test/decoder/ixheaacd_main.c"
-     "${XAAC_ROOT}/test/decoder/ixheaacd_metadata_read.c")
+list(APPEND XAACDEC_SRCS
+  "${XAAC_ROOT}/test/decoder/ixheaacd_error.c"
+  "${XAAC_ROOT}/test/decoder/ixheaacd_fileifc.c"
+  "${XAAC_ROOT}/test/decoder/ixheaacd_main.c"
+  "${XAAC_ROOT}/test/decoder/ixheaacd_metadata_read.c"
+)
 
-set(LIBXAACDEC_INCLUDES ${XAAC_ROOT}/decoder ${XAAC_ROOT}/test/decoder/
-                        ${XAAC_ROOT}/decoder/drc_src)
+set(LIBXAACDEC_INCLUDES
+  ${XAAC_ROOT}/decoder
+  ${XAAC_ROOT}/test/decoder/
+  ${XAAC_ROOT}/decoder/drc_src
+)
 
 if(SUPPORT_MP4)
-  set(LIBISOMEDIA_INCLUDES $(XAAC_ROOT)/../isobmff/IsoLib/libisomediafile/src)
+  set(LIBISOMEDIA_INCLUDES "${XAAC_ROOT}/../isobmff/IsoLib/libisomediafile/src")
 
-  set(LIBISOOSW32_INCLUDES $(XAAC_ROOT)/../isobmff/IsoLib/libisomediafile/w32)
-
-  include_directories(${LIBXAACDEC_INCLUDES} ${LIBISOMEDIA_INCLUDES} ${LIBISOOSW32_INCLUDES})
+  # Platform-specific includes
+  if(MSVC)
+    set(LIBISOOSW32_INCLUDES "${XAAC_ROOT}/../isobmff/IsoLib/libisomediafile/w32")
+    include_directories(${LIBXAACDEC_INCLUDES} ${LIBISOMEDIA_INCLUDES} ${LIBISOOSW32_INCLUDES})
+  else()
+    set(LIBISOMEDIA_PLATFORM_INCLUDES ${XAAC_ROOT}/../isobmff/IsoLib/libisomediafile/linux)
+    include_directories(${LIBXAACDEC_INCLUDES} ${LIBISOMEDIA_INCLUDES} ${LIBISOMEDIA_PLATFORM_INCLUDES})
+  endif()
 else()
   include_directories(${LIBXAACDEC_INCLUDES})
 endif()
 
-libxaac_add_executable(xaacdec libxaacdec SOURCES ${XAACDEC_SRCS} INCLUDES
-                       ${LIBXAACDEC_INCLUDES})
+# Add xaacdec executable
+libxaac_add_executable(xaacdec libxaacdec SOURCES ${XAACDEC_SRCS} INCLUDES ${LIBXAACDEC_INCLUDES})
 
+# Platform-specific linking of MP4 library
 if(SUPPORT_MP4)
-  include_external_msproject(libisomediafile
-      ${XAAC_ROOT}/../isobmff/build/IsoLib/libisomediafile/libisomediafile.vcxproj)
+  if(MSVC)
+    # Use Visual Studio project on Windows
+    include_external_msproject(libisomediafile
+        ${XAAC_ROOT}/../isobmff/build/IsoLib/libisomediafile/libisomediafile.vcxproj)
 
-  add_dependencies(xaacdec libisomediafile)
+    add_dependencies(xaacdec libisomediafile)
+
+  else()
+    # Linux: link prebuilt static .a library
+    set(LIBISOMEDIA_LIB_PATH "${XAAC_ROOT}/../isobmff/lib/liblibisomediafile.a")
+    target_link_libraries(xaacdec ${LIBISOMEDIA_LIB_PATH})
+  endif()
 endif()
 
+# Common compile flags
 set(COMMON_FLAGS "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32")
 
 if(SUPPORT_MP4)
   set(MP4_FLAG "-DSUPPORT_MP4")
 endif()
 
+# Apply compile flags per platform
 if(MSVC)
   set_target_properties(
     xaacdec
     PROPERTIES
       COMPILE_FLAGS
-      "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32 -D_CRT_SECURE_NO_WARNINGS ${MP4_FLAG}"
+      "${COMMON_FLAGS} -D_CRT_SECURE_NO_WARNINGS ${MP4_FLAG}"
   )
 else()
   set_target_properties(
     xaacdec
     PROPERTIES
       COMPILE_FLAGS
-      "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32 ${MP4_FLAG}"
+      "${COMMON_FLAGS} ${MP4_FLAG}"
   )
 endif()

From ee7ac593ae15174bd66ec0ad854d9f3cd13be66a Mon Sep 17 00:00:00 2001
From: Akshay Ragir <100833@ittiam.com>
Date: Wed, 23 Jul 2025 10:56:30 +0530
Subject: [PATCH 3/3] WIP: Loudness leveling support for decoder

---
 cmake/utils.cmake                             |  1 +
 decoder/drc_src/impd_drc_api.c                |  8 +++-
 decoder/drc_src/impd_drc_api_struct_def.h     |  3 ++
 decoder/drc_src/impd_drc_common.h             |  3 ++
 decoder/drc_src/impd_drc_config_params.h      |  3 ++
 decoder/drc_src/impd_drc_dynamic_payload.c    | 40 +++++++++++++++++++
 decoder/drc_src/impd_drc_init.c               | 26 ++++++++----
 decoder/drc_src/impd_drc_interface.h          |  5 +++
 decoder/drc_src/impd_drc_interface_decoder.c  | 17 +++++---
 decoder/drc_src/impd_drc_parser.h             |  4 ++
 decoder/drc_src/impd_drc_selection_process.h  |  4 ++
 ...d_drc_selection_process_drcset_selection.c | 15 +++++++
 .../drc_src/impd_drc_selection_process_init.c |  8 ++++
 decoder/drc_src/impd_drc_static_payload.c     |  7 ++++
 decoder/drc_src/impd_drc_struct.h             |  3 ++
 decoder/ixheaacd_aac_config.h                 |  4 ++
 decoder/ixheaacd_api.c                        | 24 ++++++++++-
 decoder/ixheaacd_error_codes.h                |  5 ++-
 decoder/ixheaacd_struct_def.h                 |  3 ++
 fuzzer/xaac_dec_fuzzer.cpp                    | 13 ++++++
 test/decoder/impd_drc_config_params.h         |  4 +-
 test/decoder/ixheaacd_error.c                 | 14 ++++++-
 test/decoder/ixheaacd_main.c                  | 38 +++++++++++++++++-
 test/decoder/xaacdec.cmake                    |  2 +-
 24 files changed, 232 insertions(+), 22 deletions(-)

diff --git a/cmake/utils.cmake b/cmake/utils.cmake
index 922c8d0..5d9cd37 100644
--- a/cmake/utils.cmake
+++ b/cmake/utils.cmake
@@ -50,6 +50,7 @@ function(libxaac_add_definitions)
   elseif(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
     add_definitions(-DX86_64 -D_X86_64_)
   endif()
+  add_definitions(-DLOUDNESS_LEVELING_SUPPORT)
 endfunction()
 
 # Adds libraries needed for executables
diff --git a/decoder/drc_src/impd_drc_api.c b/decoder/drc_src/impd_drc_api.c
index 94ddccc..529d1a5 100644
--- a/decoder/drc_src/impd_drc_api.c
+++ b/decoder/drc_src/impd_drc_api.c
@@ -246,7 +246,7 @@ IA_ERRORCODE ia_drc_dec_api(pVOID p_ia_drc_dec_obj, WORD32 i_cmd, WORD32 i_idx,
     case IA_API_CMD_SET_CONFIG_PARAM: {
       switch (i_idx) {
         case IA_DRC_DEC_CONFIG_PARAM_SAMP_FREQ: {
-          if (*pus_value < 8000 || *pus_value > 96000) {
+          if (*pus_value <= 0 || *pus_value > 96000) {
             return IA_DRC_DEC_CONFIG_NON_FATAL_INVALID_SAMP_FREQ;
           }
           p_obj_drc->str_config.sampling_rate = *pus_value;
@@ -328,6 +328,12 @@ IA_ERRORCODE ia_drc_dec_api(pVOID p_ia_drc_dec_obj, WORD32 i_cmd, WORD32 i_idx,
           p_obj_drc->str_config.compress_set = 1;
           break;
         }
+#ifdef LOUDNESS_LEVELING_SUPPORT
+        case IA_DRC_DEC_CONFIG_DRC_LOUDNESS_LEVELING: {
+          p_obj_drc->str_config.loudness_leveling_flag = *pus_value;
+          break;
+        }
+#endif
         default: { return -1; }
       }
       break;
diff --git a/decoder/drc_src/impd_drc_api_struct_def.h b/decoder/drc_src/impd_drc_api_struct_def.h
index a753465..de1a637 100644
--- a/decoder/drc_src/impd_drc_api_struct_def.h
+++ b/decoder/drc_src/impd_drc_api_struct_def.h
@@ -63,6 +63,9 @@ typedef struct ia_drc_config_struct {
   WORD32 apply_crossfade;
   WORD32 is_config_changed;
   WORD32 ln_dbgain_prev;
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  WORD32 loudness_leveling_flag;
+#endif
 } ia_drc_config_struct;
 
 /* DRC bitsteam handler */
diff --git a/decoder/drc_src/impd_drc_common.h b/decoder/drc_src/impd_drc_common.h
index bf0f9dd..db57fe2 100644
--- a/decoder/drc_src/impd_drc_common.h
+++ b/decoder/drc_src/impd_drc_common.h
@@ -193,6 +193,9 @@ extern "C" {
 #define UNIDRCCONFEXT_V1 0x2
 #define UNIDRCLOUDEXT_EQ 0x1
 #define UNIDRCINTERFACEEXT_EQ 0x1
+#ifdef LOUDNESS_LEVELING_SUPPORT
+#define UNIDRCCONFEXT_LEVELING (0x4)
+#endif
 
 #define LOUD_EQ_REQUEST_OFF 0x0
 #define LOUD_EQ_REQUEST_LIGHT 0x1
diff --git a/decoder/drc_src/impd_drc_config_params.h b/decoder/drc_src/impd_drc_config_params.h
index b0d19c5..2bc6ab7 100644
--- a/decoder/drc_src/impd_drc_config_params.h
+++ b/decoder/drc_src/impd_drc_config_params.h
@@ -46,4 +46,7 @@
 #define IA_DRC_DEC_CONFIG_DRC_COMPRESS 0x0016
 #define IA_DRC_DEC_CONFIG_PARAM_APPLY_CROSSFADE 0x0017
 #define IA_DRC_DEC_CONFIG_PARAM_CONFIG_CHANGED 0x0018
+#ifdef LOUDNESS_LEVELING_SUPPORT
+#define IA_DRC_DEC_CONFIG_DRC_LOUDNESS_LEVELING 0x0019
+#endif
 #endif
diff --git a/decoder/drc_src/impd_drc_dynamic_payload.c b/decoder/drc_src/impd_drc_dynamic_payload.c
index 3c0cbb8..e005198 100644
--- a/decoder/drc_src/impd_drc_dynamic_payload.c
+++ b/decoder/drc_src/impd_drc_dynamic_payload.c
@@ -28,6 +28,10 @@
 #include "impd_drc_parser.h"
 #include "impd_drc_filter_bank.h"
 #include "impd_drc_rom.h"
+#ifdef LOUDNESS_LEVELING_SUPPORT
+#include "impd_drc_error_codes.h"
+#include "ixheaacd_error_codes.h"
+#endif
 WORD32 impd_parse_loud_eq_instructions(
     ia_bit_buf_struct* it_bit_buff,
     ia_loud_eq_instructions_struct* loud_eq_instructions);
@@ -646,6 +650,42 @@ WORD32 impd_parse_drc_ext_v1(ia_bit_buf_struct* it_bit_buff,
   return 0;
 }
 
+#ifdef LOUDNESS_LEVELING_SUPPORT
+IA_ERROR_CODE impd_leveling_instructions(ia_bit_buf_struct* it_bit_buff,
+                                         ia_drc_config* pstr_drc_config) {
+  WORD32 i;
+  IA_ERROR_CODE err = IA_NO_ERROR;
+  WORD32 drc_instruction_uni_drc_count = pstr_drc_config->drc_instructions_uni_drc_count;
+
+  for (i = 0; i < drc_instruction_uni_drc_count; ++i) {
+    if ((pstr_drc_config->str_drc_instruction_str[i].drc_set_effect & (1 << 11)) != 0) {
+      pstr_drc_config->str_drc_instruction_str[i].leveling_present =
+          impd_read_bits_buf(it_bit_buff, 1);
+
+      if (pstr_drc_config->str_drc_instruction_str[i].leveling_present) {
+        WORD32 ducking_only_drc_set_present = impd_read_bits_buf(it_bit_buff, 1);
+
+        if (ducking_only_drc_set_present) {
+          pstr_drc_config->drc_instructions_uni_drc_count++;
+
+          if (pstr_drc_config->drc_instructions_uni_drc_count > DRC_INSTRUCTIONS_COUNT_MAX) {
+            return IA_XHEAAC_DEC_INIT_NONFATAL_MAX_INSTRUCTIONS_ERROR;
+          }
+
+          err = impd_parse_drc_instructions_uni_drc(
+              it_bit_buff, 1, pstr_drc_config,
+              &pstr_drc_config
+                   ->str_drc_instruction_str[pstr_drc_config->drc_instructions_uni_drc_count -
+                                             1]);
+          if (err) return err;
+        }
+      }
+    }
+  }
+  return err;
+}
+#endif
+
 WORD32 impd_parse_filt_block(ia_bit_buf_struct* it_bit_buff,
                              ia_filt_block_struct* str_filter_block,
                              WORD32 block_count) {
diff --git a/decoder/drc_src/impd_drc_init.c b/decoder/drc_src/impd_drc_init.c
index 870b759..bc0af38 100644
--- a/decoder/drc_src/impd_drc_init.c
+++ b/decoder/drc_src/impd_drc_init.c
@@ -58,10 +58,15 @@ impd_drc_dec_interface_process(ia_bit_buf_struct *it_bit_buff,
                                WORD32 *num_bits_read);
 
 WORD32
-impd_drc_dec_interface_add_effect_type(
-    ia_drc_interface_struct *pstr_drc_interface, WORD32 drc_effect_type,
-    WORD32 target_loudness, WORD32 loud_norm, WORD32 album_mode, FLOAT32 boost,
-    FLOAT32 compress);
+impd_drc_dec_interface_add_effect_type(ia_drc_interface_struct *pstr_drc_interface,
+                                       WORD32 drc_effect_type, WORD32 target_loudness,
+                                       WORD32 loud_norm, WORD32 album_mode, FLOAT32 boost,
+                                       FLOAT32 compress
+#ifdef LOUDNESS_LEVELING_SUPPORT
+                                       ,
+                                       WORD32 loudness_leveling_flag
+#endif
+);
 
 #define BITSTREAM_FILE_FORMAT_SPLIT 1
 #define LIM_DEFAULT_THRESHOLD (0.89125094f)
@@ -411,10 +416,15 @@ IA_ERRORCODE impd_drc_init(ia_drc_api_struct *p_obj_drc) {
     p_obj_drc->str_config.compress = 1.0f;
 
   err_code = impd_drc_dec_interface_add_effect_type(
-      p_obj_drc->str_payload.pstr_drc_interface,
-      p_obj_drc->str_config.effect_type, p_obj_drc->str_config.target_loudness,
-      p_obj_drc->str_config.loud_norm_flag, p_obj_drc->str_config.album_mode,
-      p_obj_drc->str_config.boost, p_obj_drc->str_config.compress);
+      p_obj_drc->str_payload.pstr_drc_interface, p_obj_drc->str_config.effect_type,
+      p_obj_drc->str_config.target_loudness, p_obj_drc->str_config.loud_norm_flag,
+      p_obj_drc->str_config.album_mode, p_obj_drc->str_config.boost,
+      p_obj_drc->str_config.compress
+#ifdef LOUDNESS_LEVELING_SUPPORT
+      ,
+      p_obj_drc->str_config.loudness_leveling_flag
+#endif
+  );
 
   if (err_code != IA_NO_ERROR) return err_code;
 
diff --git a/decoder/drc_src/impd_drc_interface.h b/decoder/drc_src/impd_drc_interface.h
index a0e7039..c05ae3b 100644
--- a/decoder/drc_src/impd_drc_interface.h
+++ b/decoder/drc_src/impd_drc_interface.h
@@ -42,6 +42,11 @@ typedef struct {
 typedef struct {
   WORD32 interface_ext_count;
   ia_specific_interface_extension_struct specific_interface_ext[EXT_COUNT_MAX];
+
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  WORD32 loudness_leveling_on;
+#endif
+
   WORD32 loudness_eq_parameter_interface_flag;
   WORD32 eq_ctrl_interface_flag;
   ia_loudness_eq_parameter_interface_struct loudness_eq_parameter_interface;
diff --git a/decoder/drc_src/impd_drc_interface_decoder.c b/decoder/drc_src/impd_drc_interface_decoder.c
index 557ea2f..b7bd430 100644
--- a/decoder/drc_src/impd_drc_interface_decoder.c
+++ b/decoder/drc_src/impd_drc_interface_decoder.c
@@ -29,10 +29,15 @@
 #include "impd_drc_parser_interface.h"
 
 WORD32
-impd_drc_dec_interface_add_effect_type(
-    ia_drc_interface_struct* pstr_drc_interface, WORD32 drc_effect_type,
-    WORD32 target_loudness, WORD32 loud_norm, WORD32 album_mode, FLOAT32 boost,
-    FLOAT32 compress) {
+impd_drc_dec_interface_add_effect_type(ia_drc_interface_struct* pstr_drc_interface,
+                                       WORD32 drc_effect_type, WORD32 target_loudness,
+                                       WORD32 loud_norm, WORD32 album_mode, FLOAT32 boost,
+                                       FLOAT32 compress
+#ifdef LOUDNESS_LEVELING_SUPPORT
+                                       ,
+                                       WORD32 loudness_leveling_flag
+#endif
+) {
   WORD32 err = 0;
   WORD32 i = 0;
 
@@ -65,7 +70,9 @@ impd_drc_dec_interface_add_effect_type(
     }
     pstr_drc_interface->loudness_norm_ctrl_interface.target_loudness =
         (FLOAT32)target_loudness;
-
+#ifdef LOUDNESS_LEVELING_SUPPORT
+    pstr_drc_interface->drc_uni_interface_ext.loudness_leveling_on = loudness_leveling_flag;
+#endif
     pstr_drc_interface->loudness_norm_parameter_interface_flag = 1;
     pstr_drc_interface->loudness_norm_param_interface.album_mode = album_mode;
     pstr_drc_interface->loudness_norm_param_interface.peak_limiter = 0;
diff --git a/decoder/drc_src/impd_drc_parser.h b/decoder/drc_src/impd_drc_parser.h
index 75c548b..92018a0 100644
--- a/decoder/drc_src/impd_drc_parser.h
+++ b/decoder/drc_src/impd_drc_parser.h
@@ -73,6 +73,10 @@ impd_parse_drc_ext_v1(ia_bit_buf_struct* it_bit_buff,
                       ia_drc_config* drc_config,
                       ia_drc_config_ext* str_drc_config_ext);
 
+#ifdef LOUDNESS_LEVELING_SUPPORT
+WORD32 impd_leveling_instructions(ia_bit_buf_struct* it_bit_buff, ia_drc_config* pstr_drc_config);
+#endif
+
 WORD32
 impd_parse_drc_config(ia_bit_buf_struct* it_bit_buff,
                       ia_drc_params_bs_dec_struct* ia_drc_params_struct,
diff --git a/decoder/drc_src/impd_drc_selection_process.h b/decoder/drc_src/impd_drc_selection_process.h
index 4fdabe3..fba45e0 100644
--- a/decoder/drc_src/impd_drc_selection_process.h
+++ b/decoder/drc_src/impd_drc_selection_process.h
@@ -82,6 +82,10 @@ typedef struct ia_drc_sel_proc_params_struct {
   FLOAT32 playback_gain;
   WORD32 eq_set_purpose_request;
 
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  WORD32 loudness_leveling_on;
+#endif
+
   FLOAT32 boost;
   FLOAT32 compress;
   WORD32 drc_characteristic_target;
diff --git a/decoder/drc_src/impd_drc_selection_process_drcset_selection.c b/decoder/drc_src/impd_drc_selection_process_drcset_selection.c
index 153e2f5..9317e8c 100644
--- a/decoder/drc_src/impd_drc_selection_process_drcset_selection.c
+++ b/decoder/drc_src/impd_drc_selection_process_drcset_selection.c
@@ -30,6 +30,9 @@
 #include "impd_drc_loudness_control.h"
 #include "impd_drc_filter_bank.h"
 #include "impd_drc_rom.h"
+#ifdef LOUDNESS_LEVELING_SUPPORT
+#include "ixheaac_error_standards.h"
+#endif
 
 static const WORD32 effect_types_request_table[] = {
     EFFECT_BIT_NIGHT,    EFFECT_BIT_NOISY,   EFFECT_BIT_LIMITED,
@@ -170,6 +173,12 @@ WORD32 impd_get_ducking_drc_set(ia_drc_sel_pro_struct* pstr_drc_uni_sel_proc) {
         (EFFECT_BIT_DUCK_OTHER | EFFECT_BIT_DUCK_SELF)) {
       for (k = 0; k < str_drc_instruction_str->dwnmix_id_count; k++) {
         if (str_drc_instruction_str->downmix_id[k] == requested_dwnmix_id) {
+#ifdef LOUDNESS_LEVELING_SUPPORT
+          if (drc_instructions_index != -1) break;
+          if (pstr_drc_uni_sel_proc->uni_drc_sel_proc_params.loudness_leveling_on == 0 &&
+              str_drc_instruction_str->leveling_present == 1)
+            continue;
+#endif
           drc_instructions_index = n;
         }
       }
@@ -186,6 +195,12 @@ WORD32 impd_get_ducking_drc_set(ia_drc_sel_pro_struct* pstr_drc_uni_sel_proc) {
           (EFFECT_BIT_DUCK_OTHER | EFFECT_BIT_DUCK_SELF)) {
         for (k = 0; k < str_drc_instruction_str->dwnmix_id_count; k++) {
           if (str_drc_instruction_str->downmix_id[k] == ID_FOR_BASE_LAYOUT) {
+#ifdef LOUDNESS_LEVELING_SUPPORT
+            if (drc_instructions_index != -1) break;
+            if (pstr_drc_uni_sel_proc->uni_drc_sel_proc_params.loudness_leveling_on == 0 &&
+                str_drc_instruction_str->leveling_present == 1)
+              continue;
+#endif
             drc_instructions_index = n;
           }
         }
diff --git a/decoder/drc_src/impd_drc_selection_process_init.c b/decoder/drc_src/impd_drc_selection_process_init.c
index 4a1ae63..667a4b6 100644
--- a/decoder/drc_src/impd_drc_selection_process_init.c
+++ b/decoder/drc_src/impd_drc_selection_process_init.c
@@ -104,6 +104,10 @@ WORD32 impd_drc_sel_proc_init_dflt(
     pstr_drc_uni_sel_proc->eq_inst_index[0] = -1;
     pstr_drc_uni_sel_proc->eq_inst_index[1] = -1;
     pstr_drc_uni_sel_proc->sel_proc_request_flag = 1;
+
+#ifdef LOUDNESS_LEVELING_SUPPORT
+    pstr_drc_uni_sel_proc->uni_drc_sel_proc_params.loudness_leveling_on = 1;
+#endif
   } else {
     return 1;
   }
@@ -133,6 +137,10 @@ VOID impd_drc_sel_proc_init_interface_params(
   WORD32 i, j;
 
   if (pstr_drc_uni_sel_proc != NULL && pstr_drc_interface != NULL) {
+#ifdef LOUDNESS_LEVELING_SUPPORT
+    pstr_drc_uni_sel_proc->uni_drc_sel_proc_params.loudness_leveling_on =
+        pstr_drc_interface->drc_uni_interface_ext.loudness_leveling_on;
+#endif
     if (pstr_drc_interface->system_interface_flag) {
       if (pstr_drc_uni_sel_proc->uni_drc_sel_proc_params
               .target_config_request_type !=
diff --git a/decoder/drc_src/impd_drc_static_payload.c b/decoder/drc_src/impd_drc_static_payload.c
index 54e5162..816b9c9 100644
--- a/decoder/drc_src/impd_drc_static_payload.c
+++ b/decoder/drc_src/impd_drc_static_payload.c
@@ -954,6 +954,13 @@ impd_parse_drc_config_ext(ia_bit_buf_struct* it_bit_buff,
                                     drc_config, str_drc_config_ext);
         if (err) return (err);
         break;
+
+#ifdef LOUDNESS_LEVELING_SUPPORT
+      case UNIDRCCONFEXT_LEVELING:
+        err = impd_leveling_instructions(it_bit_buff, drc_config);
+        if (err) return err;
+        break;
+#endif
       default:
         for (i = 0; i < str_drc_config_ext->ext_bit_size[k]; i++) {
           impd_read_bits_buf(it_bit_buff, 1);
diff --git a/decoder/drc_src/impd_drc_struct.h b/decoder/drc_src/impd_drc_struct.h
index ea07644..a8e63bc 100644
--- a/decoder/drc_src/impd_drc_struct.h
+++ b/decoder/drc_src/impd_drc_struct.h
@@ -424,6 +424,9 @@ typedef struct {
   WORD32 gain_set_idx_of_ch_group_parametric_drc[CHANNEL_GROUP_COUNT_MAX];
   WORD32 parametric_drc_look_ahead_samples[CHANNEL_GROUP_COUNT_MAX];
   WORD32 parametric_drc_look_ahead_samples_max;
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  WORD32 leveling_present;
+#endif
 } ia_drc_instructions_struct;
 
 typedef struct {
diff --git a/decoder/ixheaacd_aac_config.h b/decoder/ixheaacd_aac_config.h
index b31cee3..0e6e072 100644
--- a/decoder/ixheaacd_aac_config.h
+++ b/decoder/ixheaacd_aac_config.h
@@ -65,6 +65,10 @@
 
 #define IA_XHEAAC_DEC_CONFIG_PARAM_ESBR 0x0028
 
+#ifdef LOUDNESS_LEVELING_SUPPORT
+#define IA_XHEAAC_DEC_CONFIG_PARAM_DRC_LOUDNESS_LEVELING 0x0029
+#endif
+
 #define IA_ENHAACPLUS_DEC_CONFIG_PARAM_PCM_WDSZ IA_XHEAAC_DEC_CONFIG_PARAM_PCM_WDSZ
 #define IA_ENHAACPLUS_DEC_CONFIG_PARAM_SAMP_FREQ IA_XHEAAC_DEC_CONFIG_PARAM_SAMP_FREQ
 #define IA_ENHAACPLUS_DEC_CONFIG_PARAM_NUM_CHANNELS IA_XHEAAC_DEC_CONFIG_PARAM_NUM_CHANNELS
diff --git a/decoder/ixheaacd_api.c b/decoder/ixheaacd_api.c
index 1608968..31157d2 100644
--- a/decoder/ixheaacd_api.c
+++ b/decoder/ixheaacd_api.c
@@ -480,7 +480,9 @@ IA_ERRORCODE ixheaacd_dec_api(pVOID p_ia_xheaac_dec_obj, WORD32 i_cmd,
           p_obj_exhaacplus_dec->aac_config.ui_drc_set = 0;
           p_obj_exhaacplus_dec->aac_config.ui_flush_cmd = 0;
           p_obj_exhaacplus_dec->aac_config.output_level = -1;
-
+#ifdef LOUDNESS_LEVELING_SUPPORT
+          p_obj_exhaacplus_dec->aac_config.ui_loudness_leveling_flag = 1;
+#endif
           p_obj_exhaacplus_dec->aac_config.ui_max_channels = 6;
 
           p_obj_exhaacplus_dec->aac_config.ui_coupling_channel = 0;
@@ -789,6 +791,16 @@ IA_ERRORCODE ixheaacd_dec_api(pVOID p_ia_xheaac_dec_obj, WORD32 i_cmd,
           p_obj_exhaacplus_dec->aac_config.ui_enh_sbr = *pui_value_signed;
           break;
         }
+#ifdef LOUDNESS_LEVELING_SUPPORT
+        case IA_XHEAAC_DEC_CONFIG_PARAM_DRC_LOUDNESS_LEVELING: {
+          if (((*pui_value_signed) != 0) && ((*pui_value_signed) != 1)) {
+            p_obj_exhaacplus_dec->aac_config.ui_loudness_leveling_flag = 1;
+            return (IA_XHEAAC_DEC_CONFIG_NONFATAL_INVALID_LOUDNESS_LEVELING_FLAG);
+          }
+          p_obj_exhaacplus_dec->aac_config.ui_loudness_leveling_flag = *pui_value_signed;
+          break;
+        }
+#endif
         default: { return IA_XHEAAC_DEC_API_FATAL_INVALID_CONFIG_PARAM; }
       }
       break;
@@ -931,7 +943,15 @@ IA_ERRORCODE ixheaacd_dec_api(pVOID p_ia_xheaac_dec_obj, WORD32 i_cmd,
         } else {
           *pui_value = AOT_AAC_LC;
         }
-      } else {
+      }
+#ifdef LOUDNESS_LEVELING_SUPPORT
+      else if (IA_XHEAAC_DEC_CONFIG_PARAM_DRC_LOUDNESS_LEVELING == i_idx) {
+        WORD32 *ui_value =
+            (WORD32 *)(&p_obj_exhaacplus_dec->aac_config.ui_loudness_leveling_flag);
+        *pui_value = *ui_value;
+      }
+#endif
+      else {
         return IA_XHEAAC_DEC_API_FATAL_INVALID_CONFIG_PARAM;
       }
       break;
diff --git a/decoder/ixheaacd_error_codes.h b/decoder/ixheaacd_error_codes.h
index 2e4c985..4d2a2fc 100644
--- a/decoder/ixheaacd_error_codes.h
+++ b/decoder/ixheaacd_error_codes.h
@@ -63,6 +63,9 @@
 #define IA_XHEAAC_DEC_CONFIG_NONFATAL_INVALID_ESBR_HQ_FLAG 0x00000815
 #define IA_XHEAAC_DEC_CONFIG_NONFATAL_INVALID_FRAMELENGTHFLAG 0x00000816
 #define IA_XHEAAC_DEC_CONFIG_NONFATAL_INVALID_ESBR_FLAG 0x00000817
+#ifdef LOUDNESS_LEVELING_SUPPORT
+#define IA_XHEAAC_DEC_CONFIG_NONFATAL_INVALID_LOUDNESS_LEVELING_FLAG 0x00000818
+#endif
 /* Fatal Errors */
 #define IA_XHEAAC_DEC_CONFIG_FATAL_INVALID_SAMPLE_RATE 0xFFFF8800
 
@@ -75,7 +78,7 @@
 #define IA_XHEAAC_DEC_INIT_NONFATAL_EC_INIT_FAIL 0x00001002
 #define IA_XHEAAC_DEC_INIT_NONFATAL_INSUFFICIENT_INPUT_BYTES 0x00001003
 #define IA_XHEAAC_DEC_INIT_NONFATAL_DECODE_FRAME_ERROR 0x00001004
-
+#define IA_XHEAAC_DEC_INIT_NONFATAL_MAX_INSTRUCTIONS_ERROR 0x00001005
 /* Fatal Errors */
 #define IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL 0xFFFF9000
 #define IA_XHEAAC_DEC_INIT_FATAL_EO_INPUT_REACHED 0xFFFF9001
diff --git a/decoder/ixheaacd_struct_def.h b/decoder/ixheaacd_struct_def.h
index a098594..fea3b56 100644
--- a/decoder/ixheaacd_struct_def.h
+++ b/decoder/ixheaacd_struct_def.h
@@ -137,6 +137,9 @@ typedef struct {
 
   WORD32 ui_err_conceal;
   FLAG first_frame;
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  WORD32 ui_loudness_leveling_flag;
+#endif
 } ia_aac_dec_config_struct;
 
 typedef struct ia_aac_dec_state_struct {
diff --git a/fuzzer/xaac_dec_fuzzer.cpp b/fuzzer/xaac_dec_fuzzer.cpp
index 555ba29..98fd5c4 100644
--- a/fuzzer/xaac_dec_fuzzer.cpp
+++ b/fuzzer/xaac_dec_fuzzer.cpp
@@ -240,6 +240,10 @@ enum {
   DRC_BOOST_OFFSET,
   DRC_COMPRESS_OFFSET,
   DRC_EFFECT_OFFSET
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  ,
+  DRC_LOUDNESS_LEVELING_OFFSET
+#endif
 };
 
 IA_ERRORCODE Codec::initXAACDrc(const uint8_t* data, size_t size) {
@@ -295,6 +299,15 @@ IA_ERRORCODE Codec::initXAACDrc(const uint8_t* data, size_t size) {
   err_code = ixheaacd_dec_api(mXheaacCodecHandle, IA_API_CMD_SET_CONFIG_PARAM,
                               IA_ENHAACPLUS_DEC_DRC_EFFECT_TYPE, &ui_drc_val);
 
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  // DRC_LOUDNESS_LEVELING_FLAG
+  size_t flagOffset = std::min((size_t)DRC_LOUDNESS_LEVELING_OFFSET, size - 1);
+  uint8_t loudnessFlag = data[flagOffset];
+  ui_drc_val = (unsigned int)loudnessFlag;
+  err_code = ixheaacd_dec_api(mXheaacCodecHandle, IA_API_CMD_SET_CONFIG_PARAM,
+                              IA_XHEAAC_DEC_CONFIG_PARAM_DRC_LOUDNESS_LEVELING, &ui_drc_val);
+#endif
+
   return IA_NO_ERROR;
 }
 
diff --git a/test/decoder/impd_drc_config_params.h b/test/decoder/impd_drc_config_params.h
index 36ca1fe..47f7873 100644
--- a/test/decoder/impd_drc_config_params.h
+++ b/test/decoder/impd_drc_config_params.h
@@ -44,7 +44,9 @@
 
 #define IA_DRC_DEC_CONFIG_PARAM_APPLY_CROSSFADE 0x0017
 #define IA_DRC_DEC_CONFIG_PARAM_CONFIG_CHANGED 0x0018
-
+#ifdef LOUDNESS_LEVELING_SUPPORT
+#define IA_DRC_DEC_CONFIG_DRC_LOUDNESS_LEVELING 0x0019
+#endif
 #define IA_API_CMD_SET_INPUT_BYTES_BS 0x0026
 #define IA_API_CMD_SET_INPUT_BYTES_IC_BS 0x0027
 #define IA_API_CMD_SET_INPUT_BYTES_IL_BS 0x0029
diff --git a/test/decoder/ixheaacd_error.c b/test/decoder/ixheaacd_error.c
index 78b96ef..82d4b5a 100644
--- a/test/decoder/ixheaacd_error.c
+++ b/test/decoder/ixheaacd_error.c
@@ -75,7 +75,12 @@ pWORD8 ixheaacd_ppb_config_non_fatal[IA_MAX_ERROR_SUB_CODE] = {
     (pWORD8) "Invalid target loudness value",
     (pWORD8) "Invalid HQ eSBR flag option. Setting to default 0",
     (pWORD8) "Invalid frame length flag option. Setting to default 0",
-    (pWORD8) "Invalid eSBR flag option. Setting to default 1"};
+    (pWORD8) "Invalid eSBR flag option. Setting to default 1"
+#ifdef LOUDNESS_LEVELING_SUPPORT
+    ,
+    (pWORD8) "Invalid Loudness leveling flag option. Setting to default 1"
+#endif
+};
 /* Fatal Errors */
 pWORD8 ixheaacd_ppb_config_fatal[IA_MAX_ERROR_SUB_CODE] = {
     (pWORD8) "Invalid Sample rate specified for RAW decoding"};
@@ -87,7 +92,12 @@ pWORD8 ixheaacd_ppb_config_fatal[IA_MAX_ERROR_SUB_CODE] = {
 pWORD8 ixheaacd_ppb_init_non_fatal[IA_MAX_ERROR_SUB_CODE] = {
     (pWORD8) "Header not found at the beginning of input data continuing syncing",
     (pWORD8) "Invalid number of QMF bands", (pWORD8) "Decoder initialization failed",
-    (pWORD8) "Input bytes insufficient for decoding", (pWORD8) "Error in AAC decoding"};
+    (pWORD8) "Input bytes insufficient for decoding", (pWORD8) "Error in AAC decoding"
+#ifdef LOUDNESS_LEVELING_SUPPORT
+    ,
+    (pWORD8) "DRC instruction count exceeded"
+#endif
+};
 /* Fatal Errors */
 pWORD8 ixheaacd_ppb_init_fatal[IA_MAX_ERROR_SUB_CODE] = {
     (pWORD8) "AAC Decoder initialization failed",
diff --git a/test/decoder/ixheaacd_main.c b/test/decoder/ixheaacd_main.c
index a96cf0e..9d0429d 100644
--- a/test/decoder/ixheaacd_main.c
+++ b/test/decoder/ixheaacd_main.c
@@ -689,6 +689,17 @@ IA_ERRORCODE ixheaacd_set_config_param(WORD32 argc, pWORD8 argv[],
       _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
       ec_enable = ui_err_conceal;
     }
+#ifdef LOUDNESS_LEVELING_SUPPORT
+    /* For loudness leveling*/
+    if (!strncmp((pCHAR8)argv[i], "-loudness_leveling:", 19)) {
+      pCHAR8 pb_arg_val = (pCHAR8)(argv[i] + 19);
+      UWORD32 loudness_leveling_flag = atoi(pb_arg_val);
+      err_code = (*p_ia_process_api)(p_ia_process_api_obj, IA_API_CMD_SET_CONFIG_PARAM,
+                                     IA_XHEAAC_DEC_CONFIG_PARAM_DRC_LOUDNESS_LEVELING,
+                                     &loudness_leveling_flag);
+      _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+    }
+#endif
   }
 #ifdef SUPPORT_MP4
   {
@@ -935,7 +946,9 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
   WORD32 drc_flag = 0;
   WORD32 mpegd_drc_present = 0;
   WORD32 uo_num_chan;
-
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  WORD32 i_loudness_leveling_flag = 1;
+#endif
   /* The process API function */
   IA_ERRORCODE(*p_ia_process_api)
   (pVOID p_ia_process_api_obj, WORD32 i_cmd, WORD32 i_idx, pVOID pv_value);
@@ -1597,6 +1610,22 @@ int ixheaacd_main_process(WORD32 argc, pWORD8 argv[]) {
       _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
     }
 
+#ifdef LOUDNESS_LEVELING_SUPPORT
+    /*Set loudness leveling */
+
+    {
+      err_code = (*p_ia_process_api)(pv_ia_process_api_obj, IA_API_CMD_GET_CONFIG_PARAM,
+                                     IA_XHEAAC_DEC_CONFIG_PARAM_DRC_LOUDNESS_LEVELING,
+                                     &i_loudness_leveling_flag);
+      _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+
+      err_code =
+          ia_drc_dec_api(pv_ia_drc_process_api_obj, IA_API_CMD_SET_CONFIG_PARAM,
+                         IA_DRC_DEC_CONFIG_DRC_LOUDNESS_LEVELING, &i_loudness_leveling_flag);
+      _IA_HANDLE_ERROR(p_proc_err_info, (pWORD8) "", err_code);
+    }
+#endif
+
     /*Set loud_norm_flag*/
     {
       err_code = (*p_ia_process_api)(
@@ -2582,6 +2611,9 @@ void print_usage() {
   printf("\n[-peak_limiter_off:<peak_limiter_off_flag>]");
   printf("\n[-err_conceal:<error_concealment_flag>]");
   printf("\n[-esbr:<esbr_flag>]");
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  printf("\n[-loudness_leveling:<loudness_leveling_flag>]");
+#endif
   printf("\n\nwhere, \n  <input_file> is the input AAC-LC/HE-AACv1/HE-AACv2//AAC-LD/AAC-ELD/AAC-ELDv2/USAC file name");
   printf("\n  <meta_data_file> is a text file which contains metadata.");
   printf("\n   To be given when -mp4:1 is enabled");
@@ -2638,6 +2670,10 @@ void print_usage() {
   printf("\n  <error_concealment_flag> is to enable / disable error concealment.");
   printf("\n    Default value is 0");
   printf("\n  <esbr_flag> is to enable / disable eSBR. Default value is 1\n\n");
+#ifdef LOUDNESS_LEVELING_SUPPORT
+  printf("\n  <loudness_leveling_flag>] is to enable / disable loudness leveling.");
+  printf("\n    Default value is 1");
+#endif
 }
 
 /*******************************************************************************/
diff --git a/test/decoder/xaacdec.cmake b/test/decoder/xaacdec.cmake
index 26307bf..f499ea8 100644
--- a/test/decoder/xaacdec.cmake
+++ b/test/decoder/xaacdec.cmake
@@ -46,7 +46,7 @@ if(SUPPORT_MP4)
 endif()
 
 # Common compile flags
-set(COMMON_FLAGS "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32")
+set(COMMON_FLAGS "-UARM_PROFILE_HW -UARM_PROFILE_BOARD -DDRC_ENABLE -DMULTICHANNEL_ENABLE -DECLIPSE -DWIN32 -DLOUDNESS_LEVELING_SUPPORT")
 
 if(SUPPORT_MP4)
   set(MP4_FLAG "-DSUPPORT_MP4")