From 0488a2b6c86541f8864caa0a60f0a8abb54ecfaa Mon Sep 17 00:00:00 2001
From: "Malenovsky, Vladimir" <vmale@dolby.com>
Date: Wed, 7 Jan 2026 13:21:54 +0100
Subject: [PATCH 1/3] - add warning message when renderer frame size is
 modififed in ISAR - simplify logic around ivas_limiter_dec()

---
 apps/decoder.c    |  8 ++++++++
 lib_com/options.h |  1 +
 lib_dec/lib_dec.c | 10 ++++++++++
 3 files changed, 19 insertions(+)

diff --git a/apps/decoder.c b/apps/decoder.c
index f6b55ba00f..59bc2bd9d1 100644
--- a/apps/decoder.c
+++ b/apps/decoder.c
@@ -487,6 +487,14 @@ int main(
             fprintf( stderr, "\nConfigure failed: %s\n\n", IVAS_DEC_GetErrorMessage( error ) );
             goto cleanup;
         }
+
+#ifdef FIX_1449_RENDERER_FRAME_SIZE_UNCLEAR_IN_ISAR
+        if ( !arg.renderConfigEnabled && ( arg.renderFramesize != asked_frame_size ) )
+        {
+            fprintf( stderr, "\nChanged render framesize, only 20ms are allowed for non-0dof split rendering!\n" );
+        }
+#endif
+
     }
 
     /*------------------------------------------------------------------------------------------*
diff --git a/lib_com/options.h b/lib_com/options.h
index de58cbabd7..fdc8f3ad6a 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -173,6 +173,7 @@
 #define FIX_2287_MCT_MDCT_STEREO_DATA_MALLOC_SIZE       /* FhG: correct allocation size for STEREO_MDCT_DEC_DATA struct */
 #define FIX_2271_OOB_INDEXING_IN_PIT_OL2                /* VA: Fix for issue 2271, to silence clang18 */
 #define FIX_2273_OOB_INDEXING_IN_PIT_FR4                /* VA: Fix to silence clang on ptr init */
+#define FIX_1449_RENDERER_FRAME_SIZE_UNCLEAR_IN_ISAR    /* Dolby: Fix for issue 1449: renderer frame size unclear in ISAR */
 
 /* #################### End BE switches ################################## */
 
diff --git a/lib_dec/lib_dec.c b/lib_dec/lib_dec.c
index 17342a454a..99e672f6e6 100644
--- a/lib_dec/lib_dec.c
+++ b/lib_dec/lib_dec.c
@@ -2183,6 +2183,11 @@ ivas_error IVAS_DEC_GetSplitBinauralBitstream(
     /* convert to int16 with limiting for BINAURAL_SPLIT_PCM */
     if ( pcm_out_flag )
     {
+#ifdef FIX_1449_RENDERER_FRAME_SIZE_UNCLEAR_IN_ISAR
+#ifndef DISABLE_LIMITER
+        ivas_limiter_dec( st_ivas->hLimiter, p_head_pose_buf, st_ivas->hDecoderConfig->nchan_out, numSamplesPerChannelToOutput, st_ivas->BER_detect );
+#endif
+#else
         if ( st_ivas->hDecoderConfig->render_framesize == IVAS_RENDER_FRAMESIZE_5MS )
         {
 #ifndef DISABLE_LIMITER
@@ -2193,6 +2198,7 @@ ivas_error IVAS_DEC_GetSplitBinauralBitstream(
         {
             ivas_limiter_dec( st_ivas->hLimiter, p_head_pose_buf, st_ivas->hDecoderConfig->nchan_out, numSamplesPerChannelToOutput, st_ivas->BER_detect );
         }
+#endif
 
 #ifdef DEBUGGING
         st_ivas->noClipping +=
@@ -4118,6 +4124,9 @@ static ivas_error ivas_dec_voip_get_samples_common(
         /* Synthesise PCM output if split PCM */
         if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_PCM )
         {
+#ifdef FIX_1449_RENDERER_FRAME_SIZE_UNCLEAR_IN_ISAR
+            ivas_limiter_dec( st_ivas->hLimiter, p_head_pose_buf, st_ivas->hDecoderConfig->nchan_out, *nSamplesRendered, st_ivas->BER_detect );
+#else
             if ( st_ivas->hDecoderConfig->render_framesize == IVAS_RENDER_FRAMESIZE_5MS )
             {
 #ifndef DISABLE_LIMITER
@@ -4128,6 +4137,7 @@ static ivas_error ivas_dec_voip_get_samples_common(
             {
                 ivas_limiter_dec( st_ivas->hLimiter, p_head_pose_buf, st_ivas->hDecoderConfig->nchan_out, *nSamplesRendered, st_ivas->BER_detect );
             }
+#endif
 
 #ifdef DEBUGGING
             st_ivas->noClipping +=
-- 
GitLab


From f69e581acdbca98ded500f0fe5061af47d2f39e3 Mon Sep 17 00:00:00 2001
From: "Malenovsky, Vladimir" <vmale@dolby.com>
Date: Wed, 7 Jan 2026 13:28:34 +0100
Subject: [PATCH 2/3] add #ifdef DISABLE_LIMITER

---
 lib_dec/lib_dec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib_dec/lib_dec.c b/lib_dec/lib_dec.c
index 99e672f6e6..64e025d47f 100644
--- a/lib_dec/lib_dec.c
+++ b/lib_dec/lib_dec.c
@@ -4125,7 +4125,9 @@ static ivas_error ivas_dec_voip_get_samples_common(
         if ( st_ivas->hDecoderConfig->output_config == IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_PCM )
         {
 #ifdef FIX_1449_RENDERER_FRAME_SIZE_UNCLEAR_IN_ISAR
+#ifndef DISABLE_LIMITER
             ivas_limiter_dec( st_ivas->hLimiter, p_head_pose_buf, st_ivas->hDecoderConfig->nchan_out, *nSamplesRendered, st_ivas->BER_detect );
+#endif
 #else
             if ( st_ivas->hDecoderConfig->render_framesize == IVAS_RENDER_FRAMESIZE_5MS )
             {
-- 
GitLab


From 47eab9034fafe2266fdd996e4bc3e66ab013525e Mon Sep 17 00:00:00 2001
From: Vladimir Malenovsky <vladimir.malenovsky@dolby.com>
Date: Wed, 7 Jan 2026 13:31:35 +0100
Subject: [PATCH 3/3] clang format

---
 apps/decoder.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/apps/decoder.c b/apps/decoder.c
index 59bc2bd9d1..36c454de43 100644
--- a/apps/decoder.c
+++ b/apps/decoder.c
@@ -494,7 +494,6 @@ int main(
             fprintf( stderr, "\nChanged render framesize, only 20ms are allowed for non-0dof split rendering!\n" );
         }
 #endif
-
     }
 
     /*------------------------------------------------------------------------------------------*
-- 
GitLab