PR #25764 opened by Romain Beauxis (toots)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25764
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25764.patch

This PR gives correct timestamps to ADTS streams spliced from streams with 
different frame durations, such as an Icecast listener moved from an LC mount 
to an HE-AAC one.

The AAC parser sets the duration of a frame that does not match the probed 
stream from its ADTS header. The ADTS sample rate and sample count can be those 
of the HE-AAC core, but their ratio is still the frame duration, so the parser 
expresses it in units of the probed `avctx->sample_rate` and carries the 
remainder to the next frame:

```c
num      = (int64_t)hdr->samples * avctx->sample_rate;
mismatch = num != (int64_t)avctx->frame_size * hdr->sample_rate;
```

Frames that match the probed stream are left to the demuxer as before, so 
streams without a splice are unchanged. ADTS streams that change their sampling 
rate mid-stream are not technically valid, since ISO/IEC 13818-7 puts 
`sampling_frequency_index` in the fixed header, whose information "does not 
change from frame to frame", so this is a workaround that makes the parser more 
robust to them, and it logs a warning at each splice:

```
[aac] ADTS frame duration changed mid-stream to 1024 samples at 22050 Hz
```

A new FATE test, `fate-aac-adts-splice`, splices LC, HE and LC samples from the 
suite; it is added in its own commit first, and the fix commit updates its 
reference.

Fixes #25756.


>From 3742d2a28e0cf6e8dfd0878518cdc3136a7f04bb Mon Sep 17 00:00:00 2001
From: Romain Beauxis <[email protected]>
Date: Wed, 4 Nov 2026 15:14:22 -0600
Subject: [PATCH 1/2] tests/fate/aac: add a test for spliced ADTS streams

The test concatenates LC, HE and LC ADTS streams and records the packet 
timestamps.
---
 tests/fate/aac.mak             |   3 +
 tests/ref/fate/aac-adts-splice | 229 +++++++++++++++++++++++++++++++++
 2 files changed, 232 insertions(+)
 create mode 100644 tests/ref/fate/aac-adts-splice

diff --git a/tests/fate/aac.mak b/tests/fate/aac.mak
index 7bc9780fed3..489d987d254 100644
--- a/tests/fate/aac.mak
+++ b/tests/fate/aac.mak
@@ -327,6 +327,9 @@ FATE_AAC_ENCODE_FFPROBE-$(call TRANSCODE, AAC, ADTS AAC, 
WAV_DEMUXER PCM_S16LE_D
 
 FATE_AAC_BSF-$(call FRAMECRC, AAC MATROSKA, AAC, AAC_PARSER AAC_ADTSTOASC_BSF 
MATROSKA_MUXER) += fate-aac-autobsf-adtstoasc
 
+FATE_AAC_BSF-$(call FRAMECRC, AAC, AAC, AAC_PARSER CONCAT_PROTOCOL) += 
fate-aac-adts-splice
+fate-aac-adts-splice: CMD = framecrc "-i 
concat:$(TARGET_SAMPLES)/audiomatch/tones_afconvert_44100_stereo_aac_lc.adts|$(TARGET_SAMPLES)/audiomatch/tones_afconvert_44100_stereo_aac_he.adts|$(TARGET_SAMPLES)/audiomatch/tones_afconvert_44100_stereo_aac_lc.adts
 -c:a copy"
+
 # The pre-roll a seek needs, by how long a frame is in output samples.
 FATE_AAC_PREROLL-$(call DEMDEC, MOV, AAC) += fate-aac-seek-preroll-sbr \
                                             
fate-aac-seek-preroll-sbr-no-doubling \
diff --git a/tests/ref/fate/aac-adts-splice b/tests/ref/fate/aac-adts-splice
new file mode 100644
index 00000000000..6bc6752fdaa
--- /dev/null
+++ b/tests/ref/fate/aac-adts-splice
@@ -0,0 +1,229 @@
+#tb 0: 1/28224000
+#media_type 0: audio
+#codec_id 0: aac
+#sample_rate 0: 44100
+#channel_layout_name 0: stereo
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-- 
2.54.0


>From 21a17aac95b0bc5f5943c55fed92358b9521c85e Mon Sep 17 00:00:00 2001
From: Romain Beauxis <[email protected]>
Date: Wed, 4 Nov 2026 15:14:22 -0600
Subject: [PATCH 2/2] avcodec/aac_ac3_parser: derive the duration of spliced
 ADTS frames

The parser sets the duration of an ADTS frame that does not match the probed 
stream from the sample count and sample rate in its header.

It warns when this happens, since the stream changed its frame duration 
mid-stream.

The splice test reference now gives each section its own frame duration.
---
 libavcodec/aac_ac3_parser.c    |  40 +++++
 libavcodec/aac_ac3_parser.h    |   5 +
 tests/ref/fate/aac-adts-splice | 270 ++++++++++++++++-----------------
 3 files changed, 180 insertions(+), 135 deletions(-)

diff --git a/libavcodec/aac_ac3_parser.c b/libavcodec/aac_ac3_parser.c
index 51c801214c0..6961d76f99f 100644
--- a/libavcodec/aac_ac3_parser.c
+++ b/libavcodec/aac_ac3_parser.c
@@ -29,6 +29,45 @@
 #include "ac3_parser_internal.h"
 #include "adts_header.h"
 
+#if CONFIG_AAC_PARSER
+/**
+ * Set the duration of an ADTS frame that does not match the probed stream,
+ * as when two streams are spliced together.
+ *
+ * The ratio of the ADTS sample count to the ADTS sample rate is the frame
+ * duration even for HE-AAC, so it is expressed in units of
+ * avctx->sample_rate and the remainder carried to the next frame.
+ */
+static void set_spliced_adts_duration(AVCodecParserContext *s1,
+                                      AVCodecContext *avctx,
+                                      const AACADTSHeaderInfo *hdr)
+{
+    AACAC3ParseContext *s = s1->priv_data;
+    int64_t num;
+    int mismatch;
+
+    if (avctx->frame_size <= 0 || avctx->sample_rate <= 0)
+        return;
+
+    num      = (int64_t)hdr->samples * avctx->sample_rate;
+    mismatch = num != (int64_t)avctx->frame_size * hdr->sample_rate;
+
+    if (!mismatch) {
+        s1->duration    = 0;
+        s->duration_rem = 0;
+    } else {
+        if (!s->spliced)
+            av_log(avctx, AV_LOG_WARNING,
+                   "ADTS frame duration changed mid-stream to "
+                   "%d samples at %d Hz\n", hdr->samples, hdr->sample_rate);
+        num            += s->duration_rem;
+        s1->duration    = num / hdr->sample_rate;
+        s->duration_rem = num % hdr->sample_rate;
+    }
+    s->spliced = mismatch;
+}
+#endif
+
 int ff_aac_ac3_parse(AVCodecParserContext *s1,
                      AVCodecContext *avctx,
                      const uint8_t **poutbuf, int *poutbuf_size,
@@ -156,6 +195,7 @@ get_next:
                 avctx->profile = hdr.object_type - 1;
             /* ADTS does not support USAC */
             s1->key_frame = 1;
+            set_spliced_adts_duration(s1, avctx, &hdr);
             bit_rate = hdr.bit_rate;
 #endif
         }
diff --git a/libavcodec/aac_ac3_parser.h b/libavcodec/aac_ac3_parser.h
index e3259d1841e..a229b73d171 100644
--- a/libavcodec/aac_ac3_parser.h
+++ b/libavcodec/aac_ac3_parser.h
@@ -39,6 +39,11 @@ typedef struct AACAC3ParseContext {
 
     int need_next_header;
     int frame_number;
+    /// remainder of the last spliced ADTS frame duration, in units of
+    /// 1 / (its ADTS sample rate) of an avctx->sample_rate sample
+    int64_t duration_rem;
+    /// whether the last ADTS frame did not match the probed stream
+    int spliced;
 } AACAC3ParseContext;
 
 int ff_aac_ac3_parse(AVCodecParserContext *s1,
diff --git a/tests/ref/fate/aac-adts-splice b/tests/ref/fate/aac-adts-splice
index 6bc6752fdaa..f566b92ec7b 100644
--- a/tests/ref/fate/aac-adts-splice
+++ b/tests/ref/fate/aac-adts-splice
@@ -92,138 +92,138 @@
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-- 
2.54.0

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