[FFmpeg-cvslog] avcodec/utils: don't return negative values in av_get_audio_frame_duration()

[James Almer]

ffmpeg | branch: release/4.4 | James Almer <jamrial at gmail.com> | Wed Jul 21 01:02:44 2021 -0300| [07dec5b0c383ebd6053bdf0a022dfe4aa01b9b70] | committer: Michael Niedermayer

avcodec/utils: don't return negative values in av_get_audio_frame_duration()

In some extrme cases, like with adpcm_ms samples with an extremely high channel
count, get_audio_frame_duration() may return a negative frame duration value.
Don't propagate it, and instead return 0, signaling that a duration could not
be determined.

Fixes ticket #9312

Signed-off-by: James Almer <jamrial at gmail.com>
(cherry picked from commit e01d306c647b5827102260b885faa223b646d2d1)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=07dec5b0c383ebd6053bdf0a022dfe4aa01b9b70
---

 libavcodec/utils.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index af121ff910..434004cccf 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -847,20 +847,22 @@ static int get_audio_frame_duration(enum AVCodecID id, int sr, int ch, int ba,
 
 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
 {
-    return get_audio_frame_duration(avctx->codec_id, avctx->sample_rate,
+    int duration = get_audio_frame_duration(avctx->codec_id, avctx->sample_rate,
                                     avctx->channels, avctx->block_align,
                                     avctx->codec_tag, avctx->bits_per_coded_sample,
                                     avctx->bit_rate, avctx->extradata, avctx->frame_size,
                                     frame_bytes);
+    return FFMAX(0, duration);
 }
 
 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
 {
-    return get_audio_frame_duration(par->codec_id, par->sample_rate,
+    int duration = get_audio_frame_duration(par->codec_id, par->sample_rate,
                                     par->channels, par->block_align,
                                     par->codec_tag, par->bits_per_coded_sample,
                                     par->bit_rate, par->extradata, par->frame_size,
                                     frame_bytes);
+    return FFMAX(0, duration);
 }
 
 #if !HAVE_THREADS