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new 7bced195da avformat/wavdec: cache avio_size() before footer seeks
7bced195da is described below
commit 7bced195dabc09959de95eaa0cd22b2b3df8a7b4
Author: Andreas Menze <[email protected]>
AuthorDate: Thu Aug 13 09:11:27 2026 +0200
Commit: michaelni <[email protected]>
CommitDate: Sun Aug 30 14:27:03 2026 +0000
avformat/wavdec: cache avio_size() before footer seeks
Over HTTP, seeking to a trailing chunk can make avio_size() stale, so the
PCM
duration guard fails and duration is N/A. Cache size before seeking.
Fixes #24122
---
libavformat/wavdec.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index 8501d94deb..8d19e52ead 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -370,11 +370,13 @@ static int wav_read_header(AVFormatContext *s)
WAVDemuxContext *wav = s->priv_data;
int ret, got_fmt = 0, got_xma2 = 0;
int64_t next_tag_ofs, data_ofs = -1;
+ int64_t filesize;
wav->unaligned = avio_tell(s->pb) & 1;
wav->smv_data_ofs = -1;
+ filesize = avio_size(pb);
/* read chunk ID */
tag = avio_rl32(pb);
switch (tag) {
@@ -661,7 +663,7 @@ break_loop:
if ( st->codecpar->ch_layout.nb_channels
&& data_size
&& av_get_bits_per_sample(st->codecpar->codec_id)
- && wav->data_end <= avio_size(pb))
+ && wav->data_end <= filesize)
sample_count = (data_size << 3)
/
(st->codecpar->ch_layout.nb_channels *
(uint64_t)av_get_bits_per_sample(st->codecpar->codec_id));
--
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