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author | wm4 <wm4@nowhere> | 2019-11-14 12:59:14 +0100 |
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committer | wm4 <wm4@nowhere> | 2019-11-14 12:59:14 +0100 |
commit | ac7f67b3f23a63e463fb881d960bc8f31a230292 (patch) | |
tree | 5d40b4c6a9df371dde1317b2a758b50f7df68439 /demux/ebml.c | |
parent | dcc3c2eb3877f9876cc218b1e5f1187b81036c49 (diff) | |
download | mpv-ac7f67b3f23a63e463fb881d960bc8f31a230292.tar.bz2 mpv-ac7f67b3f23a63e463fb881d960bc8f31a230292.tar.xz |
demux_mkv, stream: attempt to improve behavior in unseekable streams
stream_skip() semantics were kind of bad, especially after the recent
change to the stream code. Forward stream_skip() calls could still
trigger a seek and fail, even if it was supposed to actually skip data.
(Maybe the idea that stream_skip() should try to seek is worthless in
the first place.)
Rename it to stream_seek_skip() (takes absolute position now because I
think that's better), and make it always skip if the stream is marked as
forward.
While we're at it, make EOF detection more robust. I guess s->eof
shouldn't exist at all, since it's valid only "sometimes". It should be
removed... but not today. A 1-byte stream_read_peek() call is good to
get the s->eof flag set to a correct value.
Diffstat (limited to 'demux/ebml.c')
-rw-r--r-- | demux/ebml.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/demux/ebml.c b/demux/ebml.c index 44fa0c0793..143a5fe57b 100644 --- a/demux/ebml.c +++ b/demux/ebml.c @@ -180,14 +180,14 @@ int ebml_read_skip(struct mp_log *log, int64_t end, stream_t *s) if (len >= INT64_MAX - pos2 || (end > 0 && pos2 + len > end)) goto invalid; - if (!stream_skip(s, len)) + if (!stream_seek_skip(s, pos2 + len)) goto invalid; return 0; invalid: mp_err(log, "Invalid EBML length at position %"PRId64"\n", pos); - stream_seek(s, pos); + stream_seek_skip(s, pos); return 1; } @@ -198,6 +198,7 @@ int ebml_resync_cluster(struct mp_log *log, stream_t *s) { int64_t pos = stream_tell(s); uint32_t last_4_bytes = 0; + stream_read_peek(s, &(char){0}, 1); if (!s->eof) { mp_err(log, "Corrupt file detected. " "Trying to resync starting from position %"PRId64"...\n", pos); |