[FFmpeg-devel] [mov] Fix trampling of ctts during seeks when sidx support is enabled.
Michael Niedermayer
michael at niedermayer.cc
Wed Aug 9 04:48:05 EEST 2017
On Mon, Aug 07, 2017 at 12:31:01PM -0700, Dale Curtis wrote:
> On Fri, Aug 4, 2017 at 4:40 PM, Rodger Combs <rodger.combs at gmail.com> wrote:
>
> > + sc->ctts_data = av_fast_realloc(sc->ctts_data,
> > &sc->ctts_allocated_size, request_size);
> > ^ this line is incorrect; setting realloc's first arg to its return value
> > leaks the existing allocation in the OOM case. Since you're doing your own
> > calculation for the desired new size here, you may want to use av_reallocp
> > (which frees the original allocation on failure).
> >
>
> Thanks, fixed; kept av_fast_realloc() for size setting simplicity, but
> reused function-scope ctts_data as temporary.
>
>
> >
> > When reading a trun that requires this sort of realloc, is it common for
> > there to be any existing entries in the range we're writing? Would it be
> > safe to remove+replace them? Could we do a single realloc + single memmove,
> > and then fill the newly-opened space, rather than repeating the memmove for
> > each entry?
> >
>
> Yes it's common for their to be existing entries. To be clear this occurs
> with standard files that are of sufficient length that a seek can occur
> before all trun boxes are read. We could speculatively move all entries
> based on the first insert and total entries count, but their are several
> conditionals in av_add_index_entry() which may cause a bail out and such
> failure would be unrecoverable (maybe painfully?) if we moved everything
> ahead of time.
>
> - dale
> libavformat/isom.h | 1
> libavformat/mov.c | 79 +++++++++++++++++----------
> tests/fate/seek.mak | 3 +
> tests/ref/seek/extra-mp4 | 134 +++++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 189 insertions(+), 28 deletions(-)
> a2c3a9c29cc60b76508cc7fd9168bdffd60c6ead ctts_fix_v7.patch
> From 4938dac2d9f3b40c62822d9129046edbde44468d Mon Sep 17 00:00:00 2001
> From: Dale Curtis <dalecurtis at chromium.org>
> Date: Mon, 17 Jul 2017 17:38:09 -0700
> Subject: [PATCH] Fix trampling of ctts during seeks when sidx support is
> enabled.
>
> When sidx box support is enabled, the code will skip reading all
> trun boxes (each containing ctts entries for samples inthat box).
>
> If seeks are attempted before all ctts values are known, the old
> code would dump ctts entries into the wrong location. These are
> then used to compute pts values which leads to out of order and
> incorrectly timestamped packets.
>
> This patch fixes ctts processing by always using the index returned
> by av_add_index_entry() as the ctts_data index. When the index gains
> new entries old values are reshuffled as appropriate.
>
> This approach makes sense since the mov demuxer is already relying
> on the mapping of AVIndex entries to samples for correct demuxing.
>
> As a result of this all ctts entries are now 1-count. A followup
> change will be submitted to remove support for > 1 count entries
> which will simplify seeking.
>
> Notes for future improvement:
> Probably there are other boxes (stts, stsc, etc) that are impacted
> by this issue... this patch only attempts to fix ctts since it
> completely breaks packet timestamping.
>
> This patch continues using an array for the ctts data, which is not
> the most ideal given the rearrangement that needs to happen (via
> memmove as new entries are read in). Ideally AVIndex and the ctts
> data would be set-type structures so addition is always worst case
> O(lg(n)) instead of the O(n^2) that exists now; this slowdown is
> noticeable during seeks.
>
> Signed-off-by: Dale Curtis <dalecurtis at chromium.org>
> ---
> libavformat/isom.h | 1 +
> libavformat/mov.c | 79 ++++++++++++++++++----------
> tests/fate/seek.mak | 3 ++
> tests/ref/seek/extra-mp4 | 134 +++++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 189 insertions(+), 28 deletions(-)
> create mode 100644 tests/ref/seek/extra-mp4
the fate test seems to fail:
did i do something silly ?
TEST seek-extra-mp4
--- ./tests/ref/seek/extra-mp4 2017-08-09 03:46:04.041659416 +0200
+++ tests/data/fate/seek-extra-mp4 2017-08-09 03:46:18.565659589 +0200
@@ -1,134 +1,134 @@
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+ret: 0 st: 0 flags:0 dts: 0.066667 pts: 0.100000 pos: 6998 size: 11041
ret: 0 st: 0 flags:0 ts: 102.671678
-ret: 0 st: 0 flags:1 dts: 104.100000 pts: 104.133333 pos:11107176 size:112893
-ret: 0 st: 0 flags:0 dts: 104.133333 pts: 104.166667 pos:11220069 size: 585
-ret: 0 st: 0 flags:0 dts: 104.166667 pts: 104.200000 pos:11220654 size: 797
-ret: 0 st: 0 flags:0 dts: 104.200000 pts: 104.233333 pos:11221451 size: 810
+ret: 0 st: 0 flags:1 dts: 104.100000 pts: 104.133333 pos:11064650 size:112893
+ret: 0 st: 0 flags:0 dts: 104.133333 pts: 104.166667 pos:11177543 size: 585
+ret: 0 st: 0 flags:0 dts: 104.166667 pts: 104.200000 pos:11178128 size: 797
+ret: 0 st: 0 flags:0 dts: 104.200000 pts: 104.233333 pos:11178925 size: 810
ret: 0 st: 0 flags:1 ts: 25.565844
-ret: 0 st: 0 flags:1 dts: 25.300000 pts: 25.333333 pos:2607665 size: 40237
-ret: 0 st: 0 flags:0 dts: 25.333333 pts: 25.433333 pos:2647902 size: 2959
-ret: 0 st: 0 flags:0 dts: 25.366667 pts: 25.366667 pos:2650861 size: 197
-ret: 0 st: 0 flags:0 dts: 25.400000 pts: 25.400000 pos:2651058 size: 230
+ret: 0 st: 0 flags:1 dts: 25.300000 pts: 25.333333 pos:2593939 size: 40237
+ret: 0 st: 0 flags:0 dts: 25.333333 pts: 25.433333 pos:2634176 size: 2959
+ret: 0 st: 0 flags:0 dts: 25.366667 pts: 25.366667 pos:2637135 size: 197
+ret: 0 st: 0 flags:0 dts: 25.400000 pts: 25.400000 pos:2637332 size: 230
ret: 0 st:-1 flags:0 ts: 128.460008
-ret: 0 st: 0 flags:1 dts: 131.233333 pts: 131.266667 pos:13715044 size: 62193
-ret: 0 st: 0 flags:0 dts: 131.266667 pts: 131.366667 pos:13777237 size: 2349
-ret: 0 st: 0 flags:0 dts: 131.300000 pts: 131.300000 pos:13779586 size: 571
-ret: 0 st: 0 flags:0 dts: 131.333333 pts: 131.333333 pos:13780157 size: 1190
+ret: 0 st: 0 flags:1 dts: 131.233333 pts: 131.266667 pos:13662918 size: 62193
+ret: 0 st: 0 flags:0 dts: 131.266667 pts: 131.366667 pos:13725111 size: 2349
+ret: 0 st: 0 flags:0 dts: 131.300000 pts: 131.300000 pos:13727460 size: 571
+ret: 0 st: 0 flags:0 dts: 131.333333 pts: 131.333333 pos:13728031 size: 1190
ret: 0 st:-1 flags:1 ts: 51.354175
-ret: 0 st: 0 flags:1 dts: 50.633333 pts: 50.666667 pos:5856029 size: 67867
-ret: 0 st: 0 flags:0 dts: 50.666667 pts: 50.766667 pos:5923896 size: 1307
-ret: 0 st: 0 flags:0 dts: 50.700000 pts: 50.700000 pos:5925203 size: 150
-ret: 0 st: 0 flags:0 dts: 50.733333 pts: 50.733333 pos:5925353 size: 176
+ret: 0 st: 0 flags:1 dts: 50.633333 pts: 50.666667 pos:5832703 size: 67867
+ret: 0 st: 0 flags:0 dts: 50.666667 pts: 50.766667 pos:5900570 size: 1307
+ret: 0 st: 0 flags:0 dts: 50.700000 pts: 50.700000 pos:5901877 size: 150
+ret: 0 st: 0 flags:0 dts: 50.733333 pts: 50.733333 pos:5902027 size: 176
Test seek-extra-mp4 failed. Look at tests/data/fate/seek-extra-mp4.err for details.
make: *** [fate-seek-extra-mp4] Error 1
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
When the tyrant has disposed of foreign enemies by conquest or treaty, and
there is nothing more to fear from them, then he is always stirring up
some war or other, in order that the people may require a leader. -- Plato
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