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avformat/matroskaenc: Make output more deterministic

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Using random values for TrackUID and FileUID (as happens when the
AVFMT_FLAG_BITEXACT flag is not set) has the obvious downside of making
the output indeterministic. This commit mitigates this by writing the
potentially random values with a fixed size of eight byte, even if their
actual values would fit into less than eight bytes. This ensures that
even in non-bitexact mode, the differences between two files generated
with the same settings are restricted to a few bytes in the header.
(Namely the SegmentUID, the TrackUIDs (in Tracks as well as when
referencing them via TagTrackUID), the FileUIDs (in Attachments as
well as in TagAttachmentUID) as well as the CRC-32 checksums of the
Info, Tracks, Attachments and Tags level-1-elements.) Without this
patch, there might be an offset/a size difference between two such
files.

The FATE-tests had to be updated because the fixed-sized UIDs are also
used in bitexact mode.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2019-12-29 10:20:42 +01:00
parent 358b58cb29
commit ccadd00a4a
12 changed files with 53 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
libavformat/matroskaenc.c
View File

@ -224,6 +224,16 @@ static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
avio_w8(pb, (uint8_t)(num >> i * 8));
}
/**
* Write a (random) UID with fixed size to make the output more deterministic
*/
static void put_ebml_uid(AVIOContext *pb, uint32_t elementid, uint64_t uid)
{
put_ebml_id(pb, elementid);
put_ebml_num(pb, 8, 0);
avio_wb64(pb, uid);
}
static void put_ebml_uint(AVIOContext *pb, uint32_t elementid, uint64_t val)
{
int i, bytes = 1;
@ -1102,7 +1112,7 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
mkv->is_dash ? mkv->dash_track_number : i + 1);
put_ebml_uint (pb, MATROSKA_ID_TRACKUID, mkv->tracks[i].uid);
put_ebml_uid (pb, MATROSKA_ID_TRACKUID, mkv->tracks[i].uid);
put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
@ -1483,7 +1493,7 @@ static int mkv_write_tag_targets(AVFormatContext *s, uint32_t elementid,
*tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
if (elementid)
put_ebml_uint(pb, elementid, uid);
put_ebml_uid(pb, elementid, uid);
end_ebml_master(pb, targets);
return 0;
}
@ -1682,7 +1692,7 @@ static int mkv_write_attachments(AVFormatContext *s)
put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype);
put_ebml_binary(dyn_cp, MATROSKA_ID_FILEDATA, st->codecpar->extradata, st->codecpar->extradata_size);
put_ebml_uint(dyn_cp, MATROSKA_ID_FILEUID, track->uid);
put_ebml_uid(dyn_cp, MATROSKA_ID_FILEUID, track->uid);
end_ebml_master(dyn_cp, attached_file);
}
end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_ATTACHMENTS, 0, 0);

2
tests/fate/matroska.mak
View File

@ -12,7 +12,7 @@ fate-matroska-prores-header-insertion-bz2: CMD = framecrc -i $(TARGET_SAMPLES)/m
FATE_MATROSKA-$(call DEMMUX, MATROSKA, MATROSKA) += fate-matroska-remux
fate-matroska-remux: CMD = md5pipe -i $(TARGET_SAMPLES)/vp9-test-vectors/vp90-2-2pass-akiyo.webm -color_trc 4 -c:v copy -fflags +bitexact -strict -2 -f matroska
fate-matroska-remux: CMP = oneline
fate-matroska-remux: REF = 49a60ef91cf7302ab7276f9373f8a429
fate-matroska-remux: REF = 8369f24de64aaa52cf57a699dcdc7d58
FATE_MATROSKA-$(call ALLYES, MATROSKA_DEMUXER VORBIS_PARSER) += fate-matroska-xiph-lacing
fate-matroska-xiph-lacing: CMD = framecrc -i $(TARGET_SAMPLES)/mkv/xiph_lacing.mka -c:a copy

4
tests/fate/wavpack.mak
View File

@ -91,12 +91,12 @@ fate-wavpack-matroskamode: CMD = md5 -i $(TARGET_SAMPLES)/wavpack/special/matros
FATE_WAVPACK-$(call DEMMUX, WV, MATROSKA) += fate-wavpack-matroska_mux-mono
fate-wavpack-matroska_mux-mono: CMD = md5pipe -i $(TARGET_SAMPLES)/wavpack/num_channels/mono_16bit_int.wv -c copy -fflags +bitexact -f matroska
fate-wavpack-matroska_mux-mono: CMP = oneline
fate-wavpack-matroska_mux-mono: REF = a9da0444604848080b08e32de19f42d9
fate-wavpack-matroska_mux-mono: REF = 7ebd447336f0ba76b41a3f32d1551f05
FATE_WAVPACK-$(call DEMMUX, WV, MATROSKA) += fate-wavpack-matroska_mux-61
fate-wavpack-matroska_mux-61: CMD = md5pipe -i $(TARGET_SAMPLES)/wavpack/num_channels/eva_2.22_6.1_16bit-partial.wv -c copy -fflags +bitexact -f matroska
fate-wavpack-matroska_mux-61: CMP = oneline
fate-wavpack-matroska_mux-61: REF = 60812e377937456863a3c899ee068060
fate-wavpack-matroska_mux-61: REF = c95bca3c3023230a324c633942c453d5
FATE_SAMPLES_AVCONV += $(FATE_WAVPACK-yes)
fate-wavpack: $(FATE_WAVPACK-yes)

4
tests/ref/fate/aac-autobsf-adtstoasc
View File

@ -1,5 +1,5 @@
d10b73732b32f6b2f08885b40c41c77f *tests/data/fate/aac-autobsf-adtstoasc.matroska
6606 tests/data/fate/aac-autobsf-adtstoasc.matroska
9d0c81ce285a84c0137316004d091d95 *tests/data/fate/aac-autobsf-adtstoasc.matroska
6620 tests/data/fate/aac-autobsf-adtstoasc.matroska
#extradata 0: 2, 0x0030001c
#tb 0: 1/1000
#media_type 0: audio

2
tests/ref/fate/binsub-mksenc
View File

@ -1 +1 @@
03d376cc2e8622e7af540d4d9809dbf7
3dd15fa67a1df541aa89565ceb7047cf

4
tests/ref/fate/matroska-flac-extradata-update
View File

@ -1,5 +1,5 @@
5070c157123b54e218c7e0a45d5606c8 *tests/data/fate/matroska-flac-extradata-update.matroska
1977 tests/data/fate/matroska-flac-extradata-update.matroska
83aca2772c52f6f802cac288f889382b *tests/data/fate/matroska-flac-extradata-update.matroska
2019 tests/data/fate/matroska-flac-extradata-update.matroska
#extradata 0: 34, 0x7acb09e7
#extradata 1: 34, 0x7acb09e7
#extradata 2: 34, 0x443402dd

4
tests/ref/fate/rgb24-mkv
View File

@ -1,5 +1,5 @@
f9feab2a7ed8f1049df1b70982291505 *tests/data/fate/rgb24-mkv.matroska
58192 tests/data/fate/rgb24-mkv.matroska
661b2d8ad9b7c5bf7389d3408c3695c4 *tests/data/fate/rgb24-mkv.matroska
58206 tests/data/fate/rgb24-mkv.matroska
#tb 0: 1/10
#media_type 0: video
#codec_id 0: rawvideo

4
tests/ref/lavf-fate/av1.mkv
View File

@ -1,3 +1,3 @@
be4903a6a6710043383c8f38a535a8d3 *tests/data/lavf-fate/lavf.av1.mkv
55636 tests/data/lavf-fate/lavf.av1.mkv
339f457b665fb5e8652fd50f2d3c4823 *tests/data/lavf-fate/lavf.av1.mkv
55650 tests/data/lavf-fate/lavf.av1.mkv
tests/data/lavf-fate/lavf.av1.mkv CRC=0x7c27cc15

4
tests/ref/lavf/mka
View File

@ -1,3 +1,3 @@
9bd06ae5291de75c19a60c3f39db4c09 *tests/data/lavf/lavf.mka
43538 tests/data/lavf/lavf.mka
0d48d93057f14704f6b839bb15e7328a *tests/data/lavf/lavf.mka
43552 tests/data/lavf/lavf.mka
tests/data/lavf/lavf.mka CRC=0x3a1da17e

4
tests/ref/lavf/mkv
View File

@ -1,3 +1,3 @@
85ef0666b3ad642221793b1c4f985011 *tests/data/lavf/lavf.mkv
320418 tests/data/lavf/lavf.mkv
06c38b55305367672a7fc4efb71947bc *tests/data/lavf/lavf.mkv
320446 tests/data/lavf/lavf.mkv
tests/data/lavf/lavf.mkv CRC=0xec6c3c68

4
tests/ref/lavf/mkv_attachment
View File

@ -1,3 +1,3 @@
6f68dccaaaf875a0671f47e5b21c8cca *tests/data/lavf/lavf.mkv_attachment
472566 tests/data/lavf/lavf.mkv_attachment
cf27537eabb1f4f222e7391aa4f5250d *tests/data/lavf/lavf.mkv_attachment
472601 tests/data/lavf/lavf.mkv_attachment
tests/data/lavf/lavf.mkv_attachment CRC=0xec6c3c68

44
tests/ref/seek/lavf-mkv
View File

@ -1,48 +1,48 @@
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 666 size: 208
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 694 size: 208
ret: 0 st:-1 flags:0 ts:-1.000000
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size: 27837
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size: 27837
ret: 0 st:-1 flags:1 ts: 1.894167
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size: 27834
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
ret: 0 st: 0 flags:0 ts: 0.788000
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size: 27834
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
ret: 0 st: 0 flags:1 ts:-0.317000
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size: 27837
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size: 27837
ret:-1 st: 1 flags:0 ts: 2.577000
ret: 0 st: 1 flags:1 ts: 1.471000
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320139 size: 209
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320167 size: 209
ret: 0 st:-1 flags:0 ts: 0.365002
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146850 size: 27925
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146878 size: 27925
ret: 0 st:-1 flags:1 ts:-0.740831
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size: 27837
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size: 27837
ret:-1 st: 0 flags:0 ts: 2.153000
ret: 0 st: 0 flags:1 ts: 1.048000
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size: 27834
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
ret: 0 st: 1 flags:0 ts:-0.058000
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 666 size: 208
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 694 size: 208
ret: 0 st: 1 flags:1 ts: 2.836000
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320139 size: 209
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320167 size: 209
ret:-1 st:-1 flags:0 ts: 1.730004
ret: 0 st:-1 flags:1 ts: 0.624171
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146850 size: 27925
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146878 size: 27925
ret: 0 st: 0 flags:0 ts:-0.482000
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size: 27837
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size: 27837
ret: 0 st: 0 flags:1 ts: 2.413000
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size: 27834
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
ret:-1 st: 1 flags:0 ts: 1.307000
ret: 0 st: 1 flags:1 ts: 0.201000
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 666 size: 208
ret: 0 st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos: 694 size: 208
ret: 0 st:-1 flags:0 ts:-0.904994
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size: 27837
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size: 27837
ret: 0 st:-1 flags:1 ts: 1.989173
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size: 27834
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
ret: 0 st: 0 flags:0 ts: 0.883000
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292298 size: 27834
ret: 0 st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
ret: 0 st: 0 flags:1 ts:-0.222000
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size: 27837
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size: 27837
ret:-1 st: 1 flags:0 ts: 2.672000
ret: 0 st: 1 flags:1 ts: 1.566000
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320139 size: 209
ret: 0 st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320167 size: 209
ret: 0 st:-1 flags:0 ts: 0.460008
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146850 size: 27925
ret: 0 st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146878 size: 27925
ret: 0 st:-1 flags:1 ts:-0.645825
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 882 size: 27837
ret: 0 st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos: 910 size: 27837