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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
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@ -224,6 +224,16 @@ static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
avio_w8(pb, (uint8_t)(num >> i * 8)); 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) static void put_ebml_uint(AVIOContext *pb, uint32_t elementid, uint64_t val)
{ {
int i, bytes = 1; 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); track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER, put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER,
mkv->is_dash ? mkv->dash_track_number : i + 1); 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) put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
if ((tag = av_dict_get(st->metadata, "title", NULL, 0))) 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); *tag = start_ebml_master(pb, MATROSKA_ID_TAG, 0);
targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0); targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
if (elementid) if (elementid)
put_ebml_uint(pb, elementid, uid); put_ebml_uid(pb, elementid, uid);
end_ebml_master(pb, targets); end_ebml_master(pb, targets);
return 0; return 0;
} }
@ -1682,7 +1692,7 @@ static int mkv_write_attachments(AVFormatContext *s)
put_ebml_string(dyn_cp, MATROSKA_ID_FILEMIMETYPE, mimetype); 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_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(dyn_cp, attached_file);
} }
end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_ATTACHMENTS, 0, 0); end_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_ATTACHMENTS, 0, 0);

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

4
tests/fate/wavpack.mak
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@ -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-$(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: CMD = md5pipe -i $(TARGET_SAMPLES)/wavpack/num_channels/mono_16bit_int.wv -c copy -fflags +bitexact -f matroska
fate-wavpack-matroska_mux-mono: CMP = oneline fate-wavpack-matroska_mux-mono: CMP = oneline
fate-wavpack-matroska_mux-mono: REF = a9da0444604848080b08e32de19f42d9 fate-wavpack-matroska_mux-mono: REF = 7ebd447336f0ba76b41a3f32d1551f05
FATE_WAVPACK-$(call DEMMUX, WV, MATROSKA) += fate-wavpack-matroska_mux-61 FATE_WAVPACK-$(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: 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: CMP = oneline
fate-wavpack-matroska_mux-61: REF = 60812e377937456863a3c899ee068060 fate-wavpack-matroska_mux-61: REF = c95bca3c3023230a324c633942c453d5
FATE_SAMPLES_AVCONV += $(FATE_WAVPACK-yes) FATE_SAMPLES_AVCONV += $(FATE_WAVPACK-yes)
fate-wavpack: $(FATE_WAVPACK-yes) fate-wavpack: $(FATE_WAVPACK-yes)

4
tests/ref/fate/aac-autobsf-adtstoasc
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@ -1,5 +1,5 @@
d10b73732b32f6b2f08885b40c41c77f *tests/data/fate/aac-autobsf-adtstoasc.matroska 9d0c81ce285a84c0137316004d091d95 *tests/data/fate/aac-autobsf-adtstoasc.matroska
6606 tests/data/fate/aac-autobsf-adtstoasc.matroska 6620 tests/data/fate/aac-autobsf-adtstoasc.matroska
#extradata 0: 2, 0x0030001c #extradata 0: 2, 0x0030001c
#tb 0: 1/1000 #tb 0: 1/1000
#media_type 0: audio #media_type 0: audio

2
tests/ref/fate/binsub-mksenc
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@ -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 83aca2772c52f6f802cac288f889382b *tests/data/fate/matroska-flac-extradata-update.matroska
1977 tests/data/fate/matroska-flac-extradata-update.matroska 2019 tests/data/fate/matroska-flac-extradata-update.matroska
#extradata 0: 34, 0x7acb09e7 #extradata 0: 34, 0x7acb09e7
#extradata 1: 34, 0x7acb09e7 #extradata 1: 34, 0x7acb09e7
#extradata 2: 34, 0x443402dd #extradata 2: 34, 0x443402dd

4
tests/ref/fate/rgb24-mkv
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@ -1,5 +1,5 @@
f9feab2a7ed8f1049df1b70982291505 *tests/data/fate/rgb24-mkv.matroska 661b2d8ad9b7c5bf7389d3408c3695c4 *tests/data/fate/rgb24-mkv.matroska
58192 tests/data/fate/rgb24-mkv.matroska 58206 tests/data/fate/rgb24-mkv.matroska
#tb 0: 1/10 #tb 0: 1/10
#media_type 0: video #media_type 0: video
#codec_id 0: rawvideo #codec_id 0: rawvideo

4
tests/ref/lavf-fate/av1.mkv
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@ -1,3 +1,3 @@
be4903a6a6710043383c8f38a535a8d3 *tests/data/lavf-fate/lavf.av1.mkv 339f457b665fb5e8652fd50f2d3c4823 *tests/data/lavf-fate/lavf.av1.mkv
55636 tests/data/lavf-fate/lavf.av1.mkv 55650 tests/data/lavf-fate/lavf.av1.mkv
tests/data/lavf-fate/lavf.av1.mkv CRC=0x7c27cc15 tests/data/lavf-fate/lavf.av1.mkv CRC=0x7c27cc15

4
tests/ref/lavf/mka
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@ -1,3 +1,3 @@
9bd06ae5291de75c19a60c3f39db4c09 *tests/data/lavf/lavf.mka 0d48d93057f14704f6b839bb15e7328a *tests/data/lavf/lavf.mka
43538 tests/data/lavf/lavf.mka 43552 tests/data/lavf/lavf.mka
tests/data/lavf/lavf.mka CRC=0x3a1da17e tests/data/lavf/lavf.mka CRC=0x3a1da17e

4
tests/ref/lavf/mkv
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@ -1,3 +1,3 @@
85ef0666b3ad642221793b1c4f985011 *tests/data/lavf/lavf.mkv 06c38b55305367672a7fc4efb71947bc *tests/data/lavf/lavf.mkv
320418 tests/data/lavf/lavf.mkv 320446 tests/data/lavf/lavf.mkv
tests/data/lavf/lavf.mkv CRC=0xec6c3c68 tests/data/lavf/lavf.mkv CRC=0xec6c3c68

4
tests/ref/lavf/mkv_attachment
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@ -1,3 +1,3 @@
6f68dccaaaf875a0671f47e5b21c8cca *tests/data/lavf/lavf.mkv_attachment cf27537eabb1f4f222e7391aa4f5250d *tests/data/lavf/lavf.mkv_attachment
472566 tests/data/lavf/lavf.mkv_attachment 472601 tests/data/lavf/lavf.mkv_attachment
tests/data/lavf/lavf.mkv_attachment CRC=0xec6c3c68 tests/data/lavf/lavf.mkv_attachment CRC=0xec6c3c68

44
tests/ref/seek/lavf-mkv
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@ -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:-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:-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: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 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:-1 st: 1 flags:0 ts: 2.577000
ret: 0 st: 1 flags:1 ts: 1.471000 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:-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:-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:-1 st: 0 flags:0 ts: 2.153000
ret: 0 st: 0 flags:1 ts: 1.048000 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: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 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:-1 st:-1 flags:0 ts: 1.730004
ret: 0 st:-1 flags:1 ts: 0.624171 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: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 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:-1 st: 1 flags:0 ts: 1.307000
ret: 0 st: 1 flags:1 ts: 0.201000 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:-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:-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: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 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:-1 st: 1 flags:0 ts: 2.672000
ret: 0 st: 1 flags:1 ts: 1.566000 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:-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:-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