[FFmpeg-devel] [PATCHv3 1/4] avcodec/svq1enc: do not use ambiguous interframe mean symbols

[FFmpeg-devel] [PATCHv3 1/4] avcodec/svq1enc: do not use ambiguous interframe mean symbols

[Peter Ross]

[-- Attachment #1.1: Type: text/plain, Size: 8381 bytes --]

Don't emit interframe mean symbols -128 and 128.
---

v3 patch set changes:
- reordered patchset
- add stds fields around extradata codec ident
- use Lavc codec ident when operating in bitexact mode

 libavcodec/svq1enc.c              |  5 +++++
 tests/ref/seek/vsynth_lena-svq1   | 28 ++++++++++++++--------------
 tests/ref/vsynth/vsynth1-svq1     |  8 ++++----
 tests/ref/vsynth/vsynth2-svq1     |  6 +++---
 tests/ref/vsynth/vsynth3-svq1     |  6 +++---
 tests/ref/vsynth/vsynth_lena-svq1 |  6 +++---
 6 files changed, 32 insertions(+), 27 deletions(-)

diff --git a/libavcodec/svq1enc.c b/libavcodec/svq1enc.c
index 75adbe7ea0..9bd5a04368 100644
--- a/libavcodec/svq1enc.c
+++ b/libavcodec/svq1enc.c
@@ -234,6 +234,11 @@ static int encode_block(SVQ1EncContext *s, uint8_t *src, uint8_t *ref,
         }
     }
 
+    if (best_mean == -128)
+        best_mean = -127;
+    else if (best_mean == 128)
+        best_mean = 127;
+
     split = 0;
     if (best_score > threshold && level) {
         int score  = 0;
diff --git a/tests/ref/seek/vsynth_lena-svq1 b/tests/ref/seek/vsynth_lena-svq1
index 33fe33e916..36c0fb7f4e 100644
--- a/tests/ref/seek/vsynth_lena-svq1
+++ b/tests/ref/seek/vsynth_lena-svq1
@@ -2,49 +2,49 @@ ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
 ret: 0         st:-1 flags:0  ts:-1.000000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
 ret: 0         st:-1 flags:1  ts: 1.894167
-ret: 0         st: 0 flags:1 dts: 1.440000 pts: 1.440000 pos: 517568 size: 25636
+ret: 0         st: 0 flags:1 dts: 1.440000 pts: 1.440000 pos: 517672 size: 25636
 ret: 0         st: 0 flags:0  ts: 0.788359
-ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 326556 size: 23552
+ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 326616 size: 23552
 ret: 0         st: 0 flags:1  ts:-0.317500
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
 ret:-1         st:-1 flags:0  ts: 2.576668
 ret: 0         st:-1 flags:1  ts: 1.470835
-ret: 0         st: 0 flags:1 dts: 1.440000 pts: 1.440000 pos: 517568 size: 25636
+ret: 0         st: 0 flags:1 dts: 1.440000 pts: 1.440000 pos: 517672 size: 25636
 ret: 0         st: 0 flags:0  ts: 0.365000
-ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 157040 size: 21896
+ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 157232 size: 21896
 ret: 0         st: 0 flags:1  ts:-0.740859
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
 ret:-1         st:-1 flags:0  ts: 2.153336
 ret: 0         st:-1 flags:1  ts: 1.047503
-ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 326556 size: 23552
+ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 326616 size: 23552
 ret: 0         st: 0 flags:0  ts:-0.058359
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
 ret: 0         st: 0 flags:1  ts: 2.835859
-ret: 0         st: 0 flags:1 dts: 1.920000 pts: 1.920000 pos: 722804 size: 25888
+ret: 0         st: 0 flags:1 dts: 1.920000 pts: 1.920000 pos: 722884 size: 25888
 ret: 0         st:-1 flags:0  ts: 1.730004
-ret: 0         st: 0 flags:1 dts: 1.920000 pts: 1.920000 pos: 722804 size: 25888
+ret: 0         st: 0 flags:1 dts: 1.920000 pts: 1.920000 pos: 722884 size: 25888
 ret: 0         st:-1 flags:1  ts: 0.624171
-ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 157040 size: 21896
+ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 157232 size: 21896
 ret: 0         st: 0 flags:0  ts:-0.481641
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
 ret: 0         st: 0 flags:1  ts: 2.412500
-ret: 0         st: 0 flags:1 dts: 1.920000 pts: 1.920000 pos: 722804 size: 25888
+ret: 0         st: 0 flags:1 dts: 1.920000 pts: 1.920000 pos: 722884 size: 25888
 ret: 0         st:-1 flags:0  ts: 1.306672
-ret: 0         st: 0 flags:1 dts: 1.440000 pts: 1.440000 pos: 517568 size: 25636
+ret: 0         st: 0 flags:1 dts: 1.440000 pts: 1.440000 pos: 517672 size: 25636
 ret: 0         st:-1 flags:1  ts: 0.200839
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
 ret: 0         st: 0 flags:0  ts:-0.905000
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
 ret: 0         st: 0 flags:1  ts: 1.989141
-ret: 0         st: 0 flags:1 dts: 1.920000 pts: 1.920000 pos: 722804 size: 25888
+ret: 0         st: 0 flags:1 dts: 1.920000 pts: 1.920000 pos: 722884 size: 25888
 ret: 0         st:-1 flags:0  ts: 0.883340
-ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 326556 size: 23552
+ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 326616 size: 23552
 ret: 0         st:-1 flags:1  ts:-0.222493
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
 ret:-1         st: 0 flags:0  ts: 2.671641
 ret: 0         st: 0 flags:1  ts: 1.565859
-ret: 0         st: 0 flags:1 dts: 1.440000 pts: 1.440000 pos: 517568 size: 25636
+ret: 0         st: 0 flags:1 dts: 1.440000 pts: 1.440000 pos: 517672 size: 25636
 ret: 0         st:-1 flags:0  ts: 0.460008
-ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 157040 size: 21896
+ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 157232 size: 21896
 ret: 0         st:-1 flags:1  ts:-0.645825
 ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     36 size: 22300
diff --git a/tests/ref/vsynth/vsynth1-svq1 b/tests/ref/vsynth/vsynth1-svq1
index cb89915d22..e91ef46f17 100644
--- a/tests/ref/vsynth/vsynth1-svq1
+++ b/tests/ref/vsynth/vsynth1-svq1
@@ -1,4 +1,4 @@
-39ec74da265e3ef27756618108641181 *tests/data/fate/vsynth1-svq1.mov
-1334233 tests/data/fate/vsynth1-svq1.mov
-9cc35c54b2c77d36bd7e308b393c1f81 *tests/data/fate/vsynth1-svq1.out.rawvideo
-stddev:    9.58 PSNR: 28.50 MAXDIFF:  210 bytes:  7603200/  7603200
+78cdca850b19faf3aac0b0682207451e *tests/data/fate/vsynth1-svq1.mov
+1333541 tests/data/fate/vsynth1-svq1.mov
+0b9ee47ee4bf735fe3697daad64fc409 *tests/data/fate/vsynth1-svq1.out.rawvideo
+stddev:    9.57 PSNR: 28.50 MAXDIFF:  210 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth/vsynth2-svq1 b/tests/ref/vsynth/vsynth2-svq1
index 4a50775501..b50ba45e20 100644
--- a/tests/ref/vsynth/vsynth2-svq1
+++ b/tests/ref/vsynth/vsynth2-svq1
@@ -1,4 +1,4 @@
-1c12440c323bc8ace5464587b5369c4a *tests/data/fate/vsynth2-svq1.mov
-940289 tests/data/fate/vsynth2-svq1.mov
-a8cd3b833cd7f570ddbf1e6b3eb125b6 *tests/data/fate/vsynth2-svq1.out.rawvideo
+42578021105a2f526179c5601e635312 *tests/data/fate/vsynth2-svq1.mov
+940337 tests/data/fate/vsynth2-svq1.mov
+ba8f6b721a8e19fe8a6ef92a8cff7479 *tests/data/fate/vsynth2-svq1.out.rawvideo
 stddev:    3.71 PSNR: 36.72 MAXDIFF:  210 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth/vsynth3-svq1 b/tests/ref/vsynth/vsynth3-svq1
index e760abbdb4..ba1d3d5082 100644
--- a/tests/ref/vsynth/vsynth3-svq1
+++ b/tests/ref/vsynth/vsynth3-svq1
@@ -1,4 +1,4 @@
-1972e0df8be667443992e405cceec291 *tests/data/fate/vsynth3-svq1.mov
-40773 tests/data/fate/vsynth3-svq1.mov
-a1e5334cf67649bf8c7d95dc4d1bf148 *tests/data/fate/vsynth3-svq1.out.rawvideo
+03805cb764c00c2162b2bed24b7f34bd *tests/data/fate/vsynth3-svq1.mov
+40757 tests/data/fate/vsynth3-svq1.mov
+a99efde992a2e3efcc085ecc6920a1e3 *tests/data/fate/vsynth3-svq1.out.rawvideo
 stddev:   14.49 PSNR: 24.91 MAXDIFF:  183 bytes:    86700/    86700
diff --git a/tests/ref/vsynth/vsynth_lena-svq1 b/tests/ref/vsynth/vsynth_lena-svq1
index 01c1b06c74..94f260865a 100644
--- a/tests/ref/vsynth/vsynth_lena-svq1
+++ b/tests/ref/vsynth/vsynth_lena-svq1
@@ -1,4 +1,4 @@
-a6398d8fd306cfe96dc41060335e67e8 *tests/data/fate/vsynth_lena-svq1.mov
-766701 tests/data/fate/vsynth_lena-svq1.mov
-aa03471dac3f49455a33a2b19fda1098 *tests/data/fate/vsynth_lena-svq1.out.rawvideo
+7534b2c6b7fc7201f193e9b4514cdb90 *tests/data/fate/vsynth_lena-svq1.mov
+766817 tests/data/fate/vsynth_lena-svq1.mov
+85261558fa744ef468fe77dbe4d91d8d *tests/data/fate/vsynth_lena-svq1.out.rawvideo
 stddev:    3.23 PSNR: 37.93 MAXDIFF:   61 bytes:  7603200/  7603200
-- 
2.35.1

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)

[-- Attachment #1.2: signature.asc --]
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[FFmpeg-devel] [PATCHv3 2/4] avcodec/svq1enc: output ident string in extradata field

[Peter Ross]

[-- Attachment #1.1: Type: text/plain, Size: 4156 bytes --]

This will enable the acurate identification of FFmpeg produced
SVQ1 streams, should there be new bugs found in the encoder.
---
 libavcodec/svq1enc.c              | 16 +++++++++++++++-
 tests/ref/vsynth/vsynth1-svq1     |  4 ++--
 tests/ref/vsynth/vsynth2-svq1     |  4 ++--
 tests/ref/vsynth/vsynth3-svq1     |  4 ++--
 tests/ref/vsynth/vsynth_lena-svq1 |  4 ++--
 5 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/libavcodec/svq1enc.c b/libavcodec/svq1enc.c
index 9bd5a04368..73c85bff6b 100644
--- a/libavcodec/svq1enc.c
+++ b/libavcodec/svq1enc.c
@@ -41,6 +41,7 @@
 #include "svq1.h"
 #include "svq1encdsp.h"
 #include "svq1enc_cb.h"
+#include "version.h"
 
 #include "libavutil/avassert.h"
 #include "libavutil/frame.h"
@@ -567,6 +568,19 @@ static av_cold int svq1_encode_end(AVCodecContext *avctx)
     return 0;
 }
 
+static av_cold int write_ident(AVCodecContext *avctx, const char *ident)
+{
+    int size = strlen(ident);
+    avctx->extradata = av_malloc(size + 8);
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
+    AV_WB32(avctx->extradata, size + 8);
+    AV_WL32(avctx->extradata + 4, MKTAG('S', 'V', 'Q', '1'));
+    memcpy(avctx->extradata + 8, ident, size);
+    avctx->extradata_size = size + 8;
+    return 0;
+}
+
 static av_cold int svq1_encode_init(AVCodecContext *avctx)
 {
     SVQ1EncContext *const s = avctx->priv_data;
@@ -628,7 +642,7 @@ static av_cold int svq1_encode_init(AVCodecContext *avctx)
 
     ff_h263_encode_init(&s->m); // mv_penalty
 
-    return 0;
+    return write_ident(avctx, s->avctx->flags & AV_CODEC_FLAG_BITEXACT ? "Lavc" : LIBAVCODEC_IDENT);
 }
 
 static int svq1_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
diff --git a/tests/ref/vsynth/vsynth1-svq1 b/tests/ref/vsynth/vsynth1-svq1
index e91ef46f17..6a517f6b7b 100644
--- a/tests/ref/vsynth/vsynth1-svq1
+++ b/tests/ref/vsynth/vsynth1-svq1
@@ -1,4 +1,4 @@
-78cdca850b19faf3aac0b0682207451e *tests/data/fate/vsynth1-svq1.mov
-1333541 tests/data/fate/vsynth1-svq1.mov
+89b1ec4d7bbee1ed2710c8cc8c1e269d *tests/data/fate/vsynth1-svq1.mov
+1333561 tests/data/fate/vsynth1-svq1.mov
 0b9ee47ee4bf735fe3697daad64fc409 *tests/data/fate/vsynth1-svq1.out.rawvideo
 stddev:    9.57 PSNR: 28.50 MAXDIFF:  210 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth/vsynth2-svq1 b/tests/ref/vsynth/vsynth2-svq1
index b50ba45e20..01d78bd279 100644
--- a/tests/ref/vsynth/vsynth2-svq1
+++ b/tests/ref/vsynth/vsynth2-svq1
@@ -1,4 +1,4 @@
-42578021105a2f526179c5601e635312 *tests/data/fate/vsynth2-svq1.mov
-940337 tests/data/fate/vsynth2-svq1.mov
+14f355a06d475dcf6a90ac6ab3ae2970 *tests/data/fate/vsynth2-svq1.mov
+940357 tests/data/fate/vsynth2-svq1.mov
 ba8f6b721a8e19fe8a6ef92a8cff7479 *tests/data/fate/vsynth2-svq1.out.rawvideo
 stddev:    3.71 PSNR: 36.72 MAXDIFF:  210 bytes:  7603200/  7603200
diff --git a/tests/ref/vsynth/vsynth3-svq1 b/tests/ref/vsynth/vsynth3-svq1
index ba1d3d5082..05fd497336 100644
--- a/tests/ref/vsynth/vsynth3-svq1
+++ b/tests/ref/vsynth/vsynth3-svq1
@@ -1,4 +1,4 @@
-03805cb764c00c2162b2bed24b7f34bd *tests/data/fate/vsynth3-svq1.mov
-40757 tests/data/fate/vsynth3-svq1.mov
+969dcdd69774b9c42dcf81e8dd393364 *tests/data/fate/vsynth3-svq1.mov
+40777 tests/data/fate/vsynth3-svq1.mov
 a99efde992a2e3efcc085ecc6920a1e3 *tests/data/fate/vsynth3-svq1.out.rawvideo
 stddev:   14.49 PSNR: 24.91 MAXDIFF:  183 bytes:    86700/    86700
diff --git a/tests/ref/vsynth/vsynth_lena-svq1 b/tests/ref/vsynth/vsynth_lena-svq1
index 94f260865a..0889eba5bb 100644
--- a/tests/ref/vsynth/vsynth_lena-svq1
+++ b/tests/ref/vsynth/vsynth_lena-svq1
@@ -1,4 +1,4 @@
-7534b2c6b7fc7201f193e9b4514cdb90 *tests/data/fate/vsynth_lena-svq1.mov
-766817 tests/data/fate/vsynth_lena-svq1.mov
+8890d9ca13934391b6891ac5f67897c6 *tests/data/fate/vsynth_lena-svq1.mov
+766837 tests/data/fate/vsynth_lena-svq1.mov
 85261558fa744ef468fe77dbe4d91d8d *tests/data/fate/vsynth_lena-svq1.out.rawvideo
 stddev:    3.23 PSNR: 37.93 MAXDIFF:   61 bytes:  7603200/  7603200
-- 
2.35.1

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)

[-- Attachment #1.2: signature.asc --]
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[-- Attachment #2: Type: text/plain, Size: 251 bytes --]

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[FFmpeg-devel] [PATCHv3 3/4] avcodec/svq1: fix interframe mean VLC symbols

[Peter Ross]

[-- Attachment #1.1: Type: text/plain, Size: 4319 bytes --]

Fixes ticket #128.

The SVQ1 interframe mean VLC symbols -128 and 128 are incorrectly swapped
in our SVQ1 implementation, resulting in visible artifacts for some videos.
This patch unswaps the order of these two symbols.

The most noticable example of the artiacts caused by this error can be observed in
https://trac.ffmpeg.org/attachment/ticket/128/svq1_set.7z '352_288_k_50.mov'.
The artifacts are not observed when using the reference decoder
(QuickTime 7.7.9 x86 binary).

As a result of this patch, the reference data for the fate-svq1 test
($SAMPLES/svq1/marymary-shackles.mov) must be modified. For this file, our
decoder output is now bitwise identical to the reference decoder. I have
tested patch with various other samples and they are all now bitwise identical.
---
 libavcodec/svq1_vlc.h |  4 ++--
 tests/ref/fate/svq1   | 22 +++++++++++-----------
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/libavcodec/svq1_vlc.h b/libavcodec/svq1_vlc.h
index 06e3509e4d..5c27928c2a 100644
--- a/libavcodec/svq1_vlc.h
+++ b/libavcodec/svq1_vlc.h
@@ -167,7 +167,7 @@ const uint16_t ff_svq1_inter_mean_vlc[512][2] = {
     { 0xA0, 22 },  { 0xA1, 22 },  { 0xA2, 22 },  { 0xA3, 22 },
     { 0xA4, 22 },  { 0xA5, 22 },  { 0xA6, 22 },  { 0xA7, 22 },
     { 0xA8, 22 },  { 0xA9, 22 },  { 0xAA, 22 },  { 0xAB, 22 },
-    { 0x7F, 22 },  { 0x8F, 21 },  { 0xAC, 22 },  { 0xAD, 22 },
+    { 0x8E, 21 },  { 0x8F, 21 },  { 0xAC, 22 },  { 0xAD, 22 },
     { 0xAE, 22 },  { 0xAF, 22 },  { 0xB0, 22 },  { 0xB1, 22 },
     { 0x53, 20 },  { 0x90, 21 },  { 0xB2, 22 },  { 0x91, 21 },
     { 0xB3, 22 },  { 0xB4, 22 },  { 0x54, 20 },  { 0xB5, 22 },
@@ -231,7 +231,7 @@ const uint16_t ff_svq1_inter_mean_vlc[512][2] = {
     { 0x87, 21 },  { 0x4F, 20 },  { 0x35, 19 },  { 0x4E, 20 },
     { 0x33, 19 },  { 0x32, 19 },  { 0x4D, 20 },  { 0x4C, 20 },
     { 0x83, 22 },  { 0x4B, 20 },  { 0x81, 22 },  { 0x80, 22 },
-    { 0x8E, 21 },  { 0x7E, 22 },  { 0x7D, 22 },  { 0x84, 21 },
+    { 0x7F, 22 },  { 0x7E, 22 },  { 0x7D, 22 },  { 0x84, 21 },
     { 0x8D, 21 },  { 0x7A, 22 },  { 0x79, 22 },  { 0x4A, 20 },
     { 0x77, 22 },  { 0x76, 22 },  { 0x89, 21 },  { 0x74, 22 },
     { 0x73, 22 },  { 0x72, 22 },  { 0x49, 20 },  { 0x70, 22 },
diff --git a/tests/ref/fate/svq1 b/tests/ref/fate/svq1
index d53e2952e4..0b0948cce6 100644
--- a/tests/ref/fate/svq1
+++ b/tests/ref/fate/svq1
@@ -24,19 +24,19 @@
 0,         18,         18,        1,    21600, 0x8d5b2ad0
 0,         19,         19,        1,    21600, 0xe67128e6
 0,         20,         20,        1,    21600, 0xb7bf613e
-0,         21,         21,        1,    21600, 0xefd0f51b
-0,         22,         22,        1,    21600, 0x31b7da59
+0,         21,         21,        1,    21600, 0xf697fa3e
+0,         22,         22,        1,    21600, 0x5b6ede88
 0,         23,         23,        1,    21600, 0x7a84a8f7
 0,         24,         24,        1,    21600, 0x0351ad27
-0,         25,         25,        1,    21600, 0xed6f434d
-0,         26,         26,        1,    21600, 0x0e771127
-0,         27,         27,        1,    21600, 0x37bf0b95
-0,         28,         28,        1,    21600, 0x30e10a77
-0,         29,         29,        1,    21600, 0x1a48288a
-0,         30,         30,        1,    21600, 0xf43c6770
-0,         31,         31,        1,    21600, 0x3c43ae68
-0,         32,         32,        1,    21600, 0x04dc0949
-0,         33,         33,        1,    21600, 0x7920758d
+0,         25,         25,        1,    21600, 0x57b547c2
+0,         26,         26,        1,    21600, 0xbb9e1558
+0,         27,         27,        1,    21600, 0xcb470f6b
+0,         28,         28,        1,    21600, 0xeb100de0
+0,         29,         29,        1,    21600, 0x089c2bf0
+0,         30,         30,        1,    21600, 0xe27b6a42
+0,         31,         31,        1,    21600, 0xbfe2b11b
+0,         32,         32,        1,    21600, 0xd9ca0bb5
+0,         33,         33,        1,    21600, 0x12fe783c
 0,         34,         34,        1,    21600, 0x6c12bab5
 0,         35,         35,        1,    21600, 0x1ac23706
 0,         36,         36,        1,    21600, 0x7a95cb5f
-- 
2.35.1

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)

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[FFmpeg-devel] [PATCHv3 4/4] avcodec/svq1dec: detect buggy FFmpeg encoder and apply correction to interframe mean symbols

[Peter Ross]

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---
 libavcodec/svq1dec.c | 32 +++++++++++++++++++++++---------
 1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/libavcodec/svq1dec.c b/libavcodec/svq1dec.c
index 828b38b93d..c7269456e2 100644
--- a/libavcodec/svq1dec.c
+++ b/libavcodec/svq1dec.c
@@ -73,6 +73,8 @@ typedef struct SVQ1Context {
     int height;
     int frame_code;
     int nonref;         // 1 if the current frame won't be referenced
+
+    int last_tempref;
 } SVQ1Context;
 
 static const uint8_t string_table[256] = {
@@ -229,7 +231,7 @@ static int svq1_decode_block_intra(GetBitContext *bitbuf, uint8_t *pixels,
 }
 
 static int svq1_decode_block_non_intra(GetBitContext *bitbuf, uint8_t *pixels,
-                                       ptrdiff_t pitch)
+                                       ptrdiff_t pitch, int buggy)
 {
     uint32_t bit_cache;
     uint8_t *list[63];
@@ -270,6 +272,13 @@ static int svq1_decode_block_non_intra(GetBitContext *bitbuf, uint8_t *pixels,
 
         mean = get_vlc2(bitbuf, svq1_inter_mean.table, 9, 3) - 256;
 
+        if (buggy) {
+            if (mean == -128)
+                mean = 128;
+            else if (mean == 128)
+                mean = -128;
+        }
+
         SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_inter_codebooks);
 
         for (y = 0; y < height; y++) {
@@ -455,7 +464,7 @@ static int svq1_decode_delta_block(AVCodecContext *avctx, HpelDSPContext *hdsp,
                                    GetBitContext *bitbuf,
                                    uint8_t *current, uint8_t *previous,
                                    ptrdiff_t pitch, svq1_pmv *motion, int x, int y,
-                                   int width, int height)
+                                   int width, int height, int buggy)
 {
     uint32_t block_type;
     int result = 0;
@@ -487,7 +496,7 @@ static int svq1_decode_delta_block(AVCodecContext *avctx, HpelDSPContext *hdsp,
             ff_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result);
             break;
         }
-        result = svq1_decode_block_non_intra(bitbuf, current, pitch);
+        result = svq1_decode_block_non_intra(bitbuf, current, pitch, buggy);
         break;
 
     case SVQ1_BLOCK_INTER_4V:
@@ -498,7 +507,7 @@ static int svq1_decode_delta_block(AVCodecContext *avctx, HpelDSPContext *hdsp,
             ff_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result);
             break;
         }
-        result = svq1_decode_block_non_intra(bitbuf, current, pitch);
+        result = svq1_decode_block_non_intra(bitbuf, current, pitch, buggy);
         break;
 
     case SVQ1_BLOCK_INTRA:
@@ -524,15 +533,18 @@ static void svq1_parse_string(GetBitContext *bitbuf, uint8_t out[257])
     out[i] = 0;
 }
 
-static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame)
+static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame, int * buggy)
 {
     SVQ1Context *s = avctx->priv_data;
     GetBitContext *bitbuf = &s->gb;
     int frame_size_code;
     int width  = s->width;
     int height = s->height;
+    int tempref;
 
-    skip_bits(bitbuf, 8); /* temporal_reference */
+    tempref = get_bits(bitbuf, 8); /* temporal_reference */
+    *buggy = tempref == 0 && s->last_tempref == 0 && avctx->extradata_size == 0;
+    s->last_tempref = tempref;
 
     /* frame type */
     s->nonref = 0;
@@ -624,7 +636,7 @@ static int svq1_decode_frame(AVCodecContext *avctx, AVFrame *cur,
     int buf_size       = avpkt->size;
     SVQ1Context     *s = avctx->priv_data;
     uint8_t *current;
-    int result, i, x, y, width, height;
+    int result, i, x, y, width, height, buggy;
     int ret;
 
     /* initialize bit buffer */
@@ -664,7 +676,7 @@ static int svq1_decode_frame(AVCodecContext *avctx, AVFrame *cur,
             src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];
     }
 
-    result = svq1_decode_frame_header(avctx, cur);
+    result = svq1_decode_frame_header(avctx, cur, &buggy);
     if (result != 0) {
         ff_dlog(avctx, "Error in svq1_decode_frame_header %i\n", result);
         return result;
@@ -734,7 +746,7 @@ static int svq1_decode_frame(AVCodecContext *avctx, AVFrame *cur,
                     result = svq1_decode_delta_block(avctx, &s->hdsp,
                                                      &s->gb, &current[x],
                                                      previous, linesize,
-                                                     s->pmv, x, y, width, height);
+                                                     s->pmv, x, y, width, height, buggy);
                     if (result != 0) {
                         ff_dlog(avctx,
                                 "Error in svq1_decode_delta_block %i\n",
@@ -820,6 +832,8 @@ static av_cold int svq1_decode_init(AVCodecContext *avctx)
 
     ff_thread_once(&init_static_once, svq1_static_init);
 
+    s->last_tempref = 0xFF;
+
     return 0;
 }
 
-- 
2.35.1

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)

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Re: [FFmpeg-devel] [PATCHv3 1/4] avcodec/svq1enc: do not use ambiguous interframe mean symbols

[Peter Ross]

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On Tue, Oct 25, 2022 at 08:17:04PM +1100, Peter Ross wrote:
> Don't emit interframe mean symbols -128 and 128.
> ---
> 
> v3 patch set changes:
> - reordered patchset
> - add stds fields around extradata codec ident
> - use Lavc codec ident when operating in bitexact mode
> 
>  libavcodec/svq1enc.c              |  5 +++++
>  tests/ref/seek/vsynth_lena-svq1   | 28 ++++++++++++++--------------
>  tests/ref/vsynth/vsynth1-svq1     |  8 ++++----
>  tests/ref/vsynth/vsynth2-svq1     |  6 +++---
>  tests/ref/vsynth/vsynth3-svq1     |  6 +++---
>  tests/ref/vsynth/vsynth_lena-svq1 |  6 +++---
>  6 files changed, 32 insertions(+), 27 deletions(-)
> 
> diff --git a/libavcodec/svq1enc.c b/libavcodec/svq1enc.c
> index 75adbe7ea0..9bd5a04368 100644
> --- a/libavcodec/svq1enc.c
> +++ b/libavcodec/svq1enc.c

will push in a couple of days

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)

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