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Subject: [FFmpeg-devel] [PATCH] avcodec/h264_mb: Fix buffer stride for arm
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Cc: pengbin@visionular.com
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When decoding a bitstream with weighted-bipred enabled,
the results on ARM and x86 platforms may differ.
The reason for the inconsistency is that the value of
STRIDE_ALIGN differs between platforms. And STRIDE_ALIGN
is set to the buffer stride of temporary buffers for U
and V components in mc_part_weighted.
If the buffer stride is 32 or 64 (as on x86 platforms),
the U and V pixels can be interleaved row by row without
overlapping, resulting in correct output.
However, on ARM platforms where the stride is 16,
the V component will overwrite part of the U component's pixels,
leading to incorrect predicted pixels.
The bug can be reproduced by the following bitstream.
https://trac.ffmpeg.org/attachment/ticket/11357/inter_weighted_bipred2.264
And the ref/fate file is also added in this patch.
Fixes: ticket 11357
Signed-off-by: Bin Peng <pengbin@visionular.com>
---
libavcodec/utils.c | 4 ++-
.../h264-conformance-weighted_bipred2.264 | 31 +++++++++++++++++++
2 files changed, 34 insertions(+), 1 deletion(-)
create mode 100644 tests/ref/fate/h264-conformance-weighted_bipred2.264
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 90867ed6b1..5d15f5c8fa 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -144,6 +144,7 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
int i;
int w_align = 1;
int h_align = 1;
+ int stride_align = STRIDE_ALIGN;
AVPixFmtDescriptor const *desc = av_pix_fmt_desc_get(s->pix_fmt);
if (desc) {
@@ -339,13 +340,14 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
// increasing witdth ensure that the temporary area is large enough,
// the next rounded up width is 32
*width = FFMAX(*width, 32);
+ stride_align = FFMAX(stride_align, 32);
}
if (s->codec_id == AV_CODEC_ID_SVQ3) {
*width = FFMAX(*width, 32);
}
for (i = 0; i < 4; i++)
- linesize_align[i] = STRIDE_ALIGN;
+ linesize_align[i] = stride_align;
}
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
diff --git a/tests/ref/fate/h264-conformance-weighted_bipred2.264 b/tests/ref/fate/h264-conformance-weighted_bipred2.264
new file mode 100644
index 0000000000..1d9bf90d12
--- /dev/null
+++ b/tests/ref/fate/h264-conformance-weighted_bipred2.264
@@ -0,0 +1,31 @@
+#software: Lavf61.1.100
+#tb 0: 1/24
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 32x168
+#sar 0: 0/1
+0, 0, 0, 2, 8064, 0x836abac1
+0, 2, 2, 2, 8064, 0x836abac1
+0, 4, 4, 2, 8064, 0x836abac1
+0, 6, 6, 2, 8064, 0x836abac1
+0, 8, 8, 2, 8064, 0x836abac1
+0, 10, 10, 2, 8064, 0x5fc56e41
+0, 12, 12, 2, 8064, 0x5fc56e41
+0, 14, 14, 2, 8064, 0x5fc56e41
+0, 16, 16, 2, 8064, 0x5fc56e41
+0, 18, 18, 2, 8064, 0x5fc56e41
+0, 20, 20, 2, 8064, 0xbfbb8282
+0, 22, 22, 2, 8064, 0xbfbb8282
+0, 24, 24, 2, 8064, 0x4cbc7d64
+0, 26, 26, 2, 8064, 0x5eaf7bd3
+0, 28, 28, 2, 8064, 0x43956bb8
+0, 30, 30, 2, 8064, 0x047a0f2d
+0, 32, 32, 2, 8064, 0x0d271111
+0, 34, 34, 2, 8064, 0xab421086
+0, 36, 36, 2, 8064, 0x00780fcb
+0, 38, 38, 2, 8064, 0xfd2513c0
+0, 40, 40, 2, 8064, 0xa10b5ae7
+0, 42, 42, 2, 8064, 0xa10b5ae7
+0, 44, 44, 2, 8064, 0xa10b5ae7
+0, 46, 46, 2, 8064, 0xa10b5ae7
+0, 48, 48, 2, 8064, 0xa10b5ae7
--
2.25.1
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