On 1/2/2025 7:39 PM, Ronald S. Bultje wrote:
--- libavcodec/avcodec.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index 12e6e8749f..7ecb819dae 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -1199,7 +1199,8 @@ typedef struct AVCodecContext { * some other means. * * Each data plane must be aligned to the maximum required by the target - * CPU. + * CPU. In addition, each data plane must be padded by that same amount + * plus 15 bytes.
IMO, remove the 15 bytes part. Even if the default allocator adds those, asking for max_cpu_align padding bytes should be more than enough.
And for that matter, see fuzz_video_get_buffer() in tools/target_dec_fuzzer.c, where no such thing is done precisely to simulate what a user reading this doxy might do with their own custom callback. This padding should in theory not be a requirement when avcodec_align_dimensions2() is documented as handling this stuff.
Maybe avcodec_align_dimensions2() should be updated for VP9 to overallocate? I see it does for h264, vp6 and many other codecs where the native decoder overreads for different reasons.
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