Comments (3)
Yes, definitely.
I am planning to stubbornly keep my basic avifDecoderRead() as a braindead-simple path for people that aren't trying to use image sequences or squeak out extra performance, as it allows for avifImage objects to be decoupled almost entirely from encoders and decoders.
That said, I'm in the process now of putting in image sequence support, and a side effect of that medium-sized code reorg, I'm planning to make avifDecoderRead() simply call 3-4 other avifDecoder functions which ends up with a copy of the first image, with functions that perform something like:
- Begin the decode/parse
- "get" the first image, which will be owned by the decoder (decoder->image will be a not-copied avifImage)
- "copy" decoder->image into the passed in image ptr
I plan to reuse the decoder->image structure as you "get" the next image, so if you want YUV copies of multiple frames, you're going to have to copy it anyways, but I imagine you just want to take the current decoder->image and run it through your own YUV->RGB pipeline, in which decoder->image can be safely reused, right?
from libavif.
That break up sounds good.
Yes in the ideal case we can output directly to YUV8 planes, but we can't reuse the buffers from dav1d/libavif for that. We do have to copy into them. In the less ideal case (where RBG8/RGB_F16) is required we have to convert into a new structure.
So I don't think we can ever get to a zero copy solution, but a one copy one would be fine too.
from libavif.
This is done, see the Advanced Decoding section of the README.
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Related Issues (20)
- MSVC: avifsampletransformtest.cc(153): warning C4244: 'argument': conversion from 'const avifSampleTransformTokenType' to 'uint8_t', possible loss of data
- Seemingly uncommon use of $<BUILD_INTERFACE> generator expressions in target_compile_options() HOT 2
- In a shared library build, avifincrtest is linked with both the libavif shared and static libraries. HOT 1
- Windows linker error LNK2019: unresolved external symbol __imp_avifGainMapMetadataDoubleToFractions referenced in function avifJPEGParseGainMapXMPProperties HOT 3
- In libavif v1.1.0, only the source files in the avif_obj and avif_apps_obj OBJECT libraries are compiled with warnings enabled HOT 1
- Consider setting the CMAKE_MSVC_RUNTIME_LIBRARY variable to use /MD in all build configurations on Windows
- Investigate whether we still need to compile with /source-charset:utf-8 /execution-charset:us-ascii on Windows HOT 5
- Consider using the MSVC linker option /WX if the AVIF_ENABLE_WERROR cmake option is ON HOT 1
- Consider enabling compiler warnings in add_avif_fuzztest() in tests/CMakeLists.txt HOT 3
- Consider testing __STDC_VERSION__ >= 202000L in avif.h for C compiler's [[nodiscard]] support HOT 1
- Audit and fix integer overflows in multiplications with rowBytes in src/reformat.c
- gtest/avif_fuzztest_helpers.cc is compiled once for each fuzztest target
- Fix the limitation of recent-cmake in the setup-common GitHub action HOT 1
- CMAKE_CXX_FLAGS_RELEASE is empty if -DAVIF_CODEC_AOM=LOCAL -DAVIF_LIBYUV=OFF is specified HOT 8
- Check version numbers of boxes related to the ISO gain map experimental feature HOT 17
- Feature request: separate out encoding of chroma & alpha HOT 4
- Add/handle 'tmap' brand
- android jni compile HOT 4
- supported_gainmap_writer_version_with_extra_bytes.avif is invalid HOT 5
- Implement the HDR parts of SlimHEIF
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from libavif.