Pre-allocate CCSO search buffers - #5323
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Replace per-frame calloc/free in av2_ccso_search with persistent buffers on AV2_COMP, freed at encoder close. No bitstream impact.
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Replace per-frame calloc/free in av2_ccso_search with persistent buffers on AV2_COMP, freed at encoder close. No bitstream impact.
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Replace per-frame calloc/free in av2_ccso_search with persistent buffers on AV2_COMP, freed at encoder close. No bitstream impact.