PR #21509 opened by michaelni URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21509 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21509.patch
Add a av_malloc() that adds padding like AV_INPUT_BUFFER_PADDING_SIZE and clears it. This is a operation we commonly use so this function should simplify many cases Signed-off-by: Michael Niedermayer <[email protected]> >From cc424b2a5568ee35a3435ff58a84d2a18c1c6843 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer <[email protected]> Date: Mon, 19 Jan 2026 05:15:23 +0100 Subject: [PATCH] avutil/mem: Add av_malloc_with_paddingz() Add a av_malloc() that adds padding like AV_INPUT_BUFFER_PADDING_SIZE and clears it. This is a operation we commonly use so this function should simplify many cases Signed-off-by: Michael Niedermayer <[email protected]> --- libavutil/mem.c | 10 ++++++++++ libavutil/mem.h | 13 +++++++++++++ 2 files changed, 23 insertions(+) diff --git a/libavutil/mem.c b/libavutil/mem.c index b205d3fb25..aac7ef4d12 100644 --- a/libavutil/mem.c +++ b/libavutil/mem.c @@ -261,6 +261,16 @@ void *av_mallocz(size_t size) return ptr; } +void *av_malloc_with_paddingz(size_t size, size_t padding) +{ + if (size > SIZE_MAX - padding) + return NULL; + uint8_t *p = av_malloc(size + padding); + if(p) + memset(p + size, 0, padding); + return p; +} + void *av_calloc(size_t nmemb, size_t size) { size_t result; diff --git a/libavutil/mem.h b/libavutil/mem.h index ab7648ac57..6a4c144f18 100644 --- a/libavutil/mem.h +++ b/libavutil/mem.h @@ -129,6 +129,19 @@ void *av_malloc(size_t size) av_malloc_attrib av_alloc_size(1); */ void *av_mallocz(size_t size) av_malloc_attrib av_alloc_size(1); +/** + * Allocate a memory block with alignment suitable for all memory accesses + * (including vectors if available on the CPU) + * + * An additional padding will be allocated and cleared. + * + * @param size Size in bytes for the memory block to be allocated + * @param padding Size in bytes of padding allocated and zeroed after size. + * @return Pointer to the allocated block, or `NULL` if it cannot be allocated + * @see av_malloc() + */ +void *av_malloc_with_paddingz(size_t size, size_t padding) av_malloc_attrib av_alloc_size(1); + /** * Allocate a memory block for an array with av_malloc(). * -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
