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Mon, 19 Jan 2026 00:44:32 -0800 (PST) MIME-Version: 1.0 References: <176879650591.25.13669090667799477890@4457048688e7> In-Reply-To: <176879650591.25.13669090667799477890@4457048688e7> Date: Mon, 19 Jan 2026 08:44:23 +0000 X-Gm-Features: AZwV_Qhvvr1u1NAKaQ4ATHxrXGCIQzYavKr3Ix2Y0yfZbPh--dhWgz15I3FbGSs Message-ID: To: FFmpeg development discussions and patches Message-ID-Hash: GNDWAJVYGPX3OD5YJLSUP656UQ7W3AIP X-Message-ID-Hash: GNDWAJVYGPX3OD5YJLSUP656UQ7W3AIP X-MailFrom: SRS0=hMmM=7Y=googlemail.com=kieran618@ffmpeg.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-ffmpeg-devel.ffmpeg.org-0; header-match-ffmpeg-devel.ffmpeg.org-1; header-match-ffmpeg-devel.ffmpeg.org-2; header-match-ffmpeg-devel.ffmpeg.org-3; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Content-Filtered-By: Mailman/MimeDel 3.3.10 X-Mailman-Version: 3.3.10 Precedence: list Reply-To: FFmpeg development discussions and patches Subject: [FFmpeg-devel] Re: [PR] avutil/mem: Add av_malloc_with_paddingz() (PR #21509) List-Id: FFmpeg development discussions and patches Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Kieran Kunhya via ffmpeg-devel Cc: michaelni , Kieran Kunhya Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Archived-At: List-Archive: List-Post: On Mon, 19 Jan 2026, 04:22 michaelni via ffmpeg-devel, < ffmpeg-devel@ffmpeg.org> wrote: > 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 > > > >From cc424b2a5568ee35a3435ff58a84d2a18c1c6843 Mon Sep 17 00:00:00 2001 > From: Michael Niedermayer > 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 > --- > 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 -- ffmpeg-devel@ffmpeg.org > To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org Seems a bit wordy. av_malloc_paddedz instead? Kieran _______________________________________________ ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org