[FFmpeg-devel] [PATCH] avfilter/framepool: fix alignment requirements for audio and video filters

[James Almer]

On 2/20/2022 7:02 PM, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <onemda at gmail.com>
> ---
>   libavfilter/audio.c     | 11 +++++------
>   libavfilter/framepool.c | 16 ++++++----------
>   libavfilter/video.c     | 11 +++++------
>   3 files changed, 16 insertions(+), 22 deletions(-)
> 
> diff --git a/libavfilter/audio.c b/libavfilter/audio.c
> index cebc9709dd..a0408226a3 100644
> --- a/libavfilter/audio.c
> +++ b/libavfilter/audio.c
> @@ -22,15 +22,13 @@
>   #include "libavutil/avassert.h"
>   #include "libavutil/channel_layout.h"
>   #include "libavutil/common.h"
> +#include "libavutil/cpu.h"
>   
>   #include "audio.h"
>   #include "avfilter.h"
>   #include "framepool.h"
>   #include "internal.h"
>   
> -#define BUFFER_ALIGN 0
> -
> -
>   AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
>   {
>       return ff_get_audio_buffer(link->dst->outputs[0], nb_samples);
> @@ -41,12 +39,13 @@ AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples)
>       AVFrame *frame = NULL;
>       int channels = link->channels;
>       int channel_layout_nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
> +    int align = av_cpu_max_align();
>   
>       av_assert0(channels == channel_layout_nb_channels || !channel_layout_nb_channels);
>   
>       if (!link->frame_pool) {
>           link->frame_pool = ff_frame_pool_audio_init(av_buffer_allocz, channels,
> -                                                    nb_samples, link->format, BUFFER_ALIGN);
> +                                                    nb_samples, link->format, align);
>           if (!link->frame_pool)
>               return NULL;
>       } else {
> @@ -62,11 +61,11 @@ AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples)
>           }
>   
>           if (pool_channels != channels || pool_nb_samples < nb_samples ||
> -            pool_format != link->format || pool_align != BUFFER_ALIGN) {
> +            pool_format != link->format || pool_align != align) {
>   
>               ff_frame_pool_uninit((FFFramePool **)&link->frame_pool);
>               link->frame_pool = ff_frame_pool_audio_init(av_buffer_allocz, channels,
> -                                                        nb_samples, link->format, BUFFER_ALIGN);
> +                                                        nb_samples, link->format, align);
>               if (!link->frame_pool)
>                   return NULL;
>           }
> diff --git a/libavfilter/framepool.c b/libavfilter/framepool.c
> index 7c63807df3..ebfd5dc0e0 100644
> --- a/libavfilter/framepool.c
> +++ b/libavfilter/framepool.c
> @@ -76,14 +76,10 @@ FFFramePool *ff_frame_pool_video_init(AVBufferRef* (*alloc)(size_t size),
>       }
>   
>       if (!pool->linesize[0]) {
> -        for(i = 1; i <= align; i += i) {
> -            ret = av_image_fill_linesizes(pool->linesize, pool->format,
> -                                          FFALIGN(pool->width, i));
> -            if (ret < 0) {
> -                goto fail;
> -            }
> -            if (!(pool->linesize[0] & (pool->align - 1)))
> -                break;
> +        ret = av_image_fill_linesizes(pool->linesize, pool->format,
> +                                      FFALIGN(pool->width, align));
> +        if (ret < 0) {
> +            goto fail;
>           }
>   
>           for (i = 0; i < 4 && pool->linesize[i]; i++) {
> @@ -92,11 +88,11 @@ FFFramePool *ff_frame_pool_video_init(AVBufferRef* (*alloc)(size_t size),
>       }
>   
>       for (i = 0; i < 4 && pool->linesize[i]; i++) {
> -        int h = FFALIGN(pool->height, 32);
> +        int h = pool->height;
>           if (i == 1 || i == 2)
>               h = AV_CEIL_RSHIFT(h, desc->log2_chroma_h);
>   
> -        pool->pools[i] = av_buffer_pool_init(pool->linesize[i] * h + 16 + 16 - 1,
> +        pool->pools[i] = av_buffer_pool_init(pool->linesize[i] * h,

Why are you removing the padding on each plane? Just add align padding 
bytes and it should be good.

>                                                alloc);
>           if (!pool->pools[i])
>               goto fail;
> diff --git a/libavfilter/video.c b/libavfilter/video.c
> index 7ef04144e4..fa3d588044 100644
> --- a/libavfilter/video.c
> +++ b/libavfilter/video.c
> @@ -24,6 +24,7 @@
>   #include <stdio.h>
>   
>   #include "libavutil/buffer.h"
> +#include "libavutil/cpu.h"
>   #include "libavutil/hwcontext.h"
>   #include "libavutil/imgutils.h"
>   
> @@ -32,9 +33,6 @@
>   #include "internal.h"
>   #include "video.h"
>   
> -#define BUFFER_ALIGN 32
> -
> -
>   AVFrame *ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
>   {
>       return ff_get_video_buffer(link->dst->outputs[0], w, h);
> @@ -46,6 +44,7 @@ AVFrame *ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
>       int pool_width = 0;
>       int pool_height = 0;
>       int pool_align = 0;
> +    int align = av_cpu_max_align();
>       enum AVPixelFormat pool_format = AV_PIX_FMT_NONE;
>   
>       if (link->hw_frames_ctx &&
> @@ -65,7 +64,7 @@ AVFrame *ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
>   
>       if (!link->frame_pool) {
>           link->frame_pool = ff_frame_pool_video_init(av_buffer_allocz, w, h,
> -                                                    link->format, BUFFER_ALIGN);
> +                                                    link->format, align);
>           if (!link->frame_pool)
>               return NULL;
>       } else {
> @@ -76,11 +75,11 @@ AVFrame *ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
>           }
>   
>           if (pool_width != w || pool_height != h ||
> -            pool_format != link->format || pool_align != BUFFER_ALIGN) {
> +            pool_format != link->format || pool_align != align) {
>   
>               ff_frame_pool_uninit((FFFramePool **)&link->frame_pool);
>               link->frame_pool = ff_frame_pool_video_init(av_buffer_allocz, w, h,
> -                                                        link->format, BUFFER_ALIGN);
> +                                                        link->format, align);
>               if (!link->frame_pool)
>                   return NULL;
>           }