[FFmpeg-devel] [PATCH] lavfi: let gcc realign the stack on public graph driving functions

[Hendrik Leppkes]

The functions which actually drive the filter graph by pushing
frames through it need to ensure an aligned stack for SIMD functions.

This fixes a crash in YADIF filter when using a mingw build in a MSVC application.
---
 libavfilter/buffersink.c | 8 ++++----
 libavfilter/buffersrc.c  | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/libavfilter/buffersink.c b/libavfilter/buffersink.c
index 8236f22..9bbc8d9 100644
--- a/libavfilter/buffersink.c
+++ b/libavfilter/buffersink.c
@@ -117,7 +117,7 @@ int av_buffersink_get_frame(AVFilterContext *ctx, AVFrame *frame)
     return av_buffersink_get_frame_flags(ctx, frame, 0);
 }
 
-int av_buffersink_get_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
+int attribute_align_arg av_buffersink_get_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
 {
     BufferSinkContext *buf = ctx->priv;
     AVFilterLink *inlink = ctx->inputs[0];
@@ -169,7 +169,7 @@ static int read_from_fifo(AVFilterContext *ctx, AVFrame *frame,
 
 }
 
-int av_buffersink_get_samples(AVFilterContext *ctx, AVFrame *frame, int nb_samples)
+int attribute_align_arg av_buffersink_get_samples(AVFilterContext *ctx, AVFrame *frame, int nb_samples)
 {
     BufferSinkContext *s = ctx->priv;
     AVFilterLink   *link = ctx->inputs[0];
@@ -264,7 +264,7 @@ static void compat_free_buffer(AVFilterBuffer *buf)
     av_free(buf);
 }
 
-static int compat_read(AVFilterContext *ctx, AVFilterBufferRef **pbuf, int nb_samples, int flags)
+static int attribute_align_arg compat_read(AVFilterContext *ctx, AVFilterBufferRef **pbuf, int nb_samples, int flags)
 {
     AVFilterBufferRef *buf;
     AVFrame *frame;
@@ -348,7 +348,7 @@ AVRational av_buffersink_get_frame_rate(AVFilterContext *ctx)
     return ctx->inputs[0]->frame_rate;
 }
 
-int av_buffersink_poll_frame(AVFilterContext *ctx)
+int attribute_align_arg av_buffersink_poll_frame(AVFilterContext *ctx)
 {
     BufferSinkContext *buf = ctx->priv;
     AVFilterLink *inlink = ctx->inputs[0];
diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
index 80fd2be..54a58fe 100644
--- a/libavfilter/buffersrc.c
+++ b/libavfilter/buffersrc.c
@@ -113,8 +113,8 @@ int av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags
     return ret;
 }
 
-static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,
-                                           AVFrame *frame, int flags)
+static int attribute_align_arg av_buffersrc_add_frame_internal(AVFilterContext *ctx,
+                                                               AVFrame *frame, int flags)
 {
     BufferSourceContext *s = ctx->priv;
     AVFrame *copy;
-- 
1.8.0.msysgit.0