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vaapi: solve potential problem with ambiguous image formats 

VAAPI has some ambiguous image formats, like VA_FOURCC_I420,
VA_FOURCC_IYUV, VA_FOURCC_YV12 (the latter exactly the same as the first
two, just with swapped planes). There is potentially a problem when one
specific VAAPI format was picked, and converting it to a mpv format and
back to a VAAPI FourCC would result in a numerically different format
(even if it's actually the same). Then it could e.g. happen that
functions like va_surface_upload() reallocate the underlying VAImage,
which would be inefficient. Change the code so that this can't happen.

(Probably not a problem in practice with the current VAAPI usage.)
This commit is contained in:
wm4 2014-03-17 18:23:24 +01:00
parent 123c34a12e
commit 422af1b948
1 changed files with 28 additions and 33 deletions
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57
video/vaapi.c
View File

@ -238,17 +238,16 @@ static void va_surface_image_destroy(struct va_surface *surface)
surface->is_derived = false;
}
static VAImage *va_surface_image_alloc(struct mp_image *img,
VAImageFormat *format)
static int va_surface_image_alloc(struct mp_image *img, VAImageFormat *format)
{
struct va_surface *p = va_surface_in_mp_image(img);
if (!format || !p)
return NULL;
return -1;
VADisplay *display = p->display;
if (p->image.image_id != VA_INVALID_ID &&
p->image.format.fourcc == format->fourcc)
return &p->image;
return 0;
va_surface_image_destroy(p);
@ -270,24 +269,29 @@ static VAImage *va_surface_image_alloc(struct mp_image *img,
status = vaCreateImage(p->display, format, img->w, img->h, &p->image);
if (!CHECK_VA_STATUS(p->ctx, "vaCreateImage()")) {
p->image.image_id = VA_INVALID_ID;
return NULL;
return -1;
}
}
return &p->image;
return 0;
}
// img must be a VAAPI surface; make sure its internal VAImage is allocated
// to a format corresponding to imgfmt (or return an error).
int va_surface_alloc_imgfmt(struct mp_image *img, int imgfmt)
{
struct va_surface *surface = va_surface_in_mp_image(img);
if (!surface)
struct va_surface *p = va_surface_in_mp_image(img);
if (!p)
return -1;
// Multiple FourCCs can refer to the same imgfmt, so check by doing the
// surjective conversion first.
if (p->image.image_id != VA_INVALID_ID &&
va_fourcc_to_imgfmt(p->image.format.fourcc) == imgfmt)
return 0;
VAImageFormat *format =
va_image_format_from_imgfmt(surface->ctx->image_formats, imgfmt);
va_image_format_from_imgfmt(p->ctx->image_formats, imgfmt);
if (!format)
return -1;
if (!va_surface_image_alloc(img, format))
if (va_surface_image_alloc(img, format) < 0)
return -1;
return 0;
}
@ -333,11 +337,7 @@ int va_surface_upload(struct mp_image *va_dst, struct mp_image *sw_src)
if (!p)
return -1;
VAImageFormat *format =
va_image_format_from_imgfmt(p->ctx->image_formats, sw_src->imgfmt);
if (!format)
return -1;
if (!va_surface_image_alloc(va_dst, format))
if (va_surface_alloc_imgfmt(va_dst, sw_src->imgfmt) < 0)
return -1;
struct mp_image img;
@ -359,7 +359,6 @@ int va_surface_upload(struct mp_image *va_dst, struct mp_image *sw_src)
}
static struct mp_image *try_download(struct mp_image *src,
VAImageFormat *format,
struct mp_image_pool *pool)
{
VAStatus status;
@ -367,15 +366,12 @@ static struct mp_image *try_download(struct mp_image *src,
if (!p)
return NULL;
enum mp_imgfmt imgfmt = va_fourcc_to_imgfmt(format->fourcc);
if (imgfmt == IMGFMT_NONE)
return NULL;
if (!va_surface_image_alloc(src, format))
return NULL;
VAImage *image = &p->image;
if (image->image_id == VA_INVALID_ID ||
!va_fourcc_to_imgfmt(image->format.fourcc))
return NULL;
if (!p->is_derived) {
status = vaGetImage(p->display, p->id, 0, 0,
src->w, src->h, image->image_id);
@ -386,15 +382,15 @@ static struct mp_image *try_download(struct mp_image *src,
struct mp_image *dst = NULL;
struct mp_image tmp;
if (va_image_map(p->ctx, image, &tmp)) {
assert(tmp.imgfmt == imgfmt);
dst = pool ? mp_image_pool_get(pool, imgfmt, tmp.w, tmp.h)
: mp_image_alloc(imgfmt, tmp.w, tmp.h);
dst = pool ? mp_image_pool_get(pool, tmp.imgfmt, tmp.w, tmp.h)
: mp_image_alloc(tmp.imgfmt, tmp.w, tmp.h);
mp_image_copy(dst, &tmp);
va_image_unmap(p->ctx, image);
}
return dst;
}
// Return a software copy of the IMGFMT_VAAPI src image.
// pool is optional (used for allocating returned images).
struct mp_image *va_surface_download(struct mp_image *src,
struct mp_image_pool *pool)
@ -407,17 +403,16 @@ struct mp_image *va_surface_download(struct mp_image *src,
if (!CHECK_VA_STATUS(ctx, "vaSyncSurface()"))
return NULL;
VAImage *image = &p->image;
if (image->image_id != VA_INVALID_ID) {
struct mp_image *mpi = try_download(src, &image->format, pool);
struct mp_image *mpi = try_download(src, pool);
if (mpi)
return mpi;
}
// We have no clue which format will work, so try them all.
for (int i = 0; i < ctx->image_formats->num; i++) {
VAImageFormat *format = &ctx->image_formats->entries[i];
struct mp_image *mpi = try_download(src, format, pool);
if (va_surface_image_alloc(src, format) < 0)
continue;
mpi = try_download(src, pool);
if (mpi)
return mpi;
}