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kmsgrab: Use invalid modifier if modifiers weren't used.

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The kernel defaults to initializing the field to 0 when modifiers
are not used and this happens to be linear. If we end up actually
passing the modifier to a driver, tiling issues happen.

So if the kernel doesn't return a modifier set it explicitly to
INVALID. That way later processing knows there is no explicit
modifier.

Signed-off-by: Mark Thompson <sw@jkqxz.net>
This commit is contained in:
Bas Nieuwenhuizen 2020-11-14 00:15:46 +01:00 committed by Mark Thompson
parent 06a8596825
commit 03f4b203ba
1 changed files with 17 additions and 10 deletions
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27
libavdevice/kmsgrab.c
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@ -160,6 +160,7 @@ static int kmsgrab_get_fb2(AVFormatContext *avctx,
KMSGrabContext *ctx = avctx->priv_data;
drmModeFB2 *fb;
int err, i, nb_objects;
uint64_t modifier = ctx->drm_format_modifier;
fb = drmModeGetFB2(ctx->hwctx->fd, plane->fb_id);
if (!fb) {
@ -195,6 +196,9 @@ static int kmsgrab_get_fb2(AVFormatContext *avctx,
goto fail;
}
if (fb->flags & DRM_MODE_FB_MODIFIERS)
modifier = fb->modifier;
*desc = (AVDRMFrameDescriptor) {
.nb_layers = 1,
.layers[0] = {
@ -243,7 +247,7 @@ static int kmsgrab_get_fb2(AVFormatContext *avctx,
desc->objects[obj] = (AVDRMObjectDescriptor) {
.fd = fd,
.size = size,
.format_modifier = fb->modifier,
.format_modifier = modifier,
};
desc->layers[0].planes[i] = (AVDRMPlaneDescriptor) {
.object_index = obj,
@ -557,15 +561,18 @@ static av_cold int kmsgrab_read_header(AVFormatContext *avctx)
err = AVERROR(EINVAL);
goto fail;
}
if (ctx->drm_format_modifier != DRM_FORMAT_MOD_INVALID &&
ctx->drm_format_modifier != fb2->modifier) {
av_log(avctx, AV_LOG_ERROR, "Framebuffer format modifier "
"%"PRIx64" does not match expected modifier.\n",
fb2->modifier);
err = AVERROR(EINVAL);
goto fail;
} else {
ctx->drm_format_modifier = fb2->modifier;
if (fb2->flags & DRM_MODE_FB_MODIFIERS) {
if (ctx->drm_format_modifier != DRM_FORMAT_MOD_INVALID &&
ctx->drm_format_modifier != fb2->modifier) {
av_log(avctx, AV_LOG_ERROR, "Framebuffer format modifier "
"%"PRIx64" does not match expected modifier.\n",
fb2->modifier);
err = AVERROR(EINVAL);
goto fail;
} else {
ctx->drm_format_modifier = fb2->modifier;
}
}
av_log(avctx, AV_LOG_VERBOSE, "Format is %s, from "
"DRM format %"PRIx32" modifier %"PRIx64".\n",