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decoder: h264: reduce ReferenceFrames entries to the essential set.

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When decoding Multiview High profile streams with a large number of
views, it is not possible to make the VAPictureParameterBufferH264.
ReferenceFrames[] array hold the complete DPB, with all possibly
active pictures to be used for inter-view prediction in the current
access unit.

So reduce the scope of the ReferenceFrames[] array to only include
the set of reference pictures that are going to be used for decoding
the current picture. Basically, this is a union of all RefPicListX[]
array, for all slices constituting the decoded picture.
This commit is contained in:
Gwenole Beauchesne 2014-06-03 17:36:38 +02:00
parent e670e36007
commit 60af04901f
1 changed files with 41 additions and 1 deletions
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42
gst-libs/gst/vaapi/gstvaapidecoder_h264.c
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@ -2051,6 +2051,45 @@ find_inter_view_reference(GstVaapiDecoderH264 *decoder, guint16 view_id)
return NULL;
}
/* Checks whether the view id exists in the supplied list of view ids */
static gboolean
find_view_id(guint16 view_id, const guint16 *view_ids, guint num_view_ids)
{
guint i;
for (i = 0; i < num_view_ids; i++) {
if (view_ids[i] == view_id)
return TRUE;
}
return FALSE;
}
/* Checks whether the inter-view reference picture with the supplied
view id is used for decoding the current view component picture */
static gboolean
is_inter_view_reference_for_picture(GstVaapiDecoderH264 *decoder,
guint16 view_id, GstVaapiPictureH264 *picture)
{
const GstH264SPS * const sps = get_sps(decoder);
const GstH264SPSExtMVCView *view;
if (!GST_VAAPI_PICTURE_IS_MVC(picture) ||
sps->extension_type != GST_H264_NAL_EXTENSION_MVC)
return FALSE;
view = &sps->extension.mvc.view[picture->base.voc];
if (GST_VAAPI_PICTURE_IS_ANCHOR(picture))
return (find_view_id(view_id, view->anchor_ref_l0,
view->num_anchor_refs_l0) ||
find_view_id(view_id, view->anchor_ref_l1,
view->num_anchor_refs_l1));
return (find_view_id(view_id, view->non_anchor_ref_l0,
view->num_non_anchor_refs_l0) ||
find_view_id(view_id, view->non_anchor_ref_l1,
view->num_non_anchor_refs_l1));
}
/* H.8.2.1 - Initialization process for inter-view prediction references */
static void
init_picture_refs_mvc_1(GstVaapiDecoderH264 *decoder,
@ -3147,7 +3186,8 @@ fill_picture(GstVaapiDecoderH264 *decoder, GstVaapiPictureH264 *picture)
GstVaapiFrameStore * const fs = priv->dpb[i];
if ((gst_vaapi_frame_store_has_reference(fs) &&
fs->view_id == picture->base.view_id) ||
gst_vaapi_frame_store_has_inter_view(fs))
(gst_vaapi_frame_store_has_inter_view(fs) &&
is_inter_view_reference_for_picture(decoder, fs->view_id, picture)))
vaapi_fill_picture(&pic_param->ReferenceFrames[n++],
fs->buffers[0], fs->structure);
if (n >= G_N_ELEMENTS(pic_param->ReferenceFrames))