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libs: decoder: h264: reduce frame number of gaps

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Reduce frame num gaps so that we don't have to create unnecessary
dummy pictures, just throw them away.

Signed-off-by: Víctor Manuel Jáquez Leal <victorx.jaquez@intel.com>

https://bugzilla.gnome.org/show_bug.cgi?id=777506
This commit is contained in:
Hyunjun Ko 2017-02-07 16:17:39 +09:00 committed by Víctor Manuel Jáquez Leal
parent b0016e336b
commit d89a3bd258
1 changed files with 15 additions and 2 deletions
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17
gst-libs/gst/vaapi/gstvaapidecoder_h264.c
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@ -3137,6 +3137,7 @@ fill_picture_gaps (GstVaapiDecoderH264 * decoder, GstVaapiPictureH264 * picture,
GstVaapiDecoderH264Private *const priv = &decoder->priv;
GstH264SPS *const sps = get_sps (decoder);
const gint32 MaxFrameNum = 1 << (sps->log2_max_frame_num_minus4 + 4);
gint32 prev_frame_num;
GstVaapiFrameStore *prev_frame;
GstVaapiPicture *base_picture;
GstVaapiPictureH264 *lost_picture, *prev_picture;
@ -3164,8 +3165,20 @@ fill_picture_gaps (GstVaapiDecoderH264 * decoder, GstVaapiPictureH264 * picture,
lost_slice_hdr.dec_ref_pic_marking.adaptive_ref_pic_marking_mode_flag = 0;
/* XXX: this process is incorrect for MVC */
/* XXX: optimize to reduce the number of dummy pictures created */
priv->frame_num = priv->prev_ref_frame_num;
/* Reduce frame num gaps so we don't have to create unnecessary
* dummy pictures */
prev_frame_num = priv->prev_ref_frame_num;
if (prev_frame_num > slice_hdr->frame_num)
prev_frame_num -= MaxFrameNum;
if ((slice_hdr->frame_num - prev_frame_num) - 1 > sps->num_ref_frames) {
prev_frame_num = (slice_hdr->frame_num - sps->num_ref_frames) - 1;
if (prev_frame_num < 0)
prev_frame_num += MaxFrameNum;
}
priv->frame_num = prev_frame_num;
for (;;) {
priv->prev_ref_frame_num = priv->frame_num;
priv->frame_num = (priv->prev_ref_frame_num + 1) % MaxFrameNum;