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decoder: h264: add initial support for loss of pictures.

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Implement decoding process for gaps in frame_num (8.5.2). This
also somewhat supports unintentional loss of pictures.

https://bugzilla.gnome.org/show_bug.cgi?id=745048
https://bugzilla.gnome.org/show_bug.cgi?id=703921

Original-patch-by: Wind Yuan <feng.yuan@intel.com>
[fixed derivation of POC, ensured clone is valid for reference,
 actually fixed detection of gaps in FrameNum by PrevRefFrameNum]
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
This commit is contained in:
Gwenole Beauchesne 2015-03-12 22:57:22 +01:00
parent 8dd93e9c8a
commit 5abd2b90b6
1 changed files with 139 additions and 1 deletions
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140
gst-libs/gst/vaapi/gstvaapidecoder_h264.c
View file

@ -517,7 +517,9 @@ struct _GstVaapiDecoderH264Private {
gint32 frame_num_offset; // FrameNumOffset
gint32 frame_num; // frame_num (from slice_header())
gint32 prev_frame_num; // prevFrameNum
gint32 prev_ref_frame_num; // prevRefFrameNum
gboolean prev_pic_has_mmco5; // prevMmco5Pic
gboolean prev_pic_reference; // previous picture is a reference
guint prev_pic_structure; // previous picture structure
guint is_opened : 1;
guint is_avcC : 1;
@ -805,6 +807,29 @@ dpb_find_nearest_prev_poc(GstVaapiDecoderH264 *decoder,
return found_picture ? found_index : -1;
}
/* Finds the picture with the associated FrameNum */
static gint
dpb_find_frame_num(GstVaapiDecoderH264 *decoder, GstVaapiPictureH264 *picture,
gint frame_num, GstVaapiPictureH264 **found_picture_ptr)
{
GstVaapiDecoderH264Private * const priv = &decoder->priv;
guint i, j;
for (i = 0; i < priv->dpb_count; i++) {
GstVaapiFrameStore * const fs = priv->dpb[i];
if (picture && picture->base.view_id != fs->view_id)
continue;
for (j = 0; j < fs->num_buffers; j++) {
if (fs->buffers[j]->frame_num != frame_num)
continue;
if (found_picture_ptr)
*found_picture_ptr = fs->buffers[j];
return i;
}
}
return -1;
}
/* Finds the picture with the lowest POC that needs to be output */
static gint
dpb_find_lowest_poc(GstVaapiDecoderH264 *decoder, GstVaapiPictureH264 *picture,
@ -3083,6 +3108,114 @@ error_append_field:
return NULL;
}
static gboolean
fill_picture_gaps(GstVaapiDecoderH264 *decoder, GstVaapiPictureH264 *picture,
GstH264SliceHdr *slice_hdr)
{
GstVaapiDecoderH264Private * const priv = &decoder->priv;
GstH264SPS * const sps = get_sps(decoder);
const gint32 MaxFrameNum = 1 << (sps->log2_max_frame_num_minus4 + 4);
GstVaapiPicture *base_picture;
GstVaapiPictureH264 *lost_picture, *prev_picture;
GstH264SliceHdr lost_slice_hdr;
gboolean success = FALSE;
if (priv->prev_ref_frame_num == priv->frame_num)
return TRUE;
if ((priv->prev_ref_frame_num + 1) % MaxFrameNum == priv->frame_num)
return TRUE;
if (priv->dpb_count == 0)
return TRUE;
prev_picture = NULL;
dpb_find_frame_num(decoder, picture, priv->prev_ref_frame_num,
&prev_picture);
if (prev_picture)
gst_vaapi_picture_ref(prev_picture);
gst_vaapi_picture_ref(picture);
lost_slice_hdr = *slice_hdr;
lost_slice_hdr.field_pic_flag = 0;
if (sps->pic_order_cnt_type == 1) {
lost_slice_hdr.delta_pic_order_cnt[0] = 0;
lost_slice_hdr.delta_pic_order_cnt[1] = 0;
}
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;
for (;;) {
priv->prev_ref_frame_num = priv->frame_num;
priv->frame_num = (priv->prev_ref_frame_num + 1) % MaxFrameNum;
if (priv->frame_num == slice_hdr->frame_num)
break;
/* Create new picture */
if (prev_picture)
lost_picture = gst_vaapi_picture_h264_new_clone(prev_picture);
else
lost_picture = gst_vaapi_picture_h264_new(decoder);
if (!lost_picture)
goto error_allocate_picture;
base_picture = &lost_picture->base;
base_picture->type = GST_VAAPI_PICTURE_TYPE_NONE;
base_picture->pts = GST_CLOCK_TIME_NONE;
base_picture->structure = GST_VAAPI_PICTURE_STRUCTURE_FRAME;
lost_picture->frame_num = priv->frame_num;
lost_picture->frame_num_wrap = priv->frame_num;
lost_picture->structure = base_picture->structure;
GST_VAAPI_PICTURE_FLAG_SET(lost_picture,
(GST_VAAPI_PICTURE_FLAG_SKIPPED |
GST_VAAPI_PICTURE_FLAG_GHOST |
GST_VAAPI_PICTURE_FLAG_SHORT_TERM_REFERENCE));
if (sps->pic_order_cnt_type != 0)
init_picture_poc(decoder, lost_picture, &lost_slice_hdr);
else {
base_picture->poc = prev_picture->base.poc + 2;
if (prev_picture->field_poc[0] != G_MAXINT32)
lost_picture->field_poc[0] = prev_picture->field_poc[0] + 2;
if (prev_picture->field_poc[1] != G_MAXINT32)
lost_picture->field_poc[1] = prev_picture->field_poc[1] + 2;
}
gst_vaapi_picture_replace(&prev_picture, lost_picture);
gst_vaapi_picture_replace(&priv->current_picture, lost_picture);
gst_vaapi_picture_unref(lost_picture);
init_picture_ref_lists(decoder, lost_picture);
init_picture_refs_pic_num(decoder, lost_picture, &lost_slice_hdr);
if (!exec_ref_pic_marking_sliding_window(decoder))
goto error_exec_ref_pic_marking;
if (!dpb_add(decoder, lost_picture))
goto error_dpb_add;
gst_vaapi_picture_replace(&priv->current_picture, NULL);
}
success = TRUE;
cleanup:
priv->frame_num = slice_hdr->frame_num;
priv->prev_ref_frame_num = (priv->frame_num + MaxFrameNum - 1) % MaxFrameNum;
gst_vaapi_picture_replace(&prev_picture, NULL);
gst_vaapi_picture_replace(&priv->current_picture, picture);
gst_vaapi_picture_unref(picture);
return success;
/* ERRORS */
error_allocate_picture:
GST_ERROR("failed to allocate lost picture");
goto cleanup;
error_exec_ref_pic_marking:
GST_ERROR("failed to execute reference picture marking process");
goto cleanup;
error_dpb_add:
GST_ERROR("failed to store lost picture into the DPB");
goto cleanup;
}
static gboolean
init_picture(
GstVaapiDecoderH264 *decoder,
@ -3092,6 +3225,8 @@ init_picture(
GstVaapiPicture * const base_picture = &picture->base;
GstH264SliceHdr * const slice_hdr = &pi->data.slice_hdr;
if (priv->prev_pic_reference)
priv->prev_ref_frame_num = priv->frame_num;
priv->prev_frame_num = priv->frame_num;
priv->frame_num = slice_hdr->frame_num;
picture->frame_num = priv->frame_num;
@ -3124,6 +3259,8 @@ init_picture(
GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_IDR);
dpb_flush(decoder, picture);
}
else if (!fill_picture_gaps(decoder, picture, slice_hdr))
return FALSE;
/* Initialize picture structure */
if (slice_hdr->field_pic_flag) {
@ -3457,13 +3594,14 @@ exec_ref_pic_marking(GstVaapiDecoderH264 *decoder, GstVaapiPictureH264 *picture)
{
GstVaapiDecoderH264Private * const priv = &decoder->priv;
priv->prev_pic_reference = GST_VAAPI_PICTURE_IS_REFERENCE(picture);
priv->prev_pic_has_mmco5 = FALSE;
priv->prev_pic_structure = picture->structure;
if (GST_VAAPI_PICTURE_IS_INTER_VIEW(picture))
g_ptr_array_add(priv->inter_views, gst_vaapi_picture_ref(picture));
if (!GST_VAAPI_PICTURE_IS_REFERENCE(picture))
if (!priv->prev_pic_reference)
return TRUE;
if (!GST_VAAPI_PICTURE_IS_IDR(picture)) {