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v4l2codecs: h264: Fix split field handling

Browse source 
Split fields ends up on multiple picture and requires accessing the
other_field to complete the information (POC).

This also cleanup the DPB from non-reference (was not useful) and skips
properly merge field instead of keeping them duplicated. This fixes most
of interlace decoding seen in fluster.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2474>
This commit is contained in:
Nicolas Dufresne 2021-08-19 16:45:18 -04:00 committed by GStreamer Marge Bot
parent ad5dcfb091
commit 4eb22b7695
1 changed files with 94 additions and 35 deletions
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129
sys/v4l2codecs/gstv4l2codech264dec.c
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@ -530,13 +530,11 @@ gst_v4l2_codec_h264_dec_fill_decoder_params (GstV4l2CodecH264Dec * self,
GstH264SliceHdr * slice_hdr, GstH264Picture * picture, GstH264Dpb * dpb)
{
GArray *refs = gst_h264_dpb_get_pictures_all (dpb);
gint i;
gint i, entry_id = 0;
/* *INDENT-OFF* */
self->decode_params = (struct v4l2_ctrl_h264_decode_params) {
.nal_ref_idc = picture->nal_ref_idc,
.top_field_order_cnt = picture->top_field_order_cnt,
.bottom_field_order_cnt = picture->bottom_field_order_cnt,
.frame_num = slice_hdr->frame_num,
.idr_pic_id = slice_hdr->idr_pic_id,
.pic_order_cnt_lsb = slice_hdr->pic_order_cnt_lsb,
@ -551,28 +549,38 @@ gst_v4l2_codec_h264_dec_fill_decoder_params (GstV4l2CodecH264Dec * self,
(slice_hdr->bottom_field_flag ? V4L2_H264_DECODE_PARAM_FLAG_BOTTOM_FIELD : 0),
};
switch (picture->field) {
case GST_H264_PICTURE_FIELD_FRAME:
self->decode_params.top_field_order_cnt = picture->top_field_order_cnt;
self->decode_params.bottom_field_order_cnt =
picture->bottom_field_order_cnt;
break;
case GST_H264_PICTURE_FIELD_TOP_FIELD:
self->decode_params.top_field_order_cnt = picture->top_field_order_cnt;
self->decode_params.bottom_field_order_cnt = 0;
break;
case GST_H264_PICTURE_FIELD_BOTTOM_FIELD:
self->decode_params.top_field_order_cnt = 0;
self->decode_params.bottom_field_order_cnt =
picture->bottom_field_order_cnt;
break;
}
for (i = 0; i < refs->len; i++) {
GstH264Picture *ref_pic = g_array_index (refs, GstH264Picture *, i);
gint pic_num = ref_pic->pic_num;
guchar dpb_ref = 0;
struct v4l2_h264_dpb_entry *entry;
/* Unwrap pic_num */
if (pic_num < 0)
pic_num += slice_hdr->max_pic_num;
/* Skip non-reference as they are not useful to decoding */
if (!GST_H264_PICTURE_IS_REF (ref_pic))
continue;
switch (ref_pic->field) {
case GST_H264_PICTURE_FIELD_FRAME:
dpb_ref = V4L2_H264_FRAME_REF;
break;
case GST_H264_PICTURE_FIELD_TOP_FIELD:
dpb_ref = V4L2_H264_TOP_FIELD_REF;
break;
case GST_H264_PICTURE_FIELD_BOTTOM_FIELD:
dpb_ref = V4L2_H264_BOTTOM_FIELD_REF;
break;
}
/* The second field picture will be handled differently */
if (ref_pic->second_field)
continue;
self->decode_params.dpb[i] = (struct v4l2_h264_dpb_entry) {
entry = &self->decode_params.dpb[entry_id++];
*entry = (struct v4l2_h264_dpb_entry) {
/*
* The reference is multiplied by 1000 because it's wassed as micro
* seconds and this TS is nanosecond.
@ -580,15 +588,42 @@ gst_v4l2_codec_h264_dec_fill_decoder_params (GstV4l2CodecH264Dec * self,
.reference_ts = (guint64) ref_pic->system_frame_number * 1000,
.frame_num = ref_pic->frame_num,
.pic_num = pic_num,
.top_field_order_cnt = ref_pic->pic_order_cnt,
.bottom_field_order_cnt = ref_pic->bottom_field_order_cnt,
.flags = V4L2_H264_DPB_ENTRY_FLAG_VALID
| (GST_H264_PICTURE_IS_REF (ref_pic) ?
V4L2_H264_DPB_ENTRY_FLAG_ACTIVE : 0)
| (GST_H264_PICTURE_IS_LONG_TERM_REF (ref_pic) ?
V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM : 0),
.fields = dpb_ref,
| (GST_H264_PICTURE_IS_REF (ref_pic) ? V4L2_H264_DPB_ENTRY_FLAG_ACTIVE : 0)
| (GST_H264_PICTURE_IS_LONG_TERM_REF (ref_pic) ? V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM : 0),
};
switch (ref_pic->field) {
case GST_H264_PICTURE_FIELD_FRAME:
entry->top_field_order_cnt = ref_pic->top_field_order_cnt;
entry->bottom_field_order_cnt = ref_pic->bottom_field_order_cnt;
entry->fields = V4L2_H264_FRAME_REF;
break;
case GST_H264_PICTURE_FIELD_TOP_FIELD:
entry->top_field_order_cnt = ref_pic->top_field_order_cnt;
entry->fields = V4L2_H264_TOP_FIELD_REF;
if (ref_pic->other_field) {
entry->bottom_field_order_cnt =
ref_pic->other_field->bottom_field_order_cnt;
entry->fields |= V4L2_H264_BOTTOM_FIELD_REF;
} else {
entry->flags |= V4L2_H264_DPB_ENTRY_FLAG_FIELD;
}
break;
case GST_H264_PICTURE_FIELD_BOTTOM_FIELD:
entry->bottom_field_order_cnt = ref_pic->bottom_field_order_cnt;
entry->fields = V4L2_H264_BOTTOM_FIELD_REF;
if (ref_pic->other_field) {
entry->top_field_order_cnt =
ref_pic->other_field->top_field_order_cnt;
entry->fields |= V4L2_H264_TOP_FIELD_REF;
} else {
entry->flags |= V4L2_H264_DPB_ENTRY_FLAG_FIELD;
}
break;
}
}
/* *INDENT-ON* */
@ -704,6 +739,10 @@ lookup_dpb_index (struct v4l2_h264_dpb_entry dpb[16], GstH264Picture * ref_pic)
if (!ref_pic)
return 0xff;
/* DPB entries only stores first field in a merged fashion */
if (ref_pic->second_field && ref_pic->other_field)
ref_pic = ref_pic->other_field;
ref_ts = (guint64) ref_pic->system_frame_number * 1000;
for (i = 0; i < 16; i++) {
if (dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE
@ -714,15 +753,33 @@ lookup_dpb_index (struct v4l2_h264_dpb_entry dpb[16], GstH264Picture * ref_pic)
return 0xff;
}
static guint
_get_v4l2_fields_ref (GstH264Picture * ref_pic, gboolean merge)
{
if (merge && ref_pic->other_field)
return V4L2_H264_FRAME_REF;
switch (ref_pic->field) {
case GST_H264_PICTURE_FIELD_FRAME:
return V4L2_H264_FRAME_REF;
break;
case GST_H264_PICTURE_FIELD_TOP_FIELD:
return V4L2_H264_TOP_FIELD_REF;
break;
case GST_H264_PICTURE_FIELD_BOTTOM_FIELD:
return V4L2_H264_BOTTOM_FIELD_REF;
break;
}
return V4L2_H264_FRAME_REF;
}
static void
gst_v4l2_codec_h264_dec_fill_references (GstV4l2CodecH264Dec * self,
GArray * ref_pic_list0, GArray * ref_pic_list1)
gboolean cur_is_frame, GArray * ref_pic_list0, GArray * ref_pic_list1)
{
struct v4l2_ctrl_h264_slice_params *slice_params;
gint i, fields = V4L2_H264_FRAME_REF;
if (self->interlaced)
fields = 0;
gint i;
slice_params = &g_array_index (self->slice_params,
struct v4l2_ctrl_h264_slice_params, 0);
@ -737,7 +794,8 @@ gst_v4l2_codec_h264_dec_fill_references (GstV4l2CodecH264Dec * self,
g_array_index (ref_pic_list0, GstH264Picture *, i);
slice_params->ref_pic_list0[i].index =
lookup_dpb_index (self->decode_params.dpb, ref_pic);
slice_params->ref_pic_list0[i].fields = fields;
slice_params->ref_pic_list0[i].fields =
_get_v4l2_fields_ref (ref_pic, cur_is_frame);
}
for (i = 0; i < ref_pic_list1->len; i++) {
@ -745,7 +803,8 @@ gst_v4l2_codec_h264_dec_fill_references (GstV4l2CodecH264Dec * self,
g_array_index (ref_pic_list1, GstH264Picture *, i);
slice_params->ref_pic_list1[i].index =
lookup_dpb_index (self->decode_params.dpb, ref_pic);
slice_params->ref_pic_list1[i].fields = fields;
slice_params->ref_pic_list1[i].fields =
_get_v4l2_fields_ref (ref_pic, cur_is_frame);
}
}
@ -1182,8 +1241,8 @@ gst_v4l2_codec_h264_dec_decode_slice (GstH264Decoder * decoder,
gst_v4l2_codec_h264_dec_fill_slice_params (self, slice);
gst_v4l2_codec_h264_dec_fill_pred_weight (self, &slice->header);
gst_v4l2_codec_h264_dec_fill_references (self, ref_pic_list0,
ref_pic_list1);
gst_v4l2_codec_h264_dec_fill_references (self,
GST_H264_PICTURE_IS_FRAME (picture), ref_pic_list0, ref_pic_list1);
}
bitstream_data = self->bitstream_map.data + self->bitstream_map.size;