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libs: encoder: h265: add low delay B frame support.

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Low delay B frame provide the function of transforming
P frame into low delay B frame which frame type is B, but
only reference predictive frames. This can be used when P
frame unsupported. Especially for P and B both unsupported,
in this case, I and low delay B frame can be encoded in a
stream.

https://bugzilla.gnome.org/show_bug.cgi?id=796984
This commit is contained in:
Wangfei 2018-08-30 11:08:07 +08:00 committed by Víctor Manuel Jáquez Leal
parent 2922439bc2
commit 2fce126cc7
2 changed files with 29 additions and 0 deletions
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27
gst-libs/gst/vaapi/gstvaapiencoder_h265.c
View file

@ -110,6 +110,7 @@ struct _GstVaapiEncoderH265
guint32 luma_height;
GstClockTime cts_offset;
gboolean config_changed;
gboolean low_delay_b;
/* maximum required size of the decoded picture buffer */
guint32 max_dec_pic_buffering;
@ -1684,6 +1685,9 @@ add_slice_headers (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture,
}
slice_param->num_ctu_in_slice = cur_slice_ctus;
slice_param->slice_type = h265_get_slice_type (picture->type);
if (encoder->low_delay_b && slice_param->slice_type == GST_H265_P_SLICE) {
slice_param->slice_type = GST_H265_B_SLICE;
}
slice_param->slice_pic_parameter_set_id = 0;
slice_param->slice_fields.bits.num_ref_idx_active_override_flag =
@ -1717,6 +1721,13 @@ add_slice_headers (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture,
GST_VAAPI_SURFACE_PROXY_SURFACE_ID (reflist_1[i_ref]->pic);
slice_param->ref_pic_list1[i_ref].pic_order_cnt = reflist_1[i_ref]->poc;
}
} else if (picture->type == GST_VAAPI_PICTURE_TYPE_P
&& encoder->low_delay_b) {
for (; i_ref < reflist_0_count; ++i_ref) {
slice_param->ref_pic_list1[i_ref].picture_id =
GST_VAAPI_SURFACE_PROXY_SURFACE_ID (reflist_0[i_ref]->pic);
slice_param->ref_pic_list1[i_ref].pic_order_cnt = reflist_0[i_ref]->poc;
}
}
for (; i_ref < G_N_ELEMENTS (slice_param->ref_pic_list1); ++i_ref) {
slice_param->ref_pic_list1[i_ref].picture_id = VA_INVALID_SURFACE;
@ -2583,6 +2594,10 @@ gst_vaapi_encoder_h265_set_property (GstVaapiEncoder * base_encoder,
case GST_VAAPI_ENCODER_H265_PROP_MBBRC:
encoder->mbbrc = g_value_get_enum (value);
break;
case GST_VAAPI_ENCODER_H265_PROP_LOW_DELAY_B:
encoder->low_delay_b = g_value_get_boolean (value);
break;
default:
return GST_VAAPI_ENCODER_STATUS_ERROR_INVALID_PARAMETER;
}
@ -2748,6 +2763,18 @@ gst_vaapi_encoder_h265_get_default_properties (void)
GST_VAAPI_TYPE_ENCODER_MBBRC, GST_VAAPI_ENCODER_MBBRC_AUTO,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstVaapiEncoderH265:low_delay_b:
*
* Enable low delay b frame, which will change P frame with B frame.
*/
GST_VAAPI_ENCODER_PROPERTIES_APPEND (props,
GST_VAAPI_ENCODER_H265_PROP_LOW_DELAY_B,
g_param_spec_boolean ("low-delay-b",
"Enable low delay b",
"Transforms P frames into predictive B frames. Enable it when P frames are not supported.",
FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
return props;
}

2
gst-libs/gst/vaapi/gstvaapiencoder_h265.h
View file

@ -45,6 +45,7 @@ typedef struct _GstVaapiEncoderH265 GstVaapiEncoderH265;
* @GST_VAAPI_ENCODER_H265_PROP_MBBRC: Macroblock level Bitrate Control.
* @GST_VAAPI_ENCODER_H265_PROP_QP_IP: Difference of QP between I and P frame.
* @GST_VAAPI_ENCODER_H265_PROP_QP_IB: Difference of QP between I and B frame.
* @GST_VAAPI_ENCODER_H265_PROP_LOW_DELAY_B: use low delay b feature.
* in milliseconds (uint).
*
* The set of H.265 encoder specific configurable properties.
@ -59,6 +60,7 @@ typedef enum {
GST_VAAPI_ENCODER_H265_PROP_MBBRC = -8,
GST_VAAPI_ENCODER_H265_PROP_QP_IP = -9,
GST_VAAPI_ENCODER_H265_PROP_QP_IB = -10,
GST_VAAPI_ENCODER_H265_PROP_LOW_DELAY_B = -11,
} GstVaapiEncoderH265Prop;
GstVaapiEncoder *