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codecs: h264dec: Improve the fast bump for the live mode.

Browse source 
We control the policy of fast bump by the profile and the compliance
property. For baseline and constrained baseline profiles, we can use
more radical bump policy. User can also change the bump policy by
setting the compliance property in run time.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2432>
This commit is contained in:
He Junyan 2021-07-28 23:19:15 +08:00 committed by Víctor Manuel Jáquez Leal
parent 56269d127f
commit 0b949ec07c
1 changed files with 39 additions and 2 deletions
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41
gst-libs/gst/codecs/gsth264decoder.c
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@ -82,6 +82,7 @@ struct _GstH264DecoderPrivate
{
GstH264DecoderCompliance compliance;
guint8 profile_idc;
gint width, height;
/* input codec_data, if any */
@ -408,6 +409,7 @@ gst_h264_decoder_reset (GstH264Decoder * self)
g_clear_pointer (&priv->dpb, gst_h264_dpb_free);
gst_h264_picture_clear (&priv->last_field);
priv->profile_idc = 0;
priv->width = 0;
priv->height = 0;
priv->nal_length_size = 4;
@ -962,7 +964,8 @@ gst_h264_decoder_handle_frame_num_gap (GstH264Decoder * self, gint frame_num)
gst_h264_dpb_delete_unused (priv->dpb);
while (gst_h264_dpb_needs_bump (priv->dpb, picture, FALSE)) {
while (gst_h264_dpb_needs_bump (priv->dpb, picture,
GST_H264_DPB_BUMP_NORMAL_LATENCY)) {
GstH264Picture *to_output;
to_output = gst_h264_dpb_bump (priv->dpb, FALSE);
@ -2010,6 +2013,37 @@ gst_h264_decoder_reference_picture_marking (GstH264Decoder * self,
return gst_h264_decoder_sliding_window_picture_marking (self, picture);
}
static GstH264DpbBumpMode
get_bump_level (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
/* User set the mode explicitly. */
switch (priv->compliance) {
case GST_H264_DECODER_COMPLIANCE_STRICT:
return GST_H264_DPB_BUMP_NORMAL_LATENCY;
case GST_H264_DECODER_COMPLIANCE_NORMAL:
return GST_H264_DPB_BUMP_LOW_LATENCY;
case GST_H264_DECODER_COMPLIANCE_FLEXIBLE:
return GST_H264_DPB_BUMP_VERY_LOW_LATENCY;
default:
break;
}
/* GST_H264_DECODER_COMPLIANCE_AUTO case. */
if (priv->is_live) {
/* The baseline and constrained-baseline profiles do not have B frames
and do not use the picture reorder, safe to use the higher bump level. */
if (priv->profile_idc == GST_H264_PROFILE_BASELINE)
return GST_H264_DPB_BUMP_VERY_LOW_LATENCY;
return GST_H264_DPB_BUMP_LOW_LATENCY;
}
return GST_H264_DPB_BUMP_NORMAL_LATENCY;
}
static gboolean
gst_h264_decoder_finish_picture (GstH264Decoder * self,
GstH264Picture * picture)
@ -2017,6 +2051,7 @@ gst_h264_decoder_finish_picture (GstH264Decoder * self,
GstVideoDecoder *decoder = GST_VIDEO_DECODER (self);
GstH264DecoderPrivate *priv = self->priv;
gboolean ret = TRUE;
GstH264DpbBumpMode bump_level;
/* Finish processing the picture.
* Start by storing previous picture data for later use */
@ -2056,7 +2091,8 @@ gst_h264_decoder_finish_picture (GstH264Decoder * self,
gst_h264_decoder_drain_internal (self);
}
while (gst_h264_dpb_needs_bump (priv->dpb, picture, priv->is_live)) {
bump_level = get_bump_level (self);
while (gst_h264_dpb_needs_bump (priv->dpb, picture, bump_level)) {
GstH264Picture *to_output;
to_output = gst_h264_dpb_bump (priv->dpb, FALSE);
@ -2392,6 +2428,7 @@ gst_h264_decoder_process_sps (GstH264Decoder * self, GstH264SPS * sps)
return FALSE;
}
priv->profile_idc = sps->profile_idc;
priv->width = sps->width;
priv->height = sps->height;