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va: h264dec: set latency

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The min latency is calculated with the maximum number of frames that
precede any frame, if available, and it is lower than the maximum
number of frames in DBP.

The max latency is calculated with the maxium size of frames in DBP.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1500>
This commit is contained in:
Víctor Manuel Jáquez Leal 2020-08-08 19:59:33 +02:00 committed by GStreamer Merge Bot
parent 76c171509e
commit 3aedef4c86
1 changed files with 35 additions and 0 deletions
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35
sys/va/gstvah264dec.c
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@ -677,6 +677,39 @@ _format_changed (GstVaH264Dec * self, VAProfile new_profile, guint new_rtformat,
&& width == new_width && height == new_height);
}
static void
_set_latency (GstVaH264Dec * self, const GstH264SPS * sps)
{
GstClockTime duration, min, max;
gint fps_d, fps_n;
guint32 num_reorder_frames;
fps_d = self->output_state->info.fps_d;
fps_n = self->output_state->info.fps_n;
/* if 0/1 then 25/1 */
if (fps_n == 0) {
fps_n = 25;
fps_d = 1;
}
num_reorder_frames = 1;
if (sps->vui_parameters_present_flag
&& sps->vui_parameters.bitstream_restriction_flag)
num_reorder_frames = sps->vui_parameters.num_reorder_frames;
if (num_reorder_frames > self->dpb_size)
num_reorder_frames = 1;
duration = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
min = num_reorder_frames * duration;
max = self->dpb_size * duration;
GST_LOG_OBJECT (self,
"latency min %" G_GUINT64_FORMAT " max %" G_GUINT64_FORMAT, min, max);
gst_video_decoder_set_latency (GST_VIDEO_DECODER (self), min, max);
}
static gboolean
gst_va_h264_dec_new_sequence (GstH264Decoder * decoder, const GstH264SPS * sps,
gint max_dpb_size)
@ -739,6 +772,8 @@ gst_va_h264_dec_new_sequence (GstH264Decoder * decoder, const GstH264SPS * sps,
GST_ERROR_OBJECT (self, "Failed to negotiate with downstream");
return FALSE;
}
_set_latency (self, sps);
}
return TRUE;