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codecs: h264decoder: Calculate and set latency

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Add gst_h264_decoder_set_latency(), which calculates and sets
latency on base decoder class, after new_sequence is called.

This assumes that in new_sequence() vmethod, callee negotiates
downstream caps.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1531>
This commit is contained in:
Víctor Manuel Jáquez Leal 2020-08-22 12:44:16 +02:00 committed by Nicolas Dufresne
parent 261d6e463a
commit e0e37a0d92
1 changed files with 47 additions and 0 deletions
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47
gst-libs/gst/codecs/gsth264decoder.c
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@ -1884,6 +1884,52 @@ h264_level_to_max_dpb_mbs (GstH264DecoderLevel level)
return 0;
}
static void
gst_h264_decoder_set_latency (GstH264Decoder * self, const GstH264SPS * sps,
gint max_dpb_size)
{
GstH264DecoderPrivate *priv = self->priv;
GstCaps *caps;
GstClockTime min, max;
GstStructure *structure;
gint fps_d = 1, fps_n = 0;
guint32 num_reorder_frames;
caps = gst_pad_get_current_caps (GST_VIDEO_DECODER_SRC_PAD (self));
if (!caps)
return;
structure = gst_caps_get_structure (caps, 0);
if (gst_structure_get_fraction (structure, "framerate", &fps_n, &fps_d)) {
if (fps_n == 0) {
/* variable framerate: see if we have a max-framerate */
gst_structure_get_fraction (structure, "max-framerate", &fps_n, &fps_d);
}
}
/* if no fps or variable, then 25/1 */
if (fps_n == 0) {
fps_n = 25;
fps_d = 1;
}
num_reorder_frames = priv->is_live ? 0 : 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 > max_dpb_size)
num_reorder_frames = priv->is_live ? 0 : 1;
min = gst_util_uint64_scale_int (num_reorder_frames * GST_SECOND, fps_d,
fps_n);
max = gst_util_uint64_scale_int (max_dpb_size * GST_SECOND, fps_d, fps_n);
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_h264_decoder_process_sps (GstH264Decoder * self, GstH264SPS * sps)
{
@ -1964,6 +2010,7 @@ gst_h264_decoder_process_sps (GstH264Decoder * self, GstH264SPS * sps)
priv->width = sps->width;
priv->height = sps->height;
gst_h264_decoder_set_latency (self, sps, max_dpb_size);
gst_h264_dpb_set_max_num_pics (priv->dpb, max_dpb_size);
}