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vaapidecode: calculate decoding latency

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This is a naïve approach to the calculation of the VA-API decoding latency. It
takes into consideration when the frame-rate has some insane value.

https://bugzilla.gnome.org/show_bug.cgi?id=740419
This commit is contained in:
Víctor Manuel Jáquez Leal 2015-05-21 19:38:33 +02:00
parent dff6b7cb31
commit 26cedfa9fa
1 changed files with 16 additions and 0 deletions
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16
gst/vaapi/gstvaapidecode.c
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@ -226,6 +226,22 @@ gst_vaapidecode_update_src_caps (GstVaapiDecode * decode)
gst_caps_set_features (state->caps, 0, features);
gst_caps_replace (&decode->srcpad_caps, state->caps);
gst_video_codec_state_unref (state);
gint fps_n = GST_VIDEO_INFO_FPS_N (vi);
gint fps_d = GST_VIDEO_INFO_FPS_D (vi);
if (fps_n <= 0 || fps_d <= 0) {
GST_DEBUG_OBJECT (decode, "forcing 25/1 framerate for latency calculation");
fps_n = 1;
fps_d = 25;
}
/* For parsing/preparation purposes we'd need at least 1 frame
* latency in general, with perfectly known unit boundaries (NALU,
* AU), and up to 2 frames when we need to wait for the second frame
* start to determine the first frame is complete */
GstClockTime latency = gst_util_uint64_scale (2 * GST_SECOND, fps_d, fps_n);
gst_video_decoder_set_latency (vdec, latency, latency);
return TRUE;
}