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h264 decoder: Implement reset() for faster flush

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Implement a custom reset() function for faster flushes
that just clear the reference pictures but don't reallocate
the DPB or clear out SPS/PPS

https://bugzilla.gnome.org/show_bug.cgi?id=781142
This commit is contained in:
Jan Schmidt 2017-04-08 01:21:23 +10:00
parent a7a9b33ad9
commit bae56fe0c2
1 changed files with 32 additions and 0 deletions
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32
gst-libs/gst/vaapi/gstvaapidecoder_h264.c
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@ -1258,6 +1258,37 @@ gst_vaapi_decoder_h264_create (GstVaapiDecoder * base_decoder)
return TRUE;
}
/* Limited reset can just needs to get the decoder
* ready to process fresh data after a flush.
* Preserves the existing DPB allocation and any SPS/PPS */
static GstVaapiDecoderStatus
gst_vaapi_decoder_h264_reset (GstVaapiDecoder * base_decoder)
{
GstVaapiDecoderH264 *const decoder =
GST_VAAPI_DECODER_H264_CAST (base_decoder);
GstVaapiDecoderH264Private *const priv = &decoder->priv;
gst_vaapi_decoder_h264_close (decoder);
priv->is_opened = FALSE;
priv->dpb_size = 0;
g_free (priv->prev_ref_frames);
priv->prev_ref_frames = NULL;
g_free (priv->prev_frames);
priv->prev_frames = NULL;
priv->prev_frames_alloc = 0;
priv->profile = GST_VAAPI_PROFILE_UNKNOWN;
priv->entrypoint = GST_VAAPI_ENTRYPOINT_VLD;
priv->chroma_type = GST_VAAPI_CHROMA_TYPE_YUV420;
priv->prev_pic_structure = GST_VAAPI_PICTURE_STRUCTURE_FRAME;
priv->progressive_sequence = TRUE;
priv->top_field_first = FALSE;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
/* Activates the supplied PPS */
static GstH264PPS *
ensure_pps (GstVaapiDecoderH264 * decoder, GstH264PPS * pps)
@ -4658,6 +4689,7 @@ gst_vaapi_decoder_h264_class_init (GstVaapiDecoderH264Class * klass)
decoder_class->create = gst_vaapi_decoder_h264_create;
decoder_class->destroy = gst_vaapi_decoder_h264_destroy;
decoder_class->reset = gst_vaapi_decoder_h264_reset;
decoder_class->parse = gst_vaapi_decoder_h264_parse;
decoder_class->decode = gst_vaapi_decoder_h264_decode;
decoder_class->start_frame = gst_vaapi_decoder_h264_start_frame;