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decoder: h264: handle access unit ("au") optimization.

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Optimize parsing when buffers are supplied with access unit alignment.
This helps determining faster when the end of an access unit is reached.
This commit is contained in:
Gwenole Beauchesne 2014-06-13 15:42:53 +02:00
parent 850d3d6a4d
commit 8ed129b8bd
1 changed files with 12 additions and 1 deletions
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13
gst-libs/gst/vaapi/gstvaapidecoder_h264.c
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@ -3879,6 +3879,7 @@ gst_vaapi_decoder_h264_parse(GstVaapiDecoder *base_decoder,
guint i, size, buf_size, nalu_size, flags;
guint32 start_code;
gint ofs, ofs2;
gboolean at_au_end = FALSE;
status = ensure_decoder(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
@ -3886,6 +3887,7 @@ gst_vaapi_decoder_h264_parse(GstVaapiDecoder *base_decoder,
switch (priv->stream_alignment) {
case GST_VAAPI_STREAM_ALIGN_H264_NALU:
case GST_VAAPI_STREAM_ALIGN_H264_AU:
size = gst_adapter_available_fast(adapter);
break;
default:
@ -3908,6 +3910,8 @@ gst_vaapi_decoder_h264_parse(GstVaapiDecoder *base_decoder,
buf_size = priv->nal_length_size + nalu_size;
if (size < buf_size)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
else if (priv->stream_alignment == GST_VAAPI_STREAM_ALIGN_H264_AU)
at_au_end = (buf_size == size);
}
else {
if (size < 4)
@ -3933,7 +3937,10 @@ gst_vaapi_decoder_h264_parse(GstVaapiDecoder *base_decoder,
scan_for_start_code(adapter, ofs2, size - ofs2, NULL);
if (ofs < 0) {
// Assume the whole NAL unit is present if end-of-stream
if (!at_eos) {
// or stream buffers aligned on access unit boundaries
if (priv->stream_alignment == GST_VAAPI_STREAM_ALIGN_H264_AU)
at_au_end = TRUE;
else if (!at_eos) {
ps->input_offset2 = size;
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
}
@ -3998,6 +4005,10 @@ gst_vaapi_decoder_h264_parse(GstVaapiDecoder *base_decoder,
return status;
flags = 0;
if (at_au_end) {
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_END |
GST_VAAPI_DECODER_UNIT_FLAG_AU_END;
}
switch (pi->nalu.type) {
case GST_H264_NAL_AU_DELIMITER:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_AU_START;