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h264: optimize scan for the second start code.

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Optimize scan for the second start code, on the next parse() call so that
to avoid scanning again earlier bytes where we didn't find any start code.
This commit is contained in:
Gwenole Beauchesne 2012-12-12 18:33:52 +01:00
parent 63c455d28d
commit f7f7393148
1 changed files with 18 additions and 6 deletions
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24
gst-libs/gst/vaapi/gstvaapidecoder_h264.c
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@ -2982,13 +2982,14 @@ gst_vaapi_decoder_h264_parse(GstVaapiDecoder *base_decoder,
{
GstVaapiDecoderH264 * const decoder = GST_VAAPI_DECODER_H264(base_decoder);
GstVaapiDecoderH264Private * const priv = decoder->priv;
GstVaapiParserState * const ps = GST_VAAPI_PARSER_STATE(base_decoder);
GstVaapiDecoderUnitH264 *unit;
GstVaapiDecoderStatus status;
GstH264ParserResult result;
guchar *buf;
guint i, size, buf_size, nalu_size, flags;
guint32 start_code;
gint ofs;
gint ofs, ofs2;
status = ensure_decoder(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
@ -3015,22 +3016,33 @@ gst_vaapi_decoder_h264_parse(GstVaapiDecoder *base_decoder,
else {
if (size < 4)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
ofs = scan_for_start_code(adapter, 0, size, NULL);
if (ofs < 0)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
gst_adapter_flush(adapter, ofs);
size -= ofs;
ofs = G_UNLIKELY(size < 8) ? -1 :
scan_for_start_code(adapter, 4, size - 4, NULL);
if (ofs > 0) {
gst_adapter_flush(adapter, ofs);
size -= ofs;
}
ofs2 = ps->input_offset2 - ofs - 4;
if (ofs2 < 4)
ofs2 = 4;
ofs = G_UNLIKELY(size < ofs2 + 4) ? -1 :
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)
if (!at_eos) {
ps->input_offset2 = size;
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
}
ofs = size;
}
buf_size = ofs;
}
ps->input_offset2 = 0;
buf = (guchar *)gst_adapter_peek(adapter, buf_size);
if (!buf)